Nature of Science
What is a hypothesis?
A testable prediction about what will happen in an experiment.
What is matter?
Anything that has mass and takes up space.
What is a physical change?
A change that affects one or more physical properties of a substance without altering its chemical composition.
What is the scientific method?
A systematic process for conducting experiments and making observations.
Name one physical property of matter.
Color, shape, size, mass, or volume.
Give an example of a chemical change.
Rusting of iron or burning wood.
Why is it important to conduct experiments more than once?
To ensure that the results are consistent and reliable.
What does density measure?
The mass per unit volume of a substance.
What is the law of conservation of mass?
Mass is neither created nor destroyed in a chemical reaction.
Name one way scientists communicate their findings.
Through research papers, presentations, or discussions.
How do you determine if an object will float or sink in water?
If the object's density is less than that of water, it will float; if greater, it will sink.
What happens to the molecules during a phase change from solid to liquid?
The molecules gain energy, move faster, and break away from their fixed positions.
What is the difference between a scientific theory and a scientific law?
A theory explains why something happens, while a law describes what happens.
Explain the difference between mass and weight.
Mass is the amount of matter in an object, while weight is the force of gravity acting on that mass.
Describe what happens during a chemical reaction.
Substances (reactants) are transformed into new substances (products) with different properties.