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3 years ago

Which one of the following statements is not correct?

Chemistry

1 answer:

sweet [91]3 years ago

7 0

Answer:

option a, During allotropic transformation, the number of atoms in the material changes.

Explanation:

Allotrops are different crystalline forms of the same element. So, two allotrops of an element have same number of atoms.

for example diamond, graphite, graphene, fullerene are allotropic forms of carbon.

Allpotops differ in physical and chemical properties. So, volume changes during alloptropic transformation. So, statement b is correct.

Allotropic transformation is the transformation of one allotropic form to other therefore, number of atom does not change during allotropic transformation.

Chemical species having same atomic number or same no. of protons are called isotopes. so statement c is correct.

When an electron is added to the neutral element, electronic repulsion increases which lead to the increase in atomic size, So, statement d is also correct.

So among given, option a is incorrect

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please hurry! If 3.87g of powdered aluminum oxide is placed in a container containing 5.67g of water, what is the limiting react

VikaD [51]

Answer:

Explanation:

Given parameters:

Mass of aluminium oxide = 3.87g

Mass of water = 5.67g

Unknown:

Limiting reactant = ?

Solution:

The limiting reactant is the reactant in short supply in a chemical reaction. We need to first write the chemical equation and convert the masses given to the number of moles.

Using the number of moles, we can ascertain the limiting reactants;

Al₂O₃ + 3H₂O → 2Al(OH)₃

Number of moles;

Number of moles = $\frac{mass}{molar mass}$

molar mass of Al₂O₃ = (2x27) + 3(16) = 102g/mole

number of moles = $\frac{3.87}{102}$ = 0.04mole

molar mass of H₂O = 2(1) + 16 = 18g/mole

number of moles = $\frac{5.67}{18}$ = 0.32mole

From the reaction equation;

1 mole of Al₂O₃ reacted with 3 moles of H₂O

0.04 mole of Al₂O₃ will react with 3 x 0.04 mole = 0.12 mole of H₂O

But we were given 0.32 mole of H₂O and this is in excess of amount required.

This shows that Al₂O₃ is the limiting reactant

6 0

3 years ago

Am i the only one getting a red text saying my question is mean?

Triss [41]

Answer:

I dont know

Explanation:

8 0

3 years ago

In each of the following blanks, only enter a numerical value.

tatiyna

Answer:

1) 1,... 2

2) 18

3) n= 3 and I=1

Explanation:

1) when l= 0, its an s-sub-level, and only 1 orbital is possible which can carry only 2-electrons

2) the maximum number of electron is given by 2n^2= 2×3^2= 18

3) in 3p, the coefficient of p is the value of n= 3 and l-value of P is 1

5 0

3 years ago

What do a mole of magnesium (Mg) and a mole of iron (Fe) have in common?

azamat

What they have in common is that they both have the same number of atoms.

9 0

3 years ago

Which energy source from a reservoir would provide affordable, abundant electricity for a factory? solar panels wind turbines ga

Sunny_sXe [5.5K]

The energy source from a reservoir would provide affordable, abundant electricity for a factory is a hydroelectric power plant; option D.

<h3>What is energy?</h3>

Energy is the ability to do work.

Energy generating plants may either use wind, water or solar energy to produce electrical energy.

The most abundant source of energy from a reservoir is hydroelectric power plant.

Therefore, the energy source from a reservoir would provide affordable, abundant electricity for a factory is a hydroelectric power plant.

In conclusion, hydroelectric power plants are reservoirs of abundant energy supply.

Learn more about hydroelectric power plants at: brainly.com/question/3406557

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7 0

2 years ago