If all candles are the same size, which would burn longer?
O a candle with a 750ml beaker as a cover
O a candle with a 250ml beaker as a cover
They would burn the same amount of time
O a candle with a 150mL beaker as a cover

The most common example is the molar volume of a gas at standard temperature and pressure (STP), which is equal to 22.4 L for 1 mole of any ideal gas at 273.15 K and 1 atm of pressure.

Stoichiometry refers to the quantitative relationship between reactants and products. Calculating the quantities of reactants needed to make a given quantity of products, or the quantities of products resulting from a given quantity of reactants, is required in stoichiometric problems. Gas laws must be taken into account for the calculation if one or more reactants or products in a chemical reaction are gases. The findings of ideal gas law applications are often accurate to within 5%. We go over a few key ideas that are crucial for solving Stoichiometry Problems involving Gases in the sections below.

Stoichiometry and gas laws both rely on the mole notion as their foundation. A mole is an exact measurement of a substance. Based on the quantity of identities, a mole is a unit (i.e. atoms, molecules, ions, or particles). The number of identities in a mole of anything is equal to the number of atoms in exactly 12 grams of carbon-12, the most common isotope of carbon.

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Answer:

1.75 moles

Explanation:

According to CaC₂(s) + 2 H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

2 moles of H20 will produce 1 mole of Ca(OH)2

therefore 3.5 moles of H2O will produce 3.5 x (1/2) = 1.75 moles of Ca(OH)2

Rounding to three significant figures, potassium chlorate makes up 55.0% of the mixture by mass.

2 KClO3(s) → 2 KCl(s) + 3 O2(g)

2.04 g O2 × (1 mol O2 / 32.00 g O2) = 0.06375 mol O2

We can determine the quantity of KClO3 in the sample by calculating the amount of O2 produced by 2 moles of KClO3:

0.04250 mol KClO3 = 0.06375 mol O2 (2 mol KClO3 / 3 mol O2)

Percent by mass of KClO3 = (0.04250 mol KClO3 × 122.55 g/mol KClO3) / 9.51 g × 100% = 55.0%

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The pH of the solution is 2.44.

we first need to write the chemical equation for the dissociation of acetic acid in water:

\(CH_3CO_2H + H_2O - > CH_3CO_2^- + H_3O^+\)

We can use the acid dissociation constant (Ka) for acetic acid to determine the concentration of hydronium ions (H3O+) in the solution, and then use the pH equation to calculate the pH:

Ka = [CH₃CO₂⁻][H₃O⁺] / [CH₃CO₂H]

We know the concentrations of acetic acid and sodium acetate, so we can calculate the concentration of acetate ions ([CH₃CO₂⁻]) using the stoichiometry of the reaction:

[CH₃CO₂⁻] = [NaCH₃CO₂] = 1.50 moles / 1.00 L = 1.50 M

We can assume that all of the acetic acids dissociate into acetate ions and hydronium ions, so the initial concentration of acetic acid is equal to the change in concentration of acetate ions:

[CH₃CO₂H] = 0.300 moles / 1.00 L = 0.300 M

[CH₃CO₂⁻] = [H3O+] = x

Substituting these values into the Ka expression, we get:

1.8 x 10⁻⁵ = (1.50 M)(x) / (0.300 M)

Solving for x, we get:

x = 0.0036 M

Now, we can use the pH equation to calculate the pH:

pH = -log[H₃O+]

pH = -log(0.0036)

pH = 2.44

Therefore, the pH of the solution is 2.44.

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Answer:

(A) Climate Change (B) Climate Change and Plant Communities (C) Effect on Sea Levels (D) Reduction of Biodiversity (E) Effect on Agriculture (F) Effect on Arctic Ecosystems (G) Overall Effect.

Explanation:The increase in temperature will be greatest at high latitudes and over large continents. Climatic changes as a result of global warming will naturally affect the biotic communities on this earth. Rising temperatures will cause glaciers to melt and the polar ice caps to shrink. As mentioned above increased temperatures, inundation of some coastal biological communities and changes in the pattern of distribution of many species over a long period of time are likely to cause reduction in biodiversity in aquatic and terrestrial ecosystems. The global climate change may have important effects on agriculture. Global climate change will have profound effects on arctic ecosystems. The overall effect of global warming on world climate has many dimensions, some of which are discussed above. The natural greenhouse maintains the earth’s temperatures within the limits for physiological functions. But studies suggest that even a moderate increase in the average global temperature could result in significant changes in biotic communities including reduction in biodiversity both in terrestrial and aquatic ecosystems.

Answer:

Environmental Changes

Explanation:

Answer:

d

Explanation:

It is false because NaCl has a higher bond energy than Nal.

The melting point of a substance is determined by the strength of the intermolecular forces between its atoms or ions. In the case of NaCl, the strong electrostatic attraction between the positively charged Na+ ions and the negatively charged Cl- ions results in a relatively high melting point.

In contrast, NaI is a ionic compound with a lower bond energy between the atoms. So, it has lower melting point in comparision to NaCl. So the statement is False, NaCl has a higher melting point than NaI.

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Answer:

The early 2000s had an astronomical rise in wind energy. The largest rise, by far, was between 2000 and 2010, but it also increased by 51% in just three years between 2010 and 2013. Beyond 2020, wind energy is still expected to steadily increase, but not at the astronomical rate of the early 2000s.

Explanation:

Answer:

Wind energy witnessed a meteoric surge in the early 2000s. By far the most significant increase occurred between 2000 and 2010, but it also climbed by 51% in just three years from 2010 and 2013. Wind energy is predicted to continue to grow through 2020, although not at the same astronomical rate as in the early 2000s.

Explanation:

plato (not example answer)

The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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Dipole-dipole interactions between molecules that do not include a covalent bond to a hydrogen atom are known as hydrogen bonds. The attraction between two incredibly electronegative atoms, such N, O, or F, and a hydrogen atom that is covalently bonded to one of them causes it to occur.

Any electronegative atom, such as oxygen, chlorine, or fluorine, may make up the other atom, whereas one of the atoms is hydrogen. Between molecules or between two different molecules, hydrogen bonds can develop between the atoms.

How to determine hydrogen bonding?

Determine whether hydrogen bonds are likely by looking at the molecule's Lewis structure. The electronegative atom needs one or more unshared electron pairs and a negative partial charge, much like oxygen and nitrogen do.

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A 12.1 M HCl solution with a density of 1.19 g/mL has a molality of 16.1 m.

Molality is defined as the total moles of a solute contained in a kilogram of a solvent.

Let's suppose we have 1 L of the solution.

The solution is 12.1 M, that is, there are 12.1 moles of HCl in 1 L of solution.

The molar mass of HCl is 36.465 g/mol.

12.1 mol × 36.465 g/mol = 441 g

The density of the solution is 1.19 g/mL.

1000 mL × 1.19 g/mL = 1190 g

In 1190 g of solution, there are 441 g of HCl.

mWater = 1190 g - 441 g = 749 g = 0.749 kg

b = 12.1 mol / 0.749 kg = 16.1 m

A 12.1 M HCl solution with a density of 1.19 g/mL has a molality of 16.1 m.

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The combined Gas Law equation is represented by B) P1V1 / T1 = P2V2 / T2.

The combined gas law is the law that combines Charles’s law, Gay-Lussac’s law, and Boyle’s law.

Combined gas law can be mathematically expressed as

k = PV/T

Where,

P = pressure

T = temperature in kelvin

V = volume

K  = constant (units of energy divided by temperature)

When two substances are compared in two different conditions, the law can be stated as,

P1V1/T1 = P2V2/T2

Where,

P1 = initial pressure

V1 = initial volume

T1 = initial temperature

P2 = final pressure

V2= final volume

T2 = final temperature

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Answer: It decreases.

Explanation:

The balanced equation is: 4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

The given chemical equation is unbalanced. To balance it, we need to adjust the coefficients in front of each chemical species until the number of atoms on both sides of the equation is equal.

The unbalanced equation is:

2 \(H_2S\)+ 3 \(O_2\)→ \(SO_2\)

Let's start by balancing the sulfur (S) atoms. We have two sulfur atoms on the left side and one sulfur atom on the right side. To balance the sulfur, we can place a coefficient of 2 in front of the \(SO_2\):

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)

Now, let's balance the hydrogen (H) atoms. We have four hydrogen atoms on the left side (2 from each \(H_2S\)) and none on the right side. To balance the hydrogen, we can place a coefficient of 4 in front of the water (H2O) on the right side:

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

Finally, let's balance the oxygen (O) atoms. We have six oxygen atoms on the right side (3 from \(O_2\) and 3 from 2 \(SO_2\)) and three on the left side (2 from \(H_2S\)). To balance the oxygen, we can place a coefficient of 3/2 in front of the O2:

2 \(H_2S\)+ (3/2) \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

To remove the fractional coefficient, we can multiply all coefficients by 2:

4 \(H_2S\) + 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

Now the equation is balanced, with an equal number of atoms on both sides. The balanced equation is:

4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

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Answer: Electrons

Explanation:

Taking into account the reaction stoichiometry, 163.67 grams of C  is needed to reduce Al₂O₃ to produce 491 grams of pure aluminum.

In first place, the balanced reaction is:

2 Al₂O₃ + 3 C → 4 Al + 3 CO₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if 108 grams of Al are produced by 36 grams of C, 491 grams of Al are produced by how much mass of C?

mass of C= (491 grams of Al× 36 grams of C)÷ 108 grams of Al

mass of C= 163.67 grams

Finally, 163.67 grams of C is required.

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Answer:

Cellular respiration is used to create usable energy from the foods that living things eat. It's important to know that the reactions involved in cellular respiration are catabolic, meaning they break down molecules into smaller ones. This differs from anabolic reactions, which build bigger molecules from smaller ones

The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

D

Explanation:

cause overall charge is +1 so will attract

An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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Baking soda or bicarbonate of soda, often known as sodium bicarbonate (IUPAC name: sodium hydrogencarbonate , is a chemical substance having the formula NaHCO3.

It is a salt made up of the bicarbonate anion (HCO3) and the sodium cation (Na+). Sodium bicarbonate is a white, crystalline solid that frequently takes the form of a fine powder.

It tastes somewhat alkaline and salty, like washing soda. Nahcolite is the natural mineral form. It is dissolved in many mineral springs and is a part of the mineral natron.

The salt is known by several names, including baking soda, bread soda, cooking soda, and bicarbonate of soda, and is frequently found next to baking powder in supermarkets due to its long history and widespread use.

Therefore, Baking soda or bicarbonate of soda, often known as sodium bicarbonate (IUPAC name: sodium hydrogencarbonate , is a chemical substance having the formula NaHCO3.

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The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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If a sample transmits 75% of the incident light, its absorbance would be 0.125 Au.

The absorbance of a sample is calculated from the percentage of incident light transmitted using the following formula:

Absorbance = 2 – log(%T), where %T = percentage of incident light transmitted.

In this case, %T = 75, the formula becomes:

Absorbance = 2 - log 75

                         = 2 - 1.875

                               = 0.125 Au

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Answer:

just awser

eeww

Explanation:

Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

THANKS

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Answer:

a. aluminum

Explanation:

Given electronic configuration:

       1s² 2s² 2p⁶ 3s² 3p¹  

The number of electrons can be determined from adding the powers or superscripts.

Since we are dealing with a neutral element, the number of electrons and protons are the same. So we can determine the atomic number which is the number of protons.

Number of electrons  = 2 + 2 + 6 + 2 + 1  = 13

The element with atomic number 13 is aluminum.

The given electronic configuration adds up to 13 which is the atomic number of aluminium.Thus, the correct option is A.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable. Aluminium has the given electronic configuration.

Thus, the correct option is A.

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Answer:

0.00000000910938;

9.109380 * 10^-9

Explanation:

Given the question :

Given :

1.602176*10-¹⁹/ 1.758820*10¹¹

The numbers are expressed in the form:

A * 10^b ; Where;

A = Coefficient ; 10 = base ; b = exponent

The Coefficients can be divided directly as :

1.602176 / 1.758820 = 0.9109380

Using the division law of indices, the exponents acn be worked out as follows since they have the same base :

10^-19 / 10^-11 = 10^(-19 - (-11)) = 10^(-19+11) = 10^-8

Thus, we have ;

0.9109380 × 10^-8

In standard form:

9.109380 * 10^-9

In Expanded form:

10^-8 = 0.00000001

0.9109380 * 0.00000001 = 0.00000000910938

0.000000009 +

0.0000000001 +

0.00000000000 +

0.000000000009 +

0.0000000000003 +

0.00000000000008

__________________

0.00000000910938

___________________