PHYSICS MIDDLE SCHOOL

PLEASE HELPWhich of the following is an example of a physical property?

Flammability
Reaction with bases
Solubility
Reaction with oxygen

Answers

Answer 1
Answer:

Answer:

The correct answer is C) Solubility

Explanation:
Answer 2
Answer:

Final answer:

Solubility is the example of a physical property from the given options, as it can be observed and measured without changing the substance's chemical identity.

Explanation:

The question is asking which of the listed options is an example of a physical property. A physical property is a characteristic of matter that can be observed or measured without changing the substance's chemical identity. Among the choices given - flammability, reaction with bases, solubility, and reaction with oxygen - solubility is a physical property. This is because solubility refers to a substance's ability to dissolve in a solvent, which can be observed without causing a chemical reaction. On the other hand, flammability and reaction with bases or oxygen are chemical properties, as they describe a substance's ability to react and form new substances.

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Draw a vector for a force of 69 N @ 76 degrees

Answers

Answer:

The force is shown in the figure below which is 69 N at 76° from the positive x-axis

there are two component  Fx and Fy which are in the direction of x-axis and y-axis.

76=\sqrt{Fx^(2) +Fy^(2) }

What type of energy is formed when an object encounters friction?​

Answers

Answer:

thermal energy

Friction does negative work and removes some of the energy the person expends and converts it to thermal energy. The net work equals the sum of the work done by each individual force. The forces acting on the package are gravity, the normal force, the force of friction, and the applied force.

Explanation:

Answer:

Explanation:

Thermal energy due to heat coming in from rubbing like rubbing your hand and it feel warm

What things affect gravity

Answers

The force of gravity = GMm / r^2, where G is gravitational constant, M is mass of one object, m is mass of another object, r is distance between them.

So, mass of objects affect gravity as well as the distance between the two objects.
Distance and mass affect gravity. If an object has a greater mass, it's gravitational pull will be stronger. And if an object is further away from the one that is exhorting the gravitational pull, then the gravitational pull on the object will be weaker than on closer objects.

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 \rm HCl.

\rm HCl and water \rm H_2O contain about the same number of electrons. The H-Cl bond in \rm HCl 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 \rm HCl molecules. Without hydrogen bonding, \rm HCl boils at well below \rm 0\; ^\circ C 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 \rm H_2O) is typically greater than that of water (liquid \rm H_2O.) 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.

List the objects found in the universe in order of size

Answers

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Can someone please answer these two science questions. Please don't answer with just anything for the points, I genuinely need the answers. Thanks! :)

Answers

6.

Answer:

45 meters

Explanation:

notice that is you multiply the time with the speed the units cancel to get distance.

therefore

distance=velocity(time)

distance=(3)15

distance =45 meters

7.

Answer:

1. the speed is constant

2. the average speed is .5 m/s

Explanation:

I have attached a graph of the data in excel.

from excel i got the equation of the line to be y=.5x with y being distance and x being time.

the function is a position function so if you take the derivative of it you get the velocity which is .5.

since the derivative is a constant the the speed does not change and the average velocity is the derivative.
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