Hesi a2 Chemistry Practice Test

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1

What are all the metric measurements composed of?

A. Metric prefix and a basic unit of measure

B. A significand and a metric prefix

C. A metric prefix and a coefficient

D. A coefficient a d a significand

A.

2

What is the most commonly used temperature scale in the scientific community?

A. Fahrenheit

B. Celsius and Centigrade

C. Kelvin

D. English temperature method

B.

3

The nucleus of an atom contains or is made up of which of the following?

A. Protons and electrons

B. Protons only

C. Protons and neutrons

D. Neutrons and electrons

C.

4

What is an atom that has a positive charge called

A. A cathode

B. A cation

C. An anode

D. An anion

B.

5

In the periodic table, what are the rows called?

A. Groups

B. Moles

C. Columns

D. Periods

D.

6

What is the atomic number?

A. Number of neutrons

B. Number of protons

C. Number of electrons

D. Number of isotopes

B.

7

Which if the following describes the atomic mass?

A. Mass of protons and electrons

B. Mass of neutrons and electrons

C. Average mass of that elements isotopes

D. Number of moles in a solution

C.

8

Chemical equations are written in which manner?

A. Product - - > Reactants

B. Reactants - - > Products

C. Reactants - - > Reactants

D. Products - - > Reactants

B.

9

What is the charge on potassium in the compound KCI?

A. - 1

B. +1

C. - 2

D. +2

B.

10

A catalyst is a substance that accelerates a reaction by which of the following?

A. Adding energy to the overall reaction

B. Increasing the amount of energy ended for the reaction to occur

C. Finding an alternate pathway for a reaction that requires less energy

D. Speeding up the overall reaction process

C.

11

Percent concentration of a solution is expressed as which of the following?

A. 100 parts per 100 dL

B. Parts per 100 parts

C. Parts of moles

D. Moles per 100 parts

B.

12

What will one liter of a one molar solution of any element contain?

A. The atomic mass in grams of that element

B. The atomic number in grams of that element

C. The atomic mass in liters of that element

D. The atomic number in liters of that element

A.

13

Chemical bonding is the bonding if which of the following?

A. One atom to another atom

B. One mole to another mole

C. A proton to an electron

D. One cation to another cation

A.

14

Which of the following describes an ionic bond?

A. It shares electrons

B. It does not share electrons

C. It is sometimes called a covalent bond

D. It is the strongest of all chemical binds

B.

15

The reaction 2C2H6 + 7O2 —> 4CO2 + 6H2O has a ratio of 2 parts ethane (C2H6) and 7 parts oxygen (O2). How many parts of ethane (C 2 H 6 ) will be needed to react with 21 parts of oxygen?

A. 3 parts of ethane (C 2 H 6 )

B. 6 parts if ethane (C 2 H 6 )

C. 9 parts if ethane (C 2 H 6 )

D. 14 parts of ethane (C 2 H 6 )

B.

16

What is the concentration of 58.5 g of NaC1 in 2 L of solution (atomic weights of each element are as follows: Na = 23 g/mol, C1 = 35.5 mol)?

A. 0.5 NaC1

B. 0.75 mol NaC1

C. 1 mol NaC1

D. 2 mol NaC1

A.

17

In a redox reactions, which of the following describes reduction?

A. It is the loss of electrons

B. It is the gain of protons

C. It is the loss of neutrons

D. It is the gain of electrons

D.

18

What are acids?

A. Hydrogen acceptors

B. Solution of high pH

C. Hydrogen donors

D. Amphoteric

C.

19

What is a benefit of waters ability to make hydrogen bonds?

A. Lack of cohesiveness

B. Low surface tension

C. Use as a nonpolar solvent

D. High specific heat

D.

20

What are bases or alkaline solutions?

A. Hydrogen acceptors

B. Solutions of low pH

C. Hydrogen donors

D. Amphoteric

A.

21

Chemical reactions in living systems proceed along catabolic pathways, and there tends to be an increase in which of the following?

A. Entropy

B. Enthalpy

C. Glucose

D. Glycogen

A.

22

What is a pH of 7?

A. Acidic

B. Basic

C. Neutral

D. Positive

C.

23

Which is the correct way to write Iodine (I) with an atomic mass of 131?

A. I131

B. I131

C. 131I

D. 131I

C.

24

What is the correct formula for magnesium?

A. MgC12

B. MgC1

C. Mg2C1

D. Mg2C12

A.

25

What is the weakest of all the intermolecular forces?

A. Dispersion

B. Dipole interactions

C. Hydrogen bonding

D. Covalent bonding

A.

26

Beta radiation is the emission of which of the following?

A. Large numbers of helium ions

B. An electron

C. High energy electromagnetic radiation

D. A product of the decomposition of a proton

B.

27

Which of the following describes carbohydrates?

A. They serve as fuel for the body

B. They are present in the DNA but not in RNA

C. They are the least abundant biomolecule

D. They cannot be stored in the body

A.

28

What are monosaccharides?

A. The simplest form of carbohydrates

B. The most complex for of carbohydrates

C. One form of a very complex fat

D. Artifical sweeteners such as saccharin

A.

29

Disaccharides are the joining together of which of the following?

A. Three to six monosaccharides

B. Two monosaccharides

C. A number of monosaccharides

D. A fat and a monosaccharide

B.

30

Glycolysis is one of the body's chemical pathways for which of the following?

A. Manufacturing glycogen

B. Building proteins

C. Producing fat

D. Metabolizing glucose

D.

31

Amino acids are the building blocks for which of the following?

A. Nucleic acids

B. Carbohydrates

C. Proteins

D. Lipids

C.

32

What is the union if two amino acids using a peptide bond called?

A. A dipeptide

B. A peptide

C. A monopeptide

D. A polypeptide

A.

33

Which of the following describes lipids?

A. They are a major source of fuel for the body immediately after a meal

B. They are stored for a source of fuel after carbohydrate depletion

C. They are comprised of glycerol and three fatty acids

D. They are metabolized by a pathway called glycolysis

B.

34

Which of the following describes DNA?

A. It is made of two strands of a ribose sugar-phosphate chain

B. It consists of one strand of deoxyribose sugar-phosphate chain

C. It consists of one strand of a ribosome sugar-phosphate chain

D. It is located solely in the mitochondria of the individual cell

B.

35

Use of the periodic table allows prediction of which of the following?

A. The properties of each of the elements

B. The charge of polyatomic ions

C. The number of isotopes in each element

D. The potential for discovery of new elemens

A.

36

How could water be boiled at room temperature?

A. By lowering the pressure

B. By increasing the pressure

C. By decreasing the volume

D. By raising the boiling point

A.

37

What is a combustion reaction?

A. It is endothermic

B. It substitutes one element for another

C. It always shares electrons

D. It is a reaction that involves oxygen

D.

38

What is KCI --> K + CI2 an example of?

A. Synthesis

B. Decomposition

C. Single replacement

D. Double replacement

B.

39

Iodine and carbon dioxide undergo sublimation at room temperature and atmospheric pressure. What is this process?

A. Changing from a gas to a liquid

B. Changing from a liquid to a gas

C. Changing from a solid to a liquid

D. Changing from a solid to a gas

D.

40

An experiment is performed to measure the temperature of boiling water at sea level. The actual boiling point is 104.6 C, 104.5 C, and 104.4 C. What term best describes this data?

A. Accurate

B. Precise

C. Variable

D. Equivalent

B.