Answer:
2.5×10⁶ s
Explanation:
From the question given above, the following data were obtained:
Rate constant (K) = 2.8×10¯⁷ s¯¹
Half-life (t½) =?
The half-life of a first order reaction is given by:
Half-life (t½) = 0.693 / Rate constant (K)
t½ = 0.693 / K
With the above formula, we can obtain the half-life of the reaction as follow:
Rate constant (K) = 2.8×10¯⁷ s¯¹
Half-life (t½) =?
t½ = 0.693 / K
t½ = 0.693 / 2.8×10¯⁷
t½ = 2.5×10⁶ s
Therefore, the half-life of the reaction is 2.5×10⁶ s
Give 264.2g of (NH4)2SO4, calculate the
a) amount of (NH4)2SO4
b) number of ions
c) number of atoms
d) number of H atoms
e) number of N atoms
With workings please! Thanks so much!
Answer:
D.
Explanation:
Thank me later
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when water is added pH of the acidic solution
1 remain same
2 increases
3 decrease s
4 become zero
Answer:
the solution becomes less concentrated... meaning there is a decrease in acidity ...hence the pH slightly increases as lesser ph
means more acidity
Difference between
Atom and molecule
Answer:
Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.
Explanation:
its on safari ??????????
How many particles are in 54.5 g of aluminum? Show your work.
A. Convert the mass of aluminum to moles of aluminum. Molar mass of aluminum (Al) = 26.98 g/mol
B. Convert the moles of aluminum to particles of aluminum. There are 6.02 x 1023 particles/mol.
help please I would really appreciate
Answer:
option C
Positive terminal of the cell connected with redExplanation:
hope it may help you
Jonathan conducts an experiment to determine what solutes readily dissolve in water. He places 3 tablespoons of potting soil into one cup of water. He records his observations in 15-minute increments. After a half hour, he notices that some of the soil particles have separated and sank to the bottom. O 15 minutes 30 minutes Which term best describes the combination of soil and water?
A.Mixture
B. A solution
C. an alloy
D. an emulsion
Answer:
A. Mixture
Explanation:
Determine if the following two structures are
identical, isomers, or unrelated?
Answer:
its C........................
The following two structures are Isomers.
What are isomers and examples?
Isomers are compounds that contain exactly the same number of atoms, i.e., they have exactly the same empirical formula, but differ from each other by the way in which the atoms are arranged. Examples of isomers with the formula C8H10 are ethyl benzene, m-xylene, p-xylene, and o-xylene.
What are the 3 types of isomers?
There are three types of structural isomers: chain isomers, functional group isomers, and positional isomers.
What are isomers in biology?
Isomers are molecules with the same chemical formula but have different structures. Isomers differ in how their bonds are positioned to surrounding atoms.
Learn more about Isomers in biology at https://brainly.com/question/18474884
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Explain and describe how the photoelectric effect occurs on an atomic level in terms of protons, neutrons, and electrons
ANSWER:
Explaining the experiments on the photoelectric effect. How these experiments led to the idea if light behaving as a particle of energy called a photon.
Rob measures the solubility of three different salts in water at 22°C.
Which type of graph should he use to display his data?
Answer:
He should use a bar graph
Explanation:
Since this is a distinction between three very distinct categories a bar graph should be perfect
Explain why, when a force is applied to a piece of steel, it does not break but just
changes its shape.
Steel is a metal. Metals atoms are able to roll over each other into new positions without breaking the metallic bond. So, steel doesn't break but changes its shape.
Which of the following increases the ratio?
Both β+ and β– decay
Only β– decay
Neither β+ nor β– decay
Only β+ decay
Answer:
Only β+ decay
Explanation:
In positron emission, a proton is converted into a neutron and a positron. An anti neutrino is a particle that serves the purpose of balancing the spins.
During positron emission, the mass number to the daughter nucleus is the same as that of the parent nucleus but the atomic number of the daughter nucleus is less than that of the parent nucleus by one unit.
Positron emission increases the neutron/proton ratio.
The body's reaction to a change in the environment is called a response.
Please select the best answer from the choices provided
OT
OF
Calculate the heat energy, in kJ, needed to increase the temperature of 375g of water by 45.0°C.
Explanation:
https://socratic.org/questions/how-much-heat-kj-is-needed-to-raise-the-temperature-of-100-0-grams-of-water-from#216827
Which statements are correct regarding the Law of Conservation of Matter and Energy?
Matter or energy can create itself.
Matter or energy was created by known principles of physics and chemistry.
Matter or energy can change from one form to the other.
The law agrees with the Biblical account of Creation
(more than one answer)
Answer:
Matter or energy can change from one form to the other
Explanation:
The law of conservation of energy states that energy can neither be created nor destroyed but can only be transformed i.e. changed from one form to another. For example, mechanical energy can be changed to electrical energy.
Likewise, the law of conservation of mass/matter states that matter can not be destroyed or created but can change via physical or chemical means to conserve it. For example, matter can change from liquid state to gaseous state.
From the above two laws, it can be said that "matter or energy can change from one form to the other".
There are on average 43 g of sugar and 355 mL can of soda please calculate the molarity of sugar in the can of soda the molar mass of sugar is 342.2 g/mol
Explanation:
Given :
Amount of solute - sucrose (C12H22O11) = 41 g
Amount of solvent -soda = 355-mL
Molarity of the solution with respect to sucrose= ?
Molarity(M) is a unit of concentration measuring the number of moles of a solute per liter of solution. The SI unit of molarity is mol/L.
Formula to find the molarity of solution :
Molarity =
Amount of solvent is given in mL, let’s convert to L :
1 L = 1000 mL
Therefore, 355 mL in L will be :
= 0.355 L
We have the amount of solute in g, let’s calculate the number of moles first :
Number of moles (n) =
Molar mass of C12H22O11 = 342.29 g/mol.
Therefore, n =
= 0.119 moles.
PLEASE HELP!!!
The options are:
A. Nitrogen.
B. Neon.
C. Hydrogen chloride.
D. Sulfur dioxide.
Answer:
Hydrogen Chloride
Explanation:
They will be able to dissolve quicker than the rest
Answer:
C. Hydrogen chloride.
Explanation:
Hydrogen chloride gas will diffuse most quickly.
Hope it is helpful....chemical symbol for an atom of lithium
Answer:
Li
Explanation:
It's on the periodic table.
What happens when phenol is treated with bromine water?
Answer:
Polyhalogen derivatives are given when Phenol is treated with bromine water, in which all the H-atoms present at the o- and p- positions are substituted by Bromine with respect to the -OH group.
hope it helps
thanku
Explanation:
EXAMPLES OF PURE SUBSTANCES
Answer: Water, tin, sulfur, sucrose, salt, and etc.
Explanation: The photo has more examples
How does chemistry affect sports?
State the optimum pH for sucrase activity and describe how sucrase activity changes at more acidic and more alkaline pH values.
Answer:
Explanation:
The rather high specific activity of intracellular sucrase towards sucrose is known to be optimal at pH 6.0 and at a temperature of about 30°C. And thus, we can say that the optimum pH for sucrase activity is exactly at 6. Also, it's behaviour is said to be decreasing with increasing acidic and increasing alkallinic values.
32. Calculate the pH of a solution at 1.00 x 10- MIH") and identify the substance as an acid or base,
Answer:
[tex]{ \boxed{ \tt{formular : pH = - log[H {}^{ + } ]}}} \\ pH = - log(1.00 \times {10}^{-6} ) = 6: it's an acid\\ since \: we \: lack \: the \: exponent, \: this \: question \: is \: unsolvable \\ { \green{ \bf{take \: note}}} :{ \tt{pH \: below \: 7 \: that \: is \: { \red{acidic}}. \: \: pH \: greater \: than \: 7 \: is \: { \red {basic}}}}[/tex]
The answer to this question is D as it says in the answer sheet of the question paper but how?
Answer:
D
Explanation:
Because of their complementary nature, the oxidation and reduction processes together are referred to as redox reactions. The reactant that brings about the oxidation is called the oxidizing agent, and that reagent is itself reduced by the reducing agent. Examples are, mercury(II) oxide, oxygen, and the copper(II) ion are oxidizing agents, and carbon, hydrazine, and zinc are the reducing agents.
Answer:D
Explanation:Because of their complementary nature, the oxidation and reduction processes together are referred to as redox reactions. The reactant that brings about the oxidation is called the oxidizing agent, and that reagent is itself reduced by the reducing agent. Examples are, mercury(II) oxide, oxygen, and the copper(II) ion are oxidizing agents, and carbon, hydrazine, and zinc are the reducing agents.
8. In a chemical reaction, if the reactants are heated, the reaction usually
happens a) Faster
b) Slower
c) At the same rate
the reaction usually happens faster
¿QUE DATO DE LA CONFIGURACIÓN ELECTRÓNICA TE PERMITE UBICAR LOS ELEMENTOS QUÍMICOS EN LA TABLA PERIÓDICA?
The question is: WHAT DATA OF THE ELECTRONIC CONFIGURATION ALLOWS YOU TO LOCATE THE CHEMICAL ELEMENTS IN THE PERIODIC TABLE?
Explanation:
Elements which have same number of valence electrons tend to show similar chemical properties due to which they are placed in the same group.
Hence, electronic configuration of an element tells us the number of valence electrons present in an element. As a result, it becomes easy to locate the element in its respective group.
I need help finding out what this is please help
Answer:
search the Lewis dot structure you will know the answer.
a sample of gas measures 5 liters at 1 atm. to change the volume to a 3.5 liters at constant temperature what pressure must be applied
Answer:
0.7atm
Explanation:
3.5/5 because constant temperature
Which question would most likely be studied by a physicist?
A.
Were there ever any living organisms on Mars?
B.
Should the government spend taxpayers' money to send space probes to Mars?
C.
How can the forces on a space probe be controlled so it will land on Mars?
D.
What type of substances make up the soil on Mars?
Answer:
C.
Explanation:
Physicists main field of study is physics. This includes everything from force, matter, energy, and even time among other things. Therefore, from the questions provided the one that would most likely be studied by a physicist would be How can the forces on a space probe be controlled so it will land on Mars? This is because this question deals with forces acting on an object, regardless of what the object is Force is a huge part of physics and therefore studied by Physicists.
Subtract to find the temperature changes
for the water and the metal.
Answer:
???what metal????????????
Increasing the concentration increases the speed of reaction by... increasing the number of collisions between products increasing the amount of energy in the system increasing the number of collisions between reactants lowering the activation energy of the reaction
Answer: increasing the number of collisions between reactants
Explanation:
A reaction is possible due to collisions between the reactants to create products. If we increase the concentration of reactants then that means that we are increasing the molecules of the reactants which would give them more chances to collide and make products.
For instance, using a non-chemistry example, if there are few cars in a large city, the accidents there will be less because the cars will have such space that they wouldn't collide with each other. If the number of cars in the city is increased however, there is now less space and more chances for cars to collide.