Cost-effective definition: producing good results without costing a lot of money. E.g: that machine is very cost effective, it made 200 shirts with only a dollar.
Time effective definition: how well time was used. E.g that machine is very time-effective, it made 200 pants in one hour!
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Magnesium has a density of 1.74 g/cm3. What is the volume of 58.6 g of Mg?
Answer:
1 kg = 1000 g
58.6=58,600g
Explanation:
Which of the following does not change the rate of collisions between particles in a reaction?
A. Addition of catalyst
B. increase in surface area
C. increase in temperature
D. decrease in the reaction volume
Answer: C
Explanation: trust me bro
Increase in temperature does not change the rate of collisions between particles in a reaction.
What is Collision?The collision hypothesis offers suggestions for how to alter the rate of a reaction as well as an explanation for why certain reactions occur at various rates.
According to the collision theory, for a chemical reaction to take place, the reacting particles must come into contact with one another. The frequency of collisions affects the reaction's rate. According to the idea, responding particles frequently encounter without reacting.
Any analysis of an ordinary reaction mechanism must start with this rule. It explains why there are so few termolecular reactions. According to the kinetic theory of gases, there will only be one instance in which three molecules collide at once out of every 1000 binary collisions.
Therefore, Increase in temperature does not change the rate of collisions between particles in a reaction.
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The Law of Conservation of Energy states that Energy can neither be ____________ nor _____________ but only change from one __________ to another.
Answer:
Explanation:
The law of conservation of energy states that energy can neither be created nor destroyed but only changed from one form of energy to another.
The law of conservation of energy states that energy can neither be created nor destroyed but changes from one state to another.
What is law of conservation of energy?The law of conservation of energy states that energy can neither be created nor destroyed it can only be converted from one form of energy to another.According to this, the total energy of the system remains constant.
This statement is also a statement of first law of thermodynamics which is based on energy.Conservation of energy is distinct from conservation of mass as mass and energy are directly proportional which is given the equation, E=mc².
Because of law of conservation of energy the perpetual motion of machine cannot exist. This means that no system without an external source of energy can supply unlimited amount of energy to its surroundings.
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Fill in the left side of this equilibrium constant equation for the reaction of benzoic acid with water
Answer:
C6H5CO2H (aq) + H2O (l) _C6H5CO2- + H3O1. Which member of each pair is more stable? a. 2-Methyl-1-butene or 3-Methyl-1-butene b. 2-Methyl-1-butene or 2-Methyl-2-butene c. 2.3-dimethyl-1-butene or 2.3-dimethyl-2-butene
Answer:
c. 2-dimethyl-2-butene or 3-dimethyl-1-butene
40.0 g of ice cubes at 0.0°C are combined with 150. g of liquid water at 20.0°C in a coffee cup calorimeter. Calculate the final temperature reached, assuming no heat loss or gain from the surroundings. (Data: specific heat capacity of H2O(l), c = 4.18 J/g×°C; H2O(s) => H2O(l) DH = 6.02 kJ/mol)Calculate the final temperature reached, assuming no heat loss or gain from the surroundings. (Data: specific heat capacity of H2O(l), c = 4.18 J/g×°C; H2O(s) => H2O(l) DH = 6.02 kJ/mol)
The final temperature of the mixture in the coffee cup calorimeter is; 19.467 °C
According to the law of energy conservation:
As such; the heat transfer in the liquid water is equal to heat gained by the ice
Heat transfer by liquid water is therefore;
DH = m × c × DTDH = 6.02 kJ/mol) = 150 × 4.18 × (T1 - T2)6020 J/mol = 627 × (20 - T2)However, since 18g of water makes one mole
6020 J/mol = 6020/18 = 334.44 J/g.334.44 = 627 × (20 - T2)0.533 = (20 - T2)T2 = 20 - 0.533T2 = 19.467°C
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Oxidation unit test
Please help ASAP.
Which phrase best defines a redox reaction? (1 point)
O a reaction in which oxygen combines with different atoms
O a reaction in which electrons are transferred between different atoms
O a reaction in which electrons are released from the system
O a reaction in which the number of oxygen atoms is reduced
Answer:
a reaction in which electrons are transferred between different atoms
Explanation:
I took the test and got it right :)
c. a reaction in which electrons are released from the system
Oxidation:
Oxidation is a process which involves the addition of oxygen or any electronegative element or the removal of hydrogen or any electropositive element. In terms of electrons, oxidation is defined as the process in which an atom or ion loses one or more electrons.Oxidation occurs when the oxidation state of a molecule, atom or ion is increased. The opposite process is called reduction, which occurs when there is a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.Learn more:
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BaCO3 Draw the Lewis dot structure for BaCO3. Include all nonbonding electrons. Show the formal charges of all atoms. To change the symbol of an atom, double-click on the atom and enter the letter of the new atom
To draw the Lewis dot structure on the [tex]B_aCO_3[/tex] molecular it is necessary to show the electron sharing between the [tex]CO_3[/tex] molecules, and then show the ionic bond between [tex]B_a[/tex] and [tex]CO_3[/tex].
You can see how this is done in the attached image.
We can arrive at this answer because:
The Lewis dot structure is made to show the sharing or transmission of electrons between atoms.In the [tex]B_aCO_3[/tex] molecule, we have both sharing and transmission of electrons, which occurs for atoms to search for stability in their valence layers.The compound [tex]CO_3[/tex] has covalent bonds, where the electrons share the electrons so that each one is electronically stable.However, the [tex]B_a[/tex] atom needs to transmit two electrons to another molecule to achieve stability, so when it forms a bond with [tex]CO_3[/tex], it transmits two electrons to that compound.This causes [tex]CO_3[/tex] to be negatively charged, while [tex]B_a[/tex] is positively charged.Therefore, we can say that [tex]B_a[/tex] forms an ionic bond with [tex]CO_3[/tex].
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what is the common name of hydrated calcium sulphate?
Answer:
Gypsum
Explanation:
Calcium sulphate, is a naturally occurring calcium salt. It is commonly known in its dihydrate form, a white or colourless powder called gypsum.
Based on the diagram, describe the atomic structure of phosphorus. Be sure to include in your answer how many electron levels, protons, neutrons, valence electrons, and electrons are present in a neutral phosphorus atom.
What element is being oxidized in the following redox reaction?
Cr(OH)4-(aq) + ClO-(aq) → CrO42-(aq) + Cl-(aq)
Answer:
Cr
Explanation:
Cr goes from +3 to +6 and when it increases it means is being oxidized.
The element being oxidized in the redox reaction is Cr. Oxidation state helps to determine the amount of oxidation which an atom undergoes. An increase in oxidation state or number signifies oxidation has taken place.
A decrease in oxidation state depicts reduction has taken place. In this
scenario, the element Cr has a change in oxidation state from +3 to +6 which
signifies oxidation took place in the atoms of the element. This is why Cr will
be the right option.
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Which sentence best describes what happens during a change of state from
a solid to a liquid?
A. The temperature stays the same and the particle speed increases.
B. The temperature stays the same and the particle speed stays
constant
C. The temperature increases and the particle speed stays constant.
D. The temperature decreases and the particle speed decreases.
SUBMIT
Answer:
B
Explanation:
as temperature rises, the particles gain kinetic energy (they will move faster) so if temperatures stays constant, so will the movement or vibration of the particles
How is the rate of a chymotrypsin-catalyzed reaction affected by using more enzyme in the reaction mixture
The rate of a chymotrypsin-catalyzed reaction will increase by using more
enzyme in the reaction mixture.
The rate of a chemical reaction and the enzyme concentration have a direct
relationship. As concentration increases, the rate of a chemical reaction
also increases and vice versa.
In this scenario, we were told more enzyme was used in the reaction mixture
which signifies an increase in the concentration and a corresponding
increase in the rate of reaction.
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How many mL of 0.150 M HF solution are required to produce 0.0370 moles of HF
Answer:
247 ml
Explanation:
How many mL of 0.150 M HF solution are required to produce 0.0370 moles of HF 0.150 moles/ liter = 0.150/1000 moles/ml =0.000150 moles/ml
0.000150 x ? = 0.0370 moles HF
? = 0.0370/0.000150 = 247 ml
check
247 ml = 247/1000 L = 0.247
(0.247) x (0.150) =0.370 check
22. Which of the following molecules or ions contain polar bonds?
(a) O3
(b) S8
(c) 02 2-
(d) NO3
(e) CO2
(f) H2S
(g) BH4-
Answer:
D NO3 Nitrate is a nitrogen oxoanion formed by loss of a proton from nitric acid.
A 5.35 M sugar solution is diluted from 240.0 mL to 862.5 mL. What is the concentration of the dilute solution
Answer:
1.345.0
Explanation:
Hope this helpssss
Find the mass of 1.220 moles of PH5.
Answer:
43.93642
Explanation:
Phosphorus P 30.973762 1 86.0061
Hydrogen H 1.00794 5 13.9939
I don't know physics, but I hope this helps :)
(I'm a seventh grader so don't judge if this is wrong please)
Nail polish remover is something that girls just can't do without. Which of the following has been used as the active ingredient in nail polish remover?
limonene
acetone
methanol
ethanol
Answer:
Acetone has been used as the active ingredient in nail polish remover.
Which of the following is true about the actinide series?
Answer:
All of the elements are radioactive and contain the transuranium elements.
Explanation:
N/A
How to find distance from motion graph velocity - time?
Answer:
by finding the slope of tangent (y2 - y1)/(x2 - x1)
Draw the Lewis structure for C2H4 (whose skeletal structure is H2CCH2). Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. - CHONSPFBrClIXMore
Answer:
This is a picture of it hope this helps!
The Lewis structure along with bonds for ethene (C₂H₄) is drawn below-
A Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule.
The shared pairs of electrons are drawn as lines between atoms, while lone pairs of electrons are drawn as dots next to atoms.
They also display the total number of lone pairs present in each of the atoms that constitute the molecule.
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Calculate the second ionization energy of the metal M (?Hion2� in kJ/mol) using the following data:
Lattice enthalpy of MO(s), ?Hl� = -2383 kJ/mol
Bond dissociation enthalpy of O2(g) = +498 kJ/mol
First electron affinity of O = -141 kJ/mol
Second electron affinity of O = +744 kJ/mol
Enthalpy of sublimation of M = + 130 kJ/mol
First ionization energy of M = + 267 kJ/mol
Standard enthalpy of formation of MO(s), ?Hf� = -307 kJ/mol
From the information provided in the question, the second ionization energy of the metal is 578 kJ/mol.
From the question, we have the following information;
Lattice enthalpy of MO(s) = -2383 kJ/mol
Bond dissociation enthalpy of O2(g) = +498 kJ/mol
First electron affinity of O = -141 kJ/mol
Second electron affinity of O = +744 kJ/mol
First ionization energy of M = + 267 kJ/mol
Heat of sublimation of M = + 130 kJ/mol
Standard enthalpy of formation of MO(s) = -307 kJ/mol
Using Hess law of constant heat summation;
ΔHf = ΔHs + BE + ∑IE + ∑EA + U
ΔHs = Heat of sublimation of metal
ΔHf = Heat of formation MO
BE = Bond energy of O2
∑EA = sum of electron affinities of Oxygen
∑IE = Sum of the ionization energies of M
U = Lattice energy of MO
Let the second ionization energy be x
Substituting values;
(-307) = 130 + 498 + (267 + x) + 603 + (-2383)
(-307) = -885 + x
-x = -885 + 307
-x = -578
x = 578 kJ/mol
The second ionization energy of the metal is 578 kJ/mol.
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A mixture of methanol and water was distilled using both simple distillation and fractional distillation. Which statement is NOT true
With regard to distilling the mixture of methanol and water using simple
distillation and fractional distillation, a statement that can be made that is
not true is that; Methanol and water form an azeotrope.
Reasons:
Azeotrope are liquid mixtures that have the property of a constant boiling
point due to the contents of the vapor are the same as the mixture.
Water when mixed with methanol form network structures. However,
methanol does not form a binary azeotrope with water.
Therefore, a statement that is not true is that methanol and water form an
azeotrope a mixture that has a constant boiling temperature.
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Calculate the mass (in grams) of chlorine (Cl2) gas sample which occupies a 2.50 L container at a pressure of 1.22 atm and temperature of 27.8°C?
Answer:Nothing
Explanation:
The answer is nothing the tempatature isnt matched with the degrees this is false
When two volumes of hydrogen gas react with one volume of oxygen gas, two
volumes of gaseous water are formed. Modify the diagram you made for #2 to
represent molecules of hydrogen, oxygen and water in this reaction
PLEASE HELP ME!!! When two atoms combine to form a compound, one atom pulls electrons from the other atom towards itself. The atom that pulls electrons is (reduced or oxidized). The atom whose electrons are being pulled is (reduced or oxidized)?
Answer:
The pulling atom is oxidized while the pulled atom is reduced. Grade 9 Chemistry
Explanation:
Electromagnetic waves travel fastest through
A -Solid
B -Liquid
C -Gas
D-Vacuum
Answer:
Gas
Explanation:
Mechanical waves- travel faster in solids & slowest in gases
Electromagnetic waves- travel fastest in empty space and slowest in solids.
Because they are so close, than can collide very quickly, i.e. it takes less time for a molecule of the solid to 'bump' into its neighborough. Solids are packed together tighter than liquids and gases, hence sound travels fastest in solids. The distances in liquids are shorter than in gases, but longer than in solids.
Answer C- Gas
Explanation:
Electromagnetic waves- travel fastest in empty space and slowest in solids.
What is your opinion of Latino immigrants in your country?
Answer:
I believe they deserve to be here.
Explanation:
HELP ME OUT PLEASE!!
Barium sulfate, BaSO4 is a white crystalline solid that is insoluble in water. It is used by doctors to diagnose problems with the digestive system,
Barium hydroxide, Ba(OH)2 is also a white crystalline solid and is used in wastewater treatment.
How many more oxygen atoms are represented in the formula for barium sulfate than in the formula for barium hydroxide?
A) 2
B) 4
C) 1
D) 8
Answer: 2
Explanation:
Ba(OH)2 contains two oxygen atoms
BaSO4 contains four oxygen atoms.
This means that barium sulfate contains two more oxygen atoms than barium hydroxide in its formula.
Hope this helps!! :)
According to formula BaSO₄, Barium sulfate contains 2 more oxygen atom.
The correct option is (A) 2
Barium sulfate's distinguishing featureBa(OH)₂ has two oxygen atoms in it.
Four oxygen atoms may be found in BaSO₄.
This indicates that the formula of barium sulfate has two extra oxygen atoms than the formula of barium hydroxide.
Barium sulfate, often known as BaSO4, is a transparent white pigment that has a long history. It is produced by combining sulfuric acid with barium hydroxide and other sources of barium.
Chemically speaking, barium hydroxide has the formula Ba(OH)2. The monohydrate of barium, sometimes referred to as baryta or baryta-water, is one of the element's main compounds. The typical commercial form of monohydrate is this white granular substance.
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GIVING BRAINLY AND 20 POINTS
A sound wave in air has the wavelength of 1.36 m. Calculate its frequency? Assume the speed is 340 m/s.
Explanation:
frequency= velocity/ wavelength
= 340/1.36
=250