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4 years ago

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Chemistry

2 answers:

Arada [10]4 years ago

4 0

Answer:there are 4factors that play a role in creating ocean waves

1 wind 2speed 3 duration, and fetch those are the factors that play a role in

creating ocean wave

Explanation:

emmasim [6.3K]4 years ago

3 0

The answer is B i took teh test

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Calculate the amount of heat released in the combustion of 10.5 grams of Al with 3 grams of O2 to form Al2O3(s) at 25°C and 1 at

ElenaW [278]

Answer : The amount of heat released in the combustion is, 209.5 kJ

Explanation :

First we have to calculate the moles of Al and $O_2$ .

$\text{ Moles of }Al=\frac{\text{ Mass of }Al}{\text{ Molar mass of }Al}=\frac{10.5g}{27g/mole}=0.389moles$

$\text{ Moles of }O_2=\frac{\text{ Mass of }O_2}{\text{ Molar mass of }O_2}=\frac{3g}{32g/mole}=0.188moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction will be:

$4Al+3O_2\rightarrow 2Al_2O_3$

From the balanced reaction we conclude that

As, 3 mole of $O_2$ react with 4 mole of $Al$

So, 0.188 moles of $O_2$ react with $\frac{4}{3}\times 0.188=0.251$ moles of $Al$

From this we conclude that, $Al$ is an excess reagent because the given moles are greater than the required moles and $O_2$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of $Al_2O_3$

From the reaction, we conclude that

As, 3 mole of $O_2$ react to give 2 mole of $Al_2O_3$

So, 0.188 moles of $O_2$ react to give $\frac{2}{3}\times 0.188=0.125$ moles of $Al_2O_3$

Now we have to calculate the amount of heat released in the combustion.

As, 1 mole of $Al_2O_3$ releases amount of heat = 1676 kJ

So, 0.125 mole of $Al_2O_3$ releases amount of heat = $0.125\times 1676kJ=209.5kJ$

Thus, the amount of heat released in the combustion is, 209.5 kJ

4 0

3 years ago

Students are completing a table about a particular subatomic particle that helps make up an atom.

defon

Answer: option B.with “Inside the nucleus,” because the particle is a neutron.

Explanation:

You have to complete this table:

mass | location | charge

1 ? Has no charge

The atom is constituted by 3 subatomic particles, namely electron, proton, and neutron.

Since the gold foil experiment performed by Geiger and Marsden (1909), who collaborated with Ernest Rutherford, it was stablished that the atom contains a dense positively charged nucleus, which has almost all the mass of the atom.

The positive charge comes from the subatomic particle named proton.

A few time later, a second subatomic particle inside the nucleus, was discovered. This particle has not charge and has almost the same mass than the proton. Because the absence of charge it was named neutron.

Hence, the relative masses of the protons and neutrons are 1 / 1. As said, both are in the nucleus, and while the proton has positive charge, the neutron has no charge. So, the table is completed with inside the nucleus, because the particle is a neutron:

mass | location | charge

1 inside the nucleus Has no charge

5 0

3 years ago

Read 2 more answers

A lone pair must reside in which orbital type(s) to participate in resonance/conjugation/delocalization?

tino4ka555 [31]

If a lone pair is participating in resonance, this capability the atom is both Sp2 or Sp hybridized. Looking at the Sp2 case, that ability there are 3 Sp2 orbitals and one P orbital. Assuming there is no formal cost on the atom, the three hybrid orbitals are used for bonding and the lone P-orbital holds the lone pair. Sp3 orbitals are no longer involved with resonance so the lone pair worried in resonance should never be in an Sp3 orbital.

A mathematically described area round a nucleus in an atom or molecule that may also include zero, one, or two electrons Electrons organize themselves in cloudlike areas round the nucleus referred to as orbitals.

Learn more about orbitals here:

brainly.com/question/18914648

#SPJ4

5 0

2 years ago

Select the word or phrase that best completes each of the following sentences.

harina [27]

Answer:

1. Cells

2. Molecules

3. Organ

3 0

3 years ago

Read 2 more answers

Which statement about the energy of a phase change is true?

lara [203]

The answer is letter B. Melting is an endothermic change, because ice absorbs energy from its surroundings as it melts. The melting process absorbs heat energy that causes the ice to melt. Endothermic change is when it absorbs energy from its surrounding. The other choices are incorrect because exothermic change releases energy to its surrounding.

3 0

4 years ago