I BELIVE ITS 5 SORRY IF THATS WRONG BUT IM SURE
how many grams of potassium nitrate are required to prepare 3.00 x 10^2 mL of 0.750 M solution
Answer:
Mass = 22.725 g
Explanation:
Given data:
Mass of potassium nitrate required = ?
Volume of solution = 3.00 ×10² mL
Molarity of solution = 0.750 M
Solution:
Formula:
Molarity = number of moles of solute / L of solution
Now we will convert the volume into L.
3.00 ×10² mL × 1L /1000 mL
0.003 ×10² L or 0.3 L
now we will put the values in formula.
0.750 M = n / 0.3 L
n = 0.750 M × 0.3 L
M = mol/L
n = 0.225 mol
Mass of potassium nitrate:
Mass = number of moles × molar mass
Mass = 0.225 mol × 101 g/mol
Mass = 22.725 g
Which statement describes the relative energy of the electrons in the shells of a calcium atom?
Answer:
An electron in the first shell has more energy than an electron in the second shell.
Explanation:
Which of the following resources carries a high potential for environmental damage
A:wind
B:trees
C:geothermal
D:nuclear
Answer:
Nuclear
Explanation:
Nuclear is a un-natural and newer type of energy source that can spread lethal toxins into the air causing living things to die. On top of that is it sometimes very unstable and sometimes if it's not disposed correctly it can cause high levels of radiation.
An neutral atom of aluminum 27 contains
Answer:Find it
Explanation:
Aluminium-27 is an isotope of aluminium characterized by the fact that is has a mass number equal to
27
.
Now, an atom's mass number tells you the total number of protons and of neutrons that atom has in its nucleus. Since you're dealing with an isotope of aluminium, it follows that this atom must have the exact same number of protons in its nucleus.
The number of protons an atom has in its nucleus is given by the atomic number. A quick looks in the periodic table will show that aluminium has an atomic number equal to
13
.
This means that any atom that is an isotope of aluminium will have
13
protons in its nucleus.
Since you're dealing with a neutral atom, the number of electrons that surround the nucleus must be equal to the number of protons found in the nucleus.
Therefore, the aluminium-27 isotope will have
13
electrons surrounding its nucleus.
Finally, use the known mass number to determine how many neutrons you have
the energy of motion is called
Answer:I think it’s mechanical energy
Explanation:
F. A rigid steel cylinder has a volume of 20.0 L. It is filled with N2 gas to a final pressure of 205 atm at 27.0 S. How
many moles of N2 gas does the cylinder contain?
Answer:
don't know this but going to figure out
A neutral atom of nitrogen has electrons in energy level(s):
Select one:
O a. 1 only
O b. 2 only
O c. 1 and 2
O d. 1, 2, and 3
Answer:
c
Explanation:
Nitrogen is in period 2, and has electrons in both 1 and 2.
The electron seeks to go up to energy level n = 2 from level 1, which is the initial energy level. Since the second energy level has more energy than the first, the electron must gain energy to travel from n = 1 to n = 2. A neutral atom of nitrogen has electrons in energy levels are 1 and 2.
What is energy level ?Any discrete value from a set of total energy values for a subatomic particle constrained by a force to a finite space or for a system of such particles, such as an atom or a nucleus, is referred to as the energy level, also known as the energy state, in physics.
"Energy levels" refer to the areas around the nucleus where an atom's electrons are positioned. The 3-dimensional region around the nucleus where electrons are most likely to be is represented by an energy level.
Every component of the cycle of wellness depends on energy. Our attitude and physical health both get better as we get more energy. Connecting with people, exercising, and feeling driven to work hard and accomplish personal objectives are all more likely.
Thus, option C is correct.
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1. Alpha emission by a radium-226 nucleus
Answer:
₈₈Ra²²⁶ → ₈₆Rn²²² + ₂He⁴ + energy
Explanation:
Alpha beta and gamma radiations are the examples of ionizing radiations.
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles having two proton and two neutrons. It is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom.
For example:
₈₈Ra²²⁶ → ₈₆Rn²²² + ₂He⁴ + energy
Properties of alpha radiation:
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
Another example:
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴ + energy
Help me ASAP !!!!!!!!!!!!!!!
Answer:
l, ll, lll, v
Explanation:
I just took the test ;)
the scientefic methos is founded on
Answer:
Francis Bacon was the first to formalize the concept of a true scientific method, but he didn't do so in a vacuum. The work of Nicolaus Copernicus (1473-1543) and Galileo Galilei (1564-1642) influenced Bacon tremendously.
which group has different numbers of valence electrons
Answer:
where are the group?
Explanation:
Answer:
Transition metals
Explanation:
It is determined that a metal sample contains 0.251 moles of iron. How many iron atoms are in the sample?
Given parameters:
Number of moles of iron = 0.251 moles
Unknown:
Number of atoms = ?
Solution:
A mole of an atom contains the Avogadro's number of particles;
Avogadro's particles = 6.02 x 10²³ atoms
1 mole of atom = 6.02 x 10²³ atoms
0.251 moles = 0.251 x 6.02 x 10²³ = 1.51 x 10²³ atoms
The number of atoms here is 1.51 x 10²³ atoms
The number of atoms in 0.251 mol of Iron sample has been [tex]1.51\;\times\;10^2^3[/tex].
The number of atoms in a mole of sample has been given by the Avogadro law. According to the Avogadro law, the number of atoms in 1 mole of sample has been equivalent to the Avogadro number.
The Avogadro number has been a constant quantity with the value of [tex]6.023\;\times\;10^2^3[/tex].
Computation for Iron atomsThe given mole of iron has been 0.251 mol.
The number of atoms in the sample has been given as:
[tex]\rm 1\;mol=6.023\;\times\;10^2^3\;atoms\\ 0.251\;mol=0.251\;\times\;6.023\;\times\;10^2^3\;atoms\\ 0.251\;mol=1.51\;\times\;10^2^3\;atoms[/tex]
The number of atoms in 0.251 mol of Iron sample has been [tex]1.51\;\times\;10^2^3[/tex].
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In a wave, matter is...
Answer:
liquid
Explanation:
One difference between mixtures and pure substances is that
A)
mixtures can be physically separated.
B)
mixtures are made of one type of atom.
pure substances have no chemical bonds
D)
pure substances can be physically separated,
ning
Answer:
I think b but I could be wrong
Answer:
a
Explanation:
i just took it
This is a very long thing, Answer any of the questions that you can please anything helps just make sure you put the numbers for the questions you answer:
Question 1: Laws of Conservation of Matter and Energy (2 points)
a. Law of conservation of matter (1 point)
i. What does the law say about matter?
ii. What about matter can change and what does not change, according to the law?
b. Law of conservation of energy (1 point)
i. What does the law say about energy?
ii. What about energy can change and what does not change, according to the law?
Question 2: Phases of Matter (2 points)
a. What are the four states, or phases, of matter? Describe the shape and volume properties of each phase. Can they change, or are they fixed? (1 point)
i. _______________________
Shape:
Volume:
ii. _______________________
Shape:
Volume:
iii. _______________________
Shape:
Volume:
iv. _______________________
Shape:
Volume:
b. When heat energy is absorbed by matter, the matter's temperature increases. When heat energy is released by matter, the matter's temperature decreases. The matter can also change from one phase to another when heat energy is absorbed or released. Identify whether matter absorbs heat or releases heat as each of the following phase changes occur. (1 point)
i. From solid to liquid (melting)
ii. From liquid to solid (freezing or hardening)
iii. From liquid to gas (evaporation)
iv. From gas to liquid (condensation)
Question 3: Types of Energy (4 points)
a. List four kinds of energy. Give a brief definition of each. (1 point)
i. ______________________________________________________________
ii. ______________________________________________________________
iii. ______________________________________________________________
iv. ______________________________________________________________
b. Energy can change from one form to another. Describe the energy conversions in the following scenes. (1 point)
i. A kid falling out of a tree
ii. A scout rubbing sticks together to start a fire
iii. A man running a kerosene heater
c. What is the equation for calculating gravitational potential energy on the Earth? (1 point)
d. What is the equation for calculating kinetic energy (1 point)
Matter cannot be created or destroyed.
Further explanationConservation of mass applies to a closed system, where the masses before and after the reaction are the same
Or
Conservation of mass means:
In a closed/isolated system, the total mass of the substance before the reaction will be equal to the total mass of the reaction product.
So what changes is the form, into a liquid, gas or solid
while what does not change is the mass
*ANSWER FAST AND YOU WILL GET BRAINLIEST* -
According to le châteliers principle how would a change in pressure affect a gaseous system in equilibrium?
A. All equilibrium interactions would stop
B. The equilibrium would shift in the direction of the change
C. The number of both reactants and products would increase
D. The equilibrium would shift to reduce the pressure change
Answer:
D.
Explanation:
Answer:
The correct answer is d. i took the test and got it right
Explanation:
Can anyone help me? :D
What's another word for hypothesis
Answer:
Explanation:
theory
theorem
thesis
conjecture
supposition
speculation
postulation
postulate
proposition
premise
surmise
assumption
presumption
prediction
How do physical changes and chemical changes differ and how are they alike please at least 5 provide examples each for a brainliest!
Answer:
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
How are physical and chemical changes similar and different? (compare and contrast) (Physical and chemical changes are similar because matter experiences a change in state, Physical changes are different because matter remains the same substance, just in a different state, whereas chemical changes change the matter
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input. The only way to reverse a chemical change is via another chemical changes.
Explanation:
Na: 1s22sC2p 3s
C=
D =
E =
Answer:
C = 2
D = 6
E = 1
Explanation:
just took the test :)
A sample of pure lithium nitrate contains 10.1% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the frost sample?
The % lithium by mass in a sample of pure lithium carbonate : 18.79%
Further explanationProust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements
% Lithium (Li) in Li₂CO₃(lithium carbonate) will remain the same even if the mass amount of Li₂CO₃ changes
Ar of Li = 6.941 g/mol
MW of Li₂CO₃ = 73.891 g/mol
[tex]\tt \%Li=\dfrac{2.Ar~Li}{MW~Li_2CO_3}\times 100\%\\\\\5Li=\dfrac{2\times 6.941}{73.891} \times 100\%=18.79\%[/tex]
***BRAINLIEST ASNWERRR***
How many grams are in 34.2 moles of Lithium (Li)?
Mass of Li = 237.38 g
Further explanationThe mole itself is the number of particles contained in a substance amounting to 6.02.10²³
[tex]\large {\boxed {\boxed {\bold {mol = \frac {mass} {molar \: mass}}}}[/tex]
KnownMoles of Li = 34.2
Molar mass(MW) of Li = 6.941 g/mol
then mass of Lithium (Li) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mass=mol\times MW\\\\mass=34.2\times 6,941~g/mol\\\\mass=\boxed{\bold{237.38~g}}[/tex]
What information does a radioactive element's half-life tell you about that element?
You have decided to bake a cake. You mix all of your ingredients together to make a delicious chocolate cake. Then, you bake your cake at 350 degrees fahrenheit. You have to perform both a physical and a chemical change to bake a cake. What is the chemical change? Include at least 2 pieces of evidence or indicators to explain how you know it was a chemical change.
Answer:
A gas is evolved
The ingredients can not be recovered
Explanation:
A chemical change is one in which a new substance is formed and it is not easily reversible.
One major ingredient used in cake baking is the baking powder or baking soda.
Baking a cake can be viewed as a chemical change. This is because, when the baking powder or soda is added in the presence of yeast, carbon dioxide gas is evolved as tiny bubbles of gas which makes the cake light and fluffy. Heat is equally given off in the process. The baking powder and other cake ingredients can not be recovered, hence, we can conclusively assert that a chemical change has taken place.
A tennis ball is moving at a speed of 96.0 miles per hour. Which of the
following is the speed of the ball in meters per second?
Answer:
42.9158 m/s
Explanation:
the answer is there above
How do the lines of the brain and the neurons work together to communicate
When Juan got home from school, he noticed a foul smell coming from the kitchen. He decided to investigate the smell and found fruit sitting on the counter. There was evidence that a chemical reaction had occurred. When he looked at the fruit, he saw that it had turned brown and was soft to the touch. Write a short claim evedence and reasoning. If you could separate them it would be geat
Answer:
See explanation
Explanation:
A chemical reaction is said to have occurred when there is a permanent, irreversible change in a substance.
Considering the fruit in the question, the changes in the fruit can not be reversed. Nothing can ever be done to return the fruit to its original form. This ultimately shows that a chemical reaction has taken place.
Secondly, the occurrence of a chemical reaction can be confirmed by evolution of a gas. The foul smell that filled the kitchen is the gas evolved during the chemical reaction involving the rotten fruit.
At point R, rocks melt underground to form magma. Which is another process that contributes to the formation of rock at point R?
compacting of sediments on the mountain
cooling as the lava runs down the mountain
weathering of the mountain from the environment
eroding of different rocks at the base of the mountain
Another process that contributes to the formation of rock at point R is the:
B. Cooling as the lava runs down the mountainAccording to the given question, we need to find another process which can help with the rock formation at point R where the rock melts underground to form magma.
As a result of this, another process through which makes a significant contribution to the formation of rock at point R is the cooling of the lava as the magma which has been melted runs down the mountain.
Therefore, the correct answer is option B
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how much protons, neutrons, and electrons does iodine-132 1- ion have
The number of protons, neutrons, and electrons is iodine-132, Iodine has 53 protons and 53 electrons as it has no charge the number of protons equals the number of electrons. Iodine-131 has 131 protons as well as neutrons.
What are protons?Protons are subatomic particles that have a positive charge. The strong nuclear force holds protons together in the nucleus of an atom. Neutrons are non-charged subatomic particles (they are neutral).
A proton is a subatomic particle found in every atom's nucleus. The particle has a positive electrical charge that is equal to and opposite to the electron's.
Iodine-132 is the number of protons, neutrons, and electrons. Iodine has 53 protons and 53 electrons because it has no charge, so the number of protons equals the number of electrons. Iodine-131 contains 131 protons and neutrons.
Thus, there will be 131 protons as well as neutrons in iodine-131.
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Match the words to the correct descriptions.
Have different properties depending on the number of protons.
The ingredients maintain their properties when they are placed together or taken apart.
The atoms take on new properties when they bond together or are separated.
1.
Compounds
2.
Mixtures
3.
Atoms
Answer:
1. Atoms, Have different properties depending on the number of protons.
2. Mixtures, The ingredients maintain their properties when they are placed together or taken apart.
3. Compounds, The atoms take on new properties when they bond together or are separated.
Explanation:
