Chemistry Quizzes Online & Trivia

In conservation of environment lesson bio plastic 3 option is the green chemistry product

To solve this problem remember one thing: the volume will remain constant because the gas is placed in a steel tank. The formula you need to follow is: P1/T1 = P2/T2. Input all of the needed details and you will reach the answer 84.59 Degrees Celsius which is letter C in the choices. The gas pressure will increase because of kinetic energy. When the molecules are required to move, they would try their best to move around to supposedly get out of the container. Since they are confined to the container however, they would keep on bumping around. As they continue moving, the pressure will start to increase. There are moments when they bump around so much that the enclosed container succumbs to the pressure and blows up.

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Electrons, protons, and neutrons are the three fundamental particles in an atom. Electron is a negatively charged particle, and according to Dalton's Atomic Theory, electrons are found outside the nucleus, and they orbit the nucleus. Protons, on the other hand, are positively charged particles found inside the nucleus of an atom together with neutrons. Protons consist of other simpler particles, while electrons do not consist of other simpler particles. Since both protons and neutrons have opposite charges, electrons will always revolve around the nucleus in a bid to get attracted to a proton. And since the number of electrons in an atom is equal to the number of protons, therefore, we have a neutral atom. Electron is usually represented with the symbol e-, while a proton is represented with the symbol p+. The relative mass of an electron is 0.00055, whereas the relative mass of a proton is 1. The atomic number of an atom can be calculated by knowing the number of particles or protons in a molecule.

H-F is the most ionic out of all the choices available. This is because when the differences are computed, this has the greatest electronegativity difference. Take note that only those with differences that are 1.7 and higher are considered to be ionic. A perfect ionic bond needs to have 100% ionic bond character. A covalent bond is the opposite of an ionic bond. Covalent bonds usually involve the sharing of different electron pairs. Usually, it is the electrons that are shared/arranged between the different atoms.

NF3 has a trigonal pyramidal structure. Nitrogen has three bonds with fluorine and the presence of one lone pair. There is a good amount of polarity due to the electronegativity differences in both atoms. Nitrogen develops a semi-positive charge and the fluorine ions develop semi-negative charges. The lone pair is responsible for the pyramidal structure without whose presence would be trigonal planar.

The sum of the coefficients is basically the total number of reacting molecules and products formed. However, you need to balance the equation first in order to reach the right value. For that, balance the aluminum with the oxygen and the product side. This will give use 4 aluminum atoms reacting with 3 oxygen molecules to form 2 molecules of AL2O3. We can easily find the sum by adding all the molecules. 4+3+2=9. The sum of coefficients for this equation is 9. You can find the coefficient for other equations using this method as well. Simply balance the equation and then add the molecules on each side of the equation.

The correct answer is answering E: the atoms have the same atomic number, but a different number of neutrons. This is key. The atomic number signifies how many protons an atom has. If it has three protons, the atomic number is three. When the electrons are greater or less than the protons, the atom has an electrical charge. If the protons and electrons are equal, then the atom has no charge. Neutrons are special because they are not electrically charged. The only difference to anything that they can make is a difference in how heavy something is. So, one atom of uranium can have a certain amount of neurons and be radioactive, while another atom may have fewer and be completely stable.

Given: Sea water contains roughly 28.0 g of NaCl per liter. To find: What is the molarity of sodium chloride (NaCl) in sea water? Solution: Molecular mass of NaCl= 58.4 Therefore 1 mole of NaCl= 58.4 g Number of moles in sea water= 28/58.4= 0.479 Therefore, 1 litre of water contains 0.479 moles of NaCl Now, Molarity(M) = Number of moles of solute/ volume of solvent. Therefore, M= 0.479/1 = 0.479M  

Option B - increase in pressure. The extent of adsorption is directly proportional to the pressure. Therefore, increase in pressure will cause increase in rate of adsorption. Keep in mind that temperature also has a role to play in the rate of adsorption. At low temperature, the extent of adsorption increases rapidly with pressure.

The volume occupied by the Ammonia gas is C. 67.2 Liters. Ammonia is a compound that is composed of both nitrogen and hydrogen. Ammonia is normally used in order to rouse people into consciousness when they faint. Take note that Ammonia gas can be dangerous when it is inhaled in large amounts. It can also be problematic when it is consumed in liquid form. This sometimes comes in liquid form too but it should not be mixed with certain compounds in any way. For example, when this becomes exposed to bleach, expect that a type of poisonous gas can be formed and this will be deadly for a lot of people. This should be handled carefully at all times.

DecreasesIncrease in nuclear charge shrinks the atoms as we move from left to reigt