A 22.2 g sample of gold with a density of 0.01932 kg/cm3 will occupy a volume of 1.1491 cm3.
Density, denoted by ρ, of a substance is its mass per unit volume. It shows the ratio between a substance mass and the volume it occupies. To solve for density, the formula is given by
ρ = mass / volume
Given a substance density, we can compute for its mass or volume using the same formula and vice versa.
But before inputting the values, convert the mass from g to kg to match the unit of density. (1 kg = 1000g)
mass = 22.2 g = 22.2 / 1000 = 0.0222 kg
To compute for the volume a sample of gold occupies,
volume = mass / ρ
where mass = 22.2 g = 0.0222 kg
ρ = 0.01932 kg/cm3
volume = 0.0222 kg / 0.01932 kg/cm3
volume = 1.1491 cm3
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Breaking a(n) _____ of an element into smaller particles will change its properties -- it would no longer be that element.
The answer would be an atom.
Atom : An atom is a tiny piece of a matter that unparalleled defines a chemical element.
An atom comprise of a mid nucleus that is neighbouring by one or more negatively charged electrons. The nucleus is positively charged and consist one or more relatively bulky particles known as protons and neutrons.
It is the littlest unit of an element.
Cannot be made or annul in a chemical reaction.
Atoms of various elements have various masses and chemical attributes.
Atoms merged in the ratio of compact whole numbers to form compounds.
Characteristics of an atom : atomic number, mass number and net charge.
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An atom is composed of a central nucleus which is surrounded by which orbiting particles? multiple choice question.
Electron are the orbiting particles, by which an atom is surrounded by.
What is electron?Unattached or attached to an atom, an electron is a negatively charged subatomic particle (not bound). One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom.
An atom's nucleus is made up of electrons, protons, and neutrons. The positive charge of a proton balances out the negative charge of an electron. An atom is in a neutral state if its protons and electrons are equal in number.
They have a mass that is considerably lower, exist outside of the nucleus, and display both wave- and particle-like properties. Since an electron is also a fundamental particle, it is unreinforced and unbroken.
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6. Hydrogen bonds are also known as
Answer:
hydrogen bonds are also known as electrostatic dipole interaction
What is the mass of an object with a density of 1.35 g/ml & a volume of 24 ml?
The mass of an object with a density of 1.35 g/ml & a volume of 24 ml is 32.4 g/ml.
What is mass?
Mass is the quantity of matter in a physical body.
The product of the molar mass of the compound and the moles of the substance are defined as mass.
Density is the mass per unit volume. Volume is the space taken by an object. Density, mass, and volume are interrelated to each other.
Given, that the density is 1.35 g/ml
The volume is 24 ml
The formula is
mass = volume x density
mass = 24 x 1.35 = 32.4
Thus, the mass of the object is 32.4 g/ml.
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Microscale reactions involve reaction mixtures with volumes___. some benefits of microscale chemistry are:____.
Microscale reactions involve reaction mixtures with volumes of 5 ml or less than 5 ml.
The benefits of microscale chemistry are as :
reduction in time for the experiment.cost-efficient.fewer safety hazards .less waste generation.Microscale reactions, delay with extremely small amounts of reagents and solvents, which reflects in the name, the reactions mainly work with 300 mg of compounds and solvent with volumes of 5 ml or less than 5 ml.
The benefits of such kind of chemistry are such as the first there is the involvement of less time in conducting the procedure, it allows repetition if something fails, second beacuse of usage of less chemical, lesser use of glassware of it is cost efficient, next there is a reduction in safety hazards such as possible explosions, and it efficient as it leads to minimizing in the quantity of waste.
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Which of these is a chemical change?
OA lake freezes solid.
O A copper bar is rolled into a flat sheet.
O Gravel, sand, and water are mixed.
O Vinegar bubbles when baking soda is added.
Answer:
Vinegar and baking soda
Explanation:
The others are physical changes, not chemical changes. This is because they do not change chemical properties or undergo a reaction.
However, when vinegar and baking soda are added together, it is a chemical change, because there is not only a reaction, but a change in its properties. Hopefully this helps!
Rick is a biologist who hypothesized that squid would swim faster in warm water than in cold water. rick conducted his experiment. he discovered that squid swim at the same rate in warm and cold temperatures. what should rick do next?
Scientific investigations can be used to reach the solution to the problem. The hypothesis of the experiments can be performed and the results and findings should be reported. Thus, option A is correct.
What is Scientific investigation?Scientific investigations have been defined as the series of steps that are used to solve the question and test the hypothesis to reach the solution. It uses logical means to experiment and research the topic.
After conducting an experiment the observed data, results, and findings must be reported so the process and the technical results can be used to define the issue or the problem that acts as a conclusion.
Therefore, option A. Rick must report his findings.
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Your question is incomplete, but most probably your options were,
A. Report his findings.
B. Throw away his experiment notes.
C. Report that squid swims faster in warm water.
D. Change his hypothesis.
H2PO4 -1 has a pKa of 6.86. If the concentration of H2PO4 -1 is 0.422 mM and the concentration of H1PO4 -2 is 0.068 mM what is the pH of the solution?
The pH of the solution is 6.07.
pKa = 6.86; the acid equilibrium constant
c(H₂PO₄⁻) = 0.422 mM; concentration of the acid
c(HPO₄²⁻) = 0.068 mM; concentration of the salt
Henderson–Hasselbalch equation for the buffer solution:
pH = pKa + log(c(HPO₄²⁻)/c(H₂PO₄⁻))
pH = 6.86+ log (0.068 mM/0.422 mM).
pH = 6.86 + log0.161.
pH = 6.86 - 0.79
pH = 6.07; potential of hydrogen
pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.
When pH is less than seven (pH<7), solution is acidic..
When is equal seven (pH = 7), solution is neutral.
When pH is greater than seven (pH > 7), solution is basic.
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Convert a speed of 5.70 km/s to units of meter per hour. show the unit analysis by dragging the conversion factors into the unit factor slots
The speed of 5.70 km/s converted into meters per hour would be 20520000 meters/hour.
What is a unit of measurement?
A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
As given the speed is 5.70 km/s
1 km = 1000 m
5.7 km = 5700 m
3600 s = 1 hour
1 s = 1/3600 hour
5.70 km/s = 5700 meters / 1/3600 hour
=20520000 meters/hour
Thus, the speed of 5.70 km/s converted into meters per hour would be 20520000 meters/hour.
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Which actions would the nurse implement when a client develops an anaphylactic reaction? select all that apply. one, some, or all responses may be correct.
The nurse would want to call a rapid response, place the patient on oxygen, and prepare for the administration of Epinephrine. This drug is the first-line treatment for anaphylactic shock, and It will increase blood pressure, decrease swelling, and dilate the airway.
“Nursing is not an easy job. It takes physical and mental stamina to survive a 14-hour shift.” If you believe, you may find yourself thriving. in the midst of activity.
There is much to learn. The exams are difficult, the schedules are complex, and the challenges pile up. All these factors can make life as a student difficult. Nursing is a highly competitive field from the moment you start the application process until you graduate.
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What is the approximate power per area emitted by the inside wall of an oven when baking a cake in w/m2?
The approximate power per area emitted by the inside wall of an oven when baking a cake in w/m2 is 6 x 3^4.
What is power per area?Comparing the surface power density of various industrial energy sources is crucial. Geographer Vaclav Smil popularised the idea. In the pertinent literature, the phrase is sometimes abbreviated to "power density," which may cause confusion with similar or homonymous concepts.
The power obtained per square metre of Earth's surface area utilised by a particular energy system, including all supporting infrastructure, manufacturing, fuel mining (if relevant), and decommissioning, is expressed in W/m2. Due to the high power density of fossil fuels and nuclear energy, substantial amounts of electricity may be produced in very small spaces at power plants.
6 x 3^4 (for reference Humans are about 300 K)
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To make a water-insoluble substance water-soluble, a chemist could add groups with bonds between.
To make a water insoluble substance water soluble, a chemist can add groups with bonds between atoms with different attraction for electrons.
A water soluble drug or substance is easier to be taken up in your digestive system.
Positive and negative are attracted which makes a cohesive structure. When polar compounds or ions gets added to the water, these compounds breaks down or degrades into smaller components. They also might dissolve to become the part of the solution.
The partial charges of water attracts the various parts of a compound. When attraction occurs, it gets more soluble in the water.
Thus, by adding groups with bonds between atoms with different attraction for electrons, substance can become water soluble.
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A 10 mg mosquito-sized insect needs a mere millimeter of total foot edge to be supported by surface tension. how about a 60 kg man?
A 60 kg man would need a 8000 meters of total foot edge to be supported by surface tension.
Many insects can walk on the water, because of the surface tension at the water surface.
Surface water molecules attract more strongly to the water molecules around them and create a high surface tension with smaller surface area of a water.
The water molecules at the surface do not have other water molecules to form hydrogen bonds, only below and to either sides, like other water molecules that hydrogen bond with other water molecules on all sides.
The surface tension at the water surface is not strong enough to support man on the water.
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an electrical conductor is in a strong magnetic field. how is the conductor affected if it is connected to a battery so that current flows through the conductor?
When placed in a magnetic field, a current-carrying conductor experiences a mechanical force that can cause the conductor to move.
How does the magnetic field impact current?
Current and magnetic force are directly inversely connected in a homogeneous magnetic field for a straight current-carrying wire. As a result, the force is inversely related to the size of the current. This translates to: If the current is doubled, the force on the conductor will also double.
How do the fields of electricity and magnetism interact?Electric fields are created by differential voltages; the stronger the voltage, the stronger the resulting field. Magnetic fields are produced by electric current, and the stronger the current, the stronger the magnetic field. There will always be an electric field present even when there is no current flowing.
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Which observation most likely indicates that only a chemical change has taken place?(1 point)The change cannot be reversed.
The shape changes
States of matter changes.
A reaction occurs.
Answer:
Correct answer is “a reaction occurs” because in the readings it says specifically chemical changes can be reversed but it’s not easy.
Explanation:
Is it the power of material evidence that wins, not the authority of experts that
proves an answer in Science.
Yes, it is the power of material evidence that wins.
Evidence used to support or refute a scientific theory or hypothesis is known as material evidence.Evidence is also used by scientists in various contexts, such as when they apply ideas to real-world issues.Whether a person accepts the data as proof depends on their presumptions or views regarding how observations relate to a theory.A creative hypothesis is developed by a scientist and may be refuted by testing it against evidence or established truths.Evidence can refute a hypothesis by demonstrating facts that are at odds with it. In contrast, the presence of evidence does not preclude the possibility of future, undiscovered evidence supporting the idea.Therefore, it is the power of material evidence that wins, not the authority of experts that
proves an answer in Science.
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The most common ions for silver, zinc, and scandium are ag , zn2 , and sc3 . which of these ions have the same number of electrons as a noble-gas element?
Sc3+ ion has the same number of electrons as a noble-gas element.
For example, scandium (Sc) is an element with atomic number 21.
Electron configuration of scandium atom: ₂₁Sc 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹.
Electron configuration of scandium ion 3+: 1s² 2s² 2p⁶ 3s² 3p⁶
Scandium ion Sc³⁺ has the same number of electrons as noble gas argon (Ar).
Silver (Ag) is an element with atomic number 47.
Electron configuration of silver metal: [Kr] 4d¹⁰ 5s¹
Electron configuration of silver ion 1+: [Kr] 4d¹⁰
It does not have same configuration as noble gas.
Zinc a chemical element (the group 12 of the periodic table) with symbol Zn and atomic number 30, which means it has 30 protons and 30 electrons, because atom has neutral charge.
Electronic configuration of zinc atom: ₃₀Zn 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s².
Electronic configuration of zinc ion Zn²⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰
It does not have same configuration as noble gas.
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Calculate the number of atoms per cubic meter in aluminum. the density of al is 2.71 g/cm3, while its atomic weight is 26.98 g/mol.
The number of atoms per cubic meter in aluminum is 6.04 x 10²².
What is density?"Density is the mass per unit volume. Density is a scalar quantity. It is denoted by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume."
The density of Al is 2.71 g/cm3
The atomic weight of Aluminum is 26.98 g/mol.
The Avogadro's number is 6.023 x 10²³
To find the number of atoms per cubic meter
N = ρNa / A
N = 2.71 x 6.023 x 10²³ / 26.98 = 6.04 x 10²²
Thus, the number of atoms per cubic meter in aluminum is 6.04 x 10²².
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Solid sodium is reacted with 45.0 mL of a 2.00 mol/L H2SO4(aq) and aqueous solutions of hydrochloric acid and sodium sulfate are formed. How many moles of sodium sulfate are produced?
Number of moles of sodium sulfate is 0.633 mol.
The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per litre of a solution is known as molarity.A count of a very large number of particles is called the number of moles. The Avogadro number is equal to one mole of any material.Given,
volume of solution= 45mL
molarity of soultion = 2.00 mol/L
we have to find number of moles of sodium sulfate.
Molar mass of sodium sulfate = 142
Number of moles of Na2SO4 = (Molarity of Na2SO4 × volume of the solution) / molecular mass of Na2SO4.
No. of moles of H2SO4 = (2 × 45) / 142 = 0.633 mol
Therefore, number of moles of sodium sulfate in solution is 0.633
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What is the atomic number of Gold
When a liquid changes to a solid
what happens to it's density?
Answer:
When a liquid is remained a liquid the the particles are loose but as the liquid turns into solid the particle get more compact and closer together. So in that case the liquid will have lower density.
Note: I hope you have a Fantastic day!
. Describe how liquid changes to gas using the following terms at least once.
Word Bank: particle speed, thermal energy, particle spacing, liquid, gas, evaporation!
(please give an answer quickly!)
When water is added to a compound in a chemical equation, a new compound can be formed via?
When water is added to a compound in a chemical equation, a new compound can be formed via hydrolysis.
What is hydrolysis?It refers to any chemical process when a water molecule breaks one or more chemical bonds. When water is the nucleophile, the phrase is used generically to refer to substitution, elimination, and solvation processes.
The cleavage of biomolecules known as biological hydrolysis occurs when a water molecule is consumed in order to cause the division of a bigger molecule into its component parts. Scarification is the process of hydrolyzing a carbohydrate into its individual sugar molecules, as occurs when sucrose is broken down into glucose and fructose.
A condensation reaction, in which two molecules combine to form a bigger one and expel a water molecule, can be reversed by a hydrolysis reaction. Thus, condensation builds up by removing water, but hydrolysis breaks down by adding water.
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Which atoms in the amino acids become the h2o molecule produced by their action in model?
Atoms in the amino acids become the h₂O molecule produced by their action in the model and come off from the central carbon and nitrogen but not from the carboxyl, R side chain, or amine.
An amino acid is a group of organic molecules that consist of a basic acidic carboxyl group (―COOH), amino group (―NH2), and an organic R group (or side chain) that is different from each amino acid. Amino acid, the term is a short form of α-amino [alpha-amino] carboxylic acid.
Whereas, the peptide bond is the chemical bond which is a chemical bond formed between two molecules when the carboxyl group of a particular molecule reacts with the amino group of the other molecule, leading to releasing a molecule of water (H2O).
Each molecule consists of a central carbon atom referred to as the α-carbon, to which both a carboxyl group and amino are attached. The remaining two bonds of the α-carbon atom are generally occupied by the R group and a hydrogen (H) atom .
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true or false: sn2 mechanism for nucleophilic substitution reactions involves one step and occurs with inversion of configuration.
Sn2 mechanism for nucleophilic substitution reactions involves one step and occurs with inversion of configuration is true.
Sn2 is a single-step mechanism in which the bond is broken by the attacking nucleophile from the back of the carbon atom. Two reactants are involved in this reaction.
In this mechanism, The nucleophile approaches the substrate at 180° to the carbon leaving group. The carbon-nucleophile bond is formed and the carbon leaving group breaks.
The nucleophile can attack at the same side where the leaving group is present or the nucleophile can attack from the opposite side of the carbon atom. Since complete inversion of configuration is required, so it is compulsory for the nucleophile to attach from the opposite side.
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How many ions of Na+ and C1- will be present in 30g of NaCl?
Ans fast plis
3.08*10^23 ions of Na+ and Cl- will be present in 30g of NaCl.
Weight of NaCl is equal to sum of weight of one mole of sodium and one mole of chloride.
Mathematically, it can be represented as -
1 mol (Na) + 1 mol (Cl)
= 23.0+ 35.5
= 58.5 g/mol
In 58.5 gram of NaCl, there is one mole of Na or 6.02*10^23 ions
In one gram of NaCl, there will be
=6.02*10^23/58.5 sodium ions
In 30 grams of NaCl, the number of sodium ions will be -
(6.02*10^23*30)/ 58.5
=3.08*10^23 ions
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Which element forms easily into thin sheets?
O carbon
O helium
O gold
O bromine
What concentration gradients are established and maintained by the sodium-potassium exchange pump?.
Answer:
High sodium concentration in the extracellular fluid and high potassium concentration in the cytoplasm
Explanation:
PLEASE HELP ASAP ILL RATE U 5 STARS AND BRAINLEY
Using the periodic table, draw Bohr-Rutherford Diagrams of each of the elements (one
atom) before bonding. Then draw the NH3 molecule indicating all the shared electrons as either dots or crosses (as Xs), paying close attention to the valence electrons. Indicate whether the formation of ammonia is an ionic or a covalent bond and explain your reasoning.
In the formation of ammonia, nitrogen shares three electrons in a covalent bond with three hydrogen atoms
What is the bonding in [tex]NH_{3}[/tex]?We can see that nitrogen has five electrons on its outermost shell. It is able to accept three electrons and share them with another atom in order to form a covalent bond.
In the formation of ammonia, nitrogen shares three electrons in a covalent bond with three hydrogen atoms to give the compound [tex]NH_{3}[/tex]. This explains why the bond that exists in the ammonia molecule is a covalent bond.
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A 2.760 g sample of carbon was burned, yielding 10.120 g of carbon dioxide. how many grams of oxygen was taken up by the reaction? 10.73 g 4.258 g 8.80 g 7.360 g 6.257 g
If a 2.760 g sample of carbon was burned, yielding 10.120 g of carbon dioxide, the grams of oxygen taken up by the reaction was 7.360 g
The balanced equation of chemical reaction is :
C + O₂ → CO₂
Given data is-
Given mass of Carbon- 2.760 g
Amount of carbon dioxide produced- 10.120 g
The molecular mass of carbon dioxide = 44.0 g/mole
To calculate number of moles, equation used is,
Number of moles (n) = Given mass
Molar mass
n = 10.120 g
44.0 g/mole
= 0.23 moles
So, The number of moles of oxygen produced is,
number of moles of O₂ = number of moles of CO₂
n = 0.23 moles.
Now, the molecular mass of oxygen is,
M = (2 × 16.0)g/mole = 32.0 g/mole
Mass of product = number of moles × molecular mass
m = (0.23 × 32.0) g
m = 7.360 g
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