Answer:
I believe its Carbon
2 SO₂ + O₂ → 2 SO₃ + energy This reaction would be considered
Answer:
this is a contact process, and the energy released means it is a exothermic process
1. Mountains are most likely formed
a. when glaciers melt.
b. from earthquakes.
C. when land sinks.
d. where tectonic plates collide.
A radioactive isotope has a half-life of 10 minutes.
At the start of an experiment, the activity of a sample of this isotope was 800 counts
per second after allowing for background radiation.
Calculate how long it would be before the activity fell from 800 counts per second to
200 counts per second.
Answer: The time for activity to fell from 800 counts per second to 200 counts per second is 20 minutes
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for finding the rate constant:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{10min}=0.0693min^{-1}[/tex]
b) for activity to fell from 800 counts per second to 200 counts per second.
[tex]t=\frac{2.303}{0.0693}\log\frac{800}{200}[/tex]
[tex]t=20minutes[/tex]
The time for activity to fell from 800 counts per second to 200 counts per second is 20 minutes
When K-37 undergoes positron emission, what is the resulting atom?
A) K-37
B) K-38
C) Ar-37
D) Ar-38
Answer:
C) Ar-37
Explanation:
A positron is a positively charged electron. It has the same mass as that of an electron, but opposite charge. It is the counterpart of an electron.
The reaction involving the emission of a positron by k-37 would produce a Ar-37, which is an unstable isotope of Argon. In this emission, there must not be a particle loss or creation, the addition of the mass number and proton number on LHS must be the sane as that on RHS of the equation.
An isotope is ability of an element to exist in two or more forms with the same atomic number but different mass number.
Which is lower in the food chain a mushroom or a tree
a mushroom
Explanation:
it don't make sense because the tree is not food chain
Answer:
they are both primary producers so i would say they are at the same level, hope this helps
In a chemical equation, which symbol should be used to indicate that a substance is in solution?
(s)
(g)
оооо
(ag)
Answer: In a chemical equation, (aq) should be used to indicate that a substance is in solution.
Explanation:
The chemical reaction is represented by putting the reactants at left side of the arrow and products on the right side of the arrow. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The liquids are designated by symbol (l) and gases are designated by symbol (g).
In a chemical equation, (aq) should be used to indicate that a substance is in solution.
Answer:
D (aq)
Explanation:
On Edge
what is the molar concentration of 5% acetic acid?
Answer:Vinegar Is 5% Acetic Acid And Its Molarity Is 0.833M.
Explanation:
yes
1. Describe the pH scale. (What is the lowest value? Highest value? Neutral value? Which
end is acid? Which end is base?)
Answer:
0 being the lowist 14 being the hieist 0 is the most acidic 14 is the hieist base 7 is nutrol
Explanation:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
A first order reaction has rate constants of 4.6 x 10-2 s-1 and 8.1 x 10-2 s-1 at 0ºC and 20ºC, respectively. What is the value for the activation energy?
A.
0.566 J/mol
B.
2.5 x 10-4 J/mol
C.
2260 J/mol
D.
18,800 J/mol
E.
1.76 J/mol
Answer:
D. 18,800 J/mol
Explanation:
We need to use the Arrhenius equation to solve for this problem:
[tex]k=Ae^{\frac{-E_a}{RT}[/tex], where k is the rate constant, A is the frequency factor, [tex]E_a[/tex] is the activation energy, R is the gas constant, and T is the temperature in Kelvins.
We want to find the value of [tex]E_a[/tex], so let's plug some of the information we have into the equation. The gas constant we can use here is 8.31 J/mol-K.
At 0°C, which is 0 + 273 = 273 Kelvins, the rate constant k is [tex]4.6*10^{-2}[/tex]. So:
[tex]k=Ae^{\frac{-E_a}{RT}[/tex]
[tex]4.6*10^{-2}=Ae^{\frac{-E_a}{8.31*273}[/tex]
At 20°C, which is 20 + 273 = 293 Kelvins, the rate constant k is [tex]8.1*10^{-2}[/tex]. So:
[tex]k=Ae^{\frac{-E_a}{RT}[/tex]
[tex]8.1*10^{-2}=Ae^{\frac{-E_a}{8.31*293}[/tex]
We now have two equations and two variables to solve for. We just want to find Ea, so let's write the first equation for A in terms of Ea:
[tex]4.6*10^{-2}=Ae^{\frac{-E_a}{8.31*273}[/tex]
[tex]A=\frac{4.6*10^{-2}}{e^{\frac{-E_a}{8.31*273}} }[/tex]
Plug this in for A in the second equation:
[tex]8.1*10^{-2}=Ae^{\frac{-E_a}{8.31*293}[/tex]
[tex]8.1*10^{-2}=\frac{4.6*10^{-2}}{e^{\frac{-E_a}{8.31*273}} }e^{\frac{-E_a}{8.31*293}[/tex]
After some troublesome manipulation, the answer should come down to be approximately:
Ea = 18,800 J/mol
The answer is thus D.
Gravity does NOT * 10 points increase when the distance between two objects increases. increase when the distance between two objects decreases. increase when the mass of one object increases. increase when the mass of both objects increases.
Answer:
increase when the distance between two objects increases
Explanation:
when the objects move further apart, the gravitational pull between them becomes weaker, and so the gravity isn't as strong. all of the other options increase gravity
3 examples of electrochemical cell
Given the formula V=1/3Ah, solve for h.
Answer: h = 1/3VA
Explanation:
V = 1/3Ah
3AhV = 1
h = 1/3VA
5. What is the primary purpose of muscle?
Answer:
Any type of movement
Explanation:
All muscles are used for any way of movement in the body.
Which statements describe functions of DNA? Select three options.
Answer:
The function of DNA is to store all of the genetic information that an organism needs to develop, function, and reproduce. Essentially, it is the biological instruction manual found in each of your cells. The instructions in DNA are written in a simple alphabet that has just four letters—A, T, C, and G.
Explanation:
Answer:
It is ABD
Explanation:
A student heats up a metal and finds that its mass increases. The students says “this is because heat has been added.” Explain why this is incorrect.
HELP DUE SOON. WILL GIVE BRAINLIEST
Answer:
The increase in mass is not due to the heating but due to the reaction of the metal with oxygen in air to form an oxide
Explanation:
When a metal is heated in the presence of air, oxygen present in air reacts with the metal to form the oxide of the metal. The mass of this oxide is greater than the original metal by the amount of oxygen added to the metal during the reaction.
The above reaction is known as an oxidation reaction. Generally,
metal M + O2 ---> MO2
Name 5 descriptions of a key including mass
Answer:
I'm assuming you're talking about something like a regular housekey, in which case there are numerous things you can describe!
Its mass: how much it weighs, times the gravity of the system.
Its color: is it silver-colored, or gold, etc.?
Its volume: you could probably calculate this, though it would be hard because it's not a traditional shape, I assume.
Its density: this is mass/volume. It means how many of the atoms are in a given space; how tightly packed the atoms are.
Its tendency to rust / its specific combination of metals or alloys: is it made of copper, tin, steel.. and these are all things that can rust to varying degrees.
What is the name of MnO? Explain how you determined the bond type and the steps you used to determine the naming convention for the compound.
Answer:
Magnesiumoxide
Explanation:
I don't know
Identify the base in the reaction (CH3)3N(aq) + HCl(aq) → (CH3)3NH+(aq) + Cl−(aq) 1. (CH3)3NH+(aq) 2. Cl−(aq) 3. (CH3)3N(aq) 4. HCl(aq)
Answer:
(CH3)3N(aq)
Explanation:
We have to think of the definition of acid and base in the sense of Brownstead-Lowry. The Brønsted–Lowry theory is an acid–base reaction theory which was proposed independently by Johannes Nicolaus Brønsted and Thomas Martin Lowry in 1923.
A Bronsted-Lowry acid is a chemical species that donates one or more hydrogen ions in a reaction. In contrast, a Bronsted-Lowry base accepts hydrogen ions. When it donates its proton, the acid becomes its conjugate base. A more general approach to the theory is viewing an acid as a proton donor and a base as a proton acceptor.
If we look at the reaction closely, we can see that (CH3)3N(aq) accepted a proton. According to the definition above, we will have to classify (CH3)3N(aq) as a base. Hence the answer.
how do meteror showers happen
Answer:
A meteor shower happens when Earth passes through the path of a comet. When this happens, the bits of comet debris, most no larger than a grain of sand, create streaks of light in the night sky as they burn up in Earth's atmosphere. Bits of debris which enter Earth's atmosphere are called meteors.
Which element will reduce Mg2+ to Mg?
a) Fe b) Ba c) Pb d) Ag
Answer:
Ba
Explanation:
Let us consider the electrode potential of one of the options listed in the question,
Ba2+(aq) + 2 e- -----> Ba(s). -2.90V
It is very important to recall that a metal can only displace another metal from aqueous solution if that metal has a more negative reduction potential that the metal it displaced. This implies that if there are two metals A and B, A can only displace B from an aqueous solution of B if A has a more negative reduction potential than B.
The reduction potential of Mg^2+ is -2.37V. This is less negative than that of Ba^2+ which is -2.90V. Hence barium can reduce Mg^2+ to metallic Mg.
In the equation E = mc2, E stands for___
m stands for___
and c stands for___
Answer energy,mass,speed of light
Explanation:
Edge
Answer
energy, mass, speed of light
Explanation:
Edge2020
what would be the final volume when 2.20 M solution is made from 25.0 mL of a 12.0 M solution? plzz show work
Answer:
136.36 mL
Explanation:
Here we have to use the dilution formula
From C1V1= C2V2
Where;
C1= initial concentration of the solution= 12.0 M
C2= final concentration of the solution= 2.20 M
V1 = initial volume of the solution= 25.0 ml
V2= final volume of the solution= ?????
Then recall;
C1V1=C2V2
V2 = C1V1/C2
Substituting values from the parameters given;
V2= 12.0 × 25.0 / 2.20
V2= 136.36 mL
Convert 7 mol carbon to grams.
Answer:
84.07grams of carbon in 7 mole of carbon.
Explanation:
7 mol×12.01g/1mol
=84.07g
Calculate the temperature of a 0.50 mol sample of a gas at 0.987 atm and a volume of 12 L.
-7 C
11 C
15.5 C
288 C
Answer: [tex]15.5^0C[/tex]
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 0.987 atm
V = Volume of gas = 12 L
n = number of moles = 0.50
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature = ?
[tex]T=\frac{PV}{nR}[/tex]
[tex]T=\frac{0.987atm\times 12L}{0.0820 L atm/K mol\times 0.50mol}=288.5K=(288.5-273)^0C=15.5^0C[/tex]
Thus the temperature of a 0.50 mol sample of a gas at 0.987 atm and a volume of 12 L is [tex]15.5^0C[/tex]
Which of these is an Arrhenius base?
A. LiOH
B. NH3
C. H2PO4-
D. CH3COOH
Answer:
LiOH
Explanation:
Among the following LiOH or lithium hydroxide is a Arrhenius base as it increase hydroxide ion concentration of a substrate.
What is a base?
According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
Learn more about base,here:
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for ever action forces there is (n) _ forces
Answer:
equal and opposite reaction
Explanation:
for ever action forces there is a equal and opposite forces
so every interaction theres theres a pair of forces acting on each other
this is newtons 3rd law
pls mark me brainliest
What is the number of moles of solute in 250 mL of a 0.4 M solution?
Answer:
0,1 mol
Explanation:
We know that the formula of concentration is C= moles of solute/ volume
0,4 M= moles of solute/ 250 mL
Convert mL to L 250 mL =0,25 L
0,4 M x 0,25 L= moles of solute
0,1 moles= moles of solute
why was the hand cream used as a separating agent when the flubber was handled
Answer:
Because you don't want 2 different things mixing together unless their supposed to be mixed together
Explanation:
The hand cream used as a separating agent when the flubber was handled because it is not about 2 different things mixing together unless their supposed to be mixed together.
What is separating agent ?
In chemical separation processes, A separating agent is the heat work added to facilitate the separation of two chemical species. It is contrasted with a mass separating agent, which is any chemical species added to the reaction that facilitates the reaction.
learn more about separating agent below,
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if 15 mol C is mixed with 10 mol O2 which reactant is the limiting reactant? Which reactant would be the excess reactant?
Answer:
C is the excess reactant.
Explanation:
Reaction is C + O2 --> CO2
1mol of C required to react with 1mol O2
Therefore 15 - 10 = 5moles of C will be in excess
What happens to electrons in ionic bonds?
Answer:
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
Hope this helps :)