After photosynthesis what happens to the sugar that the plant creates?

Shells constructed from seawater incorporate the 18O/16O ratio of seawater during their lifetime within their CaCO3 shell walls,

Ksivusya [100]

Answer:

Hello, the above question is not complete, nonetheless let us check somethings out.

Explanation:

Paleothermometer definition is from two words, that is "Paleo" which means something that is old and ''thermometer" which is an instrument for measuring temperature. So, if we add this up, Paleothermometer is an instrument for measuring "old" temperature, that is temperature. One of the Paleothermometer that is been used is the δ18O which is the one in the question that has isotopic ratio of 18O/16O, and it deals with the measurement of 18O to 16O. The others include Alkenones Paleothermometer, Mg/Ca Paleothermometer, Leaf physiognomy and so on.

If the values of the isotopic ratio that is 18O/16O ratio is low, then the temperature is high. To Calculate the 18O/16O ratio for ancient ocean then we will be using the equation below;

δ18O = (z - 1) × 1000. Where z= [(18O/16O)/( 18O/16O)sm. And sm= standard mean.

6 0

3 years ago

The symbol delta (Δ) indicates that the reactant or the product is in an aqueous solution.

melisa1 [442]

You need to give more explanation about it but if i understand a little abt what ur saying so i thinks it’s true

6 0

3 years ago

An ion that consists of 7 proton,7 neutrons and 10 electrons has a net charge of ?

natulia [17]

Answer:

C. 3-

Explanation:

Protons have an individual charge of 1+, neutrons have no individual charge, and electrons have an individual charge of 1-.

So the total charge from protons is 7+ and electrons 10-, which gives a net charge of 3-.

8 0

3 years ago

When 10.9 g CaCO3 reacts with excess hydrochloric acid, as below, 3.79 g of CO2 is produced. What is the percent yield of CO2? D

erastovalidia [21]

Answer:

Yield of CO₂ = 79.1 %

Explanation:

This is the balanced reaction:

CaCO₃ (s) + 2HCl (aq) → CO₂ (g) + CaCl₂ (aq) + H₂O (l)

As the hydrochloric acid is in excess, the limiting reactant is the CaCO₃.

Let's convert the mass to moles

10.9 g / 100.08 g/mol = 0.109 moles

Ratio is 1:1, so 0.109 moles of CaCO₃ will produce the same amount of CO₂.

Let's determine the mass

0.109 moles of CO₂ . 44 g/mol = 4.79 g

Now, we can determine the yield

(yeild produced / theoretical yield) . 100 =

(3.79 / 4.79) . 100 = 79.1%

7 0

3 years ago

The dissolution of 7.75 g of a substance in 825 g of benzene (C6H6) at 298 K raises the boiling point by 0.575 ◦C. Note that kf

Dennis_Churaev [7]

Answer:

a) The freezing point depression = 1.16 °C

b) Psolution = 101.2 torr Psolution/Psolvent = 101.2 / 103 = 0.983

c) osmotic pressure π = 4.85 atm

d) Molecular weight = 41.4 g/mol

Explanation:

Step1 : Data given

Mass of substance = 7.75 grams

Mass of benzene = 825 grams

Boiling point elevation = 0.575 °C

Kf = 5.12 C/m

Kb = 2.53 C/m

Density = 876.6 Kg /m³ = 0.8766 g/mL

Step 2 Calculate the molaltiy

ΔT = i*Kb*m

⇒ΔT = the boiling point elevation = 0.575 °C

⇒i = the van't Hoff factor = 1

⇒Kb = the boiling point constant = 2.53 °C/m

⇒with m = TO BE DETERMINED

0.575 = 2.53 * m

m = 0.227 molal

Step 3: Calculate the freezing point depression

ΔT = i*Kf*m

⇒ΔT = the freezing point depressio, = TO BE DETERMINED

⇒i = the van't Hoff factor = 1

⇒Kb = the freezing point constant = 5.12 °C/m

⇒with m = 0.227 molal

ΔT = 5.12 °C/m * 0.227 m

ΔT = 1.16 °C

Step 4: Calculate the molar mass of the solute

Molality = moles / mass benzene

0.227 molal = moles / 0.825 kg

Moles substance = 0.227 * 0.825

Moles substance = 0.187 moles

Molar mass = mass / moles

Molar mass substance = 7.75 grams / 0.187 moles

Molar mass substance = 41.4 g/mol

Step 5: Calculate the ratio of the vapor pressure above the solution to that of the pure solvent,

Moles benzene = 825 grams / 78.11 g/mol

Moles benzene = 10.56 moles

Mol fraction benzene = 10.56 moles /(10.56 + 0.187 )

Mol fraction benzene = 0.983

Psolution = 103 * 0.983 = 101.2 atm

Step 5: Calculate moles substance

Moles substance = 7.75 grams / 41.4 g/mol

Moles substance = 0.187 moles

Step7: Calculate volume

Volume = mass / density

Volume = 825 * 10^-3 / 876.6

Volume = 0.942 L

Step 7 Calculate osmotic pressure

π = i*M*R*T = i n/V * R*T

⇒π = the osmotic pressure = TO BE DETERMINED

⇒i = the van't Hoff factor = 1

⇒M = the molar concentration = n/V

⇒R = the gas constant = 0.08206 L*atm/mol*K

⇒T = the temperature = 298 K

π = 1 * (0.187 moles / 0.942L) * 0.08206 * 298 K

π = 4.85 atm

5 0

3 years ago