All categories

3 years ago

Which of the following is an example of a physical change?

Chemistry

2 answers:

dangina [55]3 years ago

5 0

D it is only physical and not chemical

mars1129 [50]3 years ago

4 0

Answer:

Explanation:

Because a physical change is affecting the form of a chemical substance, not its chemical composition.

You might be interested in

What volume is occupied by 0.25 moles of nitrogen gas at 360 K and 1.50 atm

Annette [7]

It varies with container, temperature, pressure and amount of gas. But, the volume occupied by a gas at a fixed temperature and pressure remains constant which is 22.4 L for 1 mole at STP.

4 0

4 years ago

Question 4 (5 points)<br> Which parasite can live in refrigerated conditions?

Mumz [18]

Ticks can live in the winter

3 0

3 years ago

The solubility of lead(II) iodide is 0.064 g/100 mL at 20ºC. What is the solubility product for lead(II) iodide?

quester [9]

Answer:

$Ksp=1.07x10^{-8}$

Explanation:

Hello,

In this case, the dissociation reaction is:

$PbI_2(s)\rightleftharpoons Pb^{2+}(aq)+2I^-(aq)$

For which the equilibrium expression is:

$Ksp=[Pb^{2+}][I^-]^2$

Thus, since the saturated solution is 0.064g/100 mL at 20 °C we need to compute the molar solubility by using its molar mass (461.2 g/mol)

$Molar solubility=\frac{0.064g}{100mL}*\frac{1000mL}{1L}*\frac{1mol}{461.2g}=1.39x10^{-3}M$

In such a way, since the mole ratio between lead (II) iodide to lead (II) and iodide ions is 1:1 and 1:2 respectively, the concentration of each ion turns out:

$[Pb^{2+}]=1.39x10^{-3}M$

$[I^-]=1.39x10^{-3}M*2=2.78x10^{-3}M$

Thereby, the solubility product results:

$Ksp=(1.39x10^{-3}M)(2.78x10^{-3}M)^2\\\\Ksp=1.07x10^{-8}$

Regards.

6 0

4 years ago

Fe + CuCl2 → FeCl2 + Cu

inna [77]

Answer:

the type is single replacement

5 0

3 years ago

Compare and contrast the molecular activity of solids, liquids, and gases.

cupoosta [38]

Answer:

The molecules in a solid are close together and they vibrate in place. The molecules in a liquid move quickly and farther apart from eachother. The particles in a gas move freely at high speeds and slide past eachother.

5 0

3 years ago