A student balanced the chemical equation Mg + O2 →MgO by writing Mg + O2 → MgO2. Was the equation balanced correctly? Explain your answer. If the equation was not balanced correctly, write the correctly balanced equation.
Answers
Explanation:
Charges on both magnesium and oxygen is 2. Though opposite in sign, they have equal charges so, both of them will be cancelled by each other.
As a result, formula of magnesium oxide is MgO and not .
The student write the equation as , it is not correct.
Therefore, given equation will be balanced as follows.
Since, number of atoms on both reactant and product side are equal. Hence, this equation is completely balanced.
Final answer:
No, the equation is not balanced correctly. The correct balanced equation is
Explanation:
A balanced chemical equation is a symbolic representation of a chemical reaction that ensures the conservation of mass and charge. It shows the reactants on the left side and the products on the right side, with coefficients indicating the relative quantities of substances involved to satisfy the law of conservation of matter.
The given chemical equation is not balanced correctly. To balance this equation, we need to ensure that there is an equal number of each element on both the reactant and product sides. In the unbalanced equation, there is one magnesium atom on the reactant side and two oxygen atoms on the product side. To balance it, we need to put a coefficient of 2 in front of MgO, resulting in the balanced equation:
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CaSO3 (s) → → → → CaO (s) + SO2 (g) What mass of CaSO3 must have been present initially to produce 14.5 L of SO2 gas at a temperature of 12.5°C and a pressure of 1.10 atm?
Lenses can be found in a variety of objects. Which example does not contain a lens?A. a magnifying glass B. a telescope C. chemical safety goggles D. a microscope
Answers
Answer:
C3H6 + Br2 = C3H6Br2
The product formed is 1,2-dibromopropane.
The red-brown color of the bromine disappears, leaving a colorless liquid
Explanation:
C3H6 + Br2 = C3H6Br2
The product formed is 1,2-dibromopropane.
This is a direct addition reaction. The one molecule of bromine (Br2) joins the organic compound C3H6 to form one molecule of C3H6Br2.
This seemed unlikely at first, but one must look more closely at the C3H6. This is not a straight alkane (e.g., propane). Propane has the formula C3H8:
H3-C-C2-CH3
The molecule C3H6 is propylene (or propene). It has a double bond between two carbons.
H3-CH-CH=CH2
The compound in the question is propylene. When exposed to bromine, the carbon double bond breaks and a bromine atom is attached to each carbon:
H3-CH-CH=CH2 + Br2 = H3-CH-CHBr-CHBr
When propene reacts with bromine, the red-brown color of the bromine is lost and the product is a colorless liquid.
A Energy to break bonds is more than energy release to form bonds
B Energy to break bonds is less than energy release to form bonds
Which type of reaction is represented by B?
Endothermic reaction
Exothermic reaction
Reaction between liquids
Reaction between solids
Answers
Answer:
Reaction B is exothermic
Explanation:
From the context of thermodynamics, chemical reactions can be broadly classified as endothermic and exothermic reactions.
Endothermic reactions involve absorption of energy and show a positive value for the reaction enthalpy i.e. ΔH is positive. In contrast, exothermic reactions are accompanied by the release of energy and show a negative value for the enthalpy change i.e. ΔH is negative.
In a given chemical reaction energy is required to break bonds and it is released during the formation of new bonds.
The Reaction B is such that, the energy required to break bonds is less than energy released during formation bonds. Therefore, since there is a net release of energy, the reaction is exothermic.
Exothermic Reactions
(2) I2(s) ==>I2(l) (4) I2(l)==>I2(s)
Answers
Answer : The correct options is, (1)
Explanation:
(1) :
This reaction shows sublimation process in which the phase changes from solid state to gaseous state at constant temperature.
(2) :
This reaction shows evaporation process in which the phase changes from liquid state to gaseous state at constant temperature.
(3) :
This reaction shows melting process in which the phase changes from solid state to liquid state at constant temperature.
(4) :
This reaction shows freezing process in which the phase changes from liquid state to solid state at constant temperature.
Hence, from this we conclude that the option (1) equation represents sublimation process.
electronegative
valence
ejection
ionization
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Answer:
Ionization energy
Explanation:
Think of it this way: ions are elements with positive or negative charge. If we remove an electron, we give the element a positive charge and it becomes a cation (positive ion). Ionization energy is the energy required to do so - the more electronegative the element, the closer it holds its electrons, the harder they are to remove and the more energy you need.
Answers