quiz ?s

The temperature is changed from 50 °C to -150 °C at constant pressure.

A-balloon one

What is oxidized and what is reduced in the following reaction? 2Al(s) + 3Br2(g) → 2AlBr3(s)

Al is oxidized and Br2 is reduced.

The correct formula for a compound formed from the elements Al and O is

Al2O3.

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3 produced? 4Fe(s) + 3O2 (g) → 2Fe2O3(s)

2 moles of Fe2O3/3 moles of O2

For the question(s) that follow, consider the following balanced equation. Mg3N2(s) + 6H2O(l) → 3Mg (OH)2(s) + 2NH3(g) What is the correct form of the conversion factor needed to convert the number of moles of H2O to the number of moles of NH3 produced?

2 moles of NH3/6 moles of H2O

A gas contained in a steel tank has a pressure of 1.5 atm at a temperature of 320 K. What will be the gas pressure when the temperature changes to 450 K, at constant moles and volume?

2.1 atm

How many molecules of water, H2O, are present in 75.0 g of H2O?

2.51 × 10^24 molecules

How many grams of N2 are produced from 100. g of NH3 in the following reaction? 4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)

206 g

A sample of argon gas at 300. °C and 50.0 atm pressure is cooled in the same container to a temperature of 0.00 °C. What is the new pressure?

23.8 atm

What is the molar mass of Mg3(PO4)2, a substance formerly used in medicine as an antacid?

263 g

For the reaction: 2H2O(l) + 137 kcal → 2H2 (g) + O2 (g), how many kcal are needed to form 2.00 moles O2 (g)?

274 kcal

1.25 moles of PbO2 have a mass of

299 g

How many valence electrons are in the electron-dot structures for the elements in group 3A(13)?

3

How many valence electrons are in the electron-dot structure of CCl4?

32

One mole of helium gas has a mass of

4.00

The pressure of 5.0 L of gas increases from 1.50 atm to 1240 mmHg. What is the final volume of the gas, assuming no change in moles or temperature?

4.6 L

In the reaction of nitrogen gas, N2, with hydrogen gas, H2, to form ammonia gas, NH3 , how many moles of hydrogen are needed to react with two moles of nitrogen?

6 moles

One mole of particles of any substance contains how many particles?

6.02 × 10^23

A diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a temperature of 15 °C. What is the volume of the bubble when it reaches the surface where the pressure is 1.0 atm and the temperature is 27 °C, if the moles are constant?

630 mL

Find the mass of AlCl3 that is produced when 25.0 grams of Al2O3 react with excess HCl according to the following equation. Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(l)

65.4 g

When 60.0 g of CH4 reacts with excess O2, the actual yield of CO2 is 112 g. What is the percent yield? CH4 + 2O2 → CO2 + 2H2O

67.9%

What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 + ? O2 → 5CO2 + 4H2O

7

How many atoms of neon are present in 1.30 moles of neon?

7.83 × 10^23 atoms

Which measurement describes the pressure of a gas?

725 mmHg

The unit of 1 atmosphere used to describe the pressure of a gas is equal to

760 mmHg

How many valence electrons are in the electron-dot structure of H2O?

8

Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer the question(s) that follow about this reaction. C5H12 + ? O2 → ? CO2 + ? H2O What is the coefficient for oxygen in the balanced equation?

8

Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq)When 25.0 g of Zn reacts, how many L of H2 gas are formed at 25 °C and a pressure of 854 mmHg?

8.32 L

How many grams of CO2 are produced from 125 g of O2 and excess CH4? CH4 + 2O2 → CO2 + 2H2O

85.9 g of CO2

The ammonia molecule ( NH3) is

a polar molecule with polar bonds

Double and triple bonds form because

single covalent bonds do not give all of the atoms in the molecule eight valence electrons.

The carbon tetrachloride molecule, CCl4, has the shape of a

tetrahedron.

At 570. mm Hg and 25 °C, a gas sample has a volume of 2270 mL. What is the final pressure (in mmHg) at a volume of 1250 mL and a temperature of 175 °C, if the moles are constant?

1560 mmHg

At STP, what is the mass of 11.2 liters of O2 gas?

16 g

A tank contains a mixture of helium, neon, and argon gases. If the total pressure in the tank is 490. mmHg and the partial pressures of helium and argon are 215 mmHg and 102 mmHg, respectively, what is the partial pressure of neon?

173 mmHg

How many lone pairs of electrons are in the electron-dot structure of H2O?

2

At STP, how many moles of helium gas would occupy 1.00 L?

0.0446 moles

How many moles of K2SO4 are in 15.0 g of K2SO4?

0.0861 moles

The volume of a gas with an initial pressure of 380 mmHg atm increases from 5.0 L to 8.0 L. What is the final pressure of the gas,in atm, assuming no change in moles or temperature?

0.31 atm

For the question(s) that follow, consider the following equation. 2Mg + O2 → 2MgOThe number of moles of MgO produced when 0.20 mole of O2 reacts completely is

0.40 mole

How many moles of neon occupy a volume of 14.3 L at STP?

0.638 moles

The atmospheric pressure in Denver, CO is 633 mmHg. What is this pressure in atm?

0.833 atm

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride? Pb(NO3)2(aq) + NaCl(aq) → PbCl2(s) + NaNO3(aq)

2

At STP, what is the volume of 4.50 moles of nitrogen gas?

101 L

A 5.00-L tank contains helium gas at 1.50 atm. What is the pressure of the gas in mmHg?

1140 mmHg

The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of the sample of gas, if the pressure and moles in the container is kept constant?

1170 mL

for the question(s) that follow, consider the following balanced equation. Mg3N2(s) + 6H2O(l) → 3Mg (OH)2(s) + 2NH3(g) When 2 moles of Mg3N2 are allowed to react, how many moles of H2O also react?

12 moles

At constant temperature, a sample of helium at 760. torr in a closed container was compressed from 5.00 L to 3.00 L, with no change in moles or temperature. What was the new pressure exerted by the helium on its container?

1270 Torr

Choose the best electron-dot structure for OCl2

CI-6 O-4 CI-6

Which of the following compounds contains an ionic bond?

CaO

The name of the Cu+ ion is

Copper (I)

Which one of the following elements forms two or more ions with different ionic charges?

Fe

What is the correct formula for iron(III) sulfide?

Fe2S3

Which one of the following compounds contains an ion with a 3+ charge?

FeCl3

A polar covalent bond is found in which of these compounds?

H2O

The name of the HSO4- ion is

Hydrogen Sulfate

What is the symbol for the ion with 19 protons and 18 electrons?

K+

Which of the following elements has the lowest electronegativity?

Li

The correct formula for the compound formed from Mg and S is

MgS

Which of the following is an oxidation-reduction reaction?

N2 + O2 → 2NO

The formula for a molecule formed from N and Cl would be

NCI3

What is the formula of a compound that contains Na+ and PO43- ions?

Na3PO4

The total pressure in a mixture of gases is equal to the partial pressure(s) of

all the gases added together.

According to the kinetic theory of gases, particles of a gas

are very far apart

In a ________ reaction, two or more elements or compounds form one product.

combination

What is the classification for this reaction? SO3 (g) + H2O (l) → H2SO4(l)

combination

The types of compounds that use prefixes in their names are

covalent compounds.

As you rise higher in Earth's atmosphere, the atmospheric pressure

decreases.

In Charles's Law, the volume of a gas ________ when the ________ decreases.

decreases; temperature

The strongest interactions between molecules of iodine I2 are examples of

dispersion forces

The ability of an atom to attract the shared electrons in a covalent bond is its

electronegativity.

Any reaction that absorbs 150 kcal of energy can be classified as

endothermic

In an endothermic reaction

energy is absorbed by the system

How many valence electrons does nitrogen have?

five

How many electrons will chlorine gain or lose when it forms an ion?

gain 1

The strongest interactions between molecules of ammonia ( NH3) are

hydrogen bonds

Which of the following is NOT a potential use for a hyperbaric chamber?

increasing the rate at which a broken bone heals

How many electrons will aluminum gain or lose when it forms an ion?

lose 3

Which of the following describes an oxidation reaction?

loss of electrons or gain of oxygen

The boiling point of water at sea level is 100 °C. At higher altitudes, the boiling point of water will be

lower, because the atmospheric pressure is lower.

The compound MgCl2 is named

magnesium chloride

In ionic compounds, ________ lose their valence electrons to form positively charged ________. (5,2)

metals/cations

In the kinetic molecular theory of gas behavior, the assumption is made that gas molecules

move rapidly in random directions.

Which of the following polyatomic ions has a 3- ionic charge?

phosphate

Which of the following polyatomic ions has a 3- ionic charge? Group of answer choices

phosphate

which of the following polyatomic ions has a 3- ionic charge?

phosphate

The water molecule has a dipole with the negative portion

pointing toward the oxygen atom.

A group of covalently bonded atoms that has an overall electrical charge is called a(n)

polyatomic ion.

The shape of the ammonia molecule ( NH3) is

pyramidal