Free Printable Chemistry Unit 7 Review

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Chemistry Unit 7 Review

Total questions: 38

Worksheet time: 1hrs 3mins

Name

Class

Date

Which formula below is rearranged correctly for frequency?

$c=\lambda v$

$v=\frac{\lambda}{c}$

$v=\frac{c}{\lambda}$

$v=c\lambda$

What formula calculates the energy of a photon?

$c=\lambda v$

$\lambda=\frac{c}{v}$

$E=hv$

$v=\frac{c}{\lambda}$

Light represent by arrow B. is best described as...

Reflected

Absorbed

Transmitted

Refracted

If most of the light is transmitted, what is the color of the object?

Blue/Purple

Red/Orange

Green/Yellow

Blue/Green

When using this formula: $c=\lambda v$ what units can you use? Select the ones that apply.

GHz

The frequency of violet light is 7.5x10¹⁴Hz. What is its wavelength?

4.0x10^-7 m

4.0x10⁷ m

2.25x10²³m

2.25x10²³ Hz

Violet light has a wavelength of

4.10 x 10^-7m. What is the frequency?

1.23 x 10^-3 Hz

7.31 x 10¹⁴ Hz

1.37 x 10¹² Hz

3.0 x 10⁸ Hz

What is Planck's Constant (h)?

h = 6.626x10^-34Js

h = 6.626x10 ³⁴J/s

h= 3.0x10⁸ ms

h = 3.0x10⁸ m/s

What is the energy of a photon with a frequency of 5x10¹⁴ Hz?

2.5x10^-19 J

3.0x10^-19 J

3.3x10^-19 J

4.5x10^-19 J

10.

Which of the following has the smallest wavelength?

Blue

Yellow

Red

11.

As wavelength goes down, the energy per photon goes....

down

stays the same

12.

What is the molarity of 4.00 g of NaCl (MM=58.45 g/mol) in 3.8 L of solution?

0.018 M

0.0011 M

1.052 M

0.062 M

13.

How many moles of solute are dissolved in 125.0 mL of 5.00 M

0.625 mol

625 mol

25 mol

0.04 mol

14.

Which solution would have the greatest absorbance?

1 M

3 M

3.1 M

2.5 M

15.

How many grams of AgNO₃ (molar mass = 169.87 g/mol) are in 250 mL of a 0.125 M.

0.03g

0.5g

5.3g

84.9g

16.

How many mL of stock solution of 2M NaCl do you need to prepare 100 mL of 0.150M NaCl? (dilution solve for V₁)

7.5 mL

15 mL

1333 mL

200 mL

17.

A solution is made by dissolving 0.50 mole of NaCl in enough water to give a final volume of 400.0 mL. What is the molarity of the solution?

0.10 M

0.40 M

1.25 M

2.33 M

18.

What is the molarity of a solution made by diluting 26.5 mL of 6.00 M HNO₃ to a volume of 250 mL?

15.9 M

0.636 M

0.642 M

1.59 M

19.

What is the phase of AgCl(?)

20.

Na₂CrO₄

soluble

insoluble

slightly soluble

21.

When Fe³⁺ and S^2- are combined the compound formed will be

soluble

insoluble

slightly soluble

22.

Ca(OH)₂

soluble

slightly soluble

insoluble

23.

Which is the correct net ionic equation when AgNO₃ and CaCl₂ are combined.

Ca²⁺(aq) + 2Cl^- (aq) → CaCl(s)

Ag⁺(aq) + Cl^- (aq) → AgCl(s)

Ag + Cl → AgCl

Ag⁺+ Ca²⁺ →Ag₂Ca (s)

24.

In this equation,
CuCl₂ + NaOH → Cu(OH)₂ + NaCl
Which product is insoluble?

copper(II) hydroxide

sodium chloride

sodium hydroxide

copper(II) chloride

25.

What are the spectator ions in this reaction?

CuCl₂(aq) + NaOH(aq) → Cu(OH)₂(s) + NaCl(aq)

Cu²⁺ and OH^-

Na²⁺ and Cl^2-

Na⁺ and Cl^-

Na⁺ and OH^-

26.

what is the net ionic equation for the reaction
2NaOH(aq) + CuCl₂(aq) → 2NaCl(aq) + Cu(OH)₂(s)

2OH^–(aq) + Cu²⁺(aq) → Cu(OH)₂(s)

2OH^–(aq) + Na⁺(aq) → NaOH(s)

2Cl^–(aq) + Cu²⁺(aq) → CuCl₂(s)

Cl^–(aq) + Na⁺(aq) → NaCl(s)

27.

(honors) Using the graph, what is the concentration of a solution that has an absorbance of 0.067?

0.511 M

0.532 M

0.126 M

0.504 M

28.

(honors) Using the graph, what would be the absorbance of a solution that has a concentration of 1.14 M?

1.14

0.133

0.144

0.126

29.

If a solution is red, which wavelength would be a BAD choice if you want to measure its absorbance.

410 nm

450 nm

535 nm

680 nm

30.

Solution D has an absorbance of 0.781. What is the best estimate of concentration for solution D.

0.1 M

0.95 M

0.6 M

0.3 M

31.

Which of the following combination will produce a precipitate?

NaCl + KOH

Na₂CrO₄ + LiNO₃

Na₃PO₄ + Ba(OH)₂

Na₂SO₄ + (NH₄)₂S

32.

What is the molar mass of aluminum chloride: AlCl₃

62.4 g/mol

132 g/mol

133.5 g/mol

97.9 g/mol

33.

What is the volume of a solution with 0.01 moles of solute and a concentration of 0.5 M

20 mL (0.02 L)

200 mL (0.200 L)

5 mL (5000 L)

50 mL (0.05 L)

34.

The image shows two purple solution of KMnO₄. Which solution absorbs more purple light?

Solution A

Solution B

A trick question! Purple objects do not absorb purple light.

35.

What electrolytes are produced when Ca(NO₃)₂ is dissolved in water?

Ca²⁺ and 2NO₃^-

Ca²⁺ and NO₃^-

Ca and NO₃

No electrolytes produced. This compound is insoluble.

36.

What electrolytes are produced when Mg(OH)₂ is dissolved in water?

Mg²⁺ and 2OH^-

Mg²⁺ and OH^-

Mg and OH

No electrolytes produced. This compound is insoluble.

37.

(Honors) What mass of precipitate can be produced from the reaction of 2.0 L of 0.006 M AgCH₃CO₂ with an excess Li₂CrO₄?

2 AgCH₃CO₂(aq) + Li₂CrO₄(aq) --> 2 LiCH₃CO₂(aq) + ________ (s)

2.0 g

0.95 g

4.0 g

25.3 g

38.

Select the correct choice

Beaker X represents a more soluble solute and a more conductive solution

Beaker Y represents a more soluble solute and a more conductive solution

Beaker X represents a more soluble solute but a less conductive solution

Beaker Y represents a less soluble solute but a more conductive solution

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Chemistry Unit 7 Review

Total questions: 38

Worksheet time: 1hrs 3mins

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