Chapter 1 & 3
A non-contact attractive force that exists between all objects that have mass.
gravity
When the forces on an object are balanced, the motion of an object
Won't change
Which of the following are signs of a chemical change?
Formation of a gas, formation of a precipitate, or color change
Which of the following describes a physical change during a wildfire?
The trees are heated, causing the water inside them to evaporate.
Which is held constant when a gas obey's Boyle's law?
temperature
Which form of matter has a definite volume but no definite shape?
liquid
The starting point you use to describe the motion or the position of an object.
reference point
The ability of one material to dissolve in another
solubility
What is a precipitate?
A solid that forms from the reaction of two liquids
What is the formula to find velocity?
Velocity = Distance ÷ Time
Which is the amount of matter in an object?
mass
As you walk, your shoes push against the ground. If the ground did not push back with equal force, gravity would pull you down into the ground. When two objects exert force on each other, the two forces are a
force pair
How can you determine whether the formation of bubbles is the result of a physical change or a chemical change?
By observing if a new substance forms
What happens when you mix vinegar and baking soda?
They form a precipitate of sodium acetate
All waves transfer this from one place to another.
energy
The total length of your path
distance
A non-contact attractive force that exists between all objects that have mass.
gravity
Which of the following is true about color change?
A color change can indicate a chemical change if a new substance is formed.
How does a precipitate form?
By rearranging particles during a chemical reaction
How can you determine whether the formation of bubbles is the result of a physical change or a chemical change?
By observing if new substances formed
Velocity includes both an object's speed and
its direction of travel
Which of the following describes the chemical change that has been occurring during the California wildfires?
The burning of trees produces ash and gases, which are new substances and may contain harmful toxins.
Which describes a physical change during a wildfire?
The burning of trees produces ash and gases, which are new substances and may contain harmful toxins.
Why are heat engines, such as those in most automobiles, not highly efficient?
They convert only about 20-30% of the chemical energy in fuel into mechanical energy, with the rest lost as heat.
Which wave property measures how many waves pass a point in one second?
frequency