Question

Answer as many as you'd like (Please write the number of the one you answer)

Unit 5 - Chemical Reactions

Chemical Change/Law of Conservation

1. What is the law of conservation of mass?



Observing Chemical Change

2. How can Changes in Matter Be Described?



3. How do you identify a chemical reaction?



Describing Chemical Reactions

4. What information does a chemical equation contain?



5. How is mass conserved during a chemical reaction?



6. What are three types of chemical reactions?


Controlling Chemical Reactions

7. How do reactions get started?



8. What affects the rate of a chemical reaction?

Answer 1

1.(when you say mass I think matter) The law of matter states matter can’t be created nor destroyed. An example of this could be the rock cycle. The carbon goes into a volcano becomes lava. Then the volcano explodes the rock ends up in a river and becomes a metamorphic rock after lots of pressure in the river. Then erosion moves the rock and the rock becomes a tiny sediment. It’s so tiny flys in the air then goes back in the volcano becomes a carbon then it can go elsewhere. It can also go through the same process again.

3. A chemical reaction is very different from a physical reaction.Chemical changes rearranged their molecules to make a new substance that is not undo able. One way you can identify them is if they have a gas reaction. A gas reaction is something you can’t undo because it arranged it’s particles into that reaction and gas molecules become carbon molecules in the air. Another way you can find a chemical reaction is seeing a temp change for example food. Once you make a cake you can’t Un bake it.

7. I believe reactions happen because something has effected the thing/object to make it react to it.

Answer 2

1. The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed. For example, the carbon atom in coal becomes carbon dioxide when it is burned. The carbon atom changes from a solid structure to gas but its mass does not change.

2. There are two types of change in the matter: physical change and chemical change.

3. Change in the arrangement of Chemicals

4. A chemical equation consists of the chemical formulas of the reactants (on the left) and the products (on the right). The two are separated by an arrow symbol (read aloud as yields). Each individual substance's chemical formula is separated from others by a plus sign.

5 During the rearrangement of atoms mass is conserved unless u add more substances

6. synthesis, decomposition, combustion,

Step-by-step explanation:

I hope this helps, I don't remember the exact answers,