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3 years ago

Match the careers in chemistry.

Chemistry

2 answers:

Fudgin [204]3 years ago

7 0

1. sales / marketing

2. theoretical research / information chemist

3. quality of life /environmental engineer

4. finds practical applications / R&D

5. manufacturing /production

6. market research /product development

7. short- and long-term objectives /corporate management

8. patent rights /legal services

9. services equipment /technician

Mandarinka [93]3 years ago

3 0

The careers in chemistry should be closely related to working with chemical substances and the methods involved in experiments. Thus, the answers are finds practical applications information chemist and market research R&D.

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34. 3.15 mol of an unknown solid is placed into enough water to make 150.0 mL of solution. The solution's temperature increases

Digiron [165]

Answer:

ΔH = 2.68kJ/mol

Explanation:

The ΔH of dissolution of a reaction is defined as the heat produced per mole of reaction. We have 3.15 moles of the solid, to find the heat produced we need to use the equation:

q = m*S*ΔT

Where q is heat of reaction in J,

m is the mass of the solution in g,

S is specific heat of the solution = 4.184J/g°C

ΔT is change in temperature = 11.21°C

The mass of the solution is obtained from the volume and the density as follows:

150.0mL * (1.20g/mL) = 180.0g

Replacing:

q = 180.0g*4.184J/g°C*11.21°C

q = 8442J

q = 8.44kJ when 3.15 moles of the solid react.

The ΔH of the reaction is:

8.44kJ/3.15 mol

= 2.68kJ/mol

5 0

3 years ago

A gas occupies 1.00 L at standard temperature. What is the volume at 333.0°C?

AURORKA [14]

We use Charles's Law: V1/T1=V2/T2

Standard Temperature: 0 degree Celsius= 273K
333.0 degrees Celsius= 606K

Set up: (1.00L)/ (273K)= V2/ (606.0K)
⇒ V2= (1.00L)/ (273K)* (606.0K)= 2.22L

Hope this would help :))

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3 years ago

Which is heavier? 30kg or 60lb?

Maurinko [17]

30kg think of it like this imagine you are moving to your college dorm would you have you carry the box if weights or will you carry your books instead

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3 years ago

Which type of reaction is Pb(NO3)2 + 2HCl → PbCl2 + 2HNO3?

Ganezh [65]

Answer:- D. Double- replacement reaction

Explanations:- In general, the decomposition reactions looks like:

$AB\rightarrow A+B$

The given reaction looks different than this and so it is not decomposition reaction.

A single-replacement reaction looks like:

$AB+C\rightarrow AC+B$

Our reaction looks different from this so single-replacement is also not correct.

Synthesis reaction looks exactly opposite to decomposition reaction.

$A+B\rightarrow AB$

The given reaction is different than this and so it is not synthesis reaction also.

A double-replacement reaction looks like:

$AB+CD\rightarrow AD+CB$

In this reaction, the ions are exchanged as could be seen in the general reaction. On reaction side,A is with B and C is with D. On product side, A is with D and C is with B.

The same is happening in the given reaction. Nitrate ion is with lead metal on reactant side and chlorine is with hydrogen, On product side, Chlorine is with lead metal and nitrate ion is with hydrogen. So, ion exchange has taken place here and so this is a double-replacement reaction and choice D is correct.

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3 years ago

Velocity and speed are both measurements of how fast something is moving however velocity is different from speed because

Novosadov [1.4K]

Im pretty sure the answer is d

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