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Masteriza [31]
3 years ago
14

How many electrons are in the nucleus of an atom with an atomic number of 7?!!

Chemistry
1 answer:
zzz [600]3 years ago
7 0
There are two electrons
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Cience, Life Science
Rudiy27

Answer:

I think the answer is All of these answers are correct.

4 0
2 years ago
Light travels one million times faster than sound. How long would light take to travel from one hill to the other?
leva [86]

Answer:

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Explanation:

7 0
2 years ago
A geochemist in the field takes a 36.0 mL sample of water from a rock pool lined with crystals of a certain mineral compound X.
NeTakaya

Answer:

solubility of X in water at 17.0 ^{0}\textrm{C} is 0.11 g/mL.

Explanation:

Yes, the solubility of X in water at 17.0 ^{0}\textrm{C} can be calculated using the information given.

Let's assume solubility of X in water at 17.0 ^{0}\textrm{C} is y g/mL

The geochemist ultimately got 3.96 g of crystals of X after evaporating the diluted solution made by diluting the 36.0 mL of stock solution.

So, solubility of X in 1 mL of water = y g

Hence, solubility of X in 36.0 mL of water = 36y g

So, 36y = 3.96

   or, y = \frac{3.96}{36} = 0.11

Hence solubility of X in water at 17.0 ^{0}\textrm{C} is 0.11 g/mL.

3 0
3 years ago
the amount of heat involved in the synthesis of 1 mole of a compound from its elements with all substances in their standard sta
otez555 [7]

<span>The </span>standard enthalpy of formation<span> <span>is defined as the change in </span></span>enthalpy<span> <span>when one mole of a substance in the </span></span>standard<span> <span>state (1 atm of pressure and temperature of 298.15 K) is </span></span>formed<span> <span>from its pure elements under the same conditions.</span></span>

4 0
2 years ago
Read 2 more answers
Most chemical reactions involve the evolution or absorption of heat energy. True or False
sergejj [24]

Answer:

True

Explanation:

The majority of the reactions happened with a flow of heat. When there's no heat, the reaction is adiabatic.

For no adiabatic reactions, the heat can be released (evolution) by the system, so the reaction will be exothermic, or absorbed by the system (absorption), then the reaction is called endothermic.

7 0
2 years ago
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