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RSB [31]
2 years ago
14

What is a Control trial

Chemistry
1 answer:
AleksandrR [38]2 years ago
8 0
It is a trial aimed to reduce bias during an experiment. An example would be a sugar pill, something that has no real effect so that the results of the true trial can accurately be compared. Its like a control group.
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An envelope could be a source of DNA evidence.<br><br> True<br><br> False
yuradex [85]

Answer:

True

Explanation:

DNA can be extracted from bite marks, cigarette buds, postage stamps on envelopes, and envelope flaps for DNA analysis.

7 0
2 years ago
Read 2 more answers
If nitrogen-13 has a half life of 2.5 years, how much remains from a 100g sample after 7.5 years
Sonbull [250]

Answer:

12.50g

Explanation:

T½ = 2.5years

No = 100g

N = ?

Time (T) = 7.5 years

To solve this question, we'll have to find the disintegration constant λ first

T½ = In2 / λ

T½ = 0.693 / λ

λ = 0.693 / 2.5

λ = 0.2772

In(N/No) = -λt

N = No* e^-λt

N = 100 * e^-(0.2772*7.5)

N = 100*e^-2.079

N = 100 * 0.125

N = 12.50g

The sample remaining after 7.5 years is 12.50g

5 0
3 years ago
What is the difference between an Isotope and an Allotrope?
Kaylis [27]
Allotropes are elements on the periodic table that have more than one crystalline form . There are three forms of the element carbon : Diamond, Graphite, and Fullerenes. Isotopes are atoms of the same element with the same atomic number but have a different mass number.
8 0
3 years ago
The solubility of a salt in a given volume of water depends primarily on the A) surface area of the salt crystals B) temperature
Darina [25.2K]

Answer:

The correct answer to the following question will be Option B (temperature of the water).

Explanation:

  • The solubility of that same salt which appears whenever the substance is added in some kind of a fluid which already incorporates another origin of many of its atoms.
  • The solubility of such a substance throughout a given quantity of water is predominantly dependent on the whole of the water temperature.
7 0
3 years ago
An element belongs to group 4 and period 3. How many electrons does it have in its outermost shell and how many electronic shell
KATRIN_1 [288]

Answer:

2 and 3

Explanation:

An element belongs to group 4 and period 3.

3 0
2 years ago
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