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3 years ago

At night, there is a drop in the amount of ozone in the upper atmosphere. Why does this drop occur?

1 answer:

4 0

Ozone transforms back to oxygen pretty readily and quickly. thus, unless sunlight is present to make new ozone, the ozone level decreases.
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The elements in valence group 5 have how many valence electrons?

Viefleur [7K]

Answer:

5 valence electron

Explanation:

It is because the group number is equal to the valence electron.

6 0

3 years ago

Use the Gizmo to mix 200 g of copper at 100 °C with 1,000 g of water at 20 °C. Record the data and calculated answers for copper

xxTIMURxx [149]

Answer:

Explanation:Use the Gizmo to mix 200 g of copper at 100 °C with 1,000 g of water at 20 °C. Record the data and calculated answers for copper in the 2 tables below. Accepted values for % error calculations can be found below these 2 tables.

DATA

Copper

Lead

Mass of Metal

3 0

3 years ago

A silver bar has a mass of 368g. What is the volume in cm³ of the bar? The density of silver is 19.5g/cm³.

BabaBlast [244]

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density} \\$

From the question we have

$volume = \frac{368}{19.5} \\ = 18.871794..$

We have the final answer as

Hope this helps you

4 0

3 years ago

Weather balloons carry instruments that can gather data about Earth’s atmosphere. On the ground, a weather balloon has a volume

Digiron [165]

Answer: 263 L

Explanation:

just answered it on edgu

4 0

3 years ago

Calculate the percent yield if 52.9 g of ethanol reacts to produce 26.7 g of ether.

blagie [28]

Answer:

The % yield is 62.7 %

Explanation:

<u>Step 1:</u> the balanced equation

2CH3CH2OH(l) → CH3CH2OCH2CH3(l) + H2O(l)

<u>Step 2:</u> Data given

mass of ethanol = 52.9 grams

molar mass of ethanol = 46.07 g/mol

mass of ether = 26.7 grams

Molar mass of ether = 74.12 g/mol

<u>Step 3:</u> Calculate moles of ethanol

Number of moles = Mass / molar mass

Moles of ethanol = 52.9 grams / 46.07 g/mol

Moles of ethanol = 1.15 moles

<u>Step 4: </u>Calculate moles of ether

For 2 moles of ethanol consumed, we have 1 mole of ether produced

For 1.15 moles of ethanol consumed, we have 1.15/2 = 0.575 moles of ether produced

<u>Step 5:</u> Calculate mass of ether

Mass = moles * Molar mass

Mass ether = 0.575 moles * 74.12 g/mol = 42.62 grams = theoretical yield

<u>Step 6:</u> Calculate % yield

% yield = (26.7 / 42.62) * 100 = 62.7%

The % yield is 62.7 %

6 0

4 years ago