If the volume and mass measurements on a sample of copper are 32.465 g and 3.62 mL, the values for the density should have how many significant digits
Answers
Density = Mass / Volume = 32.465/ 3.62 = 8.96 m3.
Thus, Each element and compound has a distinct density, Density is a physical attribute of matter. In a qualitative sense, density is the quantification of the relative "heaviness" of things with a constant volume.
A crumpled piece of paper of the same size is visibly less dense than a rock. A ceramic cup is more dense than a styrofoam cup.
The relationship between mass and volume is expressed by the physical attribute of matter known as density. An object is said to be more dense if it contains more mass in a given volume. It is crucial to keep in mind, however, that this relationship involves more than just how tightly packed together an element's or a compound's molecules are.
Thus, Density = Mass / Volume = 32.465/ 3.62 = 8.96 m3.
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Related Questions
Which of the following groups of chemical elements would you expect to
be most alike in their physical and chemical properties?
A. Chromium, rhodium, zinc, silicon
B. Magnesium, strontium, radium, barium
C. Lithium, beryllium, boron, oxygen
D. Sulfur, selenium, chlorine, krypton
Answers
Answer: B. Magnesium, strontium, radium, barium
Explanation:
Elements are distributed in groups and periods in a periodic table.
Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.
Magnesium (Mg) , Strontium (Sr) , Radium (Ra) and Barium (Ba) are elements which belong to Group 2. They have 12, 38, 88 and 56 electrons respectively and contain 2 valence electrons each and need one electron to complete their octet.
The chemical reactivity of elements is governed by the valence electrons present in the element and thus they are alike in physical and chemical properties.
What element has the highest electrical conductivity?
Mg
H
He
CI
Answers
Helium(He) will have the highest electrical conductivity.
Magnesium (Mg) is a metal, so it is electrically conductive in nature, though not as much as hydrogen and helium.
Above certain temperatures, hydrogen(H) is also electrically conductive.
Helium(He) The ease with which an electric charge or heat can pass through a material is measured as conductivity. A conductor is a material that resists the flow of an electric current or thermal energy very little. Metals are generally good conductors of electricity.
Because chlorine(Cl) is a nonmetal, it has the lowest electrical conductivity.
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In an atom, the number of protons equals the number of
A.nuclei.
b. electrons.
neutrons.
d. isotopes.
c.
Answers
The number of protons is equal to the number of electrons.
Using given data, calculate the change in Gibbs free energy for each of the following reactions.You may want to reference (Pages 831 - 832) Section 19.6 while completing this problem.Part A:2Ag(s)+Cl2(g)→2AgCl(s)Gibbs free energy for AgCl(s) is −109.70 kJ/molExpress your answer without scientific notation and using one decimal place.(units kJ)
Answers
The change in Gibbs free energy is -219.4 kJ/mol that can be calculated by using the given entites.
The preferred Gibbs free energy of formation (Gf°) of a compound is the extrade of Gibbs free energy that accompanies the formation of one mole of a substance in its preferred country from its constituent factors of their preferred states (the maximum solid shape of the detail at 1 bar of strain and the required temperature. The preferred loose electricity of formation of a substance is described because the loose-electricity extrade which ends whilst 1 mol of substance is ready from its factors at the usual strain of one atm and a given temperature, commonly 298 K. It is given the symbol ΔGf°.
Delta G= delta G products - delta G reactants
=[2 mol * delta G_f, AgCl(s)]-[(2 mol* delta G_f, Ag(s))+(1 mol *delta G_f, Cl2(g))]
=2 mol* -109.70 kJ/mol - [2 mol * 0 kJ/mol + 1 mol * 0 kJ/mol]
=-219.4 kJ
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CCC Energy and Matter Recall that force = mass x acceleration. Explain why the
acceleration of a model rocket increases over time, even if the force from the
burning of the rocket fuel remains constant.
Answers
Answer:
The mechanical device inside just gets the energy of the fuel and not the actual liquid.
Explanation:
The acceleration increases since the mechanical device is getting the energy of the fuel and not the fluid.
Just an idea
The information regarding the acceleration of a model rocket should be explained below;
The following information should be considered:
The mechanical device i.e. inside just gets the energy of the fuel but not the actual liquid.The acceleration increases because the mechanical device is getting the energy of the fuel however not the fluid.Learn more: https://brainly.com/question/1979431?referrer=searchResults
alexander fleming discovered the antimicrobial properties of penicillium notatum.
Answers
The statement "Alexander Fleming discovered the antimicrobial properties of penicillium notatum" is true.
Alexander Fleming, a Scottish bacteriologist, is credited with the discovery of the antimicrobial properties of Penicillium notatum, a type of mold. In 1928, while working at St. Mary's Hospital in London, Fleming observed that a mold contaminant had inhibited the growth of bacteria in a petri dish.
He identified the mold as Penicillium notatum and named the substance it produced as penicillin. Fleming's discovery of penicillin marked a significant milestone in the field of medicine, as it paved the way for the development of antibiotics.
Penicillin revolutionized the treatment of bacterial infections and saved countless lives. Fleming's work earned him the Nobel Prize in Physiology or Medicine in 1945.
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Complete question :
Alexander Fleming discovered the antimicrobial properties of penicillium notatum. T/F
which of the following will react with a solution of zinc sulphate fastest ?
A. Potassium
B. Aluminum
C. Magnesium
D. Copper
Answers
Answer:
C. Magnesium
Explanation:
Zinc sulphate (ZnSO4) will react fastest with Magnesium (Mg) because magnesium is more reactive than Zinc and other given elements.
Zinc sulphate (ZnSO4) reacts with Magnesium (Mg) and undergo displacement reaction. Zinc is displaced by magnesium and form Magnesium Suphate (ZnSO4).
ZnSO4 + Mg => MgSO4 + Zn
How many moles are in 20 grams of O₂ gas?
Answers
To which of the three main chemical classes does Mercury (Hg) belong?
a) It's not an element in the periodic table
b) Metalloids
c) Non-metals
d) Metals
Answers
Answer:
Metals
Explanation:
It is a transition metal
The periodic table has a lot of different properties in how it is presented, one of these, is that the elements are separated in blocks by their properties.
From its position in the table, we can see that the correct option is d) metals.
The general way of knowing if an element is a metal or not, is to look if it is the D block in the periodic table.
This block contains all the transition metals (not all the metals) but every element in it is a metal. If we look for the mercury, we can see that it is in block D, just next to gold (Au).
Just from this, we can conclude that mercury is a metal, so the correct option is d.
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Determine the carburizing time necessary to achieve a carbon concentration of 0. 30 wt% at a position 4 mm into an iron–carbon alloy that initially contains 0. 10 wt% C. The surface concentration is to be maintained at 0. 90 wt% C, and the treatment is to be conducted at 1100°C. Use the diffusion data for γ-Fe in Table 5. 2. ( Callister, Materials Science and Engineering, 9th ed. , John Wiley & Sons, Inc. , 2014) Express your answer in hours to three significant figures
Answers
The carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy is 63.4 hours.
To determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy, we can use Fick's second law of diffusion:
\(DC_{surface} / 2 = (C_{surface} - C_{4mm}) / erf(x / (2 * \sqrt{Dt} ))\\\)
where D is the diffusion coefficient, \(C{surface}\\\) is the surface carbon concentration (0.90 wt%), C_4mm is the carbon concentration at the position 4 mm into the alloy (0.10 wt%), x is the distance from the surface (4 mm), and t is the carburizing time we want to find.
We can use the diffusion coefficient for γ-Fe at 1100°C from Table 5.2, which is D = \(6.0 * 10^{-12} m^2/s.\)
Substituting the given values, we get:
\((6.0 * 10^{-12} m^2/s) * (0.90 - 0.30) / 2 = (0.90 - 0.10) / erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s} ))\)
Simplifying the left-hand side, we get:
\(1.8 * 10^{-12} m^2/s = (0.80) / erf(4 mm / (2 * \sqrt{(6.0 * 10^{-12} m^2/s) * t)})))\)
Taking the inverse error function of both sides, we get:
\(erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s) * t)} ) = 0.000346\)
Substituting this back into the previous equation, we get:
\(1.8 * 10^{-12} m^2/s = (0.80) / 0.000346\)
Solving for t, we get:
t = 63.4 hours
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C. We should only carry out terrace ......... on the sloppy land.
Answers
We should only carry out terrace farming on the sloppy land. This is the type of farming done on slope land
What is terrace farming?Terrace farming is a method of farming where steps (terraces) are built into the slopes of a hill or mountain to create flat surfaces for cultivation. This technique is commonly used in areas with steep slopes or hills where traditional flat farming is not feasible.
The terraces help to prevent soil erosion, improve water retention, and make it easier to cultivate crops. Terrace farming has been used for centuries by various civilizations around the world, including the Incas in South America and the rice farmers of Southeast Asia.
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Which of the following are needed for an electrical circuit? Choose all that apply
A.A mental conductor for electrons to pass through
B.light bulb
C.two negative ends to a battery
D.closed loop
E.charged battery to provide an electrical difference
Answers
Answer:
E\charged battery to provide electronic difference
The rate constant for the hydrolysis of sucrose, a first order reaction, is 0.21 hr-1. a) What is the half-life of the reaction? b) How long will it take for a 2.5M solution to hydrolyze until 0.10M solution of sucrose remains?
Answers
Answer:
a) The half-life of the reaction is approximately 3.3 hours.
b) It will take approximately 10.8 hours for a 2.5 M solution of sucrose to hydrolyze until a 0.10 M solution remains.
The hydrolysis of sucrose is a first-order reaction, which means that its rate depends on the concentration of the sucrose itself. The rate constant, denoted by k, is a proportionality constant that links the rate of the reaction to the concentration of the reactant.
a) To determine the half-life of the reaction, we use the formula t1/2 = (0.693/k), where t1/2 is the half-life and k is the rate constant. Substituting the given value of k, we get:
t1/2 = (0.693/0.21) hr ≈ 3.3 hr
Therefore, the half-life of the reaction is approximately 3.3 hours.
b) To determine how long it will take for a 2.5 M solution of sucrose to hydrolyze until a 0.10 M solution remains, we use the first-order integrated rate law, which relates the concentration of the reactant to the elapsed time of the reaction. The integrated rate law for a first-order reaction is given by:
ln([A]t/[A]0) = -kt
where [A]t is the concentration of the reactant at time t, [A]0 is the initial concentration of the reactant, k is the rate constant, and ln is the natural logarithm.
Rearranging the above equation, we get:
t = (ln[A]0 - ln[A]t) / k
Substituting the given values, we get:
t = (ln(2.5) - ln(0.10)) / 0.21 ≈ 10.8 hours
Therefore, it will take approximately 10.8 hours for a 2.5 M solution of sucrose to hydrolyze until a 0.10 M solution remains.
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which cells carry nutrients from food to the rest of the cells in the body?
Answers
Answer: The circulatory system.
Explanation: The circulatory system, which is part of the "cardiovascular" system, is one of the eleven organ systems of the human body. Its main function is to transport nutrients to cells and wastes from cells (Figure 3.4. 1). This system consists of the heart, blood, and blood vessels.
The blood cells carry nutrients from food to the rest of the cells in the body.
What is the circulatory system?The human circulatory system moves important nutrients and minerals throughout the body and metabolic waste products out from the body. The human circulatory system contains blood, blood vessels, heart, and lymph.
The human circulatory system provides essential nutrients, minerals, oxygen, and hormones to different parts of the body and is responsible for collecting toxins from the cells and tissues to be purified or eliminated from the body.
The human circulatory system contains a wide network of blood vessels. These constitute arteries, veins, and capillaries. The primary function of blood vessels is to transport nutrients and oxygenated blood to all parts of the body.
The Circulatory system helps in sustaining all the organ systems and transports blood, nutrients, oxygen, and hormones throughout the body. It secures cells from pathogens and acts as an interface for cell to cell interaction.
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Explain each of these impacts and suggest a solution that would reduce the losses caused by bycatch.
Answers
Answer:
Bycatch can negatively affect species such as dolphins, sea turtles, protected fish, and whales by harming animals, contributing to population declines, and impeding population recovery. Other impacts of fisheries on marine mammals may include removal of their preferred prey and sometimes habitat damage.
Explanation: hey could i get to kno u or sum
amines are multiple choice organic bases that react with water to produce ammonia. organic acids that react with water to produce ammonia. organic bases that react with acids to form ammonium salts. organic acids that react with bases to form ammonium salts.
Answers
Amines are the organic bases that react with acids and form ammonium salts.
Amines are Lewis bases. according to Lewis acid are the electron pair acceptor and bases are the electron pair donor. Amines are that contains a nitrogen atom connected to other groups with the single bond. Amine group has as lone pair of electrons. so. amines can donate the lone pair of electrons to the other molecules. so. amines are the bases or the Lewis bases. Amines are the weak bases. Amines are the derivative of ammonia.
Thus, Amines are the organic bases that react with acids and form ammonium salts.
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Which pair of properties describes the elements in group 18
Help
Answers
The question is incomplete; the complete question is;
Which pair of properties describes the elements in Group 18?
They are chemically stable and liquid at room temperature.
They have eight valence electrons and are flammable.
They are magnetic and boil at low temperatures.
They are gaseous at room temperature and chemically stable.
Answer:
They are gaseous at room temperature and chemically stable.
Explanation:
The group 18 elements are generally called the noble gases or the inert gases. This is because they are mostly monoatomic gases with a high degree of chemical stability.
Recall that group 18 elements already have eight electrons in their outermost shell so they are very stable as a result of a complete octet. They do not easily participate in chemical reactions because of their chemical inertness.
Which of the following statements can be used to prove that carbon is tetrahedral?
a.) CH3Br does not have constitutional isomers
b.) CBr4 does not have a dipole moment
c.) CH2Br2 does not have constitutional isomers.
Answers
The statement that can be used to prove that carbon is tetrahedral is:
b.) CBr4 does not have a dipole moment.
In a tetrahedral geometry, the four bonded atoms or groups are arranged symmetrically around the central carbon atom, resulting in a net dipole moment of zero. This is because the individual dipole moments of the carbon-bromine bonds cancel out each other due to their symmetric arrangement. If the carbon atom were not tetrahedral, there would be an uneven distribution of charge leading to a non-zero dipole moment.
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Which of the following reactions would have a decrease in entropy?
A. 2H20(g) → 2H2(g) + O2(9)
B. 2503(9) ► 2502(g) + O2(g)
C. 2NH3(9) ► N2(g) + 3H2(9)
D. 2NO2(g) → N204(9)
Answers
Answer:
D. 2NO2(g) → N204(9)
Explanation:
A p e x
2NO\(_2\)(g) → N\(_2\)O\(_4\)(g) reactions would have a decrease in entropy. Therefore, the correct option is option D.
What is entropy?Entropy is a measureable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty. From classical thermodynamic, where it was originally recognized, towards the microscopic explanation of nature within statistical physics, the name and concept are employed in a variety of disciplines.
It has numerous applications in physics and chemistry, biological systems and how they relate to life, cosmology, economics, society, weather science, and information systems, especially the exchange of information. 2NO\(_2\)(g) → N\(_2\)O\(_4\)(g) reactions would have a decrease in entropy.
Therefore, the correct option is option D.
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if an EXOTHERMIC reaction takes place in a container, the container will feel
a. hotter
b.colder
c. neither hotter nor colder
Answers
What is the approximate concentration of reaction product in a solution that has an absorbance of 0.7 at ph 6.0?
Answers
The approximate concentration of reaction product in a solution that has an absorbance of 0.7 at ph 6.0 is based on the equation A = εbc given in the passage, the concentration c is the absorbance A divided by the absorptivity ε in a 1 cm path length cell. 0.7 divided by approximately 1400 gives 500 μM.
A = εbc
0.7 = 1400 x c
7/14000 = 1/2000 = 0.0005 = 5x10^-4 = 500 μM
1 μM = 1 x10 ^-6
The concentration of a substance is the amount of solute present in a given volume of solution. Concentration is usually expressed in molarity, defined as the number of solutes in 1 L of solution. Solution concentration is a measure of the amount of solute dissolved in a given amount of solvent or solution.
Concentrated solutions are solutions that contain relatively large amounts of solutes. Dilute solutions are solutions that contain relatively small amounts of solutes. The definition of concentration means the amount of an ingredient or part relative to other ingredients or parts. An example of concentration is the amount of salt to water in a brine solution.
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need help i will give you thanks:)
Answers
Answer:
Precipitation
Explanation:
Precipitation is when water falls from the clouds back to earth as rain, snow, or hail. The water returns to the rivers to continue the water cycle. So, the answer is D, precipitation.
I hope this helps :)
Answer:
Vapor Information
Explanation:
Atmospheric rivers are relatively long, narrow regions in the atmosphere like rivers in the sky that transport most of the water vapor outside of the tropics. Not all atmospheric rivers cause damage, and most are weak systems that often provide beneficial rain or snow that is crucial to the water supply.
(You're welcome and have a nice day/night Ma'am/Sir.)
Visible light is a part of what spectrum
Answers
Answer:
Visible Spectrum/Electromagnetic spectrum
Explanation:
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
Lithium is the least dense metal know with a density of 0.53 g/cm³. What is the volume occupied by 1.20x10³ grams of lithium
Answers
Answer:
2264.15 cm³Explanation:
The formula for finding the volume of an object given it's mass and density is given by
\(volume = \frac{mass}{density} \\ \)
From the question
mass = 1.2 × 10³ grams
density = 0.53 g/cm³
We have
\(volume = \frac{1.2 \times {10}^{3} }{0.53} = 2264.1509\\ \)
We have the final answer as
2264.15 cm³
Hope this helps you
Explain in a three-paragraph essay the mechanics of how a battery works. How does the choice of metals used in a battery affect its performance? what specific metals work best?
Answers
A battery is a device that converts chemical energy into electrical energy through a process known as an electrochemical reaction.
How does a battery work ?When a battery is connected to a circuit, the electrochemical reaction causes a flow of electrons from the anode to the cathode, generating an electric current that can power a device.
The metal chosen for the anode must be capable of losing electrons easily, while the metal chosen for the cathode must be capable of accepting electrons. The choice of metals can also affect the voltage and capacity of the battery, as well as its overall efficiency.
In general, the metals used in a battery should have a large difference in their electronegativity values, which determines how easily an atom can attract electrons. Common metals used in batteries include zinc, lithium, nickel, and cadmium.
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7. Calculate the percent composition of ZnSO4.
Answers
% composition = Ar/Mr x 100%
MM (molar mass) ZnSO₄ = 161 g/mol
AM (atomic mass) Zn = 65.38 g/mol
% Zn = 65.38/161 x 100% = 40.6%
AM (atomic mass) S = 32 g/mol
% Zn = 32/161 x 100% = 19.9%
AM (atomic mass) O = 16 g/mol
% Zn = 4.16/161 x 100% = 39.6%
How many grams of water can be vaporized with 6500 J of energy? The heat of
vaporization for water is 2330 J/g.
Answers
Given :
The heat of vaporization for water is 2330 J/g.
To Find :
How many grams of water can be vaporized with 6500 J of energy.
Solution :
It is given that heat of vaporization for water is 2330 J/g.
Means 2300 J of heat is required to vaporize 1 g of water .
Let , n grams of water is produced by 6500 J of energy .
\(n=\dfrac{6500\ J}{2330\ J/g}\\\\n=2.79\ g\)
Therefore, 2.79 g of water will vaporize by 6500 J of energy .
Hence, this is the required solution .
All covalent compounds donot exist as giant aggregates. Why?
Answers
The volume of container 2 i 27. 32 L. How many mole of the ga are in container 2?
Answers
The number of moles in container 2 is 33.3moles when the container has 27.32L of gas inside it
The number of moles of gas in container 2 can be calculated using the Ideal Gas Law:
n = PV/RT
where n is the number of moles of the gas with known volume,
P is the pressure (assumed to be 1 atm for ideal gases),
V is the volume (27.32 liters),
R is the ideal gas constant (0.0821 L·atm/mol·K) and
T is the temperature (assumed to be 273.15 K).
Plugging in the values, we get:
n = (1 atm)(27.32 L)/(0.0821 L·atm/mol·K)(273.15 K)
n = 33.3 mol
Therefore, there are 33.3 moles of gas in container 2.
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Write a balanced reaction for which the following rate relationships are true.
Rate = -1/2 delta[N2O5]/ delta t = 1/4 delta[NO2] = delta[O2]/ delta t
A) 2 NO2O5 ---> 4 NO2 + O2
B) 4 NO2 + O2 ----> 2 N2O5
C) 2 N2O5 ---> NO2 + 4 O2
D) 1/4 NO2 + O2 -----> 1/2 N2O5
E) 1/2 N2O5 ---> 1/4 NO2 + O2
Answers
The balanced chemical equation for the given rate law is 4 NO2 + O2 -> 2 N2O5. This is because the rate law can be written as rate = -1/2 delta[N2O5]/ delta t = 1/4 delta[NO2] = delta[O2]/ delta t. The stoichiometry of the balanced equation shows that 4 moles of NO2 react with 1 mole of O2 to produce 2 moles of N2O5. The exponents in the rate law are determined experimentally through the method of initial rates.
The balanced reaction that satisfies the given rate relationships is; 4 NO₂ + O₂ → 2 N₂O₅. Option B is correct.
To determine the balanced reaction, we need to consider the stoichiometric coefficients that allow us to relate the changes in concentrations to the reaction rate.
According to the given rate relationships:
Rate = -1/2 Δ[N₂O₅]/Δt
Rate = 1/4 Δ[NO₂]
Rate = Δ[O₂]/Δt
From these relationships, we can see that the rate of the reaction is directly proportional to the changes in the concentrations of N₂O₅, NO₂, and O₂.
The balanced reaction 4 NO₂ + O₂ → 2 N₂O₅ satisfies these rate relationships. For every 4 moles of NO₂ and 1 mole of O₂ consumed, 2 moles of N₂O₅ are produced. This reaction allows for the rate of change in the concentrations of N₂O₅, NO₂, and O₂ to be consistent with the given rate relationships.
Therefore, the balanced reaction that matches the given rate relationships is 4 NO₂ + O₂ → 2 N₂O₅.
Hence, B. is the correct option.
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