In polar coordinates, the origin is called the _____.
Answers
Answer:
In polar coordinates, the origin is called the pole.
Explanation:
The position of a point in a polar coordinate system is defined by using the distance from a fixed point and an angle made with a fixed ray from that point. It is a two-dimensional coordinate system.
The polar coordinates is defined as
Where, r is radius and θ is the angle with the polar axis, i.e. positive axis.
In a coordinate system (0,0) is called origin.
In polar coordinate system (0,0) is called pole.
Therefore, in polar coordinates, the origin is called the pole.
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Answer:
The correct formula for boron tribromide is BBr3 (option b).
In this compound, boron (B) has a valency of 3, and bromine (Br) has a valency of 1. The subscript 3 indicates that there are three bromine atoms bonded to one boron atom.
To determine the correct formula, it's important to understand the valencies of the elements involved. Boron typically has a valency of 3, which means it can form three bonds with other elements. Bromine, on the other hand, has a valency of 1, indicating that it can form one bond.
In boron tribromide, the three bromine atoms each form a single bond with the boron atom. So, the formula is BBr3, indicating one boron atom and three bromine atoms.
It's important to pay attention to the subscripts in a chemical formula, as they indicate the number of atoms present in the compound. In this case, the subscript 3 indicates that there are three bromine atoms bonded to one boron atom. If the formula were written as B3Br or 3BBr, it would imply that there are three boron atoms, which is incorrect.
Remember, when writing chemical formulas, it's crucial to consider the valencies and the number of atoms involved to accurately represent the compound.
Answer: b. BBr3
Explanation:
When we see prefixes such as mono-, di-, and tri-, that indicates the number of atoms of that element. So, tribromide means that there are 3 atoms of bromide. Boron has no prefix, so there is only 1 atom of boron.
So, our final formula is BBr₃.
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Answer is: A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.
Pure substance is made of only one type of atom (element) or only one type of molecule, it has definite and constant composition with distinct chemical properties. Pure substances can be separated chemically, not physically, that is difference between pure substances and mixtures.
Electrolysis of water (pure substance) is the chemical separation, because from one molecule (water) two molecules (hydrogen and oxygen) are produced. Water is separeted into two molecules:
Reaction of reduction at cathode: 2H⁺(aq) + 2e⁻ → H₂(g).
Reaction of oxidation at anode: 2H₂O(l) → O₂(g) + 4H⁺(aq) + 4e⁻.
Answer:
- ANSWER:B
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Answer:
Corona
Explanation:
The outermost layer of the sun's atmosphere is called the corona, meaning “crown.” The corona is formed of thin wisps of gas that extend outward into space for millions of miles. It is much less bright than the photosphere, so we can only see it if the rest of the sun is blotted out, for example during a solar eclipse.
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Answer: Red Plate Dinner
Explanation:
If we calculate them with formula for area of circle().
Red Plate - = 36
2 Yellow Plate - 2 * = 2 * 9
= 18
The Red Plate has a bigger area, so the Red plate has more area.
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