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zavuch27 [327]
2 years ago
11

A new sunscreen has been developed that is supposed to be more effective at preventing sunburn. 30 participants spray one arm wi

th the new formula, and spray the other arm with the leading formula. After 4 hours in the sun, their skin is evaluated for any redness. What is the purpose of the experiment? Identify the independent variable. Identify the dependent variable. Describe the first group of people in the experiment. Describe the second group of people in the experiment. Identify two factors which are kept constant( same). Which group is the test group? Which group is used for comparison?
Chemistry
1 answer:
faltersainse [42]2 years ago
8 0

Answer:

Explanation:

This question appears incomplete but can however still b answered.

The purpose of the experiment is <u>to test the effectiveness of the new sunscreen</u>.

An independent variable is the variable that is changed (directly or indirectly) during the course of an experiment. The independent variable here are the <u>sunscreen</u>.

A dependent variable is the variable that is been tested in the course of the experiment. The dependent variable here is the <u>redness of the skin</u>.

The first group here (this could be in the missing part of the question, hence response not certain) is the control group. The control group consists of the arms sprayed with the leading/old sunscreen formula.

The second group is the test group. It consists of the arms sprayed with the new sunscreen formula.

The factors that are kept constant (or control variable) are <u>the duration under the sun (4 hrs)</u> and <u>the participants' arms used</u>.

The <u>test group is the second group</u> while <u>the group used for comparison</u> (to be sure the new sunscreen is more effective) <u>is the first group</u>.

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Two: is correct. Pd has (in this case) an atomic mass of 114 and its number is 46

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4 0
2 years ago
Partitioning of toxic chemicals in the environment refers to:
shtirl [24]

Answer:

The correct answer is b movement between different compartments(Such as between water and air).

Explanation:

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What is the molarity of a solution of 14.0 g NH4Br in enough H2O to make 150 mL of solution?
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2 years ago
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Answer is: 8568.71 of baking soda.

Balanced chemical reaction: H₂SO₄ + 2NaHCO₃ → Na₂SO₄ + 2CO₂ + 2H₂O.

V(H₂SO₄) = 17 L; volume of the sulfuric acid.

c(H₂SO₄) = 3.0 M, molarity of sulfuric acid.

n(H₂SO₄) = V(H₂SO₄) · c(H₂SO₄).

n(H₂SO₄) = 17 L · 3 mol/L.

n(H₂SO₄) = 51 mol; amount of sulfuric acid.

From balanced chemical reaction: n(H₂SO₄) : n(NaHCO₃) = 1 :2.

n(NaHCO₃) = 2 · 51 mol.

n(NaHCO₃) = 102 mol, amount of baking soda.

m(NaHCO₃) = n(NaHCO₃) · M(NaHCO₃).

m(NaHCO₃) = 102 mol · 84.007 g/mol.

m(NaHCO₃) = 8568.714 g; mass of baking soda.

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