A(n) _____ is the smallest complete part of a compound.A. ion
B. atom
C. element
D. molecule

Answers

Answer 1

Answer: The answer to this is: a molecule

Answer 2

Answer: A molecule is the smallest complete part of a compound. I think the answer is D. Molecule

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What does the measurement 6.5 V represent? A. Electric field B. Electric potential C. Electric potential energy D. Electric force

Answers

Option B. Electric potential.

V means volts and is the unit defined for the electric potential or voltage.

Answer:

B. Electric potential

Explanation:

If a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°C, what will be the volume at 50°C? A. 0.002010812m3
B. 0.004021624m3
C. 0.002021624m3
D. 0.000010812m3

Answers

As per the question the volume of mercury is given as 0.002 m^3 at 20 degree Celsius.

We are asked to calculate the volume of the mercury at 50 degree Celsius.

This problem is based on thermal expansion of matter.

Let us consider the initial and final volume of the mercury is denoted as -

$v_(1) \ and\ v_(2)$

Let the initial and final temperature of the mercury is denoted as -

$T_(1)\ and \ T_(2)$

As per question

$v_(1) =0.002 m^3$ $v_(2) =?$

$T_(1) =20^0 C$ $T_(2) =50^0 C$

The change in temperature is

$T_(2) -T_(1)$

$= 50^0 C -20^0 C$

$= 30^0 C$

Mercury is a fluid.So we have to apply volume expansion of liquid .

The coefficient of of volume expansion of mercury $[ \gamma ]$ at 20 degree Celsius is 0.00018 per centigrade.

As per volume expansion of liquid,

$V_(T) = v_(1) [1 +\gamma [T_(2) -T_(1) ]]$

Here $V_(T)$ is the volume at T degree Celsius.

Hence volume at 50 degree Celsius is calculated as-

$v_(2) =v_(1) [1+\gamma[50-30]]$

$= 0.002[1+0.00018*30]$

$=0.0020108m^3$ [ans]

As per the options given in the question ,option A is close to the calculated value. So option A is right.

The answer to this question lies in understanding the Combined Gas Law in chemistry, which combines Boyle's, Charles', and Gay-Lussac's gas laws. This law shows the relationship between pressure, volume, and temperature of gases and is represented by the equation P1V1/T1 = P2V2/T2. Changes in pressure (P) and volume (V) are directly proportional to one another, but these are inversely proportional to changes in temperature (T). This question must assume that pressure is constant, so the Ps cancel out and the equation becomes V1/T1 = V2/T2. Additionally, temperature should be converted to Kelvins (K) by adding 273 to the temperature in Celsius (so 20 C = 293 K, and 50 C = 323 K). If V1 = 0.002 and T1 = 293 and T2 = 323, then we solve the equation as V2 = T2*V1/T1 or V2 = (323*0.002)/293, so the answer is approximately equal to 0.0022... or answer (C).

What is the minimum current rating of the motor disconnecting means for a 40-horsepower, 208-volt, 3-phase squirrel-cage motor?

Answers

Answer:

The minimum current rating of the motor disconnecting means is 165 Amperes.

Explanation:

First convert the given power into units of watt. Since,

1 horsepower = 746 watts

Therefore,

40 horsepower = 40 x 746 watts

40 horsepower = 29840 watts

Since, we know that:

Power = Full Load Current (FLC) x Voltage

FLC = Power/Voltage

FLC = 29840 watts/208 volts

FLC = 143.46 Amperes

Now, the current for disconnecting means is at least 115% of the FLC, for the motors rated at 600 Volts or less.

Current for Disconnecting Means = (1.15)(143.46 A)

Current for Disconnecting Means = 165 Amperes

As we move through the visible spectrum, red to violet (right to left in the image), the wavelength __________ and the frequency ____________.A) increases; decreases

B) increases; increases

C) decreases; increases

D) decreases; decreases

Answers

Answer;

C) decreases; increases

Explanation;

As we move through the visible spectrum, red to violet (right to left in the image), the wavelength decreases and the frequency increases.
Electromagnetic spectrum comprises of electromagnetic waves arranged in the order of increasing or decreasing frequency and wavelength.
These electromagnetic waves includes; radio waves, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays.
In electromagnetic spectrum as you move from left to right, that is from the radio waves towards the gamma rays, the wavelength decreases as the frequency increases; while from gamma rays towards the radio waves the wavelength increases while the frequency decreases.

As we move through the visible spectrum, red to violet (right to left in the image), the wavelength decreases and the frequency increases. The correct option among all the options that are given in the question is the third option or option "C". I hope this answer helps you and you will understand the solution also.

Explain the law of conservation of energy.

Answers

Energy cannot be created or lost, but only changes form.

Answer:

Energy cant be created or lost, it only changes form.

Explanation:

The answer above is correct.

What happens to the temperature of a substance during a phase change?a. The temperature increases.
b. The temperature decreases.
c. The temperature remains constant.
d. The temperature fluctuates randomly.