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[8th Grade] Week 4 Quiz

Last updated about 1 year ago

6 questions

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Question 1

1.

A compound has to have 2 or more atoms
化合物必须有 2 个或更多原子, 正确或错误

True

False

Question 2

2.

This could be an artist's picture of:

hydrogen atoms
氢原子

ammonia molecules
氨分子

oxygen molecules
氧分子

water molecules
水分子

Question 3

3.

Which of these are correct chemical formulas?
哪些是正确的化学式？

H20

NH3

OO

CO2

Question 4

4.

Which of these is the smallest unit of an element

Atom
原子

Molecule
分子

Compound
化合物

None of these
这些都不是

Question 5

5.

Explain why O2 and O3 are different compounds
解释为什么 O2 和 O3 是不同的化合物

Question 6

6.

Which method is best for separating a homogenous mixture of water and acetone?
哪种方法最适合分离水和丙酮的同质混合物？

filtration
过滤

evaporation
蒸发

distillation
蒸馏

magnetic attraction
磁吸引力