Q: How many atoms are in 2.00 mol of oxygen gas ($$\text{O}_2$$)?

$$2.41 \times 10$$^{24}$$ atoms

Q: Which derived SI unit is used to measure density?

$$\text{kg}\cdot\text{m}^{-3}$$

Question 1

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A salad with lettuce, tomatoes, and cucumbers

Question 2

Which SI unit is used to measure the amount of substance, and what is its symbol?

Accepted Answer

Mole, mol

Question 3

A student measures the mass of a sample as 12.30 g. How many significant figures are in this measurement?

Accepted Answer

4

Question 4

Convert 5.0 km to meters using dimensional analysis.

Accepted Answer

$$5.0 	imes 10^3$ m

Question 5

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

Accepted Answer

Rutherford gold foil experiment

Question 6

Given the isotope notation $$^{14}_{6}	ext{C}$$, what does the number 14 represent?

Accepted Answer

Mass number

Question 7

Which element is located in period 3, group 2 of the periodic table?

Accepted Answer

Magnesium

Question 8

How many atoms are in 2.00 mol of oxygen gas ($$	ext{O}_2$$)?

Accepted Answer

$$2.41 	imes 10$$^{24}$$ atoms

Question 9

Which of the following is an ionic compound?

Accepted Answer

NaCl

Question 10

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

CH$$_2O$$

Question 11

What is the molecular formula of a compound with an empirical formula of CH$$_2O $$and a molar mass of 180 g/mol?

Accepted Answer

C$$_6H$_{12}O$_6$$

Question 12

Which of the following is the correct name for the organic compound CH$$_3CH$_2OH$$?

Accepted Answer

Ethanol

Question 13

Balance the following equation: $$	ext{C}_2	ext{H}_6 + 	ext{O}_2 ightarrow 	ext{CO}_2 + 	ext{H}_2	ext{O}. $$What is the coefficient for $$	ext{O}_2$$?

Accepted Answer

7

Question 14

In a reaction, 10.0 g of reactant A produces 8.0 g of product B. If the theoretical yield is 10.0 g, what is the percent yield?

Accepted Answer

$$80\%$$

Question 15

A student mixes 50.0 g of NaCl with 100.0 g of water. Which classification best describes the resulting mixture?

Accepted Answer

Homogeneous mixture

Question 16

Which derived SI unit is used to measure density?

Accepted Answer

$$	ext{kg}\cdot	ext{m}^{-3}$$

Question 17

Which statement about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties

Question 18

How many moles are in 36.0 g of water ($$	ext{H}_2	ext{O}$$)?

Accepted Answer

2.00 mol

Question 19

Which of the following best describes the difference between molecular and ionic compounds?

Accepted Answer

Molecular compounds are formed from only nonmetals; ionic compounds are formed from metals and nonmetals

Exam #1 Study Guide: Matter, Atomic Structure, Compounds, and Chemical Reactions

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