What does it mean to have a control group

2 answers:

4 0

The control group is defined as the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.

Mashcka [7]2 years ago

3 0

Control group is a group in a lab or project that is completely controlled and you know exactly how you want it to go. Example: you have your controlled group of cereal and theyre all froot loops with the same cereal same bowl. the opposite of that would be having the same bowl, same milk, and 3 different cereal brands.

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The periodic table is based on an element's

nasty-shy [4]

Answer:

Atomic number

Explanation:

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2 years ago

Which of the following is an oxidation-reduction reaction?

Alina [70]

Answer:

last choice

Explanation:

oxidation and reduction can be defined in terms of adding or removing oxygen to a compound

oxidation is gaining oxygen

reduction is to loss oxygen

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2 years ago

When preparing for work in the fume hood, be sure to gather all necessary tools, glassware, and chemicals _________ to minimize

andreyandreev [35.5K]

Answer:

In advance

middle

lower

Explanation:

These are the safety precautions needed when carrying out duties in the fume hood.

When planning and preparing to work in a fume hood (a locally designed area to reduce exposure to hazardous fumes). It is advisable to make all equipment readily available at your disposal in advance to reduce and minimize the raising and lowering of the hood sash at intervals.

It is also pertinent to understand that working in the middle of the work surface helps to promote the movement of air and keeps the area neat and tidy.

However, if any case where there is a need to get a new tool or equipment during the process of working in a fume hood, it is advisable to lower the sash at that point in time.

5 0

2 years ago

Effective nuclear charge, Zeff, is defined as:

Alborosie

Answer:

The effective nuclear charge for a valence electron in oxygen atom: $Z_{eff} = 4.55$

Explanation:

Effective nuclear charge $[Z_{eff}]$ is the net nuclear charge experienced by the electron in a given atom. It is always less than the actual charge of the nucleus [Z], due to shielding by electrons in the inner shells.