Chemistry Final Multiple Choice Questions

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What is not an example of matter?

heat.

A golf ball has more mass than a tennis ball because it..

contains more matter.

A vapor is which state of matter?

gas.

Which state of matter has a definite volume and takes the shape of its container?

liquid.

Which state of matter takes both the shape and volume of its container?

liquid.

Which state of matter is characterized by having a definite shape and a definite volume?

solid.

Which of the following is a physical change?

evaporation.

Which of the following is a heterogeneous mixture?

steel.

Which of the following is a homogeneous mixture?

salt water.

Which of the following is true about compounds?

they can be physically separated into their component elements.

The first figure in a properly written chemical symbol is always..

capitalized.

The chemical symbol for iron is..

Fe.

Which of the following is a chemical property?

ability to react with oxygen.

In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?

water.

Which of the following is NOT apart of Dalton's atomic theory?

atoms are always in motion.

Which of the following is true about subatomic particles?

the mass of a neutron nearly equals the mass of a proton.

All atoms are...

neutral, with the number of protons equaling the number of electrons.

The nucleus of an atom is..

the central core and is composed of protons and neutrons.

The atomic number of an element is the total number of which particles in the nucleus?

protons.

An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are...

76 protons and 76 electrons.

The sum of the protons and neutrons in an atom equals the...

mass number.

Isotopes of the same element have different...

numbers of neutrons.

How many protons, electrons, and neutrons does an atom with the atomic number 50 and the mass number 125 contain?

50 protons, 50 electrons, 75 neutrons.

If E is the symbol for an element, which 2 of the following symbols represent isotopes of the same element?

E: 20-10 &
E: 21-10

In which of the following is the number of neutrons correctly represented?

238:92; U has 146 neutrons.

Which of the following is necessary to calculate the atomic mass of an element?

the atomic number.

In Bohr's model of the atom, where are the electrons and protons located?

the electrons move around the protons, which are at the center of the atom.

How does the energy of an electron change when the electron moves closer to the nucleus?

it decreases.

How many energy sublevels are in the second principal energy level?

2.

What is the maximum number of orbitals in the p sublevel?

3.

What is the electron configuration of potassium?

1s2, 2s2, 2p6, 3s2, 3p6 ,4s1

Stable electron configurations are likely to contain...

filled energy sublevels.

The quantum mechanical model of the atom...

involves the probability of finding an electron in a certain position.

What is another name for the representative elements?

group A elements.

Which of the elements is in the same period as phosphorus?

magnesium.

Of the elements Pt, V, Li, and Kr, which is a nonmetal?

Kr.

The atomic number of an element is the total number of which particles in the nucleus?

protons and neutrons.

Which of the following elements is a transition metal?

copper.

Which of the following statements is true about ions?

cations form when an atom loses electrons.

In which of the following groups of ions are the charges all shown correctly?

Ca2+, Al3+, Br-

Which of these elements does not exist as a diatomic molecule?

H

Why do atoms share electrons in covalent bonds?

to attain a noble-gas electron configuration.

In which of the following compounds is the octet expanded to include 12 electrons?

H2S

What type of ions have names ending in -ide?

only anions.

When Group 2A elements form ions, they...

lose two electrons.

What determines that an element is a metal?

its position in the periodic table.

An -ate or -ite at the end of a compound name usually indicates that the compound contains..

a polyatomic anion.

Which of the following formulas represents an ionic compound?

N2O4

In which of the following is the name and formula given correctly?

sodium oxide, NaO

Which of the following shows correctly an ion pair and the ionic compound the two ions form?

Fe3 + O2- ; Fe2O3

Select the correct formula for sulfur hexafluoride..

SF6

What is the correct name for the compound CoCl2?

cobalt(II)chloride

Which of the following is the correct name for N2 O5?

dinitrogen pentoxide

In the chemical equation H2O2 (aq) ---> H2O(l)+O2(g), the O2 is a...

product.

Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?

P(s)+O2(g) ---> P2O5(s)

What are the coefficients that will balance the skeleton equation below?

3, 1, 2

When the following equation is balenced, what is the coefficient for HCl? Mg(s) + Hcl(aq) --> MgCl2 (aq) + H2 (g)

2

Chemical equations must be balanced to satisfy...

the law of definite proportions.

What are the missing coefficients for the skeleton equation below? Al2 (SO4)3(aq) --->Al(OH)3(aq)+K2 SO4(aq)

1, 6, 2, 3

In a combustion reaction, one of the reactants is...

oxygen.

In a double-replacement, the..

reactants are two ionic compounds.

What are the correct formulas and coefficients for the products of the following double-replacement reaction? Rb Oh + H2 PO4-->

H2 Rb+PO4 OH

Which of the following statements is NOT true about double-replacement reactions?

the reactant may be a solid metal.

The complete combustion of which of the following substances produces carbon dioxide and water?

CaHCO3

The reaction 2Fe + 2Cl2 ---> 2FeCl3 is an example of which type of reaction?

combination reaction.

The equation 2C3 H7 OH+ 902 --> 6CO2 + 8H2 O is an example of which type of reaction?

combustion reaction.

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