Question

Petra dropped her beaker on the floor. She placed her gloves on the table. She then started to pick up the small pieces with her hand and place them in the broken-glass container. At the end of lab, she told her instructor that there was broken glass on the floor. The teacher swept it up and placed the glass in the broken-glass container.

Aside from dropping the beaker, how many errors did Petra commit?

one
two
three
four

Answer 1

I need it asap

Answer 2

First error: She took off her gloves. Second Error: She put them on the table. Third error: picking up the glass her hands instead of telling the teacher. Other than dropping the beaker, she made three errors.

Answer 3

thank you

Answer 4

You are welcome. You can tag me by typing @JustSaiyan right here.

Answer 5

k I will Have more to ask here soon ok

Answer 6

I look forward to it.

Answer 7

will. you be on all day

Answer 8

Yes, until 4:00 Eastern Pacific Time.

Answer 9

Which statement best describes how an existing theory is often affected by the development of new technology?

An existing theory is thrown out and replaced with a completely new theory based on the new observations.
An existing theory is modified so that it can explain both the old and new observations.
An existing theory remains the same because a theory is a proven fact that is always true.
An existing theory is kept unchanged while a new theory is developed to explain the new observations.

Answer 10

An existing theory is modified so that it can explain both the old and new observations

Answer 11

Scientists often work on projects for a long time and fail to see sources of error in their research. Which process allows an outside expert to look at the scientist’s project and point to sources of error?

direct funding
peer review
conclusive research
data collection

Answer 12

Peer review

Answer 13

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. The researchers grew one type of bacteria in twenty-four identical covered petri dishes. Then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. They left the remaining six petri dishes closed as a control group. When the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. The researchers concluded that not using any hand sanitizer would lead to the least bacterial growth.

Which statement best explains why the researchers’ conclusion was not justified?
The experiment tested too many variables.
The control group was not treated the same as the experimental group.
The sample size of twenty-four petri dishes is not large enough.
The single type of bacteria is not adequate to make any conclusions.