Stuck on question 22

What does the -40, -42, -43, -44, -46,-48 mean for each isotope of Calcium?

neonofarm [45]

Mass number of calcium isotopes

mass numberi the number of proton + neutron

number of proton for calcium is 20 regardless of isotopes

hence the only difference between calcium isotopes are rhe number of neutron

6 0

3 years ago

Why is the reaction SO2 + H2O → H2SO2 not balanced?

aalyn [17]

There are more oxygen atoms in the reactants while there are less oxygen atoms in the product.

Both sides of the equation is supposed to be balanced for a balanced equation. If any one of them isn't balanced, the equation remains unbalanced.

The main reason why the reaction above can not be balanced is:

This chemical reaction SO2 + H2O -> H2SO2 is not correctly written.

It must be: SO2 + H2O -> H2SO3

<em>hope this helps....</em>

5 0

3 years ago

Which outcome occurs when bonds between atoms are broken or formed? A. a physical change B. an element increasing in size C. a c

snow_tiger [21]

The answer is C. Chemical change.

5 0

3 years ago

Read 2 more answers

How wouldo I do research on which cup would keep a hot drink warmer

marshall27 [118]

ccording to Michigan State University, heat is created when molecules in the liquid move in different directions and bang into one another. These fast moving particles hit the side of the container where they are located. Heat conduction causes the heat from the liquid to be transferred to the container. The container gets hotter while the liquid gets colder. The liquid also loses heat as the surface area is exposed to air. The air gets heated while the container and the cup cool down.

A thermos container keeps liquids hot because the tight lid prevents heat from escaping the container. The core of the thermos is also filled with insulation, which does not conduct heat as well, so the liquid inside the cup does not cool down as quickly. Most thermos containers also feature reflective exteriors that limit the heat lost to radiation. A Styrofoam cup is made up of 95 percent air. This air conducts heat, which draws the warmth from the liquid into the cu

4 0

4 years ago

The Haber Process is the main industrial procedure to produce ammonia. The reaction combines nitrogen from air with hydrogen mai

Firdavs [7]

Answer:

A) $N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)$ .

B) $Kc=0.0933$ .

C) 0.9 mol.

D) Increasing both temperature and pressure.

Explanation:

Hello,

In this case, given the information, we proceed as follows:

A)

$N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)$

B) For the calculation of Kc, we rate the equilibrium expression:

$Kc=\frac{[NH_3]^2}{[N_2][H_2]^3}$

Next, since at equilibrium the concentration of ammonia is 0.6 M (0.9 mol in 1.5 dm³ or L), in terms of the reaction extent $x$ , we have:

$[NH_3]=0.6M=2*x$

$x=\frac{0.6M}{2}=0.3M$

Next, the concentrations of nitrogen and hydrogen at equilibrium are:

$[N_2]=\frac{1.5mol}{1.5L}-x=1M-0.3M=0.7M$

$[H_2]=\frac{4mol}{1.5L}-3*x=2.67M-0.9M=1.77M$

Therefore, the equilibrium constant is:

$Kc=\frac{(0.6M)^2}{(0.7M)*(1.77M)^3}\\ \\Kc=0.0933$

C) In this case, the equilibrium yield of ammonia is clearly 0.9 mol since is the yielded amount once equilibrium is established.

D) Here, since the reaction is endothermic (positive enthalpy change), one way to increase the yield of ammonia is increasing the temperature since heat is reactant for endothermic reactions. Moreover, since this reaction has less moles at the products, another way to increase the yield is increasing the pressure since when pressure is increased the side with fewer moles is favored.

Best regards.

7 0

3 years ago