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Science
9th
grade
Laws of Chemical Combination | Atoms and Molecules | Assessment | English | Grade 9
5 questions
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- 1. Multiple Choice
Matter is made up of _________________.
electrons
protons
neutrons
atoms
- 2. Multiple Choice
Mass is neither created nor destroyed in a chemical reaction. This statement is for ____________ .
Law of conservation of mass
Law of constant proportion
Law of multiple proportions
All of the above
- 3. Multiple Choice
The law of constant proportions was given by _________ .
Lavoisier
J J Thomson
John Dalton
Proust
- 4. Multiple Choice
The proportion of oxygen and hydrogen in H₂O molecule is _______________ .
1 is to 8
1 is to 4
4 is to 1
8 is to 1
- 5. Multiple Choice
The proportion of of hydrogen and oxygen in hydrogen peroxide is __________ .
1 is to 8
1 is to 16
8 is to 1
16 is to 1
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