VOCAB
Physical And Chemical Properties
Physical and Chemical Changes
Elements, Compound and Mixtures
Law of Conservation of Mass/ Definite Proportions
100

Matter that is uniform and unchanging is called a ________.

pure substance (substance)

100

A _________ ___________ is a characteristic that can be observed or measured without changing the sample's composition.

physical property

100
You have a piece of paper. Give an example of a physical change.

Cutting the paper into pieces, crumpling the paper into a ball, etc....

100
A(n) __________ is a combination of two or more pure substances in which each pure substance retains its individual chemical properties. 

mixture

100

State the Law of Conservation of Mass.

Mass of reactants = mass of products

200

This state of matter has no definite shape and no definite volume

gas

200

Give one chemical property of milk

curdles with Diet Coke, dehydrated creamer is flammable

200

You have a piece of paper. Give a chemical change that can occur. 

Burn the paper in a fire, bleaching the paper white

200

Steel is an example of an ________ --a homogeneous mixture or solution of iron and carbon.

alloy

200

Explain how to find the percent by mass.

Take the mass of the element and divide by the mass of the compound. Multiply by 100 to make it a percent.

300

Homogeneous mixtures are also called __________

solutions

300

Give an example of a physical property of milk

It is white, a liquid at room temperature, there is little smell

300

What are two signs a chemical reaction has occurred?

Products have different properties than reactants, bubble formation, solid formation (precipitate), color change, temperature change, light production, change in smell or odor production
300

How can you recognize if something is an element if you are unsure, but given the name?

Look for it on the periodic table.

300

A 28.0 gram sample of nitrogen gas combines completely with 6.0 grams of hydrogen gas to form ammonia. What is the mass of ammonia formed? Write out the equation to illustrate your answer.

Nitrogen gas + hydrogen gas ------> ammonia

(28.0)          +       (6.0)                      (34.0)

400

In a reaction, _____________ form ____________.

reactants, products
400

Copper forms a deep blue solution when in contact with ammonia. Is this a physical or chemical property? Explain. 

It is a chemical property because copper is changing into another substance with new properties. 

400

Describe the result of a physical change. 

A substance does not change it's composition (what it's made up of), but changes it's appearance. Examples melting, bending, tearing.

400

___________ is a way to separate mixtures based on differences in boiling points. 

Distillation

400

What is the percent by mass of bromine in MgBr2?

86.8%

500

We have 118 known ________ and they are organized in the _________ _________.

elements, periodic table

500

Changing states (liquid water into ice) is an example of a ________ property. Why?

Physical--The substance is just changing form and can be changed back to the original substance by adding/removing energy. It's composition is not changed.

500

If I pour 100 mL of water from a water bottle, into a beaker, does its volume change? (Does it take up more or less space?)

It's volume does not change. 100 mL may look different depending of the shape/size of the container, but it will still be 100 mL when measured.

500

Hydrogen is a gas and oxygen is a gas, but when they are combined together chemically, they can produce a liquid. Explain how this is possible.

If a chemical change occurs, the product will have different properties than the reactants that make it up.

500

If given 6.0 grams of water, how many grams of oxygen could you collect if you could separate it from hydrogen?

5.3 grams of oxygen

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