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WorksheetsSystems and Scales
Total questions: 68
Worksheet time: 2hrs 10mins
What scale is the universe?
large
macroscopic
microscopic
atomic-molecular
What scale is a human being?
large
macroscopic
microscopic
atomic-molecular
What scale is bacteria?
large
macroscopic
microscopic
atomic-molecular
What scale is a carbon dioxide molecule?
large
macroscopic
microscopic
atomic-molecular
Your teacher lights a dish of ethanol on fire. When the flame goes out, there is no ethanol left in the dish. Was the ethanol destroyed?
Yes
No
Is this an atom, a molecule, both, or neither?
atom
molecule
both
neither
Is this an atom, a molecule, both, or neither?
atom
molecule
both
neither
Is this an atom, a molecule, both, or neither?
atom
molecule
both
neither
Is this an atom, a molecule, both, or neither?
atom
molecule
both
neither
Is this an atom, a molecule, both, or neither?
atom
molecule
both
neither
Is this an atom, a molecule, both, or neither?
atom
molecule
both
neither
Is this an atom, a molecule, both, or neither?
atom
molecule
both
neither
Burning ethanol is...
a chemical change
a physical change
destroying matter
creating matter
Ice melting is a....
a chemical change
a physical change
destroying matter
creating matter
When CO2 dissolves in water (H2O), the product is .....
calcium chloride (CaCl2)
Hydrogen Carbide
Carbonic Acid (H2CO3)
oxygen
Will the carbon atoms that exist in CO2 today still be carbon atoms in a million years?
yes
no
maybe
Will the CO2 molecules that exist today still be CO2 molecules in a million years?
yes
no
maybe
The BTB changed colors from blue to green. This is an example of _______________ evidence
qualitative
quantitative
quazi
After leaving it for 20 minutes, the soda water's mass decreased from 38.97g to 38.45g. This is an example of _______________ evidence
qualitative
quantitative
quazi
What are the products of combustion?
Hydrogen + oxygen
Carbon dioxide + water
Carbon dioxide + hydrogen
Carbon + water
What is Combustion?
reaction between substance (fuel, wood, paper clothes etc) and oxygen that releases Carbon dioxide and Water, with lots of energy.
reaction between substance (fuel, wood, paper clothes etc) and carbon dioxide that releases oxygen and Water, with lots of energy.
reaction between substance (fuel, wood, paper clothes etc) and water that releases Carbon dioxide and oxygen with lots of energy.
Carbon dioxide is what we breathe out
Which is NOT true about the law of conservation of energy?
Energy can not be destroyed
Energy can only be rearranged
Energy can be created
energy in = energy out
All the matter is made up of
Atoms
Mixtures
Compounds
Reactions
Which of the models of a chemical reaction best represents the Law of Conservation of Mass?
A
B
C
D
Which of the models of a chemical reaction best represents the Law of Conservation of Mass?
A
B
C
D
A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?
The heat caused the chemical to become less dense.
The reaction gave off more heat than was added.
Some of the lighter particles were destroyed.
Some of the particles escaped as a gas formed.
A student measures the mass of an iron nail to be 25 grams. The student heats the nail over a bunsen burner and measures the mass of the nail afterwards. The mass of the nail is found to be greater after burning. Which of the following best explains the increase in mass of the nail?
The heat caused the compound to become more dense.
The reaction gave off less heat than was added.
Some of the heavier particles multiplied inside the nail.
Extra particles from the air were added to the nail during burning.
According to the law of conservation of energy, energy can be created or destroyed.
True
False
According to the law of conservation of energy, the total amount of energy in the universe ____.
remains constant
changes constantly
increases
decreases
What are the products of the chemical reaction pictured?
CH4 and CO2
CH4 and O2
CO2 and 2 H2O
O2 and H2O
Water (H2O) is:
Inorganic
Organic
Both
Lipids are:
Inorganic
Organic
Both
Carbon dioxide (CO2) is:
Organic
Inorganic
Both
How many atoms of Sulfur do you see in the following formula?
2
1
4
6
How many atoms of Oxygen are in Glucose?
24
6
12
18
How many atoms of Carbon are in this formula? C6 H12O6
6
1
12
Is this an element or a compound? CaSO4
Element
Compound
Which element has the greatest number of atoms? AgNO3
Silver
Gold
Nitrogen
Oxygen
Molecules that are made of more than one type of atom are called?
Molecules
Elements
Mixtures
Compounds
How many Aluminum atoms are in Al2O3?
3
2
5
1
In reactions, products must be equal to..
Products
Reactants
Starters
Enders
According to the law of conservation of mass, how does the amount of each element on the product side compare to each element on the reactant side?
The amount of atoms on each side is equal
The amount of atoms on the product side is greater
The amount of atoms on the reactant side is greater
Depends on the reaction
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
Which are the reactants in the following reaction?
2Mg + O2 → 2MgO
Mg and O
MgO
Mg and MgO
O and MgO
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.
