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s344n2d4d5 [400]
3 years ago
9

The weights of all elements are always compared to oxygen.

Chemistry
1 answer:
marishachu [46]3 years ago
7 0

Answer:

The weights of all elements are always compared to the Carbon-12.

Explanation:

The weights of all elements are always compared to the Carbon-12 because the mass of carbon is 12 which is the exactly the sum of protons and neutrons.  

Oxygen was also considered the standard for some time but later this stander was rejected because in natural O¹⁷ and O¹⁸ were also present and this create the two different atomic mass tables.

AMU:

Atomic mass unit is define as the 1/12 the mass of an atom of carbon-12.

C12 has six neutron and six protons in the nucleus.

This unit is used to express the masses of atoms. We know that masses of atoms are very small and we do not have any such type of balance that can measure very small quantity. So that is way we use this scale to measure small quantity. For example, according to this scale

relative atomic mass of hydrogen is 1.008 amu

relative atomic mass of oxygen is 15.999 amu

relative atomic mass of uranium is 238.0289 amu

relative atomic mass of chlorine is 35.453 amu

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Metals lose electrons under certain conditions to attain a noble gas electron configuration. How many electrons must be lost by
viva [34]

Answer:

2 electrons

E. neon

Explanation:

Metals lose electrons under certain conditions to attain a noble gas electron configuration. Magnesium has 12 electrons and its electron configuration is

1s² 2s² 2p6⁶ 3s²

When magnesium loses 2 electrons, it acquires the electron configuration of neon (10 electrons).

5 0
3 years ago
Which phrase related to electromagnetism applies only to electric force? A. Attraction and repulsion B. North and south C. Push
iogann1982 [59]

Answer:

positive and negative

Explanation:

ik its prob not helpful now but ye sorry no ones answered lol

3 0
2 years ago
10 uses of water good answer​
Vikentia [17]

Answer:

For drinking.

For cleaning dishes.

For cooking.

for watering plants.

for washing clothes.

for bathing.

for generation of hydroelectricity.

for washing car.

making our dog bath

it helps in maintaining osmotic rate in humans

Explanation:

Hope this helps u

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5 0
3 years ago
Read 2 more answers
What is surface tension? describe how surface tension in water is useful for plant and animals.
Leni [432]

Answer:

It helps creatures to walk on the water.

Explanation:

8 0
3 years ago
Read 2 more answers
**Narrowed it down please help!**
natka813 [3]

Answers:

1. B.)

2. Both A.) and B.)

3. A.)

Step-by-step explanation:

1. Ions in gas phase

A plasma is a gas consisting of electrons and positively charged ions.

Because the particles are ions and electrons, rather than neutral atoms or molecules as in ordinary gases, scientists consider a plasma to be a fourth state of matter<em>.</em>

2. Kinetic Molecular Theory

Both activities illustrate the postulate.

A.) If the particles are extremely small and far apart, most of the volume of a gas is empty space. That's why it's easy to push the plunger of a capped nozzle syringe containing a gas.

B.) If the particles are far apart, it's easy for a coloured gas to spread into an inverted jar placed on top of a jar containing the gas.

3. Hot air balloon

The high temperature in the balloon makes the gas molecules spread apart according to Charles's law, because this law describes how a gas will behave at constant pressure.

As the hot air escapes from the vent, the combined mass of balloon + hot air becomes less than the mass of cold air that it displaces, and the balloon rises.

B.) is <em>wrong</em>. Boyle's law applies only when both the number of moles and  the temperature remain constant.

4 0
2 years ago
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