CHEMISTRY COLLEGE

Which statements about freshwater sources are true? Check all that apply.Only about 3 percent of Earth's water is fresh water.
Most of the fresh water on Earth is groundwater.
About 75 percent of the fresh water on Earth is frozen in ice sheets.
The largest source of usable fresh water is groundwater.
More fresh water is in the atmosphere than in rivers and lakes.

Answers

Answer 1

Answer:

Answer: A., C., and D.

Explanation: On Edge!!

Answer 2

Answer:

I will keep all the true statements bold, so you can understand that those are true.

Answer:

Only about 3 percent of Earth's water is fresh water.

Most of the fresh water on Earth is groundwater.

About 75 percent of the fresh water on Earth is frozen in ice sheets.

The largest source of usable fresh water is groundwater.

More fresh water is in the atmosphere than in rivers and lakes.

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In chemical reactions, what does the law of conservation of mass mean?Group of answer choicesMatter is not created nor destroyed.The total mass of the products is greater than the total mass of the reactants.The total mass of the reactants is less that the total mass of the products.Matter is not changed.

What is the mass of silver chlorate (191.32 g/mol) that decomposes to release 0.466L of oxygen gas at STP? AgC1036) _AgCl). _026) A) 1.33g B) 597 E) 7.968 C) 3.988 D) 2658

Answers

Answer : The mass of silver chlorate will be 2.654 grams.

Explanation :

The balanced chemical reaction is,

$2AgClO_3\rightarrow 2AgCl+3O_2$

First we have to calculate the moles of oxygen gas at STP.

As, 22.4 L volume of oxygen gas present in 1 mole of oxygen gas

So, 0.466 L volume of oxygen gas present in $(0.466)/(22.4)=0.0208$ mole of oxygen gas

Now we have to calculate the moles of silver chlorate.

From the balanced chemical reaction, we conclude that

As, 3 moles of oxygen produced from 2 moles of silver chlorate

So, 0.0208 moles of oxygen produced from $(2)/(3)* 0.0208=0.01387$ moles of silver chlorate

Now we have to calculate the mass of silver chlorate.

$\text{Mass of }AgClO_3=\text{Moles of }AgClO_3* \text{Molar mass of }AgClO_3$

Molar mass of silver chlorate = 191.32 g/mole

$\text{Mass of }AgClO_3=0.01387mole* 191.32g/mole=2.654g$

Therefore, the mass of silver chlorate will be 2.654 grams.

Iron has density of 7.9g/cm3. What is the mass of a cube with the length of one side equal to 1.64x10squared cm3?

Answers

Given data:

Density of iron (Fe) = 7.9 g/cm3

Length of one side of the iron cube = 1.64 * 10^2 cm

Now, the volume (V) of a cube in which the length of the side is 'a' cm is given as:

V = a^3

Volume of iron cube = (1.64 *10^2 cm)^3 = 4.41 * 10^6 cm3

The density (D) of an object of mass (m) and volume (V) is given as:

D = m/V

or, m = D*V

Therefore, mass of iron cube = 7.9 g/cm3 * 4.41 * 10^6 cm3

= 34.84 *10^6 g

What product would you expect from a nucleophilic substitution reaction of (S)-2-bromohexane with acetate ion, CH3CO22? Assume that inversion of configuration occurs, and show the stereochemistry of both the reactant and product.

Answers

Answer:

(R) - hexyl acetate

Explanation:

Hello,

This reacción is a nucleophilic substitution SN2.

The configuration (s), means that the groups around the chiral carbon are organized appose to the clock hands movement. But when the reaction happens, these configurations become an (r) configuration, it means the groups around the chiral carbon organize according to the clock hands movement.

Generally, these reactions are related to nucleophilic species, an example is the ion acetate, a conjugated acid which is a weak nucleophilic, for this reason, the transition state is more energetic, it means, less stable than if the reaction occurs with a strong nucleophilic.

Look the image to compare the two configurations of the reactant and product.

What is the net ionic equation for the reaction that occurs when aqueous solutions of naoh and hno3 are mixed?

Answers

Answer:-

H+ + OH- --> H2O

Explanation:-

The chemical equation is NaOH + HNO3 --> NaNO3 + H2O

Now for the ionic compounds

HNO3 --> H+ + NO3 -

NaOH--> Na+ + OH-

NaNO3 --> Na+ + NO3-

Water being covalent will remain as H2O,

Hence

HNO3 + NaOH--> NaNO3 + H2O

H+ + NO3 - + Na+ + OH- --> Na+ + No3 - + H2O.

Crossing out common terms

H+ + OH- --> H2O

Vanadium exhibits a variety of oxidation states. what is the oxidation state of vanadium in vpo3?

Answers

Oxidation state is V(III)

2. Calculate the mass of solvent in grams in a solution containing 3.0 grams of Tylenolif the mass percent is 3.5%.

Answers

Answer:

83g

Explanation:

1, Formula

Mass percent = (mass of solute/mass of solution) × 100

2. Determine mass of solution

Substitute the data and clear the mass of solution:

3.5 = (3.0g / mass of solution) × 100

0.035 = 3.0g / mass of solution

mass of solution = 3.0 g / 0.035

mass of solution = 85.714g

3. Determine the mass of solvent:

mass of solvent = mass of solution - mass of solute

mass of solvent = 85.714g - 3.0g = 82.714g

Round to two significant figures: 83 g

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