Question

physical science exam help

1) A scientist carries out an experiment. How could she help other scientists judge the validity of her results?

a. use confusing language in her report
b. let other scientists closely review her work
c. prevent others from seeing her data
d. keep her experimental procedure a secret

2) Which type of graph is best used to show the amount of product formed under different reaction conditions?

a. box and whisker plot
b. circle graph
c. bar graph
d. scatter plot

3) How are chemical and physical changes different on a molecular level?

a. Chemical changes involve the breaking of bonds in molecules.
b. Chemical changes do not affect bonding between atoms.
c. Physical changes do not involve molecules.
d. Physical changes cause new molecules to form.

Answer 1

Answer:

b. let other scientists closely review her work

d. scatter plot

a. Chemical changes involve the breaking of bonds in molecules.

Explanation:

Scientists publish their work in peer reviewed journals  such that their work can be replicated by independent labs all over the world, and as a result scientific consensus can be reached

Scatter plot shows both positive, negative and no correlation between different amount of products formed under different experimental conditions.  

Chemical changes involves the formation of new bonds and breaking of old bonds such that new products are formed that are chemically completely different from the reactants. In a physical change there is no change in the chemical composition of the material but the substance undergoes a change in phase.  

Answer 2

Answer: B)

Explanation: I got this answer correct thanks to the help of the same answer above