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nalin [4]
2 years ago
8

. The element with the following

Chemistry
1 answer:
Ksenya-84 [330]2 years ago
7 0

Explanation:

(a) Chlorine the first row Is 1s the second is 2s followed by 2p...etc as Chlorine has 17 electrons

You might be interested in
A piece of iron is heated to 120'C then placed in a calorimeter containing 50g of water. The water temperature is raised from 30
Lana71 [14]

Answer:

Mass of iron = 59.375 gm

Explanation:

Calories ( or joules) are added to the water by the hot steel so at the endpoint they are BOTH at 40 C

 The water gains:

     4.18  j/g-C  * 50 * (40-30 C) = 2090 j

The steel gave up 2090 j going from 120 to 40 C

2090 = .44 j/g-C  * m * (120-40)    solve fro m = 59.375 gm

3 0
2 years ago
4. Identify each substance in the following word equation as a reactant or a product
dolphi86 [110]

Explanation:

4.                 limestone heat lime + carbon dioxide

The reactants in this expression above is limestone

The products of the reaction is carbon dioxide and lime

Reactant is the species that gives the product and it is usually found on the left hand side of the expression.

The product is the substance on the right hand side of the expression that forms through the experiment.

Heat is used to facilitate the reaction.

5. An exothermic reaction is a reaction in which heat is given off.

An endothermic reaction is a reaction in which heat is absorbed in the process.

An exothermic reaction is always warmer after the reaction whereas an endothermic reaction is colder at the end of the reaction.

6.  Sodium salicylate is made from carbon dioxide and sodium phenoxide.

The reactants are:

                  Carbon dioxide and sodium phenoxide

The product is:

         Sodium salicylate

8 0
3 years ago
Which expressions are equal to 675? 700 – 25 O 700 – 75 O 600 + 75 O 634 + 31 500 275​
ser-zykov [4K]

Answer:

30

Explanation:

6 0
2 years ago
Read 2 more answers
What is the half-life of A? What will the pressure, initially 32.1 kPa, at
kodGreya [7K]

Answer:

a) 32.09 kPa

b) 32.09 kPa

Explanation:

Given data:

rate constant = 3.56\times 10^{-7} s^{-1}

initial pressure is = 32.1 kPa

half life of A is calculated as

t_{1/2} = \frac{ln 2}{k}

t_{1/2} = \frac{ln 2}{3.56\time 10^{-7}}

t_{1/2} = = 1.956 \times 10^6 s

for calculating pressure we have follwing expression

ln p = ln P_o - kt

P =P_o e^{-kt}

a) P = 32.1 e^{-3.56\times 10^{-7} \times 10} = 32.09 kPa

b) P = 32.1 e^{-3.56\times 10^{-7} \times 10\times 60} = 32.09 kPa

5 0
3 years ago
Is it possible for an electron in a hydrogen atom to emit a gamma ray by falling to a lower energylevel?
jeka94
No, its not possible. Let's go back to 4th grades' basic science.
"Energy can not be created or destroyed."
This applies to everything, even atoms!

Have a great day! ❤
7 0
3 years ago
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