Formula for the compound that contains Mg2+ and O2-
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Answer:
MgO.
Explanation:
charges of both satisfy one another (balanced) -- producing a compound MgO.
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2. Explain how conduction, convection and radiation all contribute to heating the Earth'ssurface and atmosphere.
A 55.0 g piece of iron at 505 ° C is put into 735 grams of water at 15.0 ° C. What is the final temperature of the water and the iron?
How much heat is given off when 8 g of hydrogen reacts in: 2H₂ + O₂ → 2H₂O; ΔH = -115.60 kcala. -57.8 kcal b. -115.6 kcal c. -173.4 kcal d. -231.2 kcal e. -462.4 kcal
b) 24
c) 42
d) 10
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The GPS or global positioning system is a satellite – based navigation system made up of a network of 24 satellites placed into orbit by the US Department of Defense. It was originally intended for military applications but later one, it made available for civilian use. It works in any weather conditions, anywhere in the world for 24 hours a day.
(B) lattice energy
(C) kinetic energy
(D) activation energy
(E) ionization energy
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collect more data to support their hypothesis
The Scientific Method is made up of steps scientists take to draw a conclusion
Step 1: Form a Question
Step 2: Research the Question
Step 3: Form a Hypothesis (educated guess)
Step 4: Conduct an Experiment (use quantitative and qualitative data)
Step 5: Form Your Conclusion Based on Results
This should help....
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Answer:
Molarity of HCl = 0.3333M
Explanation:
Given:
Volume of HCl = 15.00 ml
Volume of NaOH = 25.00 ml
Molarity of NaOH = 0.2000 M
To determine:
Molarity of HCl
Explanation:
The titration reaction is:
Based on the reaction stoichiometry:
1 mole of HCl reacts with 1 mole of NaOH to form 1 mole of NaCl and water.
Therefore the molar ratio of HCl:NaOH = 1:1
Moles of NaOH consumed = Moles of HCl present = 0.005 moles
HCl+NaOH -> NaCl + H2O
1:1 ratio
M1=Molarity of HCl = X
V1 = Volume of HCl = 15mL = 0.015L
M2 = Molarity of NaOH = 0.2M
V2 = Volume of NaOh = 25mL = 0.025L
(XM)(0.015L)=(0.2M)(0.025L)
Isolate unknown:
(XM)=[(0.2M)(0.025L)/(0.015L)]
XM=0.33M
Hence, Molarity of HCl is = 0.33 Moles
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Answer: Five and Six
Explanation: In nature, usually we can observe the rings with 5 or 6 carbon atoms are most abundant.
First of all, the rings with 5 or 6 carbon atoms are the most stable rings which are not affected by any free energy factor or enthalpy factor or entropy factor.
Moreover 6 membered rings are found to be the most stable ones because of the extra stability provided by the term known as Aromaticity like Benzne is known to be most stable and most aromatic compound.
5 membered rings are found in our body as ribose sugar which makes the important nucleic acids which are RNA (ribose nucleic acids)and DNA(de oxyribose nucleic acids) .
(2) AgNO3(aq) + KCl(aq) =>AgCl(s) + KNO3(aq)
(3) HCl(aq) + NaOH(aq) =>NaCl(aq) + H2O(l)
(4) H3O+(aq) + OH-(aq) => 2H=O(l)
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Answer : The correct reaction is, (1)
Explanation :
(1)
In this reaction, the oxidation state of calcium (Ca) changes from (0) to (+2) and the oxidation state of oxygen (O) changes from (0) to (-2). In this reaction the electrons are transferred from one reactant (calcium) to another reactant (oxygen). This is a synthesis reaction.
(2)
In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a double-displacement reaction.
(3)
In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a neutralization reaction.
(4)
In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a combination reaction.
Hence, the correct reaction is, (1) in which the electrons transferred from one reactant to another reactant.