Measure Up!
A student records the length and width of a rectangular prism in centimeters. Which additional measurement is needed to
calculate its volume?
A. Temperature
B. Height
C. Density
D. Mass
B. Height
An element has atomic number 16. How many protons are in each atom?
A. 8
B. 16
C. 32
D. 48
B. 16
Which characteristic is a chemical property?
A. Electrical conductivity
B. Density
C. Ability to rust
D. Melting point
C. Ability to rust
A sample is dull, brittle, and does not conduct electricity well. Which category best fits?
A. Metal
B. Nonmetal
C. Alkali metal
D. Noble gas only
B. Nonmetal
Carbon dioxide dissolves into a pond and the pH decreases. Which claim is supported?
A. The pond becomes more basic
B. The pond becomes more acidic
C. The pond’s density must become zero
D. Its pH
increases
B. The pond becomes more acidic
A metal object has a mass of 81 g and raises water from 32 mL to 59 mL. What is its density?
A. 1 g/mL
B. 2 g/mL
C. 3 g/mL
D. 27 g/mL
C. 3 g/mL
Which two elements are most likely to share similar chemical properties?
A. Li and Na
B. Li and Ne
C. Na and Cl
D. Ne and Mg
A. Li and Na
Two clear solutions form a yellow precipitate when mixed. What is the best explanation?
A. A new solid substance may have formed
B. Both liquids evaporated
C. No particles remain
D. The reaction destroyed
mass
A. A new solid substance may have formed
When thermal energy is removed from a gas until it becomes a liquid, the change is called —
A. Sublimation
B. Melting
C. Condensation
D. Vaporization
C. Condensation
Select THREE examples of physical change.
A. Crushing a can
B. Burning a candle wick
C. Freezing juice
D. Rusting a nail
E. Cutting paper
F. Cooking an egg
A, C, and E
Use the data. Which conclusion is best supported?
2 hours of light = 3 cm of seedling height
4 hours of light = 6 cm of seeding height
6 hours of light = 10 cm of seeding height
8 hours of light = 11 cm of seeding height
A. More light always kills seedlings
B. Growth generally increases with more light in the tested range
C. All seedlings grew 11 cm
D. Water amount caused the observed pattern
B. Growth generally increases with more light in the tested range
Two atoms of chlorine have 17 protons but different numbers of neutrons. What are they?
A. Ions of different elements
B. Isotopes of chlorine
C. Two compounds
D. Different elements
B. Isotopes of chlorine
For the equation 2CO + O2 → 2CO2, how many oxygen atoms are on the reactant side?
A. 2
B. 3
C. 4
D. 6
C. 4
Which observation best supports classifying a sample as plasma?
A. Particles are fixed in place
B. It is an ionized gas with charged particles
C. It always has a definite volume
D. Its particles
cannot move
B. It is an ionized gas with charged particles
Label the particle models as element, compound, or mixture.
Model 1: identical single atoms of one type
Model 2: identical bonded pairs of two different atom types
Model 3: two different types of unbonded particles together
Model 1: element
Model 2: compound
Model 3: mixture
Select TWO variables that should be controlled when testing how water temperature affects dissolving time.
A. Amount of solute
B. Water temperature
C. Volume of water
D. Time to dissolve
A and C — amount of solute and volume of water
Complete the table. A neutral atom has 15 protons and mass number 31.
Protons: 15
Electrons: ____
Neutrons: ____
15 electrons and 16 neutrons.
Complete the coefficients using the smallest whole numbers.
____ H2 + ____ Cl2 → ____ HCl
H2 + Cl2 → 2 HCl
During the flat part of a heating curve, what happens while energy is added?
A. Temperature rises rapidly
B. Temperature stays constant during a phase change
C. Matter is destroyed
D. Particle
motion stops
B. Temperature stays constant during a phase change
Which equation demonstrates conservation of atoms?
A. H2 + O2 → H2O
B. 2H2 + O2 → 2H2O
C. H2 + 2O2 → H2O
D. 2H2 + 2O2 → H2O
B. 2H2 + O2 → 2H2O
A student’s control group receives no fertilizer. Why is this group useful?
A. It guarantees faster growth
B. It eliminates all variation
C. It provides a comparison without the treatment
D. It changes the dependent variable
C. It provides a comparison without the treatment
When a calcium atom loses two electrons, what ion forms?
A. Ca²-
B. Ca-
C. Ca²+
D. Ca+
C. Ca²+
Match each description to the correct category: ionic or covalent.
Transfer of electrons: ____
Sharing of electrons: ____
Attraction of positive and negative ions: ____
Transfer: ionic
Sharing: covalent
Ion attraction: ionic.
Match states to properties. Solid, Liquid, or Gas?
Definite shape and volume: ____
Definite volume only: ____
Neither definite shape nor definite volume: ____
Solid, Liquid, or Gas
Construct an evidence-based conclusion. Identify the strongest treatment and provide numerical evidence.
Trial A plants grow 8 cm
Trial B plants grow 12 cm
No-treatment control grows 5 cm.
Trial B is the strongest treatment with 12 cm versus 8 cm for Trial A and 5 cm for the control.