How will this investigation explain joe's 2kg barbell that was left under the sun for about 30 minutes was so much hotter than his 10 kg barbell that was left in the sun for the same amount of time?
Answers
This investigation will explain why Joe's 2kg barbell was much hotter than his 10kg barbell after being left in the sun for the same amount of time. Heat is transferred through a process called conduction, which is the direct transfer of thermal energy between two objects in contact. This process is directly proportional to the thermal conductivity of the material and the surface area between the two objects.
Since Joe's 2kg barbell has a smaller surface area than his 10kg barbell, it will experience more heat transfer in a given time period, making it hotter than the 10kg barbell.
Additionally, certain materials have higher thermal conductivities than others, meaning they can transfer heat more quickly. Thus, the material of both barbells could also have a significant effect on the amount of heat transferred to each.
Ultimately, this investigation will explain why Joe's 2kg barbell became hotter than his 10kg barbell in a similar time period, based on their respective surface areas and the materials of which they are made.
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Related Questions
the oxidant in this reaction is nitric acid, however we use other reagents (bismuth nitrate, copper acetate, acetic acid) to form it in small quantities (aka in situ). nitric acid, however, is an extremely hazardous material. what safety hazards does nitric acid pose? the oxidant in this reaction is nitric acid, however we use other reagents (bismuth nitrate, copper acetate, acetic acid) to form it in small quantities (aka in situ). nitric acid, however, is an extremely hazardous material. what safety hazards does nitric acid pose? contact with combustible/organic material may cause fire. causes severe burns. can release noxious gases upon thermal decomposition. forms potentially explosive mixtures when mixed with ethanol.
Answers
Nitric acid is a highly corrosive and toxic substance that poses several safety hazards. Some of the main safety hazards associated with nitric acid are Corrosive, Toxic, Fire hazard, Potentially explosive mixtures.
Nitric acid is highly corrosive and can cause severe burns upon contact with skin or eyes. It can also corrode metals, plastics, and other materials.
Nitric acid is a strong oxidizer that can react violently with other chemicals, including organic compounds, and can release toxic fumes when heated or exposed to other substances.
Nitric acid is a strong oxidizing agent and can react with combustible materials, such as paper, wood, and cloth, potentially causing fire or explosion.
Nitric acid can form potentially explosive mixtures when mixed with certain other chemicals, such as ethanol.
To minimize the risks associated with using nitric acid, it is important to handle it with care and wear appropriate personal protective equipment (PPE), such as gloves, goggles, and a lab coat. It is also important to store nitric acid in a well-ventilated area, away from heat sources and combustible materials. Additionally, when using nitric acid in situ, it is important to ensure that the reagents used to form it are handled and stored properly.
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C2H5OH(l)+3O2(g)→2CO2(g)+3H2O(g)
If 9.2g of C2H5OH(l) burns completely in the presence of excess O2(g) according to the equation, how many grams of CO2(g) are produced?
A:0.40g
B:8.8g
C:9.2g
D:18g
Answers
Answer:
D. 18g
Explanation:
To get the answer, we will use an equation to convert the grams of C2H5OH to moles of C2H5OH, then I will convert the moles of C2H5OH to moles of CO2, and then I will convert the moles of CO2 to grams of CO2.
9.2g C2H5OH / 46.07g C2H5OH = 0.199 mol C2H5OH
0.199 mol C2H5OH (2 mol CO2 / 1 mol C2H5OH) = 0.398 mol CO2
0.398 mol CO2 (44.01g CO2 / 1 mol CO2) = 17.515g CO2
The answer closest to our answer is answer choice D. 18g
Therefore, the answer is D
In normal temperatures, carbon dioxide is a colorless, non-flammable gas, its calculated value is "18 gram".
Carbon dioxide calculation:
Equation:
\(\to \bold{C_2H_5OH\ (l)+3O_2\ (g) \to 2CO_2\ (g)+3H_2O\ (g)}\)
In the above-given scenario, We'll utilize an equation that converts grams of ethanol to moles of ethanol, then converts moles of ethanol to moles of carbon dioxide, and finally, transforms the moles of carbon dioxide into grams of carbon dioxide to get the result.
Following are the calculation of the conversion of carbon dioxide:
\(\to \frac{9.2\ g\ C_2H_5OH }{46.07\ g\ C_2H_5OH} = 0.199\ mol C_2H_5OH\\\\\to 0.199\ mol\ C_2H_5OH \ (\frac{2\ mol\ CO_2}{ 1\ mol\ C_2H_5OH}) = 0.398\ mol\ CO_2\\\\\to 0.398\ mol \ CO_2 \ (\frac{44.01\ g\ CO_2}{1 \ mol\ CO_2}) = 17.515\ g\ CO_2 \approx 18\ g \ CO_2\\\\\)
Therefore, the answer is "Option D".
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Describe the changes to the coastline pictured above. Look particularly at North and South Monomy Island.
Answers
Where is the picture?
12. How do you measure the volume of an ir regular solid? (describe and give the name for
procedure)
Answers
Answer:Year after year, J.Gilbert’s has clinched the “Best Entrée” title at the lauded Taste of Worthington Festival. And we’re often called “Worthingon’s Best Kept Secret.” Some consider us the best steakhouse in Worthington. Others simply consider us the best restaurant in Worthington. Enjoy our Prime wood-fired steaks and seafood – inspired by Kansas City-steakhouse fare – in a luxe, yet warm atmosphere, all served with impeccable care.
Explanation:
Determine the number of moles of hydrogen atoms in each sample.
a. 0.0885 mol C4H10
b. 1.3 mol CH4
c. 2.4 mol C6H12
d. 1.87 mol C8H12
Answers
Answer: D
Explanation:
Determine the number of moles of hydrogen atoms in .0885 mol C4H10
Which of the following is true about a motor neuron?
a. It passes information to another motor neuron.
b. It passes information to another neuron.
c. It stimulates cells associated with muscles or glands.
d. It cannot generate an action potential.
Answers
c. It stimulates cells associated with muscles or glands.
A motor neuron is a type of neuron that carries information from the central nervous system to muscles or glands. It is responsible for transmitting signals that initiate muscle contraction or glandular secretions. Motor neurons are activated by electrical impulses, or action potentials, that travel along the axon of the neuron to the synapse.
At the synapse, the action potential triggers the release of neurotransmitters that bind to receptors on the muscle or gland cell, triggering muscle contraction or glandular secretion. The motor neuron does not pass information to another neuron, it directly stimulates cells associated with muscles or glands.
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what will be the result of the reaction
(CH3COO)2+redP +Cl2
Answers
Answer:
(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl
Explanation:
This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.
The cultures of prehistoric humans are known mostly through the excavation of stone tools and other relatively imperishable artifacts. The early tool making traditions are often referred to as being paleolithic (literally "Old Stone Age). The Oldowan and Acheulian tool traditions of the first humans were the simplest applied research basic research Scientihe thought O philosophies technologies
Answers
The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.
Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.
The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.
Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.
By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.
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If crystal growth does not start on its own after the solution in the flask returns to room temperature, identify the best ways to promote this process. Select one or more: Add a bit of solid as a seed crystal. Scratch the bottom of the flask gently with a stirring rod. Place the flask on a hot plate to evaporate some solvent. Add ice cubes to the solution.
Answers
Answer: The best way to promote the process are:
--> Add a bit of solid as a seed crystal.
--> Scratch the bottom of the flask gently with a stirring rod.
Explanation:
A crystal growth is seen is SUPERSATURATED solutions which contains more solute than it can normally dissolve at that given temperature. It is usually very UNSTABLE and capable of releasing the excess solute if disturbed, either by shaking or seeding with a tiny crystals.
Crystallization can be used for the separation of two salts with different solubilities as well as for purification of a soluble salt that contains insoluble solid impurities. Recrystallization improves the validity of the process. Crystallization can be initiated by:
--> Scratching the bottom of the flask gently with a stirring rod: scratching initiates crystallization by providing energy from the high-frequency vibrations.
--> Adding a bit of solid as a seed crystal: Seed crystals create a nucleation site where crystals can begin growth.
Why is the mole important? Group of answer choices It can be applied to any type of object: molecules, atoms, ions, etc. It gives us a convenient way to express large numbers. It is useful when converting between grams and atoms or molecules. All of the above.
Answers
Answer: the mole
Explanation:
The mole is the unit of amount in Chemistry.
It provides a bridge between the atom and the macroscopic amounts of material that we work with in the laboratory.
Non-ferrous metal is NOT hardenable by heat treatment; it must
gain strength through a process such as tempering. Is this
statement TRUE or FALSE?
Group of answer choices
True
False
Answers
The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.
Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.
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After Dalton's proposed atomic theory, several atomic models were developed. Which model was the first propose the existence of
small, dense nucleus?
Answers
Answer: Rutherford's model was the first propose of the existence of small, dense nucleus's.
Explanation: The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge. Electrons are particles with a negative charge. Electrons orbit the nucleus. The empty space between the nucleus and the electrons takes up most of the volume of the atom.
Answer: Here is the correct image of the first atomic model it's in the picture!
Explanation: I did it on USA Test Prep to see which one is right
If 1.2 g of ammonium bicarbonate is treated with .75 grams of sodium chloride, 63.0075 grams sodium bicarbonate will be produced. In this reaction NaCI is limiting reagent. True or false
Answers
Answer:
True
Explanation:
Limiting reagent is the reactant that determines the progress of the reaction. It determines how much of the product is formed.
The equation for this reaction is;
NaCl (aq) + NH4HCO3 (aq) → NaHCO3 (aq) + NH4Cl (aq)
From the reaction, 1 mol of NaCl reacts with 1 mol of NH4HCO3 to produce 1 mol of NaHCO3
Converting to masses using; Mass = Number of moles * Molar mass
58.44g of NaCl reacts with 79.056g of NH4HCO3
If we were to sue the whole 1.2 g of NH4HCO3 we would require xg of NaCl
58.44 = 79.056
x = 1.2
x = 0.887g
The fact that 1.2g of NH4HCO3 requires 0.887g of NaCl (which is less than the available 0.75g) means that NaCl is the limiting reagent.
How do we get energy from the food we eat?
A
The constantly moving molecules in food give us kinetic energy.
B
Breaking the molecular bonds in the food releases stored chemical energy.
C
Eating hot food transfers thermal energy to our bodies.
D
The chemical energy stored in the food is transferred to us as thermal energy.
Answers
Answer:
b. breaking the molecular bonds in the food
How many significant figures are in each underlined measurement?
Answers
Answer:
Give the number of significant figures in each measurement. By rule 1, all nonzero digits are significant, so this measurement has three significant figures.
Which of the following compounds will be most soluble in nonane (C₉H₂O)?
a. 1-pentanol
b. benzene
c. ethanol
d. ethyl methyl ketone
e. acetic acid
Answers
The solubility of a compound in a particular solvent depends on several factors, including the polarity of the solvent and the solute. Nonane is a nonpolar solvent, which means that it cannot dissolve polar compounds effectively. In general, compounds with nonpolar properties are more soluble in nonane compared to polar compounds.
1-pentanol, ethanol and acetic acid are polar compounds because they contain a hydroxyl group (-OH) or carbonyl group (C=O) that makes them more soluble in polar solvents such as water. Benzene and ethyl methyl ketone are nonpolar compounds because they lack any polar functional groups and contain only carbon and hydrogen atoms.
Based on their polarities, we can predict that benzene and ethyl methyl ketone will be the most soluble in nonane because nonane is a nonpolar solvent. The polar compounds (1-pentanol, ethanol, and acetic acid) will not dissolve well in nonane due to their polarity. Acetic acid may have some solubility in nonane because it has a relatively small polar functional group and a large nonpolar hydrocarbon chain. In conclusion, the most soluble compound in nonane is likely to be benzene or ethyl methyl ketone, both of which are nonpolar. The polar compounds are not expected to be very soluble in nonane due to the nonpolar nature of the solvent.
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The rate of decomposition of aldehyde (CH3 CHO) into CH4 and CO in presence of I2 at 800 K follows the rate law: r=K[CH3CHO[I2]. The decomposition is believed to go to the two step mechanism:
CH3CHO+I2 → CH3I+HI+CO
CH3I+HI → CH4 + I2
What is the catalyst for the reaction? Which of the two steps is the slower one?
a. H1, Ist step
b. I2, Ist step
c. HI, IIst step
d. I2, IIst step
Answers
The catalyst for the decomposition of aldehyde (CH3CHO) into CH4 and CO in the presence of I2 at 800 K is I2. The slower step in the two-step mechanism is the first step. So, the correct option is (b) I2, Ist step.
The catalyst for the reaction is I2, as it is present in the rate law and is not consumed in the reaction. The slower step in the two-step mechanism is typically the rate-determining step, so we can examine the rate law for clues. The rate law contains both CH3CHO and I2, which are involved in the first step, but only CH3I and HI are involved in the second step. Therefore, the slower step must be the first one, and the answer is b. I2 is the catalyst for the reaction and the slower step is the first one, CH3CHO+I2 → CH3I+HI+CO.
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9. CONCENTRATION OF DRUG: A drug is injected into a patient's bloodstream and t seconds later, the concentration of the drug is C grams per cubic centimeter (g/cm 3 ), where C(t)=0.2(1+3e −0.3t) What is the drug concentration after 10 seconds? What is the rate of change between 30 and 45 seconds (g/cm3/sec) How long does it take for the drug concentration to reach 0.24 g/cm 3?
Answers
It takes about 15.02 seconds for the drug concentration to reach 0.24 g/cm3.
Drug concentration after 10 seconds:
C(t)= 0.2(1 + 3e^-0.3t)
Given t = 10 seconds
C(10) = 0.2 (1 + 3e^-0.3*10)≈ 0.75 g/cm32.
Rate of change between 30 and 45 seconds (g/cm3/sec)
Rate of change of C with respect to t is given by d
C/dt = -0.18e^-0.3t
When t = 30,dC/dt = -0.18e^-0.3*30 = -0.0104 g/cm3/sec
When t = 45,dC/dt = -0.18e^-0.3*45 = -0.0015 g/cm3/sec3.
Time taken for drug concentration to reach 0.24 g/cm3
To find the time it takes for the drug concentration to reach 0.24 g/cm3,
we solve the equation C(t) = 0.24 g/cm3 for t.
C(t) = 0.2 (1 + 3e^-0.3t)0.24
= 0.2 (1 + 3e^-0.3t)1.2
= 1 + 3e^-0.3t0.2
= 3e^-0.3tln(0.2/3)
= -0.3tln(0.2) - ln(3)
= -0.3tln(3) + ln(0.2)
= 0.3tApproximately, t
≈ 15.02 seconds,
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4. All of the following are examples of natural causes of air pollution
except -
hurricans
factory emissions
forest fires
tornadoes
ANSWER PLEASE AND THANK YOU☺️(bless you btw)
Answers
Answer:
factory emissions
Explanation:
which of the following would reagents would oxidize Zn to Zn^2+, but not Fe to Fe3^+
a) Ca^2+
b)Br2
c)Co
d)Ca
e)Br^-
f)Co^2+
Answers
The reagent that would oxidize Zn to Zn^2+ but not Fe to Fe^3+ among the options provided is (e) Br^-.
Br^- (bromide ion) can oxidize zinc (Zn) to zinc(II) ion (Zn^2+) by accepting electrons from Zn. The reaction would proceed as follows:
Zn(s) + 2Br^-(aq) → Zn^2+(aq) + Br2(l or aq)
On the other hand, Fe(II) ions (Fe^2+) can be oxidized to Fe(III) ions (Fe^3+) by bromide ions (Br^-) in a redox reaction:
2Fe^2+(aq) + Br2(l or aq) → 2Fe^3+(aq) + 2Br^-(aq)
Therefore, Br^- would oxidize Zn to Zn^2+ but also oxidize Fe to Fe^3+. Among the options provided, there is no reagent that selectively oxidizes Zn to Zn^2+ without also oxidizing Fe to Fe^3+.
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How would you change the type of atom
Answers
Answer:
Hi, There! :)
If you change the number of protons an atom has, you change the type of element it is. If you change the number of neutrons an atom has, you make an isotope of that element.
Answer:
If you change the number of protons an atom has, you change the type of element it is. If you change the number of neutrons an atom has, you make an isotope of that element. All known elements are arranged on a chart called the Periodic Table of Elements.
Explanation:
that's what I found buddy
What causes rain to precipitate from clouds?
Answers
Answer: Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.
Explanation: Have a blessed day!
Answer: Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.
Explanation:hope this helps u
Which statement about covalent compounds is FALSE?
Covalent compounds can contain as little as
a 2 atoms or as many as several thousand
atoms.
b
Covalent compounds can contain a maximum
of 4 different atoms.
C
Covalent compounds are held together by
covalent bonds.
d Covalent compounds contain only nonmetals.
Answers
Answer: b . Covalent compounds can contain a maximum of 4 different atoms.
Explanation:
The covalent compounds are those compounds that are formed between the non-metals via sharing of electrons. The bonds so formed between these non-metallic atoms are covalent. There can be two or several different kinds of atoms that can form covalent bonds with each other in a single molecule. They use the valence electrons for sharing. The maximum number of valence electrons can be seven.
Answer:
b.Covalent compounds can contain a maximum of 4 different atoms.
Explanation:
Covalent compounds can contain as little as the Covalent compounds can contain a maximum of 4 different atoms.
Covalent bonds are bonds formed between non-metals by the sharing of electrons. The bonds formed between these non-metal atoms in this way are covalent bonds. There can be two or more different types of atoms within a single molecule that can form covalent bonds with each other.Therefore , the correct answer is B.
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b. 239/94 Pu 4/2 He +
Answers
Answer:
im thinking its 362x
Explanation:
A chemical reaction causes the chemical compositions of substances to change. Reactants are substances that enter into a reaction, and products are substances produced by the reaction
Which of the following are the reactants for this simulation? Select all that apply.
Answers
The statements which is true about the reactants from the given simulation above is: It involves the breaking of chemical bonds.
The correct answer choice is option c
How does reactants involved in the breaking of chemical bonds?For a chemical reaction to occur, the bond between the reacting substances breaks either by covalent or electrovalent bonding in order to form new substance.
So therefore, reactants usually break chemical bonds duringchemical reaction.
Complete question:
A chemical reaction causes the chemical compositions of substances to change. Reactants are substances that enter into a reaction, and products are substances produced by the reaction
Which of the following are the reactants for this simulation? Select all that apply
a. A chemical reaction results to formation of new bonds
b. A chemical reaction involves the formation of new substance.
c. It involves the breaking of chemical bonds
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The ___________________ is an early theory which states that our solar system was formed by the gravitational collapse of a massive giant cloud.
A) Nebular Theory
B) Capture Theory
C) Proto-planet Theory
D) Schmidt-Lyttleton accretion theory
Answers
Answer: A) Nebular Theory
Explanation:
Answer:
A)
Explanation:
How many moles of Ba(NO3)2 are there in 0.25 L of a 2.00 M Ba(NO3)2 solution?
Use Molarity equals StartFraction moles of solute over liters of solution EndFraction..
0.13 mol
0.50 mol
2.25 mol
8.0 mol
Answers
Answer:
0.5moles
Explanation:
Given parameters:
Volume of solution= 0.25L
Molarity of solution = 2.00M
Unknown:
Number of moles = ?
Solution:
To solve this problem;
Molarity is the number of moles of solute in a given volume of solution, so
Number of moles = molarity x volume
Now insert the parameters and solve;
Number of moles = 0.25 x 2 = 0.5moles
Answer:
b
Explanation:
got it right on test
Please answer these questions.. please
Answers
explanation
You have 8.65 x 10^25 atoms of arsenic. How many grams do you have
Answers
Answer:
10,765 g As
Explanation:
Explain what it means to be considered a “renewable” energy source, and what it means to be a “non-renewable” energy source.
Answers
Answer: Resources are characterized as renewable or nonrenewable
- a renewable resource can replenish itself at the rate it is used such as solar energy, wind energy, hydro energy, and tidal energy.
- a nonrenewable resource has a limited supply such as coal, gas, nuclear energy, and fossil fuels.