Answers
Answer:
The answer is A.) leaving a copper penny in vinegar until it turns green.
All the other options are physical changes, as you can separate the two mixtures.
I hope this helps you! :)
Related Questions
Which of the following is not involved in bringing materials into cells?
a. endocytosis b. osmosis c. active transport d. exocytosis
Answers
Answer:
b
Explanation:
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Physical change definition.
NO links, please.
Answers
Answer:
a usually reversible change in the physical properties of a substance, as size or shape:
Freezing a liquid is a physical change.
Explanation:
Answer:
Hey!
Explanation:
The definition of physical change can be expressed as.. let's say.. the physical difference in an organism. Physical change affects the form of a chemical substance, but not its chemical composition. Hope this helps! :)
Which of the following particles are found in the nucleus of an atom? (Select all that apply).electronsprotonsneutronscompounds
Answers
Answer:
protons and neutrons
Explanation:
Neutrons and protons are the particles that are found in the nucleus of an atom.
What are protons and neutrons?Protons and neutrons are subatomic particles. They are present in the nucleus of an atom and constitute most of the mass of the atom. There are three kinds of subatomic particles that are present in an atom.
These are -
Electrons: Electrons are negatively charged particles. These are present in the atomic shells of the atom. The number of electrons in the last shell of the atom constitutes the valency of the atom. Protons: Protons are positively charged particles. These are present in the nucleus of the atom.Neutrons: Neutrons are neutral molecules with no charge. These are also present in the nucleus of the atom.Since most of the mass of the atom, in the form of protons and neutrons, is present in the nucleus, the mass number is denoted as the sum of the number of protons and neutrons. Protons and neutrons together are sometimes also called nucleons.
Therefore, neutrons and protons are present in the nucleus of an atom.
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a standard solution is made by diluting a small volume of stock solution. if 2.42 ml of stock solution is mixed with 7.55 ml of water, what is the concentration of the diluted solution? the stock solution concentration is 0.197 m.
Answers
Taking into account the definition of dilution, the concentration of the diluted solution is 0.063 M.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeConcentration of the diluted solutionIn this case, you know:
Ci= 0.197 MVi= 2.42 mLCf= ?Vf= 7.55 mLReplacing in the definition of dilution:
0.197 M× 2.42 mL= Cf× 7.55 mL
Solving:
(0.197 M× 2.42 mL)÷ 7.55 mL= Cf
0.063 M= Cf
In summary, the concentration of the diluted solution is 0.063 M.
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Summarize Hooke's observations of cork under the microscope
Answers
Answer:
I don't know
Explanation:
pls I need a little bit answer
acid + base —> salt + water
What type of reaction is this?
Answers
[tex]\sf{Acid}+\bf{Base}\longrightarrow \tt{Salt}+\bold{Water }[/tex]
These type of reaction is called as Neutralization Reaction.
Which equation is balanced?
A) A
B) B
C) C
D) D
Answers
Answer:
All of them are equal cause they both have the same sign
Explanation:
draw the product of the sn2 reaction and indicate stereochemistry. write the inorganic product in the answer palette.
Answers
SN2 reaction proceeds with inversion of configuration at the reacting carbon atom. The product has a different configuration at this carbon atom from the product.
SN2 reaction is a short form for substitution nucleophilic bimolecular reaction. It is a synchronous reaction in which the leaving group departs at the same time as the nucleophile attacks in a single transition state.
Recall that SN2 reaction proceeds with inversion of configuration hence the product has a different configuration at the reacting carbon atom from the product. The inorganic product in this reaction is HI. The organic product is shown in the image attached to this answer.
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PLEASE HELP I BEG
Q2 answer in one word
1.two important properties of any sound
2.time taken by a vibrating body to complete one vibration
3. vibration of frequency higher than 20000 Hz
Answers
Answer:
1.Velocity and pitch
2.The unit of vibration is hertz. The number of oscillations of an oscillating body per second is known as frequency. Complete step by step answer: The time taken by a vibrating body to complete one vibration is time period.
3.Frequencies above 20,000 Hz are known as ultrasound.
how many electrons can occupy the 4p sublevel of a neutral atom of bromine
Answers
Answer:
6
Explanation
every p sublevel holds up to 6 electrons
so the 4p sublevel must hold up to 6 electonsr
Faster Rate: Higher temperature, Lower Rate: Higher temperature
Question 9 (2 points)
(02.04 MC)
John has three cups of sugar particles. Cup 1 has large sugar particles, Cup 2 has medium-sized particles, and Cup 3 has small sugar particles. If
John pours each cup in water, which cup of sugar particles will dissolve the fastest? (2 points)
оа
Cup 1 will dissolve the fastest.
Ob
Cup 2 will dissolve the fastest.
Oc
Cup 3 will dissolve the fastest.
Od
They will dissolve at the same rate.
Question 10 (2 points)
(02.04 MC)
Gina predicts that one really large cube of sugar will dissolve faster than the same amount of sugar in several medium-sized cubes. She thinks
rube. It has more surface area and will dissolve faster than the several medium-sized cubes. What is the
Answers
Answer:
cup c will dissolve the fastest
Explanation:
Because the particle size is smaller, the water can dissolve them quicker as the smaller the particle, the more surface are for the water to dissolve.
What part of the earth absorbs most of the sun's radiation?answers 1.The ocean. 1.The ground. 1.The clouds. 1.The lakes.
Answers
Answer: the ground
Explanation:
why are being flammable and combustible be considered to be chemical properties and not physical properties?
Answers
Answer:
Because combustion is a chemical change and not a physical change. Do, flammable and combustible gases burn and change into new substance.
As opposed to a physical change, combustion is a chemical transformation. Combustible and flammable gases do burn and transform into new substances.
What are considered combustible?Combustible materials are those that, when exposed to fire or heat, will ignite, burn, sustain combustion, or produce flammable gases in the form and circumstances anticipated for their application. Combustible materials include rubber, plastics, rubberized materials, and wood.
Are metals combustible?Depending on the environmental factors, most metals are flammable to varied degrees. With water, acids, and other chemicals, certain metals can react in ways that are hazardous. Some metals can spontaneously ignite and heat up.
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What happens to mass and energy in a closed system?
A. Only energy can enter or exit a closed system.
B. Neither energy nor mass can enter or exit a closed system.
C. Only mass can enter or exit a closed system.
D. Both energy and mass can enter or exit a closed system.
Answers
Answer:
the correct answer is D. Both energy and mass can enter or exit a closed system.
Explanation:
Answer: A.
Explanation:
only energy can enter or exit a closed system
Can liquid methane change phases?
Answers
Answer: Methane is a gas at standard conditions.
Explanation: However, at low temperature and/or high pressures the gas becomes a liquid or a solid.
Answer: yes
Explanation:
in which step of the scientific method do we want to use graphs
Answers
Explanation:
The next step in the scientific method is to analyze the data. Data analysis is the process of interpreting the meaning of the data we have collected, organized, and displayed in the form of a table or graph.
I will make you brainless answer this 1 question pleaaeeee!
Answers
C. Point 3
Explanation:
Because it is increasing dramatically
Diagrammatic Questions: m. Write the name of the elements of the given nucleus of the atoms.
11 p+
0n⁰
17 p+
18n⁰
5p+
6n⁰
11p+
12n⁰
19p+
20n⁰
Answers
Explanation:
Atomic;
Numb...
SymbolN
ame
Atomic Mass...1HHydrogen1.007972HeHelium4.002603LiLithium6.941
how can you tell whether a substance is a binary compound
Answers
Given what we know, we can confirm that a compound will be a binary compound if it contains both a metal and a non-metal element.
Why does this combination form binary compounds?The reason for this is that metals will be able to donate electrons thanks to their chemical properties. Meanwhile, non-metal elements will seek to receive electrons to become more stable.For these reasons, metals and non-metals will come together to create covalent bonds, and thus, binary compounds.Therefore we can confirm that since a metal will donate its electron to a non-metal element to form covalent bonds, we will know if the compound is binary or not based on the presence of a metal and a non-metal.
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which particles are in the nucleus of an atom of neon-20?
Answers
Neon’s atomic number is 10 so 10 protons and If the atomic mass is 20 it would be 20 minus the 10 protons so 10 neutrons if that made any sense.
. Why can atomic number be used to determine the identity of an element?
Answers
Answer:
Because each atomic number is unique.
Explanation:
Atomic number = No. of protons in an element
Each atomic number in each element is unique and that makes it easier to distinguish it between several elements.
Answer:
Because atomic numbers are unique to the element
hope this helps <3
Problem: Janna, a student of a chemistry class, told her friend that she learnt in class that bottled water is not pure. Kim, her best friend, refused to believe Janna, referring to phrases on the label of the bottle.Help me
Answers
Answer:
The bottle is labeled pure so it probably is pure.
Explanation:
hello can anyone help?
Potassium, K, forms a compound with fluorine, F
Which statements about this compound are correct?
1) The compound is ionic.
2) The formula of the compound is KF.
3) The compound is soluble in water.
A) 1 2 and 3
B) 1 and 2 only.
C) 1 and 3 only
D) 2 and 3 only
Answers
Answer:
A ) 1, 2 and 3
Explanation:
1 ) is correct because,
K donates 1 electron
F gain 1 electron from K.
If donating and gaining of electrons takes place between two electron, then type of compound formed is ionic.
2 ) is correct because,
K + F -----> KF
3 ) is correct because,
KF is soluble in cold water; very soluble in hot water.
A strong acid is one that
a Doesn’t easily dissociate into ions when I’m solution
B is very dilute in the solution
C easily dissociates into ions when I’m solution
d is very concentrated in the solution
Answers
Answer:
C. easily dissociates into ions when I’m solution
Explanation:
Strong acids are compounds that completely decompose when dissolved in water and produce the total number of ions.
An atom is electrically neutral when...
O The number of protons and neutrons are equal.
O The number of protons and electrons are equal.
O The number of neutrons and electrons are equal.
O The neutrons balance the protons and electrons.
Answers
Answer:
The number of protons and electrons are equal.
Explanation:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
Which statement describes the bonds in iron sulfate, FeSO4?
Fe and S have an ionic bond, while S and O have covalent bonds.
Fe and S have a covalent bond, and S and O have covalent bonds, too.
Fe and S have a covalent bond, while S and O have ionic bonds.
Fe and S have an ionic bond, and S and O have ionic bonds, too.
Answers
___
Regarding the bonds in FesO₄, Fe and S have an ionic bond, while S and O have covalent bonds.
Elements form bonds to increase their stability. The main types of bonds are:
Metallic bonds: they are formed between metals and the electrons are in a delocalized cloud.Ionic bonds: they are formed between metals (lose electrons) and nonmetals (gain electrons)Covalent bonds: they are formed between nonmetals, which share electrons.Regarding the bonds in FesO₄:
Fe is a metal and S a nonmetal, thus they will form ionic bonds.S and O are both nonmetals, thus they will form covalent bonds.Regarding the bonds in FesO₄, Fe and S have an ionic bond, while S and O have covalent bonds.
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Which of the following is a liquid someone help!!!!!
Answers
this question is most likely a joke :)
Which of the following is the best explanation for the fact that crushing increases the rate at which a solid dissolves in a liquid?
Select one:
a. The temperature of the solution is increased when the solid is crushed.
b. The surface area of the solute is increased when it is crushed.
c. Crushing increases the amount of solute present.
d. Crushing makes stirring the solution easier.
Answers
Explain how the fire spreading from tree to tree provides a model for conduction.
The great fire of 1910 burned through parts of north Idaho, western Montana, eastern Washington,and southeastern British Columbia. Many small fires and several large fires that were started by an electric storm coalesced into one”big blowup” of unprecedented size that lasted two days. Hurricane-force winds spread the firestorm; trees became blowtorches, sucking fire from the ground and hurling it in several directions, spreading the fire on contact. Witnesses described fireballs being flung like cannons. Trees exploded like fireworks. The fire killed 87 people, destroyed towns in its path, and burned more than three million acres of forest
Answers
the fire spreading is what represents the form of heat transferring from one atom to another within an object and direct contact
Which of the following is a true statement?
Growth cycles only happen to reptiles.
Growth cycles happen to all animals.
Growth cycles only happen to birds.
Growth cycles only happen to mammals.
Answers
Answer:
its either all animals or only mammals. the thing with all animals is that they do have life cycles but not the same as like say humans or elephants, some are complicated.