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3 years ago

1. What is the angular distance north or south from the earth's equator beginning at

Chemistry

1 answer:

Vlada [557]3 years ago

5 0

Answer:

c. Latitude

Explanation:

The angular distance north or south from the earth's equator beginning at 0° at the equator and ending at 90° of either pole is the latitude.

The equator is a line of latitude that divided the earth into two hemispheres.

Only the equator is a great circle as a line of latitude. Others are small circles.

Weather is the atmospheric condition of a place over a short period of time
Climate is the average weather condition at a place over a long period of time.
Altitude of a place is its elevation above a reference plane.

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How many grams of ethanol, CH3CH2OH, should you dissolve in water to make 0.800 L of vodka (which is an aqueous solution that is

Rashid [163]

Answer:

252.5g

Explanation:

Given parameters:

Volume of vodka = 0.8L

Molarity of ethanol = 6.86M

Unknown:

Mass of ethanol = ?

Solution:

Molarity is one of the ways of expressing concentration. It is the number of moles of a substance in a solution.

Since Vodka = ethanol + water = solution

Molarity = $\frac{number of moles of ethanol}{Volume of solution}$

Number of moles of ethanol = molarity of vodka x volume of solution

Once we obtain the number of moles, we can derive the mass of the ethanol;

Number of moles = 6.86M x 0.8L = 5.49moles

Mass of ethanol = number of moles x molar mass

molar mass of ethanol = 12 + 3(1) + 12 + 2(1) + 16 + 1 = 46g/mol

Mass of ethanol = 5.49 x 46 = 252.5g

3 0

4 years ago

. Determine the standard free energy change, ɔ(G p for the formation of S2−(aq) given that the ɔ(G p for Ag+(aq) and Ag2S(s) are

olga nikolaevna [1]

<u>Answer:</u> The standard free energy change of formation of $S^{2-}(aq.)$ is 92.094 kJ/mol

<u>Explanation:</u>

We are given:

$K_{sp}\text{ of }Ag_2S=8\times 10^{-51}$

Relation between standard Gibbs free energy and equilibrium constant follows:

$\Delta G^o=-RT\ln K$

where,

$\Delta G^o$ = standard Gibbs free energy = ?

R = Gas constant = $8.314J/K mol$

T = temperature = $25^oC=[273+25]K=298K$

K = equilibrium constant or solubility product = $8\times 10^{-51}$

Putting values in above equation, we get:

$\Delta G^o=-(8.314J/K.mol)\times 298K\times \ln (8\times 10^{-51})\\\\\Delta G^o=285793.9J/mol=285.794kJ$

For the given chemical equation:

$Ag_2S(s)\rightleftharpoons 2Ag^+(aq.)+S^{2-}(aq.)$

The equation used to calculate Gibbs free change is of a reaction is:

$\Delta G^o_{rxn}=\sum [n\times \Delta G^o_f_{(product)}]-\sum [n\times \Delta G^o_f_{(reactant)}]$

The equation for the Gibbs free energy change of the above reaction is:

$\Delta G^o_{rxn}=[(2\times \Delta G^o_f_{(Ag^+(aq.))})+(1\times \Delta G^o_f_{(S^{2-}(aq.))})]-[(1\times \Delta G^o_f_{(Ag_2S(s))})]$

We are given:

$\Delta G^o_f_{(Ag_2S(s))}=-39.5kJ/mol\\\Delta G^o_f_{(Ag^+(aq.))}=77.1kJ/mol\\\Delta G^o=285.794kJ$

Putting values in above equation, we get:

$285.794=[(2\times 77.1)+(1\times \Delta G^o_f_{(S^{2-}(aq.))})]-[(1\times (-39.5))]\\\\\Delta G^o_f_{(S^{2-}(aq.))=92.094J/mol$

Hence, the standard free energy change of formation of $S^{2-}(aq.)$ is 92.094 kJ/mol

8 0

3 years ago

_______ are the smallest units of life.

anygoal [31]

Answer:

A.Cells

Explanation:

bugs eggs and bones aren't the smaller than cells.

5 0

3 years ago

Read 2 more answers

Which best describes the oxidizing agent in this reaction?

MissTica

For the reaction Cl₂(aq) + 2 Br⁻(aq) ⇒ 2Cl⁻(aq) + Br₂(aq), Chlorine (Cl) is the oxidizing agent because it gains an electron.

<h3>What is the oxidizing agent?</h3>

In a redox reaction, the oxidizing agent is the one that gains electrons, causing the other element to oxidize.

Let's consider the following redox reaction.

Cl₂(aq) + 2 Br⁻(aq) ⇒ 2Cl⁻(aq) + Br₂(aq)

The corresponding half-reactions are:

Reduction: 2 e- + Cl₂(aq) ⇒ 2Cl⁻(aq)

Oxidation: 2 Br⁻(aq) ⇒ Br₂(aq) + 2 e-

Which best describes the oxidizing agent in this reaction?

Bromine (Br) is the oxidizing agent because it gains an electron. NO. Br is the reducing agent.
Bromine (Br) is the oxidizing agent because it loses an electron. NO. Br is the reducing agent.
Chlorine (Cl) is the oxidizing agent because it gains an electron. YES.
Chlorine (Cl) is the oxidizing agent because it loses an electron. NO. Cl gains electrons.

For the reaction Cl₂(aq) + 2 Br⁻(aq) ⇒ 2Cl⁻(aq) + Br₂(aq), Chlorine (Cl) is the oxidizing agent because it gains an electron.

Learn more about oxidizing agents here: brainly.com/question/9064518

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8 0

2 years ago

How are insects different from arachnids?

aalyn [17]

Arachnids lack antennae. The main differences between insects and arachnids are in their body structure and legs.

<h3>What are insects?</h3>

Both insects and arachnids are multi-legged creatures that tend to elicit fear, and while they have a lot in common, including that fear response, there are some distinct differences between the two.

The main differences between insects and arachnids are in their body structure and legs.

Arachnids have eight legs, whereas insects only have six. Arachnids have simple eyes, whereas insects have compound eyes. Arachnids lack antennae while insects do.

Therefore, Arachnids lack antennae. The main differences between insects and arachnids are in their body structure and legs.

To learn more about insects, refer to the link:

brainly.com/question/28174759

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8 0

1 year ago