Question 1

Which of the following is a chemical property of matter?
A)color
B)density
C)freezing point
D)flammability

Accepted Answer

Flammability is a chemical property because it describes how a substance reacts with oxygen to undergo combustion and form new substances with different properties. Color, density, and freezing point are physical properties that describe the characteristics of a substance without changing its chemical composition.

Question 2

The limit of physical subdivision of pure H₂O is _____ . A)the atom B)the molecule C)the element D)a proton

Accepted Answer

B

Question 3

Homoatomic pure substances are known as _____ .
A)protons
B)elements
C)compound
D)molecules

Accepted Answer

Homoatomic means consisting of only one type of atom. Therefore, these substances are elements. Choice A is incorrect because protons are particles found within the nucleus of an atom, not a substance. Choice C is incorrect because compounds consist of different types of atoms bonded together, whereas homoatomic substances only have one type of atom. Choice D is incorrect because molecules refer to two or more atoms chemically bonded together, whereas homoatomic substances only have one type of atom.

Question 4

Which of the following substances are composed of heteroatomic molecules?
A)an iron nail
B)oxygen
C)copper wire
D)water

Accepted Answer

Water is composed of heteroatomic molecules (H2O), meaning it contains more than one type of atom. An iron nail, copper wire, and oxygen are all composed of only one type of atom and are therefore not heteroatomic.

Question 5

Table salt,NaCl is best classified as a(n)_____ .
A)compound
B)element
C)homogeneous mixture
D)heterogeneous mixture

Accepted Answer

Table salt, NaCl, is a compound because it is made up of two different elements (sodium and chlorine) that are chemically bonded in a fixed ratio. It is not a homogeneous or heterogeneous mixture because it is a pure substance with a specific chemical composition. It is not an element because it is made up of more than one type of atom.

Question 6

Which of the following represents a physical change in matter?
A)A substance solidifies at 443 K.
B)A substance produces a gas and a solid when heated.
C)A substance burns when heated.
D)A substance changes color when exposed to air.

Accepted Answer

A substance solidifying is a physical change because the state of matter is changing from a liquid to a solid without a chemical reaction occurring.

Question 7

A molecule represented by O-O-O must be classified as
A)homoatomic and polyatomic.
B)homoatomic and monoatomic.
C)heteroatomic and polyatomic.
D)heteroatomic and monoatomic.

Accepted Answer

The molecule O-O-O, which consists of three oxygen atoms bonded together, is homoatomic because it is made up of atoms of the same element (oxygen) and polyatomic because it contains more than one atom.

Question 8

Two pure substances A and B react to form a new pure substance C.From this,we may conclude that
A)A and B are both elements
B)C is a compound,A and B may or may not be elements
C)C is an element,A and B are compounds
D)A,B,and C are all compounds

Accepted Answer

If A and B react to form a new substance C, then the resulting substance C must be a compound, as it is formed from the combination of two or more elements or compounds. A and B could be either elements or compounds themselves, and there is no information given in the statement to determine their identity. Therefore, the only conclusion we can draw is that C is a compound.

Question 9

After heating,a pure substance,A,is found to produce both B and C.What can be said about the substance A?
A)It is an element
B)It is a compound
C)It is either an element or compound
D)Impossible to predict

Accepted Answer

A pure substance that produces more than one type of substance upon heating is a compound, as elements cannot be broken down into simpler substances by chemical means.

Question 10

Which of the following is an example of a homogeneous mixture?
A)NaOH solution
B)mortar (mixture of water,sand and cement)
C)vinegar and oil salad dressing
D)more than one response is correct

Accepted Answer

A NaOH solution is a homogeneous mixture because the solute (NaOH) is evenly distributed throughout the solvent (water).

Question 11

The mass of an object is
A)the force between the object and the earth.
B)a measure of the amount of matter in the object.
C)the amount of space the object occupies.
D)depends on the location of the object on the earth.

Accepted Answer

The mass of an object is a measure of the amount of matter in the object. It is often confused with weight, which is the force of gravity acting on the object. Mass is a fundamental property of an object and does not depend on its location or the gravitational field it is in.

Question 12

Which of the following terms correctly applies to a molecule of CO₂? A)triatomic,heteroatomic B)polyatomic,diatomic C)triatomic,homoatomic D)diatomic,heteroatomic

Accepted Answer

The molecule COS consists of three different atoms (carbon, oxygen, and sulfur), making it triatomic because it has three atoms, and heteroatomic because those atoms are not all the same element.

Question 13

The fact that gold does not corrode is a ______ property
A)physical
B)personal
C)real
D)chemical

Accepted Answer

The fact that gold does not corrode is a chemical property because it relates to how gold reacts (or does not react) with its environment, specifically its resistance to oxidation and corrosion.

Question 14

Which of the following is a physical property of matter?
A)it does not burn
B)produces a gas when placed in an acid
C)freezes at -10$\degree$F
D)the surface turns black in air

Accepted Answer

Freezing at a specific temperature is a physical property of matter. A and D describe chemical properties, while B describes a chemical reaction.

Question 15

The weight of an object is
A)a measure of the gravitational force pulling the object toward the earth.
B)equal to the mass of the matter in the object.
C)a measure of the space occupied by the object.
D)the same at any location on the earth.

Accepted Answer

The weight of an object is a measure of the gravitational force pulling the object toward the earth. This force depends on the mass of the object and the acceleration due to gravity at that location.

Question 16

As two clear liquid solutions are thoroughly mixed,a red solid forms.This change is most likely _____ .
A)physical.
B)chemical.
C)neither chemical nor physical.
D)both chemical and physical.

Accepted Answer

The formation of a new substance (the red solid) indicates a chemical change, rather than a physical change.

Question 17

Any two objects are attracted to each other by _____ .
A)gravity
B)electrostatic forces
C)magnetism
D)all of them

Accepted Answer

Gravity is the attractive force between any two objects with mass. Electrostatic forces are only present between charged particles, and magnetism is the attractive force between magnets or magnetic objects. Therefore, the best choice is A, gravity.

Question 18

The melting of ice to liquid water is correctly classified as
A)a chemical change.
B)a physical change.
C)both a chemical and a physical change.
D)neither a chemical nor physical change.

Accepted Answer

The melting of ice to liquid water is a physical change because it does not result in a new substance being formed. The water molecules remain the same, but their arrangement has changed from solid (ice) to liquid.

Question 19

How is the weight of an object influenced when the gravitational force on the object is increased?
A)it decreases
B)it increases
C)it is unchanged
D)it equals the mass

Accepted Answer

Weight is directly proportional to the gravitational force acting on an object. As the gravitational force increases, the weight of the object also increases. This is because weight is defined as the force with which an object is pulled towards the center of the Earth, and this force is directly proportional to the gravitational force acting on the object.

Question 20

The limit of chemical subdivision of an element is the _____ .
A)atom
B)molecule
C)proton
D)compound

Accepted Answer

The limit of chemical subdivision of an element is the atom. An atom is the smallest unit of matter that retains the chemical properties of an element. A molecule is a combination of two or more atoms, and a compound is a substance composed of two or more different elements. A proton is a subatomic particle that is found in the nucleus of an atom. Therefore, the best choice is A.

Quiz 1: Matter, measurements, and Calculations

Which of the following is a chemical property of matter?

The limit of physical subdivision of pure H₂O is _____ .

Homoatomic pure substances are known as _____ .

Which of the following substances are composed of heteroatomic molecules?

Table salt,NaCl is best classified as a(n) _____ .

Which of the following represents a physical change in matter?

A molecule represented by O-O-O must be classified as

Two pure substances A and B react to form a new pure substance C.From this,we may conclude that

After heating,a pure substance,A,is found to produce both B and C.What can be said about the substance A?

Which of the following is an example of a homogeneous mixture?

The mass of an object is

Which of the following terms correctly applies to a molecule of CO₂?

The fact that gold does not corrode is a ______ property

Which of the following is a physical property of matter?

The weight of an object is

As two clear liquid solutions are thoroughly mixed,a red solid forms.This change is most likely _____ .

Any two objects are attracted to each other by _____ .

The melting of ice to liquid water is correctly classified as

How is the weight of an object influenced when the gravitational force on the object is increased?

The limit of chemical subdivision of an element is the _____ .