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