Unit 6 Flashback

Match the following words and definitions from 6.1

• Compound

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

• Mixture

• two or more elements chemically combined in a fixed proportion

• Substance

• anything that takes up space and has mass

• Matter

• all particles in matter are identical (fixed composition)

• Element

• two or more substances physically combined (variable composition)

Tags

NGSS.MS-PS1-1

Differentiate between a homogeneous mixture and a heterogeneous mixture

Groups:

(a) Homogeneous

,

(b) Heterogeneous

• even distribution; “same”

• cereal

• Salad dressing

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

• Usually appears “blended”

• bleach

• paint

• components are evenly distributed out on a microscopic level

• 
• uneven distribution; “different”

• coffee

• substances in the mixture are not evenly spread out

• lemonade

• 
• Solutions (when one substance is dissolved into another)

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

Compound

Element

Mixture

Substance

Homogeneous

Heterogeneous

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

• Lemonade

• Vegetable Soup

• Oxygen

• Table salt (NaCl)

• Tin

• Water (H₂O)

• Potting soil

• Gold

• Peanut butter

• Gravel

• Carbon dioxide (CO₂)

• Brass

Tags

NGSS.MS-PS1-1

Match the following words and their definitions

• Combustibility

• how easily a substance will set on fire

• Viscosity

• a fluid’s resistance to flow

• Solubility

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

• Reactivity

• • how easily a substance reacts with oxygen

• Oxidation

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

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

Groups:

(a) Physical Properties

,

(b) Chemical Properties

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

• The substance is still the same

• Melting Point

• Volume

• Oxidation

• Density

• a new substance is formed

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

• Flammability

• Toxicity

• Reactivity

• Radioactivity

• Combustibility

• Mass

• Luster

• Solubility

Tags

NGSS.MS-PS1-4

Classify the changes below as physical or chemical

Groups:

(a) Physical Changes

,

(b) Chemical Changes

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

• Charcoal is burned in a grill to cook hamburgers.

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

• A piece of tin is cut in half

• Dry ice turns into a gas

• Water is boiling in a pot on the stove

• Uranium release radioactive particles as it decomposes.

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

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.