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2 years ago

How can you verify that metals conduct electricity and explain

Chemistry

1 answer:

Ann [662]2 years ago

4 0

Answer:

delocalised electrons

Explanation:

In a metal there are delocalised(free) electrons which means they carry electrical charge through the metal.

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I have a rock with the mass of 4.8 and a volume of 2.3.

WARRIOR [948]

Depending on what you need to round it to, it’s
1.9565
Or
1.957
Or
1.96

Density is mass/volume so it’s simply 4.8/2.3
Which equals
1.95652174

Hope this helped, good luck!

3 0

3 years ago

Read 2 more answers

On your first day working in a laboratory, you are told to make up 1 Liter of a 0.5 Molar Tris solution with a pH of 7.4. You me

GenaCL600 [577]

Answer:

60.57g of TRIS did you use

Explanation:

The concentration of the Tris solution buffer is 0.5 molar (That is, 0.5 moles per liter). As you need to make 1L, you need to have in the solution <em>0.5 moles of TRIS.</em>

<em />

To convert these moles of TRIS to grams you need to use the molecular weight of TRIS base (121.14g/mol), thus:

0.5 moles TRIS * (121.14g / mol) =

7 0

3 years ago

A gas with a volume of 20.0l at a pressure of 275 kpa is allowed to expand to a volume of 35.0l. what is the pressure in the con

sladkih [1.3K]

Answer:

$\boxed {\boxed {\sf 2. \ 157 \ kPa}}$

Explanation:

Since temperature remains constant, the only variables that change are volume and pressure. Therefore, we are using <u>Boyle's Law.</u> This states that the pressure is inversely proportional to the volume. The formula is:

$P_1V_1=P_2V_2$

We know the gas starts with a volume of 20.0 liters at a pressure of 275 kPa. We can substitute these values into the left side of the formula.

$275 \ kPa *20.0 \ L=P_2V_2$

We know the gas expands to a volume of 35.0 Liters, but we do not know the pressure.

$275 \ kPa *20.0 \ L=P_2* 35.0 \ L$

Since we are solving for the new pressure, we must isolate the variable P₂. It is being multiplied by 35.0 Liters and the inverse of multiplication is division. Divide both sides by 35.0 L.

$\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}= \frac{P_2*35.0 \ L}{35.0 \ L}$

$\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}=P_2$

The units of liters cancel.

$\frac {275 \ kPa * 20.0 }{ 35.0 }=P_2$

$\frac {5500}{35.0} \ kPa= P_2$

$157.142857 \ kPa=P_2$

The original measurements of pressure and volume have 3 significant figures, so our answer must have the same. For the number we calculated, that is the ones place.

The 1 in the tenths place (157.142857) tells us to leave the 7 in the ones place.

$157 \ kPa= P_2$

If the gas expanded to a volume of 35.0 liters while the temperature remained constant, the pressure in container was approximately 157 kilopascals.

8 0

2 years ago

What would happen if you didn't have chemical energy in your body

andrew-mc [135]

According to law of thermodynamics, energy can neither be created nor can be destroyed. It can be converted from one from one form to another.

Hence, the food that we eat is a source of energy. The chemical energy stored in food, is utilized for various function of body such as breathing, walking, talking, etc. Now, if you body does not have chemical energy, if will not be able to perform various task, which are essential for living.

Due to this, <span>absence of chemical energy in the body, can </span>will eventually lead to death.

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3 years ago

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Pleaze help im gonna fail this semester

alexandr1967 [171]

Hydrogen peroxide mixed with vinegar makes peracetic acid, which is a toxic gas that irritates the skin and respiratory system

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3 years ago

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How can you verify that metals conduct electricity and explain​

How can you verify that metals conduct electricity and explain