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liubo4ka [24]
3 years ago
9

Describe each of the following as a physical or chemical property. a. Neon is a colorless gas at room temperature.b. Apple slice

s turn brown when exposed to air. c. Phosphorus will ignite when exposed to air. d. At room temperature, mercury is a liquid.
Physics
2 answers:
Cloud [144]3 years ago
5 0

Answer: Neon is a colorless gas at room temperature: Physical property

At room temperature, mercury is a liquid: Physical property

Apple slices turn brown when exposed to air: Chemical property

Phosphorus will ignite when exposed to air: Chemical property

Explanation:

Physical property is defined as the property of a substance which becomes evident during physical change in which there is alteration in shape, size etc. No new substance gets formed during physical change.

Example:  Neon is a colorless gas at room temperature

At room temperature, mercury is a liquid.

Chemical property is defined as the property of a substance which becomes evident during chemical change in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Apple slices turn brown when exposed to air: It undergoes oxidation which is a chemical change

Phosphorus will ignite when exposed to air: It undergoes oxidation which is a chemical change

iris [78.8K]3 years ago
5 0

Answer:

a) Physical property

b) chemical property

c)  chemical property.

d) Physical property

Explanation:

  • The Physical property of a substance is the property that are exhibited by the substance without changing its fundamental identity at the molecular level.
  • It includes the mechanical properties, visual appearance, electrical properties and thermal properties. Such changes can easily be reverted.The chemical properties involve a change at the fundamental molecular level. It is non reversible and leads to the formation of new molecule.

a) Neon is a colorless gas at room temperature due to its physical property

b) apple slice turns brown due to oxidation in the air this happens due to chemical reaction and it is due to the chemical property of the substance present in apple.

c) Phosphorous when ignites on exposure to air forms a new substance which can't be revered back to phosphorous and has undergone a chemical change due to its chemical property.

d) At room temperature the mercury is liquid represents its physical property because it still remains mercury by its molecular composition.

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3 years ago
Water drips from the nozzle of a shower onto the floor 193 cm below. The drops fall at regular (equal) intervals of time, the fi
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Answer: 108.81 cm and 48.66 cm

Explanation:

In this, we have to make sure to keep in mind the Gravity effects on the drops. The drops will accelerate when they fall making them travel faster. This means, the velocity is not constant.

What is know:

Height (h) = 193 cm

Gravity (g) =  981 cm/s^{2}

Initial Velocity = 0

First, we can know how long it take to the drop to travel to the floor. It can be done with the following equation:

x = V_{0} t + \frac{1}{2} at^{2}    (1)

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a is the aceleration, which in this case is the gravity.

With the Initial Velocity equals zero the equations simply:

193 cm = \frac{1}{2}gt^{2}

To search for the time:

t =\sqrt{\frac{2*193cm}{981cm/s^{2} } }

t = 0.627 s

This is the time it takes a drop to fall to the floor, with this time and knowing other 3 drops have driped from the shower by this time. We can calculate how much time it takes the shower to drip each drop.

Time for Drip = t/4

Time for Drip = 0.156

This time is the difference between each drop, using the same equation we can calculate where was each drop, because now it is know how much time had each drop after being drip from the shower.

Our first is already on the floor (193 cm) with 0.627 s, The second drops have been falling for (0.627s - 0.156) 0.471 s and our third drop for (0.627s - 0.156 - 0.156) 0.315 s

We can use (1) to know how far have each drop traveled on these times. We know the Initials Velocity are 0, know we need ot know the distances.

For the second drop:

x = \frac{1}{2} (981cm/s^{2})(0.471s)^{2}

x =108.81 cm

For the third drop:

x = \frac{1}{2} (981cm/s^{2})(0.315s)^{2}

x = 48.66 cm

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