Review

Students design an experiment to determine how much force is needed to move blocks of wood of different masses slowly across a lab table. Which procedure should students include in their design? (5.6D)

• Conduct five trials, using a different scale to pull each block of wood

• Conduct five trials, pulling a different side of each block each time

• Conduct five trials, using a different table for each trial

• Conduct five trials, pulling each block of wood in the same way for each trial

Tags

NGSS.MS-PS2-2

The diagrams show two trials of an experiment in which a spring scale was used to measure force. This experiment can be used to determine--- (5.6D)

• how mass affects the force needed to move objects

• how force affects the mass of two objects

• how the fore used to pull a dictionary affects the mass of a box of marbles

• how the mass of a box of marbles affects the mass of a dictionary

Tags

NGSS.MS-PS2-2

A student observes that the craters on the moon are different sizes. The student designs an experiment to study the formation of craters. The materials for the experiment are marbles and a pan of flour. The student makes a hypothesis that the size of the craters made on the surface of the flour will depend on the height from which the marble is dropped. Some of the steps in the student's experiment are described in the picture. Which of these is most likely Step 3 in the student's experiment? (5.6D)

• Drop the same marble from different heights into the pan of flour

• Drop marbles of different masses from the same height into the pan of flour

• Drop marbles of different sizes from different heights into the pan of flour

• Drop a single marble one time into the pan of flour

A student poured equal amounts of water and cooking oil into a jar. The student placed a lid on the jar and shook the mixture for five seconds and then let the jar sit for ten minutes. The results of this investigation are shown.

Which conclusion best compares a property of cooking oil and water shown in this investigation?

• Cooking oil is less dense than water.

• Water is less dense than cooking oil.

• Water dissolves in cooking oil.

• Cooking oil dissolves in water.

Tags

NGSS.MS-PS1-2

If the TOTAL weight of the water, Kool-aid, and sugar stayed the same before and after mixing the ingredients, what could be a possible reasoning about what you have learned:

• The reason I believe the weight is different before and after the substances are mix is because the sugar dissolves into the water and disappears.

• In class, we learned that when 2 or more substances are combined, the weight of the combined substances will stay the same.

• Based on our experiments in class, the weight stays the same before and after mixing because the scale showed the same number.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Use the scenario to answer the next two questions

Making solutions

Solutions are mixtures that are very common in our daily lives. A solution is composed of a solute and a solvent.

A student conducted an investigation using 50 milliliter of distilled water and 5 grams of table salt. The water for each test was brought to a certain temperature before the salt was added. The data from the investigation are shown in the graph.

Which conclusion best describes the data in the graph?

• Increasing the amount of solvent increases the temperature of a solution

• Increasing the temperature of the solute increases the amount of the solution

• the amount of solute in a solution determines the time needed for the solute to dissolve in the solvent

• A decrease in the temperature of a solvent increases the time needed for a solute to dissolve in a solvent

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The diagram shows what happens when wood is burned

Burning Wood

^{wood + oxygen} = ^{ashes+carbon dioxide gas + water}

^{(starting) ------------------------------ (ending)}

Which statement best explains the change that occurs when wood is burned?

• This is physical change because the products can be changed back into wood

• This is physical change because the products are different from the starting materials

• This is chemical change because the products can be changed back into wood

• This is chemical change because the products are different from the starting materials

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The diagram below represents the saltwater solution made by the student. When salt (NaCl) molecules are added to water (H2O), they break into one sodium (Na) particle and one chlorine (Cl) particle.

Chose the name of the solvent and solute

• Solute = H2O Solvent=NaCI

• Solvent = H2O Solute= NaCl

True or False?

Gravity pulls only on magnetic objects, but magnetism pulls on everything.

• True

• False

When an apple falls to the ground, what is happening?

____ pulls the apple ____ towards the Earth

• Friction, down

• Gravity, down
• Gravity, out

• Weight, in

Tags

NGSS.MS-PS2-4