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- 1. Multiple Choice
Matter can not be created nor destroyed: it can only be
Destroyed a little bit
frozen
Transformed or changed
evaporated
- 2. Multiple Choice
In a synthesis reaction
A compound breaks apart into two or more compounds
Two or more reactants make one larger product
CO2 and H2O must be products
O2 must be a reactant
- 3. Multiple ChoiceThe coefficient in 3H2O is6235
- 4. Multiple Choice
In a reaction A + B → C, reactant A weighs 5g and product C weighs 9g. How many grams does reactant B weigh?
4g
5g
9g
14g
- 5. Multiple Choice
What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?
They both will weigh the same
The product always weighs more than the reactant
The reactant will weigh more than the product
They both will lose mass after the reaction
- 6. Multiple Choice
P4 + 3 O2 ---> 2 P2O3
What type of chemical reaction is written above?
Single Replacement
Combustion
Synthesis
Decomposition
- 7. Multiple Choice
Which are the reactants in the following reaction?
2Mg + O2 → 2MgO
Mg and O
MgO
Mg and MgO
O and MgO
- 8. Multiple Choice
Which of the following chemical equations is balanced?
2Na + 4Cl → 3NaCl
H₂ + O₂ → 2H₂O₄
4Al + 3O₂ → 2Al₂O₃
- 9. Multiple Choice
AB → A + B
In the reaction above, reactant AB has a mass of 12 grams and product B has a mass of 5 grams. How many grams should product A have?
17g
2g
7g
5 grams
- 10. Multiple ChoiceBob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?200 g700 g1,100 g
- 11. Multiple Choice
How many oxygen atoms are in this chemical formula?6 oxygen atoms2 oxygen atoms3 oxygen atoms4 oxygen atoms - 12. Multiple ChoiceWhat is the law of conservation of mass?The amount of matter changes when reacted or changed.The mass of all reactants are changed during a physical or chemical changeThe mass of the reactants equals the mass of the productsThe mass of the products is different than the mass of the reactants.
- 13. Multiple Choice
Students react baking soda with vinegar in Coach Moore's class. Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
Bubbles were produced during the reaction, which meant that a gas was being produced.
The plastic bag did not change in any way, indicating that it was not involved in the reaction.
The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.
- 14. Multiple Choice
Suppose a reaction were to happen in a lab. During the reaction, the scientist observes the chemicals bubble and produce a gas. During the analysis the scientist notices that the reactants weighed 20 grams when he started, and the product weighed 18 grams. Explain what happened.
His chemical reaction defied the law of conservation of mass
The product destroyed mass during the reaction
The reactants created matter during the reaction
The gas that was produced was not able to be weighed since the container was open.
- 15. Multiple Choice
10 grams of a solid chemical reacts with a 10 grams of a liquid chemical, the reaction bubbles and changes the color of the liquid. The colored liquid weighs 13 g, what can be concluded?
The gas produced from the bubbles weighed 5 grams
The bubbles were evidence of 7 grams of matter being destroyed
The gas produced weighed 7 grams
The gas produced weighed 13 grams
- 16. Multiple Choice
Fill in the coefficient for HCl to balance the chemical equation.
Mg + ___ HCl → MgCl2 + H2
1
2
3
4
- 17. Multiple Choice
During our elephant toothpaste demonstration, heat was produced when the hydrogen peroxide bonds were broken during the decomposition reaction. A chemical reaction that releases heat is called?
Endothermic
Exothermic
Unstable
Thermodynamic
- 18. Multiple Choice
Students in Coach Moore's class combined baking soda and vinegar in a Ziplock bag. Once the reaction began, students noticed the bag felt cooler to the touch. A chemical reaction or process that absorbs heat from the surroundings is called?
Endothermic
Exothermic
Synthetic
Unstable
- 19. Multiple ChoiceIf reaction starts with 20g of reactants it should producea total of 40g of productsa total of 10g of productsa total of 80 g of productsa total of 20g of products
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