A scientist wants to determine the best light wavelength for growing plants. He grows plants in four test groups as shown in the table below. What, if anything, was wrong with the experiment? A. He should only grow one plant in each group.
B. He should only change the wavelength of light for each group.
C. He should add a control group with a CO2 level of zero ppm and a light intensity of zero percent.
D. There is nothing wrong with the experiment.
Answer:
where is the table..............
Answer:
B
Explanation:
I just took the test.
If 42 grams of carbon and 52 grams of oxygen are used, how many grams of CO2 will be produced (Hint: find the
limiting reactant first). SHOW WORK
C + O2 + CO2
Answer:
71.5g
Explanation:
The reaction equation is given as:
C + O₂ → CO₂
Mass of C = 42g
Mass of O₂ = 52g
Unknown:
Mass of CO₂ produced = ?
Solution
Now to solve this problem, we have to find limiting reactant which is the one given in short supply in this reaction.
The extent of the reaction is controlled by this reactant.
Find the number of moles of the given species;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Number of moles of C = [tex]\frac{42}{12}[/tex] = 3.5mol
Number of moles of O₂ = [tex]\frac{52}{32}[/tex] = 1.63mol
Now;
From the balanced reaction equation;
1 mole of C reacted with 1 mole of O₂
We see that C is in excess and O₂ is the limiting reactant.
1 mole of O₂ will produce 1 mole of CO₂
So; 1.63mole of O₂ will produce 1.63 mole of CO₂
Mass of CO₂ = number of moles x molar mass
Molar mass of CO₂ = 44g/mol
Mass of CO₂ = 1.63 x 44 = 71.5g
You have 0.500 L of an 0.250 M acetate buffer solution (i.e. [HC₂H₃O₂] + [C₂H₃O₂⁻] = 0.250 M) at pH 3.50. How many mL of 1.000 M NaOH must you add in order to change the pH to 5.07? Acetic acid has a pKa of 4.74.
Answer:
80mL of 1.00M NaOH
Explanation:
Using H-H equation, we can determine oH of a buffer as acetate buffer. First, we need to determine amount of acetate ion and acetic acid at pH 3.50 and 5.07. Then, with the reaction of NaOH with acetic acid we can find the amount of 1.00M NaOH that must be added:
At pH 3.50:
pH = pka + log [C₂H₃O₂⁻] / [HC₂H₃O₂]
3.50 = 4.74 + log [C₂H₃O₂⁻] / [HC₂H₃O₂]
0.057544 = [C₂H₃O₂⁻] / [HC₂H₃O₂] (1)
Using and replacing in (1):
[HC₂H₃O₂] + [C₂H₃O₂⁻] = 0.250 M
[HC₂H₃O₂] + 0.057544[HC₂H₃O₂] = 0.250 M
1.057544 [HC₂H₃O₂] = 0.250M
[HC₂H₃O₂] = 0.2364M * 0.500L = 0.1182 moles of acetic acid at first pH
At pH 5.07:
pH = pka + log [C₂H₃O₂⁻] / [HC₂H₃O₂]
5.07 = 4.74 + log [C₂H₃O₂⁻] / [HC₂H₃O₂]
2.13796= [C₂H₃O₂⁻] / [HC₂H₃O₂] (1)
Using and replacing in (1):
[HC₂H₃O₂] + 2.13796[HC₂H₃O₂] = 0.250 M
3.13796 [HC₂H₃O₂] = 0.250M
[HC₂H₃O₂] = 0.07967M * 0.500L = 0.0398 moles of acetic acid at first pH
Now, NaOH reacts with HC₂H₃O₂ as follows:
NaOH + HC₂H₃O₂ → NaC₂H₃O₂ + H₂O
As moles of acetic acid decreases from 0,1198 moles - 0,0398 moles = 0,08 moles of acetic acid are consumed = 0,08 moles of NaOH
0,08 mol NaOH * (1L / 1mol) = 0,08L of 1.00M NaOH =
80mL of 1.00M NaOHWHo Plays adopt me on Rob.lox tell me what pets you have and tell me your gender
Explanation:
I have a dog in my dog is a girl
Answer:
me
Explanation:
I'm a girl and I have a RIDE skele-rex and a ride cerberus and a n f r GRIFFIN and a f r gold rat and a normal unicorn a RIDE kitsune
11. Which of the following equations shows a
synthesis reaction?
A
B
C
D
Answer: D
Explanation:
A molecule has sp3 hybridization with 1 lone pair. The electron pair geometry of this molecule is:________ . The geometry of this molecule is:___________ This molecule will have approximate bond angles of (If more than one bond angle is possible, separate each with a space.):______
Answer:
Tetrahedral
Trigonal pyramidal
less than 109.5°
Explanation:
If a molecule has a hybridization of sp3 it must have four electron domains which corresponds to a tetrahedral geometry.
Now we were told that the molecule also has one lone pair. It means that one out of the four electron domains is composed of a lone pair. Thus the molecular geometry will be trigonal pyramidal (e.g NH3).
Recall that lone pairs usually decrease the bond angle to a value less than the expected value for that particular electron domain geometry.
The expected bond angle for a tetrahedral geometry is 109.5° but that of the trigonal planar geometry is less than this.
The boiling point of an aqueous solution is 101.54 ∘C. What is the freezing point
Answer:
101.54 .C.
Explanation:
Using your periodic table, determine the electron configuration of Barium ion, Ba+2
Answer:
im pretty sure the electron configuration of the barium ion Ba+2 is [Kr]5s24d105p6
Explanation:
A material that consists of only one type of element or compound.
Answer:
Pure substance
Explanation:
A material that consists of only one type of element or compound is regarded as a pure substance.
A pure substance has the following properties;
All the parts are the same throughout i.e. they are homogenousThey have a definite composition. They cannot easily be separated or broken down into simpler substances by physical means. Separation by physical methods is not easyThey have unique sets of properties.Compounds and elements are pure substances too.
If a stick of dynamite explodes, the
chemical energy changes into what?______________
potential energy, air and clouds
potential energy and physical
energy
kinetic energy, heat and light
Kinetic energy and precipitation
Answer:
kinetic energy, heat and light i'm pretty sure
If 1.0 mol of N2 and 3.0 mol of H2 in a closed container initially at STP react completely in the reaction shown below, then the final pressure in the flask will be ________ atm at 273 K.
Answer:
[tex]p_f=0.5atm[/tex]
Explanation:
Hello!
In this case, since the reaction between nitrogen and hydrogen produces ammonia:
[tex]N_2+3H_2\rightarrow 2NH_3[/tex]
We can compute the volume of the container by using the ideal gas law at STP (1 atm and 273.15 K):
[tex]V=\frac{4.0mol*0.08206\frac{atm*L}{mol*K}*273.15K}{1atm}=89.7L[/tex]
Next, since nitrogen and hydrogen are in a 1:3 mole ratio, we understand all the nitrogen and hydrogen are consumed and only ammonia remains at the end of the reaction in the following amount:
[tex]n_{NH_3}=1.0molN_2*\frac{2molNH_3}{1molN_2} =2.0molNH_3[/tex]
Thus, the final pressure turns out:
[tex]p_f=\frac{2.0mol*0.08206\frac{atm*L}{mol*K}*273.15K}{89.7L}\\\\p_f=0.5atm[/tex]
Best regards!
Type your answer in decimal form. Do not round.
2/5 tons = pounds
When determining a body's mass, the most popular units to employ are pounds (lb) and kilograms (kg). For correct trade, engineering, and scientific study, accurate conversion between these two is therefore crucial. Here 2/5 tons is 881.84 pounds.
Scales are used in numerous ways to determine a body's weight or mass. To measure various items of various sizes, various sorts of scales are utilized. As the measure of an object's weight, pounds are used. In Britain, this style of weighing in pounds is typical. Additionally, it can be written as Lb or Lbs.
Here 1 tons = 2204.62 pounds
Thus 2/5 tons = 2/5 × 2204.62
2/5 tons = 881.84 pounds
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Element Z has 2 isotopes. A sample of element Z contains 19% Z234 and 81% Z236. What is the average atomic mass of the element Z?
Answer:
Wt Avg of the two isotopes = 235.62 amu
Explanation:
Given:
abundance
Isotope % fractional mass (amu) Wt. Avg. Contributions
Z234 19% 0.19 234 (0.19)(234) = 44.46 amu
Z236 81% 0.81 236 (0.81)(236) = 191.16 amu
Collective Wt. Avg. of all isotopes = ∑ Wt. Avg. Contributions
= 44.46 amu + 191.16 amu = 235.62 amu
Samantha AS
Which of the following compounds is ionic but yet it is expected to
contain covalent bonds as well in the form of a polyatomic ion?
NH3
KBr
CO2
NaF
Fe(NO2)3
Answer:
Fe(NO2)3
Explanation:
A poly atomic ion is an ion that contains more than one atom.
If we look at all the compounds that have been mentioned among the options; KBr and NaF are both ionic but do not contain any covalent poly atomic ion.
However, Fe(NO2)3 contains NO2^+ which is a poly atomic ion that contains the covalent bond.
Si, C, Ni which one is higher in ionization energy?
Answer:
I hope your having a good day, here is the answer to your following question:
C is the most highest energy...i just looked at a Periodic Trends — Ionization Energy
If i get it Right give brainlest
Explanation:
How many kJ of heat are needed to completely melt 1.70 moles of H2O, given that the water is at its melting point? The heat of fusion for water is 6.02 kJ/mole.
Answer:
1.70×6.02=6.4414
Explanation:
it would be times
10.2234 kJ of heat is needed to completely melt 1.70 moles of H2O, given that the water is at its melting point and the heat of fusion for water is 6.02 kJ/mole.
What is latent heat?The term "latent heat" refers to the heat energy that a substance retains when its phase changes during a specific process. The latent heat of evaporation, which occurs when a liquid absorbs heat from an external source at its boiling point, is one of many types of latent heat.
Similarly, the latent heat of fusion is used when any substance melt at its melting point to change the liquid phase of that substance.
As given in the problem, The heat of fusion for water is 6.02 kJ/mole. This means 6.02 kJ heat is needed to melt 1 mole of ice into water
Then the heat are needed to completely melt 1.70 moles of H2O,
Heat = 1.70 moles ×6.02 kJ/mole
Heat = 10.2234 kJ
Thus, the heat needed to completely melt 1.70 moles of H2O is 10.2234 kJ
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5. Rust (Fe2O3) is produced when iron (Fe) reacts with oxygen (O2). Calculate the number
of grams of rust produced when 12 gram of iron react with oxygen.
Answer:
mole ratio = Fe:O2 = 2 : 3
36 grams of iron = how many moles?
well, 36/56 = 0.64 moles
multiply this by 1.5 =0.96 moles
this * 16 =15.43 grams
According to stoichiometry and balanced chemical equation of iron and oxygen 17.15 g of rust is produced when 12 g iron reacts with oxygen.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
The balanced chemical equation for formation of rust when iron reacts with oxygen is,
4 Fe + 3 O₂[tex]\rightarrow[/tex] 2 Fe₂O₃
223.36 g of iron produces 319.38 g of rust
∴ 12 g iron will produce 12×319.38/223.36= 17.15 g of rust.
Therefore, 17.15 g rust is produced from 12 g iron when it reacts with oxygen.
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Suppose you are a chemical engineer working with a client who produces toothpaste.The client wants to add a blue stripe with mint flavor to the toothpaste.What questions would you ask to begin to address the design problem?
Answer:
Explanation:
I would ask him why would he want to add the blue stripe?
why would he want to add the blue stripe in tooth paste? I would ask
What is composition of a toothpaste?A toothpaste is composed of many ingredients like surfactants, abrasive agent, thickening agent, flavors, humectants, solvent, buffer, color, fluoride etc.
Surfactant provide foam, helps to spread the toothpaste throughout the mouth, have detergent action, example is sodium lauryl sulphate.
Abrasive agents have cleaning action like calcium carbonate, calcium phosphate etc.
Thickening agents act as a binder which prevent ingredients from spreading include natural gum, seaweed colloids etc.
Humectants helps to retain water which helps the paste to drying out such as glycerol, sorbitol etc.
Solvents act as a carrier of other ingredients of the toothpaste which makes it flowable and provide hydration.
Buffer is added to stop the toothpaste from being acidic such as trisodium phosphate, sodium citrate etc.
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12. What kind of mixture is formed when oil is mixed with water?
A. Solution B. Water c. colloids D. suspension
Answer:
C. Colloids
Explanation:
Because these two mixtures don't mix
Answer:
D. suspension
Explanation:
I took this assignment the other day and made a 100
Andy rides a a speed of 8 miles per hour. How far does he ride in 3 hours?
Answer:
The answer is 24 miles.
Explanation:
Every hour he rides 8 hours. If he rides for three hours you can take 8 miles x 3 hours which is 24 miles.
The speed of the riding is 8 miles/hours . Within a time of 3 hours Andy will go for a distance of 24 miles.
What is speed?Speed is a physical quantity which measures the distance covered per unit time. The rate of speed is called velocity both having the units m/s, km/hr, miles/hr etc.
Speed is directly related to the distance covered. As the speed increases, distance covered by the object also increases. Whereas as the time increases, distance covered will decreases.
Given the speed of ride = 8 miles/s
time = 3 hours.
Distance = speed × time.
= 8 miles/ hr × 3 hours
= 24 miles.
Therefore, Andy will reach out a distance of 24 miles within 3 hours when ride with a speed of 8 miles/s.
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What is a male reproductive organ?
Answer:
Organs of the male productive system are the scrotum, spermatic ducts, sex glands, and penis. They coinside to produce sperm, gametes, and semen.
Explanation:
I payed attention in health <3 nah jk I am an expert of all things man
xoxo, your highness...Before you can find the mass, what do you need
to know?
Answer:
you need to know what you're finding the mass of.
Explanation:
This is just one example. There are probably more out there, but this is one thing my parents taught me. Hope this helps, and tell me if I'm wrong!
what are tiny cell structures that carry out specific functions within the cell?
Answer: organelles
Explanation:
Similar to the way your stomach, lungs, and heart have different functions in your body, each organelle has a different function within the cell.
Chemistry work here. Please help as soon as possible. I have allot of questions that needs to be answered. Can someone do it for me?
Answer:
I dont know about the yield but I think mno2 is the limiting reactant
According to Boyle’s law, when the pressure of a gas increases at constant temperature, its volume
Answer:
reduces
Explanation:
According to Boyle's law, when the pressure of a gas increases at constant temperature the volume reduces.
Boyle's law states that "the volume of fixed mass of a gas is inversely proportional to the change in pressure if the temperature is constant".
It suggests that at constant temperature, if pressure increases, temperature reduces.Mathematically, it is expressed as;
P1 V1 = P2 V2
P and V are pressures
1 and 2 are initial and finals state.
Boyle's law is stated for the ideal gas at a constant temperature. According to Boyle's law, with an increase in pressure, the volume of the gas decreases.
What is an ideal gas?The ideal gas is given as the gas in which the interatomic collisions are zero, and the changes are produced with the collisions to the walls.
Boyle's law is stated as the gas is at a constant temperature. According to the ideal gas, the pressure and volume are inversely related.
With the increase in pressure, the volume of the gas decreases and vice versa.
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4. Which of the following demonstrates an organ providing a force?
A. The kidney filters waste from blood.
B. The heart contracts and expands to move blood.
C. he eye transmits information to the brain
D. The skin protects other organs from damage.
Answer:
Um uhhhh um 4d
Explanation:
What do we call ingredients in a chemical reaction
Answer:
Reactants or Factors
Explanation:
make the product
Sketch the graph of y = 4 x squared + 32 x + 15 using your graphing calculator. What are the x-intercepts of this graph? a. (-5, 0) and (3.5, 0) c. There are no y-intercepts b. (-2.5, 0) and (-2, 0) d. (-0.5, 0) and (-7.5, 0) Please select the best answer from the choices provided A B C D
Answer: d.) x= -7.5 x= -0.5
Explanation: correct on edge 2021
d) hydrogen and sulfur
Formed
Answer:
At high temperatures or in the presence of catalysts, sulfur dioxide reacts with hydrogen sulfide to form elemental sulfur and water. This reaction is exploited in the Claus process, an important industrial method to dispose of hydrogen sulfide.
PLEASE HELP I WILL GIVE 50 POINTS
Step 1: Create your poster.
On the poster board, draw a roller coaster track that starts with one large hill, followed by a valley, and then another, smaller hill.
Draw a cart in four different positions on the track, as outlined below.
First, draw the cart at the top of the first hill. Label it A.
Second, draw the cart going down the first hill, into the valley. Label it B. iii. Third, draw the cart at the bottom of the valley. Label it C.
iv. Last, draw the cart at the top of the second, smaller hill. Label it D.
c) Draw an energy pie chart above each of the cart’s four positions.
Choose your reference point for determining height.
Create a pie chart that accurately represents the ratio of the three forms of energy and label the sections of the pie Eg for gravitational potential energy, Ek for kinetic energy, and Eth for thermal energy.
Answer:
The one above me is correct! I used it. But of course I had to write a little different to the person's sentences and draw a little differently in my own way.
Explanation:
If somehow you can't open the PDF (the comment on top of my comment) here I took a screenshot of it, if you need it! Good luck everyone :D