WorksheetsUnit 1 Quiz 2 Review
Total questions: 29
Worksheet time: 17mins
Phase changes produce new substances.
true
false
Mixing kool-aid powder and water together makes a new substance.
true
false
In the following equation Mg + O2 = 2MgO identify the reactants.
Mg
2MgO
Mg + O2
Mg + O
Identify the product(s) in the following equation: H2O = H2 + O2.
H2 + 2O2
H2O
H2O2
H2 + O2
Which of the following is a chemical reaction?
Baking cookies
Lighting a sparkler
Adding vinegar to baking soda
All the above
All of the following a signs that a chemical reaction occurred except ___.
phase change
bubbles (release of a gas)
temperature change
color change
A new substance that is formed in a chemical reaction is called the ___.
density
property
product
reactant
Which of the following choices best describe a reactant? Choose all that apply.
An example would be mixing vinegar and baking soda.
substance that a chemical reaction starts with
can be considered the "old stuff" at the start of a chemical reaction
the "new stuff" that is formed in a chemical reaction.
What is the volume of the rock?
35 mL
5 mL
30 mL
65 mL
Which of the following choices is the reactant for the equation above?
Which of the following supports that a chemical reaction has occurred?
the substance has changed state from a liquid to a gas
the substance is now mixed with another substance
the properties of the original substance have changed
When 2 or more substances are mixed together and the resulting substances properties HAVE NOT changed a chemical reaction has occurred.
True
False
In class, when the strip of Mg was burned we gathered data all of the following except for ____.
testing the solubility by putting it in a beaker of water
measuring the mass of the Mg before/after burning
observing color change before/after burning
When a substance goes through a phase change ___.
molecules are rearranged in some of the substances
molecules rearrange making new substances
a chemical reaction occurs
the atoms making up molecules are not rearranged
According to scientific principle #6 properties (denstiy, hardness, melting point, solubility) of a substance will:
stay the same ONLY if the amount of the substance is the same
change based on the amount of the substance present
change because it isn't possible to stay the same if the amount chagnes
stay the same, even if the amount of the substance is different
Kent found 2 wood cubes (like the ones we used in class) and wanted to know if they were made of the same type of wood. Unlike, in class the 2 cubes are different sizes. How could Kent determine if the cubes are made of the same type of wood.
measure the mass of both cubes
measure the length, width, and height and calculate for volume
calculate density for both cubes
burn the wood cubes and observe how they change
Scientific principle #6 states: properties of a given substance are the same regardless of the amount of the substance. Based on this scientific principle, which options below will not change if the amount of a substance is increased?
mass of the substance
melting point of the substance
volume of the substance
solubility of the substance
density of the object
When the Mg was burned, the reactants were made of 2 Mg atoms & 2 O atoms. How many atoms of Mg & O are present in the product after the chemical reaction occurred?
2 atoms of Mg, 4 atoms of O
1 atom of Mg, 1 atom of O
4 atoms of Mg, 4 atoms of O
2 atoms of Mg, 2 atoms of O
The Statue of Liberty is copper and went from being brown to being a green. Why did this occur?
Colored with a giant sharpieThis is a wrong answer
Chemical Reaction
Different substances
Burning
How can we distinguish substances from one another?
size
shape
properties
educated guess
What is the formula for calculating density?
D=V/M
D=MxV
M=D/V
D=M/V
How do I know if burning is a chemical reaction?
The properties change
There is fire
The substance dissappears
Mass is created
What must you always include when you are writing a CER?
Scientist names
Evidence and reasoning
Another claim
Data only
Which of the following are considered a claim.
They are the same substance.
Fat and soap are different substances.
A chemical reaction occurred when magnesium was burned.
Chemical reactions happen.
Which of the following are considered to be evidence when writing a CER? (You may choose more than one!)
data from a data table
measurements
results from an invesigation
data collected from another lab group
What happens when 2 substances combine and a substance with different properties is produced?
mixture
chemical reaction
atomic combustion
solubility
