Q: A wooden object has a mass of 10.782 g and occupies a volume of 13.72 mL. What is its density, rounded to the correct number of significant figures?

$$7.9 \times 10$$^{-1}$$\ \text{g/mL}$$

Question 1

Which law explains why pure water always contains hydrogen and oxygen in a 1:8 ratio by mass, regardless of its source?

Accepted Answer

The law of constant composition

Question 2

A wooden object has a mass of 10.782 g and occupies a volume of 13.72 mL. What is its density, rounded to the correct number of significant figures?

Accepted Answer

$$7.9 	imes 10$$^{-1}$$\ 	ext{g/mL}$$

Question 3

Which of the following is the smallest and lightest subatomic particle?

Accepted Answer

Electron

Question 4

How many significant figures should be retained in the result of the calculation $$(11.13-2.6) 	imes 10^4$ \div (103.05 + 16.9) 	imes 10$$^{-6}$$?

Accepted Answer

2

Question 5

Which of the following numbers contains only non-significant zeros?

Accepted Answer

0.009

Question 6

What is the empirical formula for a compound that produces 6.32 mg CO$$_2$$ and 2.58 mg H$$_2O $$from 2.78 mg of ethyl butyrate (composed of C, H, and O)?

Accepted Answer

C$$_2H$_4O$

Question 7

Which element is a transition metal according to the periodic table provided?

Accepted Answer

Manganese

Question 8

A sample of CH$$_2F$_2$$ with a mass of 19 g contains how many atoms of fluorine?

Accepted Answer

$$2.2 	imes 10$$^{23}$$

Question 9

Which of the following molecular formulas is also an empirical formula?

Accepted Answer

C$$_2H$_6SO$

Question 10

What is the density of acetaminophen (C$$_8H$_9NO$_2) if a $$molecule occupies $$0.1858\ 	ext{nm}^3$$? (Express your answer in g/cm$$^3)$$

Accepted Answer

$$1.67\ 	ext{g/cm}^3$$

Question 11

Which of the following products is most likely to be the result of a combustion reaction?

Accepted Answer

H$$_2O$

Question 12

One million argon atoms is equal to how many moles of argon atoms (rounded to two significant figures)?

Accepted Answer

$$1.7 	imes 10$$^{-18}$$

Question 13

When the equation $$	ext{K} (s) + 	ext{H}_2	ext{O} (l) ightarrow 	ext{KOH} (aq) + 	ext{H}_2 (g) is $$balanced, what is the coefficient of H$$_2$$?

Accepted Answer

1

Question 14

Which element in the periodic table has 45 neutrons in its most common isotope?

Accepted Answer

Rhodium

Question 15

If barium reacts with a polyatomic ion to form Ba$$_3(X$$)$$_2$$, what is the most likely formula for the compound formed between sodium and X?

Accepted Answer

Na$$_2X$$

Question 16

How many electrons are associated with iron in iron(II) nitride?

Accepted Answer

26

Question 17

How many electrons are associated with an individual nitrogen atom in iron(II) nitride?

Accepted Answer

7

Question 18

In the periodic table, elements are arranged in:

Accepted Answer

Order of increasing atomic number

Question 19

What is the correct conversion for $$1\ 	ext{cm}^3 to$$ $$	ext{nm}^3$$?

Accepted Answer

$$10^{21}$$

Question 20

One mole of which compound contains the most atoms?

Accepted Answer

Al$$_2(SO$_4$$)$$_3$$

General Chemistry Exam 1 Study Guide: Matter, Measurement, Atoms, Molecules, and Stoichiometry

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