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Mashutka [201]
3 years ago
7

Jeff wants to record the diameter of a long, thin wire using an instrument. Which of the following instruments should be use? A

Altimeter B Microscope c Measuring scale D.Micrometer​
Chemistry
1 answer:
lapo4ka [179]3 years ago
4 0

Answer:

D

Explanation:

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Given the equation Ca + H2O --> Ca(OH)2 + H2 how many grams of calcium will react completely with 10.0 grams of water? *
Yuki888 [10]

Answer: 11.0 g of calcium will react with 10.0 grams of water.

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

moles of H_2O

\text{Number of moles}=\frac{10.0g}{18g/mol}=0.55moles

The balanced chemical equation is:

Ca+2H_2O\rightarrow Ca(OH)_2+H_2

According to stoichiometry :

2 moles of H_2O require = 1 mole of Ca

Thus 0.55 moles of H_2O require=\frac{1}{2}\times 0.55=0.275moles  of Ca  

Mass of Ca=moles\times {\text {Molar mass}}=0.275moles\times 40g/mol=11g

Thus 11.0 g of calcium will react with 10.0 grams of water.

3 0
3 years ago
Which is a positive effect of the technology advance of going from a compass to a gps
egoroff_w [7]

Answer:

Compass - Gps                              

Explanation:

I belive the pro's                                      and cons are

                                         GPS             you are trusting a little man made device

the direction you                               to give you directions

are going on                                        and that it won't break or die

a device not a paper map

                                                Compass

You can see north east south and              it is usually carefully crafted for                                                                                                                                                                          o                                                                     outdoors but it has no roads and

west on the compass and                          if given no directions, extremely

you can see the roads follow directions                  confusing until you learn it

like go south then east.

4 0
3 years ago
A welding tank of oxygen gas has a volume of 100. L. The oxygen in the tank is at a pressure of 95 atm and a temperature of 30.
Anuta_ua [19.1K]

Answer:

blah blah blah blah blah blah blah blah blah blah blah

5 0
4 years ago
Help please I’ll mark as brainiliest
fredd [130]

Answer:

         B             B

W      BW          BW        

W       BW          BW

Explanation:

Hope this helps

8 0
3 years ago
Ignore this!<br><br>i got the answer already haha
marta [7]

Answer:

okay lol, ima use this for points if okay

Explanation:

5 0
3 years ago
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