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3 years ago

Pls help! Will mark brainliest! 55 Points!

Chemistry

2 answers:

vlada-n [284]3 years ago

7 0

It is 7cm squared so just type 7

GenaCL600 [577]3 years ago

6 0

Answer:

7cm square is the answer

Hope it's helpful

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Which of the following atoms has the same number of neutrons as 9Be?

xxMikexx [17]

Answer: -

¹⁰B

Explanation: -

For ⁹Be,

The atomic number is 4.

The Mass number is 9.

The number of neutrons = mass number - atomic number

= 9 - 4 = 5

For ⁹B,

The atomic number is 5.

The Mass number is 9.

The number of neutrons = mass number - atomic number

= 9-5 = 4

For ¹⁰B,

The atomic number is 5.

The Mass number is 10.

The number of neutrons = mass number - atomic number

= 10-5 = 5

For ¹⁰Be,

TThe atomic number is 4.

The Mass number is 10.

The number of neutrons = mass number - atomic number

= 10-4 = 6

For ¹²C,

The atomic number is 6.

The Mass number is 12.

The number of neutrons = mass number - atomic number

= 12-6 = 6

4 0

4 years ago

This is to observe carefully and in detail so as to identify causes, key factors, or possible results

lesantik [10]

To analyze. Oml they won't let me add it unless I write more. Smh.

3 0

4 years ago

Read 2 more answers

Which statement best describes the way a catalyst works?

bogdanovich [222]

Answer: E. It decreases the value of Eact.

Explanation:

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and more molecules convert to products.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.

6 0

3 years ago

2Al(s)+Fe2O3(s)−→−heatAl2O3(s)+2Fe(l) 2Al(s)+Fe2O3(s)→heatAl2O3(s)+2Fe(l) If 26.1 kg Al26.1 kg Al reacts with an excess of Fe2O3

Dmitry_Shevchenko [17]

Answer : The mass of $Al_2O_3$ produced will be, 49.32 Kg

Explanation : Given,

Mass of $Al$ = 26.1 Kg = 26100 g

Molar mass of $Al$ = 26.98 g/mole

Molar mass of $Al_2O_3$ = 32 g/mole

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

$\text{Moles of }Al=\frac{\text{Mass of }Al}{\text{Molar mass of }Al}=\frac{26100g}{26.98g/mole}=967.38moles$

Now we have to calculate the moles of $Al_2O_3$ .

The balanced chemical reaction is,

$2Al+Fe_2O_3\rightarrow Heat+Al_2O_3+2Fe$

From the balanced reaction we conclude that

As, 2 moles of $Al$ react to give 1 mole of $Al_2O_3$

So, 967.38 moles of $Al$ react to give $\frac{967.38}{2}=483.69$ moles of $Al_2O_3$

Now we have to calculate the mass of $Al_2O_3$ .

$\text{Mass of }Al_2O_3=\text{Moles of }Al_2O_3\times \text{Molar mass of }Al_2O_3$

$\text{Mass of }Al_2O_3=(483.69mole)\times (101.96g/mole)=49317.0324g=49.32Kg$

Therefore, the mass of $Al_2O_3$ produced will be, 49.32 Kg

3 0

3 years ago

Convert 7.50 grams of glucose C6H12O6 to moles

Lera25 [3.4K]

Answer:

The number of mole is 0.04167mole

Explanation:

To convert gram to mole, we need to calculate the molecular weight of the compound

C6H12O6

C - 12

H - 1

O - 16

Molecular weight = 6 * 12 + 1 *12 + 6 * 16

= 72 + 12 + 96

= 180g/mol

To covert gram to mole

Therefore,

= 7.50g/ 180g/mol

= 0.04167 mole of glucose

3 0

3 years ago

Pls help! Will mark brainliest! 55 Points!​

Pls help! Will mark brainliest! 55 Points!