HELP! How many grams of water are made from the reaction of 4.0 grams of hydrogen gas?

Answers

Answer 1
Answer: n H2 = mH2 / MH2
= 4.0g / 2gmol-1
= 2 mol
therefore n H2O = 1 mol

mH2O = nH2O * MH2O
= 1mol * 18 gmol-1
=18 g

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What is the bond character of this molecule? A.) strongly covalent
B.) Positively charged
C.) Strongly ionic
D.) Negatively charged

Answers

There are two types of atomic bonds - ionic bonds and covalent bonds. They differ in their structure and properties. Covalent bonds consist of pairs of electrons shared by two atoms, and bind the atoms in a fixed orientation. ... This results in a positively charged ion (cation) and negatively charged ion (anion)

Explain why HCl can be a strong electrolyte, but a dilute HCl solution can be a poor conductor?

Answers

Answer:

Because as the concentration is diminished, the capacity to transfer electricity is diminished as well.

Explanation:

Hello!

In this case, since electrolytes are substances that are able to conduct the electricity in aqueous media (solutions in which water is the the solvent) because they have the capacity to form ions with both positive and negative charges, due to the fact that HCl is a strong acid, we notice it is fully ionized in solution and therefore it is a strong electrolyte. However, when the concentration is diminished, we can notice that strength is diminished as well because less ions will have the capacity to transfer the electricity and therefore it'd become a poor conductor or weak electrolyte.

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Which of the following is true for all exergonic reactions? The reaction releases energy. A net input of energy from the surroundings is required for the reactions to proceed. The reactions are rapid. The products have more total energy than the reactants. The reaction goes only in a forward direction: all reactants will be converted to products, but no products will be converted to reactants.

Answers

Answer:

The reaction releases energy

Explanation:

The products of an exergonic reaction have a lower energy state (Delta-G) compared to the reactants. Therefore there is a negative delta –G between products and reactants after the reactions. This means some energy is lost into the environment usually through light or heat.

Final answer:

Exergonic reactions are characterized by a net release of energy but they still require a small initial energy input to start, referred to as the 'activation energy'. The speed or direction of the reaction is not determined by whether it's exergonic.

Explanation:

In the context of chemical reactions, the true statement for all exergonic reactions is that such reactions result in a net release of energy. However, even exergonic reactions, which are characterized by energy release, require a small initial input of energy to get started. This initial energy demand is referred to as the 'activation energy'. Also, it's important to note that the speed of the reaction or its directionality (whether it proceeds only in a forward direction) are not inherently determined by whether a reaction is exergonic. These aspects depend on other reaction conditions and catalysis.

Learn more about Exergonic Reactions here:

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Of the following, which element has the highest first ionization energy?Li
Cs
At
F​

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There are free tutor on my website just got to freetutor.com
I think it’s Li but I don’t totally know

270kJ are needed to keep a 75 watt light bulb burning for 1 hour. How many kilocalories are needed to burn this light bulb for 3 hours?

Answers

Answer:

For 1 hour 75w light bulb requires 270 kj  for burning

for 3 hours 75 w light bulb requires 270*3 = 810kj for burning

Explanation:

Answer True or False for each of the following statements. (a) The carburization surface was maintained at slightly less than 0.25 wt% carbon for each specimen. (b) Comparing the finished specimens at a depth of 0.20 mm, specimen A features the lowest carbon concentration. (c) Comparing the finished specimens as a whole, specimen D features the lowest overall amount of carbon.

Answers

Answer:

verdadero/a

falso/b

verdadero/c

Explanation: