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3 years ago

Which of the following is NOT an example of a physical change? *

Chemistry

1 answer:

Oksana_A [137]3 years ago

8 0

Answer:

burning paper

Explanation:

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Assoli18 [71]

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3 years ago

Me without you is like a nerd without braces, A shoe without laces, aSentenceWithoutSpaces.

Nataly [62]

Answer:

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Explanation:

3 0

3 years ago

A student performs a reaction that makes aluminum oxide. According to her calculations, she should expect to make 115.2 grams. S

tiny-mole [99]

Answer:

The percentage of the student is 58.17%.

Explanation:

Expected yield of aluminum oxide = 115.2 g

Actual yield of aluminum oxide produced =66.9 g

The percentage yield is calculated by dividing actual yield by expected yield and then multiplying it with hundred.

Percentage yield:

$\frac{\text{Actual yield}}{\text{Expected yield}}\times 100$

$\% Yield=\frac{66.9 g}{115.2 g}\times 100=58.17\%$

The percentage of the student is 58.17%.

7 0

3 years ago

You have 0.21 moles of Al how many atoms do you have

ZanzabumX [31]

Number of atoms : 1.26 x 10²³

<h3>Further explanation </h3>

The mole is the number of particles(molecules, atoms, ions) contained in a substance

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

0.21 moles of Al, so n = 0.21

Number of atoms :

$\tt N=0.21\times 6.02\times 10^{23}\\\\N=1.26\times 10^{23}$

8 0

2 years ago

Consider the following hypothetical molecular collisions and predict which of the following will form potential products, given

Annette [7]

Answer:

The collision theory is defined as the rate of a reaction is proportional to the rate of reactant collisions.

Explanation:

The reacting species should collide with orientation that allows contract between the atoms that will become bonds together in the product.

The collision occurs with adequate energy to permit mutual penetration of the reacting species. The two physical factors based on the orientation and energy of collision, the following reaction with carbon monoxide with oxygen is considered.

2CO(g) + O2(g) → 2CO2 (g)

After collision between the carbon monoxide and oxygen the reaction is

CO(g) + O2(g) → CO2 (g) + O(g)

Based on the theories of chemical reaction the molecules collide with sufficient amount of energy an activated complex is formed.

7 0

3 years ago