MiStar 6.3

Which statement correctly describes how this reaction affects the mass of the atoms that were previously a part of the water molecules?

• The mass of the atoms is less because they are now a gas.

• The mass of the atoms is the same because atoms of the same type always have the same mass.

• The mass of the atoms is more because a new kind of molecule is formed.

• There is not enough information to tell.

Answer explanation

The mass of the atoms is the same because atoms of the same type always have the same mass.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement correctly describes the relationship between the properties of the products compared to those of the reactants?

• The properties are similar because the same atoms that make up the reactants also make up the products.

• The properties are similar because gases do not strongly affect solids in chemical reactions.

• The properties are different because new atoms have been added during the reaction.

• The properties are different because the atoms in the reactants have been rearranged to form the products.

Answer explanation

The properties are different because the atoms in the reactants have been rearranged to form the products.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following best describes the importance of food to an organism?

• Food is anything that is taken in by an organism.

• Food is anything that is needed by an organism.

• Food is anything that provides matter for the growth of an organism.

• Food is anything that is a source of both energy and matter for the growth of an organism.

Answer explanation

Food is a source of both energy and matter for the growth of an organism, making it the most accurate description among the options provided.

Tags

NGSS.MS-LS1-7

Do you agree that a chemical reaction has occurred? Describe why or why not.

• Yes, because the bag expanded and bubbles of gas formed, indicating a change in the substances.

• No, because the bag's weight did not change, so no reaction occurred.

• Yes, because the lemon juice spilled out of the jar, which is a physical change.

• No, because the baking soda is still visible, meaning no chemical reaction took place.

Answer explanation

The correct choice is 'Yes, because the bag expanded and bubbles of gas formed, indicating a change in the substances.' This is because the formation of gas and expansion of the bag are clear indicators of a chemical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following represents the boundary of the system being investigated?

• The jar

• The bubbles that formed

• The plastic bag

• The atmosphere surrounding the plastic bag

Answer explanation

The plastic bag represents the boundary of the system being investigated as it contains the system and separates it from the surrounding atmosphere.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If the student weighs the bag and everything in it after the bubbling stops and compares the final weight to the starting weight, what will she find out?

• The final weight will be greater than the starting weight because new atoms are produced during the chemical reaction.

• The final weight will be less than the starting weight because some of the atoms are destroyed during the chemical reaction.

• The final weight will be the same as the starting weight because the number of each kind of atom does not change during the chemical reaction.

• The final weight will be the same as the starting weight because some atoms are destroyed, but new ones are created during the chemical reaction.

Answer explanation

The final weight will be the same as the starting weight because the number of each kind of atom does not change during the chemical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following molecules would you predict would be the result of the last chemical reaction in the digestion of carbohydrates as shown in the model?

• A single square

• Two connected squares

• A chain of eight squares

• There is not enough information to answer.

Answer explanation

The correct choice is a single square because the last chemical reaction in the digestion of carbohydrates results in a monosaccharide, which is represented by a single square in the model.

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The number and types of atoms are the same in the reactants as in the products. Are the properties of the reactants likely to be different from the properties of the products in the given chemical reaction?

• Yes. When atoms are rearranged, the molecules have different properties, so the products have different properties than the reactants.

• No. Atoms of a certain type always have the same mass, regardless of what molecule they are in, so the products have the same properties as the reactants.

• No. Atoms maintain their properties regardless of how they are organized into molecules, so the products have the same properties as the reactants.

• Yes. The atoms in the reactants are transformed into new types of atoms, and so the products have different properties.

Answer explanation

Yes. When atoms are rearranged, the molecules have different properties, so the products have different properties than the reactants.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which design reached the highest maximum temperature according to the Self-Heating Meal Test Results graph?

• Design 1

• Design 2

• Design 3

• The graph does not show which design reached the highest temperature

Tags

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

Based on the Self-Heating Meal Test Results graph, which design maintained the highest temperature after 30 minutes?

• Design 1

• Design 2

• Design 3

• The graph does not show which design maintained the highest temperature after 30 minutes

Tags

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3