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WorksheetsScience Cast
Total questions: 23
Worksheet time: 46mins
Use the graphs and the partial food web to predict the changes in the sea urchin population as the kelp population INCREASES. What will happen to the sea urchin population?
Sea urchin population increases
Sea urchin population decreases
Sea urchin population remains steady
A student conducts 5 trials to investigate factors affecting the formation of impact craters. The student drops a marble into a box with fine powder. Analyze the results in the graph pictured. Because the mass is 40g in each trial, mass is a...
constant
control
dependent variable
independent variable
A student conducts 5 trials to investigate factors affecting the formation of impact craters. The student drops a marble into a box with fine powder to measure the depth. Analyze the results in the graph pictured. Depth is the
constant
control
dependent variable
independent variable
A student conducts 5 trials to investigate factors affecting the formation of impact craters. The student drops a marble into a box with fine powder at different speeds to measure the depth. Analyze the results in the graph pictured. Speed is the
constant
control
dependent variable
independent variable
A student conducts 5 trials to investigate factors affecting the formation of impact craters and here are the results. What is true about the results of the experiment?
As the speed of the marble increases, the depth of the crater increases
As the speed of the marble increases, the depth of the crater decreases
As the speed of the marble increases, the depth of the crater stays the same
A student conducts 5 trials to investigate factors affecting the formation of impact craters and here are the results. Which statement BEST describes the results of the investigation?
The kinetic energy of the marble just before impact is proportional to the depth of the crater it forms
The kinetic energy of the marble just before impact is proportional to the mass of the marble
The depth of the crater is proportional to the mass of the marble
The depth of the crater is proportional to the mass of the marble
Read the question in the photo. Select a moon location in the model that supports the explanation that the New Moon phase explains why the disk becomes a ring.
1
2
3
4
A student reviews the model shown and says that, based on the model, a solar eclipse should happen every time there is a new moon. However, solar eclipses occur less often than New Moons. Which feature of the model should be revised to best explain why solar eclipses do not happen every month?
The model should show that the shape of the Earth's orbit around the Sun is an ellipse.
The model should show that the shape of the Moon's orbit around the Earth is an ellipse.
The model should show that Earth's equator is inclined relative to the plane of Earth's orbit around the Sun.
The model should show that the plane of the Moon's orbit around the Earth is inclined relative to the plane of Earth's orbit around the Sun.
Leah is learning to use properties of substances to identify a chemical reaction. She conducts two trials. In the first trial, she pours silicon dioxide (SiO2) into water (H2O). For the second trial, she pours silver nitrate (AgNO3) solution into a test tube with a solution of potassium chloride (KCl). Look at the diagram. In which trial did a chemical reaction occur?
Trial 1
Trial 2
Both trial 1 and trial 2
No chemical reaction happened in either
Leah is learning to use properties of substances to identify a chemical reaction. She conducts two trials. In the first trial, she pours silicon dioxide (SiO2) into water (H2O). For the second trial, she pours silver nitrate (AgNO3) solution into a test tube with a solution of potassium chloride (KCl). Look at the diagram. Leah knows a chemical reaction occurred in Trial 2 because
a substance with a new properties was made (new white solid)
the same substances remained
Leah conducts two trials to mix chemicals together. What is true about the products of the reaction?
W is a solid substance
X is a liquid substance
Z ia s white solid substance
Y is a solid substance
Leah records properties of the substances she mixed before and after the trials. Which property or properties show that a chemical reaction occurred?
State of matter ONLY
Mass
Color ONLY
Both state of matter and color
Leah made a model of the reaction between Iron and Copper Sulfate. However, it needs improvements. Which statement best describes which improvements need to be made?
The mass of the reactants does not equal the mass of the products.
The number of atoms for the reactants is different than the products
The number of atoms for the reactants is the same as the products
The composition of atoms for the reactants is different than the products
Which model shows a balanced chemical reaction?
According to this model, is the chemical reaction balanced?
Yes
No
According to this model, Fe, or Iron, is represented by
According to this model, what are the products made from the chemical reaction?
Fe
CuSO4
Cu
FeSO4
How many atoms make up CuSO4 ?
1
4
5
6
According to this "Key" that models atoms and molecules, the molecules are
Fe and CuSO4
FeSO4 and CuSO4
Fe and Cu
Cu and CuSO4
According to this "Key" that models atoms and molecules, an example of an atom is
Fe
FeSO4
CuSO4
Leah combined Fe and CuSO4 and measured the masses before and after a reaction. What is the total mass of the reactants?
96 grams
25 grams
71 grams
192 grams
Leah combined Fe and CuSO4 and measured the masses before and after a reaction. What is TRUE about the total mass of the reactants and the total mass of the products?
They are the same (96 grams)
They are different
Leah conducts an investigation by mixing Fe with CuSO4 and makes a model to help explain why the total mass did not change. Leah's model can also be used to show that a chemical reaction occurred because the products
are the same size as the reactants
have the same composition as the reactants
are at different states of matter compared to the reactants
have differently arranged atoms compared to the reactants
