Physical Science B

1.

1 point

You have 338g of chromium, which has a molar mass of approximately 52 g/mol. How many moles of chromium do you have?

0.1538 mol

3.38 g

6.50 mol

77576 g

2.

1 point

Polymers are large organic molecules that are made of

cations

anions

carbon and oxygen only

repeating units

3.

1 point

Which statement is true according to Dalton's Theory?

atoms of different elements can join to form larger atoms.

atoms can be divided into smaller particles.

atoms of the same element differ in electronic charge.

atoms of the same element are exactly alike.

4.

1 point

Which of the following is made of at least two different types of atoms?

element

molecule

compound

matter

5.

1 point

A solid becomes a gas through a process called

sublimation

condensation

evaporation

freezing

6.

1 point

Ionization refers to the process of

changing from one period to another.

losing or gaining protons.

turning lithium into flourine.

losing or gaining electrons.

7.

1 point

Elements with in the same group in the periodic table have similar properties because they have the same number of

protons.

neutrons.

ions.

valence electrons.

8.

1 point

Which statement about the modern model of the atom is NOT true?

electrons can be found between energy levels.

electrons can be found only in certain energy levels.

the precise location of electrons can not be predicted.

electrons are most likely to be found in orbitals.

9.

1 point

Pascal's principle states that a fluid in equilibrium enclosed by a vessel exerts pressure

upwards.

toward the vessel's opening.

equally in all directions.

downwards.

10.

1 point

In his version of the periodic table, Mendeleev based his arrangement of the elements on an element's

atomic number.

name.

chemical symbol.

atomic mass.

11.

1 point

A mole is an SI base unit that describes the

mass of a substance.

amount of a substance

volume of a substance

electric charge of a substance

12.

1 point

A lithium ion is much less reactive than a lithium atom because it

much more massive.

has a filled outer s orbital.

has a negaive electonic charge.

has no charge.

13.

1 point

How does the density of an object that sinks into a fluid compare to the density of the fluid?

The object that sinks is less dense than the fluid.

The object that sinks is denser than the fluid.

The object that sinks is as dense as the fluid

The density of the object is not related to the density of the fluid.

14.

1 point

In a metallic bond, the nucleus of one atom is attracted by a nearby atom's

nucleus

negative ion

energy structure

electrons

15.

1 point

Knowing the chemical properties of a substance will tell you how the substance

looks

can be broken down into atoms

smells

reacts with other substances

16.

1 point

The force keeping an object floating on a liquid is called

viscosity.

buoyant force.

natural force.

surface tension.

17.

1 point

As one moves from left to right across a period in the modern periodic table, elements become

smaller.

less metallic.

lighter.

more unlike each other.

18.

1 point

You put a spoonful of salt into 1 liter of water and stir. The resulting liquid is an example of a(n)

pure substance

homogeneous mixture

heterogeneous mixture

immiscible mixture

19.

1 point

The name for the compound with the formula CuBr2 would be written

copper(II) bromide.

copper(I) bromide.

copper bromine

copper(III)bromide.

20.

1 point

Avogadro's number is defined as the number of particles in

one mole of a substance.

one liter of a substance.

one gram of a substance.

one lilgram of a substance.

21.

1 point

Compared to less massive particles at the same temperature, more massive particles

move more quickly.

move more slowly.

are closer together.

are farther apart.

22.

1 point

Most halogens form compounds by

gaining an electron to form a negative ion.

losing an electron to form a positive ion.

losing protons

joining with both calcium and carbon.

23.

1 point

In which substance do the molecules have the strongest attractions to one another?

sugar, a solid.

hydrogen, a gas.

sulfuric acid, a liquid.

water a liquid.

24.

1 point

Each molecule of hydrochloric acid, HCl, contains one atom of hydrogen and

one atom of chlorine.

one atom of oxygen.

two atoms of chlorine.

two atoms of oxygen.

25.

1 point

A substance has a mass of 360 g and a volume of 7.5 mL. What is it's density?

2,700 g/ml

480 g/ml

270 g/ml

48 g/ml

26.

1 point

Which of the following is an example of a physical change?

dissolving salt in water.

cooking an egg

burning wood into charcoal

rusting iron

27.

1 point

Unlike a mixture, a pure substance has

atoms

molecules

a specific size

a fixed composition

28.

1 point

Formaldehyde, CH2O, and acetic acid, C2H4O2, have the same empirical formula but different

kinds of cations.

kinds of anions

kinds of atoms

molecuar formulas

29.

1 point

Oxygen’s atomic number is 8. This means that an oxygen atom has

eight neutrons in its nucleus.

a total of eight protons and neutrons.

eight protons in its nucleus.

a total of eight neutrons and electrons.

30.

1 point

A measure of the average kinetic energy of the particles in an object is called

thermal energy

kinetic energy

plasma

temperature

31.

1 point

Charles’s law relates the volume of a gas to it's

container

pressure

composition

temperature

32.

1 point

A compound is held together by

chemical bonds

gravity

physical bonds

magnetism

33.

1 point

The molar mass of potassium is approximately 39g/mol. What is the mass of 2.0 mol of potassium?

0.39g

0.78g

39g

78g

34.

1 point

The process of a liquid becoming a gas is called

sublimation

freezing

evaporation

condensation

35.

1 point

Alkali metels are extremely reactive because they

have very small atomic masses.

are not solid at room temperatures.

have one valence electron that is easily removed to form a positive ion.

have two valence electrons that form compounds with calcium and magnesium.

36.

1 point

Digesting food is an example of

physical change.

chemical change

change of state

buoyancy

37.

1 point

A protein is a polymer that is made of

simple sugars.

nitrogen and carbon dioxide

aminio acids

DNA

38.

1 point

Which statement about the atom's nucleus is correct?

The nucleus is made of protons and neutrons and has a negative charge.

the nucleus is made of protons and neutrons and has a positive charge.

The nucleus is made of electrons and has a positive charge.

The nucleus is made of electrons and has a negative charge.

39.

1 point

Which statement about noble gases is correct?

They form compounds with very bright colors.

They exist as single atoms rather than as molecules.

They are highly reactive with both metals and nonmetels.

They are extremely rare in nature.

40.

1 point

Which statement about the alkali metals is correct?

They are located in the left-most column of the periodic table.

They are extremely nonreactive.

They are usually gases.

They form negative ions with a 1- charge.

41.

1 point

Which of the following is not an example of a physical property?

freezing point

reactivity

boiling point

density

42.

1 point

The simplest organic compound is

aspirin.

table sugar

sea salt

methane

43.

1 point

An atom's mass number equals the number of

protons plus the number of electrons.

protons plus the number of neutrons.

protons

neutrons

44.

1 point

Matter is defined as anything that

can be seen and touched.

has mass and takes up space.

can be weighed.

contains kinetic energy.

45.

1 point

What method for determining buoyant force states that the buoyant force on an object in a fluid is an upward force equal to the weight of the fluid that the object displaces?

Archimedes' principle

Boyle's law

Charles's law

Gay-Lussac's law

46.

1 point

Elements that are found in the same group have the same number of

protons.

neutrons.

valence electrons.

protons and neutrons.

47.

1 point

Unlike a gas , a plasma

has no mass.

has no definite shape.

has no definite volume.

conducts electric current.

48.

1 point

A unified atomic mass unit is equal to

one-half the mass of a hydrogen atom.

one-fourth the mass of a lithium atom.

one-twelfth the mass of a carbon-12 atom.

one fifteenth the mass of a nitrogen-15 atom.

49.

1 point

The chemical symbol for sulfuric acid is H2SO4. How many atoms are contained in each molecule of sulfuric acid?

3

6

5

7

50.

1 point

Atoms often join so that each atom will have

an even number of electrons.

an outer most energy level that is full of electrons.

an equal number of protons and electrons.

more electrons than either protons or neutrons.