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Degger [83]
3 years ago
12

An aqueous solution of sodium

Chemistry
2 answers:
DochEvi [55]3 years ago
8 0

Answer:

2.5×10^-7mol/dm^3

Explanation:

Firstly convert the cm^3 to dm^3

200×1000=200000dm^3

Calculate the g/dm^3

2/200000=0.00001g/dm^3

To calculate mol/dm^3

Mol/dm^3=mass given\molar mass

=0.00001/40

=2.5×10^-7mol/dm^3

KATRIN_1 [288]3 years ago
6 0

Answer:

0.25mol/dm^3

Explanation:

Let us calculate the number of mole in 2g of NaOH. This is illustrated below:

Molar Mass of NaOH = 23 + 16 + 1 = 40g/mol

Mass of NaOH given = 2g

Number of mole = Mass /Molar Mass

Number of mole of NaOH = 2/40 = 0.05mole

Volume = 200cm^3

1000cm^3 = 1dm^3

200cm^3 = 200/1000 = 0.2dm^3

Molarity = mole/Volume

Molarity = 0.05/0.2

Molarity = 0.25mol/dm^3

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Answer:

The answer to your question is:

Explanation:

Ionic compound is formed when a metal and a nonmetal are attached.

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From the list the nonmetals with a valence of -1 are:

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I need help FAST ASAP
kiruha [24]
In this item, we are simply to find the ions that may bond and are able to form a formula unit. We are also instructed to give out their name. There are numerous possible combinations of ions to form a compound. Some answers are given in the list below.

1.  Na⁺     ,    Cl⁻    , NaCl   ---> sodium chloride (this is most commonly known as table salt)

2. C⁴⁺       , O²⁻     , CO₂  ---> carbon dioxide

3. Al³+     , Cl⁻       , AlCl₃   ----> aluminum chloride

4. Ca²⁺     , Cl⁻     , CaCl₂    ---> calcium chloride

5. Li⁺        , Br⁻      , LiBr       ---> lithium bromide

6. Mg³⁺     , O²⁻      , Mg₂O₃   ----> magnesium oxide

7. K⁺        , I⁻          , KI   ---> potassium iodide

8. H⁺        , Cl⁻        , HCl  --> hydrogen chloride

9. H⁺        , Br⁻         , HBr ----> hydrogen bromide

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6 0
4 years ago
A proton is fired toward a lead nucleus from very far away. How much initial kinetic energy does the proton need to reach a turn
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Answer:

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Since

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We have,

Kf = 0

Ui = 0.

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6 0
4 years ago
Answer the questions below:
iren2701 [21]

Answer:

1.  An apple is something that has matter.

2. Light does not have matter. It neither has mass or takes up and space.

3. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

4. A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!

5. A precipitate is a solid that forms out of solution.

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Explanation:

Matter is anything that has mass and takes up volume.

7 0
3 years ago
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