both questions pls !!

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

[tex]Density = \frac{mass}{volume} [/tex]

From the question

mass of aluminum = 40.5 g

volume = 15 mL

Substitute the values into the above formula and solve for the density

We have

[tex]Density = \frac{40.5}{15} [/tex]

We have the final answer as

Hope this helps you

Answer:

Explanation:

Knowing what things are made of, especially in the case of a mixture whose constituents still retain there chemical properties, assists in knowing the beneficial and harmful effects of those things.

For a example, a body cream/lotion (a mixture) that contains hydroquinone will give an individual the idea that the body cream is a lightening cream; as hydroquinone is a depigmenting agent that reduces the production of melanin thereby leading to the lightening of the skin.

Another relevant example is the hand sanitizer that is recommended for use of cleaning of hands in order to rid the hands off of corona virus. The recommended hand sanitizer should be made of at least 60% ethanol for effective use (which dissolves the virus). Knowing the components of a sanitizer to be used against the virus will assist an individual at a store make informed decision about purchase.

Answer:

65.8 miles

Explanation:

Answer:

b.plasma

Explanation:

they jump in a exited energy level and by doing that they give off light

Answer:

b

Explanation:

its plasma

the one that contains molecule's is  the tope one

Really hope this helped :)

Answer:

the answer I sthe first one .

Answer:

C

Explanation:

Answer:minerals

Explanation:

Chemicals are the smallest level of organization that makes the cell. The nucleic acids, water, and carbohydrates are crucial for life, but minerals are not chemicals of life. Thus, option A is correct.

Biochemicals are substances that are essential for living things and are also produced inside the cells. Major biochemicals are carbohydrates, nucleic acids, lipids, and proteins. They are made up of various chemicals and elements.

These are the most essential chemicals that are crucial for survival and play an important role in various activities and functions. Minerals are not chemicals involved in life. The various chemicals perform various metabolic and cellular functions.

Thus, option A. minerals are not chemicals of life.

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Answer:

V = 1.84 × 10³ L

Explanation:

You need to use the Ideal Gas Law and solve for volume.

PV = nRT

V = nRT/P

First, you need to convert the pressure to atm.

1 atm = 760 mm Hg

948/760 = 1.247 atm

Next, convert grams of xenon to moles.  The molar mass is 131.293 g/mol.

128/131.293 = 0.975 mol

You now have all of the values needed.

P = 1.247 atm

n = 0.975 mol

R = 8.314 J/mol*K

T = 283 K

Plug the values in and solve.

V = nRT/P

V = (0.975 × 8.314 × 283)/1.247

V = 1.84 × 10³ L

The volume of the sample will be 1.84 × 10³ L.

Answer:

d

Explanation:

The feature of a hypothesis leads to a new experiment is an ability to be tested and the correct option is option 4.

A hypothesis is a proposed explanation or prediction for a phenomenon or observation. It is a tentative statement that can be tested through experimentation or further investigation.

A hypothesis is typically based on prior knowledge, research, and observations, and it serves as a starting point for scientific inquiry. It is a crucial step in the scientific method and provides a framework for designing experiments to gather evidence and support or refute the hypothesis.

A well-formed hypothesis should be clear, specific, and testable, allowing for the collection of data and analysis to draw conclusions about the validity of the proposed explanation.

Thus, the ideal selection is option 4.

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Answer:

if it loses an electron, it becomes positively charged

Explanation:

If electrons are removed from an atom, then it has more positive charges than negative ones, and the atom has an overall positive charge. Positive ions are called cations. The sharing or exchanging of electrons is what forms bonds between atoms.

Answer:

All are correct

Explanation:

Answer:

Nucleus

Explanation:

Answer:

Explanation:

C. matter.

Answer:  The concentration of reducing ends is too small to detect.

Explanation:

The reducing sugar can be defined as the sugar that is capable of acting as a reducing agent because it possesses an aldehyde group and a ketone group. Some polysaccharides are reducing sugars but all the monosaccharides are reducing sugars. The polysaccharide with reducing sugars do not give a positive test for reducing sugars because the concentration or amount of reducing ends is too small to detect.

Answer:

true

Explanation:

Answer:

I think that it is A. x - values

Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 7.2 kg

volume = 9.0 L

Substitute the values into the above formula and solve for the density

That's

We have the final answer as

Hope this helps you

Answer:

D

Explanation:

i think option D

hope this helps

Answer:

D) nocturnal activity

Explanation:

edge 2020

Answer:10

6

=

1000000

or a 1 with 6 zeroes.

Explanation:So

5

⋅

10

6

=

5000000

or five million.

Extensive property is dependent on mass. Intensive property is property that depends only on the type of matter rather than the amount. Hense, Volume is an example of Extensive property and Density is an example of Intensive property.

Hope this helps :)

Answer:

To equal the height of the Gateway Arch in St. Louis, it would take 76810 half dollars.

Explanation:

If the Gateway Arch in St. Louis is 630 feet high, how many half dollars will it take to equal the height if each half dollar is 2.15mm thick?

First, we convert the ft to cm and the cm to mm.

- 1 ft = 30.48 cm

630 ft = 19202.4 cm

- 19202.4 cm = 192024 mm

Now, if a half dollar is 2.15 mm thick, how many half dollars would it take to equal the height of 192024 mm?

1 half dollar = 2.15 mm

X                 = 192024 mm

X = 192024 mm / 2.15 mm

X = 76810 half dollars.

Answer:C

Explanation:

.1 is secure

.01 is secure because shows the lines and can line it up.

.001 you can not tell for sure what the last digit it.

The digit that would have to be estimated in the reading given instrument is the nearest 0.1 g. Therefore, option (c) is correct.

Uncertainty means the range of possible values within which the true or actual value of the lies. The term accuracy is commonly used to mean the difference between the actual or true value and a measured result. Since the actual value of a measurement is not known, the accuracy of a measurement is generally not known either.

Uncertainty is almost always to one significant digit. If the uncertainty starts with a one, then sometimes uncertainty to two significant digits. The experimental measurement always rounds to the same decimal place as the uncertainty.

The uncertainties have two components one is bias related to accuracy and the unavoidable random variation that takes place when doing repeated measurements which are related to precision.

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Answer

A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds

Explanation: