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4 years ago

Which property of matter changes during a chemical change but not during a physical change

1 answer:

8 0

Answer:In a physical change, atoms are not rearranged and the matter's physical and chemical properties are unchanged. Chemical changes, on the other hand, rearrange the atoms of matter in new combinations, resulting in matter with new physical and chemical properties.

Explanation:

easy

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Jazz and Pam went to Six Flags over Texas. They had fun riding the rides at the

ser-zykov [4K]

Answer:

newtons first law

Explanation:

an object in motion will stay in motion unless acted upon by an outside force

6 0

3 years ago

What units should be used when describing the density of oil?

Alinara [238K]

Answer:

Generally, density is measured using he SI unit for measurement of density which is kg/m³ or the cgs units used to describe the density of a substance which is g/cm³

However, due to its nature (being composed of varying amount proportions of different compounds mixed together resulting in a variation of the density of naturally produced crude oil) of having different densities whereby the lighter oils are more easily processed than the heavier variety of oils, oil density is related to the quality of the oil and it is usually measures in API gravity as follows;

°API = (141.5/S.G.) - 131.5

Where;

API = American Petroleum Institute

S. G. = Specific gravity

As such the API gravity of fresh water with a S. G. of 1.0 has is 10 degrees

Explanation:

6 0

3 years ago

What does he want? change into passive

Marina CMI [18]

There’s no picture if you meant to add a picture

3 0

3 years ago

Calculate the root mean square velocity of nitrogen molecules at 25°c. a) 729 m/s b) 515 m/s c) 149 m/s d) 297 m/s

Elena L [17]

Answer:

root mean square velocity of nitrogen at 25°c is 515 m/s

correct option is b) 515 m/s

Explanation:

given data

temperature = 25°c = 25 + 273 = 298 K

to find out

root mean square velocity of nitrogen molecules

solution

we know that root mean square velocity of gas is Vrms = $\sqrt{\frac{3RT}{M}}$ .......................1

mass of gas = M

universal gas constant = R

temperature = T

and we know mass of nitrogen = 28 g = 28 × $10^{-3}$ kg

Vrms = $\sqrt{\frac{3RT}{M}}$

Vrms = $\sqrt{\frac{3(8.314)298}{28*10^{-3}}}$

Vrms = 515.22 m/s

root mean square velocity of nitrogen at 25°c is 515 m/s

correct option is b) 515 m/s

3 0

3 years ago

How can you tell the difference between an ionic compound and a molecule?

slamgirl [31]

Explanation:

An ionic compound is defined as the compound formed by transfer of electrons from one atom to another.

For example, lithium atom on donating its one valence electron to chlorine atom will result in the formation of an ionic bond and the compound formed is LiCl.

A molecule is defined as a substance which can contain either same or different elements.

For example, $Cl_{2}$ , $MgSO_{4}$ etc are molecules.

A molecule can contain either a covalent or ionic bond. But an ionic compound will always contain an ionic bond.

7 0

3 years ago