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xxTIMURxx [149]

3 years ago

14

Which of the following best describes weight? The amount of space an object takes up The amount of matter in an object The force

on an object due to its mass and gravity The force on an object due to its speed and location

1 answer:

Alenkasestr [34]3 years ago

4 0

The force of an object due mass and gravity.it can also be defined as the force exerted by gravity on a body

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a partial grassland food web is shown. Which of the following best describes a relationship in this grassland.

vampirchik [111]

Answer:

The answer is "Upland sandpipers are primary and secondary consumers because they eat grasses and grasshoppers".

Explanation:

The limited farmland nutrition web, that reveals better which Upland sandpipers were main and secondary customers in this farmland since they eat grass with grasshoppers.

It also eat butterflies, bricks, shrimps, mollusks, worms, and nematodes, throughout contrast to bugs, which sandpipe gathers seed of hay, plants, conifers, and rice, rye, or strawberries.
Highlands dragonflies sometimes assemble in recently burnt fields with such a wealth of squirrels.

3 0

3 years ago

Which two subatomic particles have opposite charges?

Tasya [4]

Answer:

C ) Proton and Electron

<h2><u>MORE</u><u> </u><u>TO</u><u> </u><u>NOW</u><u> </u></h2>

Atoms are the smallest particle of matter which are capable of independent existence

It consists of proton, neutron and electron

Proton - positive charge
electron - negative charge
neutron - neutral

Electrons was discovered by j.j Thomas

Protons was discovered by Eugen Goldstien

Neutron was discovered by James Chadwick

Groups of atoms combine together to form molecule

8 0

3 years ago

Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only , , and . Co

elena55 [62]

Answer:

The molecular formula of Terephthalic acid = $C_8H_{6}O_4$

Explanation:

Taking incomplete things from the original source and assuming,

Mass of water obtained = 16.34 mg

1 mg = 10⁻³ g

Mass of water obtained = 16.34 ×10⁻³ g

Molar mass of water = 18 g/mol

Moles of $H_2O$ = 16.34 ×10⁻³ g /18 g/mol = 0.000907778 moles

2 moles of hydrogen atoms are present in 1 mole of water. So,

<u>Moles of H = 2 x 0.000907778 = 0.0018156 moles </u>

Molar mass of H atom = 1.008 g/mol

<u>Mass of H in molecule = 0.0018156 x 1.008 = 0.00183 g </u>

Mass of carbon dioxide obtained = 106.4 mg

1 mg = 10⁻³ g

Mass of carbon dioxide obtained = 106.4 ×10⁻³ g

Molar mass of carbon dioxide = 44.01 g/mol

<u>Moles of $CO_2$ = 106.4 ×10⁻³ g /44.01 g/mol = 0.002418 moles </u>

1 mole of carbon atoms are present in 1 mole of carbon dioxide. So,

Moles of C = 0.002418 moles

Molar mass of C atom = 12.0107 g/mol

<u>Mass of C in molecule = 0.002418 x 12.0107 = 0.029037 g </u>

Given that the Terephthalic acid only contains hydrogen, oxygen and carbon. So,

Mass of O in the sample = Total mass - Mass of C - Mass of H

Mass of the sample = 50.20 mg

1 mg = 10⁻³ g

Mass of the sample = 50.20 ×10⁻³ g

<u>Mass of O in sample = 50.20 ×10⁻³ g - 0.029037 g - 0.00183 g = 0.019333 g</u>

Molar mass of O = 15.999 g/mol

<u>Moles of O = 0.019333 / 15.999 = 0.0012083 moles </u>

Taking the simplest ratio for H, O and C as:

0.0018156 : 0.0012083 : 0.002418

<u> = 3 : 2 : 4 </u>

The empirical formula is = $C_4H_3O_2$

Molecular formulas is the actual number of atoms of each element in the compound while empirical formulas is the simplest or reduced ratio of the elements in the compound.

Thus,

Molecular mass = n × Empirical mass

Where, n is any positive number from 1, 2, 3...

<u>Mass from the Empirical formula = 4×12 + 8×1 + 16×2= 88 g/mol </u>

Given, Mass = 28.2 g

Moles = 0.170 moles

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$0.170\ mole= \frac{28.2\ g}{Molar\ mass}$

<u>Molar mass = 165.8824 g/mol </u>

So,

Molecular mass = n × Empirical mass

165.8824 = n × 88

<u>⇒ n = 2 </u>

The molecular formula of Terephthalic acid = $C_8H_{6}O_4$

4 0

3 years ago

A scientist discovers a new type of polymer. What must be true about this polymer?

DochEvi [55]

The correct answer is D

a polymer is a substance made up of large molecules with repeating sub units called monomers.

A is incorrect because its a ring structure which means it cannot form the long chain that is exhibited by polymers.

B is incorrect because the double bonds will cause saturation, hence no monomer can bond to another monomer to form the large molecule.

C is incorrect because the large molecule has repeating sub-units hence only specific types of molecules can be present, and it is usually carbon and hydrogen.

3 0

3 years ago

A neutral atom and an ion of the same element have the same number of _______. They have a different number of _______ and hence

kow [346]

Answer:

a. Protons

b. Electrons

Explanation:

The atomic number of an element is also the proton number. Since the atom is neutral, the proton number and the electron number are equal. But this is different for an ion in that the element has either gain or loss an electron and so, the electron number differ from the proton number.

6 0

3 years ago