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saul85 [17]
3 years ago
12

Item 4

Chemistry
1 answer:
STALIN [3.7K]3 years ago
5 0
Cells make up tissues. Tissues make up organs, organs make up systems, systems make up organism
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____________ cycles connect biological, geological and chemical aspects of organisms in a biosphere.
Ray Of Light [21]
It is D.....i took the test and got it right!!!!!!!
8 0
3 years ago
Read 2 more answers
On a 10 day wilderness expedition you'll need to heat 4.0kg of water to the boiling point each day. The air temperature will ave
const2013 [10]

Explanation:

It is known that relation between heat energy, mass and temperature change is as follows.

                q = mC \times \Delta T

where,   C = specific heat of water (in given case) = 4.184 kJ/kg ^{o}C

              m = mass

          \Delta T = change in temperature

Therefore, calculate the heat energy as follows.

              q = mC \times \Delta T

                 = 4 kg \times 4.184 kJ/kg^{o}C \times (100 - 25)^{o}C

                =  1255.2 kJ/day

For 10 days, total heat required is as follows.

                10 \times 1255.2

               = 12552 kJ

It is known that the value of standard enthalpy of combustion of butane is -49.5 kJ/g.

Therefore, combustion of 1 gm of butane will be 49.5 kJ. Hence, total amount of butane required will be as follows.

                  \frac{12552 kJ}{49.5 kJ/g}

                     = 253.57 g

As it is given that 1 canister of butane contains 75 g butane. Hence, no. of canisters required are as follows.

         No. of canisters required = \frac{253.57}{75}  

                                                    = 3.38

                                                    = 4 (approximately)

Thus, we can conclude that minimum number of fuel canisters you must bring are 4.

3 0
3 years ago
Answer both questions
DaniilM [7]
1. True
2. 3.5 miles northwest
3 0
3 years ago
If a substance goes from the gas phase to the liquid phase, was it heated or cooled
Neporo4naja [7]
When a substance goes from 1 state of matter to a another state of matter, the process is a change of state. What i found out is that it can be heated, whenever the substance goes to another phase i mostly heard, and reasearched that it goes to heated.
4 0
3 years ago
Consider again the solution made by diluting 10.0 mL of the 0.50 M NaCl by adding distilled water until 100 mL of solution are p
ivolga24 [154]
<h3>Answer:</h3>

The concentration of the diluted salt solution decreased

<h3>Explanation:</h3>

When a solution is diluted the concentration of then solution decreases and the volume of the solvent increases.

In this case;

The initial concentration is 0.50 M

The initial volume is 10.0 mL

The volume after dilution is 100 mL

We are required to determine the change in the final concentration;

According to the dilution equation;

M1V1 = M2V2

M2 = M1V1 ÷ V2

Therefore;

M2 = (0.5 M × 10.0 mL) ÷ 100mL

      = 0.05 M

Therefore, the concentration of the solution decreased after dilution.

3 0
4 years ago
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