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3 years ago

With respect to a fixed point, motion is defined as a change in- A)speed B)position

Chemistry

1 answer:

Arisa [49]3 years ago

4 0

Answer:

With respect to a fixed point, motion is defined as a change in position.

Explanation:

MOTION -: Motion is described as the fact in which any object or body changes its position over the time with respect to a fixed point .

Motion is defined as displacement, distance, velocity , acceleration, speed , and time in mathematical terms. By linking an observer to a frame of reference and measuring the shift in the position of the body with a change in time relative to that frame, the motion of a body is observed.

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4 years ago

Why can metals be extracted using carbon

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If a metal is less reactive than carbon, it can be extracted from its oxide by heating with carbon. The carbon displaces the metal from the compound, and removes the oxygen from the oxide. This leaves the metal.

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2 years ago

Where would you have to be to see the view shown above? Explain.

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In front of a telescope or on the moon

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3 years ago

What effect did the Punic Wars have on Rome's military development? (4 points)

Doss [256]

Answer:

The correct answer is: “The Roman army grew in size and became dominant in the Mediterranean region”.

Explanation:

The Punic wars were a series of three wars that were fought between Rome and Carthage. At the end of the third war, Rome established itself as an empire, it conquered the Carthage’s empire, destroyed it completely and became the most powerful state of the Western Mediterranean.

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3 years ago

How much energy (heat) is required to convert 248 g of water from 0 oC to 154 oC? Assume that the water begins as a liquid, that

Nuetrik [128]

Answer:

The total heat required is 691,026.36 J

Explanation:

Latent heat is the amount of heat that a body receives or gives to produce a phase change. It is calculated as: Q = m. L

Where Q: amount of heat, m: mass and L: latent heat

On the other hand, sensible heat is the amount of heat that a body can receive or give up due to a change in temperature. Its calculation is through the expression:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the change in temperature (Tfinal - Tinitial).

In this case, the total heat required is calculated as:

Q for liquid water. This is, raise 248 g of liquid water from O to 100 Celsius. So you calculate the sensible heat of water from temperature 0 °C to 100° C

Q= c*m*ΔT

$Q=4.184\frac{J}{g*C} *248 g* (100 -0 )C$

Q=103,763.2 J

Q for phase change from liquid to steam. For this, you calculate the latent heat with the heat of vaporization being 40 and being 248 g = 13.78 moles (the molar mass of water being 18 g / mol, then $\frac{248 g}{18 \frac{g}{mol} } =13.78 moles$ )

Q= m*L

$Q=13.78moles*40.79 \frac{kJ}{mol}$

Q=562.0862 kJ= 562,086.2 J (being 1 kJ=1,000 J)

Q for temperature change from 100.0 ∘ C to 154 ∘ C, this is, the sensible heat of steam from 100 °C to 154°C.

Q= c*m*ΔT

$Q=1.99\frac{J}{g*C} *248 g* (154 - 100 )C$

Q=25,176.96 J

So, total heat= 103,763.2 J + 562,086.2 J + 25,176.96 J= 691,026.36 J

The total heat required is 691,026.36 J

8 0

3 years ago