After absorption vitamins undergo chemical transformations while minerals do not.

1 answer:

3 0

TRUE

Vitamins are organic compounds and they undergo chemical changes in the metabolism to form new compounds or elements.

On the other hand, minerals are elements, which cannot suffer chemical changes. To change minerals should change the atoms, which is not possible and would not be a chemical change.

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Which of the following is evidence of a chemical change?

krek1111 [17]

the formation of a gas

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555mL of gas is combined at standard temperature and pressure(STP). The volume changes to 660.mL at 30.5 °C. What is the new pre

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Answer:0.94

Explanation:

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A chemistry student weighs out of hypochlorous acid into a volumetric flask and dilutes to the mark with distilled water. He pla

riadik2000 [5.3K]

Answer:

Volume of NaOH, aka V2 = 6.32 mL to 3 sig. fig.

A chemistry student weighs out 0.0941 g of hypochlorous acid (HClo) into a 250. ml. volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.2000 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Round your answer to 3 significant digits mL.

Explanation:

1 mole HClO = 74.44g

0.0941g = $\frac{0.0941}{74.44}$ = 0.00126 moles

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Hence, Concentration of HClO = 0.00126/ 0.250L

= 0.005M.

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Which type of mixture can be separated using a sieve?

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Answer:

D: a heterogeneous mixture with components of varying sizes

Heterogeneous mixture is a combination of substances that doesn't have uniform composition and properties. Just by looking at the mixture you can differentiate the compounds because they are so different. Using a sieve, allows the components with different sizes to separate, while one is retained, the others can pass the holes in the sieve.

Explanation:

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To convert the given value we need conversion factors to relate molecules to liters. At STP, we know that 1 mol is equal to 22.4 L and by using Avogadro's number we can relate molecules to 1 mol. Calculation is as follows:

5.0x10^24 molecules ( 1 mol / 6.022 x 10^23 molecules ) ( 22.4 L / 1 mol) = 186.0 L

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