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Ch. 2 Study Guide

Physical Science Chapter 2 Study Guide

QuestionAnswer
A material that can be represented by a chemical formula. Pure substance
Which property of a substance is not affected by physical changes? Reactivity
A chemical change occurs whenever New substances form
Chemical changes can affect physical and chemical properties whereas physical changes can affect Only physical properties
Definition of matter? anything that has mass and takes up space.
Out of the following, which is an element? a. steel c. iron b. bronze d. brass iron
Every sample of matter is either: An element, compound, or a mixture
Why is sound not made of matter? It does not have mass or volume.
What is the smallest unit of a substance that behaves like the substance? Molecule
What is the smallest unit of an element what keeps the element's chemical properties? Atom
What is a substance that is made up of atoms of different elements? Compound
What is a substance that cannot be broken down into simpler substances by chemical means? Element
What does a chemical formula determine? How many elements are in a substance, and how many atoms of each element are in the substance.
What is matter that has a fixed composition and definite properties? pure substance
What are the two types of pure substances? Elements and Compounds
What are the two types of mixtures? Homogeneous and Heterogeneous
What is a combination of substances that are not chemically combined? Mixture
Two or more liquids that can dissolve into each other are referred to as? Miscible
Two or more liquids that cannot dissolve into each other are referred to as? Immiscible
What is a mixture called in which the substances are evenly distributed? Homogeneous
What is a mixture called if the substances are not evenly distributed? Heterogeneous
Are carbonated drinks homogeneous or heterogeneous mixtures? Homogeneous
What are shape and mass an example of? Physical properties
What can be observed without changing the identity of the substance? Physical properties
Digesting food is an example of a(n) Chemical change
The science of what matter is made of and how it changes is called Chemistry
Flammability is a chemical property that tells whether a substance reacts in the presence of? Oxygen
Is dissolving a physical or chemical change? Physical
True or False: Mixtures can be separated by physical changes, but compounds must be broken down by chemical changes. True
What is the temperature and pressure at which a solid becomes a liquid? Melting point
What is the temperature and pressure at which a liquid becomes a gas? Boiling point
The measurement of how much matter is contained in a certain volume of a substance called? Density
What is the capacity of a substance to combine with another substance called? Reactivity
What determines a chemical change? New substances are formed
What is it called when one or more substances are changed into entirely new substances that have different properties? A chemical change
True or false: Melting gold is a chemical change. False; it is a physical change
Salt dissolving in water is an example of a(n)? Physical Change
True or false: Mixtures are not chemically combined. True
Yeast becoming bread is the result of a __________ change. Chemical
True or false: Some chemical changes can be reversed by other chemical changes. True
Ice floats in water because it is ___________________ than water. Less dense
How is the density of an object calculated? Mass divided by volume
How is the mass of an object calculated? Density times volume
How is the volume of an object calculated? Mass divided by density
What is the smallest unit of an element that behaves like the element? Atom
Unlike a mixture, a pure substance has a fixed composition
The science of forces and energy is called? Physics
Are oil and water miscible or immiscible? Immiscible
A mixture of flour and water is called a _______________ mixture because the substances do not dissolve. Heterogeneous
What is a material that can be represented by a chemical formula is called? A pure substance
Created by: Benjamin321
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