If two atoms** have the same number of protons, they are the same element. They have the same atomic number. The only thing that would change with the number of neutrons is the mass number.
Answer:
a) Step 1:
Step 2:
b) The overall balanced reaction for given process is ;
Explanation:
a)
Galena =
Lead(II) oxide =
Sulfur dioxide =
Step 1:
Roasting the galena in oxygen gas to form lead(II) oxide and sulfur dioxide.
Balanced equation of step 1:
..[1]
Step 2:
Heating the metal oxide with more galena forms the molten metal and more sulfur dioxide.
Balanced equation of step 2:
..[2]
b)
For over all reaction add [1] and [2]. The overall balanced reaction for given process is ;
D.
The water must be heated and removed in distillation, so thermal energy is required.
When building a bridge, engineers want the bridge cables to have great:
- Tensile strength has to do with the amount of stress that a thing is able to resist without breaking under legthwise stress.
- This is measured by the largest load (kg) per unit area as it refers to the amount of stress an object or material is <u>able to endure</u> without tearing apart or breaking off.
- As a result of this, when building a bridge, engineers want the bridge cables to have great tensile strength so that they do not collapse <em>under the weight</em> placed on them.
- A bridge is a passage or structure that <em>connects between two obstacles.</em> A lot of cars, heavy lorries and trucks pass through a bridge, so iit is important that the bridge cables are able to resist this stress effectively.
'
- Therefore, the correct answer is tensile strength
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The freezing point depression is a colligative property which means that it is proportional to the number of particles dissolved.
The number of particles dissolved depends on the dissociation constant of the solutes, when theyt are ionic substances.
If you have equal concentrations of two solutions on of which is of a ionic compound and the other not, then the ionic soluton will contain more particles (ions) and so its freezing point will decrease more (will be lower at end).
In this way you can compare the freezing points of solutions of KCl, Ch3OH, Ba(OH)2, and CH3COOH, which have the same concentration.
As I explained the solution that produces more ions will exhibit the greates depression of the freezing point, leading to the lowest freezing point.
In this case, Ba(OH)2 will produce 3 iones, while KCl will produce 2, CH3OH will not dissociate into ions, and CH3COOH will have a low dissociation constant.
Answer: Then, you can predict that Ba(OH)2 solution has the lowest freezing point.