Chemistry assessment

The plants which have a fibrous root system are

A fibrous root system is a root system which consists of large mass of roots of nearly equal size

Some few examples of plants with fibrous roots system are as follows:

In conclusion; the plants which have a fibrous root system are grasses and corns.

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Answer:

Mechanical energy is basically the energy of movement

For example, if I am running, im using Mechanical energy

Answer:

Explanation:

The double replacement reactions among the given options are:

C. KCl + AgNO3 → AgCl + KNO3

D. Cu + Ag(NO3)₂ → Ag + Cu(NO3)₂

These reactions involve an exchange of ions between two compounds, resulting in the formation of new compounds. In a double replacement reaction, the positive ions in the reactants switch places to form new compounds.

Therefore, options C and D are the double replacement reactions.

Answer:

12 tablespoons

Explanation:

because 3/4 of 16 tablespoons is 12 tablespoons

16x 0.75 =12

The total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

Option (C) is correct.

To calculate the number of half-lives required for the decay. The half-life of 140 Ba is given as 283.2 hours.

First, we calculate the fraction of the original amount remaining after each half-life. Since the half-life represents the time it takes for half of the substance to decay, the fraction remaining after each half-life is 1/2.

To find the number of half-lives required to decay from 35 mg to 1.0 mg, we can set up the following equation:

(35 mg) * (1/2)ⁿ = 1.0 mg

Where 'n' is the number of half-lives.

Now, let's solve for 'n':

(1/2)ⁿ = 1.0 mg / 35 mg

(1/2)ⁿ = 0.02857

To find 'n', we can take the logarithm (base 1/2) of both sides:

n = log base 1/2 (0.02857)

Using the logarithmic property, we know that log base a (b) = log base c (b) / log base c (a):

n = log (0.02857) / log (1/2)

Using a calculator, we can find:

n ≈ 4.243

Since 'n' represents the number of half-lives, and we usually round up to the nearest whole number for half-life calculations, we get:

n ≈ 5

Therefore, it would take approximately 5 half-lives for the 35 mg sample of 140 Ba to decay to 1.0 mg.

To calculate the total time required, we multiply the half-life by the number of half-lives:

Total time = 283.2 hours * 5

Total time ≈ 1416 hours

Rounding to one decimal place, the total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

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Answer:

1.5 moles

Explanation:

O   mole weight = 15.999

O2 mole weight = 2 * 15.999 = 31.998 gm

48 / 31. 998  = ~ 1.5 moles

Answer:  6.02x10^22 atoms

Explanation:  1.4 grams is (1.4g/28 g/mole) = 0.05 moles of N2.

(0.05 moles)*(6.02x10^23 molecules/mole) = 3.01x10^22 molecules

(3.01x10^22 molecules)(2 atoms/molecule) = 6.02x10^22 atoms

n SnCl₄ = m SnCl₄ / Mr SnCl₄

n SnCl₄ = 54.3 / 260.5

n SnCl₄ = 0.208 mol

n Na = V / 22.4 (at STP)

n Na = 23 / 22.4

n Na = 1.027 mol

Mole of Sn produced :

n Sn = (1/1) • 0.208

n Sn = 0.208 mol

m Sn = n Sn • Mr Sn

m Sn = 0.208 • 118.7

m Sn = 24.69 gr

Answer:

The Size of the Planet is little related to the thickness of the atmosphere because larger sized planets are able to hold more lighter gas because they have higher gravity influence due to larger planet. This inner planets have smaller atmosphere compared to the outer planets.

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Metals on reaction with acids liberate Hydrogen gas. This is the reason why bubbles are formed in the solution.

When the metals reacts with acids the mass of the metal will decreases with the liberation of hydrogen gas . This can acts as a exception for law of conservation of mass.

The law of conservation of mass determines  that in a chemical reaction mass can  neither  be created nor destroyed. For instance , the carbon atom in coal as carbon dioxide when it is burned. The carbon atom transforms  from a solid structure to a gas but its mass doesn't  changes.

The principle states  that the mass of matter, in a closed system, will always be the same no matter what type of change  can happens to the matter. Whether it's a change in state, or dissolving, or a chemical reaction, or any combination , the amount of mass will not be   change.

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Answer:

C. sorry i am late :)

Explanation:

During photosynthesis, plants intake carbon dioxide from the air and releases oxygen. Thus, they are providing enough oxygen available for humans to breath.

Photosynthesis is a bio-chemical process by which green plants produces chemical energy with the aid of light energy absorbed by chlorophyll. Photosynthetic reaction is the combination of carbon dioxide and water giving molecular oxygen and glucose.

Through photosynthesis, the amount ox oxygen and carbon dioxide in the atmosphere is balanced. This balancing cycle involves respiration of animals also.

The carbon dioxide that we exhale are up taken by plants and converts to oxygen gas. This makes sufficient oxygen for all animals to breath. Therefore, photosynthesis is a stage in carbon cycle and oxygen cycle.

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Answer:

cold and windy

Explanation:

if its 10 degrees outside then it must be cold. then 75 mph that is very windy

The theoretical yield of hydrobenzoin that can be obtained from the reduction of benzil is 0.51 g. The moles of benzil used are 0.0030 mol, while the moles of sodium borohydride used are 0.0014 mol. Based on the stoichiometry of the reaction, benzil is the limiting reagent.

To calculate the theoretical yield of hydrobenzoin, we first need to determine the limiting reagent. The balanced chemical equation for the reduction of benzil to hydrobenzoin using sodium borohydride is:

C₁₄H₁₀O₂ + 2 NaBH₄ + 2 H₂O → C₁₄H₁₂O₂ + 2 NaBO₂ + 4 H₂

From the given information, we have 0.5 g of benzil, which can be converted to moles using its molar mass. The molar mass of benzil is 210.23 g/mol, so the moles of benzil used are:

0.5 g benzil × (1 mol benzil / 210.23 g benzil) = 0.0024 mol benzil

Next, we have 0.1 g of sodium borohydride, which can be converted to moles using its molar mass. The molar mass of sodium borohydride is 37.83 g/mol, so the moles of sodium borohydride used are:

0.1 g sodium borohydride × (1 mol sodium borohydride / 37.83 g sodium borohydride) = 0.0026 mol sodium borohydride

Comparing the moles of benzil and sodium borohydride, we see that the moles of benzil are lower. Therefore, benzil is the limiting reagent.

To calculate the theoretical yield of hydrobenzoin, we use the stoichiometry of the reaction. From the balanced equation, we see that 1 mol of benzil reacts to form 1 mol of hydrobenzoin. Therefore, the moles of hydrobenzoin formed will be equal to the moles of benzil used, which is 0.0024 mol.

Finally, we can calculate the theoretical yield of hydrobenzoin in grams using its molar mass. The molar mass of hydrobenzoin is 212.24 g/mol, so the theoretical yield is:

0.0024 mol hydrobenzoin × (212.24 g hydrobenzoin / 1 mol hydrobenzoin) = 0.51 g hydrobenzoin

Therefore, the theoretical yield of hydrobenzoin that can be obtained is 0.51 g.

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Answer:

D.protons

Explanation:

Gold is a chemical element and it is the element 79 on the periodic table. Thus, it has an atomic number of 79. The chemical symbol for Gold is Au, it is chemically classified as a transition metal and as a solid at room temperature.

Generally, the chemical element Gold is known to be malleable, ductile and a good conductor of electricity and heat. Also, it is a non-toxic chemical element with a beautiful lustrous sheen.

Gold atoms can be identified based on the number of protons (79) because it represent its atomic number, which is what is used to differentiate an atom of an element from the atom of another chemical element.

Answer:

quartz (SiO2)n

Explanation:

Melting point is defined as the temperature or point at which the substances change its state from solid to liquid.

Quartz (SiO2)n has high melting point than O2 because Quartz (SiO2)n is found in the form of hard, crystalline mineral that is made up of silicon and oxygen atoms having strong covalent bonds between all the atoms. So, a lot of energy is required to break the bond between the atoms and it has a high melting point.

Hence, the correct answer is quartz (SiO2)n.

Answer:

Amy's question is not testable and too broad.

Answer:

i. If the area is doubled keeping the force constant, then pressure will be halved.

ii. If force is doubled keeping area constant, then pressure will also be doubled.

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Molar mass

No of moles

Volume

Answer:

Mass = 0.287 g

Explanation:

Given data:

Number of moles of MgCl₂ = 0.001 mol

Mass of precipitate formed (AgCl) = ?

Solution:

Chemical equation:

MgCl₂(aq) + 2AgNO₃(aq)    →       Mg(NO₃)₂(aq) + 2AgCl (s)

now we will compare the moles of MgCl₂ and AgCl.

            MgCl₂           :            AgCl

                1                :             2

           0.001             :       2/1×0.001 = 0.002

Mass of AgCl:

Mass = number of moles × molar mass

Mass = 0.002 mol × 143.4 g/mol

Mass = 0.287 g

Answer:

The first one is Propane

The second one is HEPTANE

The third one is octane

The 4th is butane

the 5th is decane

The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.

The images has been the representation of the ball and stick structure of the compounds. The central balls have been the representation of the carbon atom , with small balls attached to the sticks have been the representation of the hydrogen attached.

The following structures has been given as:

The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.

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In this experiment, when a solid chemical is dissolved in water, the temperature of the water sample rose from 22.4°C to 27.3°C. Here are the statements that are true about this experiment:

1. The dissolution process is exothermic: This is indicated by the increase in temperature of the water sample. An exothermic reaction releases heat energy to the surroundings, resulting in a temperature rise.
2. The reaction is likely to be spontaneous: A spontaneous reaction occurs naturally without requiring external energy input. The rise in temperature suggests that the reaction occurred without any additional heat input.

3. The solid chemical has a positive enthalpy of solution: The positive temperature change indicates that heat was absorbed during the dissolution process. This suggests that the solid chemical has a positive enthalpy of solution, meaning that energy is required to break the intermolecular forces holding the solid together.
4. The reaction is likely to be exothermic and spontaneous: The combination of the temperature increase and the lack of external heat input suggests that the reaction is both exothermic and spontaneous.

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1,3,5-hexatriene contains three bonding molecular orbitals.

A conjugated hydrocarbon having a chain of six carbon atoms and three double bonds is known as 1,3,5-hexatriene.

The 1,3,5-hexatriene -system, which is made up of the overlapping p-orbitals of the carbon atoms engaged in the double bonds, must be taken into account in order to calculate the number of bonding molecular orbitals (MOs) in the compound.

A string of MOs is created when the electrons in a conjugated compound, like 1,3,5-hexatriene, are delocalized along the whole chain. There are two MOs one bonding molecular orbital and one antibonding molecular orbital for every double bond.

The compound 1,3,5-hexatriene contains three double bonds. Consequently, there will be three bonding molecular orbitals.

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Answer:

Convection

Explanation:

▶ Convection is the transfer of heat through a gas or a liquid. The gas in this case would be the air passing through the heat and moving in a large quantity that then heats the hair.

It may be all of the above since the hair dryer is using both convection and conduction produce hot air but it says clearly so im assuming its Convection.

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The name for a solute that does not exert a vapor pressure when it is dissolved in a liquid is ""nonvolatile.""

When a nonvolatile solute is dissolved in a liquid, it does not contribute to the vapor pressure of the resulting solution. This is because the nonvolatile solute does not easily evaporate into the gas phase, and therefore does not exert a vapor pressure.

Colloids are mixtures in which small particles of one substance are suspended evenly throughout another substance, but they can still exert a vapor pressure. Amorphous and crystalline solids can both exert vapor pressure when heated, but are not typically dissolved in liquids. Electrolytes are solutes that dissolve in water to produce ions, and can have a vapor pressure depending on their properties.

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Answer:

Winnowing

Explanation:

Wind blows the lighter(in terms of mass) chaff from the whole grains,which are heavier(in terms of mass)

The reaction is the example of combustion reaction.

CH₄ + 2O₂ → CO₂ + 2H₂O

Burning or combustion is a highly heated exothermic reaction. It occurs when a fuel and oxygen (an oxidant) combine, releasing gaseous byproducts that are also known as smoke. A saturated open chain hydrocarbon with carbon-carbon single bonds is referred to as an alkane.

Alkane releases a tremendous amount of heat energy when heated in the presence of enough oxygen or air to form carbon dioxide and water. If the combustion reaction takes place in insufficient oxygen produces poisonous gases carbon monoxide.

Hence, combustion is complete burning to form water and carbon dioxide.

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Answer: 272.5915639999...

Explanation: