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3 years ago

5

How are freezing and condensation alike?

1 answer:

bija089 [108]3 years ago

6 0

Answer:

A. Both describe ways a solid can change.

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Examples of polar covalent bonds

mars1129 [50]

A water molecule, abbreviated as H2O, is an example of a polar covalent bond. The electrons are unequally shared, with the oxygen atom spending more time with electrons than the hydrogen atoms. Since electrons spend more time with the oxygen atom, it carries a partial negative charge.

8 0

3 years ago

Choose the aqueous solution that has the highest boiling point. These are all solutions of nonvolatile solutes and you should as

UNO [17]

Answer: 0.100 m $K_2SO_4$

Explanation:

Elevation in boiling point is given by:

$\Delta T_b=i\times K_b\times m$

$\Delta T_b=T_b-T_b^0$ = Elevation in boiling point

i= vant hoff factor

$K_b$ = boiling point constant

m= molality

1. For 0.100 m $K_2SO_{4}$

$K_2SO_4\rightarrow 2K^{+}+SO_4^{2-}$

, i= 3 as it is a electrolyte and dissociate to give 3 ions. and concentration of ions will be $3\times 0.100=0.300$

2. For 0.100 m $LiNO_3$

$LiNO_3\rightarrow Li^{+}+NO_3^{-}$

, i= 2 as it is a electrolyte and dissociate to give 2 ions, concentration of ions will be $2\times 0.100=0.200$

3. For 0.200 m $C_2H_8O_3$

, i= 1 as it is a non electrolyte and does not dissociate, concentration of ions will be $1\times 0.200=0.200$

4. For 0.060 m $Na_3PO_4$

$Na_3PO_4\rightarrow 3Na^{+}+PO_4^{3-}$

, i= 4 as it is a electrolyte and dissociate to give 4 ions. and concentration of ions will be $4\times 0.060=0.24m$

Thus as concentration of solute is highest for $K_2SO_4$ , the elevation in boiling point is highest and thus has the highest boiling point.

3 0

3 years ago

Number of neutrons for 9BE4

GREYUIT [131]

Mass number - # of protons = #neutrons, so I would say the answer is 5

8 0

3 years ago

How closely a measurement reflects the actual value is precision. True or False??

Rina8888 [55]

Answer:

very very very verytrue

7 0

3 years ago

Heating a carboxylic acid with a primary amine forms water along with what organic product? OA) A secondary amide OB) A primary

Bezzdna [24]

Answer:

A) secondary amide

Explanation:

When carboxylic acid reacts with a primary amine, a condensation reaction takes place with the elimination of a water molecule .

For example, ethanol reacts with methylamine which is a primary amine gives N-Methylacetamide and a water molecule as:

$CH_3COOH+NH_2CH_3\rightarrow CH_3-CONH-CH_3+H_2O$

The bond formed which is

O

||

-- C ---NH ---

is known as secondary amide group as only one hydrogen is attached to nitrogen atom in the amide bond.

5 0

3 years ago