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3 years ago

Help!!!!! 30 points!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

1 answer:

ioda3 years ago

8 0

Answer: Hubble's brilliant observation was that the red shift of galaxies was directly proportional to the distance of the galaxy from earth

Explanation:

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After researching the possible effects of music, Elaina proposes that if people listen to faster-paced music, their pulse rates

SCORPION-xisa [38]

Answer:

Elaina's scientific investigation is missing controlled variables.

Explanation:

A good scientific investigation should vary only the factor that is studied (the speed of the music. All other factors should be kept constant.

She hasn’t controlled for volume. The volume of the music may affect the rate at which the listener’s heart rate will increase. She should have measured each person’s pulse after the same period of listening.

She hasn’t controlled for age. A grandmother may respond to loud music differently from a teenager. All her subjects should be about the same age.

She hasn’t controlled for wakefulness. A person may respond to music differently when awake than when asleep.

7 0

4 years ago

Which reaction is an example of an endothermic reaction?

DENIUS [597]

In thermodynamics, the term endothermic process describes a process or reaction in which the system absorbs energy from its surroundings in the form of heat.

3 0

3 years ago

Read 2 more answers

WILL MARK BRAINLEST

Alex73 [517]

To lower the amount of trash my family produces, we can use reusable bottles, cutlery, and dishes. This would be a better alternative to using both paper, and plastic items which would increase trash output. Reusable items like dishes can be used multiple times without throwing them away, instead of having to use plastic items that we’d throw away after using once.

5 0

3 years ago

An s orbital has how many orientations? Group of answer choices

storchak [24]

Answer:

One orientation

Explanation:

A s orbital is a sphere like shape that surrounds the atomic nucleus that consists of electrons that can be found at the highest or lowest region of the orbital. S orbitals only consist of "one orientation" and is commonly mistaken by the p orbital because the p orbital also consists of electrons that can be found the most.

Hope this helps.

7 0

3 years ago

What is a difference between oil and flour?

Anarel [89]

The difference between oil and flour is oil forms a layer at the top of water, and flour settles at the bottom. The correct option is the third option - Oil forms a layer at the top of water, and flour settles at the bottom

Oil is a triglyceride which is insoluble in polar substances but is soluble in nonpolar solvents. That is, oil is insoluble in water.

Oil, when dissolved in water, forms a layer at the top of water. This is because oil is less dense than water.

Flour is insoluble in water. It settles at the bottom of the container.

Now, we will investigate the options one after the other

O Oil is a soluble substance, and flour is an insoluble substance.

Since oil is soluble in nonpolar solvents, this option is NOT correct.

O Flour is a soluble substance, and oil is an insoluble substance.

Since flour is insoluble in water, this option is NOT correct.

O Oil forms a layer at the top of water, and flour settles at the bottom.

Since oil forms a layer at the top of water and flour settles at the bottom of water, then this option is correct.

O Oil forms a layer at the bottom of water, and flour settles at the top.

Oil does not form a layer at the bottom of water and flour does not settle at the top of water. Therefore, this option is NOT correct.

Hence, the difference between oil and flour is oil forms a layer at the top of water, and flour settles at the bottom. The correct option is the third option - Oil forms a layer at the top of water, and flour settles at the bottom

Learn more here: brainly.com/question/20962897

7 0

2 years ago