Looking at the periodic table, which of these elements has the smallest atomic radius?A. sodium
B. potassium
C. hydrogen
D. lithium

Answers

Answer 1

Answer:

Answer: C. hydrogen

Explanation:

Atomic radius of an atom is defined as the total distance from the nucleus to the outermost orbital of electron.

On moving from top to bottom, there is an addition of shell around the nucleus and the outermost orbital gets far away from the nucleus and hence, the distance between the nucleus and outermost orbital increases.

This in turn increases the atomic radii of the element from moving top to bottom in a group.

$H:1:1s^1$

$Li:3:1s^22s^1$

$Na:11:1s^22s^22p^63s^1$

$K:19:1s^22s^22p^63s^23p^64s^1$

Answer 2

Answer: hydrogen which has 0.79

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Why does water with salt in it freeze much more slower than water without it ? Explain

Answers

When you add salt to water, you lower to freezing point of the substance.

So for example, normal water freezes at 0°C. But water with salt in it won't freeze at 0°C, because its freezing point is lowered.

In answer to the question. It takes longer for water with salt in it to freeze because the substance requires a lower temperature than normal water to freeze.

The more salt in the water, the lower the freezing point will be. When freshwaterfreezes, water molecules of hydrogen and oxygen have bonded together into a crystalline structure of ice. The presence of salt makes it harder for water molecules to bond to the ice structure, because ice naturally repels salt molecules.

If a mole of hydrogen reacts with a mole of oxygen to produce water, what is the excess reactant?

Answers

Answer:

Oxygen is the excess reactant.

Explanation: A simple balanced chemical equation for the production of water, will show:

2H2 + O2 -----> 2H20

2 : 1 2

From this, we can see that 2 moles H2 react with 1 mole of O2 to produce 2 moles of H2O. That is to say, hydrogen reacts with oxygen in the ratio 2:1

Also if 1 mole of H2 is needed to produce water, it will require 1/2 mole of O2 to react with.

Since we know this, we can tell from our question that 1 mole of H2 will react with 1/2 mole of O2 and be left with 1/2 mole of O2 as excess.

We can have a chemical equation for this as:

1/2H2 + O1/2 ------> 1/2H2O

1 : 1/2

Therefore, the H2 can be said to be the limiting reactant (gets consumed when the reaction is completed) while the oxygen is the excess reactant.

Answer:

there is no excess

Explanation:

Standard reduction potentials are based on which element?A.
helium
B.
hydrogen
C.
lithium
D.
oxygen
E.
zinc

Answers

Answer: option B. Hydrogen

Explanation:

What is this section of the periodic table called

Answers

Answer:

Noble Gases

Explanation:

They all have complete outer shells. They're also on column 18 :)

Which system consists of nerves that initiate communication?

Answers

Peripheral nervous system consists of nerves that help in communication among different parts of the body. In nervous system nerves are used to take and deliver messages. These messages are taken from different parts of the body to brain and these nerves are spreading all over the body.

The main actor in the neurological system's action is the nerve cell, or neuron. It transmits information chemically and electronically. Information is transferred within the neuron through the movement of an electrical charge, or impulse. It is the peripheral nervous system that initiates communication.

The nerves that emerge from the brain and spinal cord make up the peripheral nervous system. The CNS and the body components are connected through a network of nerves. All of the body's parts are connected by nerves that emerge from the spinal cord and make up the peripheral nervous system.

The PNS's primary functions are voluntary actions including eating, walking, and making facial expressions.

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If the pH of a solution is 5.3, what is the pOH?
A.5.3
B.4.7
C.8.7
D.9.3

Answers

The correct answer is C) 8.7

What does pH answer mean?

The pH of a solution indicates the acidity or basicity of the answer. A solution is said to be neutral if the pH is 7, if the pH fee is less than 7 then it is acidic in nature and if the pH cost is greater than 7 then the solution is simple in nature.

What does pH stand for?

Ph may appear as it belongs at the periodic desk of factors, however, it's truly a unit of size. The abbreviation pH stands for ability hydrogen, and it tells us how an awful lot hydrogen is in drinks—and the way active the hydrogen ion is.

What's the pH of a solution?

PH is a measure of the attention of H+(aq) ions in an answer. The attention of H+ ions may be stated in mol dm(-three), but the use of the log(10) feature simplifies the numbers concerned. Definition: pH is the terrible logarithm to base 10 of the hydrogen ion awareness in an aqueous solution.

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