Answer:
225 mL of water must be added.
Explanation:
First we calculate how many HCl moles are there in 516 mL of a 0.191 M solution:
516 mL * 0.191 M = 98.556 mmol HClNow we use that number of moles (that remain constant during the dilution process) to calculate the final volume of the 0.133 M solution:
98.556 mmol / 0.133 M = 741 mLWe can calculate the volume of water required from the volume difference:
741 mL - 516 mL = 225 mL(Question) How many atoms are in 3 grams of Cu?
(20 points)
Answer: 2.85 x 10^22
Explanation:
We can use stoichiometry to convert grams to atoms.
*Important quantities*
Original amount of Copper: 3 grams
Molar mass of Copper: 63.5 grams
Avogadro's number: 6.022x10^23 atoms/formula units/molecules
Process - [tex]\frac{3gramCu}{1}[/tex]×[tex]\frac{1 mole Cu}{63.5 gCu}[/tex]×[tex]\frac{6.022x10x^{23} }{1 moleCu}[/tex] = 2.84503937×10^22
After taking sig figs into account, the answer needs to be rounded to 3 decimal places
Final answer: 2.85 x 10^22
6. Animals have many adaptations for survival. Describe each adaptation below, and explain how it could help an organism better survive in its environment.
a) camouflage
b) mimicry
c) venom
Is a mole equal to 1 molecules?
No, one molecule does not make up a mole. In chemistry, the terms "mole" and "molecule" are used interchangeably.
The word "mole" is used to describe a quantity that cannot be expressed in terms of grams or milligrams. A mole thus counts the quantity of atoms, ions, or molecules.
A molecule is a type of chemical that develops when multiple atoms are combined by chemical bonding. Electrical charge does not exist in molecules. A molecule's constituent atoms may come from the same element or from separate elements. Varying molecules have different ratios between these atoms. Molecules are a unit of measurement for the quantity of molecules in a system.
The primary distinction between a mole and a molecule is that a mole is a unit of measurement for amount whereas a molecule is an atomized chemical species.
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Which of the following molecules are polar: Cl2, CO2, BF3, NO, SO2, XeF4
Group of answer choices
O NO, SO2 only
O Cl2, CO2 only
O NO, XeF4 only
O BF3, XeF4 only
Only the molecules of NO, SO2 are polar. These chemicals are referred to as polar solvents since they have both positive as well as ends.
What does the chemical term "polar" mean?a structure where the density of electrons is unevenly distributed. Nonpolar refers to a structure where the density of electrons is more or more uniformly distributed. Numerous physical, molecular, and ecological properties of molecules are influenced by polarity, which can take many different forms.
Why are bonds polar?A polar molecule bond is one in which there is an electrostatic potential difference in between atoms of between 0.5 and 2.0. A polar covalent link is a type of covalent bond with which the atoms are attracted to electrons in uneven amounts, resulting in looked.
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Consider the unbalanced equation for the oxidation of butene. C4H8 + 6O2 Right arrow. CO2 + H2O For each molecule of C4H8 that reacts, how many molecules of carbon dioxide and water are produced?
Answer:
4 molecules of carbon dioxide (CO₂) and 4 molecules of water (H₂O)
Explanation:
The unbalanced chemical equation is:
C₄H₈ + 6 O₂ → CO₂ + H₂O
To balance the equation, we have to write a coefficient of 4 for CO₂ and a coefficient of 4 for H₂O, as follows:
C₄H₈ + 6 O₂ → 4 CO₂ + 4 H₂O
Now, we can see that 4 molecules of carbon dioxide (CO₂) and 4 molecules of water (H₂O) are produced for each molecule of C₄H₈.
What is true about the nature of light?
Select all that apply.
Light behaves as a wave, which is shown when it is passes through slits and produces a diffraction pattern.
Light can be reflected in different colors seen by the human eye.
Light is composed of small lines of color called photons.
Light behaves as a particle, which is shown when it is shines on a metal and produces current.
Does reactivity increase or decrease from left to right among elements in a period?
Period. As you move from either the left to the right, reactivity rises. Group reactivity diminishes from top to bottom.
As you move from left toward right across a period, responsiveness declines. Higher reactivity is caused by the ease with which electrons can be given or snatched away as you move further to the left as well as along the periodic chart.
This is because the size of both the atomic radius expands as the quantity of electronic energy does. reducing the attractiveness of other elements' valence electrons lowers reactivity.
It happens because there are more valence shells and less interaction among valence pairs of electrons. Consequently, the propensity to take electrons from some of the other atoms declines. Atoms get more electronegative as they move through a period.
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Classify the reaction in each of the following equations.
a. BaCl2 (aq) + K2CrO4 (aq) → BaCrO4 (s) + 2KCl(aq)
b. Si(s) + 2Cl2 (g) → SiCl4 (l)
Answer:
a) Double replacement
b) Synthesis
Explanation:
a) For A, we have two ionic reactants that form two ionic products, where the anion (or cation) is swapped. This is a characteristic of a double replacement reaction.
b) For B, two elements, this time two elements, react together to form one product that's unlike the reactants. This is a characteristic of a synthesis reaction.
List some Industrial plants and indicate the gaseous pollutants they emit
Answer:
Sources of air pollutants from the industry include: power generation plant, boilers, bleaching plants and caustic soda/chlorine plant. Pollutants include particulate matter, chlorine, sulfur dioxides, hydrogen sulfides, carbon dioxide, carbon monoxides and nitrous oxides.
Name one situation in which gravi- tational potential energy might be useful, and name one situation in which it might be dangerous.
Write a introduction base on the topic reproduction, male an female reproduction system
The ma le repr0 ductive system includes made up of internal organs such as the prostate gland, vas deferens, as well as ure thra as well as external geni talia like the pe nis, tes tes, as well as scrot um.
The health of something like the male reproductive system and the hormo nes secreted by the brain determine a man's fertility as well as sexual characteristics.
The human reproductive system would be the organ system primarily charged of creating and fertilizing gametes (eggs but rather sperm) as well as carrying a fetus. The gonads of both se xes create gametes.
The ov aries, fallopian tubes, uterus, cervix, as well as vagina are all parts of the female repro ductive system. It comprises the pe nis, prostate, as well as tes tes in men.
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Everyone!
Give a Question/Problem for Hot and Cold Compress Pillow
Thank you!!
Answer:
are u good at geometry math? their are some questions I didn't understand it PLEASE
Enzyme ______ bind to an enzyme to turn it off, thus preventing it from catalyzing a reaction. Multiple choice question
Enzyme Inhibitors bind to an enzyme to turn it off, thus preventing it from catalyzing a reaction.
An enzyme is a biological molecule that catalyzes chemical reactions in the cell. Enzymes work by lowering the activation energy required for a reaction to occur, making it more likely that the reaction will proceed. However, enzymes can also be inhibited, which means that their activity is reduced or stopped completely. This can happen for a variety of reasons, such as the presence of a specific molecule called an inhibitor.
Some inhibitors bind to the active site of the enzyme, preventing the substrate from binding and thus preventing the reaction from occurring. Other inhibitors bind to other parts of the enzyme, causing a conformational change that prevents the enzyme from working. Still, other inhibitors bind to enzymes and alter their activity by non-covalent interactions.
There are different types of inhibitors like competitive inhibitors bind to the active site of an enzyme and prevent substrate binding. Non-competitive inhibitors bind to a different site on the enzyme, causing a conformational change that makes the enzyme less active. Feedback inhibitors bind to the end product of a metabolic pathway, inhibiting the enzyme that catalyzes the first step of the pathway.
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2 points of the water molecule are the paired ______ and _______ electrons from the oxygen atom and ________ electron from each H atom
The other 2 points of the water molecule are the paired _________ electrons of the oxygen atom.
I get what the question is asking and I know general idea of the answer. I just can't for the life of me figure out what exact wording I am supposed to use that will fit these blanks
To solve this we must be knowing each and every concept related to chemical Compound. Therefore, The other 2 points of the water molecule are the paired two electrons from the oxygen atom and one electron from each H atom.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. The other 2 points of the water molecule are the paired two electrons from the oxygen atom and one electron from each H atom.
Therefore, The other 2 points of the water molecule are the paired two electrons from the oxygen atom and one electron from each H atom.
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What volume of a 0.120 M CaI2 solution would contain 0.078 mol of the solute? A. 35.0 mL O B. 65.0 mL O C. 350 mL O D. 650 mL
650 mL,In order to obtain the volume of solution necessary to provide a given amount of solute in moles, one needs to take the number of moles and divide by the solution concentration in molarity.
Molar concentration, also known as molarity, quantity concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per liter, denoted by the unit sign mol/L or mol/dm in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.
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How many atoms are indicated by the prefixes for each of the following items. drag each item to the appropriate bin
tetrisdide montui donde bro utracondo chloride triponthou Decode 1 atom 2 atoms 3 atoms 4 stoms 5 atoms 6 atoms
The prefixes you provided do not correspond to any known chemical element or compound. The prefixes used in chemistry typically come from Greek or Latin and indicate the number of atoms present in a molecule of a certain element or compound.
For example, "mono-" indicates 1 atom, "di-" indicates 2 atoms, "tri-" indicates 3 atoms, "tetra-" indicates 4 atoms, and so on. prefixes let me know if you have any other question
Mono - 1 - montui, chloride
di - 2 atoms - donde
tri - 3 atoms - triponthou
tetra - 4 atoms - tetrisdide
utra - 5 atoms - utracondo are prefixes .
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What particle limitation to the widespread of this reusable water bottles? Pls help someone
Answer: Plastic water bottles
Explanation:
If you use disposable water bottles, here are some important concerns you should know about how they’re made as well as the problems they cause for the planet, your health, and your wallet.
What volume will 25.0g ammonia occupy at stp
Answer:
The volume of 25 g O2 at STP is ~18 L.
Explanation:
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Select the correct answer. which gas is the most abundant greenhouse gas?
a. ozone
b. chlorofluorocarbon
c. carbon dioxide
d. methane
e. water vapor
E) The most significant and prevalent greenhouse gas is water vapor. Ozone, carbon dioxide, methane, nitrous oxide, and other gases are also present.
Which major source of greenhouse gases is it?Over the past 150 years, almost all of the rise in atmospheric greenhouse gases has been caused by human activities. Burning fossil fuels for transportation, electricity, and heating is the primary human activity in the United States that contributes to the emission of greenhouse gases.
Which four greenhouse gases have the greatest impact?The greenhouse gases on Earth warm the planet by storing heat in the atmosphere. Carbon dioxide, methane, nitrous oxide, and water vapor—all of which are found naturally—as well as fluorinated gases—which are made—are the main gases that cause the greenhouse effect.
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How are the boiling point and freezing point of a solvent affected when a solute is added?
O Both the boiling point and the freezing point decrease.
O Both the boiling point and the freezing point increase.
O The boiling point increases, and the freezing point decreases.
O The boiling point decreases, and the freezing point increases.
Answer:
the boiling point increases and the freezing point decreases.
Give three examples of fuels and briefly describe what they are used for in daily life
Examples: natural gas, coal, petroleum
Uses: Fuels are dense repositories of energy that are consumed to provide energy services such as heating, transportation and electrical generation. Even though most fuels ultimately get their energy from the sun (see energy conservation) they are usually considered to be a primary energy source.
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Entropy and the inefficiency of energy transfer are part of __________________. the first law of thermodynamics the second law of thermodynamics the third law of thermodynamics system resiliency feedback systems
Entropy and the inefficiency of energy transfer are part of the Second Law of Thermodynamics.
The first law of thermodynamics states that neither creation nor destruction of energy is possible. The universe becomes more entropic when a spontaneous process occurs, according to the second law of thermodynamics. Thermodynamics' third law: The entropy of a perfect crystal is 0 at absolute zero Kelvin. The overall entropy of a system may only ever increase or stay constant during spontaneous processes, according to the second law of thermodynamics. If the physical process is irreversible, the overall entropy of the system and its surroundings must increase. For a process to be irreversible, the final entropy needs to be higher than the starting entropy: Sf > Si (irreversible process). The overall entropy of a system and its surroundings can remain constant when a system is in thermodynamic equilibrium or undergoing a reversible process. The second law is sometimes known as the Law of Increased Entropy.
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What is the relative rate of diffusion of CH4 and NO2?
Answer:
=32×1632×√1632=34√2.
Explanation:
This energy diagram shows the allowed energy levels of an electron in a certain atom or molecule: energy Use this diagram to complete the table below. Which is the ground state? (pick one) How many excited states are there? How many lines are in the absorption line spectrum? Which transition causes the absorption line at the shortest wavelength? Which transition causes the absorption line at the longest wavelength?
The transition causing the absorption line at the longest wavelength is the transition from -2 to +2.
Ground State: -2
Number of Excited States: 4
Number of Lines in the Absorption Line Spectrum: 8
Transition Causing Absorption Line at Shortest Wavelength: -3 to -2
Transition Causing Absorption Line at Longest Wavelength: -2 to +2
The ground state is the state at the bottom of the diagram, which is -2.
There are 4 excited states, which are -3, -2, +1, and +2.
There are 8 lines in the absorption line spectrum, which are the 4 transitions from the ground state to the excited states, and the 4 transitions from the excited states back to the ground state.
The transition causing the absorption line at the shortest wavelength is the transition from -3 to -2.
The transition causing the absorption line at the longest wavelength is the transition from -2 to +2.
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yousab cycles at an average speed of 12 km/h. how far has he travelled if he cycles for 2 hours
Answer:
24 km
Explanation:
(12 km/hr)(2 hrs) = 24 km
Please help, I have tried everything that I can think of
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, theoretical yield of Al[tex]_2[/tex]O[tex]_3[/tex] is 136g.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
4AI + 3O[tex]_2[/tex]→ 2Al[tex]_2[/tex]O[tex]_3[/tex]
moles of Al =54/26=2.07
moles of O[tex]_2[/tex]=64/32=2
Since oxygen is limiting reagent, so product will be according to oxygen
Theoretical yield of Al[tex]_2[/tex]O[tex]_3[/tex]=136g
Therefore, theoretical yield of Al[tex]_2[/tex]O[tex]_3[/tex] is 136g.
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What is the molarity of a solution that contains 2.21 moles of MgBr2 in 2.93 L of solution?
Answer:
0.754M MgBr2
Explanation:
Molarity = Moles/Volume(liters)
2.21/2.93 = 0.754M MgBr2
Iron objects such as storage tanks and underground pipelines can be protected from corrosion by connecting them through a wire to a piece of : Ag
Pb
Sn
Mg
Cu
Iron objects such as storage tanks and underground pipelines can be protected from corrosion by connecting them through a wire to a piece of Mg.
General corrosion happens when the majority or even all atoms on such a metal surface become oxidized, causing the surface to corrode completely. The majority of metals were easily oxidised, which means they frequently lose oxygen electrons (among other elements) in the air either in water. Oxygen joins with the metal to produce an oxide as it becomes reduced (gains electrons).
A refined metal usually transformed naturally by corrosion into a safer stable chemical form, including its oxide, hydroxide, and sulphide. By reacting chemically and/or electrochemically with their surroundings, materials slowly degrade. Additionally, it gradually eliminates the element using chemical processes.
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A solid-solid solution is called a(n)
Answer: Alloy
Explanation:
How does glycolysis make 32 ATP?
Both anaerobic and aerobic conditions can result in glycolysis. Pyruvate joins the citric acid cycle under aerobic conditions and proceeds through oxidative phosphorylation, which results in the net synthesis of 32 ATP molecules.
What is an example of anaerobic activity?Anaerobic exercises require small bursts of energy and are finished rapidly while exerting maximum effort. Examples include jumping, jogging, and hard weightlifting. Your breathing and heart rate alter as you engage in aerobic vs anaerobic activities. During aerobic workouts, oxygen is your major source of energy.
What exactly does it mean to be anaerobic?Anaerobic means "without oxygen," whereas aerobic indicates the existence of oxygen. Both are important for your overall health since they put your body through different difficulties. Anaerobic exercise consists of short bursts of high-intensity activity that do not demand your body to consume oxygen as it would during cardio (or aerobic) exercise.
Here,
Glycolysis can occur under both anaerobic and aerobic settings. Under aerobic circumstances, pyruvate enters the citric acid cycle and goes through oxidative phosphorylation, resulting in the net production of 32 ATP molecules.
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