CHEMISTRY HIGH SCHOOL

If a plant needs to make 12.6 g of glucose(c6h1206), how many grams of water are required?

Answers

Answer 1

Answer:

Answer: 7.6 g of water are required to make 12.6 g of glucose

Explanation:

Moles is calculated by using the formula:

$Moles=\frac{\text{Given mass}}{\text{Molar mass}}$

${\text {moles of glucose}}=(12.6g)/(180g/mol)=0.07moles$

The balanced chemical equation is:

$6CO_2+6H_2O\rightarrow C_6H_(12)O_6+6O_2$

According to stoichiometry:

1 mole of glucose is produced by = 6 moles of water

Thus 0.07 moles of glucose is produced by = $(6)/(1)* 0.07=0.42$ moles of water

Mass of water required = $moles* {\text {Molar mass}}=0.42mol* 18g/mol=7.6g$

Thus 7.6 g of water are required to make 12.6 g of glucose

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What is the total mass of solute in 1000. grams of a solution having a concentration of 5 parts per million?(1) 0.005 g (3) 0.5 g
(2) 0.05 g (4) 5 g

Answers

Answer: The correct answer is (1).

Explanation:

Concentration of the solute in 1000 g of solution: 5 parts per million

1 part per million = 1 milligram/Liter

Then , 5 parts per million = 5 mg/liter

This means that 5 milligrams of solute is present in 1 liter solution.

1 gram = 1000 milligrams

Then 5 milligram = $5* (1)/(1000) g$ = 0.005 grams

Hence, 0.005 grams is the total mass of solute in 1000 grams of a solution having a concentration of 5 parts per million.

What are parts per million?

Parts per million (ppm) is how many parts a certain molecule or compound makes up within the one million parts of the whole solution.

Concentration of the solute in 1000 g of solution: 5 parts per million

1 part per million = 1 milligram/Liter

Then , 5 parts per million = 5 mg/liter

This means that 5 milligrams of solute is present in 1 liter solution.

1 gram = 1000 milligrams

Then 5 milligram = 5 X $(1)/(1000g)$ = 0.005 grams.

Hence, 0.005 grams is the total mass of solute in 1000 grams of a solution having a concentration of 5 parts per million.

Learn more about the parts per million here:

brainly.com/question/11912735

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Write briefly on scientific method

Answers

Answer:

Explanation:

a five step process that scientists use when they do their work.

1. ask a question

2. form a (testable) hypothesis or educated guess

3. conduct a controlled experiment (to test the hypothesis)

4. record & analyze results

5. develop a conclusion --> use the data from the experiment to see if it supports your hypothesis

What does Vitamin D do for the body?A. It transports oxygen to the muscles.
B. It converts glucose into energy.
C. It controls the way your body uses calcium.
D. It effectively rehydrates the system

Answers

Answer:

Explanation:

Vitamin D is a molecule that is essential in the transport of the Calcium to the bones, it can be obtained from direct contact with the sun or can be obtained directly from the diet. Besides transporting the Calcium to the bones, also participates in regulation of calcium and fosfate in the kidneys and intestine promoting the calcium reabsortion at renal level and calcium absortion at intestinal level. Also modulates the inmune system, promoting the maturation of monocytes to macrophages, improving the inmune response.

C. Controls the way your body uses calcium

The temperature of a sample of water increases from 20 degrees Celsius to 46.6 degrees Celsius as it absorbs 5650 calories of heat. What is the mass of the sample

Answers

ΔT = 46.6 - 20

ΔT = 26.6ºC

Specific heat of water is 1.0 cal/g °C

Q = m * C * ΔT

5650 = m * 1.0 * 26.6

5650 = m * 26.6

m = 5650 / 26.6

m = 212.4 g

hope thips helps!

What produces hydrogen ions as The only positive ions in aqueous solution

Answers

Mostly acids produces H+ ions. Acids dissociates into ions when in aqueous form resulting to hydronium or hydrogen ions and the other ion which has a negative charge. For instance, hydrochloric acid, it dissociates into H+ and Cl-.

Quantum theory states that _____. A. electrons orbit the nucleus of an atom B. electrons cannot be created or destroyed C. electrons have both wave-like and particle-like properties D. the exact position of an electron within an atom can be calculated

Answers

Answer:

Its C. electrons have both wave-like and particle-like properties

Explanation:

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Einstein’s Theory of Relativity was built on the research and ideas of other scientists. The Theory of Relativity proposes that the speed of light is a constant. Which of the following statements explains why this is considered to be a scientific theory?