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Answer:

A mixture of molecules is a group of molecules in which there are multiple different elements and atoms, that are in either fixed proportions or random. There are heterogeneous and homogenous mixtures.

Explanation:

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Substances having fixed chemical proportions will have fixed boiling and melting points. This is the reason that Pure substances have specific melting and boiling points because their chemical proportions are fixed. Mixtures melt and boil over a range of temperatures

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Answer:

base

Explanation:

The substance NaOH will be disassociated in ions of Na and OH.

Ahrrenius concept of base it's anything that dissolved in water produces OH.

The observers which would experience the same apparent solar time are observer B and observer E. This means the correct response as per the full question indicated in the attached document is number 2.

There are two types of Solar Time. They are:

Apparent solar time refers to the time of the day that is shown by the hour angle of the sun. It is also defined as the sun's position in the sky going by direct observation. Direction observation of the sun to determine Solar Time is possible using a Sundial.

See the link below for more about Apparent Solar Time:

https://brainly.com/question/6336054

Answer:

a theory of a experiment and the experiment acts like a judge determining if the hypothesis is right or wrong from the final test result

Explanation:

By definition, electrolysis is the use of an electric current to cause a chemical reaction which wouldn't otherwise happen. In a chemical change, bonds are either broken or formed. Electrolysis is a chemical change because, in the process of electrolysis, bonds are broken or formed.

The three-dimensional coordination number of the face-centered cubic arrangement  has a coordination number of 12 and contains 4 atoms per unit cell.

The coordination number, also known as ligancy, of a central atom in a molecule or crystal is the sum of all the atoms, molecules, or ions that are linked to it. This value is used in crystallography and materials science. A ligand is the ion, molecule, or atom that surrounds the center ion, molecule, or atom.

The number of atoms, ions, or molecules that a central atom or ion bears in a complex or coordination compound or in a crystal as its near neighbors is known as the coordination number, also known as ligancy.

In contrast to oxidation state, which is a number assigned to an element in chemical combination and represents the number of electrons lost or gained by an atom of that element in the compound, co-ordination number is the number of co-ordination bonds with which the ligands are bound to the central ion.

Thus, the face-centered cubic arrangement  has a coordination number of 12 and contains 4 atoms per unit cell.

To learn more about coordination number, follow the link;

https://brainly.com/question/16882931

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Answer:

C. size and shape

Explanation:

Physical properties such as size, shape, color, density, magnetism or the

ability to sink or float can be used to separate the substances in a mixture..

Filtration is when matter is passed through a filter and the larger particles

are separated out. Magnets can be used to separate magnetic matter from

non-magnetic matter in a mixture. Objects that float when placed in water

can be separated from those that don’t by placing the mixture in water.

Answer:

To identify a pure liquid substance using the physical properties of solubility, density, and boiling point. The physical properties of a pure substance can be measured without changing the composition of the substance.

Explanation:

Answer:

The is less friction on an icy surface

Explanation:

This is because when u walk on plain ground there is steady friction on the surface but when u walk on an icy floor these is barely any friction which is why it's hard to walk on.

Answer:

There is less friction on an icy surface.

Hope that helps.

Explanation:

Answer:

One element takes the place of another in a compound

Explanation:

I just took a test for it and got it right. :)

Hope This Helps :)

Answer: During the summer, the sun's rays hit the Earth at a steep angle. ... Also, the long daylight hours allow the Earth plenty of time to reach warm temperatures. During the winter, the sun's rays hit the Earth at a shallow angle. These rays are more spread out, which minimizes the amount of energy that hits any given spot.

Answer:8.334×10^-6 moles

Explanation:

a mole is 6.023×10^23

5.02×10^18 ÷ 6.023×10^23=8.33×10^-6

Answer:

pure substance does not contain two or more elements

Answer: A increase

Explanation: The temperature of room will increase. If a refrigerator door is open then more flow rate of coolant is required in order to maintain lower temperature So the compressor will be running continuously also heat exchange happening through condenser increases the room temperature rather than decreasing.

There are many with atomic number 1

hydrogen , helium , lithium , beryllium etc.

Hope this answer helps you dear!.

Answer:

With atomic number 1 is hydrogen

Explanation:

The valence with 1 is hydrogen, lithium.....

Answer: protons

Explanation:

a) Neutrons are located in the nucleus but have a negative charge.

b) Atoms are not subatomic particles but are rather made of subatomic particles.

c) Electrons are subatomic particles with a negative charge that are located outside of the nucleus.

d) Protons are subatomic particles that are located in the nucleus and have a positive charge.

Answer:

you draw the line first to the light bulb and then you connect it to the battery then you connect it to microscope

Explanation:

hope this helped pls mark it brainlest pls and thank you:)

Answer:

g/cm^3

Explanation:

Density= m/v

gram is a measurement of mass

cm^3 is a measurement of volume

Hope this helps:) Have a good day!

Slaked lime is the ans

thank me later : p

Answer:

Explanation:

1) The vertical Columns are called groups and the Horizontal rows are

called periods.

2) Elements in the same groups have the same number of electrons in their

outer Shells for example, all the elements in Group VII have 7

electrons on their outer shells.

3) Elements in the same group have similar Chemical and physical properties

Explanation:

1) Columns

Horizontal

2)Shell

Group VII

3)Chemical

Explanation:

most common elements that bond with oxygen is Hydrogen (H2) to form water

Answer:

17.19%

Explanation:

mass of oxygen = 7.221 - (1.990 + 2.341)

= 2.890g

Empirical formula of the compound

For carbon,

1.990/12 = 0.1658

For hydrogen,

2.341/1 = 2.341

For oxygen,

2.890/16 = 0.1806

0.1658 ÷ 0.1658 = 1

2.341 ÷ 0.1658 = 14.11

0.1806 ÷ 0.1658 = 1.089

Empirical formula of the compound= CH14O

Molar mass= (1×12) + (14×1) + (1×16)

= 12+14+16

= 42g/mol

percentage composition= 7.221/42 × 100

= 17.19%