Why are alkaline earth metals less reactive than alkali metals.

When the equation is balanced, the coefficient of octane is 2.

A chemical equation is a representation of a chemical reaction in the form of symbols and formulae, where reactants are written on the left and products on the right. An equation must be balanced so that it follows the law of conservation of mass, which states that mass cannot be created nor destroyed in a chemical reaction. There are different ways to balance an equation, but the most common method is using coefficients.

Coefficients are whole numbers that are used to balance the number of atoms or molecules on each side of the equation. In the equation:-

C₈H₁₈ + O₂ → CO₂ + H₂O

there are 8 carbon atoms, 18 hydrogen atoms, and 2 oxygen atoms on the reactant side. On the product side, there are 1 carbon atom, 3 oxygen atoms, and 2 hydrogen atoms. To balance the equation, the coefficient of octane (C₈H₁₈) is set to 1.

This means that there is only 1 molecule of octane in the reaction. The coefficients of oxygen, carbon dioxide, and water are then adjusted accordingly to balance the number of atoms on both sides of the equation. The balanced equation is:-

C₈H₁₈ + 12.5O₂→ 8CO₂ + 9H₂O

or

2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Therefore, the correct option is 2.

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Answer:

the volume of the sound will quarter

Explanation:

As you move far away from the source, the loudness of sound decreases. This is because as the distance from the source increases, the area it covers also increases thereby spreading the energy over a great area leading to lesser loudness and intensity.

As a result of this, sound intensity follows an inverse square law:

I ∝ 1/d²; where I is the intensity and d is the distance from source.

Therefore If a speaker is moved from 2 feet away to 4 feet away (increment of 2 feet), the volume of the sound would quarter (1/2² = 1/4)

Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

To prepare 2.40 L of 0.500 M NaOH solution from an 8.25 M NaOH solution, you need to determine the volume of the concentrated solution required.

You can use the dilution equation:
M1 × V1 = M2 × V2
where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
Here, M1 = 8.25 M, M2 = 0.500 M, and V2 = 2.40 L. You need to solve for V1:
8.25 M × V1 = 0.500 M × 2.40 L

Rearrange the equation to find V1:
V1 = (0.500 M × 2.40 L) / 8.25 M
V1 = 1.20 L / 8.25
V1 ≈ 0.145 L or 145 mL

So, to prepare 2.40 L of 0.500 M NaOH solution, you must dilute 145 mL of 8.25 M NaOH solution.

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Answer:

B.)changes in dietary intake, lifestyle, and disease risk to match those of a new country,

Answer:I think it might be 6????

Explanation: I could be totally wrong so I apologize if so

The ph of a buffer solution prepared with 0.055 m sodium acetate and 0.01m acetic acid at the pka value of acetic acid is 4.76 at 250c is 5.5.

A weak acid and its conjugate base, or vice versa, are combined to form an aqueous solution known as a buffer solution (more specifically, pH buffer or hydrogen ion buffer). A little bit of a strong acid or base applied to it barely affects its pH.

Strong acids or bases applied in modest amounts don't cause buffer solutions to shift pH. An illustration of a buffer made up of a weak acid and its salt is a solution of acetic acid and sodium acetate CH3COOH + CH3COONa.

The three primary buffer systems in the human body are the phosphate, protein, and carbonic acid bicarbonate systems.

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The concentration of gold in the sample solution is 0.50 mg/L for the spiked sample with 2.50 mL of the standard solution, 1.00 mg/L for the spiked sample with 5.00 mL of the standard solution, and 2.00 mg/L for the spiked sample with 10.00 mL of the standard solution.

To calculate the concentration of gold in the sample solution, use the method of standard addition. The emission intensity of gold is measured at different volumes of the standard solution added to the sample solution. By comparing the emission intensity at different volumes with the blank solution, determine the concentration of gold in the sample.

Let's denote:

V_blank = Volume of the blank solution added to the sample (0.00 mL)

V_standard = Volume of the standard solution added to the sample (2.50 mL, 5.00 mL, or 10.00 mL)

I_blank = Emission intensity of the blank solution (counts)

I_standard = Emission intensity of the spiked sample with the standard solution (counts)

Using the equation:

C_sample = (C_standard × V_standard) / V_sample

Where:

C_sample = concentration of gold in the sample

C_standard = concentration of gold in the standard solution (10.0 mg/L)

V_standard = volume of the standard solution added to the sample (in mL)

V_sample = volume of the sample solution (50.0 mL)

Calculate the concentration of gold in the sample for each spiked sample.

For V_standard = 2.50 mL:

C_sample = (10.0 mg/L × 2.50 mL) / 50.0 mL = 0.50 mg/L

For V_standard = 5.00 mL:

C_sample = (10.0 mg/L × 5.00 mL) / 50.0 mL = 1.00 mg/L

For V_standard = 10.00 mL:

C_sample = (10.0 mg/L × 10.00 mL) / 50.0 mL = 2.00 mg/L

Therefore, the concentration of gold in the sample solution is 0.50 mg/L for the spiked sample with 2.50 mL of the standard solution, 1.00 mg/L for the spiked sample with 5.00 mL of the standard solution, and 2.00 mg/L for the spiked sample with 10.00 mL of the standard solution.

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Answer:

I just looked up the types of matter energy has.

Explanation:

I believe the answer is D.

Sally's list of matter that have energy is not complete as all the types of matter have energy as all matter have mass , and mass and energy are related, so she should have added gases and solids to her list.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of the  same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.

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Answer:

13 Neutrons

Explanation:

Answer:

14 neutrons!

Explanation:

The mass number is the total number of protons and neutrons in a nucleus. The atomic number is the number of protons in the nucleus.

So... 27−13=14 neutrons

The absolute amount of the discrepancy or simply error between the measured value and the actual value is multiplied by 100 and divided by the actual value to determine the percent error.

Follow these easy procedures to determine the error rate-

1. Don't take into consideration any minus (-) signs when calculating the inaccuracy (by deducting the predicted value from the actual value). take the error's absolute value, etc.

Approximate Value - Exact Value = Absolute Error

2. Subtract the mistake from the accurate figure (sometimes, we may get a decimal number).

3. Relative error is the difference between the precise and approximative values.

4. Add a "%" following the conversion to a percentage (by multiplying by 100).

|Approximate Value - Exact Value|/Exact Value 100% Percent Error

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D) CH3OH

Base is chemical which have hydroxide ion. so CH3OH is base

Answer:

533.12 L

Explanation:

The balanced chemical equation for the decomposition of CaCO₃ is the following:

CaCO₃(s) → CaO(s) + CO₂(g)

According to the equation, 1 mol of CaCO₃ produces 1 mol of gas (CO₂). We convert the moles of CaCO₃ to mass in grams with the molar mass of the compound:

molar mass CaCO₃ = 40 g/mol Ca + 12 g/mol C + (3 x 16 g/mol O)= 100 g/mol

mass of CaCO₃ = 1 mol x 100 g/mol = 100 g CaCO₃

Now, we know that 1 mol of any gas at STP occupies a volume of 22.4 L:

1 mol CO₂ = 22.4 L CO₂

Thus, the stoichiometric ratio is: 22.4 L CO₂/100 g CaCO₃

Finally, we multiply this ratio by the mass of CaCO₃ to calculate how many liters of CO₂ at STP are produced:

2380 g CaCO₃ x 22.4 L CO₂/100 g CaCO₃ = 533.12 L

The 533.12 L of carbon dioxide will be produced at STP if 2380 g of calcium carbonate reacts completely.

The balanced chemical equation for the decomposition of CaCO₃ is the following:

CaCO₃(s) → CaO(s) + CO₂(g)

A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow.

According to the equation, 1 mol of CaCO₃ produces 1 mol of gas (CO₂).

We need to convert the moles of CaCO₃ to mass in grams with the molar mass of the compound:

Molar mass CaCO₃ = 100 g/mol

Mass of CaCO₃ = 1 mol x 100 g/mol = 100 g CaCO₃

Now, we know that 1 mol of any gas at STP occupies a volume of 22.4 L:

1 mol CO₂ = 22.4 L CO₂

Thus, the stoichiometric ratio is:  

\(\frac{22.4 L\; CO_{2} }{100 g \;CaCO_3 }\)

Finally, we multiply this ratio by the mass of CaCO₃ to calculate how many liters of CO₂ at STP are produced:

2380 g CaCO₃ x 22.4 L CO₂/100 g CaCO₃

= 533.12 L

Hence, the 533.12 L of carbon dioxide will be produced at STP if 2380 g of calcium carbonate reacts completely.

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The balanced chemical equation for the standard formation reaction of solid iron(III) oxide is :

4Fe(s)   +  3O₂(g)  ----->   2Fe₂O₃(s)

The iron, Fe reacts with O₂ to form Fe₂O₃, that solid iron(III)oxide.  this is given as :

Fe  +  O₂ ----->   Fe₂O₃

To balance the chemical reaction , the atoms in the reactant will be equal to the  product side

                    reactant                product

Fe                        1                              2

O                             2                          3

now, to balance the equation , multiply 4 in Fe 3 in  O₂ and 2 in Fe₂O₃, we get

4Fe   +  3O₂  ----->   2Fe₂O₃

Thus, The balanced chemical equation for the standard formation reaction of solid iron(III) oxide is :

4Fe   +  3O₂  ----->   2Fe₂O₃

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Answer: simple and complex.

Explanation:These are also called simple sugars. They're found in refined sugars, like the white sugar you see in a sugar bowl. If you have a lollipop, you're eating simple carbs.

Part of the investigation must be measuring the pressure inside the lighter fuel tank.

The pressure of gas measures how compact the gas molecules are. We know that the more compacted the gas molecules are, the more likely the gas will exist in the liquid state.

Hence, part of the investigation must be measuring the pressure inside the lighter  fuel tank.

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Answer:

Percent yield = 94.5%

Theoretical yield =  26.89 g

Answer:

Option B, In a space-filling model of a molecule, the radii of the spheres in a space-filling model are proportional in size to the radii of the atoms

they represent

Explanation:

In a space-filling model of a molecule, atoms are represented as sphere. The radius of the sphere is equal to the radius of the atom and the distance between the center of one sphere to the center of other represents the distance between the atomic nuclei

Option B is correct

Option A is incorrect, as dots are used in the space filling model to represent the atoms

Option C is incorrect because radii of atom do not represents the length of the bonds in a space-  filling model

An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

An atom X has 12 protons and 12 electrons that means X is a neutral atom and the atomic no. is 12 because total no. of protons is equal to atomic number. When it looses the 2 electrons then atom becomes positively charged ion . the charge on the ion is +2.

now, the no. of protons will be = 12

number of electrons will be = 12 - 2 = 10

Thus, An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

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Answer:

A location that is humid, would most likely support a marsh ecosystem.

Explanation:

The Florida Everglades are an example of a marsh :)

"Marshes are a type of wetland ecosystem where water covers the ground for long periods of time. Marshes are dominated by herbaceous plants, such as grasses, reeds, and sedges."

Answer:

560000 cg

Explanation:

5.6 x 10^3 = 5600

1 g = 100 cg

5600 g = 560000 cg

Answer:

There are two different effects. Both a chemical and a physical reasoning are needed to explain what we can see. Both physics and chemistry matter. The initial cancellation effect can confuse the observer. Mathematics plays a role when the chemical equations are balanced. 

Explanation:

hope this helps u:))

Answer: Cr2(SO4)3 its this

Explanation:

The nucleus of an atom is small compared to the size of the atom because of Rutherford's nuclear theory. Rutherford's nuclear theory states that most of the mass of an atom and all of its positive charge are contained in a small core called the nucleus.

This statement is consistent with the fact that the nucleus of an atom is small compared to the size of the atom. Rutherford's nuclear theory states that the nucleus of an atom is small compared to the size of the atom, and, therefore, the nucleus has a relatively low mass compared to the mass of an atom.

Rutherford's nuclear theory states that the nucleus is small but contains about half of the mass of an atom. The nuclear theory was discovered by Ernest Rutherford in 1911.

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The correct answer from the above task about the balanced chemical equation of water formation is given below:

2H₂ + O₂ -- 2H₂O

The correct answer choice is option d.

The chemical reaction above describes a reaction which occurs between hydrogen and oxygen which leads to the formation of water.

That being said, the equation for the chemical reaction of water described above is balanced when we have 2 moles of hydrogen reacting with 1 mole of oxygen to produce 2 moles of water molecules.

In conclusion, it can be deduced that the chemical equation for the formation of water has an equal number of atoms of each participating element from both the reactant and the product side.

Complete question:

Which of the following is a balanced chemical equation describing the formation of water?

a. H₂ + O₂ -- H₂O

b. H₂ + O₂ -- 2H₂O

c. H₂ + 2O₂ -- H₂O

d. 2H₂ + O₂ -- 2H₂O

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Answer:

Geosphere of the Earth system contains most of the planet's mass.

Explanation:

One of the most important is the Carbon Cycle since all of the organisms on Earth are carbon-based life forms. includes all water on the surface of the earth oceans, lakes, rivers, aquifers, and ice. 70% of the earth's surface is covered with water.

Answer:

The cathode is the electrode where reduction takes place.

so

reduction occur in Cathode in an electrochemical cell.

Answer: Cathode

Explanation:

.

The equilibrium will shift to the right, producing more NH₃(g).

When the volume is decreased at a constant temperature, the pressure initially rises. By lowering the pressure, the system will find equilibrium again, and in order to do so, the equilibrium must be moved to the side with the fewest moles of gas. Compared to the reactant side, which has four moles of gas, the product side has just two moles. The equilibrium will move to the right as the volume is decreased (with an initial increase in pressure).

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