Unit 6 Flashback

Match the following words and definitions from 6.1

• Matter

• anything that takes up space and has mass

• Element

• simplest form of matter from which more complex substances are made

• Compound

• two or more substances physically combined (variable composition)

• Mixture

• two or more elements chemically combined in a fixed proportion

• Substance

• all particles in matter are identical (fixed composition)

Tags

NGSS.MS-PS1-1

Differentiate between a homogeneous mixture and a heterogeneous mixture

Groups:

(a) Homogeneous

,

(b) Heterogeneous

• components are evenly distributed out on a microscopic level

• lemonade

• coffee

• 
• Usually appears “blended”

• bleach

• even distribution; “same”

• substances in the mixture are not evenly spread out

• paint

• Salad dressing

• uneven distribution; “different”

• 
• Different components are easy to see, or separate out over time

• Solutions (when one substance is dissolved into another)

• cereal

Explain the difference between a compound and a mixture.

Fill in the Matter Flowchart based on the information given.

a

b

c

d

e

f

Heterogeneous

Mixture

Element

Compound

Homogeneous

Substance

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Classify each example below as the type of matter it is.

Groups:

(a) Element

,

(b) Compound

,

(c) Homogeneous Mixture

,

(d) Heterogenous Mixture

• Oxygen

• Brass

• Vegetable Soup

• Potting soil

• Water (H₂O)

• Gold

• Tin

• Lemonade

• Carbon dioxide (CO₂)

• Gravel

• Peanut butter

• Table salt (NaCl)

Tags

NGSS.MS-PS1-1

Match the following words and their definitions

• Combustibility

• a measure of how well a solute dissolves in a solvent

• Viscosity

• how easily a substance reacts, usually with an acid or base

• Solubility

• how easily a substance will set on fire

• Oxidation

• • how easily a substance reacts with oxygen

• Reactivity

• a fluid’s resistance to flow

Explain the difference between physical and chemical properties and list examples of each

Groups:

(a) Physical Properties

,

(b) Chemical Properties

• Flammability

• Reactivity

• The substance is still the same

• Luster

• Density

• properties that can only be observed or measured by changing the substance's identity

• Radioactivity

• Volume

• Toxicity

• Combustibility

• a new substance is formed

• Mass

• properties that can be observed directly or measured without changing the substance's identity

• Melting Point

• Solubility

• Oxidation

Tags

NGSS.MS-PS1-4

Classify the changes below as physical or chemical

Groups:

(a) Physical Changes

,

(b) Chemical Changes

• Dry ice turns into a gas

• A red liquid is mixed with a blue liquid and the result is a purple liquid

• Uranium release radioactive particles as it decomposes.

• A piece of tin is cut in half

• Two clear liquids are mixed together and a purple liquid appears.

• Water is boiling in a pot on the stove

• Charcoal is burned in a grill to cook hamburgers.

• A piece of iron rusts when it is exposed to water.

Tags

NGSS.MS-PS1-2

Write out the set up of this problem: A piece of metal is 4cm by 10cm by 2cm. Find its mass if it has a density of 2 g/cm³. (You will not solve, you only need to write out how it is set up into the formula!)

Mathematical Equivalence

ON

A piece of plastic with a mass of 15 g is placed in a graduated cylinder. The water level in the graduated cylinder rises from 30 mL to 55 mL when the plastic is added. You need to find the density, but know you would have to find the volume first. How would you go about doing this?

• Using water displacement by subtracting the final water volume by the initial water volume.

• By multiplying L x W x H

• Using water displacement, subtracting the initial water volume by the final water volume.

• By dividing the mass and the volume.