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3 years ago

3. Describe the process behind how students recover an individual's remains from a surface grave.

Chemistry

1 answer:

dexar [7]3 years ago

5 0

Answer:

By using the techniques of archeology.

Explanation:

Students recover an individual's remains from a surface grave by using the techniques of archeology field to scrape away the layers of soil from that remains in a way that the remains can't be damaged. If they find the remains within 10 centimeters of digging, they can dig down further in order to dig out all the remains safely. The instruments of archeology field are used because they are light and can be used to dig out fossils of ancient organisms.

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When coal is burned to generate electricity, 70% of the primary energy in the coal is transformed into unused heat. This means t

Vinvika [58]

Answer:

0.3

Explanation:

The energy conversion efficiency is defined as the ratio of the useful output energy being generated by an energy machine to the input energy.It is denote by η.

The input and the useful output can be electric power, chemical, mechanical power, heat, etc.

Coal is being burnt to generate energy. Let the the input energy of coal be x units.

The energy lost in unused heat = 70% of x = 0.7x units

Useful output energy = 100% - 70% = 30% of x = 0.3x units

Thus,

η = Useful Energy/ Input energy

η = 0.3x/x = 0.3

Thus,

The energy conversion efficiency from chemical to electrical energy is 0.3.

5 0

3 years ago

Which BEST explains why the ice cube sank in the liquid?

ValentinkaMS [17]

If the ice cube sank, it means it’s more dense, normally ice cubes float though, then it would be less dense.

4 0

3 years ago

Read 2 more answers

A sample of gas weighs 10.1 g and occupies a volume of 5.65 l at 60 °c and 580 torr. Identify the gas sample.

OverLord2011 [107]

The question is incomplete, here is the complete question:

A sample of gas weighs 10.1 g and occupies a volume of 5.65 L at 60 °C and 580 torr. Identify the gas sample.

(a) $CHCl_3$ (molar mass = 119.4 g/mol)

(b) $N_2O$ (molar mass = 44.02 g/mol)

(d) $NH_3$ (molar mass = 17.03 g/mol)

(e) $Cl_2$ (molar mass = 70.90 g/mol)

Answer: The gas sample is $SO_2$ having molar mass of 64 g/mol

Explanation:

To calculate the molar mass of the gas, we use the equation given by ideal gas equation:

PV = nRT

Or,

$PV=\frac{w}{M}RT$

where,

P = Pressure of the gas = 580 torr

V = Volume of the gas = 5.65 L

w = Weight of the gas = 10.1 g

M = Molar mass of gas = ?

R = Gas constant = $62.36\text{ L. Torr }mol^{-1}K^{-1}$

T = Temperature of the gas = $60^oC=[60+273]K=333K$

Putting values in above equation, we get:

$580torr\times 5.65L=\frac{10.1g}{M}\times 62.364\text{ L. torr }mol^{-1}K^{-1}\times 333K\\\\M=\frac{10.1\times 62.364\times 333}{580\times 5.65}=64g/mol$

Hence, the gas sample is $SO_2$ having molar mass of 64 g/mol

4 0

3 years ago

I need D and E please I know the rest

Westkost [7]

Answer:

K2 +Br ->2KBr

K + I ->KI

actually I don't know the e option but I had tried can u pls balance it urself

6 0

3 years ago

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Every morning, Sarah prepares the same amount of coffee at the same temperature. Identify the coffee solution with the highest c

saw5 [17]

So if you are trying to find the coffee with the highest concentration of sugar, the cup that has the highest concentration of sugar is the cup that Sarah made on Thursday.

Since there were sugar molecules remaining at the bottom of her coffee cup, that means that the coffee solution was completely saturated with sugar - no more sugar was able to dissolve in the coffee.

6 0

4 years ago

Read 2 more answers