How do you do problem #15?
How do you do problem #15? - 1

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Answer 1
Answer: you would convert the cg to g. 1.66 cg is 0.0166 g. then you add. 0.398 + 0.0166 = 0.4146. the answer is 0.4146 grams.

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Heterogeneous materials are always mixtures. Are homogeneous materials always pure substances? Explain.

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A homogeneous material is not always a pure substance.
For example, a solution is a homogeneous mixture, but it is not a pure substance. Salty water is homogeneous, but it is not a pure substance. There are two ingredients: salt, and water. 

Is four grams of H2O more than, less than, or equal to one mole?

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it is equal because they both weight the same

A 500 gram piece of metal has a volume of 2.75cm3 what is the density

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Answer: 181.82\ g/cm^3

Explanation:

Given that the volume of a piece of metal = 2.75\ cm^3

Mass of piece of metal= 500 g

Formula to calculate the density is given by :-

\text{Density}=\frac{\text{Mass}}{\text{Volume}}

Then, the density of piece of metal is given by :-

\text{Density of piece of metal}=(500)/(2.75)\n\n\Rightarrow\ \text{Density}=181.818181818\approx181.82\ g/cm^3  [Rounded to the nearest two decimal places.]

Hence, its density of piece of metal= 181.82\ g/cm^3

density is mass / volume so it is 500 / 2.75=181.82 g/cm3

What is one of the by products of using a cooling system?

Answers

Answer:

air conditioning

Explanation:

What parts are different between plant and animal cells? How does this affect what the cells can do? Please help me ASAP!!!!

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Plant cells have a cell wall, so it can't pinch in and separate like an animal cell does. So, a plant cell forms a cell plate in the middle, then that becomes a cell wall and new membrane. That's why plant cells are so close together.

The cells of most plants do not have centrioles, although a spindle of fibers is present. Cytokinesis usually, but not always occurs during telophase. The rigid cell wall prevents the formation of cleavage furrow during cytokinesis; instead, a cell plate forms to separate the parent cell into two daughter cells, and a new cell wall forms along the cell plate.

Now see plant cells have a cell wall as animal cells do not. A plant cell also has a cytoplasm. A plant also has a vacuole. And parts of a cell are in different  places then each other. I hope this helped!

discuss the relationship between the size and weight of an object and the amount of friction that is present

Answers

As both size and weight of an object increase, so will the amount of friction. The bigger size an object is, the more surface area it will have, and the heavier an object is, the more pressure it will place on something else. Both these factors lead to increased friction.