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Yakvenalex [24]

3 years ago

7

A glass of water sitting in direct sunlight evaporates over time. Explain this phase change in terms of the types of heat transf

er that occur.

1 answer:

dybincka [34]3 years ago

5 0

This is a physical phase change it is still water it just separated and became less and less.it stays water though

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Luca wants to identify and quantity the chemicals causing air pollution in a city, but he is using a manual air sampler to colle

xenn [34]

Answer

Manual samplers are prone to effects of temperature, speed of wind and air concentrations.

Explanation

Manual samplers face several challenges that can act as drawbacks to obtaining accurate results. They are subjected to effects of sampling duration where long sampling times are needed to obtain adequate mass for detection. Manual samplers face challenges when measuring non-volatile species because particles are observed into the adsorption medium at a slower rate of diffusion.

5 0

3 years ago

To find the number of neutrons in a atom, you subtract the number of_____ from the mass number.

Slav-nsk [51]

You can simply subtract the atomic number from the mass number in order to find the number of neutrons.

8 0

2 years ago

Read 2 more answers

George has a mass of 65kg. What would George weigh on the Moon? (The gravitational field strength on the Moon is 1.6N/kg.)

dem82 [27]

Answer:

$\boxed{\large \text{104 N}}$

Explanation:

$\text{Weight} = \text{65 kg} \times \dfrac{\text{1.6 N}}{\text{1 kg}} = \textbf{104 N}\\\\\text{George would weigh $\boxed{\large \textbf{104 N}}$ on the moon}$

5 0

2 years ago

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The image below shows two nitrogen atoms. For these two atoms to form a stable molecule, N2, how many electrons would have to be

maxonik [38]

There are six electrons in the covalent bonds.

Two N atoms would be :N:· + ·:N:
An N₂ molecule would be :N:::N: or :N≡N:
This gives each N atom an octet of eight electrons in its valence shell.

7 0

3 years ago

Calculate the molality of 75.0 grams of MgCl2 (molar mass=95.21 g/mol) dissolved in 500.0 g of solvent.

nordsb [41]

<u>Answer:</u> The molality of magnesium chloride is 1.58 m

<u>Explanation:</u>

To calculate the molality of solution, we use the equation:

$\text{Molality}=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ (in grams)}}$

Where,

$m_{solute}$ = Given mass of solute (magnesium chloride) = 75.0

$M_{solute}$ = Molar mass of solute (magnesium chloride) = 95.21 g/mol

$W_{solvent}$ = Mass of solvent = 500.0 g

Putting values in above equation, we get:

$\text{Molality of }MgCl_2=\frac{75.0\times 1000}{95.21\times 500.0}\\\\\text{Molality of }MgCl_2=1.58m$

Hence, the molality of magnesium chloride is 1.58 m

5 0

3 years ago

Read 2 more answers