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3 years ago

What is the name of the element that has an atomic number of 8?

Chemistry

2 answers:

12345 [234]3 years ago

3 0

Oxygen is the element

ivolga24 [154]3 years ago

3 0

Oxygen and it has 8 protons and 8 neutrons

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Calculate the concentration of h3o⁺ in a solution that contains 5.5 × 10-5 m oh⁻ at 25°c. Identify the solution as acidic

Andreas93 [3]

Answer: $[H_3O^+]=1.6\times 10^{-10}M$ , the solution is basic

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

Acids have pH ranging from 1 to 6.9 and bases have pH ranging from 7.1 to 14.Neutral substances have pH of 7.

$pH=-\log [H_3O^+]$

$pOH=-\log[OH^-]$

Putting in the values:

$pOH=-\log[5.5\times 10^{-5}]$

$pOH=4.2$

$pH+pOH=14$

$pH=(14-pOH)=(14-4.2)=9.8$

$9.8=-\log [H_3O^+]$

$[H_3O^+]=1.6\times 10^{-10}M$

As pH is more than 7, the solution is basic

7 0

2 years ago

Before a new medicine is approved, scientists study the effects the medicine has on different parts of the body. Often, a medici

MissTica

Answer:

different cell specialized in different function

6 0

2 years ago

The nuclear mass of 56fe is 55.9207 amu. calculate the binding energy per nucleon for 56fe.

Aneli [31]

Fe (iron) has 26 protons,30 neutrons and 26 electrons. In order to calculate the binding energy, first you need to find the total mass of all particles in the nucleus:

26 x mass of proton + 30 x mass of neutron ( all in a.m.u.) = say "m"

Mass defect is m- 55.9207 amu, then convert it into grams and put in equation E = mc2 to get binding energy of Fe.

Divide it by number of nucleons to get binding energy per nucleon.

8 0

2 years ago

Read 2 more answers

Somethings wrong with Tommy’s left eye. You have to examine it very carefully. Can you bring the parts of the eye in the correct

Lubov Fominskaja [6]

Answer:

cornea - Iris - lens - retina.( From outside to inside)

Explanation:

The correct order from outside to inside is cornea - Iris - lens - retina.

The cornea is the front part of the eye. It helps the eye to focus on light. It is transparent.

The Iris is located at the back of the cornea.The quantity of light that falls on the eye is determined by the Iris. The Iris is colored.

Lens allows light to be focused on the retina. It is behind the Iris.

The retina is the part of the eye that senses light. The retina sends the light signal it senses to the brain for interpretation. It is the innermost if all the options given.

3 0

3 years ago

Classify each amino acid by the chemical properties of its side chain (R group) at pH 7·Select the amino acid that fits best in

Leno4ka [110]

Answer:

. 1. This amino acid has a positively charged R group: ARGININE

2. This amino acid has a negatively charged R group: ASPARTATE

3. This amino acid has a neutral polar R group: NONE

4. This amino acid has a nonpolar aliphatic R: VALINE

5. This amino acid has an aromatic R group: TRYTOPHAN

Explanation:

1) Arginine contains an extra amino group bearing a positive charge, in its chain which imparts basic properties to it

2) Aspartate contains an extra carboxyl group with a dissociable protron. Once the Protron is dissociated, it carries an extra negative charge in its side chain (R)

3) NONE of the amino acids given belong to this group because amino acids with neutral polar R groups contain functional groups that form hydrogen bonds with water. But, this is not the case with tryptophan aspartate valine or arginine

4) Valine has a R group that is hydrocarbon in nature and thus hydrophobic.

5) Trytophan has a benzene ring in its side chain

7 0

2 years ago