Unit 1 Exam

1.) What is the difference between a qualitative and quantitative observation?

Qualitative observation is where we only need the meaning, concepts, or the characteristic of what we are observing,

Quantitative observation is where need mathematics, numbers, statistic..etc, in our observation.

For example: qualitative observation  → The water is very cold.

For example: quantitative observation → The water is approximately 2 degree Celsius.

2.) Ellie realizes that all of her plants die within a few months of her care.  She wants to check the effectiveness of fertilizer. She gives 6 plants in group A fertilizer, and 6 plants in group B no fertilizer.  She then measures the growth of the plants to see if the fertilizer helps them grow.

What is the control group? 

6 plants in group B with no fertilizer  

What is the experimental group?

6 plants in group A with fertilizer

What is the independent variable?

the effectiveness of fertilizer 

What is the dependent variable?

growth of plants

3.) What is the difference between precise and accurate?

Precision is (when you’re doing an experiment) how do you get the same answer when you’re using the same method, while accuracy is how close you are in getting to the correct answer.

4.) Convert the following numbers to scientific notation:

  1. ) 0.00432 → 4.32*10^-3 b.) 34500 → 3.45*10^4

5.)  If you measured the area of something that had a length of 5.0m and a width of 3.456m, how many significant figures would be in your answer?

The answer should have only 1 significant figure and with the rounded value because the fewest decimal place in the problem has only one sig fig

For example = 5.0*3.456 = 17.2800   but since the fewest decimal place in the problem has only one sig fig, the answer should be 17.3

6.) How many significant figures are in each of the following measurements?

  1. 3400 cm → 2 sig figs
  2. 0.00043200 L → 5 sig figs

C = K- 273      

7.)  If a thermometer reads  340C, what would the temperature be in Kelvin?

C = K-273 → K = C+273 = 34+273

= 307 Kelvin

Leave a Reply

Your email address will not be published. Required fields are marked *