I really need help please someone help me?!.

Those are all the questions.

Radioactive elements are the elements into which an atom is very unstable or highly reactive because it is having more energy in its nucleus. stable elements are those who have stable and there shell are properly filled with electrons.

Most radioactive chemical elements have one or more radioactive isotopes on the other hand  some chemical elements only have one type of radioactive isotopes.

A radioactive element has an unstable nucleus that emits particles in the form of alpha, beta, or gamma radiation and stable element have stable nucleus with no effect of any radiation or energy due to fully filled orbitals.

Bombarding of these radiations has to be done in the nucleus of the element after this the desired element will become a radioactive element. And there is no effect of these rays on stable elements beacuse they are unreactive to this.

The ray of alpha beta and gamma consists of some charges within them and they are radioactive radiations harmful to human eyes.

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Answer:

almost everything

Explanation:

P1: 741 mmHg

V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L

P2: 760 mmHg

V2: ? L

Answer:

[tex]molar \: mass = (6 \times 12) + (12 \times 1) + 16 \\ = 100 \: g \\ 1 \: mole \: weighs \: 100 \: g \\ 4.00 \: moles \: will \: weigh \: (4 \times 100) \: g \\ = 400 \: g[/tex]

Answer:

i dont know

Explanation:

because i dont know 45

Answer:

true

Explanation:

Answer:

[tex]\boxed {\boxed {\sf False}}[/tex]

Explanation:

We want to know if 50 grams of iron (II) sulfide contains 3.011 * 10²³ molecules.  Let's calculated and check.

We know there are 50 grams of iron (II) sulfide or FeS If we want to convert from grams to moles, we use the molar mass (mass per 1 mole). This is given to us and it is 87.91 grams per mole for this substance. Let's create a ratio.

[tex]\frac {87.91 \ g \ FeS}{ 1 \ mol \ FeS}[/tex]

We want to convert 50 grams of FeS to moles, so we multiply by this value.

[tex]50 \ g \ FeS *\frac {87.91 \ g \ FeS}{ 1 \ mol \ FeS}[/tex]

Flip the ratio so the grams of FeS cancel.

[tex]50 \ g \ FeS *\frac {1 \ mol \ FeS}{ 87.91 \ g \ FeS}[/tex]

[tex]50*\frac {1 \ mol \ FeS}{ 87.91}[/tex]

[tex]\frac {50}{ 87.91} \ mol \ FeS[/tex]

[tex]0.5687635081 \ mol \ FeS[/tex]

1 mole of any substance contains the same number of particles (atoms, molecules, formula units, etc.). This is Avogadro's Number or 6.022 *10²³. In this case, the particles are molecules of FeS. Create another ratio.

[tex]\frac {6.022 *10^{23} \ molecules \ FeS}{ 1 \ mol \ FeS}[/tex]

We want to convert 0.5687635081 moles of FeS to molecules, so we multiply by this value.

[tex]0.5687635081 \ mol \ FeS*\frac {6.022 *10^{23} \ molecules \ FeS}{ 1 \ mol \ FeS}[/tex]

The units of moles of FeS cancel.

[tex]0.5687635081 *\frac {6.022 *10^{23} \ molecules \ FeS}{ 1 }[/tex]

[tex]0.5687635081 *{6.022 *10^{23} \ molecules \ FeS}[/tex]

[tex]3.42509385*10^{23} \ molecules \ FeS[/tex]

If we round to the thousandth place, the 0 in the tenth thousandth place tells us to leave the 5.

[tex]3.425*10^{23} \ molecules \ FeS[/tex]

50 grams of iron (II) sulfide is approximately 3.425 * 10²³ molecules, not 3.011 *10²³ so the statement is false.

Answer:

Large amount of gas can be stored in small container.

Explanation:

They are compressed so that a larger amount of gas can be stored in a smaller container. A greater mass confined to a smaller volume makes transporting and storing of gases easier. Increasing temperature increases pressure, and the cylinders might explode.

Answer:

b is the answer 1000ml

please mark me brainlist

Answer:

Overproduction of Offspring. The first of these factors that must be present in order for Natural Selection to occur is the ability of a population to overproduce offspring.

Variation.

Selection.

Reproduction of Adaptations.

Explanation:

Answer:

Jaclyn knew that Hot temperatures are cooled when out into a colder area.

Answer:

Fluorine azide or triazadienyl fluoride (FN3) is a yellow green gas composed of nitrogen and fluorine with formula FN3. It is counted as an interhalogen compound, as the azide functional group is termed a pseudohalogen. It resembles ClN3, BrN3, and IN3 in this respect.

Explanation:

Answer:

I think it is Fluorine not sure tho

Explanation:

Answer:

108 grams

Explanation:

Answer:

waxing is in the evening and waning is in the morning if you cant see the moon in the evening it is waning if you can see it in the evening it is waxing

Answer:

.

Explanation:

[tex]K_a=\frac{[H_2PO_4^-][H^+]}{[H_3PO_4]}[/tex]

K, the equilibrium constant, is equal to products over reactants raised to their coefficients (excluding solids and liquids and only including aqueous and gasses)

[tex]Ka=\frac{[H_2PO_4^- ][H^+]}{H_3PO_4}[/tex]  is the equilibrium constant and is equal to products over reactants raised to their coefficients (excluding solids and liquids and only including aqueous and gasses). Hence, option A is correct.

A state of balance between opposing forces or actions.

A number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.

[tex]Ka=\frac{[H_2PO_4^- ][H^+]}{H_3PO_4}[/tex]

K, the equilibrium constant, is equal to products over reactants raised to their coefficients (excluding solids and liquids and only including aqueous and gasses)

Hence, option A is correct.

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The condition or progress of a reaction is represented by reaction arrows. The chemical reaction arrow is a single straight arrow that points from the reactant(s) to the product(s) and by-products, as well as side products.

I think this should help you find the answer more easy!

Among these, sodium chloride is a substance which is not a base, therefore option (b) is correct.

A base is a chemical species that donates electrons, accepts protons, or releases hydroxide (OH-) ions in aqueous solution. A base is a molecule or ion able to accept a hydrogen ion from an acid.

A strong base completely dissociates into its ions in water. Bases react vigorously with acids and organic matter. Bases react in predictable ways with pH indicators.

A base substance is  a solution that has a pH level of more than 7.  Bases react with acids to form salts which is called neutralization reaction.

Among these  since sodium chloride is not a base, hence option(b) is correct.

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Answer:

If a species cannot adapt to the changes in their ecosystem, they may move to another location. If they will not move, the species may become threatened, endangered or extinct.

Explanation:

The way the question is worded, it sounds like there are options for you to chose from that you are not showing. I could help you out more if I actually knew the options.

Extinction is likely if conditions change faster than a species can evolve, and if members of that species lack the traits required to survive in the new environment.

The death of all members of a species of plants, animals, or other organisms is referred to as extinction.

The primary cause of higher extinction rates is habitat loss. Other causes include habitat changes, commercial overexploitation of wildlife, the introduction of harmful nonnative species, pollution, and disease spread.

If a species is unable to adapt to changes in its ecosystem, it may relocate. The species may become threatened, endangered, or extinct if they do not move.

Thus, Extinction is likely if environmental conditions change faster than a species can evolve and members of that species lack the traits needed to survive in the new environment.

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Answer:

C. Was Discovered by Mathematical calculations

Explanation:

Terrestrial Planets are Inner Planets (Mercury,Venus,Earth,Mars) and Neptune is an ice giant or gas giant, Neptune is also not the largest planet in the solar system, I believe that's Jupiter. I don't know for sure if Neptune has a horizontal axis but my best guess is C. I hope this helps! :^)

Answer:

the energy barrier that must be surmounted in order for the reactants to transform into products.

Explanation:

When we draw a reaction profile, there is always a hump that is found between the reactants and products. This hump is called the activation energy.

The activation energy of a reaction stands as a sort of barrier between reactants and products which must be surmounted before the reactants are converted into products.

Only reactants that possess the activation energy can be converted from reactants to products.

Answer:

2. 2.41 x 10^22 molec

Explanation:

Answer:

2. 2.41 x 10^22 molec

Explanation:

the other person said that and i got right on my quiz

Answer:

false

Explanation:

Answer:

False

Explanation:

Because if you shoot a arrow and go back and get it and use it again it is potential

Answer: The specific heat capacity of an unknown metal is [tex]0.387 J/g^{o}C[/tex].

Explanation:

Given: Heat energy = 394 J

Mass = 15 g

Initial temperature = [tex]96^{o}C[/tex]

Final temperature = [tex]28^{o}C[/tex]

Formula used is as follows.

[tex]q = m \times C \times (T_{2} - T_{1})[/tex]

where,

q = heat energy

m = mass of substance

C = specific heat capacity

[tex]T_{1}[/tex] = initial temperature

[tex]T_{2}[/tex] = final temperature

Substitute the values into above formula as follows.

[tex]q = m \times C \times (T_{2} - T_{1})\\394 J = 15 g \times C \times (28 - 96)^{o}C\\C = \frac{394 J}{15 g \times (68^{o}C)}\\= \frac{394 J}{1020 g^{o}C}\\= 0.387 J/g^{o}C[/tex]

Thus, we can conclude that the specific heat capacity of an unknown metal is [tex]0.386 J/g^{o}C[/tex].

Answer:

The skin

Explanation:

The skin is the largest organ of the body. The skin and its derivatives (hair, nails, sweat and oil glands) make up the integumentary system. One of the main functions of the skin is protection. It protects the body from external factors such as bacteria, chemicals, and temperature.

Answer:

[tex]d=0.417\ g/cm^3[/tex]

Explanation:

Given that,

Mass, m = 10 g

Volume, V = 24 cm³

We need to find the density of the substance. We know that, the density of a substance is given by :

Density = mass/volume

So,

[tex]d=\dfrac{10\ g}{24\ cm^2}\\\\d=0.417\ g/cm^3[/tex]

So, the density of the substance is [tex]0.417\ g/cm^3[/tex].

Answer:

because the product of CuO contains 2 molecules so it is unbalanced

Explanation:

to balance it 2Cu+2O=4CuO now it is balanced

The direction in which the wind will blow in this situation is from the ocean to the coast and is denoted as option A.

This is defined as the force per unit area of a body and the unit is Pascal. We were told that air pressure above a large body of water is higher than the air above the coast.

This will make the wind blow from the ocean to the coast as the ocean has a higher pressure.

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