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4 years ago

What is point group of allene?

Chemistry

2 answers:

Ostrovityanka [42]4 years ago

6 0

D2d is the point group of allene

Fantom [35]4 years ago

4 0

Allene (1,2-propadiene) has point group D2d, itself is achiral because it has two planes of symmetry. ... An allene with substituents on one terminal carbon atom are unlike and substituent on other terminal carbon atoms are same, allene will be achiral. It will have one symmetry plane.

Hope this helped :)

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5 A snowball sits at the top of the hill. Which of the following changes will increase the kinetic energy of the snowball? A Add

ikadub [295]

Answer:

Explanation:

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5 0

3 years ago

Tracy and Eric are timing how fast marbles roll down an inclined plane . They plan to do this 5 times , and then take the averag

Sergio039 [100]

Answer:

The accuracy can be improved by making sure no external force is applied, i.e the marbles should accelerate under gravity only during each trial.

Explanation:

Accuracy is a term used to describe the relationship between a measured value to the real value. When a measured value is accurate, it implies that there is little or no error in the value; thus it is equal to the real value or very close to it.

Since this experiment is to determine the speed with which the marble roll down the plane, they should ensure uniform acceleration through out the trials. The marbles should be allowed to move under the influence of gravity only without applying any external force.

3 0

4 years ago

The gas usually filled in the electric bulb is? 1.nitrogen 2.hydrogen 3.carbon dioxide 4.oxygen

nlexa [21]

Argon and nitrogen are usually filled in an electric bulb, so one is your answer.

3 0

4 years ago

Please help!

adoni [48]

2. 15.65 grams of KCl is formed if 25.0 g of Potassium Chlorate, KClO3, decompose.

3. 2.17 moles of H2 gas produced when 100.0 grams of Na is added to the reaction.

4. 7.5 moles of Hydrogen, H2, are needed to react with 2.5 moles of Nitrogen, N2.

Explanation:

2. The balanced equation for the chemical reaction is:

2KClO3 ⇒ 2KCl + 3O2

Data given:

mass of KClO3 = 25 grams, atomic mass of KClO3 = 122.55 grams/mole

KCl produced =? atomic mass of KCl = 74.55

number of moles = $\frac{mass}{atomic mass of one mole}$

= $\frac{25}{122.55}$

number of moles = 0.20 moles of KCO3

2 moles of KClO3 decomposes to give 2KCl

0.21 moles of KClO3 decomposes to give x moles of KCl

$\frac{2}{2}$ = $\frac{x}{0.21}$

x = 0.21 moles of KCl

mass of KCl = 0.21 x 74.55

= 15.65 grams of KCl is formed.

3. data given:

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

mass of Na added = 100 grams, atomic mass of Na = 22.98 grams/mole

moles of H2 =?

Number of moles of Na = $\frac{mass}{atomic mass of one mole}$

= $\frac{100}{22.98}$

number of moles of Na = 4.35 moles

2 moles of Na gives 1 mole of H2

4.35 moles of Na will give x moles

$\frac{1}{2}$ = $\frac{x}{4.35}$

2x = 4.35

x = 2.17 moles of hydroden gas is produced.

4. Data given:

the balanced chemical equation:

N2 + 3H2 → 2NH3

Number of moles of N2 2.5

from the reaction

1 mole of N2 reacts with 3 moles of H2

The molar ratio of the reactant is 1:3

so, $\frac{1}{3}$ = $\frac{2.5}{x}$

x = 7.5 moles of H2 will react with 2.5 moles of N2.

7 0

3 years ago

Which ions aren't shown in net ionic reactions, because they are present as both reactants and products of the reaction, so they

Anvisha [2.4K]

Explanation:

This is correct!

Ions that exist in both the reactant and product side of the equation are referred to as spectator ions. Overall, they do not partake in the reaction. If they are present on both sides of the equation, you can cancel them out.

An example is;

Na+(aq) + Cl−(aq) + Ag+(aq) + NO3−(aq) → Na+(aq) + NO3−(aq) + AgCl(s)

The ions; Na+, NO3−(aq) would be cancelled out to give;

Cl−(aq) + Ag+(aq) → AgCl(s)

7 0

3 years ago

What is point group of allene?​

What is point group of allene?