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2023 Test Cons. of Mass and Physical and Chem Change

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Last updated over 3 years ago
20 questions
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5
Question 1
1.

Question 2
2.

Question 3
3.

Question 4
4.

How many hydrogen atoms are in the reactant above?

Question 5
5.

How many oxygen atoms are in the reactant above?

Question 6
6.

How many oxygen atoms are in the product above?

Question 7
7.

How many hydrogen atoms are in the product above?

Question 8
8.

Question 9
9.

In the picture above, the coefficent is represented what number?

Question 10
10.

In the picture above, the subscript is represented by the number...

Question 11
11.

Question 12
12.

Question 13
13.

Question 14
14.

Question 15
15.

Question 16
16.

Question 17
17.

Question 18
18.

Question 19
19.

Question 20
20.

The arrow (yield sign) in a chemical equation represent what?
the occurance of a chemical reaction
the flow of energy
the a physical change has occured
where to start counting atoms
The compounds to the left of the arrow are called the...
reactants
products
The compounds to the right of the arrow are called the...
products
reactants
Is the chemical equation balanced or unbalanced?
balanced
unbalanced
The Law of Conservation of Matter states that:
The mass of the products is always less than the mass of the reactants.
Matter can neither be created nor destroyed, it simply changes form.
The mass of the products is always greater than the mass of the reactants.
Matter is always converted into an equal amount of energy.
Before a chemical reaction, the total mass of two reactants is measured to be 40 grams. After the reaction, what should be the total mass of the products?
0 grams
40 grams
20 grams
80 grams
What happens to the atoms in a chemical reaction?
They turn into energy.
They change into atoms of different elements.
They are destroyed.
They are rearranged.
Copper chloride and aluminum react to produce aluminum chloride and copper. Which of the following is the correctly balanced chemical equation for this reaction? (Hint: It's the only balanced equation)
3CuCl2 + 2Al --> 2AlCl3 + 3Cu
3CuCl2 + Al --> AlCl3 + 2Cu
CuCl2 + Al --> AlCl3 + Cu
CuCl2 + 3Al --> AlCl3 + 2Cu
Hydrogen and oxygen react to produce water. Which of the following is the correctly balanced chemical equation for this reaction?
2H2 + O2 --> 2H2O
H2 + O2 --> H2O
H2 + O2 --> H4O2
2H2 + 2O2 --> 4H2O
Water heating and turning into steam is a ___________ change.
chemical
physical
Iron rusting is a ___________ change.
chemical
physical
Select all of the pictures that represent a chemical change.
Baking Cookies
Making a snowball
Burning Wood
Melting ice
Digesting food
Ripping paper
Select all examples of chemical changes.
Cooked pancakes
Ash left after a fire
Ice melting
Soured Milk
Pencil shavings
Boiling water
What are the 5 evidences of a chemical change? (CHOOSE FIVE)
can be reversed
production of light
Gas formed (bubbles)
formation of a precipitate (solid)
temperature stays the same
color change
nothing new is created
melting occurs
Sound is produced