Which is an example of a chemical reaction?

flour and sugar mixed in a bowl

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

Coal is made up of more than one element

In a chemical equation, is it true that -

the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made

the reactant side and product side can have different numbers of atoms for each element

there can be different elements on the reactant side and the product side

an element or compound must be accompanied by a phase change

Chemical Reactions

8th Grade

•

20 Qs

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20 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following models best demonstrates a balanced chemical equation?

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Is melting ice a chemical or physical change?

chemical

physical

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Is glass breaking a chemical or phyiscal change?

chemical

physical

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Is melting butter for popcorn a chemical or physical change?

chemical

physical

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the left part of a chemical equation called?
H_{2 +}O → H₂O

Reactants

Products

Yields

Chemical Equation

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Is this balanced?
2HgO → 2Hg + O₂

Yes

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Is this balanced?
Al + O₂ → 2Al₂O₃

Yes

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Chemical Reactions

20 questions

Which of the following models best demonstrates a balanced chemical equation?

Is melting ice a chemical or physical change?

Is glass breaking a chemical or phyiscal change?

Is melting butter for popcorn a chemical or physical change?

What is the left part of a chemical equation called?
H_{2 +}O → H₂O

Is this balanced?
2HgO → 2Hg + O₂

Is this balanced?
Al + O₂ → 2Al₂O₃

Which of the following equations demonstrates an actual chemical reaction that forms a new substance? (HINT: it must follow the Law of Conservation of Mass)

Which is an example of a chemical reaction?

How many atoms in all are in a molecule of serotonin?
C₁₀H₁₂N₂O

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Chemical Reactions

20 questions

Which of the following models best demonstrates a balanced chemical equation?

Is melting ice a chemical or physical change?

Is glass breaking a chemical or phyiscal change?

Is melting butter for popcorn a chemical or physical change?

What is the left part of a chemical equation called?H2 + O → H2O

Is this balanced?2HgO → 2Hg + O2

Is this balanced?Al + O2 → 2Al2O3

Which of the following equations demonstrates an actual chemical reaction that forms a new substance? (HINT: it must follow the Law of Conservation of Mass)

Which is an example of a chemical reaction?

How many atoms in all are in a molecule of serotonin?C10H12N2O

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

What is the left part of a chemical equation called?
H_{2 +}O → H₂O

Is this balanced?
2HgO → 2Hg + O₂

Is this balanced?
Al + O₂ → 2Al₂O₃

How many atoms in all are in a molecule of serotonin?
C₁₀H₁₂N₂O