Select all that apply.
A
Water would be a gas at room temperature,
B
Water would boil at 100 degrees Celsius.
C
Water would form droplets.
D
ice would sink.
Answer:
A. Water would be a gas at room temperature, and
D. Ice would sink in water.
Explanation:
There are three types of intermolecular forces: London dispersion forces, dipole-dipole interactions, and hydrogen bonds. The relative strength of these forces depend on the size of the molecule. However, for small molecules like water (three atoms per molecule,) hydrogen bonds would be much stronger than the other two types of forces.
Without hydrogen bonds, water molecules would be held together only with dipole-dipole interactions and London dispersion forces. To get an idea of what that would be like, consider hydrochloric acid .
and water contain about the same number of electrons. The H-Cl bond in is polar, which allows for dipole-dipole interactions. However, only H-O, H-F, and H-N bonds allow for hydrogen bonding. As a result, there won't be any hydrogen bonding between molecules. Without hydrogen bonding, boils at well below under standard pressure. It is a gas at room temperature under standard pressure. That's about the same as what water molecules would behave (physically) without any hydrogen bonds between them.
Also because of hydrogen bonding, the density of ice (solid ) is typically greater than that of water (liquid .) When compared to water in its liquid state, there are more hydrogen bondings between molecules of water in its solid state. The hydrogen bonds hold the molecules together to form a lattice. Because of this structure due to hydrogen bondings, the molecules are farther apart than they are in the liquid states. As a result, the density of ice is typically smaller than that of water. That would likely not be the case if there was no hydrogen bondings between water molecules.
Answer:
compressional wave
Explanation:
longitudinal ! :) :)
The number of protons always equals the number of neutrons in all isotopes.
B.
The number of protons never equals the number of neutrons in an isotope.
C.
Different isotopes for the same element will always have the same numbers of neutrons.
D.
Different isotopes for the same element always have the same number of protons.
Answer:
D. different isotopes for the same element will always have the same numbers of neutrons.
Explanation:
An isotope is the different variant of an element that has different number of neutron. There are various elements found in nature that have different isotopes.
Number of neutrons present in atom is different for the same element which makes the mass of one isotope different from the another.
Example of such isotope : Isotope of hydrogen are Protium, Deuterium and Tritium.
Different isotopes for the same element will always have the same numbers of neutrons.
The correct statement about isotopes is C. Different isotopes for the same element will always have the same numbers of neutrons. Isotopes are variants of an element that have the same number of protons but different numbers of neutrons. The number of protons in an element determines its atomic number, whereas the sum of protons and neutrons determines its atomic mass. So, while isotopes of the same element have the same number of protons, they can have different numbers of neutrons.
#SPJ6
Answer:
Urbanization, oil spill, leaky landfill and deforestation are causes of pollution while desertification, smog, contaminated water are the effects of pollution.
Explanation:
Urbanization is generally associated with an increase in the number of industries. The waste materials in different forms from the factories pollute air, water and soil.
The effluents from factories released into rivers cause water pollution and harm the aquatic life. Water contaminated by industrial waste becomes unsuitable for drinking. Forests play a major role in controlling the amount of carbon dioxide in the atmosphere.
Deforestation increases the amount of carbon dioxide in the atmosphere. Oil spills usually occur in oceans and seas and it causes water pollution and threatens aquatic life.
Answer:
Cause
industrial wastes dumped into rivers
oil spilled on land mixes with runoff
sewage dumped into rivers
Effect
destroyed natural habitats
fish die-off
spread of disease
Explanation:
plato