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Ronch [10]
4 years ago
14

The elephant toothpaste demonstration was a great example of the use of potassium iodide as "catalyst". Why did Dr. Hartings use

potassium iodide in this demonstration?
To slow down the reaction

To speed up the reaction

To preserve the oxygen in the soap bubbles

To give color to the foam



Ammonia is one of the most produced chemical compounds in the world today. Which of the following is the main real-world use for ammonia? *

2 points

To maintain the level of of nitrogen in the air (78%)

To produce household cleaners

To produce nitric acid

To produce fertilizer for crops
Chemistry
1 answer:
erica [24]4 years ago
3 0

Answer: the correct answer is B

Explanation: Why it is the correct answer is my teacher told me so im helping you

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I need help here. Did I make any mistakes in any of the equations. Can you please check my work? Please only answer if you know
quester [9]

Answer:

yes it is all corect

Explanation:

4 0
3 years ago
Read 2 more answers
If you mix salt sand and sugar with water what will the mixture be a suspension or solution
Basile [38]
If you mix salt sand and sugar with water what will the mixture be a solution because both sugar and salt can be diluted until the saturation point
6 0
3 years ago
All atoms of isotopes of a particular element have the same number of protons, but different numbers of neutrons in their nuclei
katen-ka-za [31]

Answer:

All atoms of isotopes of a particular element have the same number of protons, but different numbers of neutrons in their nuclei.- True

7 0
3 years ago
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How to make 100 ml of 0.001 mM solution with 0.0405mM solution?
alexgriva [62]

Answer:

Measure 2.47 mL of the stock solution (i.e 0.0405 mM) and dilute it to the 100 mL mark with water

Explanation:

To make 100 mL of 0.001 mM solution from 0.0405mM solution, we need to determine the volume of 0.0405mM solution needed. This can be obtained as follow:

Molarity of stock (M₁) = 0.0405 mM

Volume of diluted (V₂) = 100 mL

Molarity of diluted solution (M₂) = 0.001 mM

Volume of stock solution needed (V₁) =?

M₁V₁ = M₂V₂

0.0405 × V₁ = 0.001 × 100

0.0405 × V₁ = 0.1

Divide both side by 0.0405

V₁ = 0.1 / 0.0405

V₁ = 2.47 mL

Therefore, to make 100 mL of 0.001 mM solution from 0.0405mM solution, measure 2.47 mL of the stock solution (i.e 0.0405 mM) and dilute it to the 100 mL mark with water.

3 0
3 years ago
In which of the following substances does sharing of electrons between two atoms occur?
malfutka [58]

Answer:- B- SO_4^-^2

Explanations:- Sharing of electrons takes place between non metals and the bond formed by the sharing of electrons is known as covalent bond. In first choice we only have a zinc metal and so no sharing of electrons  would be possible here.

In third choice we have NaCl. Na is a metal and Cl is a non metal. The property of metals is to transfer its valence electrons to the non metal and the bond formed is known as ionic bond. So, third choice is also not correct.

In choice B we have sulfate ion that has sulfur and oxygen atoms and both of these are non metals. So, sharing of electrons is present here between the S and O atoms and covalent bonds are formed.

So, choice B- SO_4^-^2 is the right answer.


6 0
3 years ago
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