CHEMISTRY HIGH SCHOOL

What is the oxidation number of chlorine in HClO4?

Answers

Answer 1

Answer:

CIO4-=-1

CI=4O=-1

O has a 2- oxidation change so

CI+4(-2)=-1

CI+(-8)=-1

CI=-1+8=7

So the oxidation number of chlorine is 7 in this case

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Name the two sub-atomic particles in the nucleus of an aluminium atom.
Sodium's atomic number is 11. What does this tell you about an atom of sodium?
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The freezing point of bromine is(1) 539°C (3) 7°C(2) –539°C (4) –7°C

Which substance, when dissolved in water, forms a solution that conducts an electric current?(1) C2H5OH (3) C12H22O11
(2) C6H12O6 (4) CH3COOH

Answers

Answer: Option (4) is the correct answer.

Explanation:

Substance which are able to conduct electricity are ionic in nature. This means that only ionic substances can conduct electricity because they dissociate into ions.

Therefore, out of the given options only acetic acid $(CH_(3)COOH)$ is ionic in nature.

$CH_(3)COOH \rightleftharpoons CH_(3)COO^(-) + H^(+)$

Though $CH_(3)COOH$ is a weak acid but it does dissociate into ions and hence, it forms a solution that conducts an electric current.

When metals form ions, they tend to do so by what

Answers

Losing electrons and forming positive ions

Metals need to give away atoms. Therefore, they tend to give away atoms and become positively charged ions. They're called 'cations' when they become positive.

Sawing a board in half is an example of a chemical change

Answers

Sawing a board in half is a physical change not a chemical change the board doesnt change wood or whatever material it is is still would still be wood
If it were burned it would be a chemical change but its properties stay the same atomically so thats why its not a chemical change.

Current flowing in a circuit depends on two variables identify these variables and their relationship to current

Answers

as the electrons are pushed more by the battery, they move faster through the circuit

Final answer:

The current in a circuit is governed by voltage and resistance, as dictated by Ohm's Law. The voltage-current relationship can be linear in ohmic materials or nonlinear in non-ohmic materials.

Explanation:

The current flowing in a circuit depends primarily on two variables: voltage and resistance. This relationship is defined through Ohm's Law, which states that the current (I) in a circuit is equal to the voltage (V) divided by the resistance (R), or I=V/R.

When the voltage increases while the resistance remains constant, the current will increase. Conversely, when the resistance increases while the voltage remains constant, the current will decrease. Thus, for example, if the resistance doubles, the current is cut in half.

However, it is important to note that not all materials follow this linear relationship. Some materials, known as ohmic materials, follow Ohm's Law, while others, known as non-ohmic materials, exhibit a nonlinear voltage-current relationship.

Learn more about Ohm's Law here:

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. A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of CaCl2 in this solution is __________ molar. a. 0.564
b. 0.571
c. 0.569
d. 0.537
e. 0.214

Answers

Answer:

The concentration of CaCl2 in this solution is 0.564 molar (option A)

Explanation:

Step 1: Data given

Mass of CaCl2 = 23.7 grams

Mass of water = 375 grams

Density of solution is 1.05 g/mL

Step 2: Calculate total mass

Total mass = mass of CaCl2 + mass of water

Total mass = 23.7 grams + 375 grams = 398.7 grams

Step 3: Calculate volume of the solution

Density = mass / volume

Volume = mass / density

Volume = 398.7 grams / 1.05 g/mL

Volume = 379.7 mL = 0.3797 L

Step 4: Calculate moles CaCl2

Moles CaCl2 = mass CaCl2 / molar mass CaCl2

Moles CaCl2 = 23.7 grams / 110.98 g/mol

Moles CaCl2 = 0.214 moles

Step 5: Calculate concentration

Concentration of CaCl2 = moles / volume

Concentration of CaCl2 = 0.214 moles / 0.3797 L

Concentration of CaCl2 = 0.564 mol / L = 0.564 molar

The concentration of CaCl2 in this solution is 0.564 molar (option A)

Which contains more molecules: 1.00 mol H2O2, 1.00 mol C2H6, or 1.00 mol CO?

Answers

I believe H2O2 has the most, because it also has the most atoms (34)
Hope that helps!!

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