Quiz Standard 1 Answer Key

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Explanation:
The correct classification is double recplacement reaction. The lead and the potassium replace each other making this a double replacement reaction.

14)

NaCl + H₂SO₄ ---> Na₂SO₄ + HCl

Balance the double replacement chemical reaction.

A)	NaCl + H₂SO₄ ---> Na₂SO₄ + HCl

B)	2NaCl + H₂SO₄ ---> Na₂SO₄ + 2HCl

C)	3NaCl + 2H₂SO₄ ---> 2Na₂SO₄ + 3HCl

D)	2NaCl + 2H₂SO₄ ---> 2Na₂SO₄ + 2HCl

E)	None of the above

Explanation:_The_correctly_balanced_double_replacement_reaction_is_2NaCl_+_H_2_SO_4__--->_Na_2_SO_4'>Explanation:
The correctly balanced double replacement reaction is 2NaCl + H₂SO₄ ---> Na₂SO₄ + 2HCl. This is the only equation in which the number of atoms is equal on both sides the equation.

15)

NI₃ is an extremely sensitive contact explosive.

Use IUPAC rules to name this compound.

A)	nitrogen iodide

B)	nitrogen triiodide

C)	mononitrogen iodide

D)	mononitrogen triiodide

E)	None of the above

Explanation:_2'>Explanation:
NI₃ would be called nitrogen triiodide. The nitrogen, being the first element with only one atom, does not require a prefix. Iodine has the ending changed to "ide" and there are three, so a prefix of "tri" is added.

16)

reactant → product

If there are 2 grams of product produced by the chemical reaction, how many grams of reactant were consumed?

0 grams

1 gram

2 grams

4 grams

E)	None of the above

Explanation:_10_kg'>Explanation:
2 grams of reactants would be consumed by the chemical reaction. The mass of the reactants equals the mass of the products. This is the Law of Conservation of Matter. However much is reacted must be produced.

17)

A + B + C → D + E

Describe the mass of the reactants and products given the balanced chemical reaction.

A)	The mass of the products is 2/3 that of the reactants.

B)	The mass of the reactants equals the mass of the products.

C)	The mass of the reactants is less than the mass of the products.

D)	The mass of the reactants is greater than the mass of the products.

E)	None of the above

Explanation:_2_→_2,1'>Explanation:
The mass of the reactants equals the mass of the products. This is the Law of Conservation of Matter. Do not be fooled by the larger numbers of reactants.

18)

4Fe + 3O₂ → 2Fe₂O₃

Iron combines with oxygen to form rust. Given the chemical reaction, how many grams of 4Fe + 3O₂ would produce 10 kg of rust?

7 kg

10 kg

30 kg

70 kg

E)	None of the above

Explanation:
10 kg of 4FE + 3O₂ would be required to produce 10 kg of rust. This is the Law of Conservation of Matter.

19)

K₂O

Use IUPAC nomenclature rules to properly identify this compound.

A)	potassium oxide

B)	dipotassium oxide

C)	potassium (I) oxide

D)	dipotassium monoxide

E)	None of the above

Explanation:
The correct name is potassium oxide. It is a binary ionic compound, so no prefixes are used. Since potassium is a representative metal with only one possible charge, no roman numerals are used.

20) Hydrogen peroxide is a chemical used to clean bacteria out of cuts. It does this through creating germ-eating oxygen in this decomposition reaction. What set of coefficients, respectively, balance this equation?

H₂O₂ → H₂O + O₂

1 → 1,2

2 → 2,1

2 → 2,2

4 → 4,1

E)	None of the above

Explanation:
2 → 2,1 Start by balancing the O, by putting a 2 in front of H₂O (this gives an even number of O). This creates a total of 4 O on the product side and 4 H. To balance the H, put a coefficient of 2 on the reactant side.

21)

http://www.usatestprep.com/modules/gallery/files/17/1752/1752.gif

The correct chemical formula for magnesium sulfide is

Mg₂S

Mg₃S₄

MgS

MgS₂

E)	None of the above

Explanation:
The correct chemical formula for magnesium sulfide is MgS. This is an ionic compound. The Mg ion has a charge of 2+, the sulfide a charge of 2-, so they bond in a 1:1 ratio.

22)

Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)

This chemical equation represents a ______________ reaction.

synthesis

B)	decomposition

C)	neutralization

D)	single replacement

E)	None of the above

Explanation:
The type of reaction represented by the balanced chemical equation is single replacement reaction. In this case, one metal, iron (Fe), replaces another metal, copper (Cu) in copper sulfate (CuSO₄).

23) Carbon and flourine combine covalently to form a binary compound. What is the formula of the compound with the name carbon tetrafluoride?

C₄F

C₄F₄

CF₄

E)	None of the above

Explanation:
When writing the formula for covalent compounds, remember that the name tells you the number of atoms for each. Carbon, having no prefix, is one and flourine has a prefix of four. So, the correct answer is CF₄.

24)

Data Analysis

Elements	Density
Aluminum	2.698 g/mL
Calcium	1.54 g/mL
Iron	7.8738 g/mL
Silicon	2.3296 g/mL

Sanjay is learning about the elements that make up Earth’s crust. Ms. Richards, his Earth science teacher, gives him an element and asks him to determine which element from Earth’s crust it is. She also provides Sanjay with this table. Sanjay weighs the element and finds that it has a mass of 17.98 g. By placing the element in water, he determines the volume of the substance to be 2.2835 mL.

Based on the table from Ms. Richards, what element from Earth’s crust did Ms. Richards gave to Sanjay?

iron

calcium

aluminum

silicon

E)	None of the above

Explanation:
By using the table from Ms. Richards, Sanjay can determine what element from Earth’s crust he has by finding its density. To find density, Sanjay must use the formula density =

mass

volume

. The equation he will use is density =

17.98 g

2.2835 mL

. Therefore, the density of this element is 7.8738

. Based on the table, the element with a density of 7.8738

is iron, which is the element from Earth’s crust Ms. Richards gave to Sanjay.

25) The law of conservation of matter states that during a chemical reaction, the amount of matter

A)	increases.

B)	decreases.

C)	disappears.

D)	stays the same.

E)	None of the above

Explanation:
The law of conservation of matter says that matter always stays the same during chemical reactions. Physical or chemical changes result in matter being converted to other forms.

26)

8Fe + S₈ --> 8FeS

What type of chemical reaction is happening here?

synthesis

B)	decomposition

C)	single replacement

D)	double replacement

E)	None of the above

Explanation:
This is a synthesis reaction. All synthesis reactions end up with one product being formed from two or more reactants.

27)

Common Metals

Name	Melting Point	Density (g/cm³)
Zinc	419.53 ^oC	7.134
Nickel	1455^oC	8.912
Copper	1084.62^oC	8.96
Silver	961.78^oC	10.501
Gold	1064.18^oC	19.282

Determine the identity of a cube of metal that measures 1.5 cm on each side and has a mass of 35.45g.

Gold

Nickel

Silver

Zinc

E)	None of the above

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