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sergiy2304 [10]
3 years ago
9

Selina drops a golf ball down a deep well. The ball falls with only the force of gravity acting on it. Without any air resistanc

e, as the golf ball falls into the well, its speed is:
A. constant
B. increasing
C. decreasing
D. directional
Chemistry
1 answer:
ss7ja [257]3 years ago
8 0

<u>Answer:</u>    A. constant

Without any air resistance, as the golf ball falls into the well, its speed is constant.

<u>Explanation:</u>

Given that when the ball is released,<em>there is no air resistance acting on ball. So the ball is freely falling. </em>

The only force acting on the freely falling body is the gravitational force pulling the body towards the centre of the earth.Here the only acceleration acting on the body is the <em>acceleration due to gravity.</em>

The acceleration due to gravity is 9.8 m/s^2. so through out the journey of the ball,the acceleration is 9.8 m/s^2. <em>So as the acceleration is constant, the speed is also constant.</em>

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Freezing point, boiling point, melting point, smell, attraction or repulsion to magnets, colour change, and many more examples.
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3 years ago
In the lab you measure a clean dry crucible and cover to be 24.36 grams. You obtain a 2cm piece of pure magnesium metal. After s
mart [117]

Answer:

1) 0.3g Mg

2)0.5g MgO

3)0.2g O

4)0.01mol Mg & 0.01mol O

5)0.01mol MgO

6) Empirical formula MgO

Explanation:

The mass og Mg is obtained by substracting 24.36g from 24.66g:

24.66 - 24.36 = 0.3g Mg

The ignition of Mg means that it's reacting with oxygen to form an oxide. The increase in the crucible mass after the Mg ignition is due to the addition of oxygen. However, the addition of few drops of water produces a new compound: a hydroxide. According to the oxidation state og Mg (2+), the only magnesium oxide possible is MgO. It happens because the oxidation state of oxygen in oxides is 2-. Which means that just one oxygen atom is required to electrically neutralize one magnesium atom.

We can use a conversion factor to know how much MgO is made from from 0.3 g of Mg:

0.3g Mg*\frac{16gO}{24.3gMg}= 0.2g O

Thereby the mass of the oxide is 0.2g O + 0.3g Mg = 0.5g MgO

We convert the mass of oxygen and magnesium to the respective amounts in moles by using conversion factors:

0.2g O*\frac{1 mol O}{16g O}= 0.01mol O

0.3g Mg*\frac{1mol Mg}{24.3g Mg}= 0.01mol Mg

The moles of MgO can be obtained from:

0.5g MgO*\frac{1mol MgO}{40.3g MgO}= 0.01mol MgO

To obtain the empirical formula, the amount fo moles of each elements must be divided by the smallest one, in this case, 0.01.

The result for both number of  Mg atoms and O atoms is 1. This can be interpreted to mean that there is a Mg atom for each O atom forming the  formula unit of the compound.

The step when water is added to the compound resulting after heating does not affect the calculations necessary for the magnesium oxide.

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2 years ago
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Answer:

3 people

Explanation:

7 0
1 year ago
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Answer : The correct option is (B).

Explanation :

Isomer : It is defined as a molecule have the same molecular or chemical formula but the different chemical structure or shape.

The given compound has 4 carbon atoms and also saturated compound because there is no double or triple bond present.

As we know that there are two structural isomers of butane.

(1) n-butane

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Thus, the correct option is (B).

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2 years ago
A gas is in a sealed container. How do you think the pressure will change if the container is cooled. explain your answer​
Semenov [28]

Answer:

If the container is cooled, the gas inside likewise gets colder and its pressure is observed to decrease.

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Since the container is rigid and tightly sealed, both the volume and number of moles of gas remain constant. If we heat the sphere, the gas inside gets hotter and the pressure increases.

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