The average density of peat moss comes out to be 0.000013 g/cm3 and that of top soil is 0.002522 g/cm3, making the peat moss 'lighter' in comparison. Seven bags of peat moss are needed to cover a 10ft by 20ft area to a depth of 20 in.
Explanation:First, we need to convert everything into uniform units. In this case, that would be grams and cubic centimeters.
We know that 1 lb = 453.592 g and 1 in.3 = 16.387 cm3, and 1 gal = 3785.41 cm3. Hence,
40 lb = 18143.68 g
and the volume of peat moss = 14 * 20 * 30 in.3 = 84,000 in.3 = 1,376,522.8 cm3
Similarly, volume of topsoil = 1.9 gal = 7192.279 cm3.
So, the average density of peat moss = weight / volume = 18143.68 g / 1,376,522.8 cm3 = 0.000013 g/cm3 and
the average density of topsoil = 18143.68 g / 7192.279 cm3 = 0.002522 g/cm3.
As density is mass per unit volume, the substance with a higher density is 'heavier' for the same volume. Here, the topsoil has a higher density than peat moss; hence it's correct to say that peat moss is 'lighter' than topsoil.
For part B, we need to find out how many bags are needed to cover an area of 10*20 ft.2 to a depth of 20 in. The volume needed = length*width*depth = 10 * 20 * 20/12 ft.3 = 333.33 ft3 = 9445044.416 cm3. Therefore, the number of bags = volume needed / volume of one bag = 9445044.416 cm3 / 1,376,522.8 cm3 = 6.86. As we can't buy a fraction of a bag, we round up to 7 bags.
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Modern atomic theory states that the atom is a diffuse cloud of ________ surrounding a small, dense nucleus.
A) electron
B) neutron
C) proton
D) quark
Answer:
Electron.
Explanation:
According to modern atomic theory, the electron position is not considered to be discrete or fix. We say that there is probability of finding electron in particular area around the nucleus. so this we call as that atom is a diffuse cloud of electrons surrounding a small dense nucleus.
The electron density is maximum in shells.
The modern atomic theory states that the atom is a diffuse cloud of electrons surrounding a small, dense nucleus.
Explanation:The correct answer is (A) electron.
Modern atomic theory states that the atom is a diffuse cloud of electrons surrounding a small, dense nucleus. The electrons are negatively charged particles that orbit the nucleus in specific energy levels or shells. This model of the atom was proposed by Niels Bohr in 1913 and is known as the Bohr model.
For example, in a hydrogen atom, there is one electron orbiting the nucleus. In oxygen, there are eight electrons arranged in two energy levels, with two in the first level and six in the second level.
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How many protons (p) and neutrons (n) are in an atom of magnesium-26?
An atom of magnesium-26 has 12 protons and 14 neutrons. The number of protons is determined by the atomic number of magnesium (12). The number of neutrons is calculated by subtracting the atomic number from the mass number (26 - 12 = 14).
Explanation:For an atom of magnesium-26 (26Mg), you need to understand its atomic structure. The atomic number of magnesium is 12, which states that a magnesium atom always contains 12 protons in its nucleus. This number defines the identity of an element and is always constant.
Magnesium-26 refers to an isotope of magnesium, where 26 represents the mass number. The mass number is the addition of the protons (p) and the neutrons (n) in an atom. In the case of magnesium-26, we already know there are 12 protons. Subtract the atomic number (number of protons) from the mass number to get the number of neutrons. That is, 26 - 12 = 14 neutrons.
So, an atom of magnesium-26 (26Mg) has 12 protons and 14 neutrons.
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