Answer:
1. An ancient study or art which attempted to combine science and philosophy to solve worldly problems Alchemy
2. A homogeneous mixture of elements with metals to form metallic solids Alloy.
3. The simplest unit of an element that still retains the properties of that element compound Atom
4. Two or more elements joined together such that the elements have lost their individual identity Compound
5. A primary substance that cannot be divided into separate substances element Element.
6. The group of elements that are good conductors of electricity and heat Metals
7 . The group of elements that are poor conductors of electricity and heat Non metal
1 lb=453.592 grams
So he gained 453.592 pounds
Answer:
<u>K.E. = 5.4362 × 10⁻¹⁹ J</u>
Explanation:
The expression for Bohr velocity is:
Applying values for hydrogen atom,
Z = 1
Mass of the electron (
) is 9.1093×10⁻³¹ kg
Charge of electron (e) is 1.60217662 × 10⁻¹⁹ C
= 8.854×10⁻¹² C² N⁻¹ m⁻²
h is Plank's constant having value = 6.626×10⁻³⁴ m² kg / s
We get that:
Given, n = 2
So,
Kinetic energy is:
So,
<u>K.E. = 5.4362 × 10⁻¹⁹ J</u>
Answer:
No
Explanation:
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Light moves in a straight line except at surfaces between different transparent materials, where its path bends.
