Changes in Matter
What kind of change happens when ice melts into water?
Physical Change
Name one sign that a chemical change has occurred.
Evidence of:
- Gas Production
- Temperature Change
- Precipitate Forming
- Unexpected Color Change
A student rolls a toy car across a tile floor, then rolls the same car across a carpet. On which surface would the toy car roll the farthest?
Carpet
If two people push a box in the same direction with 5 N each, what is the net force?
10 N in the same direction
What gas do humans need to breathe?
Oxygen
When paper is torn into pieces, is it a physical or chemical change?
Physical Change
1. Vinegar is in a flask and baking soda is in balloon.
2. Baking soda falls into vinegar from the attached balloon.
3. Bubbling occurs and balloon inflates.
Based on the evidence, What is the evidence of a chemical change?
Bubbling Occurs (Production of a Gas)
Gravitational Force
Magnetic Force
One person pushes a box right with 10 N and another pushes left with 6 N. What is the net force?
4 N to the right
What tool measures temperature?
Thermometer
What type of change happens when metal rusts?
Chemical Change
Samantha leaves her black iron chair outside in the backyard. After several weeks of rain and sunshine, she notices that the chair is starting to get covered in a reddish-brown substance. Which is the best explanation for what happened to the chair?
What type of Force is at work?
A car driving on a road- The tires of the car experience resistance against the road surface, allowing the car to move forward without slipping
Friction Force
If forces are equal and opposite, what kind of forces are they?
Balanced Forces
In what unit do we measure forces?
Newtons (N)
What happens to a substance during a physical change?
The stay the same.
A student mixes two clear liquids and the mixture turns yellow. What evidence of a chemical change is that?
Unexpected Color Change
What force pulls objects toward Earth?
Gravity
What happens to an object when unbalanced forces act on it?
Object changes motion/ moves
What scientist developed the theory of gravity after watching an apple fall?
Isaac Newton
A log burns and leaves behind ashes. Is this a physical or chemical change and why?
Chemical Change
A white powder is mixed into water and the cup feels colder. What evidence of a chemical change is this?
Temperature Change
What kind of force acts upward on a book resting on a table?
Normal Force
A toy car is pushed forward with 12 N and friction pushes backward with 7 N. What is the net force and direction?
5 N forward
What do we call animals that only eat plants?
Herbivore