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weqwewe [10]
2 years ago
14

When Pb and AlCl3 react together, lead (Pb) can replace aluminum (Al) in the compound because lead is lower on the activity seri

es. T/F
Chemistry
2 answers:
Andre45 [30]2 years ago
8 0
False. Pb is lower than Al in the reactivity series. It cannot replace aluminium in AlCl3
jeka57 [31]2 years ago
3 0

<u>Answer:</u> The correct answer is False.

<u>Explanation:</u>

Single displacement reactions are defined as the reactions in which more reactive element replaces a less reactive element from its chemical reaction.

A+BC\rightarrow AC+B

A is more reactive element than reactive B.

The reactivity of metals is judged by the series known as reactivity series. Elements lying above in the series are more reactive than the elements lying below in the series.

For the reaction between lead and aluminium chloride, the reaction does not take place because lead lies below in the reactivity series than aluminium. Hence, lead cannot displace aluminium from its chemical reaction.

Pb+AlCl_3\rightarrow \text{No reaction}

Hence, the correct answer is False.

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A sample of lemon juice is found to have a pH of 2.3. What is the concentration of hydrogen ions in the lemon juice?
Elenna [48]

Answer: It's equal to 10^(-2.3), or 0.00501 M, or 5.01 * 10^-3 moles/Liter

Explanation:

Well, pH = - log[H+]

Or, in words, pH is equal to -1 multiplied by the logarithm (base 10) of the hydrogen ion concentration.   So you have 2.3 = -log[H+].    We want to isolate the H+, so let's start simplifying the right hand side of the equation. First, we multiply both sides by -1.   -2.3=log[H+]   Now, the definition of a logarithm says that if the log (base 10) of [H+] is -2.3, then 10 raised to the -2.3 power is [H+]   So on each side of the equation, we raise 10 to the power of that side of the equation.   10^(-2.3) = 10^(log[H+])   and because 10^log cancels out...   10^(-2.3) = [H+]   Now we've solved for [H+], the hydrogen ion concentration!

7 0
3 years ago
Complex chemical catalysts produced by living cells are called enzymes. true false
SIZIF [17.4K]
True 
Enzymes help the body in digestion and other bodily functions which involve chemicals.
7 0
3 years ago
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ASAP someone help ASAP
Sonbull [250]

sunlimation is when a solid goes to a gas thats all i can awnser i havent got that far in chemistry yet.

4 0
3 years ago
B. If the sand you ran across has a specific-heat capacity of 835 J/(kgºc),
Murrr4er [49]

Answer: 16700 Joules

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

Q=m\times c\times \Delta T

Q = Heat absorbed = ?

m = mass of sand = 2 kg

c = heat capacity = 835J/kg^0C

Initial temperature  = T_i = 40^0C

Final temperature= T_f  = 50^0C

Change in temperature ,\Delta T=T_f-T_i=(50-40)^0C=10^0C

Putting in the values, we get:

Q=2kg\times 835J/kg^0C\times 10^0C

Q=16700J

16700 J of energy must be added to a 2-kilogram pile of it to increase its temperature from 40°C to 50°C

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2 years ago
Which of these activities performed by a chemist is primarily based on an understanding of physics?
Ilia_Sergeevich [38]
<span>predicting the boiling point of a liquid, given its pressure</span>
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3 years ago
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