NEW
Font size
WorksheetsUnit 2 Review
Total questions: 25
Worksheet time: 13mins
In the equation, how many atoms are in the Hydrogen molecule?
1
2
3
4
The diagram is a model of a molecule of methane. What is the formula for methane?
CH₈
C₈H₄
CH₄
C₈H₈
According to the Chemical Compounds table above, how many total atoms are in Hydrogen Peroxide?
2
4
6
8
According to the Chemical Compounds table, how many total elements are in Glucose?
2
3
4
5
What is the only non-reactive non-metal group on the Periodic Table?
Group 1
Group 2
Group 17
Group 18
The most reactive metal is one with -
3 valence electrons
2 valence electrons
1 valence electrons
4 valence electrons
When determining an element's chemical properties, what is the most important subatomic particle to look at?
electrons
neutrons
valence electrons
protons
Which subatomic particles have a mass of 1amu?
protons and electrons
electrons and neutrons
neutrons and the nucleus
protons and neutrons
What is an atom mostly made up of?
Empty space
Protons
Neutrons
Electrons
What substances are formed due to a chemical reaction? (what you end up with
Mass
Reactants
Products
Atoms
2NaCl + F₂ → 2NaF + Cl₂ 5g + 3g 6 + ?g What would be the missing mass of Cl ₂?
2g
8g
4g
3g
How can a student know if a chemical reaction follows the Law of Conservation of Mass?
The student can compare if the same molecules of the products and reactants are present before and after the reaction.
The student can compare the mass of the products and reactants to determine if the mass is the same before and after the reaction.
The student can compare the products and reactants to determine if the same elements are present before and after the reaction.
and reactants to determine if the same elements are present before and after the reaction.
The student can compare the products and reactants to determine if the same number of molecules are present before and after the reaction.
A student had two mineral samples which they know to be quartz or calcite. He puts two drops of Hydrochloric acid on each sample. He knows that when calcite reacts with Hydrochloric acid and produces a gas. He also knows that when Hydrochloric acid is placed on quartz that no changes are observed. Using the information above, what evidence indicates that a chemical reaction occurs when Hydrochloric acid is placed on Calcite?
Calcite is made up of 4 elements, while quartz is made up of 2.
The gas from the air is captured in the acid.
The shape of the calcite changes.
The gas is a new substance created from the calcite and Hydrochloric acid.
Students conducted an investigation and observed the following: 1. The substance formed a precipitate. 2. The substance melted at 110 degrees Celsius. 3. The substance produced a gas. 4. The substance dissolved in water. Which of these substances produced a chemical change?
Substances 1 and 2
Substances 1 and 3
Substances 1 and 4
Substances 2 and 3
A tarnished coin was tossed into a chemical solution and bubbles began to form and the coin was less tarnished (shinier). A student inferred that a chemical reaction had taken place. What evidence supports the student's inference?
The coin experienced a color change and produced light.
The coin experienced a color change and is in a new state of matter.
The coin experienced a color change and a precipitate formed.
The coin experienced a color change and a gas was produced.
If you mixed two substances together and a milky substance formed and sank to the bottom, what would be the reason for this result?
A part of the substance dissolved
The combined substances reacted chemically
After the liquid evaporated a solid substance formed.
Crystals were produced after an increase in temperature.
Which of the following is an example of substances LEAST LIKELY reacting chemically?
Temperature decreased and a solid formed
Temperature increased and a gas was produced
Two clear liquids mixed and the solution turned red
When mixed, the substances separated into layers
Which of the following models best demonstrates the law of conservation of mass?
F
G
H
J
The chemical equation demonstrates that -
matter cannot be created or destroyed by a chemical reaction
the reactants are the same substances as the products
the number of molecules in the reactants is equal to the number of molecules in the products
the atoms on the reactants side are changed into different atoms on the products side
Based on what you know about the organization of the Periodic Table, which two elements shown above would have the most similar chemical properties?
Chlorine and Argon
Bromine and Krypton
Chlorine and Krypton
Chlorine and Bromine
The chemical formula represents the substance Magnesium Hydroxide (Milk of Magnesia): 2Mg(OH)₂ How many molecules of Magnesium Hydroxide are present?
2
6
12
24
How many atoms are in one molecule of Glycerol, C₃H₈O₃?
3
8
11
14
Which of the following formulas contain the same number of Nitrogen atoms?
Formulas I and II
Formulas II and IV
Formulas I, II, and III
Formulas I, II, and V
What information can be determined from the chemical formula?
The color of the molecule
The size of the molecule
The number of atoms of each element in the molecule
The structural arrangement of the atoms in the molecule
According to the formula, how many atoms of Hydrogen are there?
1
2
3
4
