Answer:
2
[tex]0.4167\ \text{M}^{-1}\text{min}^{-1}[/tex]
Explanation:
Half-life
[tex]{t_{1/2}}A=2\ \text{min}[/tex]
[tex]{t_{1/2}}B=4\ \text{min}[/tex]
Concentration
[tex]{[A]_0}_A=1.2\ \text{M}[/tex]
[tex]{[A]_0}_B=0.6\ \text{M}[/tex]
We have the relation
[tex]t_{1/2}\propto \dfrac{1}{[A]_0^{n-1}}[/tex]
So
[tex]\dfrac{{t_{1/2}}_A}{{t_{1/2}}_B}=\left(\dfrac{{[A]_0}_B}{{[A]_0}_A}\right)^{n-1}\\\Rightarrow \dfrac{2}{4}=\left(\dfrac{0.6}{1.2}\right)^{n-1}\\\Rightarrow \dfrac{1}{2}=\left(\dfrac{1}{2}\right)^{n-1}[/tex]
Comparing the exponents we get
[tex]1=n-1\\\Rightarrow n=2[/tex]
The order of the reaction is 2.
[tex]t_{1/2}=\dfrac{1}{k[A]_0^{n-1}}\\\Rightarrow k=\dfrac{1}{t_{1/2}[A]_0^{n-1}}\\\Rightarrow k=\dfrac{1}{2\times 1.2^{2-1}}\\\Rightarrow k=0.4167\ \text{M}^{-1}\text{min}^{-1}[/tex]
The rate constant is [tex]0.4167\ \text{M}^{-1}\text{min}^{-1}[/tex]
If an object is accelerating at a rate of 25 m/s2, how long (in seconds) will it take to reach a speed of 550 m/s? (Assume an initial velocity of zero.)
Answer:
22s
Explanation:
Given parameters:
Acceleration = 25m/s²
Final velocity = 550m/s
Initial velocity = 0m/s
Unknown:
Time taken = ?
Solution:
To solve this problem, we are going to use one of the motion equations:
v = u + at
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time taken
550 = 0 + 25 x t
550 = 25t
t = 22s
The formula for water is H20. What does the formula H2O tell us about the composition
of water?
Electrons are one of the three subatomic particles that make up an atom. Which of the
following describes the location of electrons?
Electrons were held even outside the nucleus, unlike protons as well as neutrons.
What is electron?Subatomic particles with an elementary charge of -1 were classified as electrons.
What is nucleus?An atom's nucleus would be its center. The protons, as well as neutrons in the nucleus, as well as neutrons in the nucleus, make up several of an atom's mass while orbiting electrons contribute only a little amount.
Electrons were held even outside the nucleus, unlike protons as well as neutrons, which have been contained within the nucleus at the heart of the atom. Negative electrons were drawn to the positive nucleus by the attraction of opposite electric charges.
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Calculate the molar mass of pentacarbon disulfide.
Answer:
[tex]MM_{C_5S_2}=132.19g/mol[/tex]
Explanation:
Hello!
In this case, since the computation of the molar mass requires the molecular formula, we first realize that of pentacarbon disulfide is C₅S₂ due to the given prefixes. In such a way, we multiply the atomic mass of carbon by five and that of sulfur by two as shown below:
[tex]MM_{C_5S_2}=5m_C+2m_S[/tex]
Thus, we plug in the atomic masses given in the periodic table to obtain:
[tex]MM_{C_5S_2}=5*12.01+2*32.07\\\\MM_{C_5S_2}=132.19g/mol[/tex]
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A jar contains 0.29 kg of olives. How many grams of olives are in the jar?
1 kilogram = 1000 grams
0.29 kg = 290 grams.
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A jar contains 0.29 kg of olives. The quantity of olives in the jar is 290 grams.
What is the conversion factor?A conversion factor may be significantly defined as a process through which a number is utilized in order to change one or specific set of units to another with the help of mathematical operations like multiplication and division.
According to the question,
The number of olives in the jar = 0.29 kg.
Now, if you want to convert this set of units into grams, you must require simple calculations:
1 kilogram = 1000 grams.
0.29 kilograms = 0.29 × 1000 = 290 grams.
Therefore, a jar contains 0.29 kg of olives. The quantity of olives in the jar is 290 grams.
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What describes the relationship between elements and compounds?
Group of answer choices
A. Carbon changes to Oxygen to form a compound
B.A few elements can combine to form a compound
C. Carbon is always a part of a compound
D. A few compounds combine to form an element
Answer:
B. A few elements can combine to form a compound
Explanation:
An element is a substance that cannot be chemically broken down into simpler substances. (THESE ARE IN THE PERIODIC TABLE OF THE ELEMENTS)A compound is a substance composed of two or more elements in fixed, definite proportions.Source: Tro Nivaldo J.. Principles of Chemistry (p. G-4). Pearson Education. Kindle Edition.
Answer:
.A few elements can combine to form a compound
Explanation:
blants, water moves in a continuous column in direction. Both One direction, down only One direction, up only Any way it wants to move
Answer:
i like one direction
Explanation:
Which is an example of a solution?
Answer: Examples:: Rubbing Alcohol, Dissolved Sugar in Water
Explanation:
A solution is a homogeneous mixture made up of two or more substances.
Rearrange this expression into quadratic form, 2++=0 , and identify the values of , , and . 0.20=^2/65−
Explanation:
0.20 equal to 2/65
2/65-0.20
-0.1692
How do index fossils help scientistsHow do index fossils help scientists?
They aid in the study of ranges of different organisms.
They advance understanding of the origin of life on Earth.
They aid in comparison of rock layers at distant locations.
They advance understanding of rock type at the time the organism lived.
Answer:
C: They aid in comparison of rock layers at distant locations.
Explanation:
Index fossils are simply fossils of organisms that existed over a wide area and for just a brief duration of time. These fossils help scientists to date rocks and even matching the layers.
Looking at the options, the correct one is Option C.
Answer:
C
Explanation:
EDGE 2022
A 25.0 g sample of nitrogen reacts with 4.02 g of hydrogen to form ammonia (NH3) in the equation N2 + 3 H2 = 2 NH3 If ammonia is the only product, what is the mass of ammonia formed?
Answer:
Mass = 22.1 g
Explanation:
Given data:
Mass of nitrogen = 25.0 g
Mass of hydrogen = 4.02 g
Mass of ammonia formed = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Number of moles of nitrogen:
Number of moles = mass/molar mass
Number of moles = 25.0 g/ 28 g/mol
Number of moles = 0.89 mol
Number of moles of nitrogen:
Number of moles = mass/molar mass
Number of moles = 4.02 g/ 2 g/mol
Number of moles =2.01 mol
now we will compare the moles of nitrogen and hydrogen with ammonia.
H₂ : NH₃
3 : 2
2.01 : 2/3×2.01 = 1.3 mol
N₂ : NH₃
1 : 2
0.89 : 2/1×0.89 = 1.78 mol
hydrogen produced less number of moles of ammonia it will act ae limiting reactant.
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 1.3 mol × 17 g/mol
Mass = 22.1 g
What type of boundary exists at letter b?
Answer:
Convergent boundaries
Explanation:
Read this excerpt from "Why Are They Called Black Holes?"
After many millions or billions of years, the star runs out of hydrogen and energy. Then the star "dies" and collapses into a dense little ball with tons of gravity. Albert Einstein’s theory of relativity predicted that black holes would have to exist if a dead star had enough gravity. Using Einstein's theory, astronomers calculated that if a star more than three times as heavy as our sun died, the force of gravity pulling matter in could overwhelm any other force pushing matter out.
In this excerpt, the author makes a connection between a scientific theory and
the calculations that scientists make.
the beginning of a star's existence.
the idea that all things live and die.
the question of why gravity exists.
Answer: the answer is c
Explanation: hope this helps you
Answer: the answer is c
Explanation: hope this helps you
If the theoretical yield of the reaction above corresponds to 99.2g and the actual yield was 60.9 g, calculate the percent yield.
Answer:
61.4 %
Explanation:
Let's consider a generic chemical reaction.
Reactants ⇒ Products
The theoretical yield is the maximum mass of product that theoretically can be obtained from the chemical reaction.
The actual yield is the mass of the product obtained from the reaction.
The percent yield is:
Percent yield = actual yield / theoretical yield × 100%
Percent yield = 60.9 g / 99.2 g × 100% = 61.4 %
True or False: Frequency is the number of wavelengths that pass by a point each second
A. True
B. False
Are you the brainliest or no?
Answer: True
Explanation: Frequency by definition is the number of waves that pass a fixed point given a certain amount of time. The shorter the wavelength, the higher the frequency.
Frequency is the number of wavelengths that pass by a point each second. Therefore, the given statement is true.
What is frequency?In physics, frequency is the amount of waves that pass a given point in a unit of time as well as the amount of cycles or vibrations that a body in periodic motion experiences in a unit of time. After moving through a sequence of situations or locations and then returning to its initial position, a body in periodic motion is thought to have experienced one cycle or one vibration.
The frequency is 2 per second if the period, as well as time interval, needed to complete 1 cycle or vibration is 1/2 second; it is 100 per hour if the duration is 1/100 of an hour. In most cases, the frequency is equal to the period, or time interval, reciprocally, therefore frequency = 1/period = 1. (time interval). Frequency is the number of wavelengths that pass by a point each second
Therefore, the given statement is true.
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The liquid 1-decanethiol is insoluble in water. If approximately equal volumes of water and 1-decanethiol were mixed in a separatory funnel, would the water layer end up on the top or on the bottom
Answer:
1-decanethiol on top layer and water on the bottom layer.
Explanation:
Hello!
In this case, since long-chained alcohols have a predominant nonpolar section in the molecule, we understand they are largely insoluble in water, also because their densities tend to be less than that of the water, which means they act as a light phase and water the heavy phase.
In such a way, when mixing equal volumes of 1-decanethiol and water in a separatory funnel, a phase splitting is evidenced and the alcohol remains on the top layer because of its lower density.
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I NEED HELP WITH #3 pleaseeee
Answer:
energy level
sub energy level
electrons in the orbital
Explanation:
How can you make an item that is made of magnetic material become a permanent magnet instead of a temporary magnet? *.
Answer:
You can heat it and then let it cool it in a very strong magnetic field.
It can be heated and then allowed to cool in a very powerful magnetic field. To make an item that is made of magnetic material become a permanent magnet instead of a temporary magnet.
What is magnetic field ?The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling through a magnetic field.
Heating a ferromagnetic material to a crucially high temperature is the primary method for producing permanent magnets. Although the temperature varies depending on the type of metal, it has the effect of aligning and "fixing" the magnet's domains in place over time.
Electric charges in motion are what generate magnetism. The smallest building blocks of matter are called atoms. Each atom contains electrons, which are tiny particles with electric charges.
Thus, It can be heated and then allowed to cool in a very powerful magnetic field.
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The recommended single dose for acetaminophen is 10.0 to 15.0 mg/kg of body weight for adults. Using this guideline, calculate the maximum single dosage for a person who weighs 153 lb .
Answer:
1.041g is the maximum sigle dose for the person
Explanation:
The maximum dose for acetaminophen is 15.0mg / kg of body weight for adults
To find the maximum single dosage for a person who weighs 153lb we must convert the lb to kg (1lb = 0.4536kg):
153lb * (0.4536kg / 1lb) = 69.4kg is the mass of the person
As the maximum dose is 15.0mg / kg, the dose of the person is:
69.4kg * (15.0mg acetaminophen / kg) =
1041mg = 1.041g is the maximum sigle dose for the personA gas has a volume of 200. mL at 350. mm Hg. What will its volume be if the pressure is changed to 555. mm Hg
Answer:
The final volume when pressure is changed is 126.1mL
Explanation:
Based on Boyle's law, in a gas the volume is inversely proportional to its pressure when temperature remains constant. The equation is:
P₁V₁ = P₂V₂
Where P is pressure and V volume of 1, intial state and 2, final state.
Computing the values of the problem:
350mmHg*200mL = 555mmHgV₂
126.1mmHg = V₂
The final volume when pressure is changed is 126.1mLKOH + HNO3 equals HOH + KNO what type of reaction is this
Answer:
Double-Replacement Reactions
Explanation:
KOH + HNO3 -> H2O + KNO3
This is a double replacement reaction
The anions are "traded" and two new compounds are produced
(a liquid and a salt)
1
Which organelle is the site of photosynthesis? *
(15 Points)
A. chloroplast
B. mitochondrion
C. nucleus
O
D. ribosome
Answer:
A. Chloroplast
Explanation:
What is the volume of 67.1g of ethyl alcohol, which has a density of 0.79 g/mL?
Answer:
[tex]84.94\ \text{mL}[/tex]
Explanation:
[tex]m[/tex] = Mass of ethyl alcohol = [tex]67.1\ \text{g}[/tex]
[tex]\rho[/tex] = Density of ethyl alcohol = [tex]0.79\ \text{g/mL}[/tex]
[tex]V[/tex] = Volume of ethyl alcohol
Density is given by
[tex]\rho=\dfrac{m}{V}\\\Rightarrow V=\dfrac{m}{\rho}\\\Rightarrow V=\dfrac{67.1}{0.79}\\\Rightarrow V=84.94\ \text{mL}[/tex]
The volume of ethyl alcohol is [tex]84.94\ \text{mL}[/tex].
Find the mass of an object that has a density of 1.5 g/cm3 and has a volume of 8cm3
Answer:
density= 1.5 g/cm3
volume= 8cm 3
mass = density×volume
mass= 1.5×8
= 12 g
The mass of an object will be "12 g". To understand the calculation check below.
Volume, Density and MassAccording to the question,
Density, d = 1.5 g/cm³
Volume, V = 8 cm³
We know the relation,
→ Mass = Density × Volume
or,
m = d × V
By substituting the values, we get
= 1.5 × 8
= 12 g
Thus the response above is correct.
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Classify these bonds as ionic, polar covalent, or covalent, and give your reasons: (a) the SiSi bond in Cl3SiSiCl3, (b) the SiCl bond in Cl3SiSiCl3, (c) the CaF bond in CaF2, (d) the NH bond in NH3.
Answer:1-1 equakls
Explanation:
Briefly explain how will you describe which object is moving fast and which one is moving slow?
10) Give two example of where you would find elements in our daily lives.
please help with this
Give the product expected when the following alcohol reacts with pyridinium chlorochromate (PCC). (Assume that PCC is present in excess.) The starting material is H O C H 2 C H 2 C H 2 O H. THis reacts with P C C and C H 2 C L 2 to give the product.
Answer:
Explanation:
From the information given, we are to show the product of the reaction between the alcohol (stick formula) with pyridinium chlorochromate. The reaction starts with the nucleophilic addition of Cr with oxygen molecule on the alcohol. Then, deprotonation of oxygen occurs, this process is followed by the removal of hydrogen ion to yield the final product. The reaction mechanism can be seen from the attached image below.
PLEASE HELP I WILL GIVE YOU BRAINLIEST Provide the chemical formula for the following
Provide the chemical name for the following
1. Calcium Dichromate
2. Na2SO3
3. Ammonium Sulfite
4. Cu(NO2)2
7.5 moles of nitrogen gas (N2) is formed in the following reaction. How many grams
of Ammonia (NH3) are formed?
3H2 + N2 + 2NH
Answer:
Mass = 255 g
Explanation:
Given data:
Number of moles of nitrogen = 7.5 mol
Mass of ammonia formed = ?
Solution:
Chemical equation:
3H₂ + N₂ → 2NH₃
Now we will compare the moles of nitrogen and ammonia.
N₂ : NH₃
1 : 2
7.5 : 2/1×7.5 = 15
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 15 mol × 17 g/mol
Mass = 255 g
