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3 years ago

Pleaseee, PLEASEEEEEE I need HELPP with this

Chemistry

2 answers:

weqwewe [10]3 years ago

4 0

The pictures to the right show two samples of substance X. Answer the questions below about the intensive and extensive properties of substance X. You may assume that both cubes are solid (that is, not hollow inside).

Sample A melts at the same temperature as sample B.

Sample B has a larger mass than sample A.

Sample A has a smaller volume than sample B.

If sample A floats in water, sample B . will also float in water

If sample B is attracted to a magnet, sample A will also be attracted to a magnet.

Savatey [412]3 years ago

3 0

Explanation:

Melting is defined as a change in which a solid changes into liquid state.

For example, an ice cube will melt at room temperature whereas a large ice block will also melt at room temperature.

Therefore, sample A melts at the same temperature as sample B.

Since sample A is small in size whereas sample B is larger in size. Hence, sample B has a larger mass than sample A. Also, sample A has smaller volume than sample B.

On the other hand, floating ability of a substance depends on its density. Therefore, being sample of same substance if sample A floats in water then sample B will also float in water.

Also, it is given that sample B is attracted to a magnet therefore, sample A will also be attracted to a magnet.

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The end of one bar magnet is placed near the end of another bar magnet. The two ends seem to push each other apart. Which of the

rosijanka [135]

Answer:

A.The two ends are like poles

Explanation:

Magnets are composed of a north pole and a south pole. If two like poles of a magnetic are placed near each other, the two ends seem to push apart.

The reason for this is that, when like poles of two magnets are made to face each other, the lines of forces are in opposite directions, hence the magnets repel.

If unlike poles of two bar magnets are made to face each other, the magnetic lines of force are now in the same direction therefore the unlike poles attract each other.

5 0

3 years ago

A helium-filled balloon at 310.0 K and 1 atm, contains 0.05 g He, and has a volume of 1.21 L. It is placed in a freezer (T = 235

trapecia [35]

Answer : The value of $\Delta E$ of the gas is 2.79 Joules.

Explanation :

First we have to calculate the moles of helium.

$\text{Moles of helium}=\frac{\text{Mass of helium}}{\text{Molar mass of helium}}$

Molar mass of helium = 4 g/mole

$\text{Moles of helium}=\frac{0.05g}{4g/mole}=0.0125mole$

Now we have to calculate the heat.

Formula used :

$q=nc_p\Delta T\\\\q=nc_p(T_2-T_1)$

where,

q = heat

n = number of moles of helium gas = 0.0125 mole

$c_p$ = specific heat of helium = 20.8 J/mol.K

$T_1$ = initial temperature = 310.0 K

$T_2$ = final temperature = 235.0 K

Now put all the given values in the above formula, we get:

$q=nc_p(T_2-T_1)$

$q=(0.0125mole)\times (20.8J/mol.K)\times (235.0-310.0)K$

$q=-19.5J$

Now we have top calculate the work done.

Formula used :

$w=-p\Delta V\\\\w=-p(V_2-V_1)$

where,

w = work done

p = pressure of the gas = 1 atm

$V_1$ = initial volume = 1.21 L

$V_2$ = final volume = 0.99 L

Now put all the given values in the above formula, we get:

$w=-p(V_2-V_1)$

$w=-(1atm)\times (0.99-1.21)L$

$w=0.22L.artm=0.22\times 101.3J=22.29J$

conversion used : (1 L.atm = 101.3 J)

Now we have to calculate the value of $\Delta E$ of the gas.

$\Delta E=q+w$

$\Delta E=(-19.5J)+22.29J$

$\Delta E=2.79J$

Therefore, the value of $\Delta E$ of the gas is 2.79 Joules.

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3 years ago

In a solution, solute and solvent exist in the same _________________.

Ne4ueva [31]

Answer:phase

Explanation:

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3 years ago

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What is the net force acting on a golf car travelling at constant speed of 5 mph

Brilliant_brown [7]

The answer is 0 Newtons

This is because of a key word in the question: “constant”

When we say something has a constant speed, that means that its acceleration is 0.

Using the equation derived for Newton’s 2nd law, we see that F=ma

Force = mass x acceleration

If acceleration, a, equals 0, then when we multiply our mass times acceleration 0

F=m(0)

Anything times zero equals zero

So, F=0

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3 years ago

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I am Lyosha [343]

Answer:

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2 years ago

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