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4 years ago

In the ground state, an atom of which element has two valence electrons?

2 answers:

6 0

I am unsure if your teacher has taught you this, but, on a periodic table (of which you can find photos of on google) the numbers above each group how many valence electrons the atom has :) at 10 it restarts at 1<span />

Akimi4 [234]4 years ago

5 0

I would say Ni so yeah thats ur answer

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mickey reacts magnesium with 1.0 M of hydrochloric acid. the reaction tales 2 minutes and 34 seconds to complete. what are 2 way

lutik1710 [3]

Answer:

Explanation:

To slow down this reaction, we can use any of the methods listed below:

Increase the size of the magnesium by using solid lumps of the metal. This will take a much faster time to react than powered and granulated magnesium.
Reduce the concentration of the acid.
Let the reaction take place at a much lower temperature than that given.

These conditions will slow down a chemical reaction.

7 0

3 years ago

Use the virtual lab to prepare 150.0 ml of an iodine solution with a concentration of 0.06 g/ ml from the bottle of 0.12g/ml iod

son4ous [18]

Answer:

Explanation:

In 150 ml of .06 g / ml solution , gram of iodine = 150 x .06 g = 9 g

Let volume of given concentration of .12 g / ml required be V

In volume V , gram of iodine = V x .12 g

According to question

V x .12 = 9 g

V = 9 / .12 = 75 ml

So, 75 ml of .12 g/ml will be taken and it is diluted to the volume of 150 ml to get the solution of required concentration .

8 0

4 years ago

You need to produce a buffer solution that has a pH of 5.26. You already have a solution that contains 10. mmol (millimoles) of

Andreas93 [3]

The question is incomplete, complete question is :

You need to produce a buffer solution that has a pH of 5.50. You already have a solution that contains 10 mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The pka of acetic acid is 4.74.

Answer:

33.11 millimoles of acetate we will need to add to this solution.

Explanation:

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

$pH=pK_a+\log(\frac{[salt]}{[acid]})$

Where :

tex]pK_a[/tex] = negative logarithm of acid dissociation constant of acid

[salt] = Concentration of salt

[Acid] = Concentration of salt

We have:

pH = 5.26

$pK_a=4.74$

[salt] = $[CH_3COO^-]$ = ?

[acid] = $[CH_3COOH]=10.0 mmol$

$5.26=4.74+\log(\frac{[CH_3COO^-]}{[10.0 mmol]})$

$[CH_3COO^-]=33.11 mmol$

33.11 millimoles of acetate we will need to add to this solution.

3 0

4 years ago

Of the following reactions, which is a fission reaction?

trapecia [35]

Answer:

it's c

Explanation:

6 0

4 years ago

Which of the following are 'natural polymers

aliya0001 [1]

Mark Brainliest please

Answer

Proteins

Cellulose
And Silk

Explaination

There are two types of polymers: synthetic and natural.

Synthetic polymers are derived from petroleum oil and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethene, polyester, Teflon, and epoxy.

Polyvinyl chloride, commonly abbreviated PVC, is the third-most widely produced synthetic plastic polymer.

Natural polymers occur in nature and can be extracted. Examples of naturally occurring polymers are silk, wool, DNA, cellulose and proteins and rubber.

7 0

3 years ago