Oo help it’s for a grade

Answer: 3.6 x 1023 molecules and 0.143 Litres

Answer:

A

Explanation:

edge

Answer:

See explanation

Explanation:

Oxygen has six electrons in its outermost shell. This means that its octet can be completed when it shares two electrons with another oxygen atom.

In a covalent bond, each bonding atom contributes one electron to the bond. This means that four electrons are shared between two oxygen atoms. Each atom contributes a total of two electrons which are shared. This molecule of oxygen satisfies the octet rule rather than a single atom of oxygen.

An image of the oxygen molecule is attached to this answer.

This system of two oxygen atoms joined together in a covalent bond is called an oxygen molecule(O2).

Answer:

I think it's either A or D I'm not sure hope that I helped you.

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And you can learn a lot more! Upload another question and feel free to not be so, ummaculate

Answer:

B. The bonds are polar and the molecule is nonpolar.

Explanation:

Each bond in the molecule is polar, as indicated by the partial charges on the atoms of the molecule. However, the four atoms are arranged symmetrically around the central atom. In this case, the effects of the partial charges on opposite sides cancel out. As a result, the molecule as a whole is nonpolar. If exposed to an electric field, the molecule will not orient itself in any particular direction.

Answer:

iron and carbon:steel:copper and tin: metal

Explanation:

The balanced equation for the reaction between NaOH and H2SO4 is given as;

2NaOH + H2SO4 → Na2SO4 + 2H2O  

2 mol of NaOH reacts with 1 mol of H2SO4

5g of NaOH was dissolved in 1000cm3.

Mass = 5 g

Molar mass = 40 g/mol

Volume = 1000 cm3 = 1 L

Number of moles = Mass / Molar mass

Number of moles = 5 / 40 = 0.125 mol

Molarity = Number of moles / Volume

Molarity = 0.125 / 1 = 0.125 M

25cm3 of this solution neutralized 28.3cm3 of solution containing 7.2gdm-3 of impure H2SO4.

CaVa / CbVb = Na / Nb ; where a = acid and b = base

Va = 28.3cm3

Vb = 25cm3

Ca = ?

Cb = 0.125 M

Na = 1

Nb = 2

I. The molarity of H2SO4

Solving for Ca;

Ca = CbVb * Na / (Va * Nb)

Cb = (0.125 * 25 * 1 ) / ( 28.3 * 2)

Cb = 0.0552 M

II. The concentration of the pure acid on gdm-3

Molarity = Mass conc / Molar mass

Mass Conc = Molarity * Molar mass

Mass Conc = 0.0552 * 98.079

Mass Conc = 5.41 g/dm3

III. % impurity of the acid

Percentage Impurity = Mass of pure / Mass of Impure   *  100

Percentage Impurity = 5..41 / 7.2 * 100

Percentage Impurity = 75.14%

Answer:

C energy source

Explanation:

I got this right

Answer:

c

Explanation:

Answer:

what are the awnser choices

Answer:

[tex]H_5N_5O_6[/tex]

Explanation:

Hello there!

In this case, for the determination of empirical formulas, it is firstly necessary to assume the given percentages of the constituent atoms as the masses so we can compute their moles in the formula:

[tex]n_N=\frac{35gN}{14.01g/mol} =2.5molN\\\\n_H=\frac{5g}{1.01 g/mol}=5molH\\\\n_O=\frac{60g}{16 g/mol} =3molO[/tex]

Thus, we need to divide the resulting moles, by the fewest ones (those of nitrogen) in order to determine the coefficients in the formula:

[tex]N:\frac{2.5}{2.5}=1\\\\H:\frac{5}{2.5}=2\\\\O:\frac{3}{2.5} =1.2[/tex]

However, we need to turn all these numbers, whole numbers, so we multiply by 5 to get:

[tex]H_5N_5O_6[/tex]

Best regards!

Answer:

Ba(NO2)2

Explanation:

Anything that contains calcium comes from a strong acid. Nitrous oxide (NO2) is a weak acid, therefore the salt it makes is less acidic than the rest --> the highest pH :)

Answer:

coal chemicals sun

Explanation:

Proton:

Positive

Found in Nucleus

Mass of 1 AMU

Neutron:

Neutral

Found in Nucleus

Mass of 1 AMU

Electron:

Negative

Found in orbitals

Mass of 0 AMU

Answer:

10 atm.

Explanation:

Using the combined gas law equation as follows;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question,

P1 = 5 atm

P2 = ?

V1 = 4L

V2 = 2L

T1 = 25°C = 25 + 273 = 298K

T2 = 25°C = 298K

Using P1V1/T1 = P2V2/T2

5 × 4/298 = P2 × 2/298

20/298 = 2P2/298

Cross multiply

298 × 20 = 298 × 2P2

5960 = 596P2

P2 = 5960 ÷ 596

P2 = 10 atm.

Answer:

Temporary hardness is a type of water hardness caused by the presence of dissolved bicarbonate minerals (calcium bicarbonate and magnesium bicarbonate). ... However, unlike the permanent hardness caused by sulfate and chloride compounds, this "temporary" hardness can be reduced by boiling the water.

Answer:

20.3 grams

Explanation:

m = n×M = 0.35×(24+(16+1)×2)= 20.3 (g)

✧ [tex] \underline{ \underline{ \large{ \tt{A \: N \:S \: W \: E \: R}}}} : [/tex]

[tex] \underline{ \underline{ \large{ \text{Molecular \: Formulaes}}}} : [/tex]

⇾ [tex] \large{ \text{Potassium \: Hydroxide : K \: OH}}[/tex]

⇾ [tex] \large{ \text{Sodium \: Chloride : NaCl}}[/tex]

⇾ [tex] \large{ \text{Sodium \: Hydroxide : NaOH}}[/tex]

⇾ [tex] \large{ \text{Calcium \: Chloride : CaCl}}[/tex]

⇾ [tex] \large{ \text{Sodium \: Bicarbonate} : \tt{Na ( HCO)_{ 3} }}[/tex]

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

☥ [tex] \underline{ \underline{ \large{ \tt{ \: E \: X\: P \: L\: A\: N \: A \: T \: I \: O \: N}}} }: [/tex]

[tex] \underline{ \underline{ \text{Writing \: a \: molecular \: formula}}} : [/tex]

To write a molecular formula , the following steps are usually adopted only when we know the symbol and valencies of elements and radicals present in a molecule.

Step 1 : First , the name of the compound is written.

Step 2 : The symbols of basic and acidic radicals are written side by side.

Step 3 : The valency of each radical is written at the right upper corner of the symbol. The valency of one radical is transferred to another radical and it is written on the right hand side at the bottom corner. If necessary , L.C.M of the valencies us taken to get a simple whole number.

Step 4 : If a compound radical takes part in the molecular formula , the radical is enclosed in brackets and the valency number is written on the right side of the bracket at the bottom of the formula.

For instance :

[tex] \text{Calcium \: \: \: \: \: \: Sulphate}[/tex] [ compound ]

1. [tex] \sf{Ca \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: SO_{4} }[/tex] [ Symbol of basic and acidic radicals ]

2.We know : Valencies of calcium and sulphate are 2 and 2 respectively

3. [tex] \sf{Ca_{2} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: (SO_{4} )_{2} }[/tex] [ Valencies are exchanged and compound radical is enclosed in bracket ]

4.[tex] \sf{CaSO_{4}}[/tex] [ L.C.M is taken to get molecular formula of calcium sulphate ]

Hope I helped ! ♡

Have a wonderful day / night ! ツ

☄ Let me know if you have any questions regarding my answer !

☥ [tex] \underline{ \underline{ \mathfrak{Carry \: On \: Learning}}}[/tex] !! ✎

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Answer:

0.05 M

Explanation:

First we convert 12 g of NaHSO₄ into moles, using the given molar mass:

We can now calculate the molarity of the resulting solution, using the calculated number of moles and the given volume:

Answer:

The molarity of the resulting NaHSO₄ solution is 0.05 [tex]\frac{moles}{liter}[/tex]

Explanation:

Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

[tex]Molarity=\frac{moles of solute}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

Molar mass is the amount of mass that a substance contains in one mole. Being the molar mass of the compound NaHSO₄ equal to 120.1 g/mole, then the number of moles that 12 grams contain is calculated by:

[tex]12 g*\frac{1 mole}{120.1 g} = 0.1 moles[/tex]

And being 2 L the volume of the solution, then replacing in the definition of molarity you get:

[tex]Molarity=\frac{0.1 moles}{2 L}[/tex]

Molarity= 0.05 [tex]\frac{moles}{liter}[/tex]

The molarity of the resulting NaHSO₄ solution is 0.05 [tex]\frac{moles}{liter}[/tex]

Answer:

C.

two in the reactants and two in the products

Explanation:

The law of conservation of mass helps us balance chemical equations so that there are the same number and type of atoms in the reactants and products.

There are two nitrate ions in Ba(NO3)2 and two in 2LiNO3.

Answer:

it is formed by covalent bonds. the oxygen atom shares one elctron with each chlorine atom, forming single covalent bonds ( cl — o — cl )

there are 12 atoms of mg in the following equations

Answer:

[tex]\boxed {\boxed {\sf 12 \ Mg \ atoms }}[/tex]

Explanation:

We are given this formula:

[tex](Mg_3N_2)_4[/tex]

We want to find the number of magnesium atoms. We can see that there is a subscript of 3 after the magnesium, so there are 3 magnesium atoms in 1 molecule of the compound.

However, there is a subscript of 4 that comes after the entire compound, so there are actually 4 molecules, with each molecule containing 3 magnesium atoms. Multiply 4 and 3.

There are 12 magnesium atoms.

Answer: D: plutonium-239

Explanation: Got it right on the quiz

The table below shows a list of radioisotopes and their half-lives.

A 2-columns table with 10 rows. Column 1 is labeled radioisotope. Column 2 is labeled half-life. Lithium-5, 3 × 10⁻²² seconds; polonium-211, 0.516 seconds; Barium-139, 82.7 minutes; uranium-240, 14.1 hours; Bismuth-210, 5.012 days; uranium 232, 68.9 years; carbon-14, 5730 years; plutonium-239, 24,065 years; beryllium-10, 1.6 × 10⁵ years; uranium-238, 4.5 times 10 to the 9 years.

The radioisotope that has the longest half-life is the best to use in powering planet and space exploration vehicles because they can travel farther. The radioisotope is the best to use is:

d) plutonium-239

Plutonium-239 has the longest half-life of all the radioisotopes listed, at 24,065 years. This means that it will take 24,065 years for half of the plutonium-239 in a sample to decay. This makes it a good choice for powering planet and space exploration vehicles because it will last for a long time.

The other radioisotopes listed have much shorter half-lives. Lithium-5 has a half-life of 3 × 10⁻²² seconds, polonium-211 has a half-life of 0.516 seconds, barium-139 has a half-life of 82.7 minutes, uranium-240 has a half-life of 14.1 hours, bismuth-210 has a half-life of 5.012 days, uranium-232 has a half-life of 68.9 years, carbon-14 has a half-life of 5,730 years, and beryllium-10 has a half-life of 1.6 × 10⁵ years.

So, the best radioisotope to use for powering planet and space exploration vehicles is plutonium-239. It has the longest half-life, which means that it will last for a long time and provide a steady source of power.

To know more about radioisotopes here

https://brainly.com/question/28142049

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Answer:

A

Explanation:

If a convergent boundary involves a continental landmass and an ocean basin, a subduction zone forms. Subduction occurs where a plate moves underneath the other.