Question 1

Which of the following statements best describes the Law of Conservation of Mass as demonstrated in a closed chemical reaction?

Accepted Answer

The total mass of the reactants equals the total mass of the products.

Question 2

Which postulate of Dalton’s Atomic Theory was later proven incorrect by the discovery of isotopes?

Accepted Answer

Atoms of a given element are identical in mass and properties.

Question 3

A sample of matter has a definite volume but no definite shape. Which phase of matter does this describe?

Accepted Answer

Liquid

Question 4

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

Accepted Answer

Sand and iron filings

Question 5

Which of the following is a chemical change?

Accepted Answer

Burning wood

Question 6

Convert a temperature of $$25\ ^\circ \mathrm{C} to $$Kelvin.

Accepted Answer

$$298\ \mathrm{K}$$

Question 7

A metal cube has a mass of $$54.0\ \mathrm{g}$$ and a volume of $$18.0\ \mathrm{cm}^3. $$What is its density?

Accepted Answer

$$3.00\ \mathrm{g/cm}^3$$

Question 8

Which of the following numbers has three significant figures?

Accepted Answer

0.00450

Question 9

Which metric prefix represents $$10^{-3}$$?

Accepted Answer

milli-

Question 10

Which of the following is an intensive property?

Accepted Answer

Density

Question 11

Which experiment led to the discovery of the nucleus in the atom?

Accepted Answer

Rutherford gold foil experiment

Question 12

An atom has an atomic number of 17 and a mass number of 37. How many neutrons does it have?

Accepted Answer

20

Question 13

Calculate the average atomic mass of an element with two isotopes: $$^{10}\mathrm{B} (19.9$$%, mass = 10.012 u) and $$^{11}\mathrm{B} (80.1$$%, mass = 11.009 u).

Accepted Answer

$$10.81\ \mathrm{u}$$

Question 14

Which group on the periodic table is known as the alkali metals?

Accepted Answer

Group 1

Question 15

How many atoms are in $$2.00\ \mathrm{mol} of $$carbon?

Accepted Answer

$$1.20 	imes 10$$^{24}$$

Question 16

Which of the following is NOT a form of energy?

Accepted Answer

Mass

Question 17

What is the SI unit of energy?

Accepted Answer

Joule

Question 18

Which region of the electromagnetic spectrum has the shortest wavelength?

Accepted Answer

Gamma rays

Question 19

Which of the following correctly relates the frequency $$(
u)$$, wavelength $$(\lambda)$$, and speed of light $$(c)$$ for electromagnetic waves?

Accepted Answer

$$c = \lambda 
u$$

Question 20

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number $$(l)$$

CHEM 1311 Test 1 Review – Step-by-Step Study Guidance

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