Chemistry EOC Review

Question 1

How many atoms are in a chromium sample with a mass of 13 grams?

Accepted Answer

1.5 × 1023

Question 2

Silver has 47 protons in each atom. Which of the following also describes an atom of Ag?

Accepted Answer

It has 47 electrons

Question 3

The atomic number of an element indicates which of the following?

Accepted Answer

the number of protons in the atom

Question 4

How many moles of CH4 are contained in 96.0 grams of CH4?

Accepted Answer

6.00 moles

Question 5

What is the chemical formula for aluminum oxide?

Accepted Answer

Al2O3

Question 6

S8 (s) + 8O2 (g) → 8SO2 (g)

Accepted Answer

synthesis

Question 7

Which is included in the deﬁnition of a scientiﬁc theory?

Accepted Answer

a well-tested explanation of natural events

Question 8

Which of the following samples of sugar will dissolve fastest in a pitcher of lemonade?

Accepted Answer

5 g of granulated sugar in 20◦C lemonade

Question 9

When a sample of a gas is cooled, it condenses into a liquid. Which statement below is true?

Accepted Answer

The molecules move faster as a gas than they do as a liquid.

Question 10

How many grams of KCl are dissolved in 2.00 L of a 0.200 M solution of KCl?

Accepted Answer

29.8 g

Question 11

Hot chocolate cools from 90◦C to 80◦C, what happens to the molecules of the liquid?

Accepted Answer

Their rate of motion is decreasing

Question 12

Which of the following is a formula for a compound formed from sodium (Na) and oxygen (O)?

Accepted Answer

Na2O

Question 13

Which of the following statements best describes the current atomic theory?

Accepted Answer

Electrons exist as both wave and particle characteristics

Question 14

Which of the following is a conclusion that resulted from Rutherford's Gold Foil experiment?

Accepted Answer

The nucleus is very small and the atom is mostly empty space

Question 15

What is the percent mass of oxygen in acetone (C3H6O)?

Accepted Answer

27.6%

Question 16

A neutral atom has an outer shell electron conﬁguration of 2s22p6. Which group does it belong?

Accepted Answer

noble gases

Question 17

Which of the following occurs in an ionic bond?

Accepted Answer

Oppositely charged ions attract

Question 18

How many mL of a 6.0 M solution would be used to prepare 100.0 mL of a 1.0 M solution?

Accepted Answer

17 mL

Question 19

What is the electron conﬁguration for an atom of germanium at ground state?

Accepted Answer

[Ar] 4s23d104p2

Question 20

The element sulfur would be expected to have how many valence electrons?

Accepted Answer

6

Question 21

Which of the following explains why saltwater is considered a mixture?

Accepted Answer

Made of 2 or more substances retaining chemical properties.

Question 22

Which would most increase the rate at which S magnesium nitrate dissolves in a liquid solvent?

Accepted Answer

Breaking the crystals into smaller pieces

Question 23

Generally, how do atomic masses vary throughout the periodic table of the elements?

Accepted Answer

They increase from left to right and top to bottom.

Question 24

Which of the following elements has the smallest atomic radius?

Accepted Answer

Chlorine

Question 25

What is the name of the compound represented by the formula NO2?

Accepted Answer

Nitrogen dioxide

Chemistry EOC Review

Questions 25

Chemistry EOC Review

Questions 25