Solutions
What is another name for homogeneous mixtures?
Bonding structure of a molecule
The chemical formula of a compound does NOT indicate the _______________.
Solid or liquid
A substance that forms a vapor is generally in what physical state at room temperature?
Capitalized
The first figure in a properly written chemical symbol is always...
A mixture is combined with elements and compounds and is a variable composition. A compound is made up of 2 or more elements chemically combined and is a fixed composition.
What is one difference between a mixture and a compound?
they are substances
What is true about compounds?
salt water
Which of the following is a homogeneous mixture?
a) Salt water
b) beef stew
Air
Which of the following CANNOT be classified as a substance?
a) air
b) table salt
substances are compounds and mixtures are not.
what distinguishes a substance from a mixture?
Distillation
Separating a solid from a liquid by evaporating the liquid is called __________.
Gas
Which state of matter takes both the shape and volume of its container?
Salad dressing
Which of the following items is NOT a compound?
a) salad dressing
b) table salt
heat and light
Which of the following is NOT an example of matter?
a) heat and light
b) air
Silver
Which of the following materials is a substance?
a) gasoline
b) silver
Fe
What is the chemical symbol for iron?
Elements and compounds
What do chemical symbols and formulas represent, respectively?
Potassium
Which substance has a chemical symbol that is derived from a Latin name?
a) calcium
b) potassium
Soil
Which of the following is a heterogeneous mixture?
a) soil
b) salt water
Oil and vinegar
Which of the following is a heterogeneous mixture?
a) vinegar in water
b) oil and vinegar
Solid
Which state of matter has a definite shape and a definite volume?
Stainless steel
An example of a homogeneous mixture is:
a) stainless steel
b) noodle soup
letters
Which of the following is used for chemical symbols today?
a) letters
b) drawings
compound
A substance that can be separated into two or more substances only by a chemical change is a:
a) mixture
b) compound
3 states- liquid, solid, gas
In how many physical states does water commonly exist?
Corroding iron
Which action changes the identity of the substance?
a) breaking an ice cube
b) corroding iron
A change in chemical properties
What must occur for a change to be a chemical reaction?
Sucrose
In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, what is/are the reactant(s)?
Ability to react with oxygen?
Which of the following is a chemical property?
a) freezing point
b) ability to react with oxygen
the ability to decompose into hydrogen and oxygen
Which of the following is a chemical property of water at 4 oC?
a) its color
b) the ability to decompose into hydrogen and oxygen
chemical change
When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
Decays
A chemical change occurs when a piece of wood:
a) is split
b) decays
evaporation
Which of the following is a physical change?
a) rotting of food
b) evaporation
Mixing
Which of the following does involve a physical change?
a) mixing
b) decomposing
It is a colorless liquid
Which of the following is a physical property of water?
a) it is a colorless liquid
b) it is composed of hydrogen and oxygen
Smell, taste, shape, texture, color
Know some examples of physical properties of matter.
gas production
Which of the following does indicate that a chemical change may have taken place?
a) gas production
b) fracture formation
The total mass of reactants= total mass of products
Which of the following is true for all chemical reactions?
a) the total mass of reactants= total mass of products
b) the total mass of the reactants increases
Matter is neither created or destroyed
What happens to matter during a chemical reaction?
a) some matter is destroyed
b) matter is neither created nor destroyed
Color and oor, melting points and boiling points
Which of the following are considered physical properties of a substance?
a) color and odor
b) melting and boiling points
Melting cheese
Which of the following is a physical change?
a) melting cheese
b) fermenting of cheese
Rusting
Which of the following is NOT a physical change to metal?
a) melting
b) rusting
the food darkens
Which of the following indicates that a chemical change has happened during cooking?
a) the food darkens
b) bubbles form in bubbling water
0 degrees
What is the melting point of water in degrees Celsius?
100 degrees
what is the boiling point of water in degrees Celsius?
Burning
Which of the following processes does involve a change in chemical properties?
60 grams of liquid
How many grams of liquid water are produced when 60 grams of ice melt?
Kinetic
Energy in the form of motion is ______ energy.
transferred
According to the law of conservation of energy, mechanical energy can be _______ to heat energy.
potential
A rock at the edge of a cliff has _________ energy because of its position.
Cannot
According to the law of conservation of energy, energy ______ be created or destroyed.
potential
Energy that is stored is _____ energy.
Chemical potential
Energy stored in food you eat is ________ energy.
joules
Energy is measured in ______.
Chemical
The law of conservation of mass states that the mass of all substances before a _____ change equals the mass of all the substances after the change.
atom
the basic building block of all matter
compound
a pure substance that is made up of more than one type of atom
element
a pure substance that is made up of only one type of atom
Heterogeneous mixture
A mixture that consists of visibly different substances
homogeneous mixture
A mixture that is uniform throughout
Law of constant composition
Law that states that the ratio by mass of the elements in a chemical compound is always the same, regardless of the source of the compound.
matter
anything that has mass or volume
molecule
the smallest part of a compound
substance
matter that has a uniform and definite composition
chemical change
change that occurs when one substance is turned into another substance
chemical property
property that can be observed only when a substance is changed into a new substance.
physical change
change that does not alter the identity of a substance
physical property
property that can be observed without changing the identity of the substance
chemical potential energy
energy stored in the atoms, molecules, and chemical bonds that make up matter
Energy
the ability to do work or cause change
kinetic energy
energy associated with motion
law of conservation of energy
states that energy cannot be created or destroyed, it can only be changed from one form to another
law of conservation of matter and energy
states that the total amount of mass and energy in the universe is conserved (does not change)
Potential energy
Stored energy
Work force
any push or pull applied over a distance
pure substance
a form of matter that has constant composition throughout