CHEMISTRY HIGH SCHOOL

An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of(I ) 4- (3) 3+(2) 3- (4) 4+

Answers

Answer 1

Answer:

Answer : The correct option is 2.

Explanation :

Number of protons = 7

Number of neutrons = 6

Number of electrons = 10

Protons are those which carries positive charge.

Electrons are those which carries negative charge.

Neutrons are those which do not carry any charge that means neutrons are neutral.

The net charge on an ion = Number of protons present in an ion + Number of electrons present in an ion

The net charge on an ion = (+7) + (-10) = -3

Therefore, the net charge on an ion is (-3).

Answer 2

Answer: The answer is (2) 3-. The proton has one positive charge. Neutrons do not have charge. And electron has one negative charge. So the net charge is 3 negative charge.

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Which is an example of negative acceleration?

Answers

Answer:

When we throw a projectile up, the negative gravity acceleration acts on it. Thus, when the ball reaches the highest point, the speed of the ball becomes zero.

Explanation:

Acceleration is a vector magnitude that indicates the variation of speed per unit of time.

As displacement, velocity and acceleration are vectors we will analyze this vectorly.

We consider positive acceleration when the acceleration vector is directed in the same direction as the movement. (Acceleration)

On the other hand, we consider negative acceleration when the acceleration vector is directed in the opposite direction to the movement. (de-acceleration)

when the driver push the car's brake the acceleration decrease and become negative

a compound consists of 17.6% of hydrogen and 82.4% nitrogen. Determine the empirical formula of the compound

Answers

Answer: The empirical formula for the given compound is $NH_3$

Explanation:

We are given:

Percentage of H = 17.6 %

Percentage of N = 82.4 %

Let the mass of compound be 100 g. So, percentages given are taken as mass.

Mass of H = 17.6 g

Mass of N = 82.4 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Hydrogen = $\frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=(17.6g)/(1g/mole)=17.6moles$

Moles of Nitrogen = $\frac{\text{Given mass of nitrogen}}{\text{Molar mass of nitrogen}}=(82.4g)/(14g/mole)=5.88moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 5.88 moles.

For Hydrogen = $(17.6)/(5.88)=2.99\approx 3$

For Nitrogen = $(5.88)/(5.88)=1$

Step 3: Taking the mole ratio as their subscripts.

The ratio of H : N = 3 : 1

Hence, the empirical formula for the given compound is $NH_3$

17,6% + 82,6% = 100%

mass of N = 14g
mass of H = 1g

17,6% H = 17,6g H
82,4% N = 82,4g N

17,6g : 1g = 17,6 moles of H
82,4g : 14g = 5,89 moles of N

N : H = 5,89 : 17,6 ||:5,89
N : H = 1 : 2,99≈3

the empirical formula of the compound = NH₃ (ammonia)

Which equation represents a neutralization reaction? A. 4Fe(s) + 3O2(g) → 2Fe2O3(s) B. 2H2(g) + O2(g) → 2H2O() C. HNO3(aq) + KOH(aq) → KNO3(aq) + H2O() D. AgNO3(aq) + KCl(aq) → KNO3(aq) + AgCl(s)

Answers

Answer : The correct option is, (C)

Explanation :

A. $4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)$

This is synthesis reaction in which the two or more reactant react to give a single product.

B. $2H_2(g)+O_2(g)\rightarrow 2H_2O(l)$

This is combination reaction in which the two reactants combine to form a single product.

C. $HNO_3(aq)+KOH(aq)\rightarrow KNO_3(aq)+H_2O(l)$

This is a neutralization reaction in which an acid react with a base to give a salt and water as a product.

D. $AgNO_3(aq)+KCl(aq)\rightarrow KNO_3(aq)+AgCl(s)$

This is a double displacement reaction in which the positive cation and negative anion of two reactants exchange their places to give two new products.

Hence, the reaction (C) is a neutralization reaction.

The equation represents a neutralization reaction is HNO3(aq) + KOH(aq) → KNO3(aq) + H2O(). The answer is letter C. A. 4Fe(s) + 3O2(g) → 2Fe2O3(s), 2H2(g) + O2(g) → 2H2O() and AgNO3(aq) + KCl(aq) → KNO3(aq) + AgCl(s) are not neutralization reaction.

Which scientist provided a foundation for John Daltons work on the atomic structure

Answers

The correct option for above statement is:

B.Joseph Proust

Explanation:

Joseph Proust printed his Law of Definite Proportions (or Law of Constant Composition) in 1794. This law states that a compound consists of exact proportions of parts by mass no matter however the compound was created.

The scientist who provided a foundation for Dalton's work on the atomic structure is Ernest Rutherford

Do Sugar Crystals Grow Faster In Tap Water Or In Distilled Water?

Answers

Sugar crystals grow faster in Distilled water because tap water has iron, fluoride, and chlorine in it. Hope I answered your question! :)

If you have 100.0 grams of carbon and 100.0 grams or iron, which sample will contain more atoms

Answers

first you need to solve for the number of moles in each.
1 mole of anything = atomic mas of that element (g)

Carbon has an atomic mass of 12.0107
1 mole of Carbon = 12.0107 g

Iron has an atomic mass of 55.845
1 mole of Iron = 55.845 g

now convert each from grams to moles
(grams of Carbon cancel and you are left with moles of carbon)
100.0 g Carbon x 1 mol Carbon = 8.326 mol Carbon
12.0107 g Carbon

(grams of Iron will cancel and you are left with moles of iron)
100.0 g Iron x 1 mol Iron = 1.791 mol Iron
55.845 g Iron

now we can use avogadro's number to solve for the amount of atoms in each
1 mol = 6.02x10^23 atoms

8.326 mol Carbonx 6.02 x 10^23 atoms = 5.012 x 10^24 atoms Carbon
1 mol Carbon

1.791 mol Iron x 6.02 x 10^23 atoms = 1.078 x 10^24 atoms Iron
1 mol Iron

5.012 x 10^24 atoms Carbon > 1.078 x 10^24 atoms Iron

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