Glossary of 4th Grade, Science B1
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- What is a chemical change?
- A change in matter that produces a "different" kind of matter. The properties can be very different from the original.
- What are examples of a chemical change?
- burning wood, bread dough turning into bread, cooking pancakes.
- How does the human body help food go through a physical change?
- Saliva breaks down food, and more changes occur when the food goes into our stomach.
- How does rust form?
- Rust forms when oxygen joins with iron.
- How does tarnish form?
- Tarnish forms when air mixes with copper or silver.
- True of false? Burning is a form of chemical change?
- True. In fact, exploding is the fastest kind of burning. Rockets use this type of chemical change to propel them into space.
- What is mass?
- Mass is the amount of matter in an object. Note, mass is NOT the same as weight. Weight depends on the objects location, mass does not.
- How can you find the mass of an object?
- By balancing it with objects you know the mass of.
- What is the basic unit of measure?
- The gram. Large items are measured in kilograms. Very small objects are measured in milligrams.
- What is density?
- Density is a property of matter. Density is how much mass in a certain volume.
- What is an example of density?
- If you mix the "same" amount of oil and water, the oil will float. This is because the oil has less density than water.
- If two objects have the same mass, but one object is larger than the other, do they have the same density?
- No, smaller object has greater density.
- What are physical changes?
- It is a change that changes the physical properties of matter, but does not produce a different kind of matter.
- Give an example of how you can change matter?
- By heating or cooling it. This may also cause matter to change state. A solid can become a liquid. A change in the state of matter is a "physical" change.
- What is the melting point?
- The point at which a solid changes to a liquid. Different types of matter have different melting points.
- What is the boiling point?
- The temperature at which matter changes from a liquid to a gas. The gasses escape into the air.
- What is the melting and boilng point of water?
- 0 degrees Celsius (32F) for melting. 100 degrees Celsius (212F) for boiling
- What happens when you add energy to water?
- Adding energy causes the temperature to rise. Engery must be added to water in order to boil it.
- What happens when you take energy away from water?
- It cools.
- What is the freezing point?
- The temperature at which matter changes fromo a liquid to a solid. The freezing point of an object is the same as the melting point.
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