a compound contains 28.6 magnesium 14.3 carbon 57.1 oxygen what is the empirical formula

Answer:

Expanding earth and contracting earth

Explanation:

Answer:

A and C

Explanation:

Answer: Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.

So A

Explanation:

This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.

Explanation:

solution is neutral because it added water and water is neutral solution

Answer:

answer is A. a saturated hydrocarbon that has more than 35 carbons in its chain

Explanation:

edge in 2020 :)

The compound which is used to make asphalt is a saturated hydrocarbon that has more than 35 carbons in its chain.

Asphalt is also known by the name of bitumen, its appearance is sticky and black or present in semi solid form of petroleum.

Asphalt is a kind of hydrocarbon means mainly formed by the composition of carbon atoms and hydrogen atoms, but in very trace quantity amount of nitrogen, sulfur and other hateroatoms are also present. It is present in complex form means both saturated and unsaturated or aliphatic and aromatic compounds are present in it. It is formed by the long carbon chain which has a number of Carbon atoms around 150.

Hence it is a saturated hydrocarbon that has more than 35 carbons.

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Answer:

3.5 g CO2

Explanation:

A hummingbird emits up to 3.5 grams of CO2 a day.

Equation:7.9 x 10‒2mol CO2x (44.01 g CO2/ 1 mol CO2)

=3.5 grams

Hope this helps!

Answer:

Yes

Explanation:

What's the question?

Answer:

yes, they both use it to fllight.

Explanation:

As they are adapted to flight to various places to catch their prey and be safe from various type of harms.

hope it helps..

Answer:

To find the number of molecules first find the number of moles.

number of moles (n) = mass / molar mass (M)

then use the formula

N = n × L

where n = number of moles

N = number of entities

L = Avogadro's constant = 6.02 × 10^23entities to find the number of molecules

A. 4.9 g H2O

m = 4.9g

M = (2*1)+(16×1) = 2 + 16 = 18g/mol

n = 4.9/18 = 0.272mol

N = 0.272 × 6.02 × 10^23

= 1.6374*10^23 molecules of H2O

B. 54.4g of N2

m = 54.4g

M(N2) = 14×2 = 28g/mol

n = 54.4/28 = 1.942mol

N = 1.942 * 6.02*10^23

= 1.1690*10^24 molecules of N2

C. 89 g CCI4

m = 89g

M(CCl4) = 12 + (35.5 × 4) = 154g/mol

n = 89/154 = 0.577mol

N = 0.577 × 6.02 × 10^23

= 3.473*10^23 molecules of CCl4

D. 11 g C6H12O6

m = 11g

M(C6H12O6) = (12×6)+(12×1)+(16×6) =

180g/mol

n = 11/180 = 0.0611mol

N = 0.0611 × 6.02×10^23

= 3.678*10^22 molecules of C6H12O6

Hope this helps

Answer:

A. 210 cm³

B. 10.5 cm³

Explanation:

It is important for us to note that air contains 21% of oxygen, O2. With this idea in mind, let us answer the questions given above.

A. Volume of air = 1000 cm³

Volume of O2 in air =.?

Percentage composition of O2 in air = 21%

Volume of O2 = 21% x 1000

Volume of O2 = 21/100 x 1000

Volume of O2 = 210 cm³

Therefore, the volume of O2 in 1000 cm³ of air is 210 cm³.

B. Volume of air = 50 cm³

Volume of O2 in air =.?

Percentage composition of O2 in air = 21%

Volume of O2 = 21% x 50

Volume of O2 = 21/100 x 50

Volume of O2 = 10.5 cm³

Therefore, the volume of O2 in 50 cm³ of air is 10.5 cm³.

Answer:

6.3 atm.

Explanation:

Data obtained from the question include:

Initial pressure (P1) = 6 atm

Initial temperature (T1) = 15°C = 15°C + 273 = 288K

Final temperature (T2) = 30°C = 30°C + 273 = 303K

Final pressure (P2) =..?

Since the volume and number of mole of the hydrogen gas sample is constant, the following equation will used to obtain the new pressure:

P1/T1 = P2/T2

6/288 = P2 /303

Cross multiply

288 x P2 = 6 x 303

Divide both side by 288

P2 = (6 x 303) /288

P2 = 6.3 atm

Therefore, the new pressure of the hydrogen gas sample is 6.3 atm.

Answer:B

Explanation:

TOOK DA TEST

As the firework releases heat, it is considered as exothermic reaction. The correct option is B.

An exothermic reaction is one in which the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products.

Energy is constantly released during an exothermic reaction, often in the form of heat. Exothermic reactions characterize all combustion reactions.

Endothermic reactions are chemical reactions that produce products by absorbing heat energy from their surroundings.

Exothermic reactions are important in forensic science, particularly in the investigation of fires and explosions.

Endothermic refers to a chemical reaction that requires heat and results in cooling of the surroundings.

As fireworks are releasing energy in the form of heat, it can be called as an exothermic reaction.

Thus, the correct option is B.

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Answer:

Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..

Angular momentum Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of  will be -2, -1, 0, +1, +2.

Answer:

Principal Quantum Number: designates the principal electron shell. Angular Momentum Quantum Number-This quantum number determines it's shape of an orbital and thus it's angular distribution. This quantum number determines the number of orbital numbers, their orientation within the sub-shell.

Principal Quantum Number, n

It describes the size of its orbital and of the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..  

ngular Momentum Quantum Number l

It describes the shape of the orbital and thus the angular distribution. It can take  from 0 to (n - 1). That is l = 0,1,2,...,(n - 1)

The magnetic Quantum Number, m  

It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of  will be -2, -1, 0, +1, +2.

Explanation:

Answer:

5

Explanation:

Distilled water has a pH of 7 while CO2 is slightly acidic and therefore if we combine both substances we should get a pH just below 7 which if 5

Answer:

A) 5

Explanation:

5

The pH of distilled water immediately after distillation is 7, but within hours after distillation, it has absorbed carbon dioxide from the atmosphere and become acidic with a pH of 5

Answer:

Heat is released during the process.

Explanation:

From the information provided in question, the enthalpy of formation of water is –285.8 kJ/mol. This is simply an exothermic reaction.

The negative sign indicates that the enthalphy of the reactants is more than the enthalphy of the products and as such, heat is released from the system into the surroundings.

The enthalpy of formation of water is –285.8 kJ/mol means that heat is released during the process.

The enthalpy of formation of a substance is the amount of heat given off or absorbed when one mole of a substance is formed from the reactants.

A positive value for enthalpy means the reaction is endothermic while a negative value for enthalpy means the reaction is endothermic.

Therefore, the enthalpy of formation of water is –285.8 kJ/mol means that the reaction is exothermic and heat is released during the process.

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Answer:

Explanation:

Hope it helps.

Answer : The formula for each of the following is:

(a) [tex]C_{22}H_{46}[/tex]

(b) [tex]C_{17}H_{34}[/tex]

(c) [tex]C_{13}H_{24}[/tex]

Explanation :

The general formula of alkanes is [tex]C_n H_{2n+2}[/tex] where n is the number of the carbon atoms present in a molecule of alkane.

The general formula of alkenes is [tex]C_n H_{2n}[/tex] where n is the number of the carbon atoms present in a molecule of alkene.

The general formula of alkynes is [tex]C_n H_{2n-2}[/tex] where n is the number of the carbon atoms present in a molecule of alkyne.

(a) An alkane with 22 carbon atoms

Putting n = 22 in the general formula of alkane, we get the formula of alkane as, [tex]C_{22}H_{2(22)+2}[/tex] or [tex]C_{22}H_{46}[/tex]

(b) An alkene with 17 carbon atoms

Putting n = 17 in the general formula of alkene, we get the formula of alkene as, [tex]C_{17}H_{2(17)}[/tex] or [tex]C_{17}H_{34}[/tex]

(c) An alkyne with 13 carbon atoms

Putting n = 13 in the general formula of alkyne, we get the formula of alkyne as, [tex]C_{13}H_{2(13)-2}[/tex] or [tex]C_{13}H_{24}[/tex]

Answer:

[tex]\huge \boxed{{C_{22} H_{46} \ \ \ \ C_{17} H_{34} \ \ \ \ C_{13} H_{24}}}[/tex]

Explanation:

[tex]alkanes \ \Rightarrow \ C_n H_{2n+2}[/tex]

[tex]C_{22} H_{2(22)+2}[/tex]

[tex]C_{22} H_{44+2}[/tex]

[tex]C_{22} H_{46}[/tex]

[tex]alkenes \ \Rightarrow \ C_n H_{2n}[/tex]

[tex]C_{17} H_{2(17)}[/tex]

[tex]C_{17} H_{34}[/tex]

[tex]alkynes \ \Rightarrow \ C_n H_{2n-2}[/tex]

[tex]C_{13} H_{2(13)-2}[/tex]

[tex]C_{13} H_{26-2}[/tex]

[tex]C_{13} H_{24}[/tex]

Answer:

Jeweler B = more accurate

Jeweler A = more precise

Error:

0.008, 0

% error :

0.934% ; 0

Explanation:

Given that:

True mass of nugget = 0.856

Jeweler A: 0.863 g, 0.869 g, 0.859 g

Jeweler B: 0.875 g, 0.834 g, 0.858 g

Official measurement (A) = 0.863 + 0.869 + 0.859 = 2.591 / 3 = 0.864

Official measurement (B) = 0.875 + 0.834 + 0.858 = 2.567 / 3 = 0.8556

Accuracy = closeness of a measurement to the true value

Accuracy = true value - official measurement

Jeweler A's accuracy :

0.856 - 0.864 = - 0.008

Jeweler B's accuracy :

0.856 - 0.856 = 0.00

Therefore, Jeweler B's official measurement is more accurate as it is more close to the true value of the gold nugget.

However, Jeweler A's official measurement is more precise as each Jeweler A's measurement are closer to one another than Jeweler B's measurement which are more spread out.

Error:

Jeweler A's error :

0.864 - 0.856 = 0.008

% error =( error / true value) × 100

% error = (0.008/0.856) × 100% = 0.934%

Jeweler B's error :

0.856 - 0.856 = 0 ( since the official measurement as been rounded to match the decimal representation of the true value)

% error = 0%

The element does NOT forms a covalent bond is A

A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.

These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Therefore, The element does NOT forms a covalent bond is A

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Answer:

The elements with the lowest ionization energy of all element are alakli metals

Explanation:

According to research,

The element with the lowest ionization energy is cesium (Cs). Cesium has atomic number 55 and is in the fifth row of the periodic table.

Caesium is a soft, silvery-golden alkali metal .

Answer:

O chemical change  because a temperature change was observed, which indicated that the water

Explanation:

I have taken this class

Answer:

14.40g of H2

Explanation:

The balanced equation for the reaction is given below:

B2H6(g) + 6H2O(l) → 2H3BO3(s) + 6H2(g)

Next, we shall determine the mass of B2H6 that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:

Molar mass of B2H6 = (2x11) + (6x1) = 28g/mol

Mass of B2H6 from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 6 x 2 = 12g

From the balanced equation above,

28g of B2H6 reacted to produce 12g of H2.

Finally, we shall determine the mass of H2 produced when 33.61g of B2H6 reacted with excess water. This can be obtained as follow:

From the balanced equation above,

28g of B2H6 reacted to produce 12g of H2.

Therefore, 33.61g of B2H6 will react to produce = (33.61 x 12)/28 = 14.40g of H2.

Therefore, 14.40g of H2 were produced from the reaction.

Answer:5.1g

Explanation:number of moles of Na2co3 is 0.0485 and it molar mass = 23×2+12+16×3=106

n=m/M

Therefore m= n×M

m= 0.0485×106

=5.141g

The mass of 0.0485 moles of Na2CO3 of 5.141 grams.

Mass is defined as a dimensionless number used to describe the mass of a particle or item.  Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term. The strength of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram serves as the SI's fundamental mass unit. Mass is a physical body's total amount of matter. Gravity and inertia, which are the two main forces influencing how objects move in space, make mass crucial.

Mass can be calculated as

Mass = molar mass x number of moles

Molar mass = 23 x 2 + 12 + 16 x 3

                    = 106 grams

Mass = 106 x 0.0485

         = 5.141 grams

Thus, the mass of 0.0485 moles of Na2CO3 of 5.141 grams.

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Answer:

Polar Zones - Coldest Temperature

Temperate Zones - Moderate Temperature

Tropical Zones - Hottest Temperature

Explanation:

The closer you are to the Equator, the hotter it gets, as the sun hits the middle of the Earth the most. At the poles, the sun hits it there the least, so it is the coldest. In between, we would have a mild between hot and cold.

*Remember that the Earth is at a tilt, and that is why we have seasons and why the Equator is so hot and the Poles are so cold.

Answer:

I answered the question on edmentum and that person was correct.

Explanation:

The polar zone is the coldest because the Sun’s rays hit this part of Earth at a wide angle, causing their energy to be spread thinly over a large surface area.

The topical zone is the hottest because the Sun’s rays hit this part of Earth nearly straight on, focusing the heat on a small surface area.

The temperate zone experiences moderate temperatures because the Sun’s rays hit this zone at an angle that concentrates the heat on a surface area that is smaller than on the polar zone and larger than on the tropical zone.

Answer:

B. Alpha

Explanation:

Alpha decays always split into an element and He.

Beta decays always split into an element and e- (eletrons).

Gamma decays always split into an element and radiation.

Answer:

it will attract an object that has a negative charge

Positively charged objects will attract negatively charged objects.

According to the law "like charges repel, unlike charges attract', a positively charged substance will repel other positively charged substances.

On the other hand, a positively charged substance will attract every other substance that is negatively charged.

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Answer:

N for chlorate ion is one

Explanation:

Because N is the number of electrons needed to form octet structure causing a negative charge of one, since it already has 25valence electrons

Answer: 26

Correct Answer

Answer:

overgrazing

Explanation:

The main cause of desertification is Overgrazing.

Desertification is a type of dryland land degradation in which biological production is lost as a result of natural processes or human activity, causing productive areas to become progressively arid.

Overgrazing by the animals makes the land dry and loss in the vegetation.

Hence Overgrazing is the cause of desertification.

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Answer:

They could cause an organism and population and species to die.

Explanation:

If the asteroid hits on ground, there would be a colossal amount of dust thrown up into the atmosphere and our world. If it hits in water and ocean , then there would be a huge surge in water vapor in the atmosphere. This would result in an increase in rain resulting in landslides and mudslides

Answer:

D

Explanation:

total mass should be equal on both sides

it's a double do displacement reaction

HCl + NaOH --> NaCl + H2O