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Explain how finding 4 times 384 can help you find 4 times...
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14. Answer;
-There are two potassium ions for each ion of sulfur.
Explanation;
The formula K2S indicates that there are two potassium ions for each ion of sulfur.
-K2S is the formula of potassium sulfide.
- From the formula; two potassium atoms combines with 1 atom of sulfur to form the compound. In other words the ratio of potassium and sulfur atoms in the compound is 2 : 1.
15. Answer;
-Lithium fluoride
Explanation;
-Fluorine, F, forms a binary ionic compound with lithium, Li. The name of the compound is lithium fluoride.
- A compound is a substance that is formed when two or more atoms from different elements are chemically bonded. For example Lithium fluoride is a compound that is made of fluorine atom and lithium atom that are chemically combined.
16. Answer;
-Carbon-12 atom
Explanation;
The standard on which the atomic mass unit is based is the mass of a carbon-12 atom.
-Atomic mass is the quantity of matter contained in an atom of an element. -The atomic mass is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, which is assigned an atomic mass of 12 units.
17. Answer;
- Non-metal fluorine
Explanation;
-Two highly reactive elements in Period 2 are the metal lithium and the non-metal fluorine.
-Elements in period 2 often have the most extreme properties in their respective groups. Fluorine is the most reactive halogen, neon is the most inert noble gas, and lithium is the least reactive alkali metal, but the most reactive metal in group 2.
Answer:
Explanation:
a)
d = separation of the slits = 0.30 mm = 0.30 x 10⁻³ m
λ = wavelength of the light = 496 nm = 496 x 10⁻⁹ m
n = order of the bright fringe
D = screen distance = 130 cm = 1.30 m
= Position of nth bright fringe
Position of nth bright fringe is given as
For n = 1
For n = 2
For n = 3
b)
Position of nth dark fringe is given as
For n = 1
For n = 2
For n = 3
Answer:
Also 0
Explanation:
Since average speed of an object is that object's displacement over a unit of time, when an average speed is 0, its displacement over a unit of time must also be 0. When an average speed is not 0, then its displacement over a unit of time is also not 0 for that interval.