CHEMISTRY HIGH SCHOOL

4.75 mL is the same as 0.00475 L.
True or False

Answers

Answer 1
Answer: True.  1mL equals 1x10⁻³L so to convert mL into L you have to move the decimal point over 3 places to the left.  

I hope this helps.  Let me know in the comments if anything is unclear.

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what is the molarity of a concentrated hbr solution if the solution is 27.7% hbr by mass and has a density of 1.24 g/ml

Answers

The final answer is 4.246 Molar. For a given volume of the solution, let's say 100mL, the following calculations can be made:

Given:
Molar Mass HBr = 80.904g/mol
Density solution = 1.24 g/mL
27.7%(wt/wt) HBr


Total mass of solution = volume(density) = 100mL (1.24 g/mL) = 124 g solution

Mass HBr in solution = 124g(0.277) = 34.348 g HBr

Moles HBr in solution = 34.348/80.904 = 0.4246 moles HBr

Molarity = moles solute/L solution = 0.4246 moles HBr/0.1 L solution
Molarity = 4.246 M

Select all of the answers that apply.A meteorologist predicts fog in the morning over lakes and river bottoms because of the atmospheric conditions and their interactions with the _____.

lithosphere
hydrosphere
biosphere
geosphere

Answers

A meteorologist predicts fog in the morning over lakes and river bottoms because of the atmospheric conditions and their interactions with the hydrosphere. The hydrosphere is the region on the Earth's surface where the total water on the planet is found. The hydrosphere can be in the form of liquid, vapor, or ice.

Which change in oxidation number indicates oxidation?(1) –1 to +2 (3) +2 to –3
(2) –1 to –2 (4) +3 to +2

Answers

The change that shows an oxidation is the change  –1 to +2.

What is oxidation?

The term oxidation has to do with an increase in oxidation number. This increase will always be positive.

Hence, we have to look out for the change in which there is an increase in oxidation number and this occurs for the change –1 to +2.

Learn more about oxidation:brainly.com/question/13110055?

#SPJ2
Oxidation is the loss of electrons (OILRIG, oxidation is loss, reduction is gain), so that would mean a gain in charge (Well from negative to positive). The only one to show charge going up is (1)

A material is ductile, conducts electricity, and is magnetic. The material is a _____. metal nonmetal metalloid impossible to tell

Answers

The answer is metal. Metals are substances generally considered to be good conductors of electricity. They are also considered to be ductile and malleable which means they can be bent or stretched into think wires without breaking. Lastly, some metals like iron, cobalt, and nickel are strongly magnetic. 

the answer your looking for is metal

As you move down group one of the periodic table, what happens to the atomic radii?

Answers

Atomic radius increases down a group, as the distance between the nucleus and the valence electrons increases.

How many grams of nickel 58.69 (No,58.69 g/mol) are in 1.57 moles of nickel

Answers

Answer:

92.1

Explanation:

1.57 * 58.69
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