Hoang's Unit 4 Test Review 2

Hoang's Unit 4 Test Review 2

10th Grade

19 Qs

quiz-placeholder

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Hoang's Unit 4 Test Review 2

Hoang's Unit 4 Test Review 2

Assessment

Quiz

Chemistry

10th Grade

Medium

NGSS
HS-PS1-7, HS-LS1-6

Standards-aligned

Created by

Binh Hoang

Used 2+ times

FREE Resource

19 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

54 g

36 g

18 g

72 g

Answer explanation

To convert moles to grams, multiply the number of moles by the molar mass. Here, 3 moles of H2O x 18 g/mol = 54 g. Thus, the correct answer is 54 g.

Tags

NGSS.HS-PS1-7

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1 mole

2 moles

3 moles

4 moles

Answer explanation

To find the number of moles, use the formula: moles = mass (g) / molar mass (g/mol). Here, moles = 88 g / 44 g/mol = 2 moles. Therefore, the correct answer is 2 moles.

Tags

NGSS.HS-PS1-7

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Answer explanation

To find the number of molecules in 2 moles of nitrogen gas (N2), multiply the number of moles by Avogadro's number: 2 moles × 6.022 × 10^23 molecules/mol = 1.204 × 10^24 molecules. Thus, the correct answer is 1.204 × 10^24 molecules.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

88.89%

44.44%

33.33%

11.11%

Answer explanation

To find the percent composition of oxygen in H2O, divide the molar mass of oxygen (16 g/mol) by the molar mass of water (18 g/mol) and multiply by 100. (16/18) * 100 = 88.89%. Thus, the correct answer is 88.89%.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

90 g

45 g

180 g

60 g

Answer explanation

To find the mass of glucose, multiply the number of moles by the molar mass: 0.5 moles × 180 g/mol = 90 g. Therefore, the correct answer is 90 g.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1 mole

2 moles

3 moles

4 moles

Answer explanation

To find moles of NaCl, use the formula: moles = mass (g) / molar mass (g/mol). Here, moles = 117 g / 58.5 g/mol = 2 moles. Thus, the correct answer is 2 moles.

Tags

NGSS.HS-PS1-7

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Calculate the number of particles in 0.25 moles of helium gas using Avogadro's number.

Answer explanation

To find the number of particles in 0.25 moles of helium, multiply by Avogadro's number (6.022 x 10^23). Thus, 0.25 moles x 6.022 x 10^23 = 1.5055 x 10^23 particles, making the correct choice 1.5055 x 10^23 particles.

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