Which sentence most accurately describes the daily growth rate of plants? (1 point)

If a  sample of metal has a mass of 2272 grams. Its dimensions are 5 cm by 5 cm by 8 cm, then the density of the sample of the metal would be 11.36 grams / centimeter³.

It can be defined as the mass of any object or body per unit volume of the particular object or body.

ρ = mass / volume

As given in the problem sample of metal has a mass of 2272 grams. Its dimensions are 5 cm by 5 cm by 8 cm.

The density of the metal  = 2272 / (5 × 5× 8)

                                         = 11.36 gram / cm³

Thus, the density of the metal would be 11.36 grams / cm³.

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Factors influence bond lengths are smaller atoms have shorter bond lengths. double bonds are shorter and stronger than single bonds.

Bond order, or the number of chemical bonds between a pair of atoms, is a measure of a bond's stability. For instance, the bond order in diatomic nitrogen, NN, is 3, while in acetylene, HCCH, the carbon-carbon bond order is also 3, while the CH bond order is 1. Bond type and bond strength are determined by bond order and length between atoms. The relationship between bond order and length is inverse: as bond order rises, bond length falls.

When two atoms come together to form a molecule, their electrons join forces by fusing into gaps in one another's orbital shells.

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The isotopes of the element X are; 19/9X, 20/9X and 21/9X.

The term isotopes has to do with the atoms that have the same atomic number but they do not have or posses the same mass number. The implication of this definition is that the atoms that we call the isotopes are different in the number of the neutrons that they do contain.

Now we know that the common thread that holds the atoms that we call an isotope of each other is that they have the same atomic umber and the atomic number of the atom X in this case is 9.

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The trend which depicts the reactivity of most nonmetals show in a periodic table is that it  increases from left to right across the periodic table and is denoted as option C.

This is referred to as the tabular arrangement of elements into groups and periods which is according to their similar features such as reactivity, number of electron shells etc.

When considering the periodic table, the reactivity of most nonmetals such as oxygen decreases top down within groups and increases from left to right across period which is therefore the reason why it was chosen as the most correct choice.

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Answer:

B

Explanation:

c isnt right

The following which are medical applications of radiation include the following below:

This is referred to as the transmission of energy through space and it usually occurs at the speed of light thereby making it a very fast method of heat transfer when compared to the others. Radiation are used for various purposes such as immigration for searching luggage etc.

It is also used for medical reasons such as cancer therapy as the radiation help in destroying the cancerous cells thereby making it easy for their removal from the body system. It is also used for genetic engineering in the creation of new types of substances through the modification of nucleic acids such as DNA etc.

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The kilojoules of heat released per gram of the compound reacted with oxygen is -72.052 kj/g

The standard enthalpy of formation is a measure of the strength launched or fed on while one mole of a substance is created under trendy situations from its natural elements. The symbol of the standard enthalpy of formation is ΔH f. = A degree means that it's a fashionable enthalpy change.

Enthalpy of a formation refers to the trade in enthalpy for the formation of one mole of a substance from the maximum solid form of its constituent factors. change in enthalpy is symbolized by means of delta H and the f stands for formation.

Given,

compound             ΔH°f

B₅H₉                       73.2

B₂O₃                       -1271.94

H₂O                        -285.83

Balanced chemical equation:-

2B₅H₉  (l)  +  12O₂ +(g) => 5B₂O₃  + 9H₂O(l)

From Hess's law

ΔH°min = Σ enthalpies of products - Σ enthalpies of reactants

             = 5× (-1271.94) + 9×( -285.83) - 2(73.2) kj/mol

ΔH°min = -9078.59 kj/mol

It is seen that 2 moles of B₅H₉    react with O₂ is  -9078.59 kj/mol

For 1 mole = -9078.59 kj/mol/2

                 = 4539.295 KJ/mol

The energy released per gram = energy released per mol/molar mass of B₅H₉

                                            = 4539.295 kj/mol/63 g/mol

energy released per gram = -72.052 kj/g

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Potassium have three isotopes.

254 stable isotopes are known.  Certain substances can only exist in unstable states (for example, uranium).

The stable potassium isotope has a nuclear spin of 3/2, a relative atomic mass of 38.963707, and a natural abundance of 93.3 atoms.

We must compute for the various atomic weights of the isotopes since potassium has three distinct isotopes: Potassium-39 has an atomic mass of 39 and 19 protons. Therefore, the number of neutrons is 39 – 19, or 20.

If potassium has an atomic mass of 39.0983, the average is obviously highly biassed in favour of potassium-39, making potassium-39 the isotope with the greatest abundance.

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Avogadro's Number:

Avogadro's number, which is equal to 6.02214076 x [tex]10^{23}[/tex], is the quantity of units in one mole of any material. Hence, 1 mole of HBrO3 will contain

6.02214076 x [tex]10^{23}[/tex] atoms.

Then, 0.009567 mole of HBrO3 will contain

= 0.009567 moles x 6.02214076 x [tex]10^{23}[/tex] atoms

=  0.0576138 x    [tex]10^{23}[/tex]  atoms = 5.761 x [tex]10^{21}[/tex] atoms.

Hence, 0.009567 mole of HBrO3 will contain 5.761 x [tex]10^{21}[/tex] atoms.

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In this question, we need to determine what will be the nuclear equation for the Beta decay of Lead - 210.

Beta decay is a type of radioactive decay in which we will have either a neutron becoming a proton, this will be called Beta-minus decay or a proton becoming a neutron, this will be called a Beta-plus decay

In the case of Pb-210, we will have a Beta-minus decay, and one neutron will become a proton:

210/82 Pb ---> 210/83 Bi + electron

Lead - 210 will become Bismuth - 210

The pH of the solution after 28.0 ml of NaOH have been added to the acid exists 0.85.

The balanced reaction between base and acid exists;

NaOH + HCl → NaCl + H₂O

NaOH exists a strong base and HCl exists a strong acid therefore complete dissociation. Stoichiometry of acid to base exists 1: 1.

The number of moles of base added - 0.5 M /1000 mL/L × 28.0 mL = 0.014 mol

the number of acid moles present - 0.5 M /1000 mL/L × 50.0 mL = 0.025 mol.

acid reacts with base 1: 1 ratio

Therefore excess amount of acid present - 0.025 - 0.014 = 0.011 mol

Total volume = 50.0 + 28.0 = 78.0 mL

[H⁺] = 0.011 mol/0.078 L = 0.14 M

Therefore, pH = -log [H⁺]

substitute the values in the above equation, we get

pH = -log(0.14)

simplifying the above equation, we get

pH = 0.85.

Therefore, the pH of the solution after 28.0 ml of NaOH have been added to the acid exists 0.85.

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Answer:

I don't know why 27.6 g is not the correct answer.  I believe that it is correct.

27.6 grams of [tex]H_{2}[/tex].

Explanation:

The balanced equation tells us that 17 moles of hydrogen will react completely with 8 moles of carbon monoxide.  That is a molar ratio of 17/8 moles H2/molesCO.

If we start with 6.5 moles of CO, we need:

(6.5 moles CO)*(17/8 moles H2/moles CO) = 13.8 moles of H2 (3 sig figs)

Convert 13.8 moles of H2 into grams H2 by multiplying by the molar mass iof H2 (2g/mole):

(13.8 moles H2)*(2 g H2/mole H2) = 27.6 grams of [tex]H_{2}[/tex].

The mass of each salt which will be added to the mixture is:

NaH₂PO₄ =  1.876 g

Na₂HPO₄ =  4.879 g

To make this buffer, phosphoric acid and/or its salts can also be combined in the following ways:

H₃PO₄ and Na₂HPO₄;

H₃PO₄ and Na₃HPO₄

The acid must be in the second ionisation if we are to have a buffer at 7.540, thus we would pick pKa2 = 7.198 for the buffer capacity.

7.540 = 7.198 + log[A⁻]/[HA]

log[A⁻]/[HA] = 0.342

[A⁻]/[HA] =

[A⁻]/[HA] = 2.198

[A⁻] = 2.198*[HA]

The concentration of the acid is conjugated to base and must be equal to the concentration of the buffer 0.0500 M, so:

[A⁻] + [HA] = 0.0500

2.198*[HA] + [HA] = 0.0500

3.198*[HA] = 0.0500

[HA] = 0.01563 M

[A⁻] = 0.0500 - 0.01563

[A⁻] = 0.03436 M

The mixed reaction is: NaH₂PO₄ + Na₂HPO₄ → HPO₄⁻² + 3Na + H₂PO₄⁻

The second ionization is:

H₂PO₄⁻ ⇄ HPO₄⁻² + H⁺

Because H₂PO₄⁻ is the acid form, its concentration is the same as NaH₂PO₄, and HPO₄⁻² is the conjugated base, and its concentration is the same as Na₂HPO₄ (stoichiometry is 1:1 for both).

If you want to prepare something for buffering, you must first have a solution of the species H2PO4 and HPO42, so that you can mix the mixture of:

H3PO4 and Na2HPO4 (the acid is tricrotic, forming H2PO4 as a result),

The dissociation of the salt Na2HPO4 into Na+ and HPO42);

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Answer: This may seem unlikely for whereever you're living but say if a drought happened in your country and water is very limited, then we'd have to import water from other countries but if their water is unclean then we also have a problem of no water. Most bottled water sold in stores comes from other countries aswell.

From the slope of the graph, the experiment’s results lie close to the best fit line and have no noticeable outliers; it is reliable; option D

A line of best fit is a line that plots a range of data to the approximately best value.

The line of best will minimized the variation between several points in the data.

Considering the data points plotted, the slope of the whole line can be derived as:

slope = Δy / Δx

slope = (3.4 - 0.8) / (0.6 - 0.1)

slope = 5.2

Taking the slope from the intercept of the line of best fit on the y-axis

Slope = (3.4 - 0.4) / (0.6 - 0.0)

slope = 5.0

Therefore, the data is reliable.

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Sodium is highly electropositive thus it can easily give out one electron from the outermost shell of the atom of the element.

We know that sodium is an element that has been found to be a member of group one of the periodic table. This implies that the sodium has only one electron in the outermost shell of the atom. As such, the sodium atom is quite very reactive and we observe that the sodium atom does loose electron easily.

The elements that are in the first group of the periodic table are highly electropositive and  this is what informs the fact they have a tendency to loose electrons quickly.

When the sodium atom looses an electron, it forms a univalent positive ion and there is a loss of an entire shell and this is why we find out that sodium does not occur in a free sate in nature owing to the fact that it tends to react very much.

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Using the molarity of the final solution and the molar mass of silver nitrate, we can calculate that the student used 8.0015 g of silver nitrate to make the stock solution.

First, we calculate the number of moles in the 500.00 mL flask using the molarity (c) of the final solution and its volume (V = 500.00 mL = 0.50000 L).

c = n/V ⇒ n = c*V

n = 9.443 * 10⁻³ M * 0.50000 L

n = 4.7215 * 10⁻³ mol

This same number of moles was in the 25.059 mL solution that was subsequently diluted to 500.00 mL. Knowing this, we can make a simple proportion to calculate the number of moles present in the original 250.00 mL:

4.7215 * 10⁻³ mol : 25.059 mL = X : 250.00 mL

X = 4.7215 * 10⁻³ mol * 250.00 mL / 25.059 mL

X = 0.047104 mol

That's the amount (n) of silver nitrate used to make the stock solution. Now we can convert it to mass (m) by using the molar mass of silver nitrate (M = 169.87 g/mol):

n = m/M ⇒ m = n*M

m = 0.047104 mol * 169.87 g/mol

m = 8.0015 g

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The rate of a reaction indicates how fast the products are formed or how fast the reactants are consumed. Option A.

The reaction rate or rate of reaction is the rate at which a chemical reaction occurs and is defined as proportional to the increase in the concentration of products per unit of time and the decrease in the concentration of reactants per unit of time. Reaction rates vary greatly. The reaction rate is the rate at which a reaction reaches equilibrium.

In enzyme-catalyzed reactions, the rate is usually expressed as the amount of product produced per minute. The reaction rate is determined by the energy barrier between the reaction and the products. Reaction rate indicates the speed of reaction. That is how quickly reactants are consumed, how quickly products are formed, or how quickly energy is absorbed or released. Reaction speed is a powerful diagnostic tool. By understanding the speed at which products are made and the causes of slow reactions.

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The conversion of solar energy into the chemical energy of a carbohydrate occurs during the process of photosynthesis.

Certain organisms convert solar energy (sunlight) into chemical energy through photosynthesis, which is then used to construct carbohydrate molecules. When an organism breaks down food, the energy that was used to keep these molecules together is released.

The energy generated by photosynthesis continuously enters the planet's ecosystems and is transferred from one organism to another. As a result, the majority of the energy that all living things on Earth require comes from the process of photosynthesis, either directly or indirectly.

Oxygen is also released into the atmosphere as a result of photosynthesis. To summarize, humans rely almost entirely on photosynthesis-producing organisms for food and oxygen.

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A good test for calcite is the test using acid and a rock formation that contains calcite is limestone.

We know that rock has to do with a solid mass that contains minerals. We know that many rocks are composed of various kinds of minerals that could be found inside the rocks. One of the minerals that could be found in rock is calcite which is composed of calcium carbonate. The presence of calcite can be tested by that addition of an acid which leads to the effervescence of a colorless odorless gas.

The rock formations that contain calcite are mainly limestone and and are known for their grey or white color.

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Answer:

Cutting hair is a physical change since it doesn't change the substance its still hair

bending a paper clips since it's also the same substance

Ice cube melting

Explanation:

All of these are physical change since there reversible and they all still stay the same substance

Answer:

the answer is C.Distilled or deionized water.

The reason for the standardization of sodium hydroxide is that the compound is deliquescent.

The term standardization has to do with the process by which the concentration of the sodium hydroxide is determined. We know that there are some compounds that we do not need to standardize before they are used. The solid is just dissolved and made up to mark and then the solution thus prepared could be used in the standardization of other solutions.

However, this is not the case for sodium hydroxide because the compound in itself is deliquescent. This means that the solid is able to absorb moisture hence we can not get the actual amount of the sodium hydroxide by merely weighing the solid.

As such, we can be able to obtain the concentration of the sodium hydroxide by standardizing it using a primary standard.

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Answer:

A -carbon and lithium.

Explanation:

Carbon and lithium are two elements form acidic oxides.

One or more oxygen atoms are joined with another element to form a chemical molecule known as an oxide (for instance, Li2O).

The term "oxide" refers to a binary compound containing oxygen and another element, such as CO2, SO2, CaO, CO, ZnO, BaO2, and water. Because oxygen is combined with just one other element in these substances, they are referred to as oxides. Oxides are divided into acidic, basic, amphoteric, and neutral categories based on their acid-base properties:

An oxide is referred to as acidic if it reacts with water to form an acid. A basic oxide is an oxide that produces a base in water. A substance that can chemically react as either an acid or a base is called an amphoteric solution.

Therefore, Carbon and lithium are two elements form acidic oxides.

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The work done by the gas that expands at constant external pressure ( isobaric expansion) is 174.8 J

The work done by the gas that expands at constant external pressure is work done under isobaric conditions.

The work done by an isobaric expansion is calculated with the formula below:

Work done = P (Vf − Vi)

where;

P = 1.15 atm

P is converted to N/m² and volume is converted to m³

1.15 atm = 1.15 * 101325 N/m²

P = 116523.75 N/m²

Vf = 1.65 * 10⁻³ m³

Vi = 0.15 * 10⁻³ m³

W = 116523.75 N/m² ( 1.65 * 10⁻³ m³ - 0.15 * 10⁻³ m³)

Work done = 174.8 J

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The number of moles of potassium hydroxide that would react with 1 mole of hydrochloric acid would be 1 mole.

Stoichiometric mole ratio

The stoichiometric moles of species of a reaction are the coefficients of each species in the balanced symbol equation of the reaction.

The balanced equation of the reaction between potassium hydroxide (KOH) and hydrochloric acid (HCl) is expressed as follows:

[tex]KOH + HCl --- > KCl + H_2O[/tex]

In this case, the stoichiometric mole of KOH is 1, that of HCl is 1, that of KCl is 1, and that of [tex]H_2O[/tex] is also 1.

In other words, the stoichiometric mole ratio of KOH and HCl is 1:1. For every 1 mole of KOH, 1 mole of HCl is required for a complete reaction.

Now, the question says what mole of potassium hydroxide will be required to react with 1 mole of hydrochloric acid?

Following the mole ratio, 1 mole of KOH will also be required.

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Explanation:

A. Even though CH3F has a tetrahedral geometry, the molecule is not symmetric due to the presence of the fluorine atom in the structure resulting in the molecule being polar.

B. None of the above gives a valid explanation.

C. Even though CH3F has a tetrahedral geometry, the carbon atom in the molecule, being the central atom, is more electronegative than the hydrogen and fluorine atoms in the molecule resulting in the molecule being polar.

D. Even though CH3F has a tetrahedral geometry, the fluorine atom in the molecule, being the central atom, is more electronegative than the hydrogen and carbon atoms in the molecule resulting in the molecule being polar.

E. Even though CH3F has a tetrahedral geometry, the hydrogen atoms in the molecule are more electronegative than the fluorine resulting in the molecule being polar.

Answer

B. 11.2 grams

Explanation:

Molar mass of CaCl = 110.98 g/mol

Molar mass of KCl = 74.5513 g/mol

From the balanced chemical equation of the reaction given;

1 mole CaCl produced 2 moles KCl.

In grams;

(1 mol x 110.98 g/mol) CaCl produce (2 mol x 74.5513 g/mol) KCl, i.e

110.98 g CaCl produced 149.10236 g KCl,

Therefore, the grams of CaCl needed to produce 15.0 g KCl will be:

Therefore, 11.2 grams of calcium chloride are needed to produce 15.0 g of potassium chloride.

The concentration of so2 emitted on a hg/m3 basis is 0.01 M.

Concentration is the abundance of a constituent divided through the full extent of an aggregate. several styles of mathematical description can be distinguished: mass attention, molar awareness, range attention, and quantity attention.

Given the 5 ppmv SO2 and we need to calculate the concentration of SO2 emitted on a µg /m3 basis.

We know,

mg/m3 = ppmv * M/0.08205*T

M = molecular weight of gas = 64.064 g/mol

mg/m3 = 5 ppmv *64.064 g.mol-1/ 0.08205 * 273.15 K

  = 14.28 mg/m3

Now we know

1 mg = 1000 µg

So, 14.258 mg =?

= 14280 µg/m3

We are given partial pressure. P = 0.1 atm.

Henry’s law constant =  0.1 mole/(liter.atm)

C = Kh*P

 = 0.10 mol/L.atm * 0.10 atm

  = 0.01 mol/L

    = 0.01 M

So, the equilibrium concentration of a gas in water is 0.01 M.

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There are two chiral centers in the ethambutol molecule, but only three possible stereoisomers (structures attached below).

In general, the number of stereoisomers of a chiral molecule is 2ⁿ, where n is the number of chiral centers, so for ethambutol it should be 2² = 4. However, if the molecule is symmetrical (in this case it has a plane of symmetry), then there is an R,S-isomer that is not optically active as a whole because the chiral centers cancel each other out. This is a so-called meso-isomer. So, in the end, we have two enantiomers (R,R- and S,S-) and a meso-isomer, giving us three stereoisomers in total.

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