just a help Essay examples

Submitted By bananeta
Words: 6539
Pages: 27

Question 1 (10 points)
Which of the following is not appropriate behavior in lab? a wearing goggles b wearing sandals c moving with caution near lab materials d tying back long hair
Question 2 (10 points)
What should you do if you spill a small amount of acid on your hand? a rinse yourself with the chemical shower and let an adult in the room know b wash yourself in the eyewash and let an adult in the room know c wrap yourself in the fire blanket and let and adult in the room know d rinse your hand in the sink and let and adult in the room know
Question 3 (10 points)
Which of the following items is permitted in the science laboratory? a candy b chewing gum c food d bottled water e all of the above are permitted
Question 4 (10 points)
What should you do if you break a piece of glassware? a let an adult in the room know immediately b throw the shards into the broken glass disposal box c sweep the shards in to the garbage d just go get a replacement for the glassware

Question 5 (10 points)
What is the correct order for lab safety procedures? a put on safety gear, read entire lab procedures, get out lab materials b get out lab materials, read entire lab procedures, put on safety gear c read entire lab procedures, put on safety gear, get out lab materials d it doesn’t matter what order as long as you come to the same result
Question 6 (10 points)
Which of the following methods is the safest way of heating liquids? a heat the liquid in a closed container on a hot plate b heat the liquid in a beaker on a hot plate, while wearing goggles c heat the liquid in a test tube, pointed towards you, over a flame d heat the liquid in a beaker over a flame, while you hold the beaker with tongs
Question 7 (10 points)
When you finish working with chemicals, biological specimens, and other lab substances, always a treat your hands with skin lotion. b wash your hands thoroughly with soap and water. c wipe your hands on a towel. d wipe your hands on your clothes.

Question 8 (10 points)
Mr. Padilla, Facilities Coordinator for Falls Church City Schools, wanted to determine whether the more expensive “Steel Brand” floor wax was better than the cheaper “Giant” floor wax at protecting floor tiles against scratches. One liter (1L) of each type of floor wax was applied to each of 5 test sections of the main hall of George Mason High School. The test sections were all the same size and were covered with the same kind of tiles. Five (5) other test sections received no wax. After 4 weeks, the number of scratches in each of the test sections was counted. Below are the collected data: Number of scratches
Trial section
“Steel Brand” wax
“Giant” wax
No wax
1
35
40
67
2
37
41
65
3
40
33
60
4
33
45
52
5
39
32
58
Average
36.8
38.2
60.4
What is Mr. Padilla’s problem statement or question? a
Do we need to use floor wax at Mason? b
Are five trials necessary when completing an experiment? c
Is “Steel Brand” floor wax better than the cheaper “Giant” floor wax? d
Is “Giant” floor wax better than the cheaper “Steel Brand” floor wax?

Question 9 (10 points)
What is the dependent variable for Mr. Padilla’s experiment? a type of wax used b number of scratches in the test sections c amount of floor wax used d no wax used on some of the tiles

Question 10 (10 points)
What is the independent variable for Mr. Padilla’s experiment? a type of wax used b number of scratches in the test sections c amount of floor wax used d amount of trials conducted

Question 11 (10 points)
What is the control for Mr. Padilla’s experiment? a type of wax used b number of scratches in the test sections c amount of floor wax used d no wax used on some of the tiles

Question 12 (10 points)
What conclusion can Mr. Padilla make from the results? a
Using wax…