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Levart [38]
3 years ago
10

1. Which two groups of elements in the periodic table are the most reactive?(1 point) A) alkali metals and halogens B) alkaline

earth metals and halogens C)halogens and noble gases D)noble gases and alkali metals 2. Use the periodic table to answer the question. Which statement about nitrogen (N) and phosphorus (P) is correct? (1 point) A)They have the same number of valence electrons. B)They have the same number of electron shells. C)They are both classified as halogens. D)They are both inert. 3. Which property do transition metals have in common?(1 point) A)They usually have low densities. B)They are usually very soft. C)They are usually very reactive. D)They usually have high melting points. 4. Neon and argon are both in Group 18 of the periodic table. Which property do they most likely share?(1 point) A)low or no reactivity B)silver color C)strong odor D)metallic texture 5. A scientist studies an element that has seven electrons in its outer shell, is fairly toxic, and is highly reactive. To which group of the periodic table does this element belong?(1 point) A) 17 B) 1 C) 18 D) 2 PLEASEE HELP I NEED IT DONE BY TMR
Chemistry
1 answer:
tatyana61 [14]3 years ago
4 0

Answer:

Explanation:

1) alkali metals and halogens as alkalis have 1 electron they need to get rid of in order to gain a full outer shell of electrons and the halogens have to gain 1 electron.

2) they have the same number of electrons on the outer shells

3)they usually have high melting points

4) low or no reactivity

5) group 7

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a solution of unknown molecular substance is prepared by dissolving 0.50g of the unknown in 8.0g of benzene. the solution freeze
spayn [35]

Answer:

THE MOLAR MASS OF THE UNKNOWN MOLECULAR SUBSTANCE IS 200 G/MOL.

Explanation:

Mass of the unknown substance = 0.50 g

Freezing point of the solution = 3.9 °C

Freezing point of pure benzene = 5.5 °C

Freezing point dissociation constant Kf = 5.12°C/m

First, calculate the temperature difference between the freezing point of pure benzene and the final solution freezing point.

Change in temperature = 5.5 -3.9 = 1.6 °C

Next is to calculate the number of moles or molarity of the compound that dissolved.

Using the formula:

Δt = i Kf m

Assume i = 1

So,

1.6 °C = 1 * 5.12 * x/ 0.005 kg of benzene

x = 1.6 * 0.008 / 5.12

x = 0.0128 / 5.12

x = 0.0025 moles.

Next is to calculate the molar mass using the formula, molarity = mass / molar mass

Molar mass = mass / molarity

Molar mass = 0.50 g /0.0025

Molar mass = 200 g/mol

Hence, the molar mass of the unknown compound is 200 g/mol

6 0
2 years ago
Which of the following species cannot act as a Lewis base?
gayaneshka [121]

Answer:

NH4+

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Answer:

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The degree of ionization of the different functional groups is in relation to the pH of the medium in which they are found, since the H3O + and OH- species are part of the equilibrium situation. Therefore, according to the pH, each group with characteristics of weak acid or base present in the molecule will be ionized to a lesser or greater extent. There are extreme situations where the balance has been totally displaced in one direction, for example: under very high pH conditions (low concentration of H3O +) weak acids are considered fully ionized, so the functional group will always have an electric charge. The same goes for the bases at very low pH values. In other equilibrium situations, species of the same molecule with different load will coexist in the solution, due to the pH value of the medium in which it is found.

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