An experimental group and a control group are both included in a controlled experiment. At least one of the two groups—the group that is not subjected to the experimental treatment—is present in a controlled experiment.
In controlled experiment, the researcher wants to determine how one or more variables affects on something. Since many different variables affecting the results, and most of them are not of interest to the researcher, and they will kept under control. They must remain constant. There must be at least of two groups. One of them is control group, and the other one is experimental group.
During experiment, a researcher compares between two groups. Both are composed of individuals which is coming from same population, so they are very identical in all the aspects except for independent variables that the researcher changes in to the experimental group and they observe that how they will affect the individuals. Control group is used to identify any of the other factors influencing the results which is obtained in the study, apart from the modified variables of the treatment. Independent variable keeps constant in control group.
The experimental group receives the treatment. The researcher voluntarily modifies the independent variable's values to see how it impacts the subjects. There can be several experimental groups.
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help help help help help help
Hey,
Answer:
AgCl (Silver Chloride)
Explanation:
sodium chloride + silver nitrate → sodium nitrate+ silver chloride
Hope it helps :)
Have a great day!
FOR MY FINAL PLEASE HELP OMG IM FREAKING OUT
Answer:
4400, and 0
Explanation:
since they traveled 2200 in one direction, to return home they must travel that distance again, so they travel 4400
displacement is the distance from the start point, so since they are back home at the end of the trip, they did not get displaced at all
if you have any questions, leave them in the comments and i will try to answer them, if this helped, pls give brainliest
Answer:
My answer to the question is 4400 and 0
Question 1 For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. HCl(aq) + NaOH(aq) + NaCl(aq) + H20(1)
A student was given the task of titrating a 20.mL sample of 0.10MHCl(aq) with 0.10MNaOH(aq). The HCl(aq) was placed in an Erlenmeyer flask. An equation for the reaction that occurs during the titration is given above. (a) According to the equation for the reaction, if the amount of the reactants is halved, how does this affect the amount of H20(I) produced in the reaction?
Titration is a quantitative analysis method for determining the concentration of a substance from a measured titrant. According to the equation, if the reactants are halved, the amount of H2O produced will be halved.
The molecular equations for sodium hydroxide, hydrochloric acid, sodium chloride, and water can be expressed as:
HCl + NaOH ⇒ NaCl + [tex]H_{2}[/tex]O
In the given equations, the spectator ions and the ionic equation can be distinguished as follows:
H⁺ + Cl⁻ Na⁺ + OH⁻ ⇒ Na⁺ + Cl⁻ + 2H⁺ + O⁻²
The net ionic equation is:
H⁺ + OH⁻ ⇒ [tex]H_{2}[/tex]O
From the above equation, we can see that the production of water molecules depends on the number of reactants. The reactants are,
H⁺ and OH⁻.
Therefore, when the number of reactants is halved, the resulting water molecules are halved.
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Balance the equation
KCIO3–> O2+ KCI
Answer: 2KCIO3–> 3O2+ 2KCI
Explanation:
Explanation:
2KCLO3=3O2+2KC
hope this helps
Significant Figures: How many significant figures
are in 865,010?
Answer: There are five significant figures in 865,010.
Explanation:
When a degree of accuracy is stated by each digit present in a mathematical figure then it is called a significant figure.
Rules for counting significant figures is as follows.
Any non-zero digits and zeros present between a non-zero figure are counted. For example, 3580009 has seven significant figures.Trailing zeros are counted in a non-zero figure. For example, 0.00250 has three significant figures.Leading zeros are not counted. For example, 0.0025 has two significant figures.So, in the given figure 865010 has five significant figures and the trailing zero will not be counted.
Thus, we can conclude that there are five significant figures in 865,010.
Suggest a procedure for separating iron shavings from sawdust. Explain why this procedure would work.
Dont send a file i will report you if you do
Answer:
Magnetic separation
Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.
Explanation:
Separation techniques makes use of the differences in the properties of components of mixtures to separate theses components, one from another.
In a moxturemof iron shavings and sawdust, a suitable separation technique would be the use of magnetic separation.
The use of this separation technique is abasednonnthe principle that when a magnetnis brought near to a mixture containing magnetic and non-magnetic materials, the magnetic materials will be separated from the non-magnetic materials due to their attraction to the magnet. Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.
What is the molar mass of (NH4)3PO4
Answer:
the molar mass of (NH4)3PO4 is 149.09 g/mol
Need the remaining questions answered thank you
Explanation:
14) We need to find the # of moles of NaOH in 3.5 L solution. Note: 1 M = 1 mol/Ll
(3.00 mol NaOH/1 L)(3.5 L) = 10.5 mol NaOH
Next we need find the volume of 19.4M NaOH solution that contains 10.5 mol NaOH:
(10.5 mol NaOH)×(1 L NaOH/19.4 mol NaOH)
= 0.541 L NaOH
This means that 0.541 L (541 mL) of 19.4M NaOH solution must be diluted to 3.5 L in order to get 3.00M NaOH solution.
15) 425 mL (0.425 L) of 0.105M HCl solution contains
(0.105 mol HCl/1 L)×(0.425 L) = 0.0446 mol HCl
so when enough water is added to 1L, the molarity becomes
0.0446 mol HCl/1 L = 0.0446M HCl
16) CaBr2 ---> Ca^+2 + 2Br^-1
For every Ca^+2 ion in the solution, you have 2 Br^-1 ions
If the concentration of CaBr2 is 6 mol/L (or 6M),.then the concentration of Br^-1 irons is
[Br^-1] = 2×[Ca^+2] = 2×(6 mol/L) = 12 mol Br^-1/L
17) The reason you won't need 1.0 L of water is that part of the volume of the solution is taken up by the NaOH so you will always need slightly less than 1 L.
IF ANYONE HAS THE ANSWERS TO ANYOF THESE PLEASE I NEED THEM RLLY BAD :(
its BalancingChemEquations part B gizmo
Answer:
For the second to last problem the coefficients is 1, 5, 3, and 4 and the last problem all the coefficients are 1's
Explanation:
For the second to last problem you put 3 next to CO₂ so C is 3 on both sides. Then you put 4 next to H₂O because H will then be 8 on both sides. Lastly you put 5 next to O₂ which will make 10 on the reactant side. On the product side the 3 next to CO₂ will make O on the product side 6 and the 4 next to H₂O will make O on the product side 4. You will then add both together and it will make 10, which will make 10 on both sides. Hope this helps!
The compound NaCl consists of 60.7% chlorine. How many grams of chlorine can be obtained from 49.6 grams of NaCl?
Answer:92.1g
Explanation:
This means that the reaction consumed4.004moles NaCl⋅2 moles Na2moles NaCl=4.004 moles NaConvert this to grams by using the element's molar mass4.004moles Na⋅22.99 g1mole Na=92.1 g
A bike travels at a constant speed of 4.0 m/s for 5 s, how far does it go?
Answer:
20 meters
Explanation:
The bike is moving at a rate of 4 meters per second. In 5 seconds, the bike would have gone 20 meters
4 m/s x 5s = 20 m
Answer:
20 miles
Explanation:
I need help ASAP!!!! Which of the following is an advantage of using nuclear power plants to
produce electricity?
A) Radioactive waste from nuclear reactors is now being used to power cars,
B) There are no hazardous byproducts from nuclear reactions,
C) Nuclear power does not produce greenhouse gasees
Answer:
The answer is C.
Explanation:
Answer:
C is right i yeah C is right
PLEASE HELP!!! What do nonmetals and metals tend to do when they react?
Nonmetals tend to lose protons while metals tend to gain protons.
Nonmetals tend to gain protons while metals tend to lose protons.
Nonmetals tend to gain electrons while metals tend to lose electrons.
Nonmetals tend to lose electrons while metals tend to gain electrons.
Answer:
Nonmetals tend to gain electrons while metals tend to lose electrons.
Explanation:
The statement that describes the reaction of nonmetals and metals is "Nonmetals tend to gain electrons while metals tend to lose electrons."
What are metals and non-metals?Metals (such as copper and aluminum) are good heat and thermal conductors, whereas nonmetals (such as phosphorus and sulphur) are considered to be insulators.
When a metal reacts with a nonmetal, the metal loses electrons while the nonmetal gains electrons. In order to achieve their nearest noble gas configuration, elements can gain or lose electrons. The formation of ions for the octet's completion aids in their stability. Metals lose electrons to complete their octet in a reaction between metals and nonmetals, while nonmetals acquire electrons to complete their octet.
When metal atoms produce ions, they lose electrons from their outer shell; the ions are positive because they contain more protons than electrons. The ions that are generated have complete outer shells. The ions have a full outer shell and have the electrical structure of a noble gas (group zero element).
Nonmetals are found further to the right on the periodic table and have high ionization energy and electron affinities, making them comparatively easy to absorb electrons and difficult to lose them. They also have a higher number of valence electrons, and are on the verge of completing an octet of eight electrons.
Hence the correct answer is nonmetals tend to gain electrons while metals tend to lose electrons.
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A world without friction would it be?
Bill Nye Video
Answer:
it opposes motion. the object would continue to slide forever if not stopped by another object.
Please help me with this question it’s due in five minutes I’ll give brainliest
Define molarity of a solution.
Answer:
Molarity of a solution is defined as
the amount of a substance in a certain volume of solution or the moles of a solute per liters of a solution and also known as the molar concentration of a solution.
The units of molarity are M or mol/L
Define molarity of a solution.
Answer:Molar concentration or Molarity is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
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What are some examples of evidence that support Darwin's theories of evolution and natural selection?
Some examples of evidence that support Darwin's theories of evolution and natural selection , such as fossils and similarities between related living organisms.
Darwin employed certain sorts of evidence to support his hypothesis of natural selection, and these types of evidence are still used today. Examples include fossils and similarities between related living animals. Others, like DNA analysis, were unavailable to Darwin's generation but are now employed by scientists to further our understanding of evolution. evidence supporting evolution: fossil strata, remains of extinct organisms, similarities between current-day organisms, DNA similarities, and embryonic similarity. Artificial selection, or breeding, is a crucial sort of evidence that Darwin looked at and is being looked at and employed today.
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which best describes oogenesis?
Explanation:
Oogenesis can be defined as a process of differentiation of egg cell (ovum), into a mature ovum that further develops after fertilization. In humans, oogenesis begins in the early stage of embryonic development, during whcih primary oocyte performs meiosis I and forms secondary oocyte.
what is physiography ?
Answer:
Physical geography is one of the two fields of geography. Physical geography is the branch of natural science which deals with the processes and patterns in the natural environment such as the atmosphere
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17.2H2 + O2 – 2H20
How many moles of oxygen are needed if 8 moles H2 are used?
A semen sample is received in the laboratory for evaluation of fertility. No sperm are observed upon initial microscopic examination of the sample. How should you proceed
Laboratories are used in many different fields, including medicine, chemistry, biology, physics, engineering, and more.
What is laboratory?A laboratory is a facility where scientists conduct research and experiments. It is equipped with specialized equipment, tools, and supplies required for the specific purpose of conducting scientific tests, experiments, and analysis.
The next step would be to look for other seminal components, such as white blood cells, red blood cells, epithelial cells, and other organic and inorganic components. If no sperm are present, then a detailed analysis of the sample is necessary to determine the cause of the absence of sperm. Possible causes of azoospermia, or the absence of sperm, include hormonal imbalance, anatomical defects, genetic conditions, and medical treatments.
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Which energy changes in the enthalpy of solution are endothermic, and which are exothermic?
Hsolute and H solvent are endothermic; Hmix is exothermic.
Hsolute is endothermic; Hsolvent and Hmix are exothermic.
Hsolute is exothermic; Hsovent and Hmix are endothermic.
Hsolute, Hsolvent, and Hmix are all exothermic.
Which of the following techniques can be used to separate a heterogeneous mixture into its component parts? (3 points)
Sort by color
Separation by density
Apply heat
Apply pressure
Answer:
Separation by density
Hope this helps
Explain how you can determine if an object is accelerating. Give two examples
Answer:Acceleration has to do with changing how fast an object is moving If an object is not changing its velocity, then the object is not accelerating. Anytime an object's velocity is changing, the object is said to be accelerating it has an acceleration.
Explanation:
How do you make the balanced equation of making ammonia?
__ N² + __ H² → __ NH³
(with steps to solve)
Answer:
1, 3, 2
Explanation:
1 mole of N^2 so you have 2 N.
3 mole of H^2 so you have 6 H.
2 mole NH^3 so you have 2 N and 6 H
2N + 6H = 2N + 6H
200. 00 grams of an organic compound is known to contain 83. 884 grams of carbon, 10. 486
grams of hydrogen, 18. 640 grams of oxygen and the rest is nitrogen. What is the
empirical formula of the compound?
An empirical formula is a type of chemical formula that shows the simplest ratio of elements present in a compound, rather than the total number of atoms.
What are Atoms?
Atoms are the smallest indivisible particles that make up all matter in the universe. They consist of a nucleus containing protons and neutrons, surrounded by a cloud of electrons. Atoms make up all elements, which are the building blocks for all other forms of matter.
Step 1: Calculate the atomic mass of carbon, hydrogen, oxygen, and nitrogen.
Carbon: 12.011 g/mol
Hydrogen: 1.008 g/mol
Oxygen: 15.999 g/mol
Nitrogen: 14.007 g/mol
Step 2: Convert the mass of each element to moles.
Carbon: 83.884 g / 12.011 g/mol = 6.983 mol
Hydrogen: 10.486 g / 1.008 g/mol = 10.381 mol
Oxygen: 18.640 g / 15.999 g/mol = 1.164 mol
Nitrogen: (200.00 g - (83.884 g + 10.486 g + 18.640 g)) / 14.007 g/mol = 6.871 mol
Step 3: Divide each mole value by the smallest mole value to obtain the simplest whole number ratio.
Carbon: 6.983 mol / 6.983 mol = 1
Hydrogen: 10.381 mol / 6.983 mol = 1.485
Oxygen: 1.164 mol / 6.983 mol = 0.167
Nitrogen: 6.871 mol / 6.983 mol = 0.985
The empirical formula of the compound is CHNO.
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consider the following organic compounds ;propene butane ethanol and ethyne. which of these is an isomer of methyl propane.
Can someone help me with this question pls?
Explanation:
frequency = 1 wave/10s = 0.1 Hz
wavelength = 5.8 m
speed = wavelength × frequency
= (5.8 m)(0.1 Hz)
= 0.58 m/s
A student standardized a solution of NaOH and found that the concentration was 0.542 M. They then used it to titrate a monoprotic acid. If 50.40 mL of the base was used, how many moles of acid were neutralized? (Do not report your answer in scientific notation)
Answer:
0.0272 moles
Explanation:
The number of moles of acid that were neutralized can be found by multiplying the volume of the base (in liters) by its concentration (in moles/liter) and then multiplying that value by the stoichiometric coefficient of the acid in the balanced chemical equation for the neutralization reaction.
To begin, we need to convert the volume of the base from milliliters to liters.
50.40 mL = 0.0504 L
Next, we can multiply the volume of the base (in liters) by its concentration (in moles/liter) to find the number of moles of base used in the titration.
0.0504 L * 0.542 M = 0.0272 moles
Since this is a neutralization reaction between a monoprotic acid and a strong base, the acid:base ratio is 1:1.
So the acid that has been neutralized is also 0.0272 moles.
Cuántos moles de hipoclorito de sodio (NaCIO)se generan cuando reaccionan 5 moles de NaOH
Answer:
5 mol NaOH = 5 mol NaClO
Plantear y balancear reacción: NaOH + HClO ⇒ NaClO + H2O
Como se puede apreciar, los coeficientes estequiométricos son uno por lo tanto, la cantidad de NaClO que se genera será igual a la cantidad de moles que reaccionan de NaOH