CHEMISTRY MIDDLE SCHOOL

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 300J of energy to the room?Answer:______ unit:_

Answers

Answer 1

Answer:

Answer:

300 J.

Explanation:

The first law of thermodynamics is the law that demonstrates the conservation of energy.

It states that the total energy of an isolated system can not be created or destroyed, but it may be transformed into another form.

The energy released to the room is 300 J.

So, according to the law of conversation of energy; the amount of heat removed from food inside of the refrigerator is 300 J.

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Please help! Which halogen has the strongest IMF and why?

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Answer:

The larger the species, the further away from the nucleus the outer electrons are and hence the less strongly they are held. This means the bigger atoms will be more polarizable. So, the order from biggest-smallest molecules (strongest to weakest IMF) is iodine, bromine and finally chlorine.

Explanation:

What scientists do that is the basis for their investigations

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The basis of any scientific investigation is a hypothesis and a research question. These guide your research and help you focus on an area that is narrow enough to study for meaningful results. The research question helps quantify how you are going to study the hypothesis.

Select all of the characteristics that define matter. A.) Matter has mass. B.)Matter has volume (takes up space). C.)Atoms and compounds are made out of matter. D.) All matter has the same density.

Answers

Explanation:

Matter is defined as the substance that has mass and occupies space.

This means every matter will have mass and every matter will also have volume as it occupies space.

Every matter is made up of number of atoms as these atoms are the small sub-units that combine together and constitute a matter.

Hence, the statement atoms and compounds are made out of matter is not true.

As density is mass present in per unit volume. Therefore, every matter will vary in density.

Thus, we can conclude that characteristics that define matter are as follows.

Matter has mass.

Matter has volume (takes up space).

Answer:

The answer to your question is: a, b and c

Explanation:

A.) Matter has mass. this option is correct, matter is formed by mass.

B.)Matter has volume (takes up space). this option is correct, matter takes up space.

C.)Atoms and compounds are made out of matter. This option is correct, all atomsand compounds are made out of matter.

D.) All matter has the same density. This optio is wrong, matter of different elements or compounds have different density.

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 does the frogs vestigial thumb help survival?

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to help create food establishment.

The body is a system of interacting subsystems composed of a group of specialized cells and tissues because....Can someone help fill in the rest? Thanks

Answers

In multicellular organisms, the body is a system of multiple interacting subsystems. These subsystems are groups of cells that work together to form tissues and organs that are specialized for particular body functions.

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Final answer:

The human body is a system of interacting subsystems composed of specialized cells and tissues, each performing a specific function. These subsystems, such as the circulatory and digestive systems, cooperate to maintain overall health and homeostasis.

Explanation:

The body is a system of interacting subsystems composed of a group of specialized cells and tissues. This is because each subsystem or organ system consists of particular types of cells and tissues that carry out specific functions. For instance, the circulatory system, made up of the heart, blood vessels, and blood cells, transports nutrients and oxygen throughout the body. The digestive system, including the stomach, small and large intestines, and other components, breaks down food and absorbs nutrients. These subsystems interact with each other to maintain the body's overall homeostasis and good health.