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2 years ago

What is the difference between mineral and non-mineral nutrients? provide an example of each.

1 answer:

Alex2 years ago

3 0

The difference between mineral and non-mineral nutrients is that one has minerals and the other doesn’t. For example, an apple and a table. An apple has nutrients, but a table doesn’t lol

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Isotopes: are atoms of different elements which have the same mass are atoms of the same element with equal numbers of neutrons

koban [17]

I can't understand your option because there is no full stop however

isotopes are 2 or more form of elements that contain equal number of proton but different number of neutron in their nuclei

4 0

3 years ago

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The temperature at which water condenses from a gaseous to a liquid form

MatroZZZ [7]

It condenses when it passes below 212 degrees Celsius, or 100 degrees Fahrenheit

8 0

3 years ago

Combustion reactions are exothermic. The heat of reaction for the combustion of 2-methylheptane, C8H18, is 1.306×103 kcal/mol. W

WARRIOR [948]

Answer:

11.45kcal/g

2.612 × 10³ kcal

Explanation:

When a compound burns (combustion) it produces carbon dioxide and water. The combustion of 2-methylheptane can be represented by the following balanced equation:

2 C₈H₁₈ + 25 O₂ ⇄ 16 CO₂ + 18 H₂O

It releases 1.306 × 10³ kcal every 1 mol of C₈H₁₈ that is burned.

<em>What is the heat of combustion for 2-methylheptane in kcal/gram?</em>

We know that the molar mass of C₈H₁₈ is 114.0g/mol. Then, using proportions:

$\frac{1.306 \times 10^{3}Kcal}{1mol} .\frac{1mol}{114.0g} =11.45kcal/g$

<em>How much heat will be given off if molar quantities of 2-methylheptane react according to the following equation? 2 C₈H₁₈ + 25 O₂ ⇄ 16 CO₂ + 18 H₂O</em>

In this equation we have 2 moles of C₈H₁₈. So,

$2mol \times\frac{1.306 \times 10^{3}kcal }{1mol} =2.612\times 10^{3}kcal$

3 0

3 years ago

What is the molar mass of Ca(CIO4)2

AleksAgata [21]

The molar mass of Ca(ClO4)2 is 239.1 g/mol.

8 0

3 years ago

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The shape (or geometry) of the amide anion, NH2-, the number of lone pairs on nitrogen, and the hybridization at nitrogen are, r

PtichkaEL [24]

Answer : The correct option is, (B) bent, 2, and $sp^3$

Explanation :

Formula used :

$\text{Number of electron pair}=\frac{1}{2}[V+N-C+A]$

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

The given molecule is, $NH_2^-$

$\text{Number of electrons}=\frac{1}{2}\times [5+2+1]=4$

Number of bond pair = 2

Number of lone pair = 2

The total number of electron pair are 4 that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

But as there are 2 atoms around the central oxygen atom, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent or angular.

Hence, the correct option is, (B) bent, 2, and $sp^3$

3 0

3 years ago