Chemical and Physical Changes. Rxn Types. Acids and Bases

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2

A change in the size, shape, or state of matter.

• chemical change
• physical change
• chemical reaction
• electron change

Tags

NGSS.MS-PS1-4

what is the definition of chemical change?

• any change that results in the formation of new chemical substances. 
• changing clothes
• matter cannot be created or destroyed, only change form
• changes affecting the form of a chemical substance, but not its chemical composition.

Tags

NGSS.MS-PS1-2

NGSS.MS-LS1-7

what is the definition of physical change?

• any change that results in the formation of new chemical substances. 
• rusting
• changes affecting the form of a chemical substance, but not its chemical composition.
• any property that is measurable, whose value describes a state of a physical system

Tags

NGSS.MS-PS1-4

Which of the following is NOT an example of chemical change?

• sour milk
• burning wood
• breaking a pencil
• rust

Tags

NGSS.MS-PS1-2

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-2

Exothermic reactions...

• Absorb energy
• Release energy
• Release Color
• Absorb Color

Tags

NGSS.MS-PS3-5

In chemical reactions, the law of conservation of mass is......

• disobeyed
• not true
• obeyed
• used sometime

Tags

NGSS.MS-PS1-5

Which of the following is a chemical property of water?

• Reacts with pure sodium.
• Boils at 100 ^oC.
• Dissolves sugar easily. 
• Has a density of 1 gm/mL

Tags

NGSS.MS-PS1-2

Define a Chemical Property

• A property which depends on the objects size or matter.
• A property of matter not involving in its manifestation a chemical change
• A property or behavior of a substance which undergoes a chemical change or reaction.
• A property which makes the object smell or taste different.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1