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Burka [1]
3 years ago
14

Ned is designing an experiment to test which hand sanitizer kills the most E. coli bacteria. In order for Ned's results to be va

lid, what must he do?
THE SUBJECT IS SCIENCE
Chemistry
2 answers:
sergiy2304 [10]3 years ago
4 0

Answer:

So the correct answer is "Test the hand sanitizers on bacterial colonies that are kept in the exact same environmental conditions, such as temperature and light level"

Explanation:

There are several ways to make sure the results of an investigation are valid. First, you and others can try to repeat the experiment. In addition, if it is a controlled experiment, you can make sure you have a control, only one independent variable, at least one dependent variable, and constants.

For Ned's results to be valid, he needs to test the hand sanitizers on bacterial colonies that are kept in the exact same environmental conditions, such as temperature and light level.

Molodets [167]3 years ago
3 0
Need more info please 
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• Write the chemical formulae of the following:-
a_sh-v [17]

The chemical formulae of the given compounds are as follows:

  • Magnesium chloride: MgCl₂
  • Aluminium chloride: AlCl₃
  • Calcium oxide: CaO
  • Calcium carbonate: CaCO₃
  • Copper nitrate: Cu(NO₃)₂

<h3>Chemical formulae</h3>

A chemical formulae a set of chemical symbols showing the elements present in a compound and their relative proportions in that chemical compound.

The information provided by a chemical formula include:

  • The atoms of elements present in the compound
  • The ratio in which the elements are combined in the compound
  • The state in which the compound occurs

The chemical formulae of the given compounds are as follows:

  • Magnesium chloride: MgCl₂
  • Aluminium chloride: AlCl₃
  • Calcium oxide: CaO
  • Calcium carbonate: CaCO₃
  • Copper nitrate: Cu(NO₃)₂

Learn more about chemical formulae at: brainly.com/question/8007130

6 0
3 years ago
Read 2 more answers
Which do all cells need in order to function?
vazorg [7]
Oxygen, should be correct
sometimes we use and need mandatory
8 0
3 years ago
Write the complete and balanced combustion reaction for H2+O2—&gt;
Bas_tet [7]

Answer:

2H2 + 02 --> 2H20

Explanation:

H2 + 02 --> H2O

H =2x2 = 4                |   H = 2 x 2 = 4

                                 |

O =2                          |   O = 1 x <u>2</u> = 2

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7 0
3 years ago
The process of ____ occurs when magma, lava, or a solute in a solution becomes a solid and the internal components will arrange
satela [25.4K]

Answer:

D. Crystallization

Explanation:

Let's clarify the irrelevant terms first.

  1. unification: This term has nothing to do with chemistry at all
  2. lithification: When the problem mentions magma and lava, you might think that this term is related to the process here. However, 'lithification' <em>do </em>have a precise meaning in geology. It refers to the process where sediments collapses into one single rock under pressure, which has nothing to do with the process mentioned here.

Now, for 2 terms that might confuse you: 'solidification' and 'crystallization' these also has precise scientific definition

Solidification is defined the process where substances in <em>liquid</em> phase changes its phase to <em>solid</em>. On first glance, this answer might seems correct, and yes, it is correct for this question. But not the <em>most</em> correct.

The keyword here is  

 'the internal components will arrange its self in an  organized pattern.'

Crystallization is a special case of Solidification where the atoms or molecules of liquid solidify by spontaneously arrange themselves in periodic, ordered, and organized pattern. It might or might not happen during solidification depending on cooling rate, viscosity of liquid, and other factors.

So, Crystallization is the most correct answer here.

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3 years ago
Convert 2.4 kg into cg.
DerKrebs [107]
Your answer is 240000

3 0
4 years ago
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