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3 years ago

Which is true of ultraviolet rays?

1 answer:

7 0

A is true of UV rays.
B is true not of UV rays but rather of visible light.
C is true not of UV rays but rather of microwaves. (unless you actually toast your toast in a toaster like a normal person)
D is true not of UV rays but rather of radio waves.

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if the half-life of substance A is 1.5 years, how long would it take a 8.0 gram sample of substance A to decay such that only 1.

Fudgin [204]

Answer:

4.5

Explanation:

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3 years ago

In which direction is there a net force of 200 North

zvonat [6]

The answer is "right".

6 0

3 years ago

Read 2 more answers

Jane was drinking a glass of water. She asked her father where the water

Rzqust [24]

Janes brother Jack is actually correct, underground water seeps into little holes or spaces between the soil and the rocks.

<h3>Underground Water</h3>

Simply put, underground water is found in between soils and crack, another name for this is called aquifers were water is found.

It should be noted that underground water are found at varying levels depending the terrain.

Learn more about Underground Water here:

brainly.com/question/23135301

5 0

2 years ago

what is the boiling point of the solution resulted from the dissolving of 32.5g of NaCl in 250.0g of water?

suter [353]

Answer:

The boiling point of this solution is 102.28 °C

Explanation:

<u>Step 1:</u> Data given

Mass of Nacl = 32.5 grams

Molar mass of NaCl = 58.45 g/mol

Mass of Water = 250 grams

Boiling point of water = 100°C

<u>Step 2: </u>Calculate number of moles

Number of moles = mass of NaCl / Molar mass of NaCl

Number of moles = 32.5 grams /58.45 g/mol = 0.556 moles

<u>Step 3:</u> Calculate molality

Molality = Number of moles / mass of water

Molality = 0.556 moles / 0.250 kg of water

Molality = 2.224 molal

NaCl releases twice as many moles of ions, the total molality of this solution is also twice: 4.448 molal

Step 4: Calculate boiling point

dT =( 0.512 C / molal)*4.448 molal)

dT = 2.28

The boiling point of this solution is 100 °C + 2.28 °C = 102.28 °C

8 0

3 years ago

Do electrons fill up the lowest or highest level

OLEGan [10]

The electrons begin at the lowest level, and then fills up until it reaches the highest level, and completely fills the outer shell.

5 0

3 years ago