Answer:
Explanation:Metalloids may act either like metals or nonmetals in chemical reactions. Most metalloids have some physical properties of metals and some physical properties of nonmetals. They fall between metals and nonmetals in their ability to conduct heat and electricity. They are shiny like metals but brittle like nonmetals.
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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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
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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Two or more substances mingled together, but not chemically combined are known as a ?
Answer:
hdhdjsusjgsusnsmmdmdjsggwgebdubdudhdbr dhfbbdurbsbbdbdhdbd hdbdbvdbbdbd
Answer:
mixture of a material made up of two or more different substances, which are mixed but not combined chemically are retained
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 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.
2) A gas takes up a volume of 15 liters, has a pressure of 3.3 atm, and a temperature of
299 K. If I raise the temperature to 350 K and lower the pressure to 1050 mmHg, what is the
new volume of the gas?
3) A gas that has a volume of 28 liters, a temperature of 65 °C, and an unknown pressure
has its volume increased to 36 liters and its temperature decreased to 35 °C. If I measure the
pressure after the change to be 2.0 atm, what was the original pressure of the gas?
work too pls !!! thank you so much !!!
Answer:
Explanation:
[tex]\frac{P1V1}{T} = \frac{P2V2}{T2} = \frac{3.3 *15}{299} = \frac{1050*V}{760*350}[/tex]
v= 41.9 L
b) using the same formula as above [tex]P1= \frac{P2V2*T1}{T2 * V1}= \frac{36*2*338}{308*28} = 2.8 atm[/tex]
hope it helps
The
percent yield for the reaction in which 15.6 g of aluminum
hydroxide is reacted in excess hydrogen chloride gas is 92.5
%. What is the actual yield of aluminum chloride?
Answer:
24.6
Explanation:
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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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
Add 2 teaspoons of baking soda and 2 teaspoons of citric acid to the foam cup. Add the half cup of water to the cup and stir. Is a chemical reaction taking place? How do you know?
Answer:
Yes a chemical reaction is taking place
Explanation:
In this cooking procedure, a chemical reaction is taking place because the citric acid and the baking soda are both chemical species combining together.
At the end a new produce is formed. It is accompanied by a release of heatThe stirring helps to increase the rate of chemical reaction between the citric acid and baking sodaAnswer:
The temperature for it is between 50-55 degrees
Explanation:
Which statements describe or apply the principal of conservation of energy? Select all that apply.
* A. Energy cannot be created or destroyed; it can only be transferred from one location to
another.
B. Home insulation can reduce energy bills by conserving energy that would otherwise be lost.
* C. If the temperature in one location decreases, then the temperature in another location
increases.
D. The total energy in a closed system such as Earth stays the same.
E. Nonrenewable energy resources can be conserved, but they will eventually run out.
Answer:
A, C, and D
Explanation:
The correct options that apply to the principal conservation of energy are A, C, and D.
A is correct because energy can neither be created nor destroyed. However, energy can be transfered from one location to another or be converted from one form to another. Whether transferred to converted, the magnitude remains the same.
C is correct because energy cannot be destroyed but can be transferred or converted. Hence, if a body or a location loses temprature, then the loss is being gained by another body or location.
D is also correct. A closed system is a system that does not exchange matter with its surroundings. Hence, the total energy remains the same within the system.
Answer:
The total energy in a closed system such as Earth stays the same.
Explanation:
The simplest statement of the law of conservation of energy is that energy can neither be created nor destroyed but can be converted from one form to another.
A typical illustration of this principle of conservation of energy is a closed system of which our universe is an important example.
The total amount of energy in the universe is always a constant. Energy lost in one part must be equal to the energy gained on the other part.
Choose all the answers that apply.
Electricity
can be created by moving magnets through a coll of copper wire.
can be used to create a magnetic field.
is caused by moving protons.
flows from negative to positive.
is created by the movement of electrons.
Answer:
can be created by moving magnets through a coll of copper wire.
can be used to create a magnetic field.
flows from negative to positive.
is created by the movement of electrons.
Explanation:
CO, + H2O –H^2 CO^3 The reaction is which type of chemical reaction?
Answer:
Combination or synthesis reaction
Explanation:
The reaction is a combination or synthesis reaction.
Let us write the reaction equation:
CO + H₂O → H₂CO₃
A combination or synthesis reaction is one in which a single product forms from two or more reactants. The formation of a compounds from the union of their constituent elements falls into this category of reaction.
The combination of carbon monoxide and water to give hydrogen carbonate is one of such reaction.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
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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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.
Hope this helps :)
Which substance is most likely metallic
The substance which is most likely metallic is that with least number of valence electrons according to electronic configuration.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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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
In addition to having a blue color, what other characteristic do Neptune and Uranus share?
no rings
27 moons
no axis tilt
cold temperatures
Answer:
no rings
Explanation:
Answer:
d: cold temperatures
Explanation:
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.
hope this helps
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.
What element is Group 6, period 6
Answer:
That is Tungsten .
Explanation:
Is a hydrogen bond a true chemical bond?
Answer:
A hydrogen bond is the electromagnetic attraction created between a partially positively charged hydrogen atom attached to a highly electronegative atom and another nearby electronegative atom. A hydrogen bond is a type of dipole-dipole interaction; it is not a true chemical bond.
Explanation:
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.
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.
According to newtons first law of motion, which of the following objects will change its motion?
What is another name we use to refer to "energy levels"?
Answer:
Energy state
Explanation:
Chemists want to place 2 x 10^24 atoms of carbon in a chemical reaction. How would they obtain this amount?
Answer:
Explanation:
To determine what is been asked in this question, firstly, the formula to determine the number of atoms present in a substance must be used. The formula is
number of atoms = n × 6.02 × 10²³
where n is the number of moles
6.02 × 10²³ is avogadro's number
The number of atoms needed (to be present) has already been provided in the question as 2 × 10²⁴
Thus;
2 × 10²⁴ = n × 6.02 × 10²³
n = 2 × 10²⁴ ÷ 6.02 × 10²³
n = 3.32
The number of moles of carbon that will be placed in the reaction will be 3.32 but to determine the amount/mass of carbon that will be used in the reaction, we will use the formula
n = mass/molar mass
The molar mass of carbon is 12 g/mol
Thus;
3.32 = mass/12
mass = 3.32 × 12
mass = 39.84 g
The mass of carbon that will be required for the reaction will be 39.84, the procedure above shows how to obtain this amount.
Which best describes the difference between radiation and conduction? (1 point)
A.) Conduction cannot happen when both objects are solids.
B.)
Conduction requires two objects to be in physical contact.
C.)
Conduction can occur between two objects that are very far apart.
D.)
Conduction decreases the movement of the atoms in both objects.
Answer:
B) Conduction requires two objects to be in physical contact.
Explanation:
Conduction is when two objects are directly touching each other. So, the objects must come in physical contact with each other.