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Masteriza [31]
3 years ago
11

This element is a gas at room temp, and we breathe it to survive. It has 8 protons

Chemistry
2 answers:
Ugo [173]3 years ago
4 0
Answer: Oxygen

Oxygen is atomic number 8 on the periodic table, which means that it has 8 protons. It is a gas.
Vesnalui [34]3 years ago
3 0

Answer:

\boxed{ \bold{ \huge{ \boxed{ \sf{oxygen}}}}}

Explanation:

Oxygen is used by living beings for the oxidation of food or glucose to produce energy during respiration. It has 8 protons and 8 neutrons.

Hope I helped!

Best regards! :D

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What further observation led mendeleev to create the periodic table
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Answer:

;,knbbbknnbkhbln bhbj k; b; m j

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5 0
3 years ago
A reaction produces 74.10 g Ca(OH)2 after 56.08 g CaO is added to 36.04 g H2O. How should the difference in the masses of reacta
melomori [17]
Cao +  H2O  ---->Ca(OH)2
Calculate   the  number  of  each   reactant  and  the  moles  of  the  product
that  is
moles = mass/molar mass
The  moles  of  CaO=  56.08g/  56.08g/mol(molar  mass  of  Cao)=  1mole
the  moles  of  water=  36.04 g/18  g/mol=  2.002moles
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 The  mass  of differences  of  reactant  and  product  can   be  therefore 
 explained  as 
 1  mole   of  Cao  reacted  completely   with   1  mole   H2O  to  produce  1 mole  of  Ca(OH)2. The  mass  of  water   was  in  excess  while  that  of  CaO  was  limited

3 0
3 years ago
Using your own words define a scientific law
OleMash [197]
A scientific law is a statement that is universally accepted and answers the "how?" question.

Hope this helps!
4 0
3 years ago
The half-life of a pesticide determines its persistence in the environment. A common pesticide degrades in a first-order process
denis23 [38]

Answer:

0.1066 hours

Explanation:

A common pesticide degrades in a first-order process with a rate constant (k) of 6.5 1/hours. We can calculate its half-life (t1/2), that is, the times that it takes for its concentration to be halved, using the following expression.

t1/2 = ln2/k

t1/2 = ln2/6.5 h⁻¹

t1/2 = 0.1066 h

The half-life of the pesticide is 0.1066 hours.

7 0
3 years ago
Which of the following is part of photosynthesis, but not part of cellular respiration?
Licemer1 [7]

Answer:

A

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  • plants need sunlight to eat. so that's why

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