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3 years ago

1.Nuclear charge decreases as the atomic number increases.Immersive Reader

Chemistry

1 answer:

astra-53 [7]3 years ago

6 0

1.Nuclear charge decreases as the atomic number increases.Immersive Reader

Answer - True

2.In alkali metals, the atomic radius of potassium is greater than

Answer - Lithium

3.While moving across the periodic table from left to right there is an increase in atomic radius.

Answer - False

4.When moving from gold to lead, the atomic radius increases.

Answer - True

5.The picometer is the unit used to measure atomic radii.

Answer - True

6.Which of the following is larger in atomic size?

Answer - Boron

7.Chlorine has a larger atomic radius than fluorine.

Answer - True

8.Atomic size increases across a period.

Answer - False

9.The atomic radius of a nitrogen atom is 70 pm. What is the distance between the nuclei of two bonded nitrogen atoms in a N2 molecule

Answer - 140 pm

10.Arrange the following atoms in order of decreasing atomic radius:

Ga, As, Sn, Sb, Te

Answer - a. Sn, Sb, Te, Ga, As

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Describe gas production

kaheart [24]

Answer:

it natural gas or fossil fuels

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3 years ago

An unknown element, X, reacts with oxygen to form two oxides with the general formula X_2O_3 and X_2O_5. The pure element is str

Gelneren [198K]

Answer:

The unknown element is Sb

Explanation:

The first thing we must note is that the unknown element must be a member of group 15 in the periodic table. This is clear from the fact that the two oxides formed are X2O3 and X2O5. This implies that the unknown element X must have a valency of 3 or 5. This corresponds to our knowledge that the outermost electron configuration of group 15 elements is ns2np3. Hence, group fifteen elements can have a valency of 3 or 5.

The electronic configuration of antimony is; [Kr]4d10 5s2 5p3. This implies that the atom is paramagnetic since there are three unpaired 5p electrons. The oxides of antimony are known to be amphoteric. An ampohoteric oxide reacts with both acid and base, hence the answer.

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3 years ago

Why is it important to know what temperature scale is being used in a given situation?

Arisa [49]

It depends, for example, it is quite important to know the Kelvin scale (i.e 0 degrees Celsius is 273 K and -273 degrees Celsius is 0 K ) when dealing gases. But I don't know other situations where you would need to know other temperature scales.

Hope this helps and also if you are using Fahrenheit 1 Fahrenheit is -17.22 degrees Celsius

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4 years ago

Despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided, you should be

navik [9.2K]

Answer:

G<0, spontanteous

H<0, from equation

S>0, gas to solid

Explanation:

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. Despite its name, silica gel is a solid. It is a chemically inert, highly porous, amorphous form of SiO2. Water vapor readily adsorbs onto the surface of silica gel, so it acts as a desiccant. Despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided, you should be able to make an educated guess about the thermodynamic characteristics of the process. Predict the signs of ΔG, ΔH, and ΔS.

G<0, spontanteous

H<0, from equation

S>0, gas to solid

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3 years ago

Which one of the following scenarios accurately describes a condition in which resonance can occur? A. A column of air has a hei

bixtya [17]

The correct answer from the choices is: D

Resonance is an event where an external force or vibration moves another system to oscillate with higher amplitude at certain frequences or there is a transfer of energy between two or more different storage modes.

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3 years ago