Chemistry Exam 1 Flashcards

How many moles of carbon dioxide are in 211 g of carbon dioxide?

929 mol of CO2

0.209 mol of CO2

4.79 mol of CO2

167 mol of CO2

Which compound has the greatest number of valence electrons?

H2S

H2O

NCl3

CF4

All of the molecules have the same number of valence electrons.

What is the mass of 3.81 mol of PH3?

3.81 g

130. g

34.0 g

0.112 g

8.92 g

A balanced chemical equation tells the number of ________ of each reactant that combine and the number of ________ of each product formed.

moles; moles

grams; moles

grams; grams

moles; grams

Which chemical formula is correct?

K2CN

Ag(CH3CO2)2

Mg(OH)2

MgHCO3

More than one of the formulas is correct.

Beaker A contains 1 mole of iron atoms, and Beaker B contains 1 mole of lead atoms. Which statement concerning these two samples is known with certainty?

Beakers A and B contain equal masses of atoms.

Beakers A and B contain samples with the same molar mass.

Beakers A and B contain an equal number of atoms.

Beakers A and B contain an equal volume of atoms.

Which one is not a pure substance?

copper metal

Water

sodium chloride

Apple juice

gold

Which pair of elements will form an ionic compound?

Copper and iron

Sulfur and oxygen

Iron and chlorine

Bromine and oxygen

A patient's urine sample has a density of 1.02 g/mL. If 1250 mL of urine was excreted by the patient in one day, what mass of urine was eliminated?

1.28 kg

1275 g

128 g

1225 g

Which of the following compounds is not classified as covalent?

SF6

MgCl2

PBr3

CH4

None of the choices are correct.

If a piece of rock has a volume of 0.73 L and a mass of 1524 g, what is the density of the rock in g/mL?

2.1 × 103 g/mL

4.8 × 10–4 g/mL

2.1 g/mL

0.48 g/mL

2.088 g/mL

When 4.870 × 103 is correctly converted to its standard form the number becomes ________.

0.004870

0.00487

0.0004870

4870.

4870

The correct name for Ag2O is ________.

silver (I) oxide

silver oxide

disilver oxide

silver (II) oxide

When forming ions, metals typically do which of the following?

Gain electrons to form anions

Lose electrons to form positively charged ions

Lose electrons to form negatively charged ions

Gain protons to form cations

How many moles of sulfur trioxide are formed from 3 moles of sulfur dioxide using the given balanced equation?
2 SO2 + O2 → 2 SO3

1 mol of SO3

3 mol of SO3

2 mol of SO3

5 mol of SO3

6 mol of SO3

When forming ions, metals typically do which of the following?

Gain electrons to form anions

Lose electrons to form positively charged ions

Lose electrons to form negatively charged ions

Gain protons to form cations

Which element is chemically similar to lithium?

Sulfur

Potassium

Iron

Magnesium

Lanthanum

Which element is an s block element?

Ar

He

SLa

None of these elements is an s block element.

Which reaction is a double displacement reaction?

2 H2 + O2 → 2 H2O3

Mg + Fe2O3 → 2 Fe + 3 MgO

3 Ca(OH)2 + Al2(SO4)3 → 3 CaSO4 + 2 Al(OH)3

2 KBr + Cl2 → 2 KCl + Br2

Which element is most likely to be a good conductor of electricity?

Ar

O

F

Ni

N

Which statement concerning the ion Li+ is correct?

Li+ has two total electrons.

Li+ has an octet of electrons in its valence shell

.Li+ is formed when a lithium atom gains one proton.

Li+ is formed when a lithium atom gains one electron.

Which element has the following orbital diagram?
1s 2s 2p

C

O

N

Li

Which statement best explains the basis for the octet rule?

Atoms are most stable with eight protons in their nucleus.

Atoms lose, gain, or share electrons to become a stable, noble gas.

Atoms are most stable when they have eight bonds.

Atoms are most stable with eight electrons in their valence shell and the electron configuration of a noble gas.

Carry out the following calculation and report the answer using the proper number of significant figures: 38.001 + 10.1

48.101

48.10

48.1

48.2

Carbon tetrachloride has ________ valence electrons.

8 (eight)

40 (forty)

32 (thirty-two)

24 (twenty-four)4 (four)