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3 years ago

The two classifications of all chemicals are organic and salts. a. True b. False

Chemistry

2 answers:

Katarina [22]3 years ago

8 0

Answer:

False I took the test

Explanation:

zhenek [66]3 years ago

7 0

Chemicals are never classified all depends upon it's physical and chemical properties so the answer is FALSE

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What is the correct term for blocked sunlight and reduced solar radiation as a result of a volcanic eruption?

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I'm pretty sure it's called a volcanic winter, look up my answer to be correct though.

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3 years ago

Which of the following elements has the highest atomic radius, Sr or Cu

cestrela7 [59]

Answer:

Sr or Strontium

Explanation:

sr: strontium has atomic radius of 255pm

cu: copper has an atomic radius of 128pm

they teach you in chem how to do it based off the chart but I don't remember that method

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2 years ago

Which of the following is NOT a cause of Earth's internal heat?

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Answer:

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3 years ago

Wastewater discharged into a stream by a sugar refinery contains 3.40 g of sucrose (C12H22O11) per liter. A government-industry

Ipatiy [6.2K]

Answer: The pressure that must be applied to the apparatus is 0.239 atm

Explanation:

To calculate the osmotic pressure, we use the equation for osmotic pressure, which is:

$\pi=iMRT$

or,

$\pi=i\times \frac{m_{solute}}{M_{solute}\times V_{solution}\text{ (in L)}}}\times RT$

where,

$\pi$ = osmotic pressure of the solution

i = Van't hoff factor = 1 (for non-electrolytes)

$m_{solute}$ = mass of sucrose = 3.40 g

$M_{solute}$ = molar mass of sucrose = 342.3 g/mol

$V_{solution}$ = Volume of solution = 1 L

R = Gas constant = $0.0821\text{ L atm }mol^{-1}K^{-1}$

T = temperature of the solution = $20^oC=[20+273]K=293K$

Putting values in above equation, we get:

$\pi =1\times \frac{3.40g}{342.3g/mol\times 1}\times 0.0821\text{ L. atm }mol^{-1}K^{-1}\times 293K\\\\\pi =0.239atm$

Hence, the pressure that must be applied to the apparatus is 0.239 atm

3 0

3 years ago

Part D

Basile [38]

The heat lost by copper(ii) sulfate is equal to heat absorbed by water since the total energy in the system remains constant according to the law of conservation of energy.

<h3>How can the number of moles be determined?</h3>

The number of moles of a substance is determined using the formula below:

Number of moles = mass/molar mass

Assuming the mass of copper(ii) sulfate used is Mc, number of moles of copper(ii) sulfate used is:

Moles of copper(ii) sulfate = Mc/159.60 moles

The heat absorbed by water is calculated using the formula below:

Quantity of Heat, H = mass × specific heat capacity × temperature change

mass of water =  10 g

Let temperature change be Tc

Heat absorbed by water = 10 × 4.186 × Tc = 41

86Tc

The change in internal energy, ΔU of copper(ii) sulfate, is given as:

ΔU = Q − W

where:

Q = heat absorbed by water

W = work done by or on the system

The enthalpy of the reaction is given as:

ΔH= energy released or absorbed/moles of copper (ii) sulfate

Therefore, according to the law of conservation of energy, the total energy in the system remains constant.

Learn more about internal energy change at: brainly.com/question/14126477

5 0

2 years ago