What does the law of conservation of mass state?

AQA GCSE CHEM Quantitative Chemistry MCQs FT

Flashcard
•
Chemistry
•
9th - 10th Grade
•
Hard
Laura McGuinness-Brown
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26 questions
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1.
FLASHCARD QUESTION
Front
Back
no atoms are lost or made during a chemical reaction so the mass of the products equals the mass of the reactants
2.
FLASHCARD QUESTION
Front
How many different elements are there in calcium carbonate (CaCO3)?
Back
3
3.
FLASHCARD QUESTION
Front
Potassium nitrate has the chemical formula KNO3. What is the total number of atoms in potassium nitrate?
Back
5
4.
FLASHCARD QUESTION
Front
Correctly balanced symbol equation for the reaction between magnesium and oxygen?
Back
2Mg + O2 ==> 2MgO
5.
FLASHCARD QUESTION
Front
Magnesium + oxygen ==> magnesium oxide 3g of magnesium completely reacts with 2g of oxygen. What is the mass of magnesium oxide formed?
Back
6g
6.
FLASHCARD QUESTION
Front
What happens to the mass inside an unsealed test tube when copper carbonate is heated and decomposes into copper oxide and carbon dioxide?
Back
decrease
7.
FLASHCARD QUESTION
Front
What is the relative formula mass of sodium hydroxide (NaOH)? Relative atomic masses (Ar): Na = 23, O = 16, H = 1
Back
37
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