WorksheetsCategory 2 STAAR Science
Total questions: 25
Worksheet time: 25mins
A student observes ice forming on the edge of a school building. At what temperature did the water outside the school building most likely begin to change to ice?
100*C
32*C
25*C
0*C
Students prepare a solution of instant tea and place 30 mL of the solution in a Petri dish. Which answer choice best explains what happens to the solution when it is placed in a dry, warm location for 3 days?
The solution will evaporate and the Petri dish will be empty.
The solution will not change.
The water will evaporate and the instant tea will remain in the Petri dish.
The water will condensate and the instant tea will remain in the Petri dish.
Solubility is a measure of:
The concentration of a homogeneous mixture
The concentration of a heterogeneous mixture
How easily a substance dissolves into another substance
How easily a substance will dissolve a substance
Put the liquids in order from most dense to least dense?
4, 3, 2, 1
1, 2, 3, 4
3, 4, 2, 1,
4, 3, 1, 2
What is the primary function of the chloroplasts in plant cells?
To break down sugar molecules to release energy
To store water and nutrients
To capture light energy and convert it into chemical energy
To control the entry and exit of substances in and out of the cell
What is the process by which plants release water vapor into the air through their leaves?
Condensation
Transpiration
Evaporation
Precipitation
In the water cycle, which process involves water vapor cooling and changing into liquid water?
Evaporation
Condensation
Precipitation
Transpiration
What is the term for the amount of matter in an object?
Weight
Density
Mass
Volume
Which of the following is NOT a renewable resource?
Solar energy
Wind energy
Coal
Hydroelectric power
What type of symbiotic relationship benefits one organism without harming the other?
Mutualism
Commensalism
Parasitism
Predation
Which of the following is an example of a physical change?
Rusting of iron
Burning of gasoline
Dissolving sugar in water
Cooking an egg
Which of the following is a chemical change?
Dissolving salt in water
Boiling water
Burning wood
Melting ice
Students collected data on the appearance of four substances and how they reacted when mixed with water. Which substances dissolved when mixed with water?
A and B
A and C
B and C
C and D
A student observed liquid wax dripping down the side of a burning candle. After putting out the candle’s flame, the student left the room. Several hours later the student observed that there was no longer any liquid on the side of the candle. Which statement explains what most likely happened to the liquid wax?
The heat given off by the flame caused the candle wax to evaporate.
The liquid wax changed back into a solid as it cooled.
The liquid wax condensed and was absorbed by the candle.
None of the above
3.5C - A student makes a model of the water cycle by using a cup, some water, and plastic wrap. After the student places the model near a sunny window, moisture forms on the inside of the plastic wrap.
Freezing
Condensation
The warming of air
The formation of clouds
What is the primary function of the mitochondria in animal cells?
To produce energy in the form of ATP
To store genetic information
To synthesize proteins
To control cell division
Which of the following best describes the process of photosynthesis?
Conversion of chemical energy into light energy
Conversion of light energy into chemical energy
Conversion of thermal energy into mechanical energy
Conversion of mechanical energy into thermal energy
What is the term for the movement of water across a semipermeable membrane?
Diffusion
Osmosis
Active transport
Facilitated diffusion
Which of the following is an example of a chemical reaction?
Melting ice
Boiling water
Burning wood
Dissolving sugar in water
What is the role of decomposers in an ecosystem?
To produce energy through photosynthesis
To break down dead organisms and recycle nutrients
To compete with other organisms for resources
To provide shelter for other organisms
Which of the following is a renewable resource?
Natural gas
Coal
Wind energy
Petroleum
What is the process by which liquid water changes into water vapor?
Condensation
Evaporation
Precipitation
Transpiration
Which of the following best describes the function of the cell membrane?
To provide structural support to the cell
To control the movement of substances in and out of the cell
To store nutrients and waste products
To synthesize proteins
What is the main purpose of the respiratory system in humans?
To transport nutrients throughout the body
To exchange gases between the body and the environment
To break down food into nutrients
To protect the body from pathogens
Which of the following processes is responsible for the formation of clouds?
Evaporation
Condensation
Precipitation
Transpiration
