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3 years ago

Gold and Platinum are found in free state in nature-Give reason.

Chemistry

1 answer:

ValentinkaMS [17]3 years ago

8 0

Because they’re toooo unreactive so they do not combine with any other element.

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A block weighing 8.5 N requires a force of 2 Nto push it along at constant velocity.What is the coefficient of friction for thes

konstantin123 [22]

Answer:

The coefficient of friction of the surface μ = 0.235

Explanation:

Values of the given variables:

Weight of block = 8.5 N

Pushing force F = 2 N

velocity = constant

Solution:

Newton's Second Law of motion states that acceleration of an object depends on the mass of the object and the force applied

F = m a

Since v =constant, a = 0. Thus

Net force Fnet = 0.

Now F_net is the sum of the pushing force and the frictional force along the horizontal, which opposes the motion:

Fnet = Fpushing - Ffrictional_force

Given that Fnet = 0, Fpushing = Ffrictional_force. and Ffrictional_force = 2 N

Equation of friction is given by

Ffrictional_force = μ*W

2 = μ*8.5

μ = 2/8.5 = 0.235

5 0

3 years ago

How many sides does a dodecahedron have?

Vladimir [108]

✦ ✦ ✦ Beep Boop - Blu Bot! At Your Service! Scanning Question . . . Code :

Green! Letters and Variables Received! ✦ ✦ ✦

Question: How many sides does a dodecahedron have?

Answer: The dodecahedron has 12 sides.

8 0

3 years ago

A sample of propane (C3H8) has a mass of 0. 47 g. The sample is burned in a bomb calorimeter that has a mass of 1. 350 kg and a

Nady [450]

The amount of heat released by the sample has been 22.54 kJ. Thus, option C is correct.

The specific heat has been defined as the amount of heat required to raise the temperature of 1 gram of substance by 1 degree Celsius.

The specific heat has been expressed as:

$q=mc\Delta T$

<h3 /><h3>Computation for the heat absorbed</h3>

The iron and calorimeter are in side the closed system. Thus, the energy released by the sample, has been equivalent to the energy absorbed by the calorimeter.

$q_{released}=q_{absorbed}\\
q_{released}=m_{calorimeter}\;c_{calorimeter}\;\Delta T$

The given mass of calorimeter has been, $m_{calorimeter}=1350\;\rm g$

The specific heat of the calorimeter has been, $c_{calorimeter}=5.82\;\rm J/g^\circ C$

The change in temperature of the calorimeter has been, $\Delta T=2.87^\circ \rm C$

Substituting the values for heat released:

$q_{released}= 1350\;\text g\;\times\;5.82\;\text J/\text g^\circ \text C\;\times\;2.87^\circ \text C\\
q_{released}=22,549.5\;\text J\\
q_{released}}=22.54\;\rm kJ$

The amount of heat released by the sample has been 22.54 kJ. Thus, option C is correct.

Learn more about specific heat, here:

brainly.com/question/2094845

6 0

3 years ago

What is the pH of a 0.1M basic solution? <br><br> A. 7 <br> B. 0<br> C. 1<br> D. 13

Cloud [144]

C is the correct answer

4 0

3 years ago

The lab assistant accidentally poured water in the spirit (alcohol). How would you help him/her to get back the spirit. Explain.

Reptile [31]

The water and the spirit can be easily separated by a method called fractional distillation.

<u>Explanation:</u>

There are many ways of separating alcohol from water. The most common method is by heating. Water has a higher boiling point when compared to alcohol and the water can be easily evaporated into the air.
This method is called Fractional distillation. As it requires a rounded flash, a beaker, and a container. If the content is put under the heat for a certain degree celsius the water in the content is evaporated.
It is to be collected and connected to a container. At last, the alcohol and water are separated.

6 0

3 years ago