Question

What happens to the mass of substances during a physical change?

Answer 1

Here are the answers in order:

1. During a physical change the substance changes physically.

2. The law of conservation of mass is a law stating the conservation of mass cannot be higher than 46mg or lower than 32mg.

3. A hypothesis is a guess that you make before completing a science experiment, it can be considered a law because it is important to know why you are making the guess.

4. During a chemical change the mass is changing colors. This is a representation of a chemical change.

5. Oil is a non-renewable resource, so it cannot demonstrate the conservation of mass.

6. When the color of the substance has changed or when it explodes.

7. Reactants are the objects that react when in a chemical change.

8. If you follow the rule of not going higher than 46mg and not lower than 32mg then it will automatically follow this law.

Chemical Reactions Part One Video:

1. mass

2. erupt-ant

3. reactant

4. object

5. mixtures

6. molecules

7. color changed

Questions again:

1. A chemical reaction

2. A physical change

3. Because if it is no higher than 46mg and no lower than 32mg then it will follow on it's own.

Answer 2

Answer:

1. During a physical change, the mass of a substance remain the same.

2. The law of conservation of mass means that the mass of the products in a chemical reaction must equal the mass of the reactants.

3. A scientific law is a generally acceptable statement base on repeated experiment and results that are derived from extensive testing, research, and observation.

Hypothesis is a monitored observation and result that has not been verified to the some certain degree. It become a law once it is verified to some certain acceptable degree.

4 The mass of a substance changes during a chemical change.

5. In oil creation, this is a need to know the amount of oil in the reservoir and the amount going out. This simple material balance which is govern by law of conservation of mass has helped a lot.

6. A chemical reaction occur when two or more substance come together to for entirely new product accompany by releasing or absorbing heat and formation of precipitate.

7. Reactants are substance coming together to for another substance. A product is the new substance formed.

Section 2

1. Energy

2. Composition

3. Chemical reaction

4. Substance

5. Reactants

6. Products

7. Formed

8.  When bromine reacts with aluminum, a chemical reaction accompany by flash of yellow light and an orange cloud is seen.

9. A physical change occur

10. It represents the law of conservation of mass because its mass is conserve, but it changes from one form to another.