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4 years ago

5

The smallest unit of a compound is called a ___________.

1 answer:

Anastaziya [24]4 years ago

7 0

The smallest unit of a compound is a molecule! The molecule is made up of a cluster of atoms which differ based on the exchange or transfer/loss/gain of electrons.

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How many milliliters of water at 25.0°C with a density of 0.997 g/mL must be mixed with 162 mL of coffee at 94.6°C so that the r

Andre45 [30]

Answer:

The volume of water is 139 mL.

Explanation:

Due to the Law of conservation of energy, the heat lost by coffee is equal to the heat gained by the water, that is, the sum of heats is equal to zero.

$Q_{coffee} + Q_{water} = 0\\Q_{coffee} = - Q_{water}$

The heat (Q) can be calculated using the following expression:

$Q=c \times m \times \Delta T$

where,

c is the specific heat of each substance

m is the mass of each substance

ΔT is the difference in temperature for each substance

The mass of coffee is:

$162mL.\frac{0.997g}{mL} = 162g$

Then,

$Q_{coffee} = - Q_{water}\\c_{c} \times m_{c} \times \Delta T_{c} = -c_{w} \times m_{w} \times \Delta T_{w}\\m_{c} \times \Delta T_{c} = -m_{w} \times \Delta T_{w}\\m_{w} = \frac{m_{c} \times \Delta T_{c}}{-\Delta T_{w}} \\m_{w}=\frac{162g \times (62.5 \°C - 94.6 \°C ) }{-(62.5 \°C - 25.0 \°C)} \\m_{w} = 139 g$

The volume of water is:

$139g.\frac{1mL}{0.997g} =139mL$

7 0

4 years ago

Baseball scouts often use a radar gun to measure the speed of a pitch. One particular model of radar gun emits a microwave signa

Firdavs [7]

Since the Units presented are not in the International System we will proceed to convert them. We know that,

$1 mi/h = 0.447 m/s$

So the speed in SI would be

$V=95mi/h(\frac{0.447m/s}{1mi/h})$

$V=42.465 m/s$

The change in frequency when the wave is reflected is

$f'=f(1+\frac{V}{c})$

Or we can rearrange the equation as

$f' = f + f\frac{V}{c}$

f' = Apparent frequency

f = Original Frequency

c = Speed of light

$f'-f = f\frac{V}{c}$

$\Delta f = f\frac{V}{c}$

Replacing,

$\Delta f = (10.525*10^9)(\frac{42.465}{3*10^8})$

$\Delta f =1489.8 Hz$

Since the waves are reflected, hence the change in frequency at the gun is equal to twice the change in frequency

$\Delta f_T = 2 \Delta f$

$\Delta f_T = 2(1489.8Hz)$

$\Delta f_T = 2979.63Hz$

Therefore the increase in frequency is 2979.63Hz

4 0

4 years ago

What kind of model is shown below?

Rudiy27

D. a foot model

btw this is a joke right cuz there ain’t no picture lol

7 0

3 years ago

Sound source A is located at x = 0, y = 0, and sound source B is located at x = 0, y = 2.3 m. The two sources radiate coherently

Oliga [24]

Answer:

Solution is given in the attachments

4 0

3 years ago

A sprinter runs 50m. You are given a stopwatch. Describe how you would measure: 1. the average speed of the sprinter over the en

Oksanka [162]

Answer:

Explanation:

Distance = 50 m

1. To find the average speed, first start the stop watch as the sprinter starts running and then stop it when he reaches the finish line.

Now note the time taken by the sprinter to run for 50 m.

The average speed of the sprinter is defined as the ratio of total distance covered to the total time taken.

Average speed = total distance / total time

2. To find the instantaneous speed, check the seed of the sprinter as he is at the finish line.

6 0

3 years ago