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3 years ago

I really need help please someone help me?!. Those are all the questions.

Chemistry

2 answers:

natima [27]3 years ago

4 0

Answer:

question two is most likely you can describe the shape as a twisted ladder, thats what I learned in school.

Explanation:

ch4aika [34]3 years ago

4 0

Sorry I couldn’t help

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Explain how carbon is cycled between the hydrosphere and geosphere. Use specific examples.

nordsb [41]

Carbon is cycled through the hydrosphere and geosphere through biological, chemical, geological, and human activity.
Let's take a forest, for example. These autotrophs take in carbon dioxide (CO2) during photosynthesis. They then release oxygen to the environment and give organisms that perform cellular respiration enough oxygen. Then, the organisms that perform cellular respiration breathe out CO2 that can be used by autotrophs. The consumers can also eat the autotrophs and release CO2 as they breathe out.

When rainwater falls from clouds in the atmosphere, CO2 is dissolved into the drops of rain. The rain (some of it) then goes into oceans and is dissolved into the ocean with the CO2. Then, it comes back from the water and floats up into the atmosphere again.

Rocks at the bottom of the ocean are naturally turned into carbonated rocks, and it releases CO2 through volcanoes. Also, it can convert organic matter into fossil fuels.

Humans take fossil fuels from the Earth and use them as a source of fuel. This naturally releases the carbon dioxide in them, as they are converted into carbon over a very long period of time. Also, humans sometimes burn forests. The fire releases carbon dioxide into the atmosphere.

The same processes that occur geologically and biologically occur in the ocean. Green algae take in CO2 and use it the same way.

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4 years ago

What are three signs that a chemical change has occurred?

galina1969 [7]

Color change. Smell change. Or temperature change. All are signs of chemical reaction

7 0

3 years ago

What is the independent variable? (For science)

DiKsa [7]

Answer:

The independent variable is what you change in the experiment.

Explanation:

The independent determines the dependent variable.

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3 years ago

The molal freezing point constant for copper is 23 °C/m. If pure copper melts at 1083°C, what will be the melting point of a bra

nikitadnepr [17]

Answer: The freezing point of brass is 1028.57°C

Explanation:

We are given:

13.4 mass percent of zinc in brass

This means that 13.4 grams of zinc is present in 100 g of brass

Mass of copper = [100 - 13.4] g = 86.6 g

Depression in freezing point is defined as the difference in the freezing point of pure solution and freezing point of solution.

The equation used to calculate depression in freezing point follows:

$\Delta T_f=\text{Freezing point of pure solution}-\text{Freezing point of solution}$

To calculate the depression in freezing point, we use the equation:

$\Delta T_f=iK_fm$

Or,

$\text{Freezing point of pure solution}-\text{Freezing point of solution}=i\times K_f\times \frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ (in grams)}}$

where,

Freezing point of pure copper = 1083°C

i = Vant hoff factor = 1 (For non-electrolytes)

$K_f$ = molal freezing point elevation constant = 23°C/m

$m_{solute}$ = Given mass of solute (zinc) = 13.4 g

$M_{solute}$ = Molar mass of solute (zinc) = 65.38 g/mol

$W_{solvent}$ = Mass of solvent (copper) = 86.6 g

Putting values in above equation, we get:

$1083-\text{Freezing point of solution}=1\times 23^oC/m\times \frac{13.4\times 1000}{65.38g/mol\times 86.6}\\\\\text{Freezing point of solution}=1028.57^oC$

Hence, the freezing point of brass is 1028.57°C

8 0

3 years ago

Answer the question Pleasee!! 60 points will mark brainliest if right !!

Crank

Answer:

My answer is n=765732mol

4 0

2 years ago