Correct answer is magnesium bromide. This is an ionic compound with metal forming a positive ion - K+ and halogen forming a negative ion - Br-. When group 7 element form ions they have a suffix -ide. Bromine is the element and when it forms a negative ion bromine is called bromide with the suffix.
Magnesium gives 2 electrons and bromine can take only 1 electron, therefore 2 bromine atoms are needed. Therefore magnesium forms ionic bonds with 2 bromine atoms.
The compound is called magnesium bromide
Answer:
The answer to your question is 27 g of Al
Explanation:
Data
mass of Al = ?
moles of Al₂O₃ = 0.5
The correct formula for the product is Al₂O₃
Balanced chemical reaction
4Al + 3O₂ ⇒ 2Al₂O₃
Process
1.- Calculate the molar mass of the product
Al₂O₃ = (27 x 2) + (16 x 3)
= 54 + 48
= 102 g
2.- Convert the moles of Al₂O₃ to grams
102 g ---------------- 1 mol
x ---------------- 0.5 moles
x = (0.5 x 102) / 1
x = 51 g of Al₂O₃
3.- Use proportions to calculate the mass of Al
4(27) g of Al --------------- 2(102) g of Al₂O₃
x --------------- 51 g
x = (51 x 4(27)) / 2(102)
x = 5508 / 204
x = 27 g of Al
Explanation:
MWQ means the minimum weighable quantity.
Mathematically, MWQ = ![\frac{Sensitivity}{1 - \text{fraction of accuracy}}](https://tex.z-dn.net/?f=%5Cfrac%7BSensitivity%7D%7B1%20-%20%5Ctext%7Bfraction%20of%20accuracy%7D%7D)
or, MWQ = ![\frac{sensitivity}{\text{fractional error}}](https://tex.z-dn.net/?f=%5Cfrac%7Bsensitivity%7D%7B%5Ctext%7Bfractional%20error%7D%7D)
It is given that sensitivity is 4.5 mg and maximum permitted error is 3.6%.
Therefore, fraction error =
= 0.036
Hence, we will calculate MWQ as follows.
MWQ = ![\frac{sensitivity}{\text{fractional error}}](https://tex.z-dn.net/?f=%5Cfrac%7Bsensitivity%7D%7B%5Ctext%7Bfractional%20error%7D%7D)
= ![\frac{4.5 mg}{0.036}](https://tex.z-dn.net/?f=%5Cfrac%7B4.5%20mg%7D%7B0.036%7D)
= 125 mg
Thus, we can conclude that the MWQ of the given balance is 125 mg.
Answer:
The speed of light becomes slower in denser medium which is water in this case.
Explanation:
We know the lens law of Refraction which states
Refractive index of second medium /Refractive index of the first medium
= Velocity of light in medium 1 (V1)/ velocity of light in medium 2 (V2)
When light rays fall from air medium into water which is a denser medium bending of light or change in the direction of light occurs which is knows as Refraction.
When refraction occurs speed of the light rays are also varied as we can see it from the Lenz's Law. suppose two light rays parallel to each other falling on the air-water interface at an angle , the first ray will reach the interface and bend about the normal and then the second ray. We also observe when light enters denser medium the speed of light becomes slower, also the bending of light when going from rarer to denser it bends towards normal of the surface and when it move from denser to rarer medium it moves away from the normal to the surface.