Elements & Compounds
This pure substance is made of only one kind of atom.
What is an element?
Melting ice is this type of change because the substance remains water.
What is physical change?
Tn salt water, this is the substance that dissolves.
What is solute?
A runner travels 100 meters in 20 seconds. The runner's average speed is this.
What is 5 meters per second?
Forces that are equal in strength and opposite in direction are called this.
What is a balanced force?
This substance forms when two or more different elements are chemically joined in a fixed ratio.
What is a compound?
Burning wood is this type of change because new substances form.
What is a chemical change?
In a sugar-water solution, this is the substance that does the dissolving.
What is the solvent?
Speed describes how fast an object moves; this quantity also includes direction.
What is velocity?
When forces on an object are unbalanced, the object's motion can do this.
What is change?
The formula H2O contains two hydrogen atoms and this many oxygen atoms.
What is one?
This kind of change alters a material's size, shape, or state without making a new substance.
What is physical change?
Adding more water to a solution increases its volume and lower its concentration. This process is called?
What is dilution?
On a distance-time graph, a horizontal line means the object's distance is not changing. The object is doing this.
What is remaining at rest?
A book rests on a table. Gravity pulls down while the table pushes up with an equal force. These forces are this.
What are balanced forces?
The formula CO2 contains one carbon atom and this many oxygen atoms.
What is two?
A metal nail rusts after reacting with oxygen. This evidence of a new substance signals this kind of change.
What is a chemical change?
A student wants sugar to dissolve faster in water. Heating the water, stirring it, and crushing the sugar increase these three factors.
What are temperature, agitation, and surface area?
A cyclist travels 60 meters east in 10 seconds. The cyclist's average velocity is this.
What is 6 meters per second east?
Newton's First Law says an object at rest stays at rest, and an object in motion continues in motion, unless acted on by this.
What is an unbalanced force?