CHEMISTRY HIGH SCHOOL

One way to limit deforestation is bya. practicing crop rotation.
b. increased soil fertilization.
c. increased use of wood products.
d. using wood from trees grown on tree farms.

Answers

Answer 1
Answer: One way to limit deforestation by practicing crop rotation. The correct option among all the options given in the question is option "a". Crop rotation will keep the farmers from further cutting of forests to gain fresh lands. This will also decrease the use of wood products. The soil will also gain strength due to rotation of crop.
Answer 2
Answer:

Answer:

d. using wood from trees grown on tree farms.

Explanation:

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In a compound, chemical energy is contained in thea. nuclei of the atoms.b. unbonded electrons.c. bonds.d. movement of the electrons.
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Your boss asks you to design a room that can be as soundproof as possible and provides you with threesamples of material. The only information on each sample's label is the material's coefficient of absorption.
The coefficient of absorption listed on Sample A is 30%, on Sample B is 47%, and on Sample C is 62%.
When your boss asks for your choice and the reasoning behind it, what would you tell him?
A. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the smallest.
B. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the smallest.
C. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the largest.
D. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the largest.

Answers

Answer: The correct answer is Option C.

Explanation: For a room to be soundproof, there should be minimum reflection of the sound waves and maximum absorption of the waves.

According to the question, the coefficient of absorption is maximum for Sample C. So, this sample will reflect minimum waves and will absorb maximum waves.

Hence, this sample is the best for making the room soundproof. Hence, the correct answer is Option C.
The right answer for the question that is being asked and shown above is that: "B. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest."

An antacid tablet containing 0.50 g of NaHCO3 is dissolved in 250 mL of water. What is the molar concentration of NaHCO3 in the solution?

Answers

1 mole of NaHCO3 = 84g

1 mole of NaHCO3--------------84g
x moles of NaHCO3----------0,50g
x = 0,00595 moles of NaHCO3

0,00595 moles of NaHCO3----------in--------250ml
x moles of NaHCO3-------------------in-----------1000ml
x = 0,0238 moles of NaHCO3

answer: the molar concentration of NaHCO3 is 0,0238mol/l

Hello!

An antacid tablet containing 0.50 g of NaHCO3 is dissolved in 250 mL of water. What is the molar concentration of NaHCO3 in the solution ?

  • We have the following data:

M (Molar Concentration or Molarity) = ? (in mol/L)

m (mass) = 0.50 g

V (volume) = 250 mL → 0.25 L

MM (Molar Mass of NaHCO3)

Na = 1*(23u) = 23 u

H = 1*(1u) = 1 u

C = 1*(12u) = 12 u

O = 3*(16u) = 48 u

-------------------------------

MM (Molar Mass of NaHCO3) = 23 + 1 + 12 + 48 = 84 g/mol

  • We apply the data found to the formula of molar Concentration or Molarity, let's see:

M = (m)/(MM*V)

M = (0.50)/(84*0.25)

M = (0.50)/(21)

M = 0.023809... \to \boxed{\boxed{M \approx 0.024\:mol/L}}\:\:\:\:\:\:\bf\purple{\checkmark}

Answer:  

The Molar Concentration is approximately 0.024 mol/L

________________________

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A neutron star that spins and emits beams of energy is called a _____.protostar
red dwarf
white dwarf
pulsar
black hole

Answers

Answer:

The correct answer is pulsar.

Explanation:

Protostar : Its a young star with contracting mass which gains mass from its parent molecular cloud. At this stage fusion process does not start.

Red dwarf:  A star having lower surface temperature , luminosity, mass and size than of the sun.

White dwarf : its an ultimate stage for an average mass star like sun . its a small dense star with size relatively equal to planet.

Pulsar :  A rotating neutron star that emits beam of radio waves and other electromagnetic radiations.

Black hole:  It is region of space time with very strong gravitational pull that even smallest particle or electromagnetic wave is incapable to escape it.
I believe its a pulsar

Most commercial sports drinks area. calcium-rich.
b. good recovery sources.
c. sodium-poor.
d. highly concentrated

Answers

C. sodium poor is the answer

C. Sodium Poor - I took the test and got it correct

2 ways in which the carbon is stored for a long time

Answers

1) Carbon can be stored as chemical energy in the cells of the plant or the animal. So, the carbon will stay stored as part of the organic material that makes up the plant or animal until it dies. When a plant or animal dies, it either decomposes and the carbon is released back into the environment; or the organic material of the organism is buried and transformed over millions of years into coal, oil, or natural gas. 
2)Another way that carbon is stored for long periods of time is when carbon is used by ocean organisms. Many ocean creatures use calcium carbonate (CaCO3) to make their shells or to make the reef material where coral animals live. When algae die, their organic material becomes part of the ocean sediments, which may stay at the bottom of the ocean for many years. Over millions of years, those same ocean sediments can be forced down into the mantle when oceanic crust is consumed in deep ocean trenches. As the ocean sediments melt and form magma, carbon dioxide is eventually released when volcanoes erupt.

Why is mass conserved in
chemical reactions?

Answers

Even in a chemical reaction when atoms interact and create new products, mass is conserved. This is because the new substances created are composed of atoms that were present in the reactants. ... No new atoms have entered or left the system so the mass is conserved.
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