To identify why a metal measurement was different in the experiments look for the variable that was different in the experiment and analyze how this change affected the results.
What is an experiment?An experiment is a procedure that aims at probing or discovering something. For example, you can test if a plant grows faster/slower by using an experiment.
What causes different results in similar experiments?The most common cause for this situation is that one of the factors or variables is slightly different. For example, if I add 50mL of water to a plant rather than 20mL of water every day this might cause different results.
Based on this, if the metal content was different you should analyze if any of the factors changed in this experiment and find out how this change affected the general results.
Note: This question is incomplete because there is limited information about the experiment; due to this, I answered it based on general knowledge.
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Which component of the steam sterilizer is the coolest?
Answer:
Thermostatic valve
Explanation:
"Is located in the drain line; the drain and the area surrounding it are the coolest areas in the sterilizer. A sensor in the chamber drain measures steam temperature and automatically controls the flow of air and condensate from the sterilizing chamber."
Hope this helps
You need to make a 1:4 dilution of dye in water so that the total volume in test tube one is 60 ml.
From the solution you made in test tube one, you need to make a 1:5 dilution into test tube two so that the total volume is 15 ml.
Find Transfer Volume
Find Diluent
Find TDF
In the serial dilution for the preparation of the dye, the total dilution factor is 1/20
What is dilution of solution?Dilution is the process of preparing solutions of lesser concentration from a more concentrated solution.
In test tube 1:
Total volume = 60 mL
Dilution factor = 1:4
1 parts stock solution is required for every four parts diluent
Total parts = 5
volume of diluent = 4/5 × 60 mL = 48 mL
48 mL of diluent is added to 12 mL of stock solution to prepare the solution in test tube 1.
In test tube 2:
Total volume = 15 mL
Dilution factor = 1:5
1 parts stock solution is required for every five parts diluent
Total parts = 6
volume of diluent = 5/6 × 15 mL = 12.5 mL
12.5 mL of diluent is added to 2.5 mL of stock solution from tube 1 to prepare the solution in test tube 2.
Total dilution factor = 1/4 × 1/5 = 1/20
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Suzie made the following observations while spending the weekend at her
grandmother's home.
1.
II.
Red beans swell when soaked in water
Cucumber springs water when salt is added to it
She can tell when her sister is around from the scent of her perfume
II.
a. State TWO general deductions which can be made from all these
observations about the nature of matter. (4 marks)
b. Use your deductions in (a) above to explain observation III. (3 marks
Answer:
...
Explanation:
i lowkey dont know what to put, i just need my points srry;(
Is it an acid or alkaline that is added to a metal to make it oxide
please answer it is Urgent
Answer:
i am not sure but is it hydrogen oxide
Explanation:
Based on the observations of how the different forms of salt start mixing with the
water, which type of salt particle do you expect to fully dissolve at the end of the 45
minutes?
Fine
Coarse
Pellet
An ideal gas sample occupies 1.50 L at 25.0 o C and 741 mm Hg. How many moles are there in the sample
Ideal gas law is valid only for ideal gas not for vanderwaal gas. There are so many laws that are deduced from ideal gas equation. There are 0.05mole in the sample occupies 1.50 L at 25.0 o C and 741 mm Hg.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
P×V=n×R×T
where,
P = pressure of ideal gas= 741 mm Hg= 0.97 atm
V= volume of ideal gas =1.50 L
n =number of moles of ideal gas
T =temperature of ideal gas =25°C =298K
R = Gas constant = 0.0821 L.atm/K.mol
substituting the values
P×V=n×R×T
0.97 atm ×1.50 L=n×0.0821 ×298
number of moles of ideal gas =0.05mole
Therefore, there are 0.05mole in the sample occupies 1.50 L at 25.0 o C and 741 mm Hg.
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Fill in the coefficients to balance the equation for the chemical reaction that occurs:
_NaCl(aq) + _AgNO3(aq) --> _AgCl(s) + _NaNO3
Answer:
The equation is balanced
Explanation:
NaCl (aq) + AgNO3(aq) ––> AgCl (s) + NaNO3 (aq)
NaCl (aq) + AgNO3 (aq)
Na = 1 , Cl=1 , Ag = 1 , No3= 1
AgCl (s) + NaNO3 (aq)
Ag = 1 , Cl=1 , Na = 1 , No3= 1
You will be performing many dilutions in this experiment. If John adds 17.51 mL of 6M HCl to 6.36 mL of distilled water, what is the final concentration, in M, of HCl
The molarity of the solution decreases on dilution by adding distilled water. The molarity of the solution of 17.51 ml , 6 M HCl when added to 6.36 ml is 4.4 M.
What is molarity ?Molarity is a common term used to express the concentration of a solution. The molarity of a solution is the ratio of the number of moles of solute to the volume solution in liter.
If a solution of volume V1 ml with M1 molarity is diluted to V2 ml of M2 molarity, then, the relation between the two concentrations is written as:
M1 V1 = M2 V2.
given, M1 = 6 M
V1 = 17.51
the volume after the addition of 6.36 ml water, v2 = 17.51 + 6.36 = 23.78 ml
then M2 = M1 V1/V2
M2 = 6 M × 17.51 ml/ 23.78 ml
= 4.4 M.
Therefore, the molarity of the solution after dilution is 4.4 M.
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1 A pump with an 80% efficiency drives water up between two reservoirs through a piping system of total length L = 15 and circular cross -section diameter d = 7 cm. The reservoirs are open to the atmosphere at an ambient temperature of 20 C. The difference in elevation between the free surface can be accounted for by the local loss coefficients Kentrance Kexit 1.0, Kelbow 0.4. If the volumetric flow rate in the system Q = 10 Liter/s, and the surface roughness of the pipe is = 0.15 mm, calculate:
(a) The average water flow velocity in the pipe.
Which of the following represents the raw materials of photosynthesis?
a. water and glucose
b. carbon dioxide and water
c. carbon dioxide and oxygen
d. glucose and oxygen
Answer:
B.
Explanation:
B. Carbon dioxide(CO2)and water(H2O)
they represent the raw material of photosynthesis.
hope this helps you
Calculate the wavelength of an electromagnetic wave with a frequency of 8.68 * 10 ^ 16 * H * z ; 5.0 * 10 ^ 14 * H * z and 1.00 * 10 ^ 6 * H * z .
Answer:
3.46 x 10^-9 m; 6.0 x 10^-7 m; 3.00 x 10^20 Hz
Explanation:
I'm not 100% sure abt the last one
The wavelength of the electromagnetic wave with frequencies of 8.68×10¹⁶ H z, 5.0 ×10¹⁴ Hz, and 1.00× 10⁶ Hz is equal to 3.45nm, 6.00 nm, and 30 nm respectively.
What are frequency and wavelength?The frequency of the electromagnetic wave can be described as the number of oscillations of an electromagnetic wave in one second. The frequency of a wave has S.I. units which are represented as per second or hertz.
The wavelength of the electromagnetic wave is the distance between the two adjacent points in phase w.r.t. each other.
The relationship between wavelength (λ), frequency, and speed of light (c) of electromagnetic waves are:
c = νλ
Given, the frequency of the wave, ν = 8.68×10¹⁶ Hz
The speed of light, [tex]c = 3\times10^8 m/s[/tex]
The wavelength of the electromagnetic waves can determine from the above-mentioned relationship:
λ = c/ν = 3×10⁸/8.68×10¹⁶ = 3.45 × 10⁻⁹ m. = 3.45 nm
Given, the frequency of the wave, ν = 5.0 ×10¹⁴ Hz
λ = c/ν = 3×10⁸/5.0 ×10¹⁴ Hz = 6 × 10⁻⁹ m. = 6.00 nm
Given, the frequency of the wave, ν = 1.00× 10⁶ Hz
λ = c/ν = 3×10⁸/1.00× 10⁶ Hz = 3.00 × 10⁻⁸ m. = 30 nm
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Length (miles)
1
1.3
2.
3.2
3
0.9
4
1.8
What is the shortest measurement you made, in SI units? 1 mi = 1.61 km.
A. 3.2 km
B. 7.2 km
C. 1.4 km
D. 5.2 km
Answer:
The answer is 1.4 km
Explanation:
Which of these has the greatest freezing point depression? Which of these has the greatest freezing point depression? Aqueous solution of NaCl (m = 0.01) Aqueous solution of CaCl2 (m = 0.01) Aqueous solution of C12H22O11 (m = 0.01) Pure water
The substance with the higher freezing point depression is CaCl2.
What is water's freezing point?Water freezes at 0° C in normal conditions but once water is mixed with other substances this temperature can change.
How does the freezing point change?As previously mentioned, the freezing point changes according to the substance water is mixed with, here are the changes for the listed substances:
Water with NaCl: -3.72 °CWater with CaCl2: -5.58 °C Water with C12H22O11 (Sucrose): -0.68 °C Pure water: No changesBased on this, the one that has the greatest freezing point depression is CaCl2.
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DIFFERENCE BETWEEN LOWEST AND HIGHEST MELTING POINT OOF CARBON FIBRE
Answer:
The carbon fiber itself will withstand incredibly high temps. The weak point will be the epoxies or the resins.Ambient-cured epoxies will typically begin breaking down around 100 °C. The heat-cured epoxies that will go up to around 300 °C. As you get into the high temp ratings, the epoxies get trickier to handle, install, cure.Since the compositions of most irons while casting are around the eutectic point (lowest liquid point) of the iron–carbon system, the melting temperatures usually range from 1,150 to 1,200 °C.As is evident, at such high temperatures, the epoxies of Carbon Fibers will melt. So, they are not yet used for iron casting.
A reaction between
a
base and an ammonium salt
Answer:
here's your answer..
Explanation:
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Which phenomenon best explains the miscibility of heptane (CH3CH2CH2CH2CH2CH2CH3) in pentane (CH3CH2CH2CH2CH3)
The phenomenon that best explains the miscibility of heptane in pentane is that both are non-polar compounds.
Solubility of compoundsSolubility is defined as the ability of a solute or substance to dissolve in a given solvent and at a particular temperature.
Heptane is a straight-chain alkane hydrocarbon that contains 7 carbon atoms. It is a non polar solvent.
Pentane is also a straight-chain alkane hydrocarbon that contains 5 carbon atoms. It is also a non- polar solvent.
Both pentane and heptane are non-polar because the atoms in their molecules share electrons equally. They are able to dissolve each other because they are alike.
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An electrochemical cell is based on these two half-reactions and their given standard reduction potential values:
Ox: Sn(s)→Sn2+(aq,1.60molL−1)+2e−E∘anode=−0.14(V)
Red: ClO2(g,0.220bar)+e−→ClO−2(aq,1.60molL−1)E∘cathode=0.95(V)
Compute the cell potential at 25 ∘C .
The potential of the electrochemical cell is 0.03 V.
What is an electrochemical cell?An electrochemical cell is a cell that produces chemical energy from a spontaneous chemical process. Let us recall that cell potential can be obtained from; Ecell = 0.0592/n log K
The cell equation is;
Sn(s) + ClO2(g) ----> Sn^2+(aq) + ClO^2-(aq)
Hence;
K = (1.60) (1.60)/(0.220)
K = 11.6
Therefore;
Ecell = 0.0592/2 log (11.6)
= 0.03 V
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Which of the following does NOT influences climate change?
Which of the following does NOT influences climate change?
All of these have an effect on climate change
Planting trees
Burning greenhouse gases
driving cars
Answer:
Driving cars
Explanation:
Because driving cars won't effect climate change
What is cartination in terms of Chemistry
Answer:
did you mean catenation? catenation is the process of bonding of the atoms of same element into a ring of series called a chain.
How many significant figures are in the measured value 69.380
Answer:
4
Explanation:
Significant figures (also known as the significant digits, precision or resolution) of a number in positional notation are digits in the number that are reliable and absolutely necessary to indicate the quantity of something.
Significant numebrs: 69.38
We don't need the extra zero!
Answer:
There are 5 significant figures in 69.380.
Explanation:
The "0" in the thousandths, which is a trailing zero, is significant because it is part of the measurement value.
When light bounces we call it?
Answer:
when light bounched we call it, reflection
Write balanced equations for the reactions that occur when Glucose (C6H12O6) reacts with oxygen gas to produce gaseous carbon dioxide and
water vapour.
C6H12O6 + 6O2 ==> 6CO2 + 6H2O
kind of out of topic:
oxygen is usually represented as O2 since its diatomic
Ionic Bonding - Problems
Which of the following could NOT form an ionic compound?
Check all that apply.
Lit and CI-
F- and O2-
Ba2+ and Ag
Mg2+ and S2
Answer:
F- and O2-
Mg2+ and S2
Explanation:
Ionic compounds compose of a metal and a nonmetal. They also compose of a cation(positively charged) and anion(negatively charged). Fluorine and Oxygen are both nonmetals and negatively charged. Barium and silver are both positively charged metals.
Mrs. Allex kicks a beach ball. What is the action? What is the reaction?
Answer:
The action is acceleration and the reaction is friction
PLEASE HELP ASAP!
What is the volume of 0.4 MH2SO4 is required to neutralize 29 mL od 0.26 M NaOH?
H2SO4(aq)+2NaOH(aq) --> Na2So4(aq)+2H2O(l)
Only answers:
54 ml
29ml
16ml
2.1ml
8.0ml
V1M1c1 = V2M2c2
29 x 0.26 x 1 = V2 x 0.4 x 2
V2 = 9.425
A secondary step in the process to produce ultra-pure silicon is to combine silicon tetrachloride with magnesium. How many grams of Si could be produced by reacting 2.00 kg of SiCl4 with excess Mg
The mass of silicon, Si produced from the reaction is 329.41 g
Balanced equationSiCl₄ + 2Mg —> 2MgCl₂ + Si
Molar mass of SiCl₄ = 28 + (35.5×4) = 170 g/mol
Mass of SiCl₄ from the balanced equation = 1 × 170 = 170 g
Molar mass of Si = 28 g/mol
Mass of Si from the balanced equation = 1 × 28 = 28 g
From the balanced equation above,
170 g of SiCl₄ reacted to produce 28 g of Si.
How to determine the mass of Si producedFrom the balanced equation above,
170 g of SiCl₄ reacted to produce 28 g of Si.
Therefore,
2 Kg (i.e 2000 g) of SiCl₄ will react to produce = (2000 × 28) / 170 = 329.41 g of Si
Thus, 329.41 g of Si were obtained from the reaction
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can ubguys help me to answer it
Are any of these equations redox reactions? if so what are their reducing and oxidizing agents?
7O2(g)+2CH3CH3(g)→4CO2(g)+6H2O(g)
HSO-4(aq)+OH-(aq)→SO42-(aq)+H2O(l)
Fe(s)+CuSO4→FeSO4(aq)+Cu(s)
Yes, Fe(s)+CuSO4→FeSO4(aq)+Cu(s) is a redox reaction. The reducing agent is Fe(s), while the oxidizing agent is CuSO4.
Oxidation-reduction reaction (redox)Oxidation-reduction reaction is the type of reaction in which electrons are transferred from one element to another. A compound or an element either gains are looses an electron in redox reactions.
Fe(s)+CuSO4→FeSO4(aq)+Cu(s)
From the equation above, Fe(s) is the reducing agent because it gives away 2 electrons and undergoes oxidation reaction.
From the equation above, CuSO4 is an oxidizing agent because it gives oxygen to Fe(s) and undergoes a reduction reaction.
Therefore, the reducing agent is Fe(s), while the oxidizing agent is CuSO4.
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How many moles of NaCL are present in 600mL of a 1.55 M NaCL solution?
Answer:
1000 ml - 1.55M 600 ml - x X 600*1.55/1000=0.93 M
PLEASE HELP!!
Some organisms are able to carry out both cellular respiration and fermentation. Which process do you think is used more often?
