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3 years ago

Helium does not usually react with other substances. Does this mean that helium has no chemical properties? Explain.

1 answer:

3 0

Everything has chemical properties it depends on the reactivity and the reactivity of the other element and what form it is in

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What sort of fossils would be expected to be found in Antarctica from more recent times, after it had moved much closer to the S

olga nikolaevna [1]

Answer:

Antarctic Peninsula, is one of the most important fossil sites on Earth.

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3 years ago

Low air pressure can cause

ohaa [14]

Answer: clouds and precipitation to form

Explanation: In a low pressure system warm air rises into the atmosphere and cools down and forms cloud. In low air pressure the humidity is high since there is enough space for water vapor to occupy causing precipitation.

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2 years ago

You are given a cube with the length of 2.5 cm , a width of 2.5 cm , and a height of 2.5 cm. You place it on the scale, and its

kakasveta [241]

Density is equal to the mass divided by the voulme.
So: 2.5 multiplied by 2.5 by 2.5.
Then: 295 divided by 16.625=18.88g/cm to the power 3

8 0

3 years ago

A 100.0g sample of tin is heated to 100.0 oC (Celsius) and is placed in a coffee cup calorimeter containing 150. g of water at 2

Snowcat [4.5K]

Explanation:

It is known that specific heat of water is 4.184 $J/g^{o}C$ and atomic mass of tin is 118.7 g/mol. For the given situation,

$Q_{lost} = Q_{gained}$

Let us assume that,

$m_{1}$ = mass of Sn

$m_{2}$ = mass of $H_{2}O$

Therefore, heat energy expression for heat lost and gained is as follows.

$Q_{lost} = Q_{gained}$

$m_{1}C_{1}(T_{2} - T_{1}) = m_{2}C_{2}(T_{1} - T_{2})$

$100 g \times C_{1} \times (100^{o}C - 27.4^{o}C) = 150 g \times 4.184 /g^{o}C \times (27.4^{o}C - 25^{o}C)$

$7260C_{1} = 150 \times 4.184 \times 2.4$

$C_{1} = \frac{1506.24}{7260}$

= 0.207 $J/g^{o}C$

For, 118.7 g the specific heat of tin will be calculated as follows.

$C_{1} = 0.207 J/g^{o}C \times 118.7 g$

= 24.5 $J/mol^{o}C$

Thus, we can conclude that specific heat of tin is 24.5 $J/mol^{o}C$ .

3 0

3 years ago

Molar mass of acetone(CH3COCH3)

ladessa [460]

58.08 g/mol

Formula: C3H6O
Melting point: -139°F (-95°C)
Density: 784 kg/m³

6 0

3 years ago

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