CHEMISTRY HIGH SCHOOL

Which object would best be identified by a periodic Doppler shift in a star's spectrum along with a dip in the stars light intensity?a black hole
a nebula
a comment
a planet

Answers

Answer 1
Answer: The answer would be a planet. Planets revolve around stars, which means there will come a point where the planet is between the star and our field of vision towards the star. This point will be where the star's radiation will have the lowest intensity. As the planet moves, the intensity will change. The effect is comparable to a lunar or solar eclipse.
Answer 2
Answer:

Answer:

D.  a planet

Explanation:

I just took the test!!!

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Convert 8.5 x 10-3 mm to micrometers

Answers

Explanation:

1mm = 10^-3 micrometre

8.5 x 10^-3 mm = 8.5 x 10^-6 micrometre

1.Cheraw is a folk dance native to Mizoram. True or False?2.Neon is used in electric signs and fluorescent lamps .true or false?​

Answers

Answer:

true

true

Explanation:

pki points nmn po

Which two organic compounds share a functional group?

Answers

Both Octane and Propane have the same functional group (Alkanes)
Both Ethene and Propene have the same functional group (Alkenes)
Both Ethyne and Butyne have the same functional group (Alkynes)
Both Ethanol and Propanol have the same functional group (Alcohol)
Both Ethanoic Acid and Propanoic Acid have the same functional group                    (carboxylic acid)

The gray balls represent _____ and have a neutral charge. protons neutrons electrons

Answers

Protons have a positive charge.Electrons have a negative charge.Neutrons have no (neutral) charge.

Answer: The correct answer is neutrons.

Explanation:

There are 3 subatomic particles that are present in an atom. They are: protons, electrons and neutrons.

Protons carry positive charge and are found inside the nucleus of an atom.

Electrons carry negative charge and are found around the nucleus in the orbits.

Neutrons does not carry any charge and are found inside the nucleus of an atom.

Hence, the correct answer is neutrons.

What's the electron configuration of Zr (AN 40)​

Answers

The electron configuration of Zr (AN 40) is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d2 5s2

What proof did you see in the experiment that a chemical reaction took place?

Answers

Answer:

Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change
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When a cold drink is taken from a refrigerator, its temperature is 5°C. After 25 minutes in a 20°C room its temperature has increased to 10°C. (Round your answers to two decimal places.) (a) What is the temperature of the drink after 40 minutes? 12.51 Incorrect: Your answer is incorrect. °C (b) When will its temperature be 12°C?
An atom of the element zinc has an atomic number of 30 and a mass number of 65. How many protons does an uncharged zinc atom have?30356595
What do scientists usually do if they can't draw clear conclusions?