MATH AND SCIENCE
Out of around 260,000 known species of angiosperms, approximately 195,000 are dicots. what percentage of angio sperms are dicots

Answer:

That Jupiter's gravitational force is much stronger than Earth's gravitational force.

Answer:

Electron = 6.030 × 10^-21 J.

Proton = 3.37 × 10^-23J.

Methane = 2.06 × 10^-24J.

Gold = 1.67 × 10^-25J.

Explanation:

Without mincing words let's dive straight into the solution to the question above.

One an energy formula will be used in solving this question. This formula is given below;

Energy, E = (n^2 × h^2)/8 × m× L^2.

Where m = mass, n = number of energy level, h = planck's constant and L = length.

Therefore, for electron;

Energy, E = (6.626 × 10^−34)^2/ ( 8 × 9.1 × 10^-31 × [1 x 10^-9m]^2 =6.030× 10^-21J.

For proton;

Energy, E = (6.626 × 10^−34 )^2 / (8

× 1.626 × 10^-27 × [1 × 10^-9]^2) = 3.37 × 10^-23J.

For methane;

Energy, E = (6.626 × 10^-34) ^2/ ( 8 × 2.66 × 10^-26 × [1 × 10^-9]^2 = 2.06 × 10^-24J.

For Gold;

Energy, E =( 6.626 × 10^−34)^2 / ( 8 × 3.27 × 10^-25 × [ 1 × 10^-9]^2) = 1.67 × 10^-25J.

NB: n = 1 = Zero Point Energy.

The two functional groups that the aminoacid has according to the picture are amine and carboxyl.

In chemistry and related areas, a functional group can be defined as a group of atoms bonded in a specific molecule that can affect the was the molecule reacts or the specific behavior of it.

In the case of the molecule presented, which is an amino acid, two functional groups can be identified:

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Answer:

Invasive species are living things not naturally found in that ecosystem. They upset the natural balance.

Explanation:

The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.

The heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:

q = m x Hv

where:

First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:

moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol

Thus:

q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ

In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.

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Answer:

C. phosphate group

Explanation:

took quiz on edg

Answer:

C

Explanation:

EDGE 2022

Answer:

B. Organ.

Explanation:

College Biology Major here.

The other compound that makes up most of the other gases in the table is water vapor.

Water vapor is not listed in the table because it is not a pollutant. However, it is a significant component of exhaust gas, and it can contribute to smog formation. Water vapor is formed when the fuel in a petrol engine is burned. The combustion process produces water as a byproduct.

The amount of water vapor in the exhaust gas depends on the temperature of the combustion process. At higher temperatures, more water vapor is produced. Water vapor is not a pollutant in itself, but it can contribute to smog formation.

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Complete question:

this table shows the percentages of some gases in the exhaust from a petrol engine

nitrogen 68

carbon dioxide 15

carbon monoxide 1

oxygen 0.75

nitrogen oxides 0.24

hydrocarbons 0.005

sulphur dioxide 0.005

other gases

what is the name of the other compound that makes up most of the other gases in the table?

Cation

Type 1

Type 2

Anion

The Roman numeral represents  charge and the oxidation state of the transition metal ion.

One of the example is, iron that forms two ions, Fe2+ and Fe3+. To differentiate, Fe2+ is named iron (II) and Fe3+ is named iron (III).

Those compounds in which the cation has only one charge are Type 1 binary ionic compounds whereas compounds in which the cation can have multiple forms are Type 2 binary ionic compounds.

Type II Binary Ionic Compounds contain Transition metals with non-metal ions.

A monatomic cation derives its name from the name of the element. For example, Na+ is called sodium  whereas monatomic anion is named by taking the root of the element and then adding -ide.

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smoke

Explanation:

carbon dioxide is introduced into the atmosphere by burning of fossil fuels and forests

The formula for the hydrate is BaCl₂ × ₀.₀₈₂H₂O, and the name of the hydrate is Barium Chloride Monohydrate.

Calculating the value of "x" in the combination BaCl₂ × ₓH₂O will help us discover the hydrate's formula and name. The mass of water that was contained in the hydrate is represented by the difference between the mass before and after heating.

Mass of hydrated barium chloride (BaCl₂ × ₓH₂O) = 10.05 g

Mass of anhydrous barium chloride (BaCl₂) = 8.57 g

To find the mass of water lost:

Mass of water lost = Mass of hydrated barium chloride - Mass of anhydrous barium chloride

= 10.05 g - 8.57 g

= 1.48 g

Thus, the molar mass of water (H₂O) is 18.015 g/mol, calculate the number of moles of water lost:

Moles of water lost = Mass of water lost ÷ Molar mass of water

= 1.48 g ÷ 18.015 g/mol

= 0.082 moles

Now compare the moles of water lost to the moles of anhydrous barium chloride that are still present, in order to calculate the value of "x" in the hydrate formula BaCl₂ × ₓH₂O.

One mole of hydrated barium chloride loses "x" moles of water to produce one mole of anhydrous barium chloride, as shown by the chemical equation.

Moles of anhydrous barium chloride = 1 mole

The ratio of moles of water get reduced to moles of anhydrous barium chloride is 1:x, we can set up the following equation:

0.082 moles (water) ÷ 1 mole (anhydrous barium chloride) = 1:x

To solve for x:

x = 0.082

Thus, the formula for the hydrate is BaCl₂ × ₀.₀₈₂H₂O. Hence, name the hydrate, we use the prefix "mono" for the subscript 0.082. The name of the hydrate is Barium Chloride Monohydrate.

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Phosphatidylserine is a type of phospholipid that is mainly found in cell membranes. Its structure is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule.

The fatty acid chains are hydrophobic, meaning they repel water, while the phosphate group and serine molecule are hydrophilic, meaning they attract water.

The glycerol molecule acts as a bridge that connects the two fatty acid chains to the phosphate group and serine molecule.
The structure of phosphatidylserine is important for its function in the cell membrane.

Because of the hydrophobic and hydrophilic components of its structure, phosphatidylserine is able to form a lipid bilayer, which is a barrier that separates the inside of the cell from the outside environment.

The hydrophilic heads of the phosphatidylserine molecules face outward and interact with water, while the hydrophobic tails face inward and repel water.
Phosphatidylserine also plays a role in cell signaling and apoptosis, which is programmed cell death.

It acts as a signaling molecule by binding to proteins that are involved in cellular pathways.

In addition, phosphatidylserine is translocated to the outer leaflet of the cell membrane during apoptosis, which signals to immune cells that the cell is ready to be removed.
In conclusion, the structure of phosphatidylserine is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule. Its hydrophobic and hydrophilic components allow it to form a lipid bilayer in cell membranes, and it also plays a role in cell signaling and apoptosis.

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Answer:

b

Explanation:

Answer:

In a solution containing ammonia solution and ammonium chloride, ammonia hydrolyses in water to produce hydroxyl ions.

NH3 +H2O → NH4+ + OH-

Ammonium chloride ionises in the solution to produce ammonium ions and chloride ions where the ammonium ions undergo hydrolysis to produce more ammonia solution.

\(NH _{4} Cl→NH _{4} {}^{ + } + Cl {}^{ - } \)

The pH of an aqueous solution is defined as the negative of the logarithm of the concentration of H ion in the solution is 0.7 .

What is meant by logarithm ?

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Answer:

0.551 moles

Explanation:

To calculate the number of moles in 22 grams of argon, divide the mass by the molar mass:

Number of moles = Mass / Molar mass

Number of moles = 22 g / 39.95 g/mol

Number of moles ≈ 0.551 moles

Therefore, there are approximately 0.551 moles of argon in 22 grams of argon.

Similar, much older remnants of flooded forests have been discovered in Cascadia by earth scientists. On the coasts of British Columbia, Washington, Oregon, and northern California, they were found near bays and river mouths. Researchers discovered additional proof of powerful earthquakes in the same regions.

In 1997, scientists used dendrochronology — a method of dating trees by comparing ring patterns to samples of known age — on the ghost forest trees.1997 by scientists.

Because of the thinned coast, tides were able to drown coastal forests. Today's ghostly tree trunks serve as physical evidence of the devastating earthquakes. In Cascadia, similar, much older remnants of inundated forests have been discovered by earth scientists.

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Answer: 3. Molecules that are improperly oriented during collision will not react.

Explanation:

According to the collision theory , the number of collisions that take place per unit volume of the reaction mixture is called collision frequency. The effective collisions are ones which result into the formation of products.

It depends on two factors:-

1. Energy factor:  For collision to be effective,  the colliding molecules must have energy more than a particular value called as threshold energy.

2. Orientation factor: Also the colliding molecules must have proper orientation at the time of collision to result into formation of products.

Thus not all collisions between reactant molecules lead to reaction because molecules that are improperly oriented during collision will not react.

Answer:

C). The structures in the cell work together to perform its life functions.

Explanation:

Unicellular organisms are characterized as organisms that are able to perform all the life functions through a single-cell. The third statement correctly elaborates how 'single-celled organisms carry out these life functions by cooperatively employing the structures lying inside the cell.' The first option is incorrect as it talks about multi-cells which doesn't even exist in unicellular organisms. While the second option is wrong because there are no tissues formed of single-cell. The last option is incorrect as the specialized cells perform different life functions in multi-cellular organisms. Thus, option C is the correct answer.

Answer:

The structures in the cell work together to perform its lifefunctions.

Explanation:

Answer:

The correct answer is a

Explanation:

The formula for density is mass ÷ volume. Hence, a balance is required to determine the mass while a measuring/graduated cylinder is required to determine the volume.

The ideal measuring cylinder and balance to be used should have an uncertainty of just 0.1 ml and 0.1 g respectively. This reduces the chances of the answer gotten from the formula above to be more than 3 significant figures.

For example, if the volume to be used is 4.0 ml and the mass of this volume is 3.5 g, the density will be

Density = 3.5 ÷ 4

Density = 0.875 g/cm³ or 0.875 g/ml

NOTE that cm³ is the same measurement as mL

The answer above is in 3 significant figures

When fossil fuels burn, several forms of energy are produced, including:

Heat energy: The primary form of energy released during fossil fuel combustion is heat. Fossil fuels contain chemical energy stored for millions of years, and when they burn, this energy is released in the form of heat. The heat energy can be harnessed for various purposes, such as heating buildings or generating steam to drive turbines.

Light energy: Burning fossil fuels can also produce light energy in the form of flames or glowing embers. This light energy is a byproduct of combustion.

Mechanical energy: Heat generated by burning fossil fuels can be converted into mechanical energy. This is typically achieved by using heat to produce steam, which drives a turbine connected to a generator. The rotating turbine converts the heat energy into mechanical energy, which is further transformed into electrical energy.

Electrical energy: Through the process described above, burning fossil fuels can ultimately generate electrical energy. The mechanical energy produced by the turbine is converted into electrical energy by the generator. Electrical energy can power various devices, appliances, industries, and infrastructure.

It's critical to note that while burning fossil fuels can produce useful forms of energy, it also results in the release of carbon dioxide and other greenhouse gases. This contributes to climate change and environmental concerns. As a result, there is a global shift towards cleaner and renewable energy sources to mitigate these negative impacts.

Structural isomers are molecules with the same molecular formula but with different structural formulae. This means that they have the same number and types of atoms, but they are arranged differently. The following two organic compounds are structural isomers of each other.

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Answer:

Boiling

Explanation:

When a liquid is heated, the vapor pressure rises steadily. When water attains a temperature of 100°C or 212°F its vapor pressure is now equal to the atmospheric pressure at sea level, this is what we mean by boiling.

When this occurs, water continues to evaporate untill the vapor pressure inside the bubbles becomes high enough to stop water bubbles from collapsing again from the pressure of the water around it so the bubbles rise and break the surface.

Reactions in our natural world range from classical chemical reactions to nuclear reactions.

A classical chemical reaction is a natural process that occur when one or more elements called reactants change to form one or more products.

Chemical reactions can be speed up by the action of enzymes, which are biological catalysts capable of lowering the activation energy of the reactions.

On the other hand, nuclear reactions occur when atoms react among them to generate new elements.

Nuclear reactions can be classified into fusion reactions where atomic nuclei fuse and fusion reactions where an atomic nucleus gives rise to two different atoms.

In conclusion, Reactions in our natural world range from classical chemical reactions to nuclear reactions.

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The density of 200 cm^3 of pure water is 200 g / 200 cm^3 = 1 g/cm^3, and  is the same as the density of 1 cm^3 of water.

b. A Corn syrup on top, water in middle, and olive oil on bottom because corn syrup has the highest density of 1.4 g/cm^3, followed by water with a density of 1 g/cm^3, and olive oil with a density of 0.85 g/cm^3.

So option A is correct.

Density is described as the substance's mass per unit of volume.

We were able to determine which substance will stay in its relative position using Archimedes' principle which states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces.

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Explanation:

Examples of chemical changes include, rusting, fire, and overcooking. Nuclear changes occur when the nuclei of atoms are rearranged to form new atoms. Examples of nuclear changes include atomic fission, nuclear fusion, and the energy of sun and stars.

Explanation:

decrease T = eq shifts left, because youre taking energy from the system and this is an endothermic reaction, it needs energy to make products = co2 concentration decreases

add CO = eq shifts right, because you're adding reactants in the equilibrium = i2o5 concentration decreases

increase i2o5 = same = can't affect T

decrease co2 = eq shifts right, because by

decreasing co2 you'll have less of this product than you normally have in the equilibrium, then eq will shift toward making more product = both reactants, CO and I2O5 decrease their concentration because they're being used to shift equilibrium right

Answer:

salt increases the boiling temperature, but not by very much.

I hope this helps you and it is the right answer

Substance A has a higher boiling point compared to Substance B when measured on the same temperature scale.

To compare the boiling points of Substance A and Substance B, which were measured using different temperature scales, we need to convert the temperatures to a single scale for accurate comparison. The boiling point of Substance A was reported as 245 K, and the boiling point of Substance B was reported as -92°C. To convert Substance B's temperature from Celsius to Kelvin, we need to add 273.15 to the Celsius value. Thus, -92°C + 273.15 = 181.15 K. Now, both temperatures are in Kelvin: Substance A boils at 245 K, and Substance B boils at 181.15 K. Comparing the temperatures, we find that Substance A boils at a higher temperature (245 K) than Substance B (181.15 K). Therefore, Substance A has a higher boiling point compared to Substance B when measured on the same temperature scale.

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The equilibrium constant for the reaction at 655 K is \(e^{6.96}\) ≈ 1.05 × 10^3.

The equilibrium constant (K) for a reaction is related to the change in Gibbs free energy (ΔG) through the equation:

ΔG = -RTlnK

where R is the gas constant, T is the temperature in kelvin, and ln is the natural logarithm. Since ΔG and ΔH (the change in enthalpy) are related by the equation:

ΔG = ΔH - TΔS

where ΔS is the change in entropy, we can rearrange the first equation to get:

lnK = -ΔH ÷ RT + ΔS ÷ R

At 298 K, we can use the given values of ΔH and K to solve for ΔS:

lnK = -ΔH ÷ RT + ΔS ÷ R

ln(1.4 × 10³) = (-(-25.8 × 10³ J/mol) ÷ (8.314 J/mol K × 298 K)) + ΔS ÷ 8.314 J/mol K

ΔS = 78.2 J/mol K

Now we can use the equation above to solve for lnK at 655 K, using the same value of ΔH and the newly calculated value of ΔS:

lnK = -ΔH ÷ RT + ΔS ÷ R

lnK = -(-25.8 × 10³ J/mol) ÷ (8.314 J/mol K × 655 K) + (78.2 J/mol K) ÷ 8.314 J/mol K

lnK = 6.96

e ≈ 1.05 × 10³

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