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ehidna [41]
3 years ago
15

Identify the type of scientific knowledge represented by each statement. law theory hypothesis If a certain piece of metal is co

oled, it will conduct electricity better. arrowRight The amount of electric current that passes through a conductor is directly proportional to the voltage and is described by the formula V = IR. arrowRight Electricity is the flow of electric charge in the form of electrons moving through a circuit. arrowRight
Chemistry
2 answers:
Anton [14]3 years ago
8 0
“If a certain metal is cooked, it will conduct electricity better”

- this is a hypothesis, since the statement is kind of vague...”certain metal”...and is written in an “if-then” format.

The amount of electric current that passes through a conductor is directly proportional to the voltage and is described as V = IR

- laws are usually scientific understanding that we’ve tested so much that we’ve come to a conclusion that can often be written out as a mathematical relationship. Hence, the “V = IR”

Electricity is the flow of electric charge in the form of electrons moving through a circuit

- this is a theory. I would give an explanation but I’m out of time.

Hope this helps
Contact [7]3 years ago
7 0

If a certain piece of metal is cooled,  

it will conduct electricity better. its a Hypothesis

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What mass of iron is formed when 10 grams of carbon react with 80 grams of iron iii oxide?
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Answer:

55.85 grams of Fe is formed.

Explanation:

Identify the reaction:

2Fe₂O₃  +  3C  →  4Fe  +  3CO₂

Identify the limiting reactant, previously determine the mol of each reactant

(mass / molar mass)

10 g / 12 g/m = 0.83 moles C

80 g / 159.7 g /m = 0.500 moles Fe₂O₃

2 moles of oxide need 3 moles of C, to react

0.5 moles of oxide, will need ( 0.5  . 3)/ 2 = 0.751 mol

I have 0.83 moles of C, so C is the excess.

The limiting is the oxide.

3 mol of C need 2 mol of oxide to react

0.83 mol of C, will need (0.83  . 2)/ 3 = 0.553 mol of oxide, and I only have 0.5 (That's why Fe₂O₃ is the limiting)

Ratio is 2:4 (double)

If I have 0.5 moles of oxide, I will produce the double, in the reaction.

1 mol of Fe, will be produce so its mass is 55.85 g

5 0
3 years ago
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Answer:

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Calculate the solubility of Mg(OH)2 in water at 25 C. You'll find Ksp data in the ALEKS Data tab. Round your answer to significa
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Answer:

1.12 × 10⁻⁴ M

Explanation:

Step 1: Write the reaction for the solution of Mg(OH)₂

Mg(OH)₂(s) ⇄ Mg²⁺(aq) + 2 OH⁻(aq)

Step 2: Make an ICE chart

We can relate the solubility product constant (Ksp) with the solubility (S) through an ICE chart.

       Mg(OH)₂(s) ⇄ Mg²⁺(aq) + 2 OH⁻(aq)

I                                0                    0

C                              +S                +2S

E                                S                  2S

The solubility product constant is:

Ksp = 5.61 × 10⁻¹² = [Mg²⁺] × [OH⁻]² = S × (2S)² = 4S³

S = 1.12 × 10⁻⁴ M

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3 years ago
How does positive catalyst increase the rate of chemical reaction?​
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Answer:

A catalyst speeds up a chemical reaction, without being consumed by the reaction. It increases the reaction rate by lowering the activation energy for a reaction. ... Remember that with a catalyst, the average kinetic energy of the molecules remains the same but the required energy decreases

Explanation:

...

hope that is helpful

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