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4 years ago

which diagram best illustrates the ion-molecule attractions that occur when the ions of NaCl(s) are added to water

Chemistry

1 answer:

tatuchka [14]4 years ago

8 0

Diagram is on the picture below.
Answer is: 1).
Sodium chloride is ionic compound and in the water dissociate in sodium cation (positive charge) and chloride anion (negative charge). Water is polar compound, oxagan has negative charge and hydrogen charge. Positive interact witn negative charge and negative with positive charge.

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Consider the chemical reaction: 2 cu(no3)2â†’ 2 cuo (s) + 4 no2 (g) + o2 (g)when 9.378 g of cu(no3)2 completely decomposed, how

Allushta [10]

2Cu(NO3)2 ----------> 2CuO (s) +4NO2 (g) + O2(g)

9.378g=0.05moles

no of moles = weight / MW = 9.378/187.56 = 0.05moles

as per the above reaaction 2moles of Cu(NO3)2 can produce 4moles of N2

0.05moles Cu(NO3)2 can produce (0.05*4)/2 = 0.1moles of N2

and 2moles of Cu(NO3)2 can produce 1moles of O2

0.05moles Cu(NO3)2 can produce (0.05*1)/2 = 0.025moles of O2

Total moles of gas i.e., N2 and O2 =0.1+0.025 = 0.125moles

From PV = nRT

V = nRT/ P = 0.125*0.0821*273 = 2.80166Lit option is correct

6 0

3 years ago

Question 2 of 10 A chemist has a block of copper metal (density is 8.96 g/mL). They drop the metal into a graduated cylinder con

Paladinen [302]

Answer:

m = 25.98 g

Explanation:

Given data:

Density of copper metal = 8.96 g/mL

Volume of copper metal block = 2.90 mL

Mass of copper metal block = ?

Solution:

The volume of given block of copper is equal to the volume change of water by adding this block.

Density formula:

d = m/v

by putting values,

8.96 g/mL = m/ 2.90 mL

m = 8.96 g/mL × 2.90 mL

m = 25.98 g

5 0

3 years ago

Does the energy go from the surrounding to the chemicals or from the chemicals to the surround in an exothermic reaction?

Karo-lina-s [1.5K]

In general terms, exothermic reactions release energy, so the energy goes from the system to the surroundings.

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3 years ago

PLEASE HELP I AM FAILING

Gwar [14]

Answer:

160.3 g S

Explanation: there you go

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3 years ago

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Maru [420]

Cytotoxic is a characteristic of a medicine that bears the ability to cure cancer. The timing of the medication is very important because if not used properly, the substance or the drug may damage also even the healthy cells. Thus, it is just right to caution everyone, especially those who are involved, with the right usage of the drug.

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4 years ago