Physical vs Chemical Change, Intensive vs Extensive Property

Extensive properties depend on the ​ ​ (a)   of substance present. Examples include mass, ​ (b)   , and energy. Intensive properties are those that do not depend on the amount of ​ (c)   present. Examples include temperature, (d)   , and (e)   .

• density
• color
• amount
• substance
• volume

Chemical vs Physical Change

A chemical change always results in one or more new ​ (a)   with different properties. Most chemical changes are difficult to ​ (b)   to the original state. Signs like ​ (c)   change, gas release, heat generation, light emission, or a precipitate forming can indicate a chemical reaction. In a physical change only the form or ​ (d)   of the substance changes and are usually reversible, meaning you can return the substance to its ​ (e)   state. 

• substances
• reverse
• color
• state
• original

Tags

NGSS.MS-PS1-2

Categorize as a physical or chemical change

Groups:

(a) Physical Change

,

(b) Chemical Change

• digesting food
• rusting iron
• souring milk
• boiling water
• exploding fireworks
• melting ice
• baking a cake
• shredding paper
• dissolving sugar in water
• mixing sand and salt
• burning wood
• fermenting grapes
• dissolving salts in water

• breaking glass
• chopping wood

Tags

NGSS.MS-PS1-2

Calculate the density of the hydrogen samples 1,2, and 3 to the correct number significant figures.

Groups:

(a) 1

,

(b) 2

,

(c) 3

,

(d) significant figures or calculation?

Tags

NGSS.MS-PS1-2

Calculate the density of the hydrogen samples 4, 5, and 6to the correct number significant figures.

Groups:

(a) 4

,

(b) 5

,

(c) 6

,

(d) significant figures or calculation?

Calculate the density of the hydrogen samples 4, 5, and 6 to the correct number significant figures.

Groups:

(a) 7

,

(b) 8

,

(c) 9

,

(d) significant figures or calculation?

What pattern do you observe in the data?

Groups:

(a) True

,

(b) False

• The density does not change from sample to sample

• The density of the solids is lower than the gases

• All these elements react with oxygen

• The density does change from sample to sample

• The density of the gases is lower than the solids

Tags

NGSS.MS-PS1-2

1. The properties of matter can be classified into two groups. Extensive properties vary with the amount of matter in a sample. Intensive properties remain the same, or are independent of the amount of matter present. Analyze the data in the table to identify examples of extensive and intensive properties. Explain your classifications.

Groups:

(a) Extensive Property

,

(b) Intensive Property

• Color

• Density

• State

• Appearance

• Volume

• Mass

• Reactivity

1. A classmate claims that state of matter is an extensive property because it can vary with temperature. For example, hydrogen changes into a liquid at very low temperatures and high pressure, while iron can melt into a liquid at very high temperatures. Do you agree with the classmate? Write an argument to support your position.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

1. Apply Concepts  Two chemists each plan an investigation in which they will combine hydrogen gas with chlorine gas to observe the chemical reactivity. The plans differ in that one will use 25 milligrams each of hydrogen and chlorine, and the other will use 1000 times this amount, i.e., 25 grams each of hydrogen and chlorine. Can the investigations reach similar conclusions about the reactivity of hydrogen with chlorine? Explain.

Tags

NGSS.MS-PS1-2