All categories

3 years ago

Please help me with my 8th grade chemistry, I'm behind and don't understand it at all

2 answers:

7 0

When a material is heated, the kinetic energy of that material increases and its atoms and molecules move about more. This means that each atom will take up more space due to its movement so the material will expand. ... Some metals expand more than others due to differences in the forces between the atoms / molecules.

love history [14]3 years ago

5 0

determine whether density can be classified as an intensive property. Examples of intensive properties include color, temperature, hardness, and density. In this lab density, the compactness of a substance, will be calculated for aluminum. Then by examining if the density is constant in five trials, which use various amounts of aluminum, the conclusion of whether density is indefinitely an intensive property for solid states of matter can be made.utilize two ionic compounds and facilitate a precipitation reaction in order to observe how the Law of Conservation of Mass applies to chemical processes, specifically, precipitation reactions

]

You might be interested in

What is the boiling point of kerosene

dexar [7]

Answer: The boiling point of kerosene ranges from around 150 to 300 degrees Celsius normally being closer to 300 degrees Celsius.

Explanation:

6 0

3 years ago

Find the boiling point temperature at 760 torr of an isomer of octane, c8h18, if its enthalpy of vaporization is 38,210 j mol-1

mixas84 [53]

According to Clausius-Clayperon equation,

$ln(\frac{P_{1} }{P_{2} }) = \frac{delta H_{vap} }{R} (\frac{1}{T_{2} }-\frac{1}{T_{1} } )$

$P_{1}$ is the vapor pressure at boiling point = 760 torr

$P_{2}$ is the vapor pressure at T_{2} =638.43 torr

Temperature $T_{2} = 110.0^{0}C + 273 = 383 K$

Δ $H_{vap} = 38210 J/mol$

Plugging in the values, we get

$ln(\frac{P_{1} }{P_{2} }) = \frac{delta H_{vap} }{R} (\frac{1}{T_{2} }-\frac{1}{T_{1} } )$

ln $\frac{760 torr}{638.43 torr} =\frac{38210 J/mol}{8.314 J/(mol.K)} (\frac{1}{383 K}-\frac{1}{T_{1} }$

$T_{1} = 389 K$

Therefore, the boiling point of octane = 389 K - 273 = $116^{0}C$

7 0

3 years ago

What is the electron arrangement of K

OverLord2011 [107]

A scale factor is it

5 0

3 years ago

6.9 moles of oxygen gas in a fixed volume of 1.33 liters. One of the valves opened and there remains only 1.24 moles oxygen gas.

Romashka [77]

Answer:

The new volume of the gas remains the same. That is new volume of gas is 1.33 litres

Explanation:

This is because gases do not have a definite shape. They therefore take the shape of their containing vessels and hence their volumes are determined by the volume of the container.

For the question above even if some of the gas escapes, as long as there is gas present in the container, its volume remains the same, that is occupies the same space in the container

7 0

2 years ago

True or false , the viscosity of water is much greater than the viscosity ofhoney.

a_sh-v [17]

False... Honey is greater in velosity then water

4 0

3 years ago

Read 2 more answers