Physical & Chemical Properties
Which type of property can be observed without changing the identity of the substance?
a. physical property
b. chemical property
Physical Property
Which type of change results in a new substance being formed?
a. physical change
b. chemical change
Chemical Change
Which type of matter is made of one type of atom?
a. Element
b. Compound
c. Mixture
Element
True or False: The law of conservation of mass states that matter cannot be created or destroyed, only rearranged.
True
How many TOTAL atoms are in water (H2O)?
3 atoms
2. Malleability is a __________ property of most metals.
Reacting with oxygen to form copper oxide is a __________ property.
A. physical; chemical
B. chemical; physical
C. chemical; chemical
D. physical; physical
A. physical; chemical
Identify the following changes that indicate a chemical change:
a. Evaporating
b. Tarnishing
c. Dissolving
d. Rusting
e. Souring
Chemical Changes:
b. Tarnishing
d. Rusting
e. Souring
12. Classify each example as either an element or compound:
a. Helium
b. Sugar
c. Iron (Fe)
a. Helium ---> element
b. Sugar ---> compound
c. Iron (Fe) ---> element
Identify the products in the chemical equation below.
Fe + O2 = Fe3O4
Products are Fe3O4
9. Students measure a cube with sides of 4.0 cm. Its mass is 256 g. What property can be determined using these measurements?
A. Color
B. Density
C. Combustibility
D. Boiling point
B. Density
6. Select all examples of CHEMICAL properties:
A. Flammability
B. Solubility
C. Reactivity with acid
D. Density
E. Ability to rust
F. Melting point
A. Flammability
C. Reactivity with acid
E. Ability to rust
7. Which are signs of a chemical change?
A. Heat produced
B. Change in state
C. Gas formed
D. Color change
E. Cutting into pieces
F. Production of light
G. Formation of a precipitate
a. Heat produced
b. Gas formed
D. Color change
F. Production of light
G. Formation of a precipitate
A(n) ________________ cannot be chemically separated, but a _____________ can be physically separated
Hint: one type of atom vs. 2 or more atoms bonded together
A(n) element cannot be chemically separated, but a compound can be physically separated
1. Two clear solutions are mixed and form a yellow solid. According to the law of conservation of mass, what happens to the total mass?
A. It increases
B. It decreases
C. It stays the same
D. It becomes unpredictable
C. It stays the same
18. Which chemical formula represents the substance with the greatest number of atoms?
A. H₂SO₄
B. C₂H₆O
C. C₆H₁₂O₆
D. CO₂
C. C₆H₁₂O₆
3. Which scenarios represent chemical changes?
A. Bread dough rising
B. Sugar dissolving in tea
C. Metal tarnishing
D. A log burning
E. Ice melting
A. Bread dough rising
C. Metal tarnishing
D. A log burning
5. Which describes only physical changes in preparing food?
A. Bread dough rising as it ferments
B. Sugar caramelizing when heated
C. Cutting vegetables into smaller pieces
D. Meat cooking and turning brown
C. Cutting vegetables into smaller pieces
A _________________ mixture looks the same throughout, whereas a ____________________ mixture looks different throughout.
A ___homogeneous______ mixture looks the same throughout, whereas a ____heterogeneous_____ mixture looks different throughout.
Does the chemical equation below follow the Law of Conservation of Mass? Why or why not?
2C2H4 + O2 --> 2C2H4O
Yes, the equation follows the Law of conservation of mass because it has the same number of each type of atom on the reactant and product side.
2C2H4 + O2 --> 2C2H4O
11. An unknown substance has a mass of 100 grams and occupies a volume of 7.35 cm3. Use the data below to identify the substance.
Substance Density (g/cm3)
Gold 19.3
Mercury 13.6
Lead 11.3
Iron 7.8
Mercury
4. A student is asked to investigate physical properties of an unknown powder. Which procedure BEST measures a physical property?
A. Mixing the powder with vinegar to see if it bubbles
B. Heating the powder to check if it burns
C. Measuring the powder’s melting point
D. Adding iodine to see if the color changes
C. Measuring the powder’s melting point
It's a cold winter day. Name one type of physical change that could be happening outside and one chemical change that could be occurring.
Answers can vary.
Physical change: ice is melting from the rooftops
Chemical change: people are roasting marshmallows by a fire
13. Identify the type of matter (element, compound, or mixture) for each example below:
a. Brass (mix of copper and zinc)
b. Carbon dioxide (CO2)
c. Smoothie
a. Brass ----> mixture
b. Carbon dioxide (CO2) ----> compound
c. Smoothie ---> mixture
A student thinks that after a chemical reaction occurs, that new atoms are added to a substance since something new if formed.
Explain why they are incorrect. Use the Law of Conversation of Mass to support your answer.
According to the Law of Conversation of Mass, no new matter is created or destroyed, it is only rearranged to form a new substance.
10. The mass of an unidentified rock is 30 grams.
Students determine the volume of the rock by placing the rock in a graduated cylinder with water.
Students calculate the density of the rock by using the initial water level of 10 mL and the final water level of 5 mL. They determine the identity of the rock based on the density ranges in the table below.
Limestone 5.5 - 6.5
Coal 6.8 - 8.5
Igneous 8.8 - 9.5
Sandstone 9.8 - 10.5
The students mostly have which type of rock?_________________________________________
Limestone