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WorksheetsChem 2 Review
Total questions: 27
Worksheet time: 14mins
The formula for sugar is C₆H₁₂O₆. What does that mean?
It has 6 carbon, 6 hydrogen, and 6 oxygen atoms
It has 6 carbon, 12 hydrogen and 6 oxygen atoms
It has 6 calcium, 12 hydrogen, and 6 oxygen atoms
It has 6 carbon, 12 helium, and 6 oxygen atoms
You can describe a lemon as being oval, yellow colored, and sour tasting. All of these are _________.
Chemical properties
Physical properties
Chemical changes
Physical change
All of the following are evidence that a chemical change has occurred except _____.
formation of a precipitate when substances are mixed
change in temperature when substances are mixed
formation of a gas when substances are mixed
dissolving of a substance when substances are mixed
Which statement about a physical and chemical change is true?
if matter changes size or shape, it indicates a chemical change
if matter changes state of matter, it indicates a chemical change
if matter changes in color, it is always a physical change
a change in temperature often occurs during a chemical change
Classify each change as physical or chemical. Mark A for physical and B for chemical.
A saw cuts a log and creates sawdust.
A
B
Classify each change as physical or chemical. Mark A for physical and B for chemical.
Baking bread.
A
B
Classify each change as physical or chemical. Mark A for physical and B for chemical.
The Statue of Liberty changes from copper to green.
A
B
Classify each change as physical or chemical. Mark A for physical and B for chemical.
Chocolate syrup is dissolved in milk.
A
B
Classify each change as physical or chemical. Mark A for physical and B for chemical.
Leaves changing color in the fall.
A. Physical change
B. Chemical change
Using the box shown, what number represents the coefficient?
1
2
3
4
How many atoms of H are there?
4
6
8
10
Which of the following equations is balanced?
FeS₂ + O₂ → Fe₂O₃ + SO₂
KCl + Fe₂ → KFe + Cl₂
CO₂ + H₂O → C₆H₁₂O₆ + O₂
3Ag₂S + 2Al → 6Ag + Al₂S₃
Using the equation, 3Ag₂S + 2Al → 6Ag + Al₂S₃, identify the reactants.
Al₂S₃
2Al
3Ag₂S + 2Al
6Ag + Al₂S₃
What is the product for the following equation? Al + O₂ → Al₂O₃
Al
O₂
Al + O₂
Al₂O₃
Ben and Jerry put powder in a ziplock bag and added some water. The powder fizzed and bubbled; soon it disappeared. When the bubbling stopped, the bag contained a clear liquid and a lot of gas. What is the most obvious sign of a chemical change in this reaction?
there was a change in temperature
a gas was produced
the powder mixed with the water
the powder dissolved in the water
George stores a gallon of milk in the refrigerator. 3 weeks later he notices that the milk is frozen on the top layer and smells strongly of a sour odor. Which statement justifies that a physical change has occurred in the milk?
There is less milk since some is frozen
There is a bacterial culture growing in the milk causing the sour smell
Some of the sugar in the milk has been lost leading to a more sour taste
The frozen layer on top of the milk can melt when it is at room temperature
If there are 4 grams of reactant, how many grams of products are produced by the chemical reaction?
4 grams
8 grams
2 grams
0 grams
Explain why the chemical reaction to the right obeys the Law of Conservation of Matter.
there are more reactants than products
they both start and end with diatomic (two-atomed) molecules
they both start and end with compounds
the reactants and products contain the same number of atoms of each element
The law of conservation of matter states that during a chemical reaction, the amount of matter ___.
stays the same
decreases
increases
disappears
Determine whether the equation is representative of an exothermic or endothermic reaction.
2H2O + heat ----> 2H2 + O2
Endothermic
Exothermic
Determine whether the equation is representative of an exothermic or endothermic reaction.
Mg + Cl2 ----> MgCl2 + heat
endothermic
exothermic
When you bake cookies in the oven, what is happening in terms of energy?
an endothermic reaction, absorbing heat from its surroundings
an endothermic reaction, releasing heat from its surroundings
an exothermic reaction, absorbing heat from the surroundings
an exothermic reaction, releasing heat from its surroundings
When calcium chloride is mixed with water, it gives off heat. This observation suggests that ____.
it is an endothermic reaction
the matter doesn’t change
a change in state has occurred
it is an exothermic reaction
When vinegar is added to baking soda and bubbles are produced, which of the following best describes what is happening?
Color change
Temperature change
Formation of a precipitate
Formation of a gas
Use the following data table for the next question. Which question can this experiment answer?
Does the amount of water given to a tomato plant affect the number of earthworms on the plants?
Does having earthworms in the soil affect the number of tomatoes that grow on a tomato plant?
Does adding water to the soil affect the number of tomatoes that grow on a tomato plant?
Does the number of tomatoes that grow affect the number of earthworms in the soil?
Which question can this experiment answer?
Does the amount of water given to a tomato plant affect the number of earthworms on the plants?
Does having earthworms in the soil affect the number of tomatoes that grow on a tomato plant?
Does adding water to the soil affect the number of tomatoes that grow on a tomato plant?
Does the number of tomatoes that grow affect the number of earthworms in the soil?
Use the Triple Beam Balance below to identify the correct mass below.
78 grams
77.5 grams
70.75 grams
70.8 grams
