Question 1

Which of the following temperatures is the lowest? Convert each to Kelvin to compare: (A) The freezing point of water, (B) 5 $$^\circC$$, (C) 30 $$^\circF$$, (D) 280 K.

Accepted Answer

30 $$^\circF$$

Question 2

A laboratory sample has a density of 3.337 g/cm$$^3. $$What is this density in kg/m$$^3$$?

Accepted Answer

3337

Question 3

A factory produces 4335 pounds of ball bearings per week (5 days). Each ball bearing weighs 0.0113 g. How many ball bearings does the plant make in a single day? (Use proper scientific notation and significant figures.)

Accepted Answer

$$3.84 	imes 10^5$

Question 4

The width, length, and height of a shipping crate are 1.12 m, 1.25 m, and 0.83 m, respectively. What is the volume of the box, reported with the correct number of significant figures?

Accepted Answer

1.16

Question 5

1 picometer equals how many centimeters?

Accepted Answer

$$1 	imes 10$$^{-10}$$

Question 6

The gold foil experiment performed in Rutherford's lab led to which major scientific discovery?

Accepted Answer

Led to the discovery of the atomic nucleus

Question 7

Of the three types of radioactivity characterized by Rutherford, which are electrically charged?

Accepted Answer

$$\alpha-$$rays and $$\beta-$$rays

Question 8

Which atom has the largest number of neutrons?

Accepted Answer

argon-40

Question 9

Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties?

Accepted Answer

Ca, Sr

Question 10

Which of the following compounds would you expect to be ionic?

Accepted Answer

SrCl$$_2$$

Question 11

Which pair of elements is most apt to form an ionic compound with each other?

Accepted Answer

barium, bromine

Question 12

What is the correct name for MgF$$_2$$?

Accepted Answer

magnesium fluoride

Question 13

Which element forms an ion with the same charge as the ammonium ion?

Accepted Answer

potassium

Question 14

How many total electrons are in the O$$^{2-}$$ ion?

Accepted Answer

10

Question 15

Which of the following is a decomposition reaction?

Accepted Answer

NH$$_4Cl$$ $$\rightarrow NH$_3 + $$HCl

Question 16

The formula of nitrobenzene is C$$_6H$_5NO$_2. $$What is its molecular weight in g/mol?

Accepted Answer

123.11

Question 17

How many molecules of CH$$_4$$ are in 48.2 g of this compound? (Molar mass of CH$$_4 = 16.0 g/$$mol)

Accepted Answer

$$1.81 	imes 10$$^{24}$$

Question 18

How many atoms of nitrogen are in 10 g of NH$$_4NO$_3$$? (Molar mass = 80.0 g/mol)

Accepted Answer

$$1.5 	imes 10$$^{23}$$

Question 19

Lithium and nitrogen react to produce lithium nitride: $$6	ext{Li} (s) + 	ext{N}_2 (g) ightarrow 2	ext{Li}_3	ext{N} (s). $$How many moles of N$$_2$$ are needed to react with 0.550 mol of lithium?

Accepted Answer

0.0917

Question 20

In a reaction, 2.50 g of lithium and 2.50 g of nitrogen are reacted to form lithium nitride: $$6	ext{Li} (s) + 	ext{N}_2 (g) ightarrow 2	ext{Li}_3	ext{N} (s). $$What is the theoretical yield of lithium nitride in grams?

Accepted Answer

4.18

General Chemistry Practice Test 1 – Step-by-Step Study Guidance

Guida di studio - Domande di pratica

Study guide - Flashcard