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Mumz [18]
2 years ago
10

Complete the chemical change. _______ + e - → Cl-

Chemistry
2 answers:
Rufina [12.5K]2 years ago
8 0

Answer:

Cl + e-  → Cl-

Explanation:

The electrically neutral chlorine has 17 protons and 17 electrons, 7 of which are in its outer energy level. When an electron is added to a chlorine atom to complete its outer energy level it has more electrons than electrons. Electrons are negative and that is why the charge of chlorine becomes -1

Sedaia [141]2 years ago
3 0
You are left with a chloride ion, so you started off with a chlorine atom.
Cl + e- → Cl-
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The pattern of atoms and molecules give matter it’s ______<br><br> What is the blank?
EastWind [94]

Answer: Try mass that’s the best guess I can give off the top of my head

Explanation: An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms come together which forms molecules. These molecules interact to form solids, gases, or liquids.

8 0
2 years ago
Which of the following isotopes is NOT considered to be a major threat to human health from nuclear fallout? a. strontium-90 b.
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4 0
3 years ago
Which reactions are single displacement reactions? 2NaBr + CaF2 → 2NaF + CaBr2 SnO2 + 2H2 → Sn + 2H2O 4Na + O2 → 2Na2O 2KClO3 →
r-ruslan [8.4K]

Answer : The correct options are, SnO_2+2H_2\rightarrow Sn+2H_2O and 2Al+6HCl\rightarrow 2AlCl_3+3H_2

Explanation :

Single displacement reaction : It is a type of chemical reaction in which the more reactive element displaces the less reactive element.

Option A reaction : 2NaBr+CaF_2\rightarrow 2NaF+CaBr_2

It is an example of double displacement reaction because in this reaction a positive cation and a negative anion of the two reactants exchange their places to form two new products.

Option B reaction : SnO_2+2H_2\rightarrow Sn+2H_2O

It is an example of single displacement reaction.

Option C reaction : 4Na+O_2\rightarrow 2Na_2O

It is an example of combination reaction because in this reaction two reactants react to give a single product.

Option D reaction : 2KClO_3\rightarrow 2KCl+3O_2

It is an example of decomposition reaction because in this reaction a single reactant decomposes into two or more products.

Option E reaction : 2Al+6HCl\rightarrow 2AlCl_3+3H_2

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5 0
3 years ago
if 28.5 g of calcium hydroxide is dissolved in enough water to make 185g of solution what is the percent by mass of calcium hydr
DENIUS [597]

The percent by mass of calcium hydroxide in the solution : 15.41%

<h3>Further explanation</h3>

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

Mass of solute (Ca(OH₂-Calcium hydroxide) : 28.5

Mass of solution = 185 g

\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%\\\\\%mass=\dfrac{28.5~g}{185~g}\times 100\%\\\\\%mass=15.41\%

6 0
3 years ago
According to the law of conservation of matter, the number of_______is not changed by a chemical reaction
nikdorinn [45]

Answer:

Atoms

Explanation:

According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and kind of atoms after the chemical change as were present before the chemical change.

6 0
2 years ago
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