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2 years ago

Please answer this for 15 points

Chemistry

2 answers:

kompoz [17]2 years ago

8 0

The answer for this is 4 valence electrons it is Column IVA

mr_godi [17]2 years ago

3 0

The answer is C!!!!!!!!!!!!!!!!!!!

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Enough water was added to ten grams of sugar

vfiekz [6]

Answer:

25 grams (25g) of sugar

Explanation:

We can set this up algebraically:

10g = 2L

÷ 2 ÷ 2

5g = L

meaning that 5 g are needed to make 1 L

So, if we have 5 L, we will need (5 × 5) 25 grams to produce the same concentration.

6 0

1 year ago

A reaction generates hydrogen gas (H) as a product. The re-

Amiraneli [1.4K]

Answer: The average rate of the reaction is $7.82\times 10^{-3}M/min$

Explanation:

To calculate the molarity of hydrogen gas generated, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Moles of hydrogen gas = $3.91\times 10^{-2}mol$

Volume of solution = 250 mL = 0.250 L (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

$\text{Molarity of }H_2=\frac{3.91\times 10^{-2}mol}{0.250L}=0.1564M$

Average rate of the reaction is defined as the ratio of concentration of hydrogen generated to the time taken.

To calculate the average rate of the reaction, we use the equation:

$\text{Average rate of the reaction}=\frac{\text{Concentration of hydrogen generated}}{\text{Time taken}}$

We are given:

Concentration of hydrogen generated = 0.1564 M

Time taken = 20.0 minutes

Putting values in above equation, we get:

$\text{Average rate of the reaction}=\frac{0.1564M}{20.0min}\\\\\text{Average rate of the reaction}=7.82\times 10^{-3}M/min$

Hence, the average rate of the reaction is $7.82\times 10^{-3}M/min$

6 0

2 years ago

A) explain why caesium is more reactive than potassium.

Kamila [148]

Answer:

Explanation:

(a) Firstly, caesium abd potassium are both in Group 1 of the periodic table. Group 1 metals (also called alkali metals) are the most reactive metals of the periodic table. Caesium is more reactive than Potassium because it has a higher electropositivity than Potassium. Electropositivity is the tendency of a metal to donate electron(s) to form a cation. Electropositivity increases down the group; this is because it is easier for atoms to loose electrons on the outermost shell that are far away from the central nucleus as against atoms whose outermost electrons are closer to the central nucleus. Thus, the more "bulky" an atom is, the farther it's outermost electrons (valence electrons) get from the central nucleus and the easier it is to lose the outermost electron(s). And the easier it is for the valence electron(s) to be removed, the more reactive the atom would be and vice-versa.

Caesium is more reactive than potassium because it is more bulky than potassium, with an atomic number of 55, while potassium has an atomic number of 19.

NOTE: The closer an electron is to the nucleus, the more difficult it is to be removed from it's shell.

(b) i. Formula for Caesium Nitrate:

Symbol for Caesium is Cs and Nitrate is NO₃⁻.

Cs⁺ + NO₃⁻ ↔ CsNO₃

Formula for Caesium Nitrate is CsNO₃

ii. Formula for Caesium sulphate

Symbol for caesium is Cs and Sulphate is SO₄²⁻

Cs⁺ + SO₄²⁻ ↔ Cs₂SO₄

Formula for Caesium sulphate is Cs₂SO₄

NOTE: When writing the formulae, the charges would be exchanged to form the subscript as seen on the product sides above.

7 0

2 years ago

What is the energy of the reaction of aqueous decomposing carbonic acid?

muminat

Answer:

Aqueous carbonic acid (H2CO3) decomposes into a carbon dioxide gas and liquid water. Write a balanced equation for this reaction? | Socratic Aqueous carbonic acid (H2CO3) decomposes into a carbon dioxide gas and liquid water.

Explanation:

6 0

2 years ago

Which of the following would SLOW DOWN the rate of chemical

USPshnik [31]

Answer:

increasing rainfall. hope it help

7 0

2 years ago