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3 years ago

What type of change,physical or chemical. Take place in each of the following water vapor condence to form rain

Chemistry

1 answer:

Paul [167]3 years ago

5 0

Explanation:

I think the answer is Chemical change

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Fluoride ion is poisonous in relatively low amounts: 0.2 g of F- per 70 kg of body weight can cause death. Nevertheless, in orde

svetoff [14.1K]

Answer:

$\boxed{\text{(a) 14 L; (b) 711 kg}}$

Explanation:

(a) Litres of water

$\text{Mass of F}^{-} = 8.5 \times 10^{7}\text{ gal} \times \dfrac{\text{0.2 mg F}^{-}}{\text{1 kg}} = \textbf{14 mg F}^{-}\\\\\text{Volume of water} = \text{14 mg F}^{-} \times \dfrac{\text{1 L water}}{\text{1 mg F}^{-}} = \textbf{14 L water}\\\\\text{The person would have to consume $\boxed{\textbf{14 L}}$ of water per day}$

(b) Mass of NaF

$\text{Volume} =8.5 \times 10^{7} \text{gal} \times \dfrac{\text{3.785 L}}{\text{1 gal}} = 3.22 \times 10^{8}\text{ L}\\\\\text{Milligrams of F}^{-} = 3.22 \times 10^{8}\text{ L} \times \dfrac{\text{ 1 mg F}^{-}}{\text{1 L}} = 3.22 \times 10^{8}\text{ mg F}^{-}\\\\\text{kilograms of F}^{-} = 3.22 \times 10^{8}\text{ mg F}^{-} \times \dfrac{\text{1 mg F}^{-}}{10^{6}\text{kg F⁻}} = \text{322 kg F}^{-}$

1 kmol of NaF (41.99 kg) contains 19.00 kg of F⁻.

$\text{Kilograms of NaF}= \text{322 kg F}^{-} \times \dfrac{\text{41.99 kg NaF}}{\text{19.00 kg F}^{-}} = \text{711 kg NaF}\\\\\text{It will take } \boxed{\textbf{711 kg}} \text{ of NaF to treat the reservoir}$

7 0

3 years ago

Read 2 more answers

The tendency of an object to resist a change in its motion is called ________. Question 5 options:

RUDIKE [14]

A) inertia is the answer

5 0

3 years ago

In ______ observation, EVERY INDIVIDUAL in a population is counted. In _________ observation, SIGNS OF AN INDIVIDUAL, such as tr

larisa86 [58]

Answer:

In direct observation, EVERY INDIVIDUAL in a population is counted. In indirect observation, SIGNS OF AN INDIVIDUAL, such as tracks or nests, are counted.

Explanation:

Direct observation is to involve looking at the actual behavior or occurrence so for your question it would be every individual.

Indirect observation is a result of that occurrence, so for your question it would be the signs of an individual.

8 0

4 years ago

If 1.45 moles of Sodium Bromide are added to a 7.5 M solution, what is the volume of the solution made?

timurjin [86]

Answer:

0.193 L

Explanation:

Another way of writing the question would be: What volume of a 7.5 M Sodium Bromide solution would contain 1.45 moles.

To answer that we can use the definition of molarity:

Molarity = moles / liters

We input the given data:

7.5 M = 1.45 moles / liters

And calculate how many liters are required:

1.45 mol / 7.5 M = 0.193 L

3 0

3 years ago

3) Two atoms have identical electron configurations. Which statement about the atoms

mel-nik [20]

I’m sure it’s C hope it helps!!

6 0

3 years ago