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3 years ago

What additional tests would be needed to establish the exact position of hydrogen?

2 answers:

5 0

The question above is incomplete, the full question is given below:
What additional test would be needed to establish the exact position of hydrogen in the activity series of the following elements: magnesium, zinc, lead, copper and silver.

ANSWER
The position of hydrogen on a reactivity series can be determined by its ability to displace oxygen from the oxide of the metal concerned. If hydrogen is more reactive than a metal, it will displace oxygen from the metal oxide and reduce the metal oxide to its metal. If the metal is more reactive than hydrogen, hydrogen will not be able to reduce the metal oxide to its metal.

rusak2 [61]3 years ago

5 0

Hydrogen is a tricky one due because
1. It has one electron.
2. Because of it having one electron and or tibial theory it is only half a shell due.

With hydrogen have one electron in its outer shell and it's being half full for it to become stable, it can either gain one electron to have a full shell or it can easily lose an electron, though the shell is at its lowest energy level.
Under the right condition, Hydrogen can react as a cation and an anion.

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3) A certain reaction has the following general form: A + B à AB At a particular temperature the concentration versus time were

seropon [69]

Answer:

a. First order.

b. $k=3.7x10^{-3}s ^{-1}$

c. $t_{1/2}=187.3s$

d. $[A]=0.111M$

Explanation:

Hello.

a. In this case since the slope is in s⁻¹ we can infer that the lineal form of the rate law is:

$ln[A]=-kt+ln[A]_0$

Which is also:

$y=mx+b$

It means that the reaction is first-order as slope equals the negative of the rate constant which also has units of first-oder reaction.

b. Since the slope is −3.7 x 10−3 s−1 the rate constant is:

$k=-m\\\\k=-(-3.7x10^{-3}s ^{-1})\\\\k=3.7x10^{-3}s ^{-1}$

c. For first-order reactions, the half-life is:

$t_{1/2}=\frac{ln(2)}{k}\\ \\t_{1/2}=\frac{ln(2)}{3.7x10^{-3}s^{-1}}\\\\t_{1/2}=187.3s$

d. In this case, since the integrated first-order rate law is:

$[A]=[A]_0exp(-kt)$

The concentration once 220 seconds have passed is:

$[A]=0.250Mexp(-3.7x10^{-3}s^{-1}*220s)\\\\$

$[A]=0.111M$

Regards.

7 0

4 years ago

HOW DOES ENERGY FROM THE SUN ULTIMATELY CAUSE THE BLADES ON THESE WIND TURBINES TO MOVE?

Anarel [89]

Energy in wind comes from the sun. for example, when the Earth’s surface absorbs the suns energy, it turns to heat. wind is produced by uneven heating from the earths surface by the sun. Since the earth's surface is made of various land and water formations, it absorbs the sun's radiation unevenly. The blades on the wind turbine move from the wind. i hope that made sense, if it didn’t i’m sorry, i hoped that hep though!

6 0

3 years ago

What is the volume of 12.0 grams of oxygen gas at STP Atomic mass:O = 15.99 grams/moles

strojnjashka [21]

Answer:

16.82 L.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = 1.0 atm, STP conditions).

V is the volume of the gas in L (V = ??? L).

n is the no. of moles of the gas in mol (n = mass/molar mass = (12.0 g)/(15.99 g/mol) = 0.7505 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 0.0°C + 273 = 273.0 K, STP conditions).

∴ V = nRT/P = (0.7505 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 16.82 L.

6 0

4 years ago

In the following list, only ________ is not an example of a chemical reaction. the production of hydrogen gas from water the tar

Vika [28.1K]

Answer: Option (c) is the correct answer.

Explanation:

A chemical reaction is defined as the reaction where a chemical bond will break in order to form a new bond due to the formation of a new substance.

For example, $2Na + Cl_{2} \rightarrow 2NaCl$

Here, NaCl is the new substance that is formed. A chemical reaction will always bring change in chemical composition of a substance.

The production of hydrogen gas from water, the tarnishing of a copper penny, charging a cellular phone and burning a plastic water bottle are all chemical reactions.

Whereas a reaction where no change in chemical composition of a substance takes place is known as a physical reaction.

For example, chopping a log into sawdust will change the shape but it will not bring any change in chemical composition of the substance.

Thus, we can conclude that in the following list, only chopping a log into sawdust is not an example of a chemical reaction.

8 0

3 years ago

If the Earth had no tilt, how would that affect our seasons? I will give branliest to first comment

Aleks [24]

Answer:

in my opinion it wouldn't be regular seasons like what we have now it would be equal in every poles .. there would not be ice in North. [its my opinion though] sorry if I am wrong

6 0

3 years ago