<h3><u>Answer;</u></h3>
A) HNO3 and NO3^-
<h3><u>Explanation;</u></h3>
- <em><u>HNO3 is a strong acid and NO3 is its conjugate base, meaning it will not have any tendency to withdraw H+ from solution.</u></em>
- Buffers are often prepared by mixing a weak acid or base with a salt of that weak acid or base.
- The buffers resist changes in pH since they contain acids to neutralize OH- and a base to neutralize H+. Acid and base can not consume each other in neutralization reaction.
According
picture I find on internet (http://prntscr.com/gel41e<span>) answers are:
A - 1. Carbon dioxide is converted
to sugar used for food.
G - 2. Carbon trapped in fossil fuels is converted to carbon dioxide.
E - 3. Organic carbon is converted to
fossil fuels.
H - 4. Carbon dioxide is converted
to carbonates.
F - 5. Sugar is broken down and converted
to carbon dioxide.</span>
<span>2) No, chemical energy is transfered into mechanical energy in cars for example, where combustion of gasoline moves turbines.</span>
3) Yes, this process is called photosynthesis. Solar energy is stored in chemical bonds.
4) Arrow C- combustion of organic matter and release of CO2 and arrow F is respiration (oxygen turns into carbon dioxide.
<span>5) Question 9: For example arrow E represent process of cycle carbon from organic dead organism to nonorganic carbon.</span>
6) Question 10: Arrows B and C because carbon from goes from inorganic to organic matter and his mass remains the same on Earth.
Answer:
391.46 L
Explanation:
Given:
Initial temperature of the water = 23.4°C
Final temperature of the water = 39°C
Temperature change for the water, ΔT = (39 - 23.4) = 15.6°C
Heat absorbed by the water = 2.55 × 10⁴ kJ = 2.55 × 10⁷ J
Density of the water = 0.998 g/mL
Specific heat of the water, C = 4.184 J/g°C
Now,
The heat absorbed by the water, q = mCΔT
where, m is the mass of the water
Thus,
we have
2.55 × 10⁷ J = m × 4.184 × 15.6
or
m = 390682.45 grams
also,
Density = mass / volume
thus,
0.998 = 390682.45 / volume
or
Volume = 391465.38 mL
or
Volume = 391.46 L
Atomic mass is number of protons + number of neutrons (disregard electrons in mass calculations). 104 + 157 = 261.
24= y2k* - 2x H202 grams in mass
