CHEMISTRY HIGH SCHOOL

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 1
Answer:

Answer:

C.

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.
Answer 2
Answer: C. Controls the way your body uses calcium

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A person’s blood alcohol (C2H5OH) level can be determined by titrating a sample of blood plasmawith potassium dichromate solution. The balanced equation is:16 H+ (aq) + 2 Cr2O7 2-(aq) + C2H5OH (aq) ? 4 Cr3+ (aq) + 2 CO2 (g) + 11 H2O (l)If 35.46 mL of 0.05961 M Cr2O7 2-is required to titrate 28.00 g of plasma, what is the mass percentof alcohol in the blood?

The molarity of an aqueous sodium phosphate solution is 0.650 M. What is the molality of sodium ions present in this solution? The density of solution is 1.43 g/mL.

Answers

Answer:

molality of sodium ions is 1.473 m

Explanation:

Molarity is moles of solute per litre of solution

Molality is moles of solute per kg of solvent.

The volume of solution = 1 L

The mass of solution = volume X density = 1000mL X 1.43 = 1430 grams

The mass of solute = moles X molar mass of sodium phosphate = 0.65X164

mass of solute = 106.6 grams

the mass of solvent = 1430 - 106.6 = 1323.4 grams = 1.3234 Kg

the molality = (moles of solute)/(mass of solvent in kg)=(0.65)/(1.323)= 0.491m

Thus molality of sodium phosphate is 0.491 m

Each sodium phosphate of molecule will give three sodium ions.

Thus molality of sodium ions = 3 X 0.491 = 1.473 m

What element is found in amino acid that isn’t found in simple sugars like glucose or fructose?

Answers

Nitrogen is the major atom that is present in amino acids that are not present in carbohydrates.

1) Look at the graph. What is the independent variable and the dependent variable?

Answers

Answer:

Independent Variable = Years

Dependent Variable = Number of Mobiles phone owners

Explanation:

Independent variables are plotted on x-axis and the dependent variables are plotted on y-axis.

In given graph the "Years" belong to x-axis hence, years are the independent variables.

Also, "Number of Mobile phones owners" belong to y-axis hence, this number is the dependent variable.

In a titration, 20.0 milliliters of 0.15 M HCI(aq) is exactly neutralized by 18.0 milliliters of KOH(aq).Complete the equation in your answer booklet for the neutralization reaction by writing the formula of each product.

KOH(aq) + HCl(aq)==> ________ +________

Compare the number of moles of H+(aq) ions to the number of moles of OH-(aq) ions in the titration mixture when the HCl(aq) is exactly neutralized by the KOH(aq).

Determine the concentration of the KOH(aq).

Answers

The reaction yields H2O and KCl (remember that neutralization reactions produce water and a salt).When HCl is exactly neutralized by KOH, you are left with no excess H+ or OH- from the strong acid or strong base. Also, since both the acid and base are strong, their conjugate base and conjugate acid, respectively, have negligible basicity. Therefore, the final solution is of neutral pH and there are equal amounts of H+(aq) and OH-(aq).Since the acid is monoprotic and the base releases only 1 OH- per molecule dissociated, you need not worry about dissociation constants. In this case, you find the molarity using M1V1 = M2V2. You are finding M2, so M2 = M1V1/V2 = (0.15)(20.0)/(18.0) = 0.17M (this is considering significant figures).

How is electron movement related to covalent bonding in ammonia, NH3?A) Electrostatic sharing in a sea of electrons around the atoms allows bonds to form.
B) The atomic orbitals overlap and electrons are shared between the atoms forming bonds.
C) A transfer of electrons forms ions which are electrostatically attracted forming bonds.
D) Orbital exchange occurs between the atoms to redistribute the electrons and form bonds.

Answers

Answer:

B

Explanation:

A) The sea of electrons only happen with metalic bond, a bond with two metalic elements.

B) As both elements in ammonia (N and H) are non-metals we don't observe an transfer of electrons, both elements share the number of electrons needed to stablize it (3 electrons for the N and 1 for the H).

C) To have a transfer of electrons, we need a bond between a metal and a non-metal, in this case, N and H are non-metals, so this doesn't happen.

D) The electrons are shared, only the electrons nothing happens between the orbitals.

How is electron movement related to covalent bonding in ammonia, NH3?

A) Electrostatic sharing in a sea of electrons around the atoms allows bonds to form. 
B) The atomic orbitals overlap and electrons are shared between the atoms forming bonds. 
C) A transfer of electrons forms ions which are electrostatically attracted forming bonds. 
D) Orbital exchange occurs between the atoms to redistribute the electrons and form bonds.

The electron movement related to covalent bonding in ammonia, NH3 is The atomic orbitals overlap and electrons are shared between the atoms forming bonds. The answer is letter B.

How do the products and reactants of a chemical change compare? The mass of the products is greater than the mass of the reactants because energy is absorbed by the reaction.

The mass of the products equals the mass of the reactants because energy is not absorbed or given off by the reaction.

The mass of the products is less than the mass of the reactants because energy is given off by the reaction.

The mass of the products equals the mass of the reactants because the same atoms are present throughout the reaction

Answers

The right answer for the question that is being asked and shown above is that: "The mass of the products equals the mass of the reactants because the same atoms are present throughout the reaction." -- The products and reactants of a chemical change should be compared
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