CHEMISTRY MIDDLE SCHOOL

Which describes the polarity in a water molecule?

Answers

Answer 1
Answer: Answer:

The oxygen atom in a water molecule is strongly electronegative. The atoms of the water molecule are held together by covalent bonds. water has nonpolar bonds, but it has a bent shape and is therefore polar.

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It is true/falseit that when hydrogen cyanide, h c n , dissolves in water, the solution is weakly conducting and acidic in nature. This is because hydrogen cyanide, h c n is a blank that blank support the movement of charge. In addition, since specifically blank formed, the solution is blank.It is blank that when acetone, CH3COCH3, is dissolved in water conducting solution results. This is because acetone, CH3COCH3 is a blank that blank support the movement of chargeThe words are:True, false, weak electrolyte, strong electrolyte, non-electrolyte, does not, does, H+ is, OH- is, no ions are, acidic, basic, neutral.

Why are some constellations visible year-round, while others appear only part of the year?

Answers

Circumpolar constellations stay in the sky. Because of the rotation of the Earth and its orbit around the Sun, we divide the stars and constellations into two groups. Some stars & constellations never rise nor set, and they are called circumpolar.
circumpolar constellations stay in the sky. Because of the rotation of the Earth and its orbit around the sun, we divide the stars and constellations into 2 groups. Some stars and constellations never rise nor never set, and they are called circumpolar. Thus only some constellations are visible year- round 

How can you cause a physical change?

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You can cause a physical change by bending, ripping, melting (and refreezing), folding, breaking, and there are some others. The main deal with physical changes is that the substance isn't formed into something new, that would be a chemical change. 
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance tochange into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

How is Earth like a magnet

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Earth's magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields. From afar, the Earth looks like a big magnet with a north and south pole like any other magnet.
Earth's magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields. From afar, the Earth looks like a big magnet with a north and south pole like any other magnet.

2 or more components - Substance is two or more diltermore different types of source material.
Chemically combined​

Answers

Answer:

A compound

Explanation:

A compound is a substance made up of two or more components that are chemically combined together.

The substances that combines to form a compound is called elements.

The properties of compounds are distinct and different from the elements that combines to make them.

A wide array of compounds are known and they arise from different arrangements of atoms of elements.

Why do doctors worry more about a fever of a couple of degrees Fahrenheit?

Answers

One degree Celsius is a bigger than one degree Fahrenheit. One degree Celsius equals 1.8 degrees Farenheight.

Hope this helps.
because farenheight goes up higher

Why does tying the arm above the elbow make veins in the forearm more visible?

Answers

The tying results in the more visible veins of upper arms due to blood flow restriction.

Veins are the part of circulatory system in the body, that functions to carry deoxygenated blood from different parts of the body to the heart.

The venipuncture has been the process of insertion of drugs or chemicals in a body through vein. The veins of the upper arm has been tied to make them more visible.

The upper arm veins are more visible as there has been blood flow restriction in the veins by tying that results in the bulging out of the vein.

For more information about veins, refer to the link:

brainly.com/question/9726668
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