Answer:
Indeed it is B, you are correct! :3
Explanation:
:3
Answer:
B. Drying paint
Car manufacturers use UV radiation to dry the paint o the vehicle. The high reflectivity of infrared radiation helps to keep the car interior cool. It also gives advantages over convection heating.
Explanation:
Hope it helps
5 points
1. In this food pyramid, how much energy is available as the energy is
passed from one trophic level to another?
Energy pytanid
O 1%
10%
оооо
25%
O 50
Answer:
I'm purty sure it's 10% Cause that is what my teach said.
Explanation:
Have a good day fern!!!!
79.2 L of a gas are contained at STP. How many moles are present in the container?
Answer:
3.54 mol
Explanation:
When at STP (Pressure of 1 atm & T of 273.16 K), one mol of any given gas occupies 22.4 liters.
With the above information in mind we can calculate the number of moles, using the factor 22.4 L/mol:
79.2 L ÷ 22.4 L/mol = 3.54 mol
There are 3.54 moles of the gas present in the container.
Can someone please solve this????? It's true or false
Answer:
True true false true true true flase, false
Explanation:
How Many moles of oxygen(02) are needed to produce 4.6 g of nitrogen monoxide (NO)?
3.36 mol
0.768 mol
0.233 mol
0.192 mol
Answer: .768
Explanation:
I didn’t get this one right but that’s the answer.
Why was plastic first invented? How is plastic bad for the environment?
Answer: The first plastic based on a synthetic polymer was invented in 1907. Plastic sticks around in the environment for ages, threatening wildlife and spreading toxins.
Determine the mass in grams of 3.45 x 10^2 mol Co.
Answer:
molar mass CO = 28.01 g/mol
3.45 x 10^2 x 28.01 =9.66 x 10^3 g
mass Zn = 2.45 x 10^-2 x 65.39 g/mol=1.60 g => 1.60 x 10^0
Explanation:
mark me as brainlest
One mole of cobalt weighs 58.9 grams. Hence the mass in grams of 345 moles of cobalt is 20320.5 g.
What is cobalt?Cobalt is 27th element in periodic table. It is place in d- block of periodic table and is termed as transition metal. Transition metals sows variable oxidation states.
The atomic number of cobalt is 27. Thus, it contains 27 protons and 27 electrons. The mass number is 57. The mass of a given number of moles of an element can be calculated by multiplying its atomic mass by number of moles.
The atomic mass of cobalt = 58.9 g/mol
The mass of one mole of cobalt is 58.9 g/mol.
Thus, the mass of 345 moles of cobalt is calculated as follows:
mass of 345 moles of Co = 345 mol × 58.9 g/mol = 20320 g.
Therefore, the mass of cobalt in 345 moles is 20320 grams.
To find more on cobalt, refer here:
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What other elements does iron commonly bonds with.
☁️ Answer ☁️
annyeonghaseyo!
Your answer is:
it can bond with oxygen to form rust or iron oxide. and it can bond with carbon to form steel.
Here's another one: Iron bonds with lots of things: Oxygen (Ferric Oxide = rust),Chlorine (Ferric Chloride]), Fluorine, ... , even other Iron (in aMetallic Bond or crystal).
Hope it helps.
Have a nice day hyung/noona!~ ￣▽￣❤️
PLEASEEE HELP !!!!
what physical changes might happen in the aquaponic system
the best example of unbalanced forces is?
Which statements true about the total mass of the reactants during a chemical change? (5 points)
0
his destroyed during chemical reaction,
It is less than the total mass of the produce
It is equal to the total mass of the products,
is greater than the total mass of the products
A balloon is filled at 0°C to a volume of 3.45L. The balloon then expands to 4.25L when placed in a 44°C room at a pressure of 0.97 atm. At what pressure was the balloon originally?
Answer:
1.0 atm
Explanation:
Step 1: Given data
Initial pressure (P₁): ?Initial volume (V₁): 3.45 LInitial temperature (T₁): 0°CFinal pressure (P₂): 0.97 atmFinal volume (V₂): 4.25 LFinal temperature (T₂): 44°CStep 2: Convert the temperatures to the Kelvin scale
We will use the following expression.
K = °C + 273.15
T₁: K = 0°C + 273.15 = 273 K
T₂: K = 44°C + 273.15 = 317 K
Step 3: Calculate the initial pressure of the balloon
We will use the combined gas law.
P₁ × V₁ / T₁ = P₂ × V₂ / T₂
P₁ = P₂ × V₂ × T₁ / T₂ × V₁
P₁ = 0.97 atm × 4.25 L × 273 K / 317 K × 3.45 L = 1.0 atm
Calculate the pH of a 0.187 M solution of a base that has a Kb = 5.86x10^-6
Answer:
[tex]pH=11[/tex]
Explanation:
Hello there!
In this case, since the ionization of the described base is:
[tex]base+H_2O\rightarrow OH^-+baseH^+[/tex]
Thus, the equilibrium expression in terms of the reaction extent is:
[tex]Kb=5.86x10^{-6}=\frac{x^2}{0.187-x}[/tex]
Thus, by solving for x we obtain:
[tex]5.86x10^{-6}({0.187-x})=x^2\\\\1.10x10^{-6}-5.86x10^{-6}x-x^2=0[/tex]
So the values of x are:
[tex]x_1=0.0010M\\x_2=-0.0010M[/tex]
So the feasible answer is 0.0010 M, thus we compute the pOH:
[tex]pOH=-log(0.0010M)=3[/tex]
And therefore the pH:
[tex]pH=14-pOH=14-3\\\\pH=11[/tex]
Best regards!
Which of the following is the BEST title for the concept map shown above?
A. sexual reproduction in humans
B. mitosis in humans
C. meiosis in humans
D. sex cell formation in humans
Answer:
the answer is b mitosis in humans
According to one definition, what do bases do in solution?
A. They decrease the pH.
B. They increase the [OH-].
C. They donate protons.
D. They form conjugate bases.
Answer:
B. They Increase the [OH-]
Explanation:
Have a great day! :)
Taking into account the definition of the Arrhenius theory of acids and bases, the correct answer is option B. "Bases increase the concentration of hydroxide ions [OH⁻]"
Arrhenius theory of acids and basesAn Arrhenius acid is defined as chemical substances that contain hydrogen, and that when dissolved in water produce a concentration of hydrogen ions or protons (H⁺), increasing the concentration of H⁺ in the solution.
That is, according to Arrhenius theory, an acid is a substance that dissociates H⁺ ions in aqueous solution.
On the other hand, according to this Theory, a Arrhenius base is any substance that, when dissolved, releases hydroxyl ions (OH⁻).
SummarySo, the correct answer is option B. "Bases increase the concentration of hydroxide ions [OH⁻]"
Learn more about Arrhenius Theory:
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Which molecule does not obey the Octate rule of valence electrons .
BeCl2
FeCl2
CuCl2
ZnCl2
Answer:
C po Hope it helps salamat
100cm³of a solution of potassium hydroxide contains 0.56g of the dissolved solute. What is the molar concentration of this solution?
Answer:
[KOH] = 0.10M in KOH
Explanation:
Molar Concentration [M] = moles solute/volume solution in liters
moles KOH = 0.56g/56g/mole = 0.01mole
Volume of solution = 100cm³ = 100ml = 0.10 liter
[KOH] = 0.01 mole KOH / 0.10 liter solution = 0.10M in KOH
Please help I’ll mark you as brainliest if correct
Answer:
Explanation: Okay what do you need help with im sure i can help.
Answer:
A
Explanation:
....................'''..
If you have a balloon inside a car at noon during a hot summer day, the balloon molecules
inside will increase in pressure. (True/False)
Explain your answer.
Answer:
it decreases
Explanation:
because its false
Answer:
True
Explanation:
The pressure will increase because the heat will make the molecules move around and spread out more.
If you want I could go into more detail with the explanation.
plants, Animals, Protists and Fungi all belong to which domain?
Answer:
Eukarya
Explanation:
Organisms in the domain Eukarya keep their genetic material in a nucleus and include the plants, animals, fungi, and protists.
A chipmunk has a mass of 0.7 kg. What is its weight? (Acceleration due to gravity on Earth is 9.8 m/s2).
Answer:
W=ma
=0.7×9.8
=6.86N
....................
PLEASE GIVE BRAINLIEST
The Reaction
A+ B → C
was carried out in a constant-volume batch reactor where the following concentration measurements were recorded as a function of time:
t min 0 5 9 15 22 30 40 60
CA/mol/L 2 1.6 1.35 1.1 0.87 0.7 0.53 0.35
Required:
Determine the reactor order and the specific rate constant If you were to take more data, where would you place the points
Answer:
Explanation:
From the information given:
We can say that the rate of reaction is utilized to decide the reaction speed, and it is subject to the rate constant.
The power of concentration related to the rate equation can be said to be the order of the reaction.
For zero-order reaction: it is the reaction whose rate is free and not dependent on the reactant's concentration.
Concentration-time reaction is given as;
[tex]\mathbf{[A] = [A_o] -kt ---- (1)}[/tex]
where;
t = time
k = rate constant
A_o = initial concentration of reactant
Thus, the plot between [A] and t needs to be a straight line.
On the other hand, The First order reaction is the reaction whose rate is straightforwardly corresponding to the reactant's concentration.
Its concentration-time relation can be expressed as,
[tex]\mathbf{In([A])= In ([A_o])-kt ---- (2)}[/tex]
t = time
k = rate constant
[A_o] = initial concentration of the reactant
Then, the plot between [A] & t requires to be a straight line.
Presently, the plot between ln([A]) vs time appears to be in a straight line with the slope of the line equivalents to the rate constant (k).
hence,
slope = -k
Then;
[tex]\mathbf{k = -slope ---- (3)}[/tex]
Now; to discover the activation energy we need to utilize Arrhenius relation which is given as,
[tex]\mathbf{In(k) = In(K_o) - \dfrac{E_o}{RT} ---- (4)}[/tex]
From the above equation;
k_o = arrhenius parameter
Ea = activation energy
R = 8.314 J/mol.K
T = temperature in Kelvin
From the data given for concentration vs time;
t[min] Ca(mol/L)
0 2
5 1.6
9 1.35
15 1.1
22 0.87
30 0.7
40 0.53
60 0.35
a)
Since we can deduce the order of the reaction,
Let's assume that it is a zero-order reaction, Thus, the plot of Ca vs t can be seen in the first image attached below;
From the diagram, it is clear and obvious that it is NOT a straight line.
Thus, we conclude that this order is NOT a zero-order.
However, let also assume that order is first order,
Now, from the second diagram showing the plot of ln(Ca) vs t, we can deduce that it is a straight line which implies that it is the order of the reaction is first order.
Therefore, the equation for the first order is given as;
[tex]\mathbf{In([A]) = In ([A_o])- kt}[/tex]
Recall that: the slope of the ln(A) v/s time will result in a rate constant,
Thus, from the graph we have;
slope = -0.0289 mol/L.min and:
slope = - k
Hence;
rate constant = k = 0.0289 mol/L.min and the order = 1st order
b)
On the off chance that we need to take more data points, we will like to take the data point in the scope of 40 min to 60 min time interval, on the grounds that the significant deviation is seen there. more information focuses will imply more accuracy.
How many Hg atoms are in 1.2mol Hg?
Plz tell me how you got it
Answer:
12
Explanation:
12
During what phase of meiosis does the DNA coil into visible chromosomes?
O prophase
O anaphase
O metaphase 1
o telophase!
Answer:
prophase
During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. The chromatin coils and becomes increasingly compact, resulting in the formation of visible chromosomes.
Answer:
prophase I
Explanation:
A structure that can lessen erosion is
Answer:
A structure that can lessen erosion is a plant cover :3
Explanation:
:3
Fossilized remains of similar plant species were found in all four layers of the rock in the diagram above. Which of the following species would be MOST closely related?
A. species found in layer A and species found in layer D
B. species found in layer B and species found in layer D
C. species found in layer C and species found in layer D
D. species found in layer A and species found in layer C
Answer:
A and C
Explanation:
so D
Consider the energy diagram below.
A graph with Reaction Progression on the x axis and Energy on the y axis. A line starts low on the y axis; this section runs horizontally and is labeled A. It rises sharply to a high round peak labeled C. A dotted line continues the initial line to a higher peak Over C, labelled B, and then falls back to the original line, which continues horizontally; this section is labeled D.
Which statement best describes the diagram?
The catalyzed reaction passes through C.
The energy of the catalyst is shown by A.
The reaction pathway through B is faster.
The energy of the reactants with catalyst is at D.
The statement best describes the diagram is the catalyzed reaction passes through C. Therefore, option A is correct.
What is an energy diagram ?An energy profile is a theoretical representation of a chemical reaction or process as a single energetic pathway as the reactants are transformed into products in theoretical chemistry.
The amount of relative potential energy in each step of a reaction is depicted by an energy diagram. Reactants, transition states, and products are typically depicted on energy diagrams. It may also include intermediates and activation energy, depending on the reaction.
There are two lines on the energy level diagram. The blue line denotes ground state energy, while the red line denotes excited state energy. The horizontal axis represents orbital energy, and the vertical axis represents total system energy.
Thus, option A is correct.
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in the periodic table, helium is placed at?
a. top left corner
b. bottom right corner
c. bottom left corner
d. top right corner
Answer:
the answer is d
Explanation:
top right corner
What happens to the number of valence electrons as you move from element 1 to element 18 on the periodic table?
A.
the number of valence electrons decreases then increases in a predictable sequence
B.
the number of valence electrons increases
C.
the number of valence electrons increases then decreases in a predictable sequence
D.
the number of valence electrons decreases
Answer:
B
Explanation:
the group number is=valence electrons. element 1 is in group 1 element 18 is in group 8. 1<8
Answer:
the answer is b
Explanation:
i just know
How to prepare 0.2mol of iodine in 13gram of the solution
Answer:
Hope this helps
Explanation:
Calculate the number of moles of 67 point 2 dm3 of nitrogen gas at stp
Answer:
1 mol. = 0.169 mol He.