15.2 science study

What is an element?

All atoms are the same

The scattering of light by colloids is called ____

A. Air pollution B. Conservation C. Suspension D. The Tyndall affect

Orange juice being made from fresh oranges is a: A. Physical change B. Physical property C. Chemical change D. Chemical property

A. Physical change

The wall was blue is a: A. Physical change B. Physical property C. Chemical change D. Chemical property

B. Physical property

___ is another name for a homogeneous mixture. A. Liquid B. Solution C. Substance D. Suspension

B. Solution

____Is a way to separate a mixture using the physical property of boiling point.

Distillation

When magnesium reacts with chlorine, it produces magnesium chloride. If 32g of chlorine react and produce 57g of magnesium chloride, how many grams of magnesium reacted?

25 g

When hydrogen reacts with chlorine, the product is hydrochloric acid. If 25 g of hydrogen react completely with 500 g of chlorine, how many grams of hydrochloric acid are formed?

525 grams

Three examples of physical change are ___ A. Boiling of water, bursting of a balloon, and crumpling a piece of paper B. Burning of gasoline, rotting of an egg, and exploding fireworks C. Freezing of water, evaporation of gasoline, and a rusty nail D. Sawing of wood, crushing a can, and toasting of marsh mellow

A

What physical property could you use to separate a solution of two liquids?

Boiling point, physical property, distillation

How does physical weathering change rocks?

Breaks it a part

All of the following are examples of physical changes except ____ A. Melting B. Evaporating C. Burning D. Solidifying

C. Burning

Plant making food out of water and carbon dioxide is a: A. Physical change B. Physical property C. Chemical change D. Chemical property

C. Chemical change

A ____ property is a characteristic of something that allows it to change to something new.

Chemical

Using oxygen to separate Molten copper sulfide into copper and sulfur dioxide is a ____ change.

Chemical

When the lightning converts to oxygen gas, 02, into Ozone, 03, it is a ____

Chemical

What is the difference between a physical change and a Chemical change?

Chemical change is any change that results in the formation of new chemical substances Physical change rearranges molecules but doesn't affect their internal structures

What are 3 examples of physical properties?

Color smell freezing point boiling point melting point magnetic? opacity viscosity density

One of the chemical properties of acids is that it...

Corrodes metal

Which of the following is an example of chemical change? A. Painting a house B. Freezing water C. Bending steel D. Burning paper

D. Burning paper

When a log burns in a fire, ___ A. A physical change has occurred B. Mass is gained C. Mass is lost D. New substances are formed

D. New substances are formed

Explain how you separate a mixture of sand and sugar

First, you put the sand and sugar into water and stir until the sugar dissolves. Then, filter the water to separate the sand. There is still sugar in the water, so you heat the water to distill it, leaving the sugar behind.

What are 3 examples of chemical properties?

Flammability Heat of Combustion Toxicity Ability to Rust Ability to Burn

Give two signs that a chemical change has occurred

Gas has been produced Rust

What is matter?

Has mass and takes up space

What is a homogeneous mixture?

Layers/Components are not visibly distinct

What is a heterogeneous mixture?

Layers/Components are visibly distinct

Te freezing of water is a ____ change

Physical

The color of a substance is ___ property

Physical

Fresh pickle juice has a light green color. Is it a colloid, a solution, or suspension?

Solution

What is the Law of Conservation of Mass

There is no mass change during a chemical or physical change. Total mass of the products must equal the total mass of the reactants.

What is a compound?

Two or more elements combined

What is a mixture?

a substance made by mixing other substances together. Heterogeneous

What is the Tyndall effect?

is light scattering by particles in a colloid or particles in a fine suspension. It is named after the 19th-century physicist John Tyndall.

What is a substance

particular kind of matter with uniform properties. homogeneous