Answer:
it is indeed a compound
Explanation:
A sample of gas under pressure of 882kPa has a volume of 312cm3. The pressure is increased to 948kPa. What volume will the gas occupy at the new pressure, assuming that the temperature is constant?
Answer:
V₂ = 290.3 cm³
Explanation:
Given data:
Initial pressure = 882 KPa
Initial volume = 312 cm³
Final pressure = 948 KPa
Final volume = ?
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
882 KPa× 312 cm³ = 948 KPa × V₂
V₂ = 882 KPa× 312 cm³/ 948 KPa
V₂ = 290.3 cm³
calculate the number of neutrons in potassium-40.
Considering the definiton of atomic number and atomic mass, the number of neutrons of the potassium is 21.
All atoms are composed of a central nucleus in which there are particles with a positive electric charge, the protons, and a neutral charge, the neutrons, around which other particles with a negative electric charge, which are electrons, move.
Atoms of different elements have different amounts of protons. The atomic number (which is identified by the letter Z) indicates the amount of protons that is present in the nucleus of an atom. This number is then responsible for defining the electronic configuration of the atom and the chemical properties of the element.
On the other side, the atomic mass (A) is defined as the sum of number of protons and number of neutrons:
Atomic mass = Number of protons + Number of neutrons
In this case, the potassium (K) elements has atomic number 19. That means, the number of of protons is equal to 19. And the atomic mass is 40. So, the number of neutrons is calculated as:
40= 19 + Number of neutrons
Solving:
Number of neutrons= 40 - 19
Number of neutrons= 21
Hence, the number of neutrons of the potassium is 21.
Learn more:
https://brainly.com/question/5527493?referrer=searchResultsbrainly.com/question/11837355?referrer=searchResults brainly.com/question/1758023awnser for brainlist
Answer:
D
Explanation:
i might be wrong but im sorry if i am
Answer:
D
Explanation:
The roadrunner eats the scorpion. Thus, it's the predator and the scorpion is the prey
What are the coefficients when the chemical equation below is balanced?
_Fe + _H2SO4 = _Fe2(SO4)3 + _H2
A) 2,3,3,3
B) 3,2,3,1
C) 1,1,1,1
D) 2,3,1,3
Frank is skating with his friends. His nonverbal communication is sending several messages. Which of the following below best describes the messages he is sending, both consciously and unconsciously?
a.
formal, serious, shy, closed, uncertainty, exhaustion, confusion
b.
casual, fun, concentration, warmth, confidence, health, carefree, open
c.
culture, class, confidence, success, work ethic, tradition, excel
d.
fear, anxiety, uncertainty, risk, isolation, danger, loneliness, pain
Answer: d i just took the test
What kind of bond is made up of shared electrons?
A. A covalent bond
B. An ionic bond
C. A hydrogen bond
D. An electrostatic bond
Answer:
A. A covalent bond.
Need a longer answer...
a covalent bond
AP ex
what would be the definition of chemical indicators?
Answer:
Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.
Explanation:
iupac name of h3C-C-Ch2-ch3
Answer:
The IUPAC name of given compound is 3−5−ethyl−5−−3−methylheptane. Explanation: The parental chain is of 7 carbons with single bonds hence it is heptane. Two substituents ethyl and methyl group are attached from an equal distance. Hence according to the alphabetical order preference, counting starts from carbon which is close to an ethyl group.
A large balloon contains 233 L of neon at 22.0C and 760. Torr. If the balloon ascends to an altitude where the temperature is - 52.0C and the pressure is 511 torr, what is the volume in the balloon at the higher altitude?
Answer: The volume in the balloon at the higher altitude is 260 L
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 760 torr
[tex]P_2[/tex] = final pressure of gas = 511 torr
[tex]V_1[/tex] = initial volume of gas = 233 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]22.0^0C=(22.0+273)K=295K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]-52.0^0C=(-52.0+273)K=221K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{760\times 233}{295}=\frac{511\times V_2}{221}[/tex]
[tex]V_2=260L[/tex]
The volume in the balloon at the higher altitude is 260 L
GUYS I NEED THIS ASAP
5) If an atom has a positive charge what is it called?
Answer:
An atom that has a negative or positive charge it is called an ion.
Answer:
It''s called a Cation
Explanation:
How does the mass of an atom effect the amount a charged atom gets deflected?
) what happens when CO2 passed over time water
for short period of time? Explain
Answer:
When carbon dioxide is passed through lime water for a short time,it turns lime water milky due to formation of a white precipitate of calcium carbonate.
Explanation:
Carbon dioxide dissolves in water and slowly reacts with water to produce carbonic acid. The cloudy white solution observed when CO2 is bubbled into limewater results from a reaction between Ca(OH)2 and either CO2 or H2CO3 to form an insoluble calcium carbonate precipitate.
A model of a beryllium atom is shown below. What types of particles are found in the cloud surrounding the atom’s nucleus?
Answer:
Neutral particles and positively charged particles
Question
Select all the correct answers.
Which statements are true about all waves?
It’s caused by a disturbance.
It requires a medium to travel.
It carries energy.
It carries matter.
Answer:
It’s caused by a disturbance.
It carries energy.
Explanation:
A wave is a disturbance that transmits energy from one point to another. It does no necessarily carry the particles or matter of the medium.
Waves usually carries energy. It is this energy they use in creating disturbances.
Not all waves carries matter; a good example is electromagnetic waves. Also, electromagnetic waves do not require a medium for propagation.
Which of the following molecules has a bent shape?
Answer: CORRECT answer is A
Cl/S\Cl
Explanation:
A P EX
The teacher shows students a pictorial model of an atom. Which element is
represented by the model and what evidence is provided?
A. Fluorine because the model has 19 neutrons and electrons which is represented by the
atomic number found on the periodic table.
B. Fluorine because the model has 9 protons which is represented by the mass number found
on the periodic table.
C. Fluorine because the model has 9 protons which is represented by the atomic number
found on the periodic table.
D. Neon because there are 10 neutrons which is represented by the atomic number found on
the periodic table.
Answer:
C. Fluorine because the model has 9 protons which is represented by the atomic number
Explanation:
We usually identify an element by the number of protons in them. The number of protons is the atomic number of an atom.
Every atom has a specific number of protons in them. This number of protons is the atomic number.According to the periodic law, atoms are arranged on the periodic table based on their atomic number. The given fluorine atom has 9 protons which represents the atomic number of the atom. This way, the given number clearly shows the right model for identifying the chemical specie.Which half-reaction correctly describes an oxidation?
Upper C a (s) plus 2 e superscript minus right arrow upper C a superscript 2 plus (a q).
Upper B r subscript 2 plus 2 e superscript minus right arrow 2 upper B r superscript minus.
Upper N a superscript plus (a q) right arrow upper N a (s) plus e superscript minus.
Upper C r (s) right arrow upper C r superscript 3 plus (a q) plus 3 e superscript minus.
Answer: The Answer was D. These people trolling. Look at the attachments I put on
Explanation:
An oxidation half reaction is one in which electrons are lost. Hence the reaction, Cr^3+(aq) ----> Cr(s) + 3e is an oxidation reaction.
What is oxidation?The term oxidation has to do with the loss of electrons. When an oxidation half reaction takes place, a specie loose electrons. We will now look out for the reaction in which electron loss takes place.
Now, in option D, the reaction is Cr^3+(aq) ----> Cr(s) + 3e. Three electrons where lost here hence this is an oxidation half reaction.
Learn more about oxidation: https://brainly.com/question/9496279?
compounds pure substances made of two or more types of _____ and are _____ _______
Answer: chemical substance
Explanation:
why is it easier to remove an electron from a sodium atom than a magnesium atom
A scientist is breeding orange butterflies in the laboratory she notices a white butterfly in the latest generation of animals she sequences the genome of this butterfly in notices a mutation in the genes that calls for pigment in the wings. Explain how this mutation would result in a white butterfly.
Answer:
See explanation
Explanation:
A gene mutation can be defined as a permanent change in the DNA sequence that composes a gene, resulting in the observation that the sequence differs from what is obtainable in most individuals that make up the population. Mutations range from a change in a single DNA building block (change in the sequence of base pairs) to changes in a large segment of a chromosome that includes multiple genes.
Mutation in the color of the wings of the housefly can be passed on to the next generation. If this trait enhances survival of the butterflies, the orange winged butterflies will eventual become extinct and become entirely replaced by the white winged butterflies. This implies that gene pool has been completely modified.
If same kind of mutation of pigmentation of wings is observed in the butterfly then they will result in a white butterfly.
What is mutation?If a gene of the DNA get damaged or changes in such a way that it also results in the changing of genetic message carried by that gene and this process is known by the name of mutation.
In the given question by breeding orange butterfly with a white butterfly in the latest generation of animals, notices a mutation in the genes that calls for pigment in the wings. If the mutation of pigmentation of wings is passed to the next generations with the same changes in the gene of DNA, then after some generation we would get white butterfly.
Hence, if the same changes observed in the mutation of pigmentation of wings then we get a white butterfly.
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True or False? If friction didn’t exist, an object in motion would stay in motion forever.
Answer:
True
Explanation:
Friction is defined as the force that opposes motion when an object is sliding over a surface.
As a result of friction, all objects moving over a surface eventually come to rest over time.If we were to successfully create a friction-less surface, an object will remain in motion forever because it will encounter no opposition to its motion.
Hence, the resistance to the motion of objects over a surface which causes the objects to come to a halt after moving over the surface for some time is called friction.
Your friends car has stalled in the road. You help you friend push the car off the road. Your friend pushed with a force of 55 N and you push in the same direction with a force of 60 N. How much force is being applied to the car
Answer:
115N
Explanation:
your friend and you push the car at the same time at the same direction so you add the force your friend is using and the force you’re using so: 60+55=115N
200 cm is equal to how many meters?
you observe the light from a distant star through a spectroscopy. According to the belief that the universe is expanding from a single dense point ise the picture above to explain how it represents the ligt from the galaxy?
Answer:
The galaxies outside of our own are moving away from us, and the ones that are farthest away are moving the fastest. This means that no matter what galaxy you happen to be in, all the other galaxies are moving away from you.
However, the galaxies are not moving through space, they are moving in space, because space is also moving. In other words, the universe has no center; everything is moving away from everything else. If you imagine a grid of space with a galaxy every million light years or so, after enough time passes this grid will stretch out so that the galaxies are spread to every two million light years, and so on, possibly into infinity. The universe encompasses everything in existence, from the smallest atom to the largest galaxy; since forming some 13.7 billion years ago in the Big Bang, it has been expanding and may be infinite in its scope. The part of the universe of which we have knowledge is called the observable universe, the region around Earth from which light has had time to reach us.
One famous analogy to explain the expanding universe is imagining the universe like a loaf of raisin bread dough. As the bread rises and expands, the raisins move farther away from each other, but they are still stuck in the dough. In the case of the universe, there may be raisins out there that we can’t see any more because they have moved away so fast that their light has never reached Earth. Fortunately, gravity is in control of things at the local level and keeps our raisins together.The American astronomer Edwin Hubble made the observations in 1925 and was the first to prove that the universe is expanding. He proved that there is a direct relationship between the speeds of distant galaxies and their distances from Earth. This is now known as Hubble’s Law. The Hubble Space Telescope was named after him, and the single number that describes the rate of the cosmic expansion, relating the apparent recession velocities of external galaxies to their distance, is called the Hubble Constant. It might be easier to explain about the beginning of the universe and the Big Bang Theory, than to talk about how it will end. It is possible that the universe will last forever, or it may be crushed out of existence in a reverse of the Big Bang scenario, but that would be so far in the future that it might as well be infinite. Until recently, cosmologists (the scientists who study the universe) assumed that the rate of the universe’s expansion was slowing because of the effects of gravity. However, current research indicates that the universe may expand to eternity. But research continues and new studies of supernovae in remote galaxies and a force called dark energy may modify the possible fates of the universe.
Explanation:
I hope I help :))
The big bang theory states that the universe started from a single dense point. This single point stretched and inflated gradually because of the expansion. The light from the galaxy shows an increase in the wavelength due to this expansion.
What does light from a galaxy tell about the expansion of the universe?By looking at ultraviolet light, astronomers can tell which stars are forming in different galaxies and where they’re forming inside those galaxies. The ultraviolet and visible light coming from the most distant galaxies is converted into infrared light on its way through the expanding universe.
As the universe is expanding the galaxies are moving away from us. There is a shift in the wavelength of the light coming from these galaxies. This shift in the wavelength is referred to as redshift. This is because an expansion of the universe causes an increase in the distance between the two crests of the wave which results in the wavelength increase.
To learn more about galaxies, refer to the link:
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AgNO3 + KCI = AgCI + KNO3
(What is the chemical reaction?)
PLEASE HELP ME WITH THIS CHEM WORK!!!
I’LL GIVE A BRAINIEST TO WHOEVER GETS IT RIGHT:)
1.) 50.0 grams of water at 100 degrees Celsius evaporated to water vapor 2 points
at 100 degrees Celsius. Calculate the amount of heat required for this
conversion.
2.) A student measured 15.0 grams of ice in a beaker. The beaker was then
placed on a hot plate where it was heated uniformly for a certain amount
of time. During the melting process of the ice, the student noted that the
temperature was at 0 degree Celsius. When all the ice converted to water,
the final temperature was also at 0 degree Celsius. How much heat was
used to melt the ice?
1. Q = 112.8 kJ
2. Q = 5.01 kJ
Further explanationThe heat to change the phase can be formulated :
Q = mLf (melting/freezing)
Q = mLv (vaporization/condensation)
Lf=latent heat of fusion
Lv=latent heat of vaporization
1. m=50 g=0.05 kg
Lv for water = 2256 kJ/kg
[tex]\tt Q=m.L_v\\\\Q=0.05\times 2256\\\\Q=\boxed{\bold{112.8~kJ}}[/tex]
2. m=15 g=0.015 kg
Lf for water = 334 kj/kg
[tex]\tt Q=m.L_f\\\\Q=0.015\times 334\\\\Q=\boxed{\bold{5.01~kJ}}[/tex]
Question 5: Causes of Molecular Shape (3 points)
a. What is the VSEPR theory? (1 point)
b. How does electron repulsion determine molecular shape? (1 point)
c. How do lone electron pairs affect molecular shape? (1 point)
Answer:
A. VSEPR theory assumes each atom molecule has a geometry to help minimize the repulsion between the electrons within the valence shell of the central atom.
B. Repulsion determines the molecular shape as the electrons are negativley charged. The negativity makes the atoms spread out as much as possible.
C. Lone electron pairs have greater repelling effects as they are closer to the nucleus of the central atom unlike bonding pairs.
Explanation:
which of the following is an example of a Brønsted-Lowry base?
Answer:
it's ammonia. option a
Explanation:
a
The picture shows a periodic table with elements X and Y.
If the atomic number of element X is 3, then what is the atomic number of element Y?
A. 5
B. 7
C. 19
D. 25
Answer:
7
the atomic number of element X is 3, then atomic number of element Y is 7
