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Leno4ka [110]
3 years ago
10

How do astronomers know about the future collision of Andromeda and the Milky Way?

Chemistry
1 answer:
Andrej [43]3 years ago
8 0

Answer:

c

Explanation:

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What does the reaction rate measure?
scoundrel [369]

Answer:

It's C

Explanation:

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3 years ago
One mole of a metallic oxide reacts with one mole of hydrogen to produce two moles of the pure metal
WARRIOR [948]

Answer:

Lithium oxide, Li₂O.  

Explanation:

Hello!  

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

M_2O+H_2\rightarrow 2M+H_2O  

Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:

5.00gM_2O*\frac{1molM_2O}{(2*X+16)gM_2O}*\frac{2molM}{1molM_2O}*\frac{XgM}{1molM}=2.32gM  

Thus, we perform the operations in order to obtain:

\frac{10X}{(2X+16)}=2.32  

So we solve for x as shown below:

10X=2.32(2X+16)\\\\10X=4.64X+37.12\\\\X=\frac{37.12}{10-4.64}\\\\X= 6.93g/mol  

Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.  

Best regards!

8 0
3 years ago
Which metal will more easily lose an electron sodium or potassium?
sergey [27]
<span>The metal that would more easily lose an electron would be potassium. It is more reactive than sodium. Also, looking on the periodic table, </span><span>from top to bottom for groups 1 and 2, reactivity increases. So, it should be potassium. Hope this answers the question. Have a nice day.</span>
7 0
4 years ago
Which procedure could a student use to examine an intensive property of a rectangular block of wood?
PolarNik [594]
The formula they can use is Length multiplied by Width Multiplied by Height
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What is the enthalpy for reaction 1 reversed? reaction 1 reversed: co2→co + 12o2?
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<span>Answer: CO2→CO + 12O2 is not a balanced reaction, I think you meant to post " CO2→CO + 1/2O2" The simple answer is that the enthalphy for reaction 1 reversed is the same enthalpy as for the reaction as written but with the opposite sign. If A + B = AB with 30 kJ released then AB = A + B with 30 kJ absorbed. We would write it as A + B = AB heat of reaction = -30 kJ AB = A + B heat of reaction = +30 kJ</span>
7 0
3 years ago
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