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nlexa [21]
3 years ago
14

Draw the Lewis structure for N2H2

Chemistry
1 answer:
vodka [1.7K]3 years ago
6 0

Answer: this is dinitrogen dyhidride.

Explanation:

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uranmaximum [27]

Answer:

8. B

9. D

10. A

Explanation:

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4 0
2 years ago
What is the ph of a solution prepared by mixing 25.00 ml of 0.10 m ch3co2h with 25.00 ml of 0.020 m ch3co2na? assume that the vo
MaRussiya [10]

Answer:- The pH of the buffer solution will be 4.04 .

Solution:- Sodium acetate added to acetic acid makes a buffer solution and the pH of buffer solution is easily calculated by using Handerson equation:

pH=pKa+log(\frac{base}{acid})

We are adding 25.00 mL of each, so the total volume of the buffer solution will be 50.00 mL.

We can calculate the concentration of base which is sodium acetate and acid by using dilution equation:

M_1V_1=M_2V_2

M_2=\frac{M_1V_1}{V_2}

for base:

M_2=\frac{0.020*25.00}{50.00}

M_2=0.010M

Similarly, for acid:

M_2=\frac{0.10*25.00}{50.00}

M_2=0.050M

pKa is calculated from given Ka value as:

pKa=-logKa

pKa=-log(1.8*10^-^5)

pKa = 4.74

Let's plug in the values in Handerson equation:

pH=4.74+log(\frac{0.010}{0.05})

pH = 4.74 - 0.70

pH = 4.04

3 0
3 years ago
A 100-gram sample of material requires 1220 calories of heat energy to raise its temperature from 20 0C to 80 0C. What is the sp
SashulF [63]

Taking into account the definition of calorimetry, sensible heat and latent heat, the specific heat capacity of the material is 0.203 \frac{calories}{gC}.

<h3>Calorimetry</h3>

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

The amount of heat a body receives or transmits is determined by:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

<h3>Specific heat capacity of the material</h3>

In this case, you know:

  • Q= 1220 calories
  • c= ?
  • m= 100 g
  • ΔT=Tfinal - Tinitial= 80 C - 20 C= 60 C

Replacing in the definition of amount of heat:

1220 calories= c× 100 g× 60 C

Solving:

c= 1220 calories÷ (100 g× 60 C)

<u><em>c= 0.203 </em></u>\frac{calories}{gC}

Finally, the specific heat capacity of the material is 0.203 \frac{calories}{gC}.

Learn more about calorimetry:

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3 0
2 years ago
What are three different facts about mass<br> plz tel will give brainlyest
timama [110]

Answer: all mass takes up space. everything has mass. Theres a unit of mass called a slug thats not the bug!

Explanation:

7 0
2 years ago
Read 2 more answers
The body’s pH is tightly regulated because specific enzymes function best within a narrow pH range. What is the approximate pH o
tatuchka [14]

Answer:

The answer to your question is pH = 9.08

Explanation:

Data

pH = ?

Concentration = 1.2 x 10⁻⁵ M

Process

1.- Calculate the pOH of the solution

Formula

   pOH = -log[OH⁻]

   pOH = -log[1.2 x 10⁻⁵]

   pOH = 4.92

2.- Calculate the pH

Formula

    pH = 14 - pOH

Substitution

    pH = 14 - 4.92

Result

    pH = 9.08    

5 0
3 years ago
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