A + B = C + D + heat Which reactions are exothermic and which are endothermic? (forward and reverse)

Answers

Answer 1

Answer: The reaction is an exothermic one because heat is released to the surroundings. An exothermic reaction is a chemical reaction where energy is being released as the reaction by light or heat. On the other hand, endothermic reaction needs energy input for the reaction to proceed.

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Calculate the pH of an aqueous solution of 16 mL of 0.00046 M HClO4(aq) after dilution to 42 mL.

Answers

1000 $cm^(3)$ of HClO_{4} [/tex] contain 0.00046mol
16 $cm^(3)$ of HClO_{4} [/tex] contain x
x = $(16cm ^(3) * 0.00046mol)/(1000cm x^(3) )$
x = 0.00000736mol

$M_(1) V_(1) = M_(2) V_(2)$
(0.00000736mol)(16 $cm^(3)$ )= $(x) (42cm^(2))$
$x= ((0.00000736mol) * (16cm^(3)) )/(42cm^(3) )$
= 0.000002803mol

pH= -log [ $H^(+)$ ]
= -log (0.000002803cm $^(3)$
= 5.55

Which ion was fomed by providing the second ionization to remove an electron A) ca2+ B)N3- B)Fe3+ C)S2

Answers

The ion that is formed by providing the second ionization to remove an electron is N3-. The answer is letter B. The rest of the choices do not answer the question above.

Answer:

A.) CA2+

Explanation:

edge 2021

Which metallic properties are caused by atoms rolling over each other in metallic bonds?malleability and ductility
shininess and ductility
conductivity, malleability, and shininess
ductility, conductivity, and malleability

Answers

Answer: malleability and ductility

Explanation:-

Malleability is the property of metals to be beaten into sheets. Ductility is the property of metals to be drawn into wires.The delocalized sea of electrons enable the metal atoms to roll over each other when stress is applied and thus they can be converted to sheets or wires.

Shininess of metals is because electrons on the surface can bounce back light at the same frequency as the light hits the surface.

When a wire is connected to a metal, the delocalized electrons are drawn to the positive pole and thus helps in the conduction of electricity.

The metallic properties that are caused by atoms rolling over each other in metallic bonds are malleability and ductility.the atoms that are being rolled over are delocalized electrons in the sea of electrons in the metallic bond enable them to roll over when stress is applied.

If the following elements were to combine with each other, choose which demonstrate the Law of Multiple Proportion. Select all that apply. Z:X = 7:1 A:Z = 2.5:1 A:Z = 2.2:1 Y:X = 11:1

Answers

Answer is: Z:X = 7:1 and Y:X = 11:1.

Law of multiple proportions or Dalton's Law said that the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.
In this example ratios are whole numbers, A:Z = 2.5 : 1 and A:Z = 2.2 : 1 are not whole number ratios.

Answer:

7.1 and 11.1

Explanation:

Which is true about fossil fuels? A.
Coal and natural gas came from swamp environments, while oil came from open oceans.

B.
Coal came from swampy environments, while oil and natural gas came from open ocean environments.

C.
Coal, oil, and natural gas came from swamp environments.

D.
Natural gas and oil came from swamp environments, while coal came from open oceans.

Answers

Which is true about fossil fuels? The statement that is true about fossil fuels is Coal came from swampy environments, while oil and natural gas came from open ocean environments. The answer is letter B. The rest of the choices is not true for fossil fuel

The chemical process in which electrons are gained by an atom or an ion is called

Answers

Reduction is the process by which eletrons are gained by an atom.

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