Which of these elements is the most ductile?
a. vanadium
b. mercury
c. germanium
d. astatine
e. xenon

Answer:

B. 20, 22, 20

Explanation:

The atomic number (Z) of calcium is 20, that is, it has 20 protons.

The mass number (A) of calcium-42 is 42. The mass number is equal to the sum of protons and neutrons. Then,

p⁺ + n⁰ = 42

n⁰ = 42 - p⁺

n⁰ = 42 - 20

n⁰ = 22

Since calcium is electrically neutral, it has the same number of protons (+) and electrons (-). Then, calcium has 20 electrons.

Answer:

hexane C6H14

IS YOUR ANSWER

Explanation:

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Answer:

See explanation

Explanation:

If we take two nonmetals with little or no electronegativity difference between them, the shared electrons are not attracted greatly towards any of the bonding atoms. In other words, the shared electrons remain equidistant between the nuclei of the two bonding atoms.

The bond is nonpolar since polarity is introduced into covalent bonds by a significant difference in electronegativity of the bonding atoms.

Answer:

3

2

Explanation:

3O2 => 2O3

the equation is balancing

Answer:

c I think but that's only what i think

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 24.088×10²³ atoms of carbon are in sample containing 4.000 moles of carbon. The correct option is option B.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of atoms/molecules/ formula units of carbon= number of moles of carbon × 6.022×10²³

number of moles of carbon= 4 moles

substituting all the given values in the above equation, we get

number of atoms/molecules/ formula units of carbon= 4 × 6.022×10²³

number of atoms/molecules/ formula units of carbon=2.4088×10²⁴ atoms of carbon

There are 2.4088×10²⁴ atoms of carbon

Therefore, 24.088×10²³ atoms of carbon are in sample containing 4.000 moles of carbon. The correct option is option B.

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The relative humidity on a starry summer night is determined as 91%.

The dry bulb depression temperature is calculated as follows;

ΔT = 19⁰C - 18⁰C   =  1⁰C

at dry bulb temperature of 18⁰C and depression temperature of 1⁰C, the relative humidity is determined as 91%.

Thus, the relative humidity on a starry summer night is determined as 91%.

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Explanation:

Given -

molar mass = 135.13 g/mol

To Find -

Solution:

we know that -

So,

Here empirical mass =

12.01 + 1.008 + 14.01 = 27.028

Then,

135.13 = n × 27.028

n = 4.99 ≈ 5

We know that,

Then,

molecular formula = 5(CHN)

= C₅H₅N₅

Therefore,

Option A is correct✔

Answer:

0.97 atm.

Explanation:

From the question given above, the following data were obtained:

Final pressure (P2) = 6.8 atm

Initial temperature (T1) = 40 K

Final temperature (T2) = 280 K

Initial pressure (P1) =?

Thus, we can obtain the initial (original) pressure of the gas as follow:

P1/T1 = P2/T2

P1 /40 = 6.8/280

Cross multiply

P1 × 280 = 40 × 6.8

P1 × 280 = 272

Divide both side by 280

P1 = 272/280

P1 = 0.97 atm

Therefore, the original pressure of the gas is 0.97 atm.

Answer:

daddy chill

Explanation:

Answer:

a

Explanation:

all elemental metals are made up of only one type of element

Answer:

It is 1.

Explanation:

Answer:

1+2=2+1 is the answer for the question

Answer:

Conduction, Convection, and Radiation

Explanation:

I got it right on Edge 2021

the The fill in the blanks should be filled with Conduction, Convection, and Radiation

information regarding heat:

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Hey there!:

Molar mass N₂ = 28.0134 g/mol

28.0134 g ------------------- 22.4 L (at STP )

mass  N₂ -------------------- 50.0 L

mass N₂ = 50.0 x 28.0134 / 22.4

mass N₂ = 1400.67 / 22.4

mass N₂ = 62.529 g

Hope this helps!

Answer:

75%

Explanation:

3/4 is 75% if you multiply by 25

Answer:

The phosphorus ylide reacts with the aldehyde or ketone to make an oxaphosphetane.

Explanation:

The Wittig reaction is a reaction that occurs between a phosphorus ylide and an aldehyde or ketone. The final products are an alkene and triphenyl phosphine oxide.

The first step in the reaction is the attack of the phosphorus ylide on the aldehyde or ketone. This is followed by attack of oxygen on phosphorus to form a [2+2] cycloaddition product (oxaphosphetane)  which  decomposes to form the alkene and triphenylphosphine oxide.

MgBr₂(aq) + Pb(NO₃)₂(aq) → PbBr₂(s) + Mg(NO₃)₂(aq)

The electrolyte in the solution produces ions.

The equation of a chemical reaction can be expressed in the equation of the ions

For strong electrolytes (the ionization rate = 1) is written in the form of separate ions, while the weak electrolyte (degree of ionization <1) is still written as an un-ionized molecule

In the ion equation, there is a spectator ion that is the ion which does not change (does not react) because it is present before and after the reaction

When these ions are removed, the ionic equation is called the net ionic equation

For gases and solids including water (H₂O) can be written as an ionized molecule

A molecular equation is a chemical equation expressed as a molecule

So only the dissolved compound is ionized ((expressed in symbol aq)

Reaction

MgBr₂(aq) + Pb(NO₃)₂(aq) → PbBr₂(s) + Mg(NO₃)₂(aq)

Mg²⁺(aq)+2Br⁻(aq) + Pb²⁺(aq)+2NO₃⁻(aq)⇒PbBr₂(s) + Mg²⁺(aq)+2NO₃⁻(aq)

spectator ions : Mg²⁺(aq) and 2NO₃⁻(aq)

2Br⁻(aq) + Pb²⁺(aq)⇒PbBr₂(s)

The balanced molecular equation:

MgBr₂(aq) + Pb(NO₃)₂(aq) → PbBr₂(s) + Mg(NO₃)₂(aq)

The  complete ionic equation:

Mg²⁺(aq)+2Br⁻(aq) + Pb²⁺(aq)+2NO₃⁻(aq)⇒PbBr₂(s) + Mg²⁺(aq)+2NO₃⁻(aq)

The net ionic equation

2Br⁻(aq) + Pb²⁺(aq)⇒PbBr₂(s)

A chemical equation in which the number of each type of atom is equal on the two sides of the equation. Subscripts - Part of the chemical formulas of the reactants and products that indicate the number of atoms of the preceding element. A reaction that contains the stoichiometric ratios of the reactants and products; these ratios can be used for mole -to-mole conversions.

Thus, the reactions when a magnesium bromide solution is mixed with a lead(II) nitrate solution, a precipitate forms is given above.

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Answer:

20.39 g of O2.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2KClO3 —> 2KCl + 3O2

Next, we shall determine the mass of KClO3 that decomposed and the mass of O2 produced from the balanced equation. This is illustrated below:

Molar mass of KClO3 = 122.4 g/mol

Mass of KClO3 from the balanced equation = 2 × 122.4 = 244.8 g

Molar mass of O2 = 32 g/mol

Mass of O2 from the balanced equation = 3 × 32 = 96 g

Summary:

From the balanced equation above,

244.8 g of KClO3 decomposed to produce 96 g of O2.

Finally, we shall determine the mass of O2 produced from the decomposition of 52 g of KClO3. This can be obtained as follow:

From the balanced equation above,

244.8 g of KClO3 decomposed to produce 96 g of O2.

Therefore, 52 g of KClO3 will decompose to produce =

(52 × 96)/244.8 = 20.39 g of O2.

Thus, 20.39 g of O2 is produced.

Answer:

1Mg + 1Cl2 = 1MgCl2

Explanation:

Hi! When balancing an equation, you want to make sure that there are equal amounts of each element on both sides. When looking at the equation that you provided in the question, look and count how many of each element are on each side. I can see that there is 1 Mg ion on the left and 1 Mg ion on the right. There are also 2 Cl ions on the left and 2 Cl ions on the right. Because they are already equal, the coefficients in front of each compound will be 1. If the amounts were different on each side, that is when you would need to add different coefficients.

Hope this helps! Let me know if you have any other questions about this!

Explanation:

Rate of reaction can be increased by having more surface area.

Therefore,

Option B is correct✔

Answer:

b

Explanation:

Use this formula PV=nRT

Rearrange formula , question want V ,so

V=nRT/P

given

P= 3.00 atm

n=0.450 moles

R is ideal gas constant = 0.08206 L atm mol-¹K-¹

T in Kelvin so , (75 + 273)= 348 Kelvin (K)

Then insert all this information given with that rearranged formula V=nRT/P

Answer:

ooooooooooppppppppppppppppppppppppp

Explanation:

Answer:

The hair color of a person

Explanation:

The correct answer would be the hair color of a person.

Qualitative data are data that cannot be measured with any instrument but can only be used to characterize. Unlike quantitative data, these kinds of data can only be observed and recorded but cannot be assigned numerical values, except if coded.

The sound of a person's voice can be quantitative on one hand and qualitative on the other. The intensity of a sound can be measured using a decibel meter and quantitatively assigned a figure, whereas, the quality of the sound can only be characterized and not measured.

Both the weight and the body temperature of a person can be measured using a weighing balance and a thermometer respectively and hence, are considered to be quantitative data when collected.

The color of the hair of a person cannot be measured but can only be observed and characterized. Hence, hair color data constitute qualitative data.

Answer:

hair color

Explanation:

Answer:

Oxygen is more electronegative than sulphur

Explanation:

Bond angle of a molecule is related to the electronegativity of the central atom. The more electronegative the central atom is, the greater the bond angle.

As electronegativity of the central atom increases, the magnitude of bond pair- bond pair repulsion increases leading to increase in bond angle.

Hence, oxygen, being more electronegative than sulphur asserts a greater bond pair- bond pair repulsion leading to a greater bond angle in water.

Answer:

Water vapor retains the same heat energy.

Answer:

water vapor gives up heat energy.

Explanation:

Took a quiz and got it right

The chemist weigh out 35.51 g Na2SO4

Given

0.250 moles of Na2SO4

Required

weight of Na2SO4

Solution

A mole is a number of particles(atoms, molecules, ions)  in a substance

This refers to the atomic total of the 12 gr C-12  which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles  

Moles of a substance can also be determined from its molecular weight

[tex]\tt mol=\dfrac{mass}{MW}[/tex]

For 0.250 moles of Na2SO4, mass =

[tex]\tt mass=mol\times MW\\\\mass=0.25\times 142,04 g/mol\\\\mass=35.51~g[/tex]

Answer:

See explanation

Explanation:

The equation of the reaction is;

C 2 H 6 O(l)  +  3 O 2 (g)  → 2 CO 2 ( g )  +  3 H 2 O(l )

Next we have to determine the limiting reactant, this reactant gives the least number of moles of product.

Number of moles of C 2 H 6 O = mass/molar mass = 1.86g/ 46.07 g/mol = 0.04 mols

From the equation;

1 mol of ethanol yields 2 mols of CO2

0.04 moles of ethanol yields 0.04 * 2/1 = 0.08 mols of CO2

For water;

1 mol of ethanol yields 3 mols of water

0.04 moles of ethanol yields 3 * 0.04/1 = 0.12 mols of water

Also;

Number of moles of oxygen= 10g/32g/mol = 0.31 moles

3mols of O2 yields 2 moles of CO2

0.31 moles of O2 yields 0.31 * 2/3 = 0.21 moles of CO2

For water;

3 moles of O2 yields 3 moles of water

0.31 moles of O2 yields 0.31 * 3/3 = 0.31 moles of water

Hence ethanol is the limiting reactant.

From  PV=nRT

Volume of CO2 is;

V = nRT/P

V = 0.08 * 0.082 *298/1 = 1.95 L

Volume of water;

V = nRT/P

V= 0.12 * 0.082 * 298/1

V= 2.93 L

Total volume of gases after reaction = 1.95 L + 2.93 L = 4.88 L

Answer:

imma say slime molds

Explanation:

if I'm wrong please tell me

Answer:

algal slime i think

Explanation:

Explanation:

CONGRATULATIONS!!!!!

Answer:

chemistary more lliek dumastry ahaha

Explanation: