Answer:
To find the number of milligrams (mg) in 0.750 moles of zinc, you will need to know the atomic weight of zinc. The atomic weight of zinc is 65.38 g/mol.
To convert from moles to milligrams, you will need to multiply the number of moles by the atomic weight of zinc and then multiply by 1000 to convert the weight to milligrams.
Thus, the number of milligrams in 0.750 moles of zinc is:
0.750 moles * 65.38 g/mol * 1000 mg/g = 48.7850 mg
So there are approximately 48.79 mg of zinc in 0.750 moles of the element.
Explanation:
According to the kinetic-molecular theory, what must always increase when the temperature increases?
Select one:
a. the pressure of the gas
b. the volume of the gas
c. the number of moles of gas
d. the average kinetic energy of the gas particles
e. all of the above
the answer is d
i looked this up i was confused myself but its d or e
clearly explain what the results of the ferric chloride tests indicate. were these results expected? what did the test on the aspirin you synthesized prove?
Aspirin is an effective pain reliever (i.e. analgesic), fever reducer (i.e. antipyretic) and anti-inflammatory agent and is one of the most widely used non-prescription drugs. It is synthesized by the esterification of salicylic acid with acetic anhydride in presence of little amount of an acid as a catalyst.
After completion of synthesis, to identify the presence of unreacted salicylic acid (starting material or reactant) in the crude aspirin product, the ferric chloride test is used.FeCl3(aq) solution is used to check and test the purity of the crude aspirin.
When FeCl3 solution (2 drops of FeCl3 neutral solution in 1 mL of ethanol) is added to the solution of product formed, the salicylic acid gives purple color, while the crude aspirin product and the final purified aspirin, both gives yellow color.
This is because Fe³ ion reacts with phenols (i.e. salicylic acid) to form a purple complex. Salicylic acid contains a phenol group, whereas, acetylsalicylic acid (Aspirin) does not. Thus, after the addition of FeCl3 to the crude aspirin solution, if a purple color is observed, it means that there is still some salicylic acid present unreacted and the obtained product is impure.
If only, the yellow color is observed upon addition of ferric chloride, that means there is no unreacted starting material present in the product. A minor amount may be present in the crude aspirin product, which is not in enough concentration to form a complex with the ferric chloride to generate the purple color.
After that, when the purple color does not observe, then the product only contain crude aspirin, which can be purified by recrystallization.
For this, the crude aspirin is dissolved in a small amount of warm ethanol with a known quantity of water is added and the resultant solution is allowed to cooled slowly and then chilled.
The acetylsalicylic acid will recrystallize and the solid impurities (like unreacted salicylic acid) will remain dissolved in the solution.
The crystallised solid aspirin is collected through filtration and again tested for FeCl3 purity test, which should give yellow color with iron and it should be purer than the original aspirin.
The ferric chloride purification test of aspirin crude product suggest or prove that if an unreacted starting material is there or not. If purple color is found then starting material should be removed by suitable other purification methods like crystallisation.
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A 0. 0733 L balloon contains 0. 00230 mol of L, vapor at a pressure of 0. 924 atm.
What is the temperature, in Kelvin, of the I in the balloon?
Express the answer using 3 significant figures.
A 0.0733L balloon contains 0.00230 mol at a pressure of 0.924 atm.
V=0.0733 L
n=0.00230
P=0.924 atm
From the ideal gas law:
T=PV/nR
T= 359.12K
What is the ideal gas law?
The right fuel law, additionally known as the general gasoline equation, is an equation of the state of a hypothetical perfect gasoline. Despite the fact that the best gasoline law has numerous barriers, it is a superb approximation of the behavior of many gases underneath many situations. Benoit Paul Émile Clapeyron stated an appropriate gasoline regulation in 1834 as a combination of the empirical Charles’s regulation, Boyle’s regulation, Avogadro’s regulation, and gay-Lussac’s regulation.The perfect gas law states that the made of the strain and the volume of 1 gram molecule of a really perfect gasoline is the same to the fabricated from the absolute temperature of the gas and the prevalent gasoline consistent.To know more about the ideal gas law, click the link given below:
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Baed on relevant data/information that you provide on a country of your choice, what do you think the pace of technological change would in near future? explain your anwer uing a relavant theoretical framework and data
These technology would changes in near future
Artificial Intelligence
Gene Technology
Human-Computer Interfaces
What is Artificial Intelligence Technology?
The definition of artificial intelligence is the theory and development of computer programs that are able to do tasks and solve problems that usually require human intelligence
You've probably read or heard of the ubiquitous buzzword known as artificial intelligence, or AI. When you think about AI, articles about technology, the digital age, and robotics might come to mind. But what exactly is it, and how is it put to use?
Programming technology to solve problems is a technological advancement known as artificial intelligence
In-depth explanations of artificial intelligence's definition, applications, and future prospects are provided in this manual.
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A given sample of n2 gas has a pressure of 0. 30 atm at 30. 0 °c. If the volume is 2. 0 l, how many moles of n2 are present?.
The number of mols of N2 present 0.3 atm pressure and 30 °C is 0.0781 mol
What are mole?
The term "mole" (also spelled "mole") refers to a standard scientific unit for measuring large quantities of extremely small objects like atoms, molecules, or other specific particles. The mole represents 6.02214076 x 10^23 units, an astronomically large number.
At STP, which is denoted as 0°C (273.15 K, 32°F), the molar volume of a gas is 22.414 L/mol. By calculating the moles of nitrogen in 1.75 L at STP using dimensional analysis we get
1.75 L N2 divided by 1 mole per 22.414 L equals 0.0781 mol.
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In a single displacement reaction between al2s3 and li, what products will form and why?.
The products formed during the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al.
What are deplacement reactions?
When a more reactive element pushes a less reactive element out of a compound that also contains the less reactive element, a displacement reaction takes place. The less reactive element has undergone a displacement reaction and is now pure and unmixed.
In the reaction of Al₂S₃ and Li the following is observed:
Li+ Al₂S₃ = Li₂S₃ +Al
Lithium displaces aluminium here.
Hence the products formed during the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al.
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If matthew wa traveling into pace from earth, which of thee would he be able to reach firt
Alpha Centauri would he be able to reach first.
What is Alpha Centauri ?
At a distance of 4.37 light years, the star system known as Alpha Centauri is thought to be the one that is nearest to our solar system. Alpha Centauri A, Alpha Centauri B, and Alpha Centauri C, often known as Proxima Centauri, are the three stars that make up the stellar system.
The first mention of this star system dates back to 1592, when an explorer named Robert Hues brought it to light through his research. The binary character of the system wasn't understood until 1689. This star system has been the subject of extensive recent research, and studies conducted over the previous ten years have uncovered a number of interesting facts about Alpha Centauri.
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the explosive tnt has a heat of combustion of 3406 kj/mol. is this higher or lower than sugar?
TNT has a heat of combustion of -3406 kJ/mol compared to sugar's -5639 kJ/mol. TNT will blow up more quickly since it burns at a lower temperature. The heat-up time for sugar will be substantially longer.
What does explosion look like in TNT?A common way to convey energy is to use the term "TNT equivalent," which is often used to refer to the energy generated in an explosion. According to this convention, a ton of TNT is equal to 4.184 gigajoules, or around the amount of energy produced when a metric ton (1,000 kilograms) of TNT detonates.
How many gigajoules are there?The unit of measurement for energy consumption is the gigajoule (abbreviated as GJ), which is equal to one billion joules. At typical conditions, a gigajoule of natural gas is around 25.5 cubic meters. Approximately 27 liters of fuel oil, 39 liters of propane, 26 liters of gasoline, or 277 kilowatt hours of electricity are equivalent to one gigajoule of natural gas.
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Determine the [H] , pH, and pOH of a olution with an [OH−] of 2. 1×10−7 M at 25 °C. [H]=
Therefore, all you have to do is subtract 14 from the negative base-10 logarithm of the concentration of H+.
What is the equation for calculating pH and pOH?Simply deduct the pH from 14 to obtain the pOH. Take the negative log of the hydroxide ion concentration to determine the pOH. Simply subtract pOH from 14 to determine the pH.
What connection exists between the H+ concentration and the OH- concentration?The acidity of the solution increases with the amount of [H+] ions present. The more [OH-] ions there are in the solution, the more basic it is. Water has a unique characteristic that, depending on what is dissolved, causes it to behave as either an acid or a base.
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Which object has a mass of 27 grams. If each object has an identical *
volume of 3cm', which object has a mass of 27 grams
9 g/cm³ object has a mass of 27 grams.
Define mass?A substance or object's mass is a measurement of how much matter there is in it. Smaller masses can be measured in grams instead of kilograms (kg), which is the standard SI unit for mass (g).The kilogram is the kilogram, the standard international unit of mass (kg). Science and technology define a body's weight as the force that causes it to accelerate at a rate equal to the local acceleration of free fall in a given reference frame.The quantity of substance present in any item or body serves as the best definition of mass. We see mass in everything around us. For instance, objects like a table, chair, bed, football, glass, and even air have mass. Having said that, all things are light or heavy because of their mass.To learn more about mass refer to:
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Write the balanced COMPLETE
ionic equation for the reaction
when ammonium carbonate and calcium chloride are mixed in aqueous solution. If no reaction occurs, simply write only NR. Be sure to include the proper phases for all species within the reaction.
Answer:
Explanation:
ammonium carbonate + calcium chloride -----> ammonium chloride + calcium carbonate
(NH4)2CO3 + CaCl2 ----> NH4Cl + CaCO3
The balanced chemical equation for the given reaction is (NH₄)₂CO₃ + CaCl₂ ----> NH₄Cl + CaCO₃.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Task#1
After you’ve chosen a topic, you will research it. Make sure to be choosing reputable sources. These are the questions below that you need to complete. The main questions you’ll seek to answer are:
List all resources that were used: You will need to list at least 3 resources
What is your disturbance?
How is it caused?
Where in the world is this disturbance most commonly seen?
How does it impact biodiversity? What are other consequences?
What feedback mechanisms can be associated with your chosen disturbance? For this portion, you will have to research some indirect impacts that result from this disturbance.
What data sources can you find? For example, here is a graph about deforestation in Brazil, and the connection between the desire for agricultural land to grow soybeans, particularly when the price for soybeans is profitable..
Answer:1
Explanation:
1x1=1 1
Does a cold pack absorb or release energy
suppose you are performing an experiment during which the ph must be maintained at 3.70. what would be an appropriate buffer to use?
The acetate buffer pH. 3.7 should be used.
What is buffer and how to prepare?
A buffer is a solution that helps to maintain a stable pH level when acids or bases are added to it. It is composed of a weak acid and its conjugate base, or a weak base and its conjugate acid. Buffers are commonly used in chemical reactions, to maintain the pH of a solution at a certain level. To prepare a buffer, one must choose the desired pH and then select the appropriate weak acid or base and its conjugate partner. The weak acid and its conjugate base, or the weak base and its conjugate acid, must then be mixed in the correct proportions to create the desired buffer. The amount of acid or base added to the buffer solution can then be monitored to ensure the pH remains constant.
Dissolve 10g of anhydrous sodium acetate in 300ml of water, adjust the ph. to 3.7 with glacial acetic acid and dilute with water to 1000ml.
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When the balloon is released, air is pushed out by the balloon. Which other force is acting that demonstrates Newton's third law of motion?
The released air produces an equal force in the opposite direction of the motion of the air, which causes the balloon to move forward in accordance with Newton's Third Law of Motion.
What forces are at play when you release the balloon?As the balloon climbs, friction develops between the moving balloon and the air molecules it encounters. In opposition to the lift, drag and gravity's pull on the balloon's mass both exert downward forces. The balloon rises if the lift is greater than the drag and gravity's pull. One component of the force pair is the force of the balloon on the air, and the other component is the force of the air on the balloon.
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2. what is the nuclear binding energy of silver-110 in units of j/nucleon? the mass of a silver- 110 nucleus is 109.90611 amu.
The nuclear binding energy of silver is 1.5E-24 j/nucleon where the mass of a silver is 110
Formula used
Binding Energy per Nucleon = (Mass Defect×931.5)/Mass Number
B.E per nucleon = (∆m×931.5)/A
The bare minimal amount of energy needed to separate an atom's nucleus into its component protons and neutrons—collectively referred to as nucleons—is known as the nuclear binding energy in experimental physics. For stable nuclei, the binding energy is always positive since the nucleus needs to gain energy for the nucleons to move apart from one another. The strong nuclear force pulls nucleons toward one another. The nuclear binding energy is thought to be negative in nuclear physics theory. When the constituent nucleons are infinitely far apart from one another, it shows the energy of the nucleus in relation to their energies. With slightly differing emphasis on what the binding energy signifies, the experimental and theoretical points of view are equivalent.
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in most crystalline metals, plastic deformations caused by loads greater than the yield stress are the result of
In most crystalline metals, plastic deformations caused by loads greater than the yield stress are the result of dislocation motion.
The dislocation motion plays the important role in the plastic deformation. The plastic deformation occurs when a material will be stress. The resulting plastic deformation is the permanent change. this permanent change is cannot be recovered by the removing the the stress that caused the deformation. the plastic deformation caused by the dislocation motion. dislocation motion, atoms in metals to side readily.
Thus, the plastic deformations is caused by the dislocation motion. this plastic deformation is the permanent change and not be removed by the simply removing the stress.
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In double replacement reactions, why will two metals not combine with each other when products are formed?.
To solve such this we must know the concept of double displacement reaction. Therefore, in double replacement reactions two metals can not combine with each other when products are formed because cation and anion have to combine to form product.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
In double displacement reaction the two compounds react with each other. The cations of each compound exchange their places with ne another. Cations that are metals can not combine to form compound. Cation and anion combine to form a compound.
Therefore, in double replacement reactions two metals can not combine with each other when products are formed because cation and anion have to combine to form product.
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what element in the 4d subshell ends with 5 electrons
Answer:
Element Arsenic
Explanation:
PLEASE HELP!!!!!!
Q.4 Identify the acid in the reaction H₂Se + H₂O --> SeH⁻¹ + H₃O⁺¹ . (1 pt)
1. H₂Se
2. H₂O
3 .SeH⁻¹
4. H₃O⁺¹
Q.5 Identify the base in the reaction H₂Se + H₂O --> SeH⁻¹ + H₃O⁺¹
1. H₂Se
2. H₂O
3. SeH⁻¹
4. H₃O⁺¹
Q.6 Identify the conjugate acid in the reaction H₂Se + H₂O --> SeH⁻¹ + H₃O⁺¹
1. H₂Se
2. H₂O
3. SeH⁻¹
4. H₃O⁺¹
Q.7 Identify the conjugate base in the reaction H₂Se + H₂O --> SeH⁻¹ + H₃O⁺¹
1. H₂Se
2. H₂O
3. SeH⁻¹
4. H₃O⁺¹
The rate constant for weak acid and base for the dissociation is low, they do not easily dissociate in water. Therefore, option 1 is the correct option.
What are acid and base?Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base releases hydroxide ion OH⁻ ion when dissolved in water.
pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. Strength of acidic nature is directly proportional to the concentration of hydronium ion.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. Temperature affect the pH. At room temperature pH scale is between 0 to 14. 7 is the pH of neutral solution. A solution of the ionic salt NaF is basic in nature. The acid in the give equation is H₂Se as it is giving hydronium ion.
Therefore, option 1 is the correct option.
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what is the identity of a 100.0 g sample of metal that, upon absorbing 4680 j of heat, increases in temperature by 52.0 °c?
Aluminum is a metal whose temperature rises by 52.0 °C in a 100 g sample after absorbing 4680 J of heat.
What is specific heat capacity?
The amount of heat per unit mass needed to raise the temperature by one degree Celsius is known as the heat capacity or specific heat. The ability to distinguish between two polymeric composites using specific heat is useful in calculating processing temperatures and the quantity of heat required for processing.
We have a mass (m) of 100 g of an unidentified metal whose temperature (T) rises by 52.0°C after absorbing 4680 J of heat (Q). The amount of heat needed to raise the temperature of the unit mass by the unit of temperature is known as the specific heat capacity (c) of the metal.
The metal with the highest specific heat capacity is aluminum (0.900 J/g°C).
Aluminum is a metal whose temperature rises by 52.0 °C in a 100 g sample after absorbing 4680 J of heat.
Hence, Aluminum is the metal
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Which question about plants can be answered scientifically by classifying?
OA. Which kind of flower smells the best?
OB. What does a plant need in order to survive?
OC. What kinds of animals like to eat dandelion plants?,
OD. Is an oak tree a plant?
The question about plants can be answered scientifically by classifying is What kinds of animals like to eat dandelion plants? Therefore, option C is correct.
What kinds of animals like to eat dandelion plants?Many songbirds consume dandelion seeds, including chipping, field, house, song, and white-throated sparrows, American goldfinches, and indigo buntings. Bobwhite quail, wild turkeys, ruffed grouse, rabbits, white-tailed deer, and eastern chipmunks all consume dandelions.
They are one of the first food sources for bees, butterflies, moths, flies, beetles, and other insects because they bloom early in the spring. Dandelion seeds are eaten by finches and sparrows.
Thus, option C is correct.
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What particle can attract electrons?
Answer:
The protons and electrons of an atom are attracted to each other. They both carry an electrical charge. Protons have a positive charge (+) and electrons have a negative charge (-). The positive charge of the protons is equal to the negative charge of the electrons.
Explanation:
Please give the brainliest.
The land Masses Of South America, Africa, India, and Australia seem to fit together like puzzle pieces. The theory of continental drift suggests that these four lands were once one large mass of land until they broke apart and drifted to their current positions. Which of these statements does not support this theory?
A,) In 1944, Geologist B. Willis Says it seems impossible that the continents could move.
B.) in 1558 Geologist E. Suess Points out that the same plant fossils plant fossils plant are found in the southern parts of Africa, South America, Australia, Antarctica,&India
C.) In 1927, Geologist A. DU Toit Discovers An Almost Identical Sequence Of Rock Layers on the eastern coast of Soth America And the Western Coast Of Africa
D.) In 1965, Geologist E Bullard Uses computers to successfully match the coasts of South America and Africa
HELP THIS IS DUE IN FOUR DAYS
In the early 20th centaury, scientist Alfred Wagner proposed the theory of continental drift on which each continents are formed as they are now through the drifting of tectonic plates. However concepts of Geologist . B. Williams does not support this.
What is continental drift?A ground-breaking idea that explained how continents move around on the surface of the earth was known as continental drift. Alfred Wegener, a geophysicist and meteorologist, first suggested the theory in 1912, however it was later disproved by the majority of scientists.
Some of Wegener's theories were eventually proven by scientists and are now a part of the generally recognized theory of plate tectonics .The concept of drifting continents was first proposed in geoscience by Wegener's continental drift theory.
He asserted that the earth must have once been a single supercontinent before fragmenting into numerous separate continents. This clarified how related rock formations and fossilized plants and animals might survive on different continents.
However, the concept of B. Williams does not supports the drifting theory and he proposes that movement of continents is impossible. Thus, option A is correct.
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Mr. Chemistry added 1.6 g of NaOH to 50.0 mL of water. What is the concentration of his solution? (molar mass NaOH = 40.0 g/mol)
The concentration of the solution to which Mr. Chemistry added 1.6grams of NaOH solution is 0.08M.
How to calculate concentration?Molarity or concentration of a solution is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity of a solution can be calculated by dividing the number of moles in the solution by the volume as follows:
molarity = no of moles ÷ volume
moles = 1.6g ÷ 40g/mol = 0.04mol
molarity = 0.04 moles ÷ 0.500L
molarity = 0.08M
Therefore, 0.08M is the molarity of the solution.
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Study the pattern of digits shown here. Each digit represents a square that is blank or filled in. 000010000 Which picture could be encoded by this pattern? Responses 9 squares in 3 rows and 3 columns, with only the center square filled in. 9 squares in 3 rows and 3 columns, with only the center square filled in. 9 squares in 3 rows and 3 columns, with alternating squares filled in and blank. 9 squares in 3 rows and 3 columns, with alternating squares filled in and blank. 9 squares in a column, with the top and bottom squares filled in. 9 squares in a column, with the top and bottom squares filled in. 9 squares in a row, with all squares filled in
The picture that can be encoded by the pattern 000010000 is
9 squares in 3 rows and 3 columns, with only the center square filled in.
What is a pattern in math?A pattern in mathematics is a series of recurring figures, shapes, or numbers. Any kind of event or thing can be connected to a pattern.
A pattern has a rule that identifies the items that are part of the pattern and those that are not.
How to encode the patternThe pattern representing blank and filled can be encoded as follows
let 0 represents blank and 1 represent fill
The pattern 000010000 can be rewritten as
0 0 0
0 1 0
0 0 0
The represents 3 rows and 3 columns where all are blanks except the center is filled in
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How much energy does a wave with a frequency of 3.78 x 1010 Hz have?
The energy of the wave of frequency 3.78×10¹⁰ Hz is 2.5×10⁻²³ J.
What is energy?Energy is the ability or the capacity to perform work.
To calculate the energy of the wave, we use the formula below.
Formula:
E = hf......... Equation 1Where:
E = Energy of the waveh = Planck's constantf = Frequency of the waveFrom the question,
Given:
f = 3.78×10¹⁰ Hzh = 6.63×10⁻³⁴ J/HzSubstitute these values into equation 1
E = 3.78×10¹⁰×6.63×10⁻³⁴ E = 2.5×10⁻²³ JHence, the energy of the wave is 2.5×10⁻²³ J.
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Match the pictures -
element
mixture
compound
?
Answer:
Explanation:
1. It is an element since it has only one type of atom
2. It is a compound because 2 types of atoms are chemically bound
3. It is a mixture because it has 2 types of atoms which aren't bound
Answer:
First picture: Element
Second picture: Compound
Third picture: Mixture
Explanation:
First picture:
It represents an element as all the atoms are the same.
Second picture:
The other type of atoms are shown as chemically bonded to the green atoms — in the diagram the green atoms and pink atoms are touching.
Third picture:
It is representing a mixture as the other atoms are not chemically bonded together with the green atoms — the green and orange atoms are seperate and are just mixed
absolute zero is the temperature at which an ideal gas would have _____ volume. this temperature corresponds to _____ °c celsius and _____ k.
Absolute zero is the temperature at which an ideal gas would have 0 volume. This temperature corresponds to -273.15 °C celsius and 0 K.
Definition of Ideal gas
A theoretical gas composed of many randomly moving point particles that are not subject to interparticle interactions is known as an ideal gas. The ideal gas concept obeys the ideal gas law, a simplified equation of state, and is amenable to analysis under statistical mechanics, hence it is so useful.
Absolute zero temperature for an ideal gas
The theoretical temperature for al ideal gas is determined by extrapolating the ideal gas law; by international agreement, absolute zero is taken as −273.15 degrees on the Celsius scale.
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What is the nonmetallic ion in Lithium Oxide?
Answer:The ionic formula for Lithium Oxide is
L
i
2
O
.
Lithium is an Alkali Metal in the first column of the periodic table. This means that lithium has 1 valence electron it readily gives away in order to seek the stability of the octet. This makes lithium a
L
i
+
1
cation.?
Explanation:
Answer: O 2 2−
Explanation: I just ripped this