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givi [52]
3 years ago
10

A substance that has high reactivity

Chemistry
1 answer:
Dovator [93]3 years ago
6 0

Answer:

Explanation: A, easily combines chemically with other substances.

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If a solution is saturated, which of these is true?
Fiesta28 [93]
If a solution is saturated, that means it already posses the maximum number of solutes thus have been dissolved in it, and thus the concentration cannot be increased.
8 0
3 years ago
Read 2 more answers
What do you think happens when you add an emulsifier to oil and vinegar?
julsineya [31]
They separate because of different densities.
7 0
3 years ago
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What is the electron shielding effect? What is the trend for it? How and why does it happen?
andriy [413]

Answer:

See explanation

Explanation:

In an atom, the inner electrons may shield the outer electrons from the attractive force of the nucleus. We, refer to this phenomenon as the <u><em>shielding effect</em></u>, It is defined as a decrease in the magnitude of attraction between an electron and the nucleus of an atom having more than one electron shell (energy level).

Shielding effect increases down the group due to addition of more shells but decreases across the period due to the increase in the size of the nuclear charge.

As the magnitude of shielding increases down the group, ionization of electrons becomes easier and the first ionization energies of elements decreases as we move down the group. Since shielding effect decreases across the period, the first ionization energies of elements increases across the period.

6 0
2 years ago
Home work)
s344n2d4d5 [400]

Answer:

1. Magnesium + Oxygen --> Magnesium oxide

2.Iron + Oxygen --> Iron oxide

3.Copper + Oxygen --> Copper oxide

Explanation:

When an Element such as Magnesium or any other Elements are reacted eith Oxygen it forms an Oxide.

If you ever need the symbol equation here it is too :

1. Mg + O --> MgO

2.Fe + O --> FeO

3.Cu + O--> CuO

3 0
3 years ago
Calculate the molarity of a solution<br> made by 1,5kg of K. CO₂ in 850 mL<br> of water.
anastassius [24]

Answer:

17.83M

Explanation:

Given parameters:

Mass of KCO₂ = 1.5kg

Volume of water  = 850mL

Unknown:

Molarity of solution  = ?

Solution:

Molarity is defined as the number of moles per unit volume. It is the number of moles of solute in a given volume of solution.

   Molarity  = \frac{number of moles }{volume}

Number of moles of solute  = \frac{mass of KCO_{2} }{molar mass}

  Molar mass of KCO₂  = 39 + 12 + 3(16) = 99g/mol

  Number of moles  = \frac{1500}{99}   = 15.15moles

   850mL : gives 0.85L

     

Molarity  = \frac{15.15}{0.85}   = 17.83M

8 0
3 years ago
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