Answer: Order of the elements from most reactive to least reactive is:
Mg > Zn > Fe > H > Cu
Explanation: Reactivity of the elements is the tendency of the elements to loose or gain electrons with ease.
As, all the given elements are metals, so the metals which will loose electrons easily will be more reactive. To study the reactivity of metals, we use reactivity series.
The metals which are more reactive are placed on the top of the reactivity series and which are less reactive are placed at the bottom.
Hence, the order of the elements from most reactive to least reactive is:
Mg > Zn > Fe > H > Cu
Reactivity series is attached below.
<u>Answer:</u> The for the reaction is 15 kJ.
<u>Explanation:</u>
Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.
According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.
The given chemical reaction follows:
The intermediate balanced chemical reaction are:
(1) ( × 2)
(2)
(3)
The expression for enthalpy of the reaction follows:
Putting values in above equation, we get:
Hence, the for the reaction is 15 kJ.
Density<span> is </span>defined<span> as the ratio between mass and volume or mass per unit volume.
Source is google
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Answer:
what is an element?
element is a pure substance which cannot be broken down by chemical means
what is it represented by?
By its symbol and atomic number
what is it made up off?
It is made up of it's owm type of atom.
Example
carbon,oxygen,hydrogen,gold,silver,iron
Answer:
Explanation:
Hello!
In this case, since the formula for the calculation of molarity is defined in terms of moles and volume in liters as shown below:
Whereas the moles are computed by considering the molar mass of CaCO3 (100.09 g/mol):
Thus, we obtain:
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