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ddd [48]
3 years ago
7

Please help. I will post another sheet because I need help, thanks!

Chemistry
1 answer:
Sliva [168]3 years ago
8 0
The last one will be It's better to use the average data instead of the single trail because the average you don't have to multiply add subtract and all that nonsense but if you use the single trail you will have to do all the adding multiplying etc.
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Sodium (na), atomic number 11, has a tendency to lose an electron in the presence of chlorine. after losing the electron, na has
Paha777 [63]
Eleven because protons don’t leave.
3 0
3 years ago
For every 4 hours that Alexa babysit her younger sister, her mom pays her $50
tiny-mole [99]

Answer:12.5

Explanation: Divide 50$ by the 4 hours and you will get 12.5 which is $12.50.

7 0
2 years ago
Read 2 more answers
1) Click the orange button to "Break Bonds." What is needed in order to break a<br> chemical bond?
Valentin [98]
Energy is always required
3 0
3 years ago
Typically, the hydrogen gas is bubbled through water for col- lection and becomes saturated with water vapor. Suppose 240. mL of
klio [65]

Answer:PH2=0.994atm, mass of zinc=0.606g

Explanation:

Equation for the reaction is written as;

Zn(s) + 2HCl(aq) - ZnCl2(aq) + H2(g)

V= 240ml = 0.240L

T= 30.8oC = 303.8K

Ptotal= 1.036atm

Pwater = 32mmHg at 30oC = 0.042atm

Therefore

PH2 = Ptotal - Pwater

= 1.036-0.042atm

=0.994atm

But PV= nRT

n = PV/RT

= 0.994x0.240/0.0821x303.8

= 0.24/24.94

=0.009324moles

For the grams of zinc

n=mass in grams/molar mass

Mass in grams = no of moles x molar mass

=0.009324x65 = 0.606g

3 0
3 years ago
Decane (C10H22) used to produce poly(ethene). what conditions are needed?
Strike441 [17]

<span>Cracking of hydrocarbons involves thermal decomposition.
This means that large hydrocarbon molecules break into
smaller molecules when they are heated. The <span>hydrocarbons
</span>are boiled and the <span>hydrocarbon gases </span>are either
mixed with steam and heated to a very high temperature or
passed over a hot <span>powdered </span>aluminium oxide catalyst.
The catalyst works by providing the <span>hydrocarbon gases
</span>with a convenient surface for the cracking to take place.</span>

<span>For example, decane (an alkane with 10 carbons)
can be cracked to produce octane and ethene.</span>

decane<span>             octane    +   ethene.
<span>C10H22</span>(g)          <span>C8H18</span>(g)  +   C2<span>H4</span>(g)</span>

<span>Octane is used as petrol.
Ethene is used in the manufacture of polymers.</span>

<span>Cracking an alkane produces a smaller alkane plus an alkene.
If you add up the number of hydrogen atoms in the
above reaction, you will see that there are 22 on each side.
An alkene is produced because the original alkane does
<span>not </span>have enough hydrogen atoms to produce two more<span> alkanes</span>.</span>

<span>
</span>

<span>hope this helps </span>

6 0
2 years ago
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