Unit #1 Chem-Is-Try

Homework

Name: ______Date:______period:____

Chapter 1 Introduction to Chemistry

PS#1: Scientific Method/Inquiry

Directions: Read the scenario on the left and answer the questions on the right.

Pure water freezes at 0ºC. A Student wanted to test the effect of adding salt to the water. The table shows the data that was collected.
Effect of Salt on Freezing Point of Water
Salt Added / Freezing Point
5g / -4.8ºC
10g / -9.7ºC
15g / -15.1ºC
20g / -15.0ºC
/ 1.What is the title of the experiment?
2.What are the Independent and dependent variables?
3.Write a research question for this data
4.Why must the volume be the same for each test?
5.Based on the data, make a claim for this experiment.
Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, Smithers counts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks. / 1. What is the Independent Variable?
2. What is the Dependent Variable?
3. Write a research question for this experiment.
4. State a claim with evidence for this experiment.
  1. How could this experiment be improved?

Krusty was told that a certain itching powder was the newest best thing on the market, it even claims to cause 50% longer lasting itches. Interested in this product, he buys the itching powder and compares it to his usual product. One test subject (A) is sprinkled with the original itching powder, and another test subject (B) was sprinkled with the Experimental itching powder. Subject A reported having itches for 30 minutes. Subject B reported to have itches for 45 minutes. / Identify the:
1. Independent Variable
2. Dependent Variable
3. State a claim for this experiment.
4. Give evidence for your claim.
5. How could this experiment be improved?
Lisa is working on a science project. Her task is to answer the question: "Does Rogooti (which is a commercial hair product) affect the speed of hair growth". Her family is willing to volunteer for the experiment. / Design an experiment on how Lisa would answer her science project question.
Be sure to:
  1. Identify the independent, dependent, and control variables
  2. Write a research question
  3. Write a procedure