Describing Matter
Table sugar and salt are examples of
The measurement of the force of gravity on an object is the object's
weight
One example of a physical change is
a. burning paper
b. baking cookies
c. heating table sugar
d. dissolving salt in water
d. dissolving salt in water
The energy of matter in motion is called
Kinetic Energy
What holds atoms together in a molecule?
chemical bonds
Substances that cannot be broken down chemically into other substances
Elements
The measurement of how much matter an object contains is its
mass
One example of a chemical change is
a. filtering
b. burning wood
c. boiling water
d. crushing a can
b. burning wood
radio waves, visible light from the sun, infrared "rays" from heat lamps, the waves that heat food in a microwave oven, ultraviolet rays, and X-rays, are all considered types of
electromagnetic energy
Fireworks exploding in the sky and giving off light are an example of a(n)
exothermic change
All elements are composed of extremely small particles called
Atoms
the measurement of how much mass is contained in a given volume is called
density
What is the ability to do work or cause change
energy
What characteristics listed below do photosynthesis and combustion NOT share?
a. both involve a chemical change
b. both are endothermic
c. both change energy from one from to another
d. both cause changes in matter
b. both are endothermic
A volume of 25 milliliters is the same as a volume of ______ cubic centimeters
25 cubic centimeters
Which of these statements is false?
a. oxygen and copper are examples of elements
b. elements are pure substances
c. atoms of different elements can combine to form compounds
d. atoms of different elements are the same
D. atoms of different elements are the same
The volume of an irregular object can be measured by
a. multiplying the objects length, width, and height
b. dividing the object's density by its mass
c. submerging the object in water in a graduated cylinder
d. placing the object on a triple-beam balance
c. submerging the object in water in a graduated cylinder
the change in which ice absorbs energy and melts is a(n)
a. endothermic change
b. exothermic change
c. chemical change
d. change in mass
a. endothermic change
During photosynthesis, plants transform electromagnetic energy from the sun into
chemical energy
Visible light is one example or _________ energy, a form of energy that travels through space as waves
A(n) __________ is formed when two or more substances are so evenly mixed that you can't see the different parts.
homogeneous mixture
The density if a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams is
6 grams per cubic centimeter
_____________ energy, the total energy of all particles in an object, always flows from warmer matter to cooler matter
Thermal
The burning of a fuel transforms ___________ energy and releases it as thermal energy and electromagnetic energy
chemical
Which of the following is not an example of a chemical change?
a. gas burning on a stove
b. rust forming on an iron fence
c. salt dissolving in a glass of water
d. using electricity to break down water into hydrogen and oxygen
c. salt dissolving in a glass of water