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3 years ago

Which of the following represents a chemical change?

Chemistry

1 answer:

Nikitich [7]3 years ago

7 0

Answer:

Option B : burning of wood

Explanation:

Chemical change is a change where a new substance is created like when you will bur wood you get ash this is a new substance, so burning of wood is a chemical change.

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How are nucleic acids and proteins similar?

Virty [35]

The answer is A - they are both polymers.

3 0

3 years ago

Read 2 more answers

Which of the following pair has a larger size? a)K or K- b)Br or Br- c)O2- or F- d) Li or Na

Anna11 [10]

Answer:

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Explanation:

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3 years ago

Initially, 0.65 mol of PCl5 is placed in a 1.0 L flask. At equilibrium, there is 0.15 mol of PCl3 in the flask. What is the equi

borishaifa [10]

Answer : The equilibrium concentration of $PCl_5$ is, 0.50 M

Explanation : Given,

Initial moles of $PCl_5$ = 0.65 mole

Volume of solution = 1.0 L

Moles of $PCl_3$ at equilibrium = 0.15 mole

The balanced equilibrium reaction will be,

$PCl_5\rightleftharpoons PCl_3+Cl_2$

Initial moles 0.65 0 0

At eqm. (0.65-x) x x

Moles of $PCl_3$ at equilibrium = x = 0.15 mole

Moles of $Cl_2$ at equilibrium = x = 0.15 mole

Moles of $PCl_5$ at equilibrium = (0.65-x) = (0.65-0.15) = 0.50 mole

Now we have to calculate the concentration of $PCl_3,Cl_2\text{ and }PCl_5$ at equilibrium.

Formula used : $Concentration=\frac{Moles}{Volume}$

$\text{Concentration of }PCl_3=\frac{\text{Moles of }PCl_3}{\text{Volume of solution}}=\frac{0.15mole}{1.0L}=0.15M$

$\text{Concentration of }Cl_2=\frac{\text{Moles of }Cl_2}{\text{Volume of solution}}=\frac{0.15mole}{1.0L}=0.15M$

$\text{Concentration of }PCl_5=\frac{\text{Moles of }PCl_5}{\text{Volume of solution}}=\frac{0.50mole}{1.0L}=0.50M$

Therefore, the equilibrium concentration of $PCl_5$ is, 0.50 M

8 0

4 years ago

Is coffee and water heterogeneous or homogeneous?

stepan [7]

Answer:

coffee is a homogeneous mixture while water is a heterogeneous mixture

5 0

4 years ago

Which of the following measurements would be different for the same object on the earth and on the moon?

Tema [17]

The gravity takes place in the objects

3 0

3 years ago