Hoang's Unit 4 Test Review 2

Quiz
•
Chemistry
•
10th Grade
•
Medium
Standards-aligned
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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