Q: How many atoms are present in 10.0 grams of aluminum ($$\mathrm{Al}$$)? ($$M_{\mathrm{Al}} = 27.0\ \mathrm{g/mol}$$, $$N_A = 6.022 \times 10$$^{23}$$\ \mathrm{atoms/mol})$$

$$2.23 \times 10$$^{23}$$ atoms

Question 1

Which of the following is the correct prefix for $$10^{-6} in $$the metric system?

Accepted Answer

micro-

Question 2

How many significant figures are in the measurement 0.0045200 g?

Accepted Answer

6

Question 3

What is the correct chemical formula for aluminum sulfate?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 4

Which of the following ions has a $$2+$$ charge?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$}$$

Question 5

A neutral atom of $$^{37}\mathrm{Cl}$$ contains how many protons, neutrons, and electrons?

Accepted Answer

17 protons, 20 neutrons, 17 electrons

Question 6

Balance the following equation: $$\mathrm{C_2H_6} + \mathrm{O_2$} \rightarrow \mathrm{CO_2$} + \mathrm{H_2O}$$

Accepted Answer

$$2\mathrm{C_2H_6} + 7\mathrm{O_2$} \rightarrow 4\mathrm{CO_2$} + 6\mathrm{H_2O}$$

Question 7

Convert 5.00 kilometers to centimeters using dimensional analysis.

Accepted Answer

$$5.00 	imes 10^5$ cm

Question 8

How many moles are in 18.0 grams of water ($$\mathrm{H_2O}$$)? ($$M_{\mathrm{H_2O}} = 18.0\ \mathrm{g/mol})$$

Accepted Answer

1.00 mol

Question 9

How many atoms are present in 10.0 grams of aluminum ($$\mathrm{Al}$$)? ($$M_{\mathrm{Al}} = 27.0\ \mathrm{g/mol}$$, $$N_A = 6.022 	imes 10$$^{23}$$\ \mathrm{atoms/mol})$$

Accepted Answer

$$2.23 	imes 10$$^{23}$$ atoms

Question 10

If 4.00 g of hydrogen gas ($$\mathrm{H_2$}) $$reacts with excess oxygen, how many grams of water ($$\mathrm{H_2O}) $$are produced? ($$2\mathrm{H_2$} + \mathrm{O_2$} \rightarrow 2\mathrm{H_2O}$$, $$M_{\mathrm{H_2$}} = 2.00\ \mathrm{g/mol}$$, $$M_{\mathrm{H_2O}} = 18.0\ \mathrm{g/mol})$$

Accepted Answer

36.0 g

Question 11

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 12

What is the name of the compound $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 13

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of $$\mathrm{$$CO_2$$}$$. How many moles of $$\mathrm{$$CO_2$$}$$ are present?

Accepted Answer

0.500 mol

Question 14

Which of the following is the correct formula for magnesium nitrate?

Accepted Answer

$$\mathrm{Mg(NO_3$)_2}$$

Question 15

How many neutrons are in an atom of $$^{56}\mathrm{Fe} if $$the atomic number of Fe is 26?

Accepted Answer

30

Quiz 1 Study Guide: CH 1, 2 & 3 (General Chemistry)

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