Chemistry Regents Review

Question 1

Which unit is used to express the pressure of a gas?

Accepted Answer

pascal

Question 2

What element has atoms that can bond to each other in rings and networks?

Accepted Answer

carbon

Question 3

When dissolved in water, an Arrhenius base yields

Accepted Answer

hydroxide ions

Question 4

In the formula XF2, the element represented by X can be classified as a

Accepted Answer

Group 2 metal

Question 5

Which compounds can be classified as electrolytes?

Accepted Answer

organic acids

Question 6

What is the most likely electronegativity value for a metallic element?

Accepted Answer

1.3

Question 7

Which nuclear emission has the greatest penetrating power?

Accepted Answer

gamma radiation

Question 8

Which atom in the ground state has an outermost electron with the most energy?

Accepted Answer

Cs

Question 9

Which list include elements with the most similar chemical properties?

Accepted Answer

O,S,Se

Question 10

Which electron configuration represents a selenium atom in an excited state?

Accepted Answer

2-7-18-7

Question 11

Systems in nature tend to undergo changes toward

Accepted Answer

lower energy and lower entropy

Question 12

A mixture of sand and table salt can be separated by filtration because the substances differ

Accepted Answer

in solubility in water

Question 13

According to one acid base theory water acts as a

Accepted Answer

base because it accepts an H+

Question 14

Which compound is soluble in water?

Accepted Answer

Na2S

Question 15

The elements of the Period Table are arranged in order of increasing

Accepted Answer

atomic number

Question 16

According to the kinetic molecular theory, the particles of an ideal gas

Accepted Answer

are separated by great distances compared to their size

Question 17

An atom of lithium-7 has an equal number of

Accepted Answer

electrons and protons

Question 18

Energy is release during the fission of Pu-239 atoms as a result of the

Accepted Answer

conversion of matter to energy

Question 19

Which particle has the least mass?

Accepted Answer

beta particle

Question 20

Which sample of matter is classified as a substance?

Accepted Answer

ammonia

Question 21

The temperature of a sample of matter is the measure of the

Accepted Answer

average kinetic energy of its particles

Question 22

A gas changes to a solid during

Accepted Answer

saponification

Question 23

What type of chemical reaction is this? sodium chlorate--> sodium chloride + oxygen

Accepted Answer

decomposition

Question 24

Which atom has the weakest attraction for electrons in a chemical bond?

Accepted Answer

a calcium atom

Question 25

Which element has the chemical properties that are most similar to fluorine?

Accepted Answer

chlorine

Question 26

As a result of the gold foil experiment it was concluded that an atom

Accepted Answer

contains a small, dense nucleus

Question 27

What class of compounds contains at least one element from Group 17 of the Periodic Table?

Accepted Answer

halide

Question 28

A molecule of an unsaturation hydrocarbon must have

Accepted Answer

at least one multiple carbon-carbon bond

Question 29

What energy conversion occurs in an electrolytic cell?

Accepted Answer

chemical to electrical

Question 30

Every chlorine atom has

Accepted Answer

an atomic number of 17

Question 31

What compound has the smallest percent composition by mass of chlorine?

Accepted Answer

KCl

Chemistry Regents Review

Questions 31

Chemistry Regents Review

Questions 31