Please help with my chemistry homework

Answer:

because it's has an additional electron. hydrogen is just made up of one proton

Answer:

Families in chart is offsprings made from molecules

Explanation:

Because babies are made from the offspring on which your eye colors,hair colors and etc.

Answer:

The answer would be 1) extending the sense of sight by using an instrument.

This is because you are using a ruler (your instrument) to see how long the stick is. It can't be 2) calculating the percent of error by using a proportion, because you aren't calculating the percent of error from the stick. It also can't be 3) measuring the rate of change of the stick by making inferences, because you are using a ruler, making it the exact measurement, not making an inference. It can't be 4) predicting the length of the stick by guessing, because again, you're using a ruler to see the exact measurement of the stick.

Answer:

The molar mass of [tex]NI_{3}[/tex] is 394.719 g/mol.

Explanation:

This was on my periodic table.

The density of the wooden block is 7.81 g/cm³

Density is related to mass and volume by the following equation:

With the above formula, we can obtain the density of the wooden block as follow:

Mass of wooden block = 562 g

Volume of wooden block = 72 cm³

Density = mass / volume

Density = 562 / 72

Therefore, the density of the wooden block is 7.81 g/cm³

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Answer:

find the volume of the ice cube then using the formula density=mass over volume calculate the density okay

The density of the object is mass per unit volume. Density is directly proportional to mass and inversely proportional to volume. . The density of the object is 0.916 g/ cm3

Density is defined as mass per unit volume of the object. If the mass of the object increase then the density will increase. If the volume of the object decrease then the density will increase.

Density = Mass / volume

             = 11 g/ 12 cm3

             = 0.916 g/ cm3.

Therefore, The density of the object is mass per unit volume. Density is directly proportional to mass and inversely proportional to volume. The density of the object is mass per unit volume. The density of the object is 0.916 g/ cm3.

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Answer:

H₂O₂ is a covalent compound

Answer:

Is H₂O₂

Explanation:

So That Answer

Answer:

True

Explanation:

The process could repeat it self and the outcome would stay the same.

Answer:

c

Explanation:

it is c because that is the andwer

Answer:

The density remains the same

Explanation:

The density remains the same because cutting the object in half will divide the mass & volume by the same amount. The density cant be changed no matter what happens to it.

Answer:

tritium and deuterium are combined and result in the formation of helium

Answer:

The reason for the suspicion was because the manner in which iodine reacted chemically as well as its other chemical properties, indicated that it belonged in the same group as chlorine and bromine, while the much heavier tellurium should be placed in the previous group

The suspicion was proved to be correct when the atomic number of tellurium was found to be 52 and that of iodine was found to be 53 by later scientists

Explanation:

Answer:

If the property depends on the amount of matter present, it is an extensive property. The mass and volume of a substance are examples of extensive properties; for instance, a gallon of milk has a larger mass and volume than a cup of milk.

Explanation:

Answer:

Baby steps in science occur small bits of__ gradually accumulate

Explanation:

Baby steps in science occur as small bits of evidence gradually accumulate. The evidence lets scientists refine and expand on earlier ideas.

Answer:

Oil?

Explanation:

Answer:

oil

Explanation:

its nonrenewable

Answer:

kk

Explanation:

im here

Answer:

When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.

Answer:

protons and electrons

Explanation:

A P E X

Answer:

All the items in the mixture will not be picked up by the magnet and therefore, all of them would be left behind

Explanation:

Ferromagnetic materials are materials that can become magnetized and are also readily attracted to a magnet or by a magnetic field. Examples of ferromagnetic materials includes, iron, cobalt, and nickel, and their alloys

Ferromagnetic materials are mainly metals while all materials exhibit some form of magnetism including diamagnetism and paramagnetism, but these are not the type of magnetism seen in everyday life

Therefore, since neither of the tomato sauce mixture, the sugar or the carrots are not ferromagnetic materials none of them will be picked up by the magnet.

Answer:

The correct answer is - 75 grams.

Explanation:

Half-life is the amount of time that is used by the given amount of substance or element to make it half of the initial amount of a particular radioactive substance.

Equation for alpha decay for radon

[tex]^222_{86}Rn\Rightarrow^{218}_{84}Po  [/tex]

we need to calculate the left amount of radon after given time

using formula half life

[tex]N(t)=N_{0}e^{-\lambda t}[/tex]

[tex]\lambda =\dfrac{0.693}{3.82}[/tex]

[tex]\lambda=0.1814[/tex]

[tex]N(3.82)=150\times e^{-0.1814\times3.82}[/tex]

[tex]N(3.82)=75.0\ g[/tex]

Thus, the left amount of radon is - 75 grams.

Answer:

Humans use Oxygen or O2 to begin the process of cellular respiration, and then when this process is finished it gives of carbon dioxide or Co2

Explanation:

Answer:

oxygen is used by human in the process of cellular respiration

Explanation:

because cells uses oxygen to break down sugar

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

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

From the question

mass of aluminum = 91.8 g

density = 2.7 g/cm³

It's volume is

[tex]volume = \frac{91.8}{2.7} \\ [/tex]

We have the final answer as

Hope this helps you

Answer: melting, freezing, sublimation, deposition, condensation, and vaporization

Answer:

The answer to that question is 24 AMU.

Explanation:

I know this because i got the answer correct on the quiz. To get the average, you just add the 4 atomic masses given to you together then divide by 4.

Replacement  I think, hope this helps ;)

Explanation:

Answer:

Replacement

Explanation:

Explanation:

electronic confirmation=1s^2,2S^2,2P^6,3S^2

atomic no.is 12 therefore :- this is magnesium

Period=3

Block=s-block

Group=II A

A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons, and the process repeats. The process may be controlled (nuclear power) or uncontrolled (nuclear weapons).

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