What is true about constructive interference?A.Amplitudes in the opposite direction interfere to make larger waves.B.Amplitudes in the same direction interference to larger waves.C.Amplitudes in the same direction interference to make smaller waves.

a) The balanced reaction equation is; \(2H_{2} O_{2} ----- > 2H_{2} O + O_{2}\)

b) The partial pressure of oxygen is 742.5 torr

c) The number of moles of oxygen gas produced is 0.0144 moles

d) The percentage of the hydrogen peroxide is 6%

We know that we can be able to use the information that have been provided to obtain the number of moles of the oxygen gas.

We now have to write the balanced reaction equation as follows; \(2H_{2} O_{2} ----- > 2H_{2} O + O_{2}\)

Now;

2 moles of hydrogen peroxide produces 1 mole of oxygen

0.24 moles of hydrogen peroxide produces 0.24 moles * 1 mole /

= 0.12 moles

Volume of the gas produced = 176.23 mL or 0.17623 L

Partial pressure of oxygen gas  produced = 761.4 torr - 18.9 torr = 742.5 torr or 0.98 atm

Temperature of the gas = 21.2oC + 273 = 294.1 K

Number of moles of the oxygen gas is obtained from;

PV = nRT

n =PV/RT

n = 0.98 * 0.17623 L/0.082 * 294.1

n = 0.173/24.1

n = 0.0072 moles

Since 2 moles of hydrogen peroxide produces 1 mole of oxygen

x moles of hydrogen peroxide produces 0.0072 moles of oxygen

x = 2 moles * 0.0072 moles/ 1 mole

= 0.0144 moles

Mass of the hydrogen peroxide =

0.0144 moles * 34 g/mol

= 0.49 g

Percentage of hydrogen peroxide in the sample = 0.49 g/8.15 g * 100/1

= 6%

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Answer:

Does the Big Bang theory count?

Answer:

The balanced chemical equation for the reaction of NaHCO3 and Ca(H2PO4)2 is:

2 NaHCO3(aq) + Ca(H2PO4)2(aq) → Na2HPO4(aq) + CaHPO4(aq) + 2 CO2(g) + 2 H2O(l)

From the equation, we see that 2 moles of NaHCO3 produce 2 moles of CO2. Therefore, 1 mole of NaHCO3 produces 1 mole of CO2. We can use the molar mass of NaHCO3 to convert from moles to grams.

The molar mass of NaHCO3 is:

Na: 1 x 22.99 g/mol = 22.99 g/mol

H: 1 x 1.01 g/mol = 1.01 g/mol

C: 1 x 12.01 g/mol = 12.01 g/mol

O: 3 x 16.00 g/mol = 48.00 g/mol

Total molar mass = 22.99 + 1.01 + 12.01 + 48.00 = 83.01 g/mol

One kilogram (1000 g) of baking powder contains 168 g of NaHCO3. Therefore, one kilogram of baking powder contains:

1000 g baking powder × (168 g NaHCO3 / 1000 g baking powder) = 168 g NaHCO3

To produce 2.2 L of CO2 at baking temperature, we need:

2.2 L CO2 × (1.20 g CO2 / 1 L CO2) = 2.64 g CO2

Since 1 mole of NaHCO3 produces 1 mole of CO2, we need 2.64 g of NaHCO3 to produce 2.64 g of CO2. This corresponds to:

2.64 g NaHCO3 × (1 mol NaHCO3 / 83.01 g NaHCO3) × (1 kg baking powder / 168 g NaHCO3) = 0.0198 kg baking powder

Therefore, we need 0.0198 kg, or 19.8 g, of baking powder to generate 2.2 L of CO2 at baking temperature.

Explanation:

When a balloon is placed in the freezer, where the temperature is lower than the ambient temperature, several changes occur due to the decrease in temperature.

Firstly, as the temperature decreases, the kinetic energy of the gas molecules inside the balloon decreases as well. This reduction in kinetic energy leads to a decrease in the average speed of the gas molecules. Consequently, the gas molecules collide with the inner surface of the balloon less frequently and with less force.

Secondly, the decrease in temperature causes the gas molecules to lose energy and move more slowly. As a result, the volume of the gas inside the balloon decreases. This is because the gas molecules occupy less space as their movement becomes restricted due to the decrease in kinetic energy.

However, since the balloon is tied off and its mass remains constant, the total number of gas molecules inside the balloon does not change. As the volume decreases, the gas molecules become more densely packed within the balloon.

The decrease in temperature also leads to a decrease in the pressure exerted by the gas inside the balloon. According to the ideal gas law (PV = nRT), where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature, if the volume decreases while the number of gas molecules remains constant, the pressure will also decrease.

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Answer:

The question is incomplete, the complete question is:

A certain substance X has a normal freezing point of  and a molal freezing point depression constant . A solution is prepared by dissolving some glycine in 950. g of X. This solution freezes at  . Calculate the mass of urea that was dissolved. Round your answer to 2 significant digits.

Answer: The mass of glycine that can be dissolved is

Explanation:

Depression in the freezing point is defined as the difference between the freezing point of the pure solvent and the freezing point of the solution.

The expression for the calculation of depression in freezing point is:

OR

          ......(1)

where,

Freezing point of pure solvent =

Freezing point of solution =

i = Vant Hoff factor = 1 (for non-electrolytes)

= freezing point depression constant =

= Given mass of solute (glycine) = ?

= Molar mass of solute (glycine) = 75.07 g/mol

= Mass of solvent = 950. g

Putting values in equation 1, we get:

Hence, the mass of glycine that can be dissolved is

Answer:

A. Antoine Lavoisier

Explanation:

He is know for creating the first chemical textbook. This textbook included rules for naming different chemical compounds, which is the still the same method we use to this day.

Hoped this can help! :D

Answer:

a

Explanation:

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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Answer:

c. main energy level of an electron

Explanation:

An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are considered to be the building blocks of matter and as such defines or determines the structure of a chemical element.

Generally, atoms are typically made up of three distinct particles and these includes; protons, neutrons and electrons.

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

The principal quantum number, denoted by n, represents the main or overall energy level of an electron.

Basically, this property of an electron determines its energy level, as well as its distance from the nucleus of an atom of any chemical element. Also, as the distance of each orbital from the nucleus increases, the energy level increases respectively. Thus, sets of orbitals having the same principal quantum number (n) are generally referred to as an electron shell.

The fundamental nature of strategic management requires the awareness & understanding of outside forces & encourages strategic managers to adopt new ideas is known as Adaptation.

Three definitions of adaptability are connected. First, natural selection, a dynamic evolutionary process, adapts organisms to their environments, improving their evolutionary fitness. Second, it is a state that the populace has attained along that process. Thirdly, it is a phenotypic characteristic or adaptive trait that has been preserved and has evolved via natural selection and has a functional purpose in each individual organism.

History has recorded descriptions of adaptation going back to the time of the ancient Greek philosophers Empedocles and Aristotle. Natural theology of the 18th and 19th centuries saw adaptation as proof of the presence of a deity.

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Answer:

1 cg = 10 mg

Explanation:

So, 89cg = 89 * 10 = 890mg!

Pls thank, 5star, and brainliest!

Answer:i think its Humans can cause some animals to become extinct, changing the food chain.

Explanation:

18.3 g of solid precipitate formed during the reaction.

Formula of lead(ii) perchlorate = \(Pb(ClO4)_{2}\)

Formula of  sodium sulfate = \(Na_2(SO_4)\)

Reaction of lead(ii) perchlorate and sodium sulfate

\(Pb(ClO4)_{2}\) + \(Na_2(SO_4)\)    ---------->  \(PbSO_4(s)\)    + \(2Na(ClO4)_{2}\)

moles of  \(Pb(ClO4)_{2}\)  =  \(\frac{given mass}{ Molar mass}\)

molar mass of \(Pb(ClO4)_{2}\) =207+(35.5+ 16*4)*2

molar mass of \(Pb(ClO4)_{2}\) =207+ 99.5*2

molar mass of \(Pb(ClO4)_{2}\) =406

given mass = 33.17g

moles of  \(Pb(ClO4)_{2}\)  =  \(\frac{given mass}{ Molar mass}\)    

moles of  \(Pb(ClO4)_{2}\) =  \(\frac{33.17}{406}\)  

moles of  \(Pb(ClO4)_{2}\) = 0.0817 moles

molar mass of \(Na_2(SO_4)\)  = 2*23+ 32+ 4*16

molar mass of \(Na_2(SO_4)\)  = 46+32+64

molar mass of \(Na_2(SO_4)\)  = 142

moles of      \(Na_2(SO_4)\)  =      \(\frac{given mass}{ Molar mass}\)    

moles of      \(Na_2(SO_4)\) = \(\frac{8.564}{142}\)  

moles of      \(Na_2(SO_4)\) = 0.0603 moles

since in the above reaction \(Pb(ClO4)_{2}\) is the solid precipitate so we have to find the weight of \(PbSO_4(s)\) formed after the reaction.

Given that the reaction is complete so one of the 2 reactant must completely ends since \(Na_2(SO_4)\) have less number of moles than \(Pb(ClO4)_{2}\)  so , \(Na_2(SO_4)\) will disappear and hence according to Stoichiometry  same number of moles of \(PbSO_4(s)\) will form

so number of moles of \(PbSO_4(s)\) formed = 0.0603

so, the weight of \(PbSO_4(s)\) formed = number of moles formed * molar mass of \(PbSO_4(s)\)

so weight of \(PbSO_4(s)\) formed  =0.0603 * 303

weight of \(PbSO_4(s)\) formed= 18.27 g ≈ 18.3 g

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The volume of the rectangular bar is  the product of its dimensions that is  110 cm³. Then density of the bar weighing 121 g is 1.1 g/ cm³.

Density of a substance is the measure of its mass per unit volume. It describes how closely its particles are packed within a given volume. It is the ratio of mass to the volume.

Volume of an object is the space occupied by the object. For a rectangle block, volume is the product of length, width and height.

Given, l = 8 cm

width = 5.5 cm

height h = 2.5 cm

volume =  l w h = 8 cm ×5.5 cm × 2.5 cm  = 110 cm³

Mass of the bar = 121 g

density = mass/ volume

d = 121 g/110 cm³

  = 1.1g/cm³

Therefore, the density of rectangular bar is 1.1 g/cm³.

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Answer:

48m/s

Explanation:

The graph shows that as mass increases, kinetic energy increases exponentially. This means that as the mass of an object increases, the kinetic energy increases by a larger and larger amount.

This can be seen by the upward sloping line on the graph. This can be seen in the graph by the steepness of the line, which shows that the increase in kinetic energy is growing faster and faster as the mass increases. Additionally, the graph shows that the rate of increase in kinetic energy is greater for lower masses than for higher masses, which indicates an exponential increase. This can be seen by the upward sloping line on the graph.

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The correct order of increasing dipole moment is BCl3 < BIF2 < BClF2.

What is dipole moment?

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The importance of the use of hydrates in fire extinguishers are;

-They keep fire extinguishers dry during shipping and storage.

-They create foams that have high water content to help extinguish fires.

They create high pressure in the cylinder to quickly force out the fire r*tardant.

We know that a fire extinguisher has to do with any device that has been made in such a way that the device can be used to eliminate a flame that is burning. We all know that fore can be very destructive. This implies that it is important to be able to put out the fire so that it does not cause big problems.

The fire extinguisher is composed of certain chemical substances that are able to react together quickly and then be able to quench the flame of the reaction that is going on in the system.

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The given statement, "If a mineral fizzes when it comes into contact with acetic acid, it is probably composed of calcium carbonate (CaCO₃)" is true because When a mineral fizzes upon contact with acetic acid, it is a strong indication that the mineral is composed of calcium carbonate (CaCO₃).

The fizzing occurs due to the release of carbon dioxide gas (CO₂) during a chemical reaction between the acid and the carbonate compound. Calcium carbonate is a common mineral found in various forms such as limestone, marble, and chalk. It is insoluble in water but reacts readily with acids, including acetic acid, which is the main component of vinegar.

The reaction between calcium carbonate and acetic acid can be represented by the following equation:

CaCO₃ + 2CH₃COOH → Ca(CH₃COO)₂ + H₂O + CO₂

In this reaction, calcium carbonate reacts with acetic acid to form calcium acetate, water, and carbon dioxide gas. The release of carbon dioxide gas is responsible for the fizzing observed when the mineral comes into contact with the acid.

Therefore, if a mineral fizzes when it encounters acetic acid, it is likely composed of calcium carbonate (CaCO₃). This fizzing reaction is often used as a simple and effective test to identify the presence of calcium carbonate in minerals or rocks.

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is it amino acids???????

Answer:

copper is the only material composed of a single pure substance

Explanation:

plss mark brainliest

Answer:

1st opt.

(copper is the only material consisting of a single pure substance)

Explanation:

an element is made up of only one type of atom, and copper (Cu) as you can see is a single pure atom whereas salt (NaCl) and vinegar (C2H4O2) are both made of different elements.

Hope this helps

Answer:

\(\Large \boxed{\mathrm{A}}\)

Explanation:

Rust formed from iron and oxygen combining is a chemical change, because in a chemical change, the resulting substance(s) will have different properties from the substance(s) before the chemical change.

I cant comment... So is it Right?

Answer:

Explanation:

Calculating the number of hydrogen atoms in 180 grams of glucose involves using the molecular formula of glucose (C6H12O6) and the Avogadro constant (6.022 x 10^23).

First, calculate the molar mass of glucose by adding the atomic masses of its elements:

C6H12O6 = (6 x 12.01) + (12 x 1.01) + (6 x 16.00) = 180.18 g/mol

Next, use the molar mass to find the number of moles of glucose in 180 grams:

180 g / 180.18 g/mol = 0.999 moles

Finally, multiply the number of moles by Avogadro's constant to find the number of hydrogen atoms:

0.999 mol x 6.022 x 10^23 atoms/mol = 6.02 x 10^23 hydrogen atoms

The increasing order of standard molar entropy (S°) is as follow:

ribose ( C₅H₁₀O₅ ) < Glucose (C₆H₁₂O₆) < sucrose ( C₁₂H₂₂O₁₁ )

Entropy is defined as the randomness of the particle. It depends on temperature and pressure or number of particle per unit volume.

It is directly proportional to the temperature and pressure of the gas.

The standard molar entropy is defined as the entropy content of the one mole of pure substance at the standard state of temperature and pressure of interest.

The standard molar entropy is also defined as the total amount of entropy which 1 mole of the substance acquire, as it is brought from 0K to standard conditions of temperature and pressure.

The standard molar entropy depends on the molas mass of atom, molecules or compound.

ribose ( C₅H₁₀O₅ ) has lower standard molar entropy. Due to less complexity of this molecules.

While, complexity increases from Glucose (C₆H₁₂O₆) to sucrose ( C₁₂H₂₂O₁₁ ). Therefore, the standard molar entropy of sucrose ( C₁₂H₂₂O₁₁ ) is greater than Glucose (C₆H₁₂O₆).

Thus, we concluded that the increasing order of standard molar entropy (S°) is as follow:

ribose ( C₅H₁₀O₅ ) < Glucose (C₆H₁₂O₆) < sucrose ( C₁₂H₂₂O₁₁ )

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Answer:

...

Explanation:

Answer: C

Explanation: I think C bc at 1;30 its full so its going to  be a bit full on the oppiside side

Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

Answer:

Carbon has four valence electrons in its shell carbon can share electrons with up to four different atoms.

Explanation:

Answer:0.477 g/ml

Explanation:

Density=(40.14-33.79)/13.3 ml

Density=6.35/13.3

Density=0.477 g/ml