The total positive charge on a copper penny is <u>1.36×10⁵C.</u>
One gram molecular weight of an element contains Avogadro number of independent entities. The atomic weight of Copper is 63.546.
Therefore 63.546 g of Copper contains 6.023×10²³atoms of copper.Calculate the number of atoms N in 3.1 g of copper in the penny.
The atomic number Z of copper is 29. Atomic number is equal to the number of protons present in the nucleus of the atom. Thus, a copper atom has 29 protons. Each proton has a charge e equal to 1.6×10⁻¹⁹C.
Therefore the total charge Q on the penny is given by,
Substitute 2.938×10²²for N, 29 for Z and 1.6×10⁻¹⁹C for e.
The total positive charge on a copper penny is <u>1.36×10⁵C.</u>
Answer: Option (c) is the correct answer.
Explanation:
Physical properties are the properties in which there is no change in chemical composition of a substance. On the other hand, chemical properties are the properties which change the chemical composition of a substance.
For example, when water boils at then it changes into vapor state whereas when water freezes at then it changes state from liquid to solid.
This means only physical state of water is changing and there is no change in chemical composition of water.
Hence, we can conclude that best option describing given information is that these are the physical changes water undergoes.
Answer:
a) Earth
Explanation:
When constructing an accurate scale model of the solar system on a football field with the Sun at one end and Neptune at the other, the planet closest to the center of the field would be Earth.
From the given options the earth is the closest planet to the center of the field. The center of the field can be considered as the sun. In reality we have mercury as the closest planet in our solar system.
Pure water. Lemon juice is acidic so it’s not neutral PH it has lower pH Hand soap is basic which makes it have more PH. baking soda is also a basic so it makes it higher ph.
Answer:
y < 272
Explanation:
first turn 1/8 into a decimal which is 0.125 then devide 34 by 0.125 which is 272, meaning y is less than 272