CHEMISTRY HIGH SCHOOL

If the Earth can fit 1000billion people, why is the
human carrying capacity
likely only between 10-15
billion?

Answers

Answer 1
Answer:

Answer:

because people are not having babies fast enough

Explanation:
Answer 2
Answer: Because a lot people are not producing babies faster

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The capacity of a muscle to continue contracting over a period of time without fatigue is called: A. muscular strength.
B. muscular endurance.
C. cardiovascular endurance.
D. power.

Answers

B. muscular endurance

The capacity of a muscle to continue contracting over a period of time without fatigue is called muscular endurance.
NOT:
A. muscular strength. 
C. cardiovascular endurance. 
D. power.

Which describes a spontaneous reaction? a. Positive ΔH
b. Negative ΔH
c. Positive ΔG
d. Negative ΔG
e. Positive ΔS

Answers

C. ) Negative Delta G is the answer that describes a spontaneous reaction
The answer is D
For Delta G the negative number is always spontaneous because it is less than 0

In Dna, guanine always forms hydrogen bonds with?

Answers

The DNA or deoxyribonucleic acid is composed of a pentose sugar, a base and phosphate group. The bases are adenine, thymine, cytosine and guanine. Guanine always forms hydrogen bonds with cytosine. Remember the statement “Apples in the Tree, Cars in the Garage”. The A stands for adenine and pairs with T-thymine then C – cytosine and G – guanine. 

The specific heat of water is 4.18 J/(g * °C) How much heat, in kilojoules, must be added to 250 g of water to increase the temperature of the water by 5.0°C?

Answers

You need to use the equation q=mcΔT.
q=the heat absorbed or released
m= the mass of the sample (in this case 250g)
c=the specific heat of the sample (in this case 4.18J/g°C)
ΔT=the change in temperature (in this case 5°C)
When you plug every thing in you should get q=5225J or 5.225kJ

I hope this helps.  Let me know if anything is unclear.

Answer the following questions: On a 10-fold dilution of a weak acid, the pH will ______________ . On a 10-fold dilution of a weak base, the pH will ______________. If one adds a very small amount of strong base to a buffered solution, the pH will _______________. Can you make a buffer using a strong acid

Answers

Answer:

i) increase

ii) decrease

iii) remain the same

iv) No, because it dissociates completely.

Explanation:

On a 10-fold dilution of a weak acid, the pH will increase because the concentration of hydrogen ions will decrease thereby increasing the pH to close to that of water.

On a 10-fold dilution of a weak base, the pH will decrease due to the removal of hydroxide ions from the solution. This results in the solution having a H closer to that of water.

If one adds a very small amount of strong base to a buffered solution, the pH will remain constant because a buffer solution acts to withstand any change to its pH on the addition of small quantities of either an acid or a base.

A buffer solution cannot be made with a strong acid because thy undergo complete dissociation. Therefore, any small addition of base or acid will result in very large changes in the pH of the solution. A buffer solution is made with a weak acid and its conjugate base or a weak base and its conjugate acid.

What is the volume of solution needed to make a 0.5M solution, using 250g of NaCl

Answers

1 mole of NaCl has (23+35.5)g= 58.5g

Therefore, to  make 1M/L of solution you will need 58.5g Then to make 0.5M/L you will need 58.5/2=29.25g

If to make 1liter of 0.5M one will need 29.25 grams of NaCl, then250g of NaCl will make

(250g×1L)/29.25g= 8.547liters
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