1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zloy xaker [14]
4 years ago
10

22. Which one of the following processes has a negative value for AH°?

Chemistry
1 answer:
ss7ja [257]4 years ago
4 0

Answer:

C

Explanation:

A negative deltaH means that the reaction has to give up heat in order to happen. You have to treat deltaH as a reactant. So the question is do you need to add heat to the reactants to make the products. If you do, deltaH is plus.

Heat is required to make a solid go to a gas. deltaH is plus. A is not the answer.

A lot of heat is required for B (something like 400 Kj / mole. Like A, deltaH is plus and B is not the answer.

C: The liquid has to give up heat in order for the this reaction to take place. C is the answer.

D requires heat. It is not the answer.

You might be interested in
What is transculent object​
Levart [38]

Answer:

Translucent objects allow some light to travel through them

Explanation:

Materials like frosted glass and some plastics are called translucent. When light strikes translucent materials, only some of the light passes through them

3 0
3 years ago
The filling of which orbital is represented by the transition metals in period 4?
Sindrei [870]

Answer: 3d

Explantion:

1) Period 4 contains the elements with atomic numbers 19 through 36.

2) The elements with atomic numbers 19 (K) and 20 (Ca) fill the orbital 4s.

3) After that, as Aufbau's rule may help you to remember, the energy of the orbitals 3d is lower than the energy of the orbtitals 4p. So, the element 21 (Sc) start fillind the orbital 3d.

There are ten 3d orbitals, so the elements 21 through 30 fill the 3d orbitals.

Those elements, called transition metals are: Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn.

When the 3d orbitals are full, the next elements in the same period 4, fill the six 4p orbitals.

3 0
3 years ago
Read 2 more answers
Liquid hydrogen boils at -252°C. What is the boiling point on the Kelvin scale?​
DaniilM [7]

Answer:

Boiling point in kelvin is 373.1 \

boiling point of liquid hydrogen in kelvin is 21.15

Explanation:

5 0
3 years ago
La predicción de las propiedades de un elemento en función de la posición que ocupa en el sistema periódico es una
Ad libitum [116K]

Answer:

Los elementos de la tabla periódica se distribuyen sobre la base de similitudes.

Explicación:

Los diferentes tipos de elementos se distribuyen en 8 grupos de tabla periódica en función de sus propiedades. Los elementos que tienen propiedades similares se colocan en el mismo grupo. Por ejemplo, el primer grupo de la tabla periódica son los metales alcalinos. Todos los metales alcalinos tienen algunas propiedades similares, es decir, un electrón en su capa más externa, alta reactividad y forma metálica, mientras que, por otro lado, los ocho elementos del grupo son gases nobles que tienen una capa más externa completa y no tienen reactividad.

3 0
3 years ago
Select the correct answer. Why is it important to include recovery time in a workout program? A. It prevents you from getting bo
Bingel [31]

Answer:

C) It allows your body time to rest.

Explanation:

Hope this helps!

4 0
3 years ago
Read 2 more answers
Other questions:
  • An Erlenmeyer flask containing 20.0 mL of sulfuric acid of an unknown concentration was titrated with exactly 15.0 mL of 0.25 M
    12·1 answer
  • Based on this reaction, find how many moles of co can be obtained starting with 7 mol ch4?
    5·2 answers
  • Early life arose in an oxygen-free environment, but if any of these microbes had somehow come in contact with oxygen, the most l
    9·1 answer
  • The molecular weight of carbon dioxide, CO2, is 44.00 amu, and the molecular weight of nitrous dioxide, NO2, is 46.01
    5·2 answers
  • Prepare a 0.50 L of a 1.0 M solution of potassium sulfate. Determine the amount of potassium sulfate needed in correct significa
    8·1 answer
  • Explain with examples following characteristics of chemical reactions: a. Change of colour b. Evolution of gas c. Change of smel
    12·1 answer
  • Cell membrane? (plz help)!!
    7·1 answer
  • For the reaction represented by the equation 2h+O2– 2H2O, how may grams of water are produced from 6.00 mol of hydrogen?
    9·1 answer
  • The three most common states of matter on Earth are solids,blank
    11·1 answer
  • What are some characteristics of organic and inorganic compounds?
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!