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3 years ago

How would you expect energy to change during a chemical reaction?

1 answer:

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B. The energy will be converted into another form. In chemical reactions energy is usually changed to heat or light energy. This is an example of the First Law of Thermodynamics which states that energy can not be created or destroyed.

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How does scarcity impact society

g100num [7]

Answer:

a market/society is dictated by supply and demand and scarify affects the supply of a product because if something is more scarce/rare then usually there is a higher demand and a higher price. This impacts society because it affects the price of things and how much people are willing to give for it

Explanation:

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2 years ago

Read 2 more answers

Consider the following equilibrium: CO2(g) + C(graphite) 2CO(g); ΔH = 172.5 kJ The equilibrium constant for this reaction will

bezimeni [28]

Answer: Option (B) is the correct answer.

Explanation:

As the given reaction is as follows.

$CO_{2}(g) + C(graphite) \rightarrow 2CO(g)$

Equilibrium constant for this reaction will be as follows.

$K_{c} = \frac{[CO_{2}]}{[CO]^{2}}$

According to Le Chatelier's principle, when we increase the temperature then the equilibrium will shift towards the right hand side.

As a result, concentration of carbon dioxide will decrease whereas concentration of carbon monoxide will increase.

Thus, we can conclude that in the given reaction equilibrium constant for this reaction will decrease with increasing temperature.

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3 years ago

You are given a 1.55 g mixture of calcium nitrate and calcium chloride. You dissolve this mixture in 20 mL of water and add an e

irina [24]

Answer:

13.4 (w/w)% of CaCl₂ in the mixture

Explanation:

All the Cl⁻ that comes from CaCl₂ (Calcium chloride) will be precipitate in presence of AgNO₃ as AgCl.

To solve this problem we must find the moles of AgCl = Moles of Cl⁻. As 2 moles of Cl⁻ are in 1 mole of CaCl₂ we can find the moles of CaCl₂ and its mass in order to find mass percent of calcium chloride in the original mixture.

Moles AgCl - Molar mass: 143.32g/mol -:

0.535g * (1mol / 143.32g) = 3.733x10⁻³ moles AgCl = Moles Cl⁻

Moles CaCl₂:

3.733x10⁻³ moles Cl⁻ * (1mol CaCl₂ / 2mol Cl⁻) = 1.866x10⁻³ moles CaCl₂

Mass CaCl₂ -Molar mass: 110.98g/mol-:

1.866x10⁻³ moles CaCl₂ * (110.98g/mol) = 0.207g of CaCl₂ in the mixture

That means mass percent of CaCl₂ is:

0.207g CaCl₂ / 1.55g * 100 =

<h3>13.4 (w/w)% of CaCl₂ in the mixture</h3>

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3 years ago

1) Students set up the apparatus you see here to separate water into its two components: hydrogen and oxygen. The illustration a

zvonat [6]

Answer:

1) D; 2) B

Explanation:

1) Conservation of atoms

D is correct.

It has four atoms of H and two of O on each side of the reaction arrow.

A. Wrong. It has the same number of H and O on each side, but it has the wrong product. The reaction forms O₂ molecules, not O atoms.

B. Wrong. Atoms are balanced, but the products are incorrect.

C. Wrong. Atoms are balanced, but the reactants are incorrect.

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2) Chemical equations

B is correct.

The atoms are balanced, and the equation shows the correct formulas of the molecules.

A. Wrong. Atoms are balanced, and the formulas are correct, but the equation is not in its simplest form. The coefficients are not in their lowest terms. We must divide every coefficient by six to get the correct equation: H₂ + Cl₂ ⟶ 2HCl.

C. Wrong. The reactants are incorrect, and the equation is not in its lowest terms.

D. Wrong. The reactants are incorrect.

8 0

3 years ago

Why might an idea or hypothesis be discarded?

miv72 [106K]

Answer:

Because That is the right choice

7 0

3 years ago