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victus00 [196]
3 years ago
7

What is an element in science

Chemistry
2 answers:
s2008m [1.1K]3 years ago
5 0
An element is <span>a part or aspect of something abstract, especially one that is essential or characteristic. I hope this helps you good luck :)</span>
ANTONII [103]3 years ago
4 0
A simple substance that can not be broken down
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n the space below, briefly explain why the average times for the two CO2 molecules you calculated should have been similar (or a
brilliants [131]

Answer:

See explaination

Explanation:

No, the neurons don't use diffusion to transfer messages rather they employ the use of electrical impulses which are very fast for example, if we drop something accidentally on our foot we immediately move back to prevent ourselves from injury this quick reaction is possible because the signals are transferred in the form of electrical impulses.If diffusion was there to transfer the message then it would have taken very long time and our foot would have been bleeding too as diffusion process is relatively much slower.

This is due to collision of CO2 molecule with other molecules of CO2 and vander vals interaction between them which results in slow down of CO2 molecule and the CO2 molecules also collide with walls of leaf as well which also decreases the speed of CO2 molecule resulting it in taking more time.

3 0
3 years ago
What is the volume of 0.80 grams of O2 gas at STP?
frez [133]

Answer:

The volume of 0.80 grams of O2 is 0.56 L

Explanation:

Step 1 : Data given

Mass of O2 = 0.80 grams

Molar mass of O2 = 32 g/mol

STP = 1 mol, 1atm, 22.4 L

Step 2: Calculate moles of oxygen

Moles of O2 = Mass of O2 / molar mass of O2

Moles O2 = 0.80 grams / 32 g/mol

Moles O2 = 0.025 moles

Step 3: Calculate volume of O2

1 mol = 22.4 L of gas

0.025 moles = 0.025*22.4L = 0.56 L

The volume of 0.80 grams of O2 is 0.56 L

5 0
3 years ago
Read 2 more answers
A mixture of sodium hydroxide and strontium hydroxide contains a total of 0.19 moles of the two compounds. It requires 100.0 mL
9966 [12]

Answer:

0.0831 moles of NaOH were in the original mixture

Explanation:

The strontium hydroxide, Sr(OH)2, requires 2 moles of HCl per mole of hydroxide to be neutralized.

The sodium hydroxide, NaOH, requires 1 mol of HCl per mol of hydroxide.

To solve this question we must write 2 equations:

<em>(1) </em>0.19mol = X + Y

<em>Where X = Moles NaOH; Y = Moles Sr(OH)2</em>

The moles of HCl required are:

0.100L * (2.969mol / L) = 0.2969 moles HCl

0.2969 mol = X + 2Y<em>(2)</em>

Replacing (1) in (2):

0.19mol - Y = X

0.2969 mol = (0.19mol - Y) + 2Y

0.1069mol = Y

Moles X = Moles NaOH:

0.19mol = X + 0.1069mol

X = 0.0831 moles of NaOH were in the original mixture

7 0
3 years ago
512,420,000 in scientific notation
klemol [59]
The answer is 5.1242x10^8
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2 years ago
The electrons in the outermost energy level are responsible for the atoms _____. These electrons are called the _______ electron
RideAnS [48]
It’s in google! You’ll find it there
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