Buck's Turf Care Company mowed 229 lawns over a 18 week period. What is the average weekly rate of mowing lawns?

Answer:

pKa = 9

Explanation:

In this case, we have to remember the meaning of "p". When we use "p" in any calculation we have to apply the minus ten based logarithm, so:

[tex]p~=~-Log[/tex]

For example, when we use the "pH" value. We have to apply the minus ten based logarithm of the concentration of the hydronium ion:

[tex]pH~=~-Log[H^+][/tex]

So, if we have wanted to calculate the pKa value. We have to apply the minus ten based logarithm of the Ka value, so:

[tex]pKa~=~-Log~Ka[/tex]

Now we can plug the value into the equation:

[tex]pKa~=~-Log~1x10^-^9[/tex]

[tex]pKa~=~9[/tex]

The pKa value is 9.

I hope it helps!

Answer:

[tex]\huge\boxed{\sf 75\ mL = 0.02\ gallons}[/tex]

Explanation:

1 mL = 0.000264 gallons

Multiplying both sides by 75

75 mL = 0.000264 * 75 gallons

Answer:

1.Growth.

2 Reproduction.

3.respond to stimuli

4.are made from more than 1 cell

5.need energy to live

hope this helped

Answer:

Energy is not created but transformed meaning the energy just transformed into a different type meaning at all points of the ramp the energy stays the same because all of its energy is just transformed into kinetic energy.

Explanation:

Answer:

1

Explanation:

1000ml=1l

? =0.0024l

0.0024/1000×1

0.0000024ml

Volume has been the amount of space covered and occupied by the substance. The volume of the substance has 0.0024 liters is equivalent to 2.4 milliliters.

Volume has been defined as the three-dimensional space that has been occupied by the substance in space. It has been measured in derived units of length like cubic meter (m³), cubic centimeter (cm³), liter (l), and milliliter (ml).

The units of the volume can be converted into various derived units by multiplication and division of the units. The small units are derived from larger ones by multiplying and larger units are converted into smaller ones by division.

Given,

Volume = 0.0024 L

Converting units as:

1 liter = 1000 mL

0.0024 L = 2.4 mL

Therefore, the volume is 2.4 milliliters.

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Answer:

Answer is in the explanation

Explanation:

All acids that dissociates completely in water are considered strong acids. In the same way, bases that dissociates completely in water are strong bases. All hydroxides made from alkali metals and heavier alkali earth metals are strong bases.

HNO3 dissociates completely in water: STRONG ACID.

HCl dissociates completely in water. STRONG ACID.

NaCl is a salt. Neither a strong acid nor a strong base.

Ca(OH)2. Heavy alkaline earth metal. STRONG BASE.

CH3COOH an acid that doesn't dissociate completely in water. Neither a strong acid nor a strong base.

CH3NH2 is a weak base that doesn't dissociate completely in water. Neither a strong acid nor a strong base.

CH3OH. Methanol is an alcohol. Neither a strong acid nor a strong base.

HF is a weak acid; doesn't dissociate completely in water. Neither a strong acid nor a strong base.

RbOH. Is an hydroxide made from alkali metal. STRONG BASE.

Answer:

A. 1.512*10^3

B. 5.29*10^-3  

C. 2.152*10^-3

Explanation:

Exponential notation is where a number is represented in the form:

x * 10^n

where x is a number between 1 and 10.

In order to represent 1512 as a number between 1 and 10, we need to divide it by a multiple of 10. In this case, dividing is by 1000 will move it 3 decimal places to the left and get us 1.512 which is perfect. Because we divided by 1000 to get there, 1.512 needs to multiply by 1000 to equal the original number 1512. Since 1000 = 10^3, 1512 in exponential form is:

1.512*10^3

Similarly for the other ones:

0.00529 we need to multiply by 1000 to get to 5.29 (between 1 and 10) so this needs to multiply by 0.001 (1/1000) to equal original number so in exponential form is:

5.29*10^-3       (10^-3 = 0.001)

Finally:

21.52*10^-4 I would recommend converting back to the original number first, which would give us:

21.52*0.0001 = 0.002152

Which we need to multiply by 1000 to get right number so in exponential form is:

2.152*10^-3

Hope this helped!

Answer:

Explanation:

CH₃COCH₂CH₂CH₂CH₃   ------- Ketone because it contains C = O group .

CH₃COH=CHCH₂CH₂CH₃ ------ Alcohol group because it contains  - OH group .

CH₃CH₂COOH  ----    Carboxylic group  because it contains - COOH group.

CH₃CH₂CH₂CHO  -------  Aldehyde group because it contains - CHO group

CH₃CH₂CH₂NH₂  ----- Amine group because it contains - NH₂ group .

The compounds can be categorized as, Carboxylic acid: [tex]\rm CH_3CH_2COOH[/tex]; Amine: [tex]\rm CH_3CH_2CH_2NH_2[/tex]; Ketone: [tex]\rm CH_3COCH_2CH_2CH_2CH_3[/tex]; Aldehyde: [tex]\rm CH_3CH_2CH_2CHO[/tex], and Alcohol: [tex]\rm CH_2COH=CHCH_2CH_2CH_3[/tex].

Organic compounds are the hydrocarbons that has been divided based on the functional groups. The compounds that fall into the following category are:

The compounds can be categorized as, Carboxylic acid: [tex]\rm CH_3CH_2COOH[/tex]; Amine: [tex]\rm CH_3CH_2CH_2NH_2[/tex]; Ketone: [tex]\rm CH_3COCH_2CH_2CH_2CH_3[/tex]; Aldehyde: [tex]\rm CH_3CH_2CH_2CHO[/tex], and Alcohol: [tex]\rm CH_2COH=CHCH_2CH_2CH_3[/tex].

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Answer:

Xenon is less reactive.

Explanation:

Xenon is a noble gas with 8 valence electrons whereas bromine is a halogen with 7 and is very reactive.

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore,  xenon (xe) is less reactive than bromine (br) as xenon has noble gas electronic configuration.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

Xenon (xe) is a 18 group element of a periodic table. The electronic configuration of these are of noble gas. Noble gases are very unreactive. These can't react at even harsh condition. Bromine belongs to group 17 of parodic table that is to halogen family. Halogens have high electronegativity. these are very reactive. the ere one electron less than the noble gas electronic configuration.

Therefore,  xenon (xe) is less reactive than bromine (br) as xenon has noble gas electronic configuration.

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Answer:

6733.5 g of NaCl

Explanation:

We can assume that the salt solution is a saline solution which contains NaCl in water at 0.90%, whose density is 1.005 g/ml.

So we need to apply the density concept to solve the question.

Density = mass / volume

We convert dL to mL → 67 dL . 100mL / 1 dL = 6700 mL

Density = mass / volume

Volume . Density = mass

6700 mL . 1.005 g = 6733.5 g of NaCl

Answer:

50.3mL of mercury are in 1.50lb

Explanation:

Punds are an unit of mass. To convert mass to volume we must use density (13.546g/mL). Now, As you can see, density is in grams but the mass of mercury is in pounds. That means we need first, to convert pounds to grams to use density and obtain volume of mercury.

Mass mercury in grams:

1.50lb * (1kg / 2.20lb) = 0.682kg = 682g of mercury.

Volume of mercury:

682g Mercury * (1mL / 13.546g) =

Answer:

18 i think

Explanation:

Complete Question

The complete question is shown on the first image

Answer:

1 The main reasons why CH4 has a higher vapor pressure at a given temperature when compared to CH3Cl is that CH4 has a smaller molar mass and does not exhibit dipole to dipole force .

2. The main reasons why H2CO has a higher vapor pressure at a given temperature when compared to CH3OH is that H2CO has a smaller molar mass and does not exhibit hydrogen bonding

3. The main reason why CH3OH has a higher vapor pressure at a given temperature when compared to CH3CH2CH2OH is that CH3OH has a smaller molar mass

Explanation:

The higher vapor pressure of the molecules at the given temperature has been based on the molar mass and the binding between the atoms of molecules.

1. The main reasons why [tex]\rm CH_4[/tex] has a higher vapor pressure at a given temperature when compared to [tex]\rm CH_3Cl[/tex] is that  [tex]\rm CH_4[/tex]:

Thus options b and c are correct.

2. The main reason why [tex]\rm H_2CO[/tex] has a higher vapor pressure at a given temperature when compared to [tex]\rm CH_3OH[/tex] is that [tex]\rm H_2CO[/tex]:

Thus options c and e are correct.

3. The main reason why [tex]\rm CH_3OH[/tex] has a higher vapor pressure at a given temperature when compared to [tex]\rm CH_3CH_2CH_2OH[/tex] is that [tex]\rm CH_3OH[/tex]:

Thus Option c is correct.

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Answer:

d ≈ 3 g/cm³

Explanation:

Density Formula: d = m/v

Step 1: Define variables

mass m = 898 grams

volume v = 300 cm³

Step 2: Substitute and evaluate

d = 898 g/300 cm³

d = 2.99333 g/cm³

d ≈ 3 g/cm³ (1 sig fig)

Answer:

995

Explanation:

1kg = 1000g

lalalalalalalalalalalalallalalalalalalalalalalalalalalalalalalala

Answer:

995kg = 995000g

Explanation:

1 kg = 1000 g

Answer:

f. 0.0537 kg

Explanation:

To solve this, we use the formula for force of buoyancy (Fb) = Vs × D × g

Where; Fb= Force of buoyancy

Vs= Volume of submerged

block

D= Density of water that block

submerges in

g= acceleration due to gravity

In this question, volume of block can be calculated using L×B×H

= 4.3cm × 5.9cm × 2.75cm = 69.7675cm^3

If 77% of the block is submerged in water, then 77/100 × 69.7675cm^3

= 53.72cm^3 is the Volume of submerged block

Density of water is known as 1000kg/m^3 while the gravitational force is 10m/s^2

We need to convert the Vs (volume of submerged block) to m^3 by dividing by 1,000,000

Hence, Vs = 53.72/1000000

Vs= 0.00005372m^3

Using the formula; (Fb) = Vs × D × g

Fb = 0.00005372m^3 × 1000kg/m^3 × 10m/s^2

Fb = 0.5372kg/m/s^2

Therefore, the force of buoyancy of the object on water is 0.5372kg/m/s^2

Recall that; Mass (m) = Volume (V) × Density (D)

Force of buoyancy (Fb) = Vs×D = mass (m) × acceleration due to gravity (g)

i.e. mass = Fb/g

= Mass of the block = 0.5372/10

Mass = 0.05372kg

Therefore, the mass of the block in kg is 0.05372kg

Answer:

from the 1st equation:

  4NH3                  4NO

  4 *(68)                 4*30

  1216                     X  mass of NO = 536.5 g

from the 2nd Equation

  2NO           2NO2

   2*30            2* 46

   536.5          x         mass of NO2 = 822.6 grams

from the 3rd Equation

  3NO2                         2HNO3

   3*(46)                           2* (63)

     822.6                             X                mass of nitric acid = 751.06 gram

b)  % yields = ( 96.2%* 91.3% *91.4%)= 80.3%

Answer:

5 significant figures: 670.90 in.

4 significant figures: 8.314 J/mol-K, 6.022x10 23 mol-1, 0.6258 mg, 2.205 lb and 3270 ft.

3 significant figures: 40.7 g.

2 significant figures: 12 mL, 1.2 years, 7.0 m2, 50, cm and 90 m.

1 significant figure: 0,005 L.

Explanation:

Hello,

In this case, we proceed as follows:

* 8.314 J/mol-K has 4 significant figures since 8, 3, 1 and 4 are significant (nonzero).

* 6.022x10 23 mol-1 has 4 significant figures since 6, 0, 2 and 2 are significant including the zero as it is at the right of the first nonzero digit (6).

* 12 mL has 2 significant figures since 1 and 2 are significant (nonzero).

* 1.2 years has 2 significant figures since 1 and 2 are significant (nonzero).

* 7.0 m2 has 2 significant figures since 1 and 2 are significant (nonzero).

* 50, cm has 2 significant figures since 1 and 2 are significant (nonzero).

* 0,005 L has 1 significant figure since 5 is the only nonzero digit.

* 40.7 g has 3 significant figures since 4, 0 and 7 are significant including the zero as it is at the right of the first nonzero digit (4).

* 670.90 in has 5 significant figures since 6, 7, 0, 9 and 0 are significant including the zeros as they are at the right of the first nonzero digit (6).

* 0.6258 mg has 4 significant figures since the first zero is at the left of the first nonzero digit, therefore, it is not included.

* 2.205 lb has 4 significant figures since 2, 2, 0 and 5 are significant including the zero as it is at the right of the first nonzero digit (2).

* 3270 ft has 4 significant figures since 3, 2, 7 and 0 are significant including the zero as it is at the right of the first nonzero digit (3).

* 90 m has 2 significant figures since 1 and 2 are significant (nonzero).

Regards.

Explanation:

Santiago's sheep in the novel alchemist symbolize, the sheep symbolize the ideals of modesty, simplicity and self-actualization in their peaceful yet fulfilled lives. ...  Santiago also learns the lessons of life by watching his flock, and later these lessons are enhanced when he explores the desert and hears his inner voice.

Answer:

F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).

Explanation:

F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).

Forces acting on box :

We have four forces acting on the box. Taking the upward direction as positive direction for the vertical axis:

- The push, which pushes down along the ramp inclined at 32 degrees. Its vertical component will be , where F is the magnitude of the push

- The weight of the box, of magnitude , with m being the mass of the box and g being the acceleration of gravity (9.8 m/s^2). This force is already directed vertically downward, so we don't need to resolve it into the vertical direction

- The frictional force, of magnitude , where  is the coefficient of friction, directed upward along the inclined plane. Its vertical projection will be

- The normal reaction, whose magnitude is equal to the component of the weight perpendicular to the inclined plane, but with opposite direction (upward): . If we resolve it along the vertical direction.

So, the net force along the y-direction will be:

F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).

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Answer:      Cylinder , Sphere ,  Rectangular prism , Cone

i did an online work

Answer:

The answer is

Explanation:

To find the mass of a substance given the density and volume we use the formula

From the question

Density = 16.3 g/mL

volume = 0.46 L

We must first convert the volume from L to mL

If 1 L = 1000 mL

Then 0.46 L = 0.46 × 1000 = 460 mL

Substitute the values into the above formula and solve

That's

mass = 16.3 × 460 = 7498 g

To convert the mass from g to lbs we use the conversion

1g = 0.0022 Ibs

If 1 g = 0.0022 Ibs

Then 7498 g = 7498 × 0.0022

We have the final answer as

Hope this helps you

Answer:

A salt bridge, in electrochemistry, is a laboratory device used to connect the oxidation and reduction half-cells of a galvanic cell (voltaic cell), a type of electrochemical cell. It maintains electrical neutrality within the internal circuit, preventing the cell from rapidly running its reaction to equilibrium.

Answer:

66 i think

Explanation:

because i add 21+21+24=66

Answer:

kilograms

Explanation:

Answer:B) Kilograms

Explanation:I took the test and got it right!

Answer:

prefix

Explanation:

In a metric system the prefix shows the relationship of each unit to the base unit.

The metric system is an international system of measurement that uses base units of meter for measuring distance, liter for measuring volume and grams for measuring mass.

The metric unit can be smaller or bigger than the base unit, hence, when using the metric system, the prefix shows the relationship between each unit to the base unit.

Thus, we can conclude that the prefix shows the relationship of each unit to the base unit.

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Answer:

Hola Amigo! Here's Ur Answer :D

Explanation:

The chemical reaction we are most familiar with is that of melting: sugar decomposes at a temperature ranging between 184 and 186°C. This is a very recent discovery we owe to a team of researchers in Illinois. Basically, when we heat sucrose gently, this produces a phenomenon known as “ apparent melting ”.

Happy to Help! :D

Answer:

physical change is what the answer above is saying for anybody who is confused

Explanation:

a physical change has to do with appearance while chemical change has to do with composition. melting the sugar does not change the fact its just sugar therefore not changing the composition.

HOPE THIS HELPS!!! :)

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Answer:

Plants are unable to move to a new location in response to changes in their environment. Which of the following organelles plays a role in maintaining homeostasis in a plant? a. Cell Wall b. Chloroplast c. Vacuole d. Nucleus ____ 6. In the diagram below, Cell I and II represent typical cells. In both cells,

Explanation:

:P

Answer:

Vacuole

Explanation:

did it!