Discovering the effect of caffeine on heart rate. The Independent Variable is caffeine, dependent Variable is heart beat, Control is group given no caffeine and constant is same amount of caffeine.
What is Independent variable?Independent variable is defined as varible which is changed by the experimenter.
What is Dependent Variable?Dependent variable is defined as those variable which depends on the independent variable.
What is Control group?It is defined as that group which do not receive experimental treatment.
What is Constant Variable?It is that variable which is kept unchanged for all types of groups in the experiment.
Thus, we concluded that the the Independent Variable is caffeine, dependent Variable is heart beat, Control is group given no caffeine and constant is same amount of caffeine.
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ph is defined as the negative log10 of the hydrogen ion activity, ah , although general chemistry texts commonly express it in terms of the hydronium ion concentration. thus, ph
pH is defined as the negative log10 of the hydrogen ion activity, although general chemistry texts commonly express it in terms of the hydronium ion the pH is calculated as 3.23.
What is pH?In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. Historically, pH stood for "potential of hydrogen."
The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
It is provided that,
{H3O+} = 5.79 X 10^-4M
We know that pH is basically the negative log10 of the hydrogen ion.
this means,
Thus, pH = -log10[H3O+]
Then putting the value of [H3O+]
pH = -log10 (5.39 x 10^-4)
pH = 3.23
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Complete question
PH is defined as the negative log10 of the hydrogen ion activity, aH+, although general chemistry texts commonly express it in terms of the hydronium ion concentration. Thus, pH = −log10 [H3O+], where [H3O+] represents the concentration of H3O+ in units of moles per liter (M). Calculate the pH or [H3O+], as required, for the following solutions. {H3O+} = 5.79 X 10^-4M
Why are the fabrication processes applied to plastics, ceramics, and composites often different from those applied to metals? what are some of the key differences?
the rate constant for the decomposition of acetaldehyde, ch3cho, to methane, ch4, and carbon monoxide, co, in the gas phase is 1.10 × 10−2 m −1 s−1 at 703.7 k and 4.90 x 10-2 m−1 s−1 at 865 k. determine the activation energy for this decomposition. give your answer in kilojoules per mole and use 3 sig figs in your answer.
The rate constant for the decomposition of acetaldehyde, CH₃CHO, to methane, CH₄, and carbon monoxide, CO, in the gas phase is 1.10 × 10² m⁻¹ s⁻¹ at 703.7 k and 4.90 x 10⁻² m⁻¹ s⁻¹ at 865 k.The activation energy for this decomposition in KJ/mole is 154.303
To determine the activation energy of a reaction (Ea) from two reaction rates (k₁ and k₂) at two different temperatures (T₁ and T₂).
we use the equation -
k₂ = Eₐ x ( 1 - 1 )
k₁ R T₁ T₂
Where,
R is the gas constant (8.3145 J/mol.K).
We have -
k₁= 1.10 x 10⁻² m⁻¹ s⁻¹
T₁= 703.7 K
k₂= 4.90 x 10⁻² m⁻¹ s⁻¹
T₂= 865 K
Putting the values in the equation -
4.90 x 10⁻² m⁻¹ s¹ = Ea x ( 1 - 1 )
1.10 x 10⁻² m⁻¹ s⁻¹ (8.3145 J/K.mol) 703.7 K 865 K
Ea = (4.90 x 10⁻² m⁻¹ s⁻¹) / ( 1 - 1 ) x (8.3145 J/K.mol)
1.10 x 10⁻² m⁻¹ s⁻¹ 703.7 K 851 K
Ea = 154303 J/mol
When divided by 1000,
Ea in KJ/mol = 154.303 KJ/mol
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PLEASE HELP ASAP!! GIVING BRAINLIEST!!
1. I believe the answer to the first one is K and K+ are the bigger atom.
2. So I believe Strontium looses 2 electrons
What is the atmosphere?
Answer:
The atmosphere is the layer of gases surrounding a planet or other celestial body.
Explanation:
Hope this helps:)
Postsynaptic currents produced by ampa glutamate receptors are _______ than those produced by other ionotropic glutamate receptors.
Container "a" holds n2 gas with a mass of 69.8 g and is 4.9 times the volume of container "b" which holds argon (ar) gas at the exact same temperature and pressure. what is the mass of the ar (in g) within container "b"?
By ideal gas approximation, the mass of the Argon gas in container "b" is 488.6 grams.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
Molar mass N₂ = Mr N₂ = 28
Molar mass Ar = Mr Ar = 40
m1 = 69.8 gr
V1 = 4.9 V2
P1 = P2 = P
T1 = T2 = T
Approximate that the gas is ideal, hence the ratio is
P1 . V1 / (n1 . R . T1) = P2 . V2 / (n2 . R . T2)
P . V1 / (m1/MrN₂ . R . T) = P . 4.9V1 / (m2/MrAr . R . T)
Mr N₂ / 69.8 = 4.9 . MrAr / m2
28 / 69.8 = 4.9 . 40 / m2
m2 = 488.6 grams
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Sodium phosphate reacts with sulfuric acid to form sodium sulfate and phosphoric acid. What is the stoichiometric coefficient for sulfuric acid when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?.
When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.
In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.
The chemical equation for the given reaction is:
[tex]Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Put the necessary stoichiometric coefficient to balance each element.
Balancing Na:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Balancing P:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Balancing S:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Notice that H and O are already balanced.
Hence, the balanced chemical equation for the reaction is:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
where 3 is the stoichiometric coefficient of sulfuric acid, [tex]H_{2} SO_{4}[/tex].
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is granola a homogeneous or heterogeneous mixture??
Granola is a heterogeneous mixture.
Heterogeneous mixture is a mixture that does not resemble the uniform mixture and the mixture appears non-uniform.
Granola is a heterogeneous mixture in which Oats, nuts, honey, or other sweetener including brown sugar are commonly incorporated to make granola, that is then typically roasted until it is crunchy, toasted, and golden brown. Periodically, raisins will be added.
Since, different individual could be seen hence it is a heterogeneous mixture.
Hence, Granola is a heterogeneous mixture.
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The particles of a gas inside a balloon are experiencing an increase in their average kinetic energy and the number of collisions with the wall of the balloon. What is the most likely outcome?
calculate the molar concentration of a 3.0% mass percent concentration of h2o2. you can assume the density of the solution is 1.00 g/ml. (hint: start with 1.00 kg of solution)
The molar concentration of 3.0% mass percent concentration of H₂O₂ is 0.88 MOL/L
Explanation:
From the given problem:
Concentration of H₂O₂ = 3.0%
Volume = 1.00 ml
Density of solution = 1.00 g/ml
Here it is given that, In 3.0% H₂O₂ , the solution contain 30g H₂O₂ per 1000g of solution.
To find the molecular weight of H₂O₂, we have to do this calculation to get the molecular weight of H₂O₂= 2(mass of hydrogen) + 2(mass of oxygen) = 2×1 + 2×16
Since the molecular weight of H₂O₂ =34 g/MOL.
then 30g would be (Mass/ MOL. wt)
= (30g)/(34g/MOL.)
=0.88 MOL.
So the solution would be 0.88 MOL/L
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Explain or show how you could calculate the mass of an object if you know its volume and density.
Answer:
yea I'm also looking for this question to .
Johnny calculates from an experiment that he has 22.7 g of carbon. However, he should have gotten 21.8 g of carbon which was the actual value for this experiment. Calculate Johnny's percent error and round to the hundreths place.
Johnny's percentage error is calculated as= 41%
Calculation of percentage errorThe quantity of carbon Johnny should have (actual value) = 21.8 g
The quantity of carbon Johnny was able to calculate = 22.7 g
To calculate the percentage error, subtract the actual value from the estimated value. That is,
22.7 - 21.8 g = 0.9 g
This error value obtained is divided by the actual value ( 21.8 g)
0.9 / 21.8 = 0.41
Then multiply by 100%
0.41 × 100.= 41%
Therefore, Johnny's percentage error is calculated as = 41 %
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Calculate the mass (mg) of a cube of palladium of edge length 0.055 mm given that the density of palladium
is 12.02 g/cm³
The mass (in mg) of the cube of palladium of edge length 0.055 mm is 0.002 mg
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
With the above formula, we can obtain the mass of the palladium. Details below
How to determine the mass of the silverEdge length (L) = 0.055 mm = 0.055 / 10 = 0.0055 cmDensity of palladium = 12.02 g/cm³Volume of palladium = L³ = 0.0055³ = 1.66×10⁻⁷ cm³Mass of palladium =?Density = mass / volume
Cross multiply
Mass = Density × Volume
Mass of palladium = 12.02 × 1.66×10⁻⁷
Mass of palladium = 2.0×10⁻⁶ g
Multiply by 1000 to express in milligram (mg)
Mass of palladium = 2.0×10⁻⁶ × 1000
Mass of palladium = 0.002 mg
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Describe how to find out the number of valence electrons for elements in groups 1 & 2 and 13-18.
The valence electrons for elements is the number of electrons in their outermost shells.
How to calculate valence electrons in atomsThe valence electrons of atoms of elements are the number of electrons in the outermost shell of the atoms.
The innermost shell of every atom can take a maximum of 2 electrons. Thereafter, all other shells are able to take a maximum of 8 electrons. If the last shell of an atom is not completely filled, the number of electrons on the shell is equivalent to the valence electrons.
For every neutral atom, the number of valence electrons is equivalent to the group the atom belongs to on the periodic table.
Thus, group 1 elements have 1 valence electron, group two elements have 2 valence electrons, and so on.
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What have scientists learned about the cuttlefish through observation?
Answer:
Explanation: Cuttlefish are often called the chameleons of the ocean; this is due to their striking ability to change color for a variety of reasons. ... Cuttlefish have been recognized as changing color to camouflage themselves from, or to warn off predators, and to interact with other cuttlefish.
One type of neon has 10 neutrons, while other types have 11 neutrons and 12 neutrons. which term best defines the different types of neon atoms in nature?
One type of neon has 10 neutrons, while other types have 11 neutrons and 12 neutrons. The term best defines the different types of neon atoms in nature is known as Isotopes.
Isotopes are atoms of the similar element that have indifferent numbers of neutrons but the equal number of proton and electrons.
The different in the neutrons results the same element with different masses.
Neon is a chemical element. Its symbol is denoted by Ne.
It is called as Nobel gas and the most stable element.
If talking about the properties it is odorless , uncolored, monoatomic, chemically inactive.
Also called as inert gas.
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Answer: isotopes
Explanation:
i took the test
Pls hurry and tell the answer.
Is it a, b, c, d
Answer:
D
Explanation:
I have a crush on the same and I
Which of the following is NOT part of Dalton's Atomic Theory?
1. Atoms are composed of tiny subatomic particles.
2. Atoms that combine do so in simple, whole-number ratios.
3. All elements are composed of atoms.
4. Atoms of the same element are identical.
Answer: The statement that theatoms are made up of protons, neutrons, and electrons is not a part of Dalton's atomic theory. Therefore, option c is correct.
Explanation:
Mrs. bauer wanted to investigate whether the amount of time students studied for the test would affect their grade on final. what is the independent variable in the experiment?
Answer: amt of time students studied
Explanation:
How many atoms does 2 SO₃
Answer:This formula has three types of atoms - nitrogen (N), hydrogen (H) and oxygen (O). There are a total of 4 atoms in one molecule of SO3.
After being discredited on the stand in the jackson case, what did gettler do? (poisoner's handbook video notes)
After losing credibility throughout the jackson case trial. To show that only the body is failing, Gettler underwent a number of cyanide tests.
He identified cyanide poisoning as the cause of death using chemical analyses.
What are the forensic test had been done by Gettler ?He examined techniques for identifying human body decomposition by wood alcohol.
He identified cyanide poisoning as the cause of death using chemical analyses.
When arsenic was utilized as a toxin, the Marsh test, a very sensitive method for finding arsenic, is particularly helpful in the field of forensic toxicology. James Marsh, a chemist, created it, and it was first printed in 1836.
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Blue ink from two different pens appears to be the exact same color. Explain how
to determine whether the inks are identical.
A paper ink chromatogram can also be used to detect compounds by comparing them to already identified substances. If two substances create the same number of dots that match in color, they are most likely the same.
The spots travel up the page the same distance (have the same R f value). A paper chromatogram can also be used to detect compounds by comparing them to already identified substances. If two substances create the same number of dots that match in color, they are most likely the same. Thus, ink is a mixture since it is composed of two substances: water (solute) and dye (solvent).
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How much water would be displaced if we submerged this book inside a tank of water? The book is 56cm3.
56 ml of water is displaced on submerging a book having volume of 56 cm³.
How to calculate volume of fluid displaced?If a body is considered which is completely submerged, the volume which it will displace will be equal to volume of the body.If it is partially submerged,volume of fluid displaced will be equal to the volume of the part which is submerged.This is in accordance with the Archimedes' principle.
The Archimedes' principle can be stated as the upward buoyant force which is exerted on a body irrespective whether the body is partially or fully submerged is equal to the weight of fluid which is displaced by it.
Thus,56 cm³ of water will be displaced on submerging the book into water as the book will be completely submerged.
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For each carbon bond shown, how many electrons surround each carbon atom.
A) 2
B) 4
C) 6
D) 8
in an insulated vessel, a quantity of hot water at temperature t1 is mixed with a different quantity of cold water at temperature t2 . after equilibrium is established, the vessel contains .
The correct option is (4) Water only.
After equilibrium is established, the vessel contains water only.
What is insulation?Insulation is a material that serves as a barrier between the interior of your home and the considerably variable outside temperature to decrease heat absorption or loss. Heat cannot be added or removed from the vessel since it is insulated; consequently, there is no heat exchange. If hot water and cold water are combined, the final water temperature in the equilibrium vessel will be moderate. Hot water generates the same amount of heat that cold water looses.
By limiting heat movement, insulation ensures optimal housing efficiency. Insulation is mostly used to keep the interior of your home at the proper temperature while consuming less energy.
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The complete question is:
"In an insulated vessel, a quantity of hot water at temperature T1 is mixed with a different quantity of cold water at temperature T2. After equilibrium is established, the vessel contains __________.
1. steam only
2. ice only
3. water and ice
4. water only"
What is the chemical formula for sugar?
Answer:
C12H22O11
Explanation:
The slope of the graph
What units are appropriate for the slope?
The density of a gold sample is 18.88 is it pure gold?
20 is the slope of the given graph
The density of the pure gold is 19.3g/cc. here in this figure it is given that a graph plotted against mass vs volume. the slope is calculated by
y₂-y₁/x₂-x₁ = 0.4-0.1/0.02-0.005
=20
density of the sample is so from the above given data the calculated average density we get it 19.3 which is the pure golds density.
Gold nuggets are naturally occurring pieces of gold in nature. Streams often concentrate nuggets and fine gold in placer gold. Nuggets are obtained from placer mining, but are also found in gold-bearing veins or deposits of weathered deposits.
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Compare and contrast a solution and a suspension
The difference between a solution and a suspension is in the particle sizes involved. A solution is a mixture of ions or molecules (very, very small). Solutions are transparent, meaning that you can see through them. A suspension has bigger particle sizes and so it may look cloudy or murky
the freezing point of a cyclohexane sample is 6.20 °c. a solution is prepared by dissolving 0.4660 g of anunknown solute in 36.0 g cyclohexane. the freezing point of the resulting solution is 4.11 °c.
The answer of this question is 123.87 g
Here we have to find the molar mass of unknown solvent
Given,
freezing point of cyclohexane sample =6.20°c
freezing point of resulting solution =4.11°c
Delta Temperature(Δt) = kf × molality for finding molality
Moles = grams / molar mass
Molality = moles / kg solvent
In cyclohexane, the mass of mixed solute = 0.4 × 609
Solute mixed in cyclohexane and mixed in cycloheptene= 0.4^2 × 1000 / 36 π
Del Temperature (Δt)= kf × molality
= 2.0920 × 0.4 × 1004 / 36 × 2.09
M = 9320 / 73.29
= 123.87
Molar mass of an unknown solvent = 123.87 grams
so, the answer of this problem is 123.87 g
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