To tet the quality of water ource in her area, Shameka collect five ample from each water ource and tet the quality of each ample. Which important tep of cientific deign i Shameka conducting?

repetition
replication
verification of reult
uing controlled variable

Answers

Answer 1

Option (d) is correct. To test the quality of water source in the area, the important technique that Shameka used s verification of results.

To test the quality of water, the qualitative and quantitative measurements are needed from time to time to constantly monitor the quality of water from the various sources of supply. there have to  initiate remedial measures with the suppliers when water supply from outside is polluted. Testing procedures and parameters may be grouped into physical, chemical, bacteriological and microscopic categories.

· The physical tests indicate properties detectable by the senses.

· The chemical tests determine the amounts of mineral and organic   substances that affect water quality.

· Bacteriological tests show the presence of bacteria, characteristic of  pollution.

To learn more about quality of water source please visit:

https://brainly.com/question/8920269

#SPJ4


Related Questions

(True or false) The blood carries hormones to target tissues around the body so the hormones can control the activity of those cells

Answers

Answer:

True

Explanation:

Answer:

True

Explanation:

Hormones  are chemical messengers secreted into blood or extracellular fluid by one cell that affect the functioning of other cells. Most hormones circulate in blood, coming into contact with essentially all cells. However, a given hormone usually affects only a limited number of cells, which are called target cells.

How much force is needed to accelerate a 1000-kg car at a rate of 3 m/s2? a 1003 N b 0.003 N c 3000 N d 333.3 N

Answers

Answer:

Option c.

Explanation:

According to Newton's law, formula to solve this problem is:

F = m . a

Mass → 1000 kg

a → 3 m/s²

F = 1000 kg . 3m/s² →  3000 N

1 N = 1 kg .  m/s²  according to SI, Internation System of units.

Which of the following is a TRUE statement?

a.
A molecule always has three types of elements present

b.
Compounds always include the elements hydrogen and sodium

c.
Compounds include things we use in our everyday lives

d.
All elements prefer to hang out with other elements and form molecules

Answers

Answer:

b

Explanation:

It is going to be B is B is it

A tube contains hydrogen and oxygen gas. Its total pressure is known to be 4.53 atm. It's the pressure of the hydrogen is 2.7 atm, what us the pressure of the oxygen in atm?

Answers

Answer:

1.83 atm

Explanation:

Total pressure is the sum of partial pressures, so the pressure of hydrogen and pressure of oxygen add to equal 4.53 atm

4.53 = 2.7 + Po

Po = 4.53 - 2.7 = 1.83 atm

As altitude increases, what happens to air pressure the choices are it fluctuates, it increases, it decreases or it stays the same

Answers

Answer:

it decreases

Explanation:

It is a common saying the pressure decreases with height. This means that as altitude increases, the pressure of air decreases. The higher you go above sea level, the pressure becomes lesser.

This is as a result of decrease in the amount of air above sea level and hence a decrease in the density of air as altitude increases.

Hence, with increasing altitude, pressure decreases.

Answer:

It decreases

Explanation:

as pstnonsonjoku says in their answer.

I cannot give you anything more than I just did a question on this an it was correct because i'm in a timed test and just happend to see this!

Have a great nightish day!

You had a closed tank of air at a pressure of 4 atm and temperature of 20 degrees Celsius. When the tank and the air are heated to 40 degrees Celsius, what is the pressure if the volume remains constant?​

Answers

Answer:

The pressure will be 4.27 atm.

Explanation:

Gay-Lussac's law can be expressed mathematically as follows:

[tex]\frac{P}{T} =k[/tex]

Where P = pressure, T = temperature, K = Constant

This law indicates that the quotient between pressure and temperature is constant.

This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.

You want to study two different states, an initial state and a final state. You have a gas that is at a pressure P1 and a temperature T1 at the beginning of the experiment. By varying the temperature to a new value T2, then the pressure will change to P2, and the following will be fulfilled:

[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]

In this case:

P1= 4 atmT1= 20 C= 293 K (being 0 C= 273 K)P2= ?T2= 40 C= 313 K

Replacing:

[tex]\frac{4 atm}{293 K} =\frac{P2}{313 K}[/tex]

Solving:

[tex]P2= 313 K* \frac{4 atm}{293 K}[/tex]

P2= 4.27 atm

The pressure will be 4.27 atm.

can someone help me ??​

Answers

Answer:

6)B.C,Ge,Pb,Si

7)A.Be,Mg,Sr

8)D.arsenic,calcium

9)B.Group 13,period 3

Earthquakes and what kind of plate boundary movement cause them?

Answers

Convergent plate boundaries if I’m not mistaken

Over millions of years silt washed into a lake formed layers of sedimentary rock. What type of rock was likely formed?

Answers

Answer:

Explanation:

siltstone

Over millions of years, silt washed into a lake formed layers of sedimentary rock. What type of rock was likely formed? A type of detrital sedimentary rock called siltstone was the likely product of this process.

pleaaseeee help im failing so bad3

Answers

primary and secondary!

Select the correct answer.
Which of the following is the Arrhenius equation?

A.
K=AeEa/RT

B.
K = -AeEa/RT

c.
K = Ae-Ea/RT

D.
K = -Ae-Ea/RT

Answers

Answer:

The answer is C

Explanation:

Can yall help me with this one, thanks!

Answers

Answer:

Element   atom    molar mass     Total        % composition

Na               1            23                    40             57.5 %

O                 1            16                     40              40%

H                1               1                      40              2.5 %

The given compound is NaOH.

Na : number of atom= 1

Molar mass= 23 g/mol

Total mass of NaOH = 40 g/mol

% composition by mass = [tex]\frac{\text {mass of atom}}{\text {Total mass}}\times 100=\frac{23}{40}\times 100=57.5\%[/tex]

O : number of atom= 1

Molar mass= 16 g/mol

Total mass of NaOH = 40 g/mol

% composition by mass = [tex]\frac{\text {mass of atom}}{\text {Total mass}}\times 100=\frac{16}{40}\times 100=40\%[/tex]

H : number of atom= 1

Molar mass= 1 g/mol

Total mass of NaOH = 40 g/mol

% composition by mass = [tex]\frac{\text {mass of atom}}{\text {Total mass}}\times 100=\frac{1}{40}\times 100=2.5\%[/tex]

What does the charge tell you about an atom?
Brainliest!!!!!!

Answers

Answer:

The charge will tell you if the atom is neutral, positive, or negative. "The charge of an atom is the number of protons minus the number of electrons."

If those same 25 grams are carbon are reacted, how many moles of carbon dioxide will be produced?​

Answers

Answer:

I'm am so cool I'm depressed tho so yeah good job lady

Explanation:

An organism whose cell contains a nucleus.

Answers

Answer:

Eukaryotes

Explanation:

how acceptance of responsibility influence affective in communication​

Answers

Answer:

f

Explanation:

Hey guys so my cuz gave me this stone when he went to mexico
can u plz tell me what kind of stone this is?

Answers

Looks like candy lol .....

When performing a neutralization reaction, how should students test the solution to be sure which is the acid and which is the base?

Answers

Explanation:

La reacción entre un ácido y una base se llama neutralización. Cuando en la reacción participan un ácido fuerte y una base fuerte se obtiene una sal y agua. Si una de las especies es de naturaleza débil y la neutralización se produce en disolución acuosa también se obtiene su respectiva especie conjugada y agua.

Do you think it is a good idea for all scientists to use the same periodic table of elements? Why or why not?

Answers

Yes because what other else can a scientist have

Pick one answer do not put any links please

Answers

The answer is D! This adaptation helps the eel fend off potential threats! Hope this helps, have a great day!

How many grams of Si are there in a sample of Si that contains the same number of moles as a 60.8 gram sample of P?

Answers

Answer:

55.1 g Si.

Explanation:

Hello there!

In this case, for the given mole-mole relationship, it is possible to set up the following mole ratio as the moles of Si and P are the same:

1 mol Si = 1 mol P.

Next, since one mole of silicon has a mass of 28.09 g and one of phosphorous of 31.0 g, we can set up the following expression for the mass of silicon:

[tex]60.8gP*\frac{1molP}{31.0gP}*\frac{1molSi}{1molP}*\frac{28.09gSi}{1molSi}[/tex]

Therefore, the result is 55.1 grams of silicon.

Best regards!

Which of the following could be added to a solution of potassium fluoride to prepare a buffer?
A) ammonia
B) potassium acetate
C) hydrochloric acid
D) sodium fluoride
E) sodium hydroxide

Answers

I think the answer will be sodium hydroxide and the reason why is because
Sodium hydroxide is the answer

Instructions: Use the periodic table to answer the questions below:
1) How many periods are there on the periodic table?
2) How many groups are there on the periodic table?
3) Which element is found in Group 2 and Period 3?
4) Which element is found in Group 17 and Period 2?
5) Which element is found in Group 10 and Period 4?
6) Which element is found in Group 18 and Period 6?
7) Which element is found in Group 1 and Period 7?
8) Which element is found in Group 14 and Period 6?

Answers

Answer:

1. 7 periods

2. 18 groups

3.Magnessium

4.Fluorine

5.Nickel

6.Radon

7.Francium

8.Lead

Explanation:

Number 8


in metals, reactivity increases ____ across a period, and in non metals reactivity increases ____ across a period.


A. to the left,to the left
B. to the left, to the right
C. to the right , to the left
D. to the right, to the right

Answers

It’s B. To the left,to the right

❤️

Y’all I need help ASAP

What are the correct numbers to balance this equation......?

__NaCI2+__Col2——> __Nal2+__CoCI2

Answers:
1)not possible to balance
2) 2...2—>...2...2
3) 3...3—>...3...3
4)it’s already balanced.

Answers

Answer:

yes it is already balanced

just a tricky question!!

Explanation:

Organisms change energy from the environment or from their food into other types of energy. This is called what?

Answers

Answer:

Metabolism

Explanation:

This is called Metabolism.

Metabolism is a combination of spontaneous chemical reactions which release non-spontaneous energy and chemical reactions requiring energy to proceed. In order to perform cellular processes, living organisms can take energy from food, nutrients or sunlight.

Which of the following are things that may change during an experiment?

Answers

Answer:

The things that are changing in an experiment are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types.

A container at equilibrium contains the following concentrations: [Hz] - 0.30 M and [HI]
0.90 M. The equilibrium constant is equal to 6.0. What is the concentration of I2 at
equilibrium?
Hzig) + 1218 = 2 Hle)

Answers

Answer: The concentration of [tex]I_2[/tex] at equilibrium is 0.45 M

Explanation:

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as [tex]K_c[/tex]  

For the given chemical reaction:

[tex]H_2(g)+I_2(g)\rightarrow 2HI(g)[/tex]

The expression for [tex]K_c[/tex] is written as:

[tex]K_c=\frac{[HI]^2}{[H_2]^1[I_2]^1}[/tex]

[tex]6.0=\frac{(0.90)^2}{(0.30)^1\times (I_2)^1}[/tex]

[tex][I_2]=0.45M[/tex]  

Thus concentration of [tex]I_2[/tex] at equilibrium is 0.45 M

What is the formula to find
moles

Answers

Explanation:

these are the formula that u need to know

1. moles= concentrate × volume

2. moles = mass / mr

3. moles = volume in dm3 / 24dm^3

4. moles = Pressure in pa × Volume in m3 / 8.031 × temperature in K

hope this helps :)

The nicotine molecule cannot make ionic bonds. Change nicotine into a different molecule, one that can now can make ionic bonds.

Answers

Answer:

See explanation

Explanation:

Nicotine is a covalent molecule. Recall that covalent molecules are not soluble in water and do not have any kind of ionic interaction.

Let us recall that nicotine contains a nitrogen atom having a lone pair of electrons. When nicotine reacts with HCl, this lone pair is protonated to form the ionic compound called nicotine hydrochloride.

C₁₀H₁₄N₂ + HCl --------> C₁₀H15N₂Cl

Other Questions
Is x 3 a factor of the polynomial x 3x 4x 12? How do you calculate the speed of emitted photoelectrons? Who takes over if something happens to the president? Is 4096 a perfect cube if yes then what is the number whose cube is 4096? which of the following pedigrees shows a likely pattern of inheritance in a family with a history of cystic fibrosis? What is the most important point that the authors make in this paragraph most enslaved people worked under fair to good conditions? Generally, technological advance is generated by the discovery of new _____, which allows _____ to be combined in improved ways to increase output. Find the perimeter of the figure shown below The distance between Eagle and lake and swallow lake on a mob is 9 cm the scale of the map is 14 m equals KM what is the actual distance between Eagle Lake and swallow lake? What is the equation in the slope intercept form of a line passing through the given points 1 and 1 and 3 and 7? You can work no more than 60 hours each week at your two jobs. Dog walking pays $7 per hour and your sales job at Computers & More, Inc. pays $12 per hour. You need to earn at least $450 each week to pay your bills. Your friend solves the system of inequalities and tells you that a possible solution is I rent a gym for $150 for 30 students. Another time I rent the gym for $350 for 70 students. What is my rate per student? Do students prefer online learning or traditional classroom? Henrik buys 40 collectible cards per month. Kharif sells 20 cards from his collection of 180 each month. When will Henrik have more cards than Kharif? Show your work. What is a focused research question? a map has a scale of 1cm to 12km on a map ,the distance between cardiff and london is 20cmwhat is the real distance,in km, between cardiff and london Breathing is controlled solely by the medulla oblongata and pons. FALSEThe rate of oxygen diffusion is affected by the pressure gradient of carbon dioxide. FALSEAccording to the Bohr effect, a low level of oxyhemoglobin enables the blood to transport more CO 2 .FALSEHemoglobin releases the same amount of oxygen to all the tissues regardless of variations in their metabolic rate. FALSE(could you explain these questions? thank you. ) What does a political campaign director do? Did Buddhism have a major influence on Chinese society and government? Click to select the behaviors that support weight management Eat breakfast Take weight loss supplements advertised on Infomercials Keep a food journal Restrict energy intake to less than 1200 kcal/day Pack healthy snacks for a long day on campus Reduce energy intake by about 500 kcal per day Avold weighing oneself on a scale Plan physical activity into the day