Which one of the following statements about absolute zero is correct? (a) At absolute zero, the volume of an ideal gas is zero.
(b) At absolute zero, ideal gases freeze to give solids.
(c) At absolute zero, solid and liquid water are at equilibrium.
(d) Absolute zero is the lowest temperature so far reached in the laboratory

Answers

Answer 1

Answer: The statement labeled as (a) is the correct one on that list.

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Acetylene gas (C2H2) is produced as a result of the following reaction. CaC2 (s) + 2H20(I) -> C2H2(g) + Ca (OH)2 (aq) a. If 3.20 moles of CaC2 are consumed in this reaction, how many grams of H2O are needed? Given: Requested:

Answers

Answer:approximately 115.33 grams of H2O are needed to react with 3.20 moles of CaC2 in the given reaction.

Explanation:To determine how many grams of H2O are needed to react with 3.20 moles of CaC2 in the given reaction, we can use stoichiometry and the molar ratios between CaC2 and H2O in the balanced chemical equation.

First, let's write down the balanced chemical equation:

CaC2 (s) + 2H2O (l) -> C2H2 (g) + Ca(OH)2 (aq)

From the balanced equation, we can see that 1 mole of CaC2 reacts with 2 moles of H2O.

Now, let's use this information to calculate the moles of H2O required to react with 3.20 moles of CaC2:

Moles of H2O = (3.20 moles CaC2) * (2 moles H2O / 1 mole CaC2)

Moles of H2O = 3.20 moles * 2

Moles of H2O = 6.40 moles

Now that we know we need 6.40 moles of H2O, we can calculate the grams of H2O needed using the molar mass of H2O:

Molar mass of H2O = 2(1.01 g/mol) + 16.00 g/mol = 2.02 g/mol + 16.00 g/mol = 18.02 g/mol

Now, calculate the grams of H2O:

Grams of H2O = (6.40 moles) * (18.02 g/mol)

Grams of H2O ≈ 115.33 grams

So, approximately 115.33 grams of H2O are needed to react with 3.20 moles of CaC2 in the given reaction.

Which statement best explains the role of acatalyst in a chemical reaction?
(1) A catalyst is added as an additional reactant
and is consumed but not regenerated.
(2) A catalyst limits the amount of reactants used.
(3) A catalyst changes the kinds of products produced.
(4) A catalyst provides an alternate reaction pathway
that requires less activation energy.

Answers

The answer is (4). If you look at a Maxwell-Boltzmann energy curve, you will see that lowering the activation energy will increase the proportion of molecules with sufficient energy for a successful reaction collision. Therefore, a reaction with lower activation energy will proceed more quickly. Often, this lower activation energy is obtained by another mechanistic pathway. Catalysts increase reaction speed through these two basic mechanisms.

Any temperature on the Kelvin scale can be changed to Celsius degrees bya. subtracting 100 from it.
b. adding 212 to it.
c. subtracting 273 from it.
d. subtracting 32 from it.

Answers

c. subtracting 273 from it.

C. Subtract 273 from it

Which scientist is credited with developing the first scientific atomic theory?

Answers

Answer:

John Dalton

Explanation:

John Dalton was the first scientist to give the atomic theory. According to Dalton:

All substance is made up of atoms and atoms are indivisible.
All atoms of an element have the same mass.
A compound is formed by the combination of different atoms from different elements.
A chemical reaction is the rearrangement of atoms.

Dalton was the first scientist to create an atomic theory but he wasn't given any credit. J.J Thompson was credited for his theory (apple pudding)

Carbon has four valence electrons, and chlorine has seven valence electrons. If carbon covalently bonds with chorine, which of the following would represent the Lewis dot (electron dot) structure?

Answers

Answer: The correct answer is Image 3.

Explanation:

Lewis dot structure is defined as the structure which represents the number of valence electrons around the atom. The electrons are represented as dots.

From the structure, we can easily determine the number of bonding and non-bonding electrons. Non-bonding electrons are considered as lone pair of electrons.

Carbon is the 6th element of the periodic table having electronic configuration of $1s^22s^22p^2$

This element has 4 valence electrons.

Chlorine is the 17th element of the periodic table having electronic configuration of $1s^22s^22p^63s^23p^5$

This element has 7 valence electrons.

The lewis dot structure for the compound $CCl_4$ is given below in the image attached.

Hence, the correct answer is Image 3.

1. It is wrong because each chlorine atom should have 3 lone pairs
2. It is wrong because carbon only has four valence electrons
3. It is correct because each chlorine has 3 lone pairs and carbon has 4 electrons covalently bonded with chlorine
4. It is wrong because chlorine only has 7 valence electrons and therefore it cannot have 3 lone pairs and 2 bond pairs for each of C-Cl bonds

The distance from santa maria to los alamos is 16.25 mi. What is the distance in cm?

Answers

Final answer:

The distance from Santa Maria to Los Alamos, which is 16.25 miles, would be approximately 2615178.4 centimeters when converted using the conversion factor of 1 mile = 160934.4 cm.

Explanation:

In order to convert the distance from miles to centimeters, you need to use conversion factors. We know that 1 mile is equivalent to approximately 160934.4 centimeters. Therefore, to find the distance from Santa Maria to Los Alamos in centimeters, you would multiply the number of miles by the number of centimeters in a mile.

The calculation would look like this:

16.25 miles * 160934.4 cm/mile = 2615178.4 cm

So, the distance between Santa Maria and Los Alamos is approximately 2615178.4 centimeters.

Learn more about Distance Conversion here:

brainly.com/question/14928456

#SPJ2

16.25 miles = 2615184 centimeters

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