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3 years ago

Use the periodic table to answer the questions below.

Chemistry

2 answers:

MrRa [10]3 years ago

4 0

Answer:

Second option.

Explanation:

Nitrogen is the first element of group 15, and its number atomic is 7, so, in its neutral state, it has 7 electrons.

By Linus Pauling diagram (see figure), the electronic distribution will be:

$1s^{2} 2s^{2} 2p^{3}$

The distribution follows the arrows, from the less energetic subshell for the most energetic one. The subshell s has an only magnetic number, so only one orbital to put electrons. Subshell p has 3 magnetic numbers, so 3 orbitals to put electrons.

To put the electrons, we have to follow Hund's Rule: fulfill the orbitals which only one spin, until all orbitals have this spin, so continue, with the other spin, until finishing the electrons on that subshell. Spin is the rotation of the electron, and it can be +1/2 or -1/2.

So, for subshell 2p, how there are only 3 electrons, all three will be put with the same spin (+1/2, up arrow). If there was one more electron, it would be filled in the first orbital with the spin -1/2, down arrow.

Romashka-Z-Leto [24]3 years ago

3 0

B ............ is the answer,

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7 on the pH scale represents what?

Nitella [24]

Answer:

seven on the ph scale is the neutral point

Explanation:

The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

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2 years ago

Addition of dns at the end of the incubation period stopped the reaction by denaturing sucrase. explain why it is important to d

serious [3.7K]

Because sucrase will react with product and lower his concentration, so measurement of product concentration will not be accurate.
Sucrase activity is greater when sucrose concentration went from 2.5 to 7.5 g/l, because difference (increase) between two concentration (numbers) is greater.

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3 years ago

What determines the transition between different states of matter?

Scrat [10]

Answer:

Phase transition is when a substance changes from a solid, liquid, or gas state to a different state. Every element and substance can transition from one phase to another at a specific combination of temperature and pressure.

Explanation:

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3 years ago

Identify the type of sugar corresponding to each name. Sucrose Lactose Fructose Starch Glucose

hammer [34]

Answer: Please see answers in explanation column

Explanation:

Name Type of sugars

Sucrose Disaccharide

Sucrose, also called table sugar with molecular formulae C12H22O11 is a disaccharide composed of two monosaccharides ( 50%glucose + 50% fructose.).

Lactose Disaccharide

Lactose with molecular formula C12H22O11, found in milk is a disaccharide composed of two monosaccharides (galactose and glucose).

Fructose Monosaccharide

Fructose with molecular formulae C6H12O6 is a natural sugar mostly found in fruits.

Starch Polysaccharide

Starch ,a complex carbohydrate with molecular formula (C6H10O5)n, is a Polysaccharide containing many units of glucose joined together by 1,4 linkages. Sources of starch can be found in the parts of plants( roots, tubers etc).

Glucose monosaccharides

Glucose, is a simple sugar (monosaccharides) with the molecular formula C6H12O6. It is found in parts of plants as well as in humans and known as blood sugar because of its location in the bloodstream.

8 0

3 years ago

Rate Law & Reaction Kinetics Chemistry 11 Chapter 17 1. For the reaction 3 ClO - (aq) → ClO - 3(aq) + 2 Cl - (aq) doubling t

ryzh [129]

Answer:

1) Rate = K [ClO⁻]²

2) Rate = K [C6H5N2Cl]

3) - Double the concentration of H3PO4.

- Double the concentration of I⁻

4) Check Explanation

Explanation:

A reaction's rate law is written as a product of the reaction's rate constant, k, and the concentration of the respective reactant(s) raised to the power of the order of reaction.

The order of a reaction with respect to a reactant is the power that the concentration of that specific reactant has in the rate law. It shows how dependent on each reactant , the rate of the reaction.

1) 3ClO⁻ (aq) → ClO³⁻ (aq) + 2 Cl⁻ (aq)

Doubling the concentration of ClO⁻ quadruples the initial rate of formation of ClO³⁻. What is the rate expression for the reaction?

Rate = k [ClO⁻]ⁿ

When [ClO⁻] is doubled, Rate is quadrupled, this shows that the reaction is second order with respect to the only reactant.

Rate = K [ClO⁻]²

2. The reaction

C6H5N2Cl (aq) + H2O (l) → C6H5OH (aq) + N2 (g) + HCl (aq) is first order in C6H5N2Cl and zero order in H2O. What is the rate expression?

Normally, the rate of reaction is equal to the rate constant multiplied by the each reactant's concentration raised ti the power of the order, so,

Rate = K [C6H5N2Cl]¹ [H2O]

Rate = K [C6H5N2Cl]

3. For the reaction

H3PO4 (aq) + 3I⁻ (aq) + 2H + (aq) → H3PO3(aq) + I³⁻(aq) + H2O

(l) the rate expression under certain conditions is R = k[H3PO4][I⁻][H⁺]² . What method(s) could be used if you want to double the reaction rate?

Rate = k[H3PO4][I⁻][H⁺]²

Indicating a first order relationship between the rate and the concentration of H3PO4 & I⁻ and second order with respect to H⁺.

So, any attempt to double the rate of reaction will entail a direct doubling of the one of the reactants with a first order relationship with the rate of reaction.

4. What is the overall order of reaction for each of the following.

a) R = k[NO2]² b) R = k c) R = k[H2][Br2] ½ d) Rate = k[NO]² [O2]

Note that overall order of a reaction is the sum of all the orders of the reactants that appear in the rate law.

a) R = k[NO2]²

Overall order is obviously 2.

b) R = k

Overall order is evidently 0.

c) R = k [H2] [Br2]^ ½

Overall order = 1 + ½ = (3/2)

d) Rate = k[NO]2 [O2]

Overall order = 2 + 1 = 3

Hope this Helps!!!

7 0

3 years ago