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3 years ago

Which statement describes an element?

Chemistry

1 answer:

Anit [1.1K]3 years ago

5 0

Elements are substance that can not be broken down into simpler substance by ordinary chemical process

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The vertical columns on the periodic table are called groups, how many groups are there on the periodic table?

Kitty [74]

8 groups, 1 to 7 and most people call group 8 group 0 because the noble gases in group 0 have the outer electron shell full, so for example argon has 18 electrons, so it’s structure is 2.8.8 with its outer shell full. Also the number of the last shell defies what group it’s in, for example sodium is in group 1 so it’s structure is 2.8.1. Hope this helps.

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4 years ago

How many atoms in the pictured molecule can form hydrogen bonds with water molecules?

ddd [48]

Answer:

3

Explanation:

Please, find the image with the pictured molecule for this question attached.

The molecule has one oxygen atom (red) covalently bonded to one hydrogen atom (light grey), one nitrogen atom (blue) covalently bonded to two hydrogen atoms (light grey), and two carbon atoms (dark grey) bonded each to two hydrogen atoms (light grey).

Hydrogen bondings are intermolecular bonds (bonds between atoms of two different molecules not between atoms of the same molecule). The hydrogen bonds are attractions between the positive end of one hydrogen atom and the negative end of a small atom of other molecule (N, O, or F).

Since, nitrogen and oxygen are much more electronegative than hydrogen atoms, you conclude that:

The two hydrogen atoms covalently bonded to the nitrogen atoms have considerably partial positive charge.

The hydrogen atom covalently bonded to the oxygen atom also has a a relative large partial positive charge.

So, those are three ends of the molecule that can form hydrogen bonds with water molecules.

The hydrogen bondings are only possible when hydrogen is covalently bonded to N, O or F atoms.

4 0

3 years ago

M&M balance equations

Alborosie

Answer:

Explanation:

To balance equations try to list out each element on both sides and start with the ones that aren't equal

6 0

3 years ago

V391 Pegasi b is a star that is 4,570 light years away from Earth. What is this distance in kilometers?

Lelu [443]

Its 43232 kilometers away

8 0

3 years ago

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Identify the parts of the atom that are labeled in the diagram

baherus [9]

Answer:

A- Nucleus

B-Energy levels

Explanation:

An atom refers to the smallest particle of an element that can take part in a chemical reaction.
An atom is made up of two major parts namely; the nucleus and the energy shell or energy levels.
The nucleus of an atom contains the sub atomic particles, protons and neutrons while the energy shells contain the sub atomic particle electrons.
It is important to note that the protons in the nucleus are positively charged which makes the nucleus to be positively charged.
On the other hand, energy shells are negatively charged because of the negative charge of the electrons.

6 0

4 years ago

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