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exis [7]
3 years ago
5

50 POINTS: PLEASE ANSWER AS QUICK AS POSSIBLE!

Chemistry
2 answers:
Dvinal [7]3 years ago
6 0

Explanation:

The lack of a control group

____ [38]3 years ago
5 0
The answer would be “the lack of a control group.” To make the results more accurate, the scientists should have used a placebo group to use as a comparison.
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The mechanical advantage of a device refers to
Savatey [412]

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Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. The device preserves the input power and simply trades off input forces against movement to obtain a desired amplification in the output force. The model for this is the law of the lever.

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4 0
3 years ago
How many atoms of chlorine are represented below? 9NaCL
Margaret [11]

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there are 9 Chlorine atoms

Explanation:

6 0
3 years ago
Select 2-possible ointment bases. Select one or more:
fredd [130]

Answer:

The correct option is: c. petroleum jelly, d. Polyethylene glycol 4000/600 mixture                

Explanation:

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7 0
3 years ago
2C2H2 + 5O2 → 4CO2 + 2 H2O How many grams of CO2 are required to react with exactly 3.00 mol of O2? 106 g 132 g 165 g 76.8 g
cricket20 [7]

Hey there!:

Given the reaction:

2 C2H2 + 5 O2 → 4 CO2 + 2 H2O

5 moles O2 ------------- 4 moles CO2

3.00 moles O2 ----------  ( moles of CO2 ?? )

moles of CO2 = 3.00 * 4 / 5

moles of CO2 =  12 / 5

moles of CO2 = 2.4 moles

So, molar  mass CO2 = 44.01 g/mol

Therefore:

1 mole CO2 -------------- 44.01 g

2.4 moles CO2 ---------- ( mass of CO2 )

mass of CO2 = 2.4 * 44.01 / 1

mass of CO2 = 106 g

Answer A


Hope that helps!

8 0
4 years ago
Just those 2 questions on the picture please ASAP
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8. Thermal Energy
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3 years ago
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