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4 years ago

When calculating molar mass , can you round it or it has to be specific ?

1 answer:

3 0

For many (but not all) problems, you can simply round the atomic weights and the molar mass to the nearest 0.1 g/mole. HOWEVER, make sure that you use at least as many significant figures in your molar mass as the measurement with the fewest significant figures. In other words, never let your molar mass be the measured value that determines how many signficant figures to use in your answer!

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Each of the given statements describes a type of column chromatography. Match the statements to the type of chromatography they

vlada-n [284]

Answer:

The proper matching is given below.

Explanation:

a Separate molecules by size size exclusion chromatography

b Separate molecules by charge Ion exchange chromatography

c The stationary phase has a covalently bound group to which a protein in the mobile phase can bind. Affinity chromatography

d uses mobile phase and stationary phase to separate protein Size exclusion chromatography

e The stationary phase contain cross linked polymers with different pore size

Size exclusion chromatography

f can separate molecules based on protein ligand binding Affinity chromatography

g The stationary phase may contain negatively or positively charged groups

ion exchange chromatography

6 0

3 years ago

What is another name for a homogeneous mixture?

nikdorinn [45]

Answer:

E. a solution

Explanation:

A solution is a homogeneous mixture that consists of two or more substances.

A. and D. are wrong. Compounds and pure substances are homogeneous they consist of a single substance.

B. and C. are wrong. Solvents and solutes are the components of a mixture.

8 0

3 years ago

What are the products?

LuckyWell [14K]

I think it would be option 4?

7 0

3 years ago

Read 2 more answers

Write a balanced chemical equation for the fermentation sucrose (C12H22O11) by yeasts in which the aqueous ethyl alcohol (C2H5OH

kodGreya [7K]

Answer:

C12H22O11(aq) + H2O(l) —> 4C2H5OH(aq) + 4CO2(g)

Explanation:

When aqueous sugar (sucrose) react with water in the presence of yeast, the following products are obtained as shown in the equation below:

C12H22O11(aq) + H2O(l) —> C2H5OH(aq) + CO2(g)

Now, we shall balance the equation as follow:

There are a total of 24 atoms of H on the left side and 6 atoms on the right side. It can be balance by putting 4 in front of C2H5OH as shown below:

C12H22O11(aq) + H2O(l) —> 4C2H5OH(aq) + CO2(g)

There are a total of 9 atoms of C on the right side and 12 atoms on the left side. It can be balance by putting 4 in front of CO2 as shown below:

C12H22O11(aq) + H2O(l) —> 4C2H5OH(aq) + 4CO2(g)

Now the equation is balanced.

8 0

3 years ago

Which of the following metals reacts with aqueous Cubo A) Au B) Ag C) Hg D) all of the above E) none of the above

Yanka [14]

Answer:

E) None of the above

Explanation:

Metals react according to the activity series, thta is organized with the leats metals in in the bottom and the most reactive metals in the top. Most reactive metals displace less reactive metals in the compounds they are found.

in this series, Gold, Silver and Mercury are below Copper, this is, they are less reactive than Cu. this means none of them can displace it from its compounds.

4 0

3 years ago