C=n/V
V=n/C=0.34/0.0606=5.61L
How is 0.00235 expressed in proper scientific notation?
A. 2.35 × 10-3
B. 0.235 × 10-2
C. 2.35
D. 2.35 × 103
Answer:
A
Explanation:
it's always a _.___x10^____
You move the decimal three places to the right for this one, so negative 3
Any number less than 0 will have a negative exponent beside the base number 10
The correct option is: A. The number 0.00235 in proper scientific notation is written as 2.35 × 10⁻³ because the decimal moves three places to the right, making the exponent -3.
To express 0.00235 in proper scientific notation, follow these steps:
Move the decimal point so that there is only one non-zero digit to its left. For 0.00235, this would be 2.35.Count the number of places the decimal has moved. Here, it has moved 3 places to the right.Since the decimal moved to the right, the exponent will be negative. The final scientific notation is 2.35 × 10⁻³.Therefore, the correct answer is A. 2.35 × 10⁻³.
Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. Potassium (K): 1s22s22p63s23p64s1
Answer:
The number of core electrons = 18 electrons.
The number of valence electrons = 1 electron.
Explanation:
The core electrons are the electrons in the inner shells (1s²2s²2p⁶3s²3p⁶).∴ the number of core electrons = 18 electrons.
The valence electrons are the electrons in the outermost shell (4s¹).
∴ the number of valence electrons = 1 electron.
Answer:
18 core electrons
1 valence electron
Explanation:
In the periodic table, potassium stands at the head or beginning of the fourth period. It is found in group 1. The third period ends with argon having 18 electrons. This implies that potassium should have at least 18 core electrons. Since it is found in group 1 having only 1 valence electron, it is expected to also have one valence electron.
Its electron configuration summarizes these statements above; 1s22s22p63s23p64s1
There are 18 core electrons and one valence electron in the outermost 4s1 orbital (the fourth shell)
Which shows the correct order of steps during the formation of an ionic bond?
a) lons are attracted to each other - Electrons are transferred -- An ionic compound forms
b) An ionic compound forms – lons are attracted to each other Electrons are transferred
c) Electrons are transferred – lons form lons are attracted to each other
d) lons form – Electrons are transferred - lons are attracted to each other
Answer: c.
Electrons are transferred → Ions form → Ions are attracted to each other
have a great day
Explanation:
Answer:
Electrons are transferred – lons form lons are attracted to each other
Explanation:
Let us use the formation of NaCl as an example. Sodium ion forms by transferring one electron to chlorine and chloride ions form by accepting this one electron from sodium hence electron transfer must be the first step in ionic bond formation. Once electrons are donated and received, ions are formed which are immediately attracted to each other to form the ionic compound.
The reactants of two chemical reactions are shown.
Reaction 1: HCl and NaOH
Reaction 2: Cu and AgNO3
Which reaction is likely to be a redox reaction?
A) Reaction 1, because hydrogen and hydroxide atoms will be formed.
B) Reaction 1, because all ions formed will retain their electrostatic charges.
C) Reaction 2, because the electrostatic charge on copper ion will change.
D) Reaction 2, because the charges on each side of the equation will be unequal.
Answer:
C)
Explanation:
The first step is to write the whole reactions:
A)[tex]HCl~+~NaOH~->~H_2O~+~NaCl[/tex]
B)[tex]Cu~+~AgNO_3~->~Cu(NO_3)_2~+~Ag[/tex]
In A) reaction we will have an acid-base reaction (double replacement reaction). In this reaction, the oxidation number is the same for all atoms on both sides of the reaction.
In B) the oxidation number of Cu will change from zero to +2 and the oxidation number of Ag will change from +1 to zero. So, the Cu will be oxidized and the Ag will reduce. So, if we have a redox reaction for B) the charge must be equal on both sides.
What is critical mass?
the smallest mass of any material that can stop a chain reaction
the greatest mass of any material that can stop a chain reaction
the smallest mass of material that can sustain a chain reaction
the greatest mass of material that can sustain a chain reaction
Answer:
the smallest mass of material that can sustain a chain reaction
Explanation:
Critical mass refers to the smallest possible mass of a fissionable material that can sustain a chain reaction
Answer:
The answer is C.
Explanation:
Critical mass is the smallest mass of material that can sustain a chain reaction.
Hope this helps you, and have a nice day! :)
Explain how cells use digested food in your own words
Answer:
The digestive system uses mechanical and chemical methods to break food down into nutrient molecules that can be absorbed into the blood. ... Some animals use intracellular digestion, where food is taken into cells by phagocytosis with digestive enzymes being secreted into the phagocytic vesicles.
Explanation:
Digestion is crucial for breaking down meals into vitamins, which the frame uses for energy, growth, and cellular repair. food and drink need to be modified into smaller molecules of vitamins before the blood absorbs them and incorporates them into cells all through the frame.
What takes place in the digested meals?The small gut absorbs the maximum of the vitamins in your food, and your circulatory system passes them on to different components of your body to keep or use. Special cells help absorb vitamins across the intestinal lining into your bloodstream.
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_____are charged atoms or groups of atoms. Compounds Ions Molecules Elements
Answer:
Ions
Explanation:
because they contain positive and negative charges
The grouped atoms with charges are called ions.
Explanation:When an atoms losses electron, then it forms positive ion or cation whereas when an atoms losses electron, then it forms negative ion or anion. The attraction between two ions leads to formation of the ionic bond.
There are many types of ions which includes monoatomic ions which contains one atoms and polyatomic ions which contains two or more atoms. When atoms are converted into ions, then the atom is undergoing ionization process.
2. Which balanced equation represents an oxidation-reduction reaction?
A) H3PO4 + 3KOH →K3PO4 + 3H20
B) NH3(g) + HCl(g) →NH4Cl(s)
C) Fe(s) + S(s) →FeS(s)
D) Ba(NO3)2 + Na2SO4 →BaSO4 + 2NaNO3
Answer:
C) Fe(s) + S(s) →FeS(s)
Explanation:
What would happen to a volleyball left outside in the winter?
O
O
O
O
A. It would expand.
B. It would lose air.
C. It would shrink.
D. It would explode.
Answer:
it would shrink.
Explanation:
it doesnt loose air, but as the air gets colder it hits the sides less. it eventually goes flat
Volleyball left outside in the winter would lose air. The correct option is option B.
When a volleyball is left outside in the winter, the temperature drop can cause the air inside the ball to contract. As a result, the air pressure inside the ball decreases, causing it to lose air. This can lead to a deflated or partially deflated volleyball. It is important to note that extreme temperature changes or freezing temperatures could potentially cause damage to the ball, but the most immediate and likely effect would be the loss of air pressure.
Hence, the volleyball loose air when left outside.
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In an investigation that uses the scientific method, which step immediately follows making a hypothesis?
O summarizing the results
O asking a question
O making observations
designing an experiment
Mark this and retum
Save and Exit
Next
Submit
Answer:
Designing an experiment
Explanation:
After forming a hypothesis you need to prove it, so you must design an experiment to do so.
Answer:
D) Designing an Experiment
Explanation:
After you write your hypothesis, you would design your experiment.
Summarizing results comes much later, after the experiment is already conducted.
Asking a question comes prior to the hypothesis.
Making observations comes during the experiment.
You must design the experiment before you can make observations or summarize results.
at 450 mm Hg a gas has a volume of 760 L, what is its volume at standard pressure
Answer:
450.0 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have different values of P and V:(P₁V₁) = (P₂V₂).
V₁ = 760.0 L, P₁ = 450.0 mm Hg,
V₂ = ??? L, P₂ = 760.0 mm Hg (standard pressure = 1.0 atm = 760 mm Hg).
∴ V₂ = (P₁V₁)/(P₂) = (760.0 L)(450.0 mm Hg)/(760.0 mm Hg) = 450.0 L.
What type of radiation is emitted when polonium-212 forms lead-208?
Answer:
Alpha radiation
Explanation:
Polonium-212 decays to lead-208 by emission of an alpha particle according to the following equation.
²¹²₈₄ Po →²⁰⁸₈₂ Pb +⁴₂ He + Energy.
Te alpha particle is a helium particle. It has 2 protons and 2 neutrons.
16. In a reaction that has reached equilibrium,
a. The forward and reverse reactions are occurring at the same rate.
b. The reactants and products are in equal concentrations.
C. The forward reaction has gone further than the reverse reaction.
d. There are equal numbers of atoms on both sides of the equation.
e. A, B, and D are correct.
Answer:
i think b
Explanation:
Answer:
None of the above.
Explanation:
a, c, and d are correct.
a. In a reaction at equilibrium, the forward and reverse reactions are occurring at the same rate.
c. If the position of equilibrium lies to the right, the forward reaction has "gone further" than the reverse reaction.
d. Even if the position of equilibrium is far to the right, the balanced equation for the equilibrium has equal numbers on each side of the equation. For example, in the equilibrium reaction 2H₂ + O₂ ⇌ 2H₂O, the position of equilibrium is far to the right but there are equal atoms on each side of the reaction.
b. is wrong. It is exceptionally rare for reactants and products to have the same concentrations at equilibrium.
how many prime numbers are there between 0 and 75
Answer:
There are 21 prime numbers between 0 and 75.
Explanation:
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73
Answer:
21
Explanation:
There are 21 prime numbers between 0 and 75.
These include:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73.
Which of the following particles has a negative charge?
neutrino
positron
gamma ray
all of the above
none of the above
Answer:
gamma ray
Explanation:
Answer:
None of the above.
Explanation:
We have to find the particle which have negative charge.
1.Neutrino
It has no negative charge.The charge on neutrino particle is zero.Therefore,It is neutral particle.
Hence,option A is false.
2.Positron
It has no negative charge.The charge on the particle is +1 e.Therefore, it is false.
3.Gamma ray
It is a from of electromagnetic radiation.It has charge 0.Therefore, it has no negative charge.
Hence, option 3 is false.
Answer:None of the above.
In any engineering design problem, the first step is to understand the problem and identify one or more possible solutions. In this task, you’ll analyze the problems you face as the chemical engineer challenged with setting up the ammonia-making process. Recall the chemical equation for producing ammonia:
N2 + 3H2 ⇌ 2NH3 + energy
How can you change the chemical equilibrium to benefit the company? What benefits will be realized?
Answer:
rising pressure and decreasing temperature
Explanation:
Reversible reactions have a bit practical interest, but in some cases the technological benefit or profitability of production requires a shift in the equilibrium of a reversible reaction.
Increasing pressure
With increasing pressure on this system, the concentration of substances increases. In this case, the balance will shift towards smaller volumes. On the left side of the equation, two volumes of nitrogen react with one volume of hydrogen. On the right side of the equation there are two volumes of ammonia, i.e. the number of volumes on the right side of the equilibrium reaction is less than on the left and, therefore, with increasing pressure, the reaction equilibrium will shift to the right.
Decreasing temperature
When the temperature rises, the equilibrium shifts towards the endothermic reaction, and when the temperature decreases, towards the exothermic reaction and the reaction given above is the exothermic.
To optimize the yield of ammonia in the Haber process, increasing system pressure shifts the chemical equilibrium towards producing more NH3. This results in a higher production rate and economic efficiency, aligning with industrial goals.
Explanation:In the context of chemical engineering, changing the chemical equilibrium in the production of ammonia (NH3) from nitrogen (N2) and hydrogen (H2) gases can highly benefit a chemical company. The Haber process is grounded in the reaction: N2 + 3H2 ⇌ 2NH3 + energy. By adjusting conditions such as pressure and temperature, the yield of ammonia can be increased according to Le Chatelier's Principle.
To shift the equilibrium towards the formation of more NH3, increasing the pressure of the system is effective because the reaction results in a decrease in the number of gas particles. According to the balanced chemical equation, we start with 1 mole of nitrogen and 3 moles of hydrogen to get 2 moles of ammonia. Since the reaction produces fewer gas particles as products, an increase in pressure will favor the production of ammonia, thus potentially increasing the yield and efficiency of the process.
Increasing the pressure is also practical considering industrial production constraints. The benefits of manipulating the chemical equilibrium in this manner include increased production rates and improved economic efficiency, as higher yields of ammonia mean more effective use of feedstock gases, which contributes to cost savings for the company.
What does the energy hill represent on an energy diagram?
Answer:
A
Explanation:
Which statement best describes the oxidation numbers of the atoms found in magnesium chloride?
A. Magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number.
B. Magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number.
C. Magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number.
D. Magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.
Answer- The correct choice of answer out of all would be option C.
Explanation
The given substance magnesium chloride made out of combination of chlorine and magnesium is a compound. Where magnesium has two positive ions and chlorine has two negative ions which trigger the reaction.
Hence the oxidation of the 2 positive ions of Magnesium takes place and reduction of the Negative Ion chlorine has to offer attract and stabilize each other by forming the compound .
Identify the parts of the energy diagrams.
energy released
energy absorbed
reactants
products
HELP!!!!!!!
Energy release is exothermic reaction whiles energy absorb is endothermic reaction
Explanation:
Exothermic reaction is when the reactant is above the product while endothermic the product is below the reactant in the diagrams we have some part as activation energy
An object of mass 10.0 KG and volume 1000 ML and density 10 G/ML sinks in water who’s density is 1.0 G/ML. What is the mass of the water which has been displaced in kilograms
Answer:
1000 grams or 1 kg
Explanation:
All that matters for this question is the volume of the object (1000 mL) and that the density of the object is more than the density of water.
Since the density of water is 1 gm/ mL and 1000 mL have been displaced, the answer is 1000 grams or 1 kg. You can actually calculate this from a formula.
density = mass / volume
density = 1 gram/ml
Volume = 1000 mL
mass = ?
mass = volume * density.
mass = 1000 mL * 1 gram / mL
mass = 1000 grams
Notice how you are focusing on the volume of the object and the mass of the water.
PLEASE PLEASE PLEASE HELP WILL GIVE BRAINLIEST + 60 POINTS !!!!!
Professor Bothwell determined from the wrapper the number of calories in a candy bar. He then burned the entire candy bar and measured the amount of heat released. His experiment was most likely designed to demonstrate _________.
A the law of conservation of matter
B the law of disorder
C the law of conservation of energy
D the law of constant composition
His experiment was most likely designed to demonstrate the law of conservation of energy, which states that energy the total energy of an isolated system remains constant; it is said to be conserved over time. This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another. So, he was trying to demonstrate that the amount of heat energy released was equal to the number of calories (amount of energy) stated to be in the candy bar.
You have 100ml of a 12m solution of HCI, and you need to dilute it to 1.5m for an experiment. How many liters will your new solution be? Show your work
Please answer asap!!!
Answer:
0.8 liters.
Explanation:
By proportion the volume of the new solution will be (12/1.5) * 100 ML
= 800 ml = 0.8 liters.
The atoms in a ____ have a definite volume, but move quickly enough to overcome the forces of attraction between them.
A. Solid
B.Liquid
C.Gas
Answer:
liquid
Explanation:
The atoms in a liquid have a definite volume, but move quickly enough to overcome the forces of attraction between them.
What is atoms ?The smallest component of ordinary stuff that makes up a chemical element is very much an atom.
What is liquid?A liquid would be an incompressible flow fluid which thus takes on the shape of the container while maintaining an even volume regardless of pressure.
Therefore, the atoms in a liquid have a definite volume, but move quickly enough to overcome the forces of attraction between them.
To know more about atoms and liquid
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which best explains the effect of chemicals on the environment ?
The correct option is D.
Chemicals can have both beneficial and harmful effects on the environment, depending on their type, use, and context.
The effect of chemicals on the environment is a complex and multifaceted issue, and it cannot be simplified into a single option. Instead, the most accurate explanation is that:
Chemicals can be helpful or harmful to the environment.
Here's a detailed breakdown of this answer:
1. Harmful Effects of Chemicals:
Many chemicals, such as industrial pollutants, pesticides, and certain heavy metals, can have detrimental impacts on the environment. These substances can contaminate air, soil, and water, leading to pollution, ecosystem disruption, and harm to wildlife.Some chemicals can bioaccumulate in organisms, leading to adverse health effects for both wildlife and humans when they enter the food chain.2. Beneficial Effects of Chemicals:
Not all chemicals are harmful to the environment. Some chemicals are essential for various natural processes and are used in agriculture, water treatment, and other industries to improve living conditions.For example, fertilizers and plant nutrients help enhance crop production, and certain chemicals are used in wastewater treatment to purify water before it is released back into the environment.3. Context Matters:
The impact of chemicals on the environment depends on the specific chemical, its concentration, how it's used, and the environmental conditions.Regulatory agencies and environmental scientists work to assess and manage the risks associated with various chemicals to minimize their harmful effects.In conclusion, chemicals can have a range of effects on the environment, and their impact can be both beneficial and harmful. It's essential to consider the specific chemical and its application within a broader environmental context to make informed decisions about their use and regulation.
The complete question is here:
Which best explains the effect of chemicals on the environment?
A. Chemicals are only harmful to the environment.
B. Chemicals do not affect the environment.
C. Chemicals are only helpful to the environment.
D. Chemicals can be helpful or harmful to the environment.
Energy release is to condensation as energy input is to _________.
A. deposition
B. sublimation
C. freezing
D. dispersion
Answer:
sublimation
Explanation:
the other choices release energy
Hey mate here's your answer
Ans: B, Sublimation. This is because you must input energy in order to get a solid to go directly to a gas while the other ones release energy (and dispersion has nothing to do with these at all)
hope so the following may help you thanks
When ions having a positive charge form bonds with ions having a negative charge, the charge on the resulting compound is negative.
Answer:
See below.
Explanation:
No, the resulting charge will be 0.
For example Na+ + Cl- ---> NaCl.
The sodium chloride formed is neutral ( NO CHARGE).
Contrary to the original assertion, the charge on an ionic compound is not negative but rather neutral, as the total positive charges of the cations balance the total negative charges of the anions. Ionic compounds are formed when cations and anions bond due to electrostatic attraction, resulting in a neutral compound.
When ions with a positive charge, known as cations, form bonds with ions with a negative charge, known as anions, the result is an ionic compound. Contrary to the statement in the question, the overall charge on the resulting ionic compound is not negative. Instead, ionic compounds are electrically neutral because the total number of positive charges and negative charges balance each other out.
Ions form when atoms gain or lose electrons. A cation is formed by the loss of electrons and maintains a positive charge, while an anion is created by the gain of electrons and carries a negative charge. The ionic formula represents a balance of the total positive and negative charges so that the compound is electrically neutral.
For example, in sodium chloride (NaCl), sodium (Na+) is the cation with a +1 charge and chloride (Cl-) is the anion with a -1 charge. The charges balance out (+1-1=0), and the resulting compound is neutral. Similarly, in magnesium oxide (MgO), magnesium has a +2 charge and oxygen has a -2 charge, which also balance out to give a neutral compound.
The electrostatic attraction between these oppositely charged ions forms what is known as an ionic bond. Ionic bonds are strong and result in the formation of a structured ionic lattice or network. This attraction is explained by the principle that opposite charges attract, a fundamental concept in electrostatics.
What is an example of a physical property?
Answer:
Malleability
Explanation:
13. A covalent bond between two atoms is likely to be polar if:
a. One of the atoms is much more electronegative than the other.
b. The two atoms are equally electronegative.
c. The two atoms are of the same element.
d. The bond is part of a tetrahedrally shaped molecule.
e. One atom is an anion.
A covalent bond between two atoms is likely to be polar if one atom is more electronegative than the other. This happens because the more electronegative atom pulls the shared electrons closer to itself, resulting in a polar covalent bond.
Explanation:A covalent bond between two atoms is likely to be polar if one of the atoms is much more electronegative than the other. A covalent bond is formed when two atoms share electrons. However, when one atom is significantly more electronegative, it pulls the shared electrons closer to itself, creating a partial negative charge. The other atom then has a partial positive charge, creating a polar covalent bond.
For example, in a water molecule (H2O), the oxygen atom is more electronegative than the hydrogen atoms, resulting in a polar covalent bond. The other options given (b, c, d, e) are either special conditions of a covalent bond or not related to the polarity of a bond at all.
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what does the process of natural selection involve
Answer:
Only the organisms best adapted to their environment tend to survive and transmit their genetic characters in increasing numbers to succeeding generations while those less adapted tend to be eliminated.
Explanation:
According to Darwin's Theory of Evolution.
Hope this helped.
Final answer:
Natural selection is the process by which organisms with traits that better enable them to adapt to their environment tend to survive and reproduce. It acts on the population's heritable traits, selecting for beneficial alleles and against deleterious alleles.
Explanation:
Natural selection is the process by which organisms with traits that better enable them to adapt to their environment tend to survive and reproduce in greater numbers. It acts on the population's heritable traits, selecting for beneficial alleles that increase their frequency and selecting against deleterious alleles. Natural selection is not random, as it favors variants that are better able to survive and reproduce.
Fill in the coefficients that will balance the following reaction:
a0Cr2(SO4)3 + a1AgNO3 -> a2Cr(NO3)3 + a3Ag2SO4
Answer
Explanation:
can you please put it in boxes so i can find out the answer
Answer:
a0=1
a1=6
a2=2
a3=3
Explanation:
We have to start with the reaction:
[tex]Cr_2(SO_4)_3~+~AgNO_3~->~Cr(NO_3)_3~+~Ag_2SO_4[/tex]
We have to start with "[tex]Cr[/tex]". If we want to balance Cr we have to obtain 2 on both sides. Therefore we have to add a "2" on the right side, so:
[tex]Cr_2(SO_4)_3~+~AgNO_3~->~2Cr(NO_3)_3~+~Ag_2SO_4[/tex]
Then we can balance "[tex]NO_3[/tex]" as a whole. We have 6 on the right, we have to have the same amount on the left side, so:
[tex]Cr_2(SO_4)_3~+~6AgNO_3~->~2Cr(NO_3)_3~+~Ag_2SO_4[/tex]
Then we can balance "[tex]Ag[/tex]". We have 6 on the left, so we have to have the same amount on the right if we already have 2 we have to put a · in front (on the right side) to obtain in total 6, so:
[tex]Cr_2(SO_4)_3~+~6AgNO_3~->~2Cr(NO_3)_3~+~3Ag_2SO_4[/tex]
Finally, when we add this last number the [tex]SO_4[/tex] we will have 3 on both sides. Therefore the reaction is already balanced.