Without water's hydrogen bonds, whichof the following would occur?
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.
Answers
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.
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What is the force of gravity on the rocket at the planet's surface?
What is the force of gravity on the rocket at a distance of two units (twice the planet's radius from its center)?
In general, how does the force of gravity pulling on the rocket change as the distance between it and the planet increases?
Answers
-- The relationship between the distance from the planet's center and the force of gravity on the ship has been graphed. That's the reason for the labels on the axes.
-- The distance from the planet's center is labeled in multiples of the planet's radius.
The force of gravity on the ship is labeled in multiples of 1 million newtons.
-- The force of gravity on the rocket at the planet's surface (1 radius from the center) is 4 million newtons. (about 899,203 pounds)
-- The force of gravity on the rocket at a distance of two units (twice the planet's radius from its center) is 1 million newtons.
-- In general, as the distance between the rocket and the planet increases, the force of gravity pulling on the rocket decreases.
From our studies of the nature of gravity, we know that the force is inversely proportional to the square of the distance between the center of the rocket and the center of the planet. We might not notice it from the graph, because there's only one labeled point that clearly shows it. (2radius, 1/4 of the surface force).
If we have been really attentive to our studies and have done all of our gravity homework, we know that the equation of the purple line on the graph is
Force = (4 million newtons) / (Distance)² for Distance >= 1 radius.
How is this different from a distance-time graph?
Answers
Answer:
its devavtion is different from the distance changes process
Explanation:
Final answer:
A speed-time graph and a distance-time graph represent different aspects of motion. A horizontal line on the former indicates a constant speed (zero acceleration), while a straight, upward-diagonal line on the latter shows constant speed. A flat horizontal line on a distance-time graph shows no movement.
Explanation:
A speed-time graph and a distance-time graph each depict different aspects of motion. A horizontal line on a speed-time graph does indeed indicate constant speed or zero acceleration; the object is moving at a constant speed. However, a distance-time graph shows how the position of the object changes over time.
Let's take an example. If a car is traveling at a constant speed, on a speed-time graph, this would be represented by a horizontal line. The height of the line above the time axis represents the constant speed.
On a distance-time graph, a car moving at constant speed will be represented by a straight line with a positive slope. This is because the position of the car is continuously changing (it's covering distance), and at a constant rate. The slope of the distance-time graph gives us the speed of the car.
So, while a flat horizontal line in a speed-time graph indicates constant speed, a flat horizontal line in a distance-time graph would indicate no change in position, i.e., the object is not moving at all.
Learn more about Speed-Time vs Distance-Time Graphs here:
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Answers
After the engines cut off, it couldn't get any more energy from
anywhere, and after that, as it pushed air aside to get through,
and had air molecules scraping against it, those would slowly
rob kinetic energy from it. Sooner or later it would run out of
kinetic energy, start falling, and it would eventually make either
a big 'SPLOOSH' or else a big 'CRUNCH', depending on exactly
where it returned to Earth's surface.
Answers
2.Chemical energy is converted to mechanical energy.
3. Chemical energy is converted to heat energy.
4. Chemical energy is converted to mechanical and kinetic energy.
Answers
the correct answer is 1. Chemical energy is converted to mechanical and heat energy.
When the boy eats apple, the chemical energy of the apple first converted in the heat energy in the process of digestion, which maintains our body temperature, than the body of the boy converts the heat energy into mechanical energy.
Therefore the correct option is 1.
Answer:
Chemical energy is converted to mechanical and heat energy.
Explanation: