Hello!
The chemical equation for the neutralization of HCl with KOH is the following:
HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)
To calculate the concentration of the unknown solution, we can apply the following equation for the equivalence point:
So, the concentration of the HCl solution is 1,246 M
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What are some natural processes that represent physical and chemical changes?
this is in science, but it made me choose chemistry
A "natural" chemical change would be burning wood, cooking eggs, baking a cake and milk going sour. These changes can't be changed so therefore they are chemical changes.
A natural physical change would be mixing salt or sand with water, melting or boiling water, cutting wood, and shredding paper. The salt and sand can be removed from the water. Hot and cold water are still water. Wood and paper didn't change their composition. All of these examples are reversible.
Answer:
Chemical change:
Rusting of a metal ironFood contaminationSeed germinationPhysical change:
Melting of iceBoiling of waterRock weatheringExplanation:
The difference chemical and physical change is physical change is the change of form, such as change in shape, and chemical change is the change of chemical bonds.
In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using? A. chromatography B. distillation C. filtration D. fragmentation E. condensation
The answer is C. Filtration
Answer : The correct option is, (C) Filtration.
Explanation :
Chromatography : It is a type of separation process in which the liquid or gas is separated into components at different rate.
Distillation : It is a type of separation process in which the mixture of liquid separated or evaporated at different temperatures.
Filtration : It is a type of mechanical separation process in which the solid is separated from the liquid through the filter paper.
Fragmentation : It is a type of process where the molecular ion breaks into the smaller ions or smaller radicals or neutral molecules.
Condensation : It is a type of process in which the phase changes from gaseous state to liquid state at constant temperature.
Hence, the correct option is, (C) Filtration.
A 4.700 L sample of gas is cooled from 71.0 °C to a temperature at which its volume is 3.300 L. What is this new temperature? Assume no change in pressure of the gas.
initial condition : Vi = 4.700 L , Ti = 71.0ºC +273 => 344 K
final condition : Vf = 3.300 L , Tf = ?
Pressure is constant:
According to charle's law , volume is directly proportional to temperature at constant pressure !
Hence Vi / Ti = Vf / Tf
4.700 L / 344 K = 3.300 L / Tf
Tf = 3.300 L * 344 K / 4.700 L
Tf = 1135200 / 4.700
Tf = 241.53 K
Tf = 241.53 - 273
Tf = -31.47ºC
What is the mass of one mole of carbon dioxide, CO2? Round your answer to 2 places past the decimal. g/mol
44.00
28.01
44.01
Answer:- 44.01 gram per mol.
Solution:- Mass of one mole means the formula mass of the compound. Carbon dioxide has one carbon and two oxygens.
So, formula mass of carbon dioxide = atomic mass of C + 2(atomic mass of O)
Atomic mass of carbon is 12.01 and atomic mass of O is 16.00. So, formula mass of carbon dioxide = 12.01+2(16.00)
= 12.01+32.00
= 44.01
So, the mass of one mole of carbon dioxide is 44.01.
which of these scenarios involve a reaction that is at equilibrium
a.the reaction is producing more products than reactants
b..the reaction is producing more reactants than products
c. the amount is producing more reactants is changing
d.the amount is producing more reactants is constant
The correct answer is, the amount of products and reactants is constant.
Only answer number 8-9
A common function of proteins and carbohydrates in the plasma membrane is...
A. Synthesis of enzymes
B. Cell recognition and interaction
C. Transcription of DNA
D. Regulation of the cell cycle
A common function of proteins and carbohydrates in the plasma membrane is cell recognition and interaction.
What are carbohydrates?A carbohydrate is defined as a bio-molecule which consists of carbon,hydrogen and oxygen atoms which are usually in the ratio of 2:1 with the empirical formula C[tex]_n[/tex](H₂O)[tex]_n[/tex].
This term is most commonly used in biochemistry as a synonym of saccharide which is a group of sugars, starch and cellulose.
They perform various functions in living organisms. They serve as an energy source and as well as structural components . They are a key component in providing nutrition and are found in wide variety of natural as well as processed foods.
Carbohydrates occur as cellulose in the cell walls of plants and is one of the components of insoluble dietary fibers.
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Column A
1.
isotope:
isotope
2.
neutron:
neutron
3.
drudgery:
drudgery
4.
mass number:
mass number
5.
perceive:
perceive
6.
atomic mass:
atomic mass
7.
implore:
implore
8.
badger:
badger
9.
proton:
proton
10.
atomic mass unit:
atomic mass unit
11.
atomic number:
atomic number
12.
interminable:
interminable
Column B
a.The electrical attraction between a __________ and an electron is forty powers of ten stronger than their gravitational attraction.
b.Lithium, with an __________ of 6.94, is the lightest of all the metals and is therefore an obvious candidate for battery use.
c.Protons and neutrons have masses of approximately 1 __________ each.
d.Other species can __________ colors of the spectrum that are invisible to us.
e.Technological advances have taken much of the __________ out of the assembly line and car plant.
f.Nitrogen has 7 protons and 7 neutrons in its nucleus, giving it a __________ of 14
g.Secondly, we need a leader of charisma to __________ and provoke his colleagues into action.
h.The system thus avoids the seemingly __________ delays that bedevil on-line services when they are used to transmit graphics.
i.The nucleus of a deuterium atom contains a proton and a __________.
j.Newspapers and television __________ us to slit all the candy open to ensure that it contains no foreign body.
k.But barium has an __________ of 56, barely more than half that of uranium.
l.The third __________ of hydrogen, hydrogen-3 or tritium, is highly radioactive and has a very short half-life.
a) Answer is: The electrical attraction between a proton and an electron is forty powers of ten stronger than their gravitational attraction.
Proton is a subatomic particle with a positive electric charge of +1e elementary charge.
The electron (symbol: e⁻) is a subatomic particle whose electric charge is negative one elementary charge.
Opposite charges (positive and negative) attract one another.
b) Answer is: Lithium, with an atomic mass of 6.94, is the lightest of all the metals and is therefore an obvious candidate for battery use.
The atomic mass is the average mass of element.
The average atomic mass of krypton =
= ω(⁸²Kr) · Ar(⁸²Kr) + ω(⁸³Kr)·Ar(⁸³Kr) + ω(⁸⁴Kr) · Ar(⁸⁴Kr) + ω(⁸⁵Kr)· Ar(⁸⁵Kr).
ω(Kr) is average abundance of isotopes of krypton.
Ar(Kr) is atomic mass of krypton isotope.
Another examples, atomic mass of phosphorus (P) is 30.97 and atomic mass of oxygen (O) is 15.99.
c) Answer is: Protons and neutrons have masses of approximately 1 atomic mass unit each.
The unified atomic mass unit (amu) is a standard unit of atom mass.
One unified atomic mass unit is approximately the mass of one nucleon (protons or neutrons).
The unified atomic mass unit is equal 1.66·10⁻²⁷ kg.
d) Answer is: Other species can see colors of the spectrum that are invisible to us.
For example, a common butterfly has five times more photoreceptors in their eyes than human.
So butterfly can see ultraviolet and violet spectar of colors (human can not see violet and ultraviolet), they see different wavelength than human.
e) Answer is: Technological advances have taken much of the drudgery out of the assembly line and car plant.
Drudgery is hard monotonous routine work.
At assembly lines and car plant at the beggining of the 20th century, hard work were doing humans, now with technology advances, that work is than by the machines or robots.
f) Answer is: Nitrogen has 7 protons and 7 neutrons in the nucleus, giving it a mass number of 14.
The mass number (A) is sum of the number of protons and the number of neutrons in atom.
n°(N) = 7; number of neutrons in nitrogen atom.
p⁺(N) = 7; number of protons in nitrogen atom.
A = n° + p⁺.
A(N) = 7 + 7.
A(N) = 14; nitrogen mass number is 14.
h) Answer is: The system thus avoids the seemingly interminable delays that bedevil on-line services when they are used to transmit graphics.
Interminable means something continuing for too long and because of that is boring or annoying.
i) Answer is: The nucleus of a deuterium atom contains a proton and a neutron.
Deuterium (₁²H or D) is an isotope of the hydrogen (H).
Deuterium has atomic number 1 (it has one proton) and mass number 2.
p⁺(D) = 1; number of protons in deuterium.
A = n° + p⁺.
A(D) = 2; mass number of deuterium.
n°(D) = 2 -1.
n°(D) = 1; number of neutrons in deuterium.
Isotopes are chemical elements with same atomic number, but different mass number (different number of neutrons).
j) Answer is: Newspapers and television perceive us to slit all the candy open to ensure that it contains no foreign body.
Newspapers and television make us to belief in or about something.
k) Answer is: But barium has an atomic number of 56, barely more than half that of uranium.
Atomic number (Z) is the number of protons (number of protons in neutral atom is the same as number of an electrons), which is characteristic of a chemical element,
Atomic number is unique and defines an element.
Atomic number of uranium (U) is 92 (Z = 92).
l) Answer is: The third isotope of hydrogen, hydrogen-3 or tritium, is highly radioactive and has a very short half-life.
Tritium (₁³H or T) is an isotope of the hydrogen (H).
Tritium has atomic number(Z) 1 and mass number(A) 3.
p⁺(T) = 1; number of protons in the tritium.
A = n° + p⁺.
A(T) = 3; mass number of the tritium.
n°(T) = 3 -1.
n°(T) = 2; number of neutrons in tritium.
Isotopes are chemical elements with same atomic number, but different mass number (different number of neutrons), hydrogen, besides deuterium and tritium, has isotope protium.
Which are the products in this chemical reaction? 2C4H10 + 13O2 8CO2 + 10H2O A. 13O2 + 10H2O B. 8CO2 + 10H2O C. 2C4H10 + 13O2 D. 2C4H10 + 8CO2
Answer: The products in the given chemical reaction are [tex]8CO_2\text{ and }10H_2O[/tex]
Explanation:
Reactants are defined as the species which react in the reaction and are written on the left side of the reaction arrow.
Products are defined as the species which are produced in the reaction and are written on the right side of the reaction arrow.
For the given chemical equation:
[tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]
The reactants of the above reaction are [tex]2C_4H_{10}\text{ and }13O_2[/tex] and the products are [tex]8CO_2\text{ and }10H_2O[/tex]
Hence, the products in the given chemical reaction are [tex]8CO_2\text{ and }10H_2O[/tex]
Answer:
B
Explanation:
Reactants are defined as the species which react in the reaction and are written on the left side of the reaction arrow.
Products are defined as the species which are produced in the reaction and are written on the right side of the reaction arrow.
Which of the following will produce a precipitate?
a) Rh3+(aq) + K3PO4(aq)
b) Nb3+(aq) + Li2CO3 (aq)
c) Co2+(aq) + Zn(NO3)2 (aq)
d) K1+(aq) + Na2S (aq)
Answer: The correct answer is Option d.
Explanation:
Precipitation reaction is defined as the reaction in which an insoluble salt is formed when two solutions are mixed containing soluble substances. The insoluble salt settles down at the bottom of the reaction mixture.
For the given options:
Option a: [tex]Rh^{3+}(aq.)+K_3PO_4(aq)[/tex]The chemical equation follows:
[tex]Rh^{3+}(aq.)+K_3PO_4(aq.)\rightarrow RhPO_4(aq.)+3K^+(aq.)[/tex]
As, no solid product is getting formed, it will not form any precipitate.
Option b: [tex]Nb^{3+}(aq.)+Li_2CO_3(aq)[/tex]The chemical equation follows:
[tex]2Nb^{3+}(aq.)+3Li_2CO_3(aq.)\rightarrow Nb_2(CO_3)_3(aq.)+6Li^+(aq.)[/tex]
As, no solid product is getting formed, it will not form any precipitate.
Option c: [tex]Co^{2+}(aq.)+Zn(NO_3)_2(aq)[/tex]The chemical equation follows:
[tex]Co^{2+}(aq.)+Zn(NO_3)_2(aq.)\rightarrow Co(NO_3)_2(aq.)+Zn^{2+}(aq.)[/tex]
As, no solid product is getting formed, it will not form any precipitate.
Option d: [tex]K^{+}(aq.)+Na_2S(aq)[/tex]The chemical equation follows:
[tex]2K^{+}(aq.)+Na_2S(aq.)\rightarrow K_2S(s)+2Na^+(aq.)[/tex]
As, potassium sulfide is getting formed as a solid. It is considered as a precipitate.
Hence, the correct answer is Option d.
Which steps are important when designing and conducting a scientific experiment?
Hide the results from fellow scientists.
Identify the independent variable.
Eliminate all dependent variables.
Address any confounding variables.
Form a non-falsifiable hypothesis.
there more then 1 answer
Explanation:
When designing and conducting a scientific experiment then it is necessary to sequentially follows all the steps necessary for the experiment.
Also, it is required to identify independent variables, if any. On the other hand, it is required to address any confounding variables, so that it becomes mentioned the type or number of variables present.
Thus, we can conclude that when designing and conducting a scientific experiment:
Identify the independent variable.Address any confounding variables.What do the group 1 elements form when they react with oxygen?
Group 1 elements react with oxygen to form metal oxides. These oxides are highly reactive and upon contact with water, form alkaline hydroxides and release hydrogen gas.
Group 1 elements react with oxygen to produce metal oxides, which then react with water to form hydroxides.
Group 1 elements, also known as alkali metals, include elements like lithium (Li), sodium (Na), and potassium (K). These elements have a single electron in their outermost shell, making them highly reactive, especially with oxygen. When Group 1 elements react with oxygen, they form metal oxides that are typically white solids. The reaction of these oxides with water results in the formation of alkaline hydroxides, releasing hydrogen gas in the process. For instance, when lithium reacts with water, it forms lithium hydroxide and hydrogen gas. However, it's important to note that simply burning these metals in air will also produce mixtures of oxides and nitrides due to their high reactivity.
The reaction of Group 1 elements with oxygen is a fundamental chemical process that results in the formation of basic metal oxides, which further react with water to create hydroxides, useful in various chemical applications.
what class of organism is vital in the recycling of nutrients in the ecosystem?
The volume of an irregular object can be measured by
What is base in chemistry
Hello!
In chemistry, compounds can have one of two properties. Acidic and Basic.
To determine whether a compound/solution/test subject is basic or acidic, you need to look for the pH level. pH is a unit scale for your understanding.
1-6 on the pH scale means an item is acidic.
7 on the pH scale tends to be what we consider even ground as it matches the closest to the human bodies pH level.
Anything greater than 7 is considered basic.
Examples of basic solutions and compounds are many bleaches, milk of magnesia, ammonia, even limewater!
I hope this gives you an answer to your question.
In chemistry, a base is a substance that can either release hydroxyl ions (OH⁻) in solution or accept hydrogen ions (H⁺).
A base in chemistry can be defined from several perspectives. According to the Bronsted-Lowry theory, a base is a substance that can accept hydrogen ions (H⁺), which is equivalent to being a proton acceptor. Alternatively, the Lewis theory defines a base as an electron pair donor.
Common characteristics of bases are that they are slippery to the touch, have a bitter taste, and can change the color of indicators (such as turning red litmus paper blue). They also react with acids to form salts and water, and promote certain chemical reactions (base catalysis).
One of the most straightforward ways to identify a base is by its ability to release hydroxyl ions (OH⁻) in solution. These hydroxyl ions can then combine with hydrogen ions (H⁺) in the solution, leading to the formation of water (H₂O).
Although some substances we encounter in our routine lives are elements, most occur in the combined state
which is known as molecules/compounds.
A scientist conducts an experiment to determine how the CO2 levels in ocean water affect the number of plants that can grow in the ocean. What is the dependent variable?
CO2 level Number of plants Plant height Types of plantsThe dependent variable is 'Number of plants' which is the correct answer.
The independent variable is CO₂ levels in ocean water, however, the growth of plants in ocean water depends on the CO₂ levels. Higher CO₂ is level is conducive to the growth of plants.
Plants use CO₂ and water in photosynthesis to prepare food in the presence of light.
6CO₂ + 6H₂O + light energy = C₆H1₁₂O₆ + 6O₂.
Answer:Number of plants.
Explanation:
When any experiment is conducted then there are two variables in the experiment. One of the variable is independent variable that we can change according to the need of the experiment.
Then the result of the experiment is known as dependent variable which depends on the independent variable.
Here, the concentration of carbon dioxide can be changed and is known as independent variable but the number of plants that will grow in the given carbon dioxide concentrations is dependent variable.
Which of these is an example of a physical change
A. Breaking Bread
B. Baking Bread
C. Digesting Bread
D. Toasting Bread
A. Breaking Bread, because you can rip or cut it and it is still bread.
hope that helps :)
Answer:
a
Explanation:
Why do some types of batteries stay fresh longer if they are kept in a refrigerator? A. Cooling increases the surface area inside the batteries.
B. Cooling increases the concentration of the reactants in the batteries.
C. Cooling lowers the rate of the chemical reaction in the batteries.
D. Cooling is similar to adding a catalyst to the batteries.
Answer:
Cooling lowers the rate of the chemical reaction in the batteries.
Explanation:
When a battery is not in use and it may undergo some chemical changes which leads to decrease in its life (shelf life).
For example in case of Zinc battery, the zinc undergoes reaction with ammonia which deteriorate the cell or battery.
Now if we keep the battery in a cool place like refrigerator, the rate of chemical reaction will decrease (the rate of reaction generally decreases with decrease in temperature). Thus the battery stay fresh longer.
sodium has an atomic number of 38 and a mass number of 88 how many neutrons are in one atom of strontium
88
50
38
126
Neutrons and protons each weight approximately 1 unit, while electrons weigh almost nil.
The atomic number tells us the number of protons (and electrons) there are in each atom.
Thus the mass number (88) is the total of the number of neutrons (N) and protons (38).
Therefore the number of neutrons is N=(88-38)=50
Define and explain Resonance ?
Resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.
Frequencies at which the response amplitude is a relative maximum are known as the system's resonant frequencies or resonance frequencies. At resonant frequencies, small periodic driving forces have the ability to produce large amplitude oscillations, due to the storage of vibrational energy.
Imagine that Kevin can instantly transport himself between Planet X and Planet Y. Which statement could be said about Kevin in this situation? Kevin’s weight may change between Planet X and Planet Y. Kevin’s volume may change between Planet X and Planet Y. Kevin’s mass may change between Planet X and Planet Y. Kevin’s matter may change between Planet X and Planet Y.
Answer:
Kevin’s weight may change between Planet X and Planet Y.
Explanation:
Mass is the amount of matter contained in an object. Gravity is Earth’s pull of a body towards its centre.
Weight (W) is product of the mass (m) of the object and the force of gravity (g) acting on the object.
W = mg
The force of gravity may change between Plant X and Planet Y, and thus Kevin’s weight may change between Planet X and Planet Y.
Answer:
Kevin’s weight may change between Planet X and Planet Y.
Explanation:
yes jaja
Name the following Ionic Compound:
Fe2O3
(I believe this is Iron (III) Oxide)
It is Iron 2 (Fe2) and Oxygen 3 (O3). Hope this helps!
The chemical formula Fe₂O₃ corresponds to the ionic compound Iron (III) Oxide.
An ionic compound is a chemical compound composed of positively charged ions (cations) and negatively charged ions (anions) that are held together by electrostatic forces.
In this compound, Fe represents iron, and the Roman numeral III indicates the charge on the iron ion, which is +3. The symbol O represents oxygen.
Iron (III) Oxide is commonly known as rust and is a reddish-brown compound that forms when iron reacts with oxygen in the presence of moisture.
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HELP NEEDED ASAP PLEASE HELP
What could red litmus paper be used to determine?
If a solution is supersaturated.
If a solution is acidic.
If a solution is basic or neutral.
If a solution is acidic or neutral.
The range of all forms of radiant energy is given the name ?
The range of all forms of radiant energy is called the electromagnetic spectrum. It ranges from extremely long radio waves to extremely short gamma rays.
How does radiation differ from conduction?
A) Radiation can move through empty space to transfer heat; conduction cannot.
B) Radiation needs a medium in order for heat to transfer; conduction does not.
C) Radiation requires objects to have direct physical contact; conduction does not.
D) Radiation transmits heat by circulating particles in an object; conduction does not.
Answer:
The answer is A) Radiation can move through empty space to transfer heat; conduction cannot.
Explanation:
Answer: It is A (Radiation can move through empty space to transfer heat; conduction cannot)
Explanation:
Hematite is a naturally occurring mineral and a common form of iron ore. The following statements describe physical and chemical changes occurring to hematite. Which statement describes a chemical change? A. The hematite particles separate from each other but remain the same substance. B. The hematite particles rearrange to form a new substance. C. The hematite particles are mixed with particles of a different substance. D. The hematite particles vibrate more quickly when they are heated. E. The hematite particles are moved from one location to another location.
The correct answer is option B.
The hematite particles rearrange to form a new substance. This is an example of a chemical change.
A chemical change is an irreversible process wherein the atoms of a substance undergoes a rearrangement that causes it to from a new substance with unique chemical properties.
Answer:
B. The hematite particles rearrange to form a new substance.
Explanation:
PLATO
I DON'T UNDERSTAND... HIGH SCHOOL CHEMISTRY HELP???!?!! What happens to the half-life and mass of reactants broken down during a nuclear decay reaction?
A The half-life of reactants in a nuclear decay reaction remains constant over time, but the mass of reactants that are consumed decreases.
B The half-life of reactants in a nuclear decay reaction decreases over time, but the mass of the reactants that are consumed stays the same.
C The half-life of the reactants in a nuclear decay reaction remains constant over time, and the mass of the reactants that are consumed stays the same.
D The half-life of reactants in a nuclear decay reaction increases over time, and the mass of the reactants that are consumed increases.
Answer is: A The half-life of reactants in a nuclear decay reaction remains constant over time, but the mass of reactants that are consumed decreases.
1) For example, the half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.
2) Another example, half-life is the time required for a quantity to reduce to half its initial value.
Initial mass of sample: 30 grams.
After first half-life (60 days): 50% · 30 g ÷ 100% = 15 g.
After second half-life (120 days): 0.5 · 15 g = 7.5 g.
How do I balance Na + H2O = NaOH + H2
You have to combine each element on each side together.
You would do
1-Na-1 because there is 1 Na on each side
2-H-3 because there is 2 H on one side and 3 H on the other side
1-O-1 because 1 O on one side and 1 O on the other
Your final answer would be 2Na+2H2O-->2NaOH+H2
Hope I could help! :)
what is the elephant toothpaste
Elephant toothpaste is the term given to a chemical reaction that results in a large amount of foam, similar visually to toothpaste squeezed from a tube. It is not to be confused with actual toothpaste, which is a product used for oral hygiene containing abrasives, flavorants, and fluoride.
Explanation:Elephant toothpaste is a name commonly given to the chemical reaction that produces a large quantity of foam, reminiscent of toothpaste being squeezed out of a tube. It is not actual toothpaste and should not be used for oral hygiene. Instead, the name is a playful term referring to the visual similarity between the rapid foamy output and an imagined amount of toothpaste that would be suitable for an elephant.
On the other hand, actual toothpaste is a paste or gel used with a toothbrush to clean and maintain oral health. It contains abrasives to aid in plaque removal, flavorants like peppermint, and fluoride to prevent cavities. Various forms of fluoride, like sodium fluoride and stannous fluoride, are used in toothpastes. It's important to note that only actual toothpaste should be used for oral hygiene, not fun chemistry experiments like elephant toothpaste.
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