Chemical equations

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Last updated: 22/10/2019

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Question 1 of 25

1. Question
What is a chemical equation?
- Shows the reactants and the products in a reaction.
- Shows the type of reaction occurring.
- Shows how quickly a reaction takes place.
- Shows the reaction process.
Question 2 of 25

2. Question
What are reactants?
- Substances that you start with.
- Substances that are made in a reaction.
- Substances within a reaction.
- Any suitable substance.
Question 3 of 25

3. Question
What are products?
- Substances that are made in a reaction.
- Substances that you start with.
- Substances within a reaction.
- Any suitable substance.
Question 4 of 25

4. Question
What do symbol equations help to do?
- Show how much of each substance is being used/made.
- Shows the location within the periodic table.
- Show the type of reaction.
- Show the different groups being used.
Question 5 of 25

5. Question
What does it mean when an equation is balanced?
- There is an equal number of each type of atom of either side of the equation.
- There is a different number of each type of atom on each side of the equation.
- The mass of the reactants are the same.
- The mass of the reactants and products are different.
Question 6 of 25

6. Question
What does it mean when an equation is unbalanced?
- There is a different number of each type of atom on each side of the equation.
- There is an equal number of each type of atom of either side of the equation.
- The mass of the reactants are the same.
- The mass of the reactants and products are different.
Question 7 of 25

7. Question
What can atoms not be in a reaction?
- Created
- Moved
- Transferred
- Bonded differently
Question 8 of 25

8. Question
What can atoms not be in a reaction?
- Destroyed
- Moved
- Transferred
- Bonded differently
Question 9 of 25

9. Question
What is the same for a chemical equation?
- The total mass of reactants and products.
- The length of time for the reaction.
- The concentration for the reactants and products.
- The products have the same compounds as the reactants.
Question 10 of 25

10. Question
What is it called when the total mass of the products form in a reaction is the same as the total mass of the reactants?
- Law of conservation of mass.
- Newton's first law of mass
- Mendeleev's breakthrough
- Newland's law
Question 11 of 25

11. Question
What is the state symbol for a solid?
- (s)
- (g)
- (l)
- (aq)
Question 12 of 25

12. Question
What is the state symbol for a liquid?
- (l)
- (g)
- (s)
- (aq)
Question 13 of 25

13. Question
What is the state symbol for a gas?
- (g)
- (l)
- (s)
- (aq)
Question 14 of 25

14. Question
What is the state symbol for an aqueous solution?
- (aq)
- (l)
- (s)
- (g)
Question 15 of 25

15. Question
What is an aqueous solution?
- A substance dissolved in water.
- A substance dissolved in an acid.
- Distilled water.
- A substance dissolved in a hydroxide.
Question 16 of 25

16. Question
What can not be changed when balancing a chemical equation?
- The chemical formula
- The mass
- The number of moles
- The mole ratios
Question 17 of 25

17. Question
How many state symbols are there?
- 4
- 3
- 2
- 1
Question 18 of 25

18. Question
How many types of chemical equations can be written?
- 2
- 1
- 3
- 4
Question 19 of 25

19. Question
Which of the following is a form of writing a chemical equation?
- Word equation
- Number equation
- Formula equation
- Element equation
Question 20 of 25

20. Question
Which of the following is a form of writing a chemical equation?
- Symbol equation
- Number equation
- Formula equation
- Element equation
Question 21 of 25

21. Question
Balance the following equation; CO2 + H2O → C6H12O6 + O2.
- 6CO2 + 6H2O → C6H12O6 +62O2
- 3CO2 + 2H2O → C6H12O6 + 2O2
- 4CO2 + 6H2O → C6H12O6 + 2O2
- 5CO2 + 2H2O → 2C6H12O6 + 6O2
Question 22 of 25

22. Question
Balance the following equation; H2 + O2 → H2O.
- 2H2 + O2 → 2H2O
- 2H2 + O2 → H2O
- 3H2 + 2O2 → H2O
- 2H2 + 3O2 → 6H2O
Question 23 of 25

23. Question
Balance the following equation; H2 + Cl2 → HCl.
- H2 + Cl2 →2HCl
- 2H2 + 2Cl2 → HCl
- 2H2 + 2Cl2 → 3HCl
- H2 + Cl2 → 4HCl
Question 24 of 25

24. Question
Which part of a reaction comes first?
- Reactants
- Products
- Either products or reactants.
- Neither products or reactants.
Question 25 of 25

25. Question
Which part of a reaction comes last?
- Products
- Reactants
- Either products or reactants.
- Neither products or reactants.

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