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3 years ago

Help please ! ASAP neeeeeed and answerrrrrr

Chemistry

2 answers:

ivann1987 [24]3 years ago

7 0

Answer:

A. Heater will only become warm when switch is closed.

Explanation:

Switches are used to control the flow of electrons (basically electricity). If you look at the other trials, you see that when switch is open, the bulb or fan does not run cuz no electricity can get to them. But when switch is closed, electricity gets to them. Thus, they will experience similar thing with the heater I assume cuz they have not said anything about battery voltage or anything preventing heater from heating.

Luden [163]3 years ago

6 0

Answer:

The answer is D

Explanation:

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Automotive antifreeze consists of ethylene glycol, CH2(OH)CH2(OH), a nonvolatile nonelectrolyte. Calculate the boiling point and

spayn [35]

Answer:

Freezing point of solution = - 10.3°C

Boiling point of solution = 102.8°C

Explanation:

This is about colligative properties:

Freezing point depression → ΔT = Kf . m

ΔT = Freezing point of pure solvent - Freezing point of solution

Boiling point elevation → ΔT = Kb . m

ΔT = Boiling point of solution - Boiling point of pure solvent

Let's determine m which means molality (moles of solute in 1 kg of solvent)

Solute: Ethylene glycol → Mass = 25 g

Moles = Mass / Molar mass → 25 g / 60g/mol = 0.416 moles

Solvent: Water

25 % means, 25 g of solute in 100 g of solution

Therefore, the mass of water is 75 g (100 -25) . (Solution = Solute + Solvent)

We convert the mass from g to kg → 75 g . 1kg /1000g = 0.075 kg

Molality (mol/kg) = 0.416 m / 0.075kg = 5.55 m

We replace data in the formulas:

<u>Freezing point depression</u>:0° - Freezing point of solution= 1.86°C/m. 5.55 m

Freezing point of solution = - (1.86°C/m . 5.55m) = - 10.3°C

<u>Boiling point elevation</u>:Boiling point of solution - 100°C = 0.51°C /m . 5.55 m

Boiling point of solution = 0.51°C /m . 5.55 m + 100°C = 102.8°C

3 0

3 years ago

Which energy carries are formed by light dependent reaction

ad-work [718]

Answer: "In the light-dependent reactions, energy absorbed by sunlight is stored by two types of energy-carrier molecules: ATP and NADPH. The energy that these molecules carry is stored in a bond that holds a single atom to the molecule. For ATP, it is a phosphate atom, and for NADPH, it is a hydrogen atom."

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3 years ago

Running water can transport weathered pieces of rocks downstream what will happen to these weathered pieces of rocks and sedimen

OleMash [197]

Answer:

those small sediments begin to precipitate, condense on the ground and finally settle.

Explanation:

Sedimentation is a natural process, which occurs spontaneously in nature and promotes the formation of sedimentary rocks.

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3 years ago

A physical change occur when a

Viefleur [7K]

The answer is C. Glue gun melts a glue stick.

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4 years ago

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Water has a higher specific heat index than other common materials, so it takes a lot of energy to raise the temperature of wate

Maurinko [17]

Answer: Areas surrounded by water would have less of a change in temperature

throughout the year.

Explanation: Water has a higher specific heat index so it's temperature will be slow to rise. Water also holds heat longer than most material hence areas sorrounsing water will have less temperature change throughout the year.

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4 years ago