If a sample originally had 120 atoms of carbon-14, how many atoms will remain after 17,145 years? Assume the half life of C14 is 5715 years.

Answer:

1. The combined number of protons and neutrons remains constant.

2. There are two atoms with mass numbers of 2.

3. It is the number of protons plus neutrons.

4. A nucleus with a greater mass than any of the reactants will be produced.

5. Fusion reactions in the sun convert small amounts of matter into large amounts of energy.

Explanation: I couldn't see the comments so I guess some ppl can't either but here you go got them all correct! :)

Th sun produces energy through fusion reaction by converting small amount of matter into larger amounts of energy.

The sun is able to produce energy because protons of hydrogen atoms present in the sun collide violently in the sun's core and fuse together leading to the formation helium atom.

This process of fussion is referred to as a PP (proton-proton) chain reaction, and it emits an enormous amount of energy

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Answer:

A

Explanation:

1.0 L * 4 = 4L volume that the gas can occupy at 100 degree Celsius

Answer:

Snow

Explanation:

Precipitation means when water falls from the sky, and snow is frozen water

Answer:

1.457*10^-8 grams

Explanation:

First we want to find the molar concentration of MgF2. We can do this by dividing 0.016 (the solubility in grams of MgCl2 in a litre of water) by its molar mass (approx. 62.3 grams). Thus, the molar solubility of MgF2 is 2.57*10^-4 M.

Next, we must calculate the Ksp of MgF2. The equilibrium expression is:

MgF2⇄Mg+2F

Thus   [tex]Ksp=[Mg^+][F^-]^2[/tex]

This means that, in equilibrium, there are 2.57*10^-4 M of [tex]M^+[/tex] and 5.136*10^-4 M of [tex]F^-[/tex]

Plugging in the above information, our Ksp for MgF2 is approximately 6.78*10^-11

Next we will need to use the RICE table. Since there is already 0.29M of NaF dissolved, there is initially 0.29M of [tex]F^-[/tex].

R: MgF2 ⇄ [tex]Mg^{+}[/tex]+2[tex]F^-[/tex]

I:    N/A        0     0.29M

C:   N/A         +x      +x

--------------------------------------------

E:   N/A         x     0.29+x  

To make calculations easier, we will assume that 0.29+x≈0.29

This means that Ksp=0.29x=6.78*10^-11

Therefore, x≈2.338*10^-10M

Multiply that by 62.3 and we get around 1.457*10^-8 grams.

Notes:-

Electronic configuration

So

Answer:

ik that its not 48 because i answerd 48 and i got it wrong and im pretty sure its also not 144

Explanation:

From the calculations and the data given, the volume of the triangular prism is 24 m3.

The trangular prism is a prismatic figure that has a trianguar base. We know that the formula for the volume of a triangular prism is;

V = 1/2 a c h

Now;

a =  2 m

b =  3 m

h =  8 m

V = 1/2 * 2 m *  3 m * 8 m

= 24 m3

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Explanation:

When 2 moles of sodium hydroxide (NaOH) reacts with 1 mole of phosphoric acid (H3PO4) it gives 1 moles disodium phosphate Na2HPO4 and 2 moles of water.

0.5 molar solution indicates half moles of molecules are present in per ltr solution.

to prepare disodium phosphate you need to dilute phosphoric acid solution to 0.25 molar and add equal quantity of 0.5 molar solution.

[tex]2 NaOH + H_3PO_4  \: \rightarrow \: Na_2HPO_4 + 2 H_2O[/tex]

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Answer:

Strong acids completely dissociate in water to H+ ions and extremely weak conjugate base anions.

Explanation:

its a weak acid

Answer:

because its didn't form H+ ions when react with water

Answer:

6x10^-6 M

Explanation:

The relationship between pOH and [OH-] is

pOH = -log[OH-]

Solving this equation for [OH-] is

[OH-] = 10^-pOH

Plugging in the pOH makes

[OH-] = 10^-5.2

         = 6.31x10^-6

Rounding to 1 sig fig since pOH and pH sig figs are only the number of decimals means to round to 1 sig fig or

6 x 10^-6 M

The statement that is true about aluminum is that it corrodes more slowly than iron does.

Aluminum is a slivery white metal that have atomic number of 13. It is most coon metal and make more than 8% of the Earth's core mass. It's also the third most common chemical element Earth. It is malleable and soft.

It is use for making kitchen utensils, cans and so on.

Aluminum cannot be decomposed by chemical methods.

Therefore, The statement that is true about aluminum is that it corrodes more slowly than iron does.

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Answer:

3.37 × 10²³ atoms

Explanation:

Number of atoms = number of moles ×  6.02 × 10²³

Number of atoms = 0.560 × 6.02 × 10²³

Number of atoms = 3.37 × 10²³ atoms

The balanced equation for the redox reaction between zinc and hydrochloric acid (HCl) that forms zinc(II) ions and hydrogen gas is as follows:

Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)

A redox reaction is a type of chemical reaction in which some of the atoms have their oxidation number changed.

According to this question, the redox reaction between zinc and hydrochloric acid (HCl) forms zinc(II) ions and hydrogen gas. The balanced equation is as follows:

Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)

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Explanation:

The intermolecular forces present in the bonding of CH₃F are dipole-dipole interactions and London dispersion forces.

1.) No, CH₃F does not exhibit hydrogen bonding. Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom such as fluorine, oxygen, or nitrogen. In CH₃F, the hydrogen atom is bonded to carbon, which is not highly electronegative.

2.) Yes, CH₃F exhibits dipole-dipole interactions. Dipole-dipole interactions occur between molecules that have permanent dipoles due to the electronegativity difference between the atoms. In CH₃F, the fluorine atom is more electronegative than the carbon and hydrogen atoms, resulting in a polar molecule with a permanent dipole moment.

3.) Yes, CH₃F exhibits London dispersion forces. London's dispersion forces, also known as Van der Waals forces, are present in all molecules and arise from temporary fluctuations in electron distribution. Although CH₃F has dipole-dipole interactions, it also experiences London dispersion forces due to the temporary shifts in electron density.

Hence, the bonding in CH₃F was explained above.

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Answer:

3 moles of O2 needed

Explanation:

2 moles of Mg   to one mole O2

   so 3 moles of O2 needed

For a cell  operated to produce a constant voltage of 1.50 V, the electrical work done  is mathematically given as

W=2.077*10^{-7}

Generally, the volume of Br2  is mathematically given as

[tex]Vb=\frac{0.38*3.12}{159.809}[/tex]

Vb=7.18*10^-3ml

Therefore, the quantity of charge

q=(1.436*10^-2)*9.644*10^4

q=1.385^{-4}c

In conclusion, work done

W=Eq

W=1.50*1.385^{-4}

W=2.077*10^{-7}

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Answer:

The correct answer to first question is C

I only know this one.

Explanation:

PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE

I also kno wtge answer to question 7 is A

Answer:

alloy is the homogeneous mixture of metal and metal or metal and non metal

Answer:

Yes, an alloy is  combined physically or chemically into a separate compound. And a mixture of

Explanation:

Alloys have physical properties between those constituent metals and chemical properties remain unaffected. But alloys can be separated physically.

A) Molecular weight (MW)

moles = mass : MW

Answer:

Hydrogen is neither an alkali metal or halogen.

Explanation:

It has the properties of both groups and so it's position is uncertain.

Answer:

46024 j    or    46.024 kj

Explanation:

500 gm * 4.184 j/(gm-C)  * 22 C = 46024 j

The heat energy absorbed by water of mass 500 g and specific heat capacity of 4.184 J/°Cg with a temperature rise to 22 degree celsius is 46024 J.

Specific heat capacity of a substance is the heat energy required to raise the temperature of that substance by one degree celsius per mole. It is an intensive property and does not dependent on the total amount if the substance.

Specific heat capacity of a substance is a constant and water have this value of 4.184 J/°Cg. The heat energy q absorbed or evolved from a system is related to the specific heat capacity C , mass M and temperature change ΔT occured on the system as in equation written below:

q = mC  ΔT .

The heat energy of water of mass 500 g absorbed for a temperature change of 22 °C can be calculated as follows:

q = 500 g × 22 °C × 4.184 J/°Cg

  =  46024 J.

Hence, the total heat of absorption of water for the given mass and temperature change is 46024 J.

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Answer:

Hibernation

Explanation:

deciduous means trees that lose leaves during winter

Answer:

the empirical formula will be CH2

Explanation:

C

[tex] = \frac{66.44}{12} \\ = \frac{5.536}{5.536} \\ = 1 \\ = 1 \\ h \\ \frac{10.45}{1} \\ = \frac{10.450}{5.536} \\ = 1.88 \\ = 2[/tex]

Answer:

28.83dm³

Explanation:

Using ideal gas equation

PV=nRT

P=2.80atm

n=2.30

R=0.082

T=155°C (155+273=428Kelvin)

V=nRT/P

V=2.30×0.082×428/2.80

V=28.83dm³

Answer:

9.03*10^23 molecules CH4

Explanation:

In the equation CH4 + O2 -> CO2 + 2H2O, the molar ratio of CH4 to CO2 is 1:1. It takes 1 mole of CH4 burned to form 1 mole of CO2. If we convert molecules to moles, we do 9.03 x 10^23 divided by 6.02 x 10^23 = 1.5 moles of CO2. Since we know the ratio is 1:1, that meant it would take 1.5 moles of CH4 burned to make that much CO2. So we convert our 1.5 moles of CH4 into molecules by multiplying 1.5 * 6.02 x 10^23 which equals 9.03*10^23 molecules CH4.

Answer:

2kci,3H12,702,c02g k 4 t v6vuvi

Answer:

urban heat island

Explanation:

occurs when a city experiences much warmer temperatures than nearby rural areas.

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The combination of glue and water creates a physical change rather than a chemical change.

Physical changes are changes to the physical properties of materials and are usually reversible.

Chemical changes, on the other hand, are changes to the chemical properties of materials and are usually irreversible.

Mixing water with glue will only result in the glue being diluted with water and creates no chemical reaction. The glue can be recovered by distilling off the water.

Thus, mixing glues with water is only a physical change as the chemical properties of the glue remain intact.

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