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4 years ago

11

Assessment timer and count Assessment items Item 3 What condition would most likely cause a decrease in the salinity of ocean wa

ter? freezing of glaciers extremely hot weather high rates of evaporation a river flowing into the sea

1 answer:

Goryan [66]4 years ago

3 0

Answer:

it's a river flowing into the sea

Explanation:

i had it on a quiz for k12 on god it's the good one have a good day

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An inflated balloon contains X air molecules.After some time the volume of the balloon is found to be the half at the same tempe

astra-53 [7]

<u>Answer:</u>

(a): The balloon will contain $\frac{X}{2}$ number of molecules now.

(b): The gas law associated with this is Avogadro's law.

<u>Explanation:</u>

Avogadro's law states that the volume of the gas is directly proportional to the number of moles of the gas at constant pressure and temperature

Mathematically,

$V\propto n$ (At constant pressure and temperature)

OR

$\frac{V_1}{n_1}=\frac{V_2}{n_2}$ .....(1)

where,

$V_1\text{ and }n_1$ = Initial volume and number of moles

$V_2\text{ and }n_2$ = Final volume and number of moles

We are given:

$V_2=\frac{V_1}{2}$

Putting values in equation 1, we get:

$\frac{V_1}{n_1}=\frac{V_1}{2\times n_2}\\\\n_2=\frac{n_1}{2}$

(a):

If $n_1$ number of moles of gas contains X number of molecules

So, $\frac{n_1}{2}$ number of moles of gas will contain = $\frac{X}{n_1}\times {n_1}{2}=\frac{X}{2}$ number of molecules

Hence, the balloon will contain $\frac{X}{2}$ number of molecules now.

(b): The law used is Avogadro's law.

8 0

3 years ago

A gas sample occupies 8.77 L at 20 degrees Celsius and 3.98 atm. What is

Softa [21]

Answer:

1.45 mol

Explanation:

Given data

Volume of the gas (V): 8.77 L

Temperature of the gas (T): 20 °C

Pressure of the gas (P): 3.98 atm

Step 1: Calculate the absolute temperature (Kelvin)

We will use the following expression.

$K = \°C + 273.15\\K = 20\°C + 273.15 = 293K$

Step 2: Calculate the number of moles (n) of the gaseous sample

We will use the ideal gas equation.

$P \times V = n \times R \times T\\n = \frac{P \times V}{R \times T} = \frac{3.98atm \times 8.77L}{\frac{0.0821atm.L}{mol.K} \times 293K} = 1.45 mol$

3 0

3 years ago

The _____ agent is the substance in a redox reaction that accepts electrons.

777dan777 [17]

B. oxidizing

In the reaction the oxidizing agent is reduced.

8 0

3 years ago

Read 2 more answers

neonofarm [45]

Answer:

The answer to your question is 0.10 M

Explanation:

Data

Molarity = ?

mass of Sucrose = 125 g

volume = 3.5 l

Formula

Molarity = moles / volume

Process

1.- Calculate the molar mass of sucrose

C₁₂H₂₂O₁₁ = (12 x 12) + (1 x 22) + (16 x 11)

= 144 + 22 + 176

= 342 g

2.- Convert the mass of sucrose to moles

342 g of sucrose ------------------- 1 mol

125 g of sucrose -------------------- x

x = (125 x 1) / 342

x = 0.365 moles

3.- Calculate the molarity

Molarity = 0.365 / 3.5

4.- Result

Molarity = 0.10

5 0

3 years ago

Melting water is an example of a physical change because the atoms are pulled apart to form a new substance. bonds are broken an

kompoz [17]

The appropriate answer is 'the identity of the substance does not change'. Melting water is a phase change from solid to liquid. the melting occurs because the solid ice has absorbed energy or heat energy which breaks down the crystal structure of the ice so that the particles of water are free to flow around. the chemical formula of the substance does not change. <span />

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4 years ago

Read 2 more answers