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3 years ago

Science question down below

Chemistry

1 answer:

kolezko [41]3 years ago

4 0

There is only 1 negative choice here, so you can solve by common sense.
C. They reproduce slower than unicellular organisms.

This is true because, for example, think of humans. We take 9 months to reproduce uses multiple stages of meiosis. Unicellular organisms on the other hand, such as bacteria, are asexual and use binary fission to reproduce, which happens very quickly, but creates less diversity.

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When a 0.245-g sample of benzoic acid is combusted in a bomb calorimeter, the temperature rises 1.643 ∘C . When a 0.260-g sample

sveticcg [70]

Answer:

The heat of combustion per moles of caffeine is 4220 kJ/mol

Explanation:

Step 1: Data given

⇒ When benzoic acid sample of 0.245 grams is burned the temperature rise is 1.643 °C

⇒ When 0.260 gram of caffeine is burned, the temperature rise is 1.436 °C

⇒ Heat of combustion of benzoic acid = 26.38 kJ/g

Step 2: Calculate the heat released: for combustion of benzoic acid

0.245 g benzoic acid * 26.38 kJ/g = 6.4631 kJ

Step 3: Calculate the heat capacity of the calorimeter:

c = Q/ΔT

Q = 6.4631 kJ / 1.643°C = 3.934 kJ/ °C

Step 4: Calculate moles of a 0.260 g sample of caffeine:

Moles caffeine = Mass caffeine / Molar mass caffeine

0.260 grams/ 194.19 g/mol = 0.0013389 moles

Step 5: Calculate heat released: for combustion of caffeine

Q = c * ΔT

Q = 3.934 kJ/°C * 1.436 °C = 5.65 kJ

Step 6: Calculate the heat of combustion per mole of caffeine

5.65 kJ / 0.0013389 moles = 4219.9 kJ/mol ≈ 4220 kJ/mol

The heat of combustion per moles of caffeine is 4220 kJ/mol

4 0

3 years ago

Which of the following is an example of maintaining homeostasis? A. Learning B. Jumping C. Shivering D. Smiling

yawa3891 [41]

Answer:

Shivering.

Explanation:

Homeostasis is the bodies need to keep things at a normal. When you are cold you shiver to produce body heat and get back to normal

5 0

3 years ago

If the pH of a solution is 5.4 then the concentration of H+ ions is ___|_x10^-6

Svetllana [295]

H is 4*10^6 M , OH is 2.5*10^-9 M

6 0

3 years ago

26 grams of CO2 to moles

neonofarm [45]

First, find out how many grams are in one mole of CO2(the two oxygen atoms means you need to multiply oxygen’s amu by 2,then add whatever carbon’s amu is to that). Then divide 26 grams by that number and that will be your moles. There are only two significant figures, so round your answer correctly.

4 0

3 years ago

The rate of evaporation is affected by all of the following except

lidiya [134]

Hello there.

The rate of evaporation is affected by all of the following except

Answer: B. the humidity.

8 0

3 years ago

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