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suter [353]
2 years ago
8

Mrs. Harrison mixes some chemicals together in a glass beaker in front of her science class. She asks her students to watch for

a chemical reaction when she holds it over a Bunsen burner. She sets the flame on "low" and holds the beaker a few inches above the heat. After about 30 seconds, the mixture begins to fizz.
What could Mrs. Harrison do to make the chemical change occur faster?
A) add twice as much of a chemical in the mixture
B) increase the flame setting to produce more heat
C) use a smaller beaker with the same amount of chemicals
D) add cold water to the mixture to reduce its temperature
Chemistry
2 answers:
Bumek [7]2 years ago
7 0
The correct answer B. increase the flame setting to produce more heat
Oksana_A [137]2 years ago
7 0

The answer is B. Just had this question.

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Based on table N of the reference tables what is the number of hours required for 42k (potassium -42) to undergo three half-life
skelet666 [1.2K]

The number of hours required : 37.2 hours

<h3>Further explanation</h3>

Given

⁴²K (potassium -42)

Required

The number of hours

Solution

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually, radioactive elements have an unstable atomic nucleus.  

Based on Table N(attached), the half-life for ⁴²K is 12.4 hours, which means half of a sample of ⁴²K will decay in 12.4 hours

For three half-life periods :

\tt 3\times 12.4=37.2~hours

3 0
3 years ago
A low level of carbon dioxide labeled with 14C is accidentally released into the atmosphere surrounding industrial workers as th
ivann1987 [24]

Answer:

D) One half of the carbon atoms of newly synthesized acetyl CoA.

Explanation:

It will be radioactively labeled because Malonyl CoA which contains 3 Carbon molecule is synthesized from Acetyl CoA which has 2 Carbon molecule.

This happens with the addition of ‘CO2’ with the help of the enzyme called acetyl CoA carboxylase.

7 0
3 years ago
Element in the noble ga family are considered stabled because their outer energy levels are
blsea [12.9K]

Answer: In octet state.

Explanation: For noble gases they are stable in state since their outer shell contain fully occupied having 8 electrons.

3 0
3 years ago
Help help help.
Whitepunk [10]
I think B
Hope this helps!
4 0
3 years ago
Find the mass of 175.4mL of benzene if the density is 0.8786g/ml
bulgar [2K]
Hey there!:

Volume = 175.4 mL

density = 0.8786 g/mL  

mass = ?

Therefore:

D = m / V

0.8786 = m / 175.4

m = 0.8786 * 175.4

m = 154.10644 g

hope this helps!


5 0
3 years ago
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