Modeling Conservation of Matter

A student places a living plant in a jar and seals it so nothing can get in or out. He determines the total mass of the jar and everything inside it. Several weeks later, the plant is dead. What will happen to the total mass of the jar and everything inside it after the plant dies?

• The mass will stay the same.

• The mass will increase.

• The mass will decrease.

• It depends on the type of plant.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A reaction occurs between two liquid substances in a sealed jar. What will happen to the mass of the sealed jar and its contents after the reaction occurs?

• The mass will change if a gas is formed, and it will change if a solid is formed.

• The mass will change if a gas is formed, but it will not change if a solid is formed.

• The mass will change if a solid is formed, but it will not change if a gas is formed.

• The mass will not change if a gas is formed, and it will not change if a solid is formed.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A student places some baking soda and a jar of lemon juice in a plastic bag and seals the bag. They weigh the bag and everything in it. They shake the bag so that the lemon juice spills out of the jar and mixes with the baking soda inside the bag. The student observes that bubbles form and the bag expands. 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 they find out?

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

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

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

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

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Two white powders were mixed together. A chemical reaction occurred, and a yellow powder was formed. What is the relationship between the yellow powder and the white powders?

• The yellow powder is made up of the same kinds of atoms as the white powders, but the atoms are combined into different molecules.

• The yellow powder is made up of the same kinds of molecules as the white powders, but the molecules are a different color.

• The yellow powder was released from inside the atoms of the white powders.

• There is no relationship between the yellow powder and white powders.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Atom

• The smallest particle of an element that maintains the chemical identity of that element

• The energy that is stored in all compounds and potentially released in chemical reactions

• he mass of all reactants must equal the mass of all products. Matter is neither created nor destroyed.

• To maintain at a constant overall total

Tags

NGSS.MS-PS1-1

The process by which one or more substances change to produce one or more different substances

• Chemical Energy

• Atom

• Chemical Reaction

• Law of Concervation of matter

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Chemical energy

• The process by which one or more substances change to produce one or more different substances

• To maintain at a constant overall total

• The energy that is stored in all compounds and potentially released in chemical reactions

• The mass of all reactants must equal the mass of all products. Matter is neither created nor destroyed.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Law of conservation of matter

• The process by which one or more substances change to produce one or more different substances

• To maintain at a constant overall total

• The energy that is stored in all compounds and potentially released in chemical reactions

• The mass of all reactants must equal the mass of all products. Matter is neither created nor destroyed.

Tags

NGSS.MS-PS1-5

To maintain at a constant overall total

• Conserve

• Chemical reaction

• Covalent bond

• Atom

Tags

NGSS.MS-PS1-5

Atoms are represented by circles, and molecules are represented by circles that are connected to each other. The different colored circles represent different kinds of atoms. Which of the following could represent a chemical reaction?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1