PLSSS help with this question
A group of cells doing the same job forms a tissue. A group of tissues working together forms an organ. Organs work in groups, too. A group of organs doing the same job is called a system.
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How many molecules of water are in 0.578 moles of water?
A substance's molar mass is the mass in grams of one mole of the compound. A mole is the number of entities present in a substance, such as atoms, molecules, or ions. A mole of any substance is defined as 6.022 × 10²³ molecules.
0.578 moles of water contains 3.45 × 10²³ molecules.
What is Mole concept?A mole is defined as the quantity of a substance containing the same number of discrete entities (atoms, molecules, ions, and so on) as the atoms in a 12μg of genuine 12C.The number of particles present in one mole of any substance is represented by Avogadro Number=6.Amedeo Avogadro, an Italian scientist known as one of the founders of physical chemistry, was born on this day in 1776. Avogadro studied electricity and liquids, but his most famous work was with gases.A substance's molar mass is the mass in grams of one mole of the compound. A mole is the number of entities present in a substance, such as atoms, molecules, or ions. A mole of any substance is defined as 6.022 × 10²³ molecules.1 mole contains 6.022 × 10²³ molecules
0.578 moles of water contains 0.578 × 6.02 × 10²³ molecules
= 3.45 × 10²³ molecules.
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A sample of calcium bromide contains 0.2 g calcium and 0.8 g bromine by mass. Calculate the empirical formula of calcium bromide.(relative atomic masses: Ca = 40, Br = 80). Show the calculation.
The empirical formula for calcium bromide has been [tex]\rm CaBr_2[/tex].
The empirical formula has been given with the simplest whole number ratio of the chemical formula.
The moles of calcium in calcium bromide has been:
[tex]moles=\dfrac{mass}{mwt}[/tex]
[tex]moles_C_a=\dfrac{0.2}{40} \\moles_C_a=0.005[/tex]
The moles of bromine in calcium bromide has been:
[tex]moles_B_r=\dfrac{0.8}{80} \\moles_B_r=0.01[/tex]
The simplest whole number ratio for Br and Ca has been given by dividing moles of Ca and Br with moles of Ca.
The simplest whole number of Ca:[tex]\rm Ca=\dfrac{0.005}{0.005} \\Ca=1[/tex]
The simplest whole number of Br:[tex]\rm Br=\dfrac{0.01}{0.005} \\Br=2[/tex]
From the whole numbers, the empirical formula for calcium bromide has been [tex]\rm CaBr_2[/tex].
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Which explains the law of conservation of mass?
a. Every reaction creates an equal amount of mass related to the amount of
energy required for the reaction.
b. The total mass before a chemical reaction is the same as the total mass after
the reaction.
c. Matter can not be conserved.
d. The total amount of mass is equal to the volume of both chemicals in the
reaction.
Answer:
A is your answer.
Explanation:
This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system. In other words, in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
HELP
2. The Kinetic Energy of a particle can be represented by _______________.
(2 Points)
A. mass x speed
B. 1/2 mass x velocity
C. mass x velocity
D. 1/2 mass x velocity squared
Answer:
D
Explanation:
Tanya planted seedlings in her garden over the weekend. The instructions that came with the seedlings stated that they need to be planted 0.2 meters apart. Tanya has a measuring tape that has values in centimeters. Help Tanya convert meters to centimeters. Determine the ratio to use: . Tanya should plant the saplings 20 centimeters apart. 1 meter is equal to 100 centimeters. Multiply the given value by the ratio: . answer it right now
Answer:
put them 205 centimeters apart
Explanation: i just know
Answer:
1 Meter is equal to 100 centimeters
Determine the ratio to use 100cm/1m
Multiply the given value by the ratio: 0.2m * 100cm/1m
Tanya should plant the saplings 20 centimeters apart
Explanation:
In 1913, a scientist named Henry Mosley discovered that the properties of elements rely partially on—
A: their color
B: their atomic mass
C: the properties of electrons
D: their atomic size
A sample of carbon dioxide at RTP is 0.50 dm3. How many grams of carbon dioxide do we have?
Answer:
0.924 g
Explanation:
The following data were obtained from the question:
Volume of CO2 at RTP = 0.50 dm³
Mass of CO2 =?
Next, we shall determine the number of mole of CO2 that occupied 0.50 dm³ at RTP (room temperature and pressure). This can be obtained as follow:
1 mole of gas = 24 dm³ at RTP
Thus,
1 mole of CO2 occupies 24 dm³ at RTP.
Therefore, Xmol of CO2 will occupy 0.50 dm³ at RTP i.e
Xmol of CO2 = 0.5 /24
Xmol of CO2 = 0.021 mole
Thus, 0.021 mole of CO2 occupied 0.5 dm³ at RTP.
Finally, we shall determine the mass of CO2 as follow:
Mole of CO2 = 0.021 mole
Molar mass of CO2 = 12 + (2×16) = 13 + 32 = 44 g/mol
Mass of CO2 =?
Mole = mass /Molar mass
0.021 = mass of CO2 /44
Cross multiply
Mass of CO2 = 0.021 × 44
Mass of CO2 = 0.924 g.
Compare these examples of matter. Which of these is a pure substance and why? A Milk, because every portion of the matter is the same, and its components can only be separated chemically. B Coffee, because every portion of the matter is the same, and its components can only be separated chemically. C Salt water, because every portion of the matter is the same, and its components can only be separated chemically. D Carbon dioxide, because every portion of the matter is the same, and its components can only be separated chemically.
Answer:
B. Coffee
Explanation:
Coffee, because every portion of the matter is the same, and its components can only be separated chemically.
The matter is present everywhere. The matter can be a pure substance, mixture, etc. Coffee is a pure substance that is characterized by constant composition. Thus, option B is correct.
What is a pure substance?A pure substance is defined by the elements and molecules that have the same composition and definite properties and characteristics. All elements and molecules are pure substances.
Coffee is a pure substance that by any physical method cannot be separated into its constituents. They have characteristic chemical and physical properties with a definite composition.
Milk is a colloidal mixture and not a pure substance made of more than combinations. Salt-water is a mixture made of various salts dissolved in water. Similarly, carbon dioxide is a compound made of molecules.
Therefore, option B. coffee is a pure substance.
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Compared to orange light, violet light
I: has a longer wavelength
II: has a higher frequency
III: has a higher energy
IV: has the same speed
Group of answer choices
II, III
I,III
II, III, IV
I, IV
Answer:
i think it was lll,lV ㄸㄸㅇㅊㅎㅍㅋ
what happens when a gas obtained by heating Ammonium Chloride and slaked lime are passed through copper sulphate ?
Answer:
Consequently, what happens when gas obtained by heating slaked lime and ammonium chloride is passed through copper sulphate solution? The HCl in the gas mixture will form hydrochloric and the H+ will react with some of the NH3(aq), forming NH4^+, and with some of the SO4^2-, forming HSO4^-.
The gas obtained by heating Ammonium Chloride and slaked lime is passed through copper sulphate, deep blue solution will be formed.
Gas obtained from heating Ammonium ChlorideThe gas obtained by heating Ammonium Chloride and slaked lime is ammonia gas.
2NH₄Cl + Ca(OH)₂ ---> CaCl₂ + 2NH₃ + 2H₂O
Reaction of ammonia gas with copper sulphateAmmonia reacts with copper (II) ions to precipitate light blue copper hydroxide.
Ammonia causes the copper ion to go back into the solution as a deep blue ammonia complex.
However, in excess ammonia, the precipitate dissolves.
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Question 1 of 15
The systematic way to assign names to chemical compounds is called:
A. Elemental nomenclature
B. Chemical nomenclature
C. Stock system
D. Physical nomenclature
Answer:
Chemical nomenclature
So simple distillation is used to separate a mixture of two immiscible liquids (for example acetone and water) When we are boiling the mixture in the distilling flask, and we reach the boiling point of one of the liquids (example: 56 degrees boiling p of acetone), how do we maintain this temperature and not allow the liquid to gain higher temperature?
Answer:
reduce the heat
Explanation:
the heat should be reduced to prevent the water to reach it's boiling point(70°).
What is the activity series of metals?
A. A list of metals arranged in order of atomic number
B. A list of metals arranged in order of electronegativity
C. A list of metals arranged in order of reactivity
D. A list of metals arranged in order of oxidation state
Answer:
C.A list of metals arranged in order of reactivity
The activity series of the metal is the orderly arrangement of the metals based on the reactivities that show the power of one metal to displace another in a reaction. Thus, option C is correct.
What is reactivity series?A reactivity series is the arrangement of the metals that shows the analytical progression and the decreasing order of the reactivity. The reactivity series is also called the activity series.
The chart depicts the vigorous nature of the metal that allows them to displace another in a displacement reaction. The reactivity is based on the element that loses its electron more easily.
The reactivity series is based on the element's ability to displace the hydrogen from the acidic solutions and hence, makes them more reactive than the others.
Therefore, the activity series depicts the reactivity.
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A flower's color is a trait that is passed from one generation to the next generation. How a trait such as flower color is physically expressed after being passed from one generation to the next generation is called a(n) Responses A. genotype. B. chromosome. C. phenotype. D. allele.
The noble gases include helium, neon, argon, and xenon. What do their electron configurations have in common?
Answer:
their outer electron shell is full
Explanation:
they are named noble because they are non-reactive
The noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.
What are electrons?Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. Electrons are fundamental to many physical processes, including gravity, electromagnetic interactions, weak interactions, electricity, magnetism, chemistry, and thermal conductivity.
Noble gases are defined as any of a class of extremely stable, very slow-reacting rare gases, such as helium, neon, argon, krypton, xenon, and typically radon. In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. They are known as noble gases because of how beautiful they are and how little they generally react with anything. For this reason, they are also referred to as inert gases. The outer shell of the noble gas are completely filled.
Thus, the noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.
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List two examples of items that undergo sublimation
Answer:
Examples of solids that sublime are dry ice (solid carbon dioxide), iodine, arsenic, and naphthalene (the stuff mothballs are made of).
Explanation:
What is the electron configuration of an atom of Boron with a charge of +3
Answer:
2
Explanation:
B has a configuration as 2,3 so when it becomes + 3 that means it has given out its 3 electrons to be stable so it becomes 2
2.911 grams of ethanol C2H5OH is burned and produces how many grams of water vapor?
Please help me or I'm dead.
Answer:
3.4g
Explanation:
Given parameters:
Mass of ethanol = 2.911g
Unknown:
Mass of water vapor = ?
Solution:
To solve this problem, let us write the balanced reaction equation first;
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
Now find the number of moles of ethanol;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of ethanol = 2(12) + 5(1) + 16 + 1 = 46g/mol
Number of moles = [tex]\frac{2.911}{46}[/tex] = 0.06mole
So;
1 mole of ethanol will produce 3 moles of water vapor
0.06mole of ethanol will produce 0.06 x 3 = 0.19moles of water vapor
Mass of water vapor = number of moles x molar mass
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Mass of water vapor = 0.19 x 18 = 3.4g
What element is Group 6, period 6
Answer:
That is Tungsten .
Explanation:
What happens to water when it warms above 4 C
Answer:
it will expand.
Explanation:
The expansion of water when you cool it to lower temperatures is unusual, since most liquids contract when they're cooled.
True or false? Salt water takes a shorter time to boil than regular water.
Send help!!!!
Answer:
false
salt water does the oppsotie
Explanation:
The periodic table is organized by
A)
atomie mass:
B)
atomic size,
C)
atomic number
D)
atomic periodicity
Answer:
i believe it's A-atomic mass
Explanation:
hope this helps u, sorry if it doesn't.
Answer:
The periodic table is organized by atomic number. If you look closely, the atomic number is usually at the top of the element square. It goes in counting order horizontally.
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THIS is SO easy PLEASE help ME ! ill ALSO mark YOU brainliest !
Which sings shake the room A pop smoke and Quavo B Roddy Ricch C YoungBoy never Broke Again D lil yatchy
Answer:
YoungBoy Never Broke Again. Explanation: He is the goat
Solute affects the freezing point of a solvent because, it hinders clustering of the solvent particles and forces the molecules away from the cluster. For the solvent molecules to reach the cluster and add themselves to the freezing solid, they have to be decreased to a lower kinetic energy by lowering the temperature
Answer:
They have to be decreased to a lower kinetic energy by lowering the temperature
Explanation:
Solute affects the freezing point of a solvent because, When a substance starts to freeze, the molecules slow down due to the decreases in temperature, and the intermolecular forces start to take over. Therefore, they have to be decreased to a lower kinetic energy by lowering the temperature
Why do the more complex sugar disaccharides store more energy than
monosaccharides?
Answer:
c) disaccharides have more chemical bonds
Explanation:
disaccharides are made from the condensation of two monosaccharides.
This means there are more bonds in disaccharides. More bonds mean greater energy and vice versa .
How many carbon atoms are represented in the formula for CaMg3(CO3)4
PLEASE i need some help asap it can be any part, I'll be grateful
Answer:
what do u need help with
Explanation:
I can help uu
The pressure is changed from 500 kPa to 250 kPa. What would you expect the new volume to be if the initial volume is 200 mL?
Answer:
The answer is 400 mLExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
So we have
[tex]V_2 = \frac{500000 \times 200}{250000} = \frac{100000000}{250000} = \frac{10000}{25} \\ [/tex]
We have the final answer as
400 mLHope this helps you