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prisoha [69]
3 years ago
15

A substance with a pH of 4.0?

Chemistry
2 answers:
IrinaVladis [17]3 years ago
7 0
Tomato juice or acid rain
Anna35 [415]3 years ago
7 0
Phosphoric acid is a substance with a pH of 4.0
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Glucose is the monomer in the natural polymers ____________________ and cellulose.
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Answer:

Starch

I hope this helps

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2 years ago
Based on the location of nitrogen on the periodic table how many additional electrons does a nitrogen atom need in its valence s
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1 additional electron
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How many molecules of water are<br>present in a dogp of water which<br>has a mass of somg​
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5 0
2 years ago
Be sure to answer all parts. Rubidium and bromine atoms are depicted at right. Answer the following questions. (a) What is the c
finlep [7]

The complete question is found on the image attached.

Answer:

a) Rb= +1, Br= -1

b)Bromide and rubidium ions are related to krypton

c) C

Explanation:

Rubidium is found in group 1 with a charge of +1. Bromine is found in group 17 with a charge of -1. Both species have the same configuration as krypton. The ionic sizes of the ions are a very similar to each other Rb+ is 166 while Be is 167.

This RbBr is an ionic compound.

6 0
3 years ago
If we have three different solutions, A, B, and C, each containing 100 g of water, plus respectively 6.84 g of sucrose (C12H22O1
GenaCL600 [577]

Answer:

c. A and C have the same boiling point, but B has a lower one.

Explanation:

The freezing point depression is expressed as:

ΔT = kf×m

Where kf is the freezing point depression constant that depends the nature of the solvent and m is molality (mol of solute/kg of solvent)

Boiling point elevation is:

ΔT = kb×m

Where kb is the ebulloscopic constant of the solvent.

As kf, kb and mass of solvent is the same for A, B and C solutions the only difference will be in moles of solute.

<em>A </em>6,84g of sucrose are:

6,84g×\frac{1mol}{342,3g} = <em>0,002 moles</em>

<em>B </em>0,72g of ethanol are:

0,72g×\frac{1mol}{46,1g} = <em>0,0016 moles</em>

<em>C </em>0,40g of sodium hydroxide are:

0,40g×\frac{1mol}{40g} = <em>0,001 moles</em>

Using Van't Hoff factor that describes the number of moles in solution that comes from 1 mole of solute before dissolving, moles in solution for A, B and C are:

A. moles in solution: 0,02 moles×1 = <em>0,02 moles in solution</em>

B. moles in solution: 0,016 moles×1 = <em>0,016 moles in solution</em>

C. moles in solution: 0,01 moles×2 = <em>0,02 moles in solution</em>

As A has the same moles in solution of C, the freezing point depression will be the same in A and C, and the lower freezing point depression will be in B.

Also, the boiling point will be higher in A and C, and then in B.

Thus:

a. C has the lowest freezing point in the group.  <em>FALSE. </em>A and C have the lowest feezing point because have the higher freezing point depression.

b. A, B, and C all have different freezing points.  <em>FALSE. </em>As moles of A and C are the same, freezing point will be the same for the solutions.

c. A and C have the same boiling point, but B has a lower one.  <em>TRUE. </em>

d. The boiling point of C is lower than that of A or B . <em>FALSE. </em>Boiling point of C and A is higher than B.

e. A, B, and C will all have about the same freezing points. <em>FALSE</em>

7 0
3 years ago
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