Answer: Option (A) is the correct answer.
Explanation:
When we place two objects of different temperature adjacent to each other then there will occur transfer of heat from hotter object to colder object till their temperature becomes equal.
This process is known as conduction.
For example, a metal spoon placed in hot coffee cup then heat will flow from coffee to the cup.
Convection is defined as the process in which a fluid (liquid or gas) when heated then more dense (cooler) substance sinks ate the bottom whereas less dense (hotter) substance will rises at the top.
This intermixing of the substances tends to generate convection currents and this process is known as convection.
Radiation is defined as an electromagnetic energy which travels in space in the form of waves or particles.
This means that heat energy will always travel from a warmer object to a colder object.
Thus, we can conclude that heat ALWAYS flows from warmer objects to cooler objects, is a true statement about heat transfer through conduction, convection, or radiation.
The statement 'heat ALWAYS flows from warmer objects to cooler objects' is TRUE about heat transfer through conduction, convection, or radiation (Option A).
Heat transfer refers to the field that studies how heat is generated, converted, and exchanged between different physical objects.When two different materials that have different temperatures enter in contact, the heat is always transferred from the warmer to the cooler.This principle about heat transfer can also be applied when two objects/materials are mixed.In conclusion, the statement 'heat ALWAYS flows from warmer objects to cooler objects' is TRUE about heat transfer through conduction, convection, or radiation (Option A).
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How did Mendeleev arrange the known elements in his periodic table?
Mendeleev was the first scientist to classify elements into what called the periodic table. However, unlike the modern periodic table that we use today, Mendeleev classified elements based on the mass number and not by atomic number.
What is periodic table ?Periodic table classify all known elements into different groups and periods. The vertical columns in the table are called groups and the horizontal rows are called periods. All the elements are classified based on their atomic number in the modern periodic table.
At the time of Mendeleev there were only 65 to 70 known elements. He classified these elements based on their mass number. The periodicity of these elements and their classification into groups all were based on their mass number.
However, later Mosely found that, the properties of an atom is purely based on their atomic number and not by mass numbers. He forwarded the modern periodic table based on the atomic number of elements.
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How is compound different from a mixture?
A. it is made of one substance
B. it cannot be made of organic materials
C. it cannot be broken down
D. it cannot be separated by a physical change
The Doppler effect changes the
A) Frequency due to motion
B) Speed of sound due to motion
C) Speed of light due to motion
D) Radar waves in a police car
Which of the following rate constants corresponds to the reaction that converts reactants to products in the least amount of time? A. 4.48 x 10-5 min-1 B. 4.48 x 10-5 s-1 C. 0.0547 s-1 D. 0.0547 min-1
Which of the following best describes the conditions created by El Niño? When is that normally blowup to east get stronger waters off the coast of north America cool down and upwelling increases in proving the nutrients in the water. Wednesday normally blood to the west get stronger waters off the coast of South America cool down and upwelling increases improving the nutrients in water. When is the normally blowup to the west slacken waters off the coast of South America walk up and upwelling decreases reducing the nutrients in the water
which three factors are most important in determining the composition of ocean water
The three main factors that help in determining the composition of ocean water are temperature, salinity, and density.
The temperature helps in determining the rate of evaporation of the sea. Next factor is salinity, it helps in knowing the salty nature of the ocean, and helps in identifying the other essential factor of ocean water, that is, density. The density is one of the most essential factors, as ocean having more salt composition are less dense in comparison to those having less salt.
Use the particle theory of matter to explain why icing sugar dissolves more rapidly than granular sugar.
Icing sugar dissolves in water faster than granular sugar because it has a larger surface area, which enhances interactions with solvent molecules, thus speeding up dissolution. Stirring and temperature also affect the rate of dissolution but icing sugar's fine particles inherently dissolve quicker.
Using the particle theory of matter, we can explain why icing sugar dissolves more rapidly than granular sugar. The rate at which a solute dissolves is influenced by the surface area exposed to the solvent. Icing sugar, being finely ground, has a much larger surface area compared to granuler sugar, allowing for more interactions between the sugar particles and the water molecules, leading to a faster rate of dissolution.
Agitation of the solution can also increase the rate at which sugar dissolves. Stirring introduces fresh solvent molecules to the solute, enhancing dissolution by preventing saturation at the interface. This principle applies to both icing and granular sugars but is more pronounced with larger particles like those found in granular sugar.
The dissolving process, or rate of dissolution, is enhanced not only by increasing surface area and agitation but also by temperature. Hot water will dissolve sugar faster than cold water due to the increased energy, which in turn increases the frequency and energy of collisions between solvent and solute particles.
Balance this compound
Answer: The balanced chemical equation is given by,
[tex]2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O[/tex]
Explanation:
[tex]C_2H_6+O_2\rightarrow CO_2+H_2O[/tex]
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
So, the balanced chemical equation is given by, will writing stoichiometric coefficient 2 in front of ethane , 7 in front of oxygen , 4 in front of carbon dioxide gas and 6 in front of water.
[tex]2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O[/tex]
According to reaction, 2 moles of ethane reacts with 7 moles of oxygen to give 4 moles f carbon dioxide gas and 6 moles of water.
True or False: The atoms that make up the element oxygen are exactly the same as the atoms that make up the element hydrogen.
A.
True
B.
False
The statement that atoms that make up the element oxygen are exactly the same as the atoms that make up the element hydrogen is False.
This is because, all atom of different element are unique, and elements are all the different types of atoms.
What is an atom?An atom can be regarded as the smallest unit of ordinary matter which is required in making chemical element.
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how do you tell by the formula that an element on the periodic table is a metal
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describe the difference in structure between beH2 and CaH2
the gram formula mass of a compound is 48 grams. the mass of 1.0 mole of this compound is
what is the approximate ratio of neutrons to protons in a nucleus of radon -222
More protons in the nucleus need more neutrons to bind the nucleus together. The graph below is a plot of the number of neutrons versus the number of protons in various stable isotopes. The stable nuclei are in the pink band known as the belt of stability. They have a neutron/proton ratio between 1:1 and 1.5.
The ratio of neutrons to protons in Radon-222 has been found to be 1.58.
The radon has been the radioactive element. The atomic number of the element has been 222. The element has been consisted of 86 protons.
The number of neutrons and protons has been the mass of the nucleus and has been consisted of the atomic mass of the element. In an isotope, the element has 222 as the atomic number.
Since. Atomic number = Neutrons + Protons
222 = Neutrons + 86
Neutrons = 136
The ratio of neutrons to protons can be given as:
[tex]\rm \dfrac{Neutrons}{Protons}[/tex] = [tex]\rm \dfrac{136}{86}[/tex]
[tex]\rm \dfrac{Neutrons}{Protons}[/tex] = 1.58
The ratio of neutrons to protons in Radon-222 has been found to be 1.58.
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Why are two changes of state of the refrigerant necessary to operate a refrigerator?
The two changes of state of the refrigerant are necessary to operate a refrigerator because liquid refrigerant must evaporate and cool.
What is refrigerator?A refrigerator is a heat engine in which work is done on a refrigerant substance in order to collect energy from a cold region and exhaust it in a higher temperature region, thereby further cooling the cold region.
What is liquid refrigerant?The liquid refrigerant is used for heat transfer in a refrigeration system, which absorbs heat at a low temperature and low pressure and rejects heat at a higher temperature and a higher pressure.
Explain refrigeration cycle?This cycle is based on the process of changing the physical state of the liquid refrigerant (from liquid to gas and vice versa). These substances condense to liquid at high pressures and evaporate to gases) at low pressures. The cold in cooling systems happens due to the change of state of this liquid refrigerant fluid to gas.This process depends on the work done by the compressor – which uses mechanical energy to compress the liquid refrigerant from the evaporator in the gas phase.With this compression, the pressure and temperature of the liquid refrigerant increases. When it enters the condenser, the refrigerant transfer the heat to the environment, causing its temperature to decrease and condensation occurs, which is the process of phase change from gas to liquid.After that, the liquid refrigerant passes through the control element – capillary tube or expansion valve – which, by narrowing the passage, slows its speed on the evaporator, causing its pressure to decrease. The liquid refrigerant arrives on the liquid state and under low pressure to the evaporator, during which it is changing phase again, from liquid to gas. When you change phase, it absorbs the heat present in the conditioned items in the refrigerator case and returns to the compressor, restarting the refrigeration cycle.The liquid refrigerant must evaporate (change from a liquid to a gas) and cool. This process releases heat. The cool gas is pumped through tubes so that it can absorb heat from the interior of the refrigerator, keeping it away from the food. Then the gas must condense into a liquid so that it can release the absorbed heat to the outside and begin the cycle again.
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A globe is placed on your desk and you are asked to identify its physical properties. How would you describe the globe?
A globe is a spherical model that precisely represents the Earth's geography with a true-scale size and shape of continents and oceans, but it has limitations such as being less portable and not showing all sides simultaneously.
To describe the physical properties of a globe placed on a desk, one would note several characteristics. A globe is a spherical representation of the Earth, including details such as continents, countries, and geographical features like mountains and oceans. It is equipped with a geographic coordinate system and a scale which helps to maintain accurate distances and proportions between locations. Due to its shape, a globe provides a distortion-free representation of Earth's geography, preserving both the size and shape of landmasses and bodies of water. However, a globe has limitations as it is not as portable as flat maps, cannot be viewed entirely at once, and cannot be easily stored in compact spaces. Moreover, while globes provide a true-to-scale representation of the Earth, they cannot be easily enlarged to show detailed views of specific areas.
what is sodium polycrylate
Consider this reaction. What volume (in milliliters) of oxygen gas is required to react with 4.03 g of Mg at STP? 1860 mL 2880 mL 3710 mL 45,100 mL
Answer: 1860 mL
Explanation:
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
According to Avogadro's law , 1 mole of every gas occupies 22.4 L at standard temperature and pressure and 1 mole of every substance weighs equal to its molar mass.
[tex]2moles=2\times 24.305=48.61g[/tex] of Magnesium reacts with 22.4 L of oxygen gas STP.
4.03g of Magnesium reacts with=[tex]\frac{22.4L}{48.61g}\times 4.03g=1.86L=1860ml[/tex] of oxygen gas STP.
does the author succed in persuading you to accept his argument?
She is flying in windless conditions along the equator what is the area c called
Which property of an object changes when an unbalanced force acts on it?
A. Mass
B. Inertia
C. Velocity
D. Temperature
Answer:
velocity is the answer i just did this quiz
In two or more complete sentences, describe two differences between electromagnetic waves and mechanical waves.
How does the energy from the sun help the tree in the process of photosynthesis?
A.chlorophyll in the leaves capture the suns energy and uses it to make food from carbon dioxide from the atmosphere and water through the roots
B.the tree captures the energy from the sun, making its leaves and bark too hot for predators to eat
C.the tree absorbs most of the suns heat so that the animals may survive in an atmosphere where the temperature is much less
D.the tree does not rely on the suns energy in any way
what is one result of meiosis?
A person who is interested in the role of genetics in health might pursue a career in
A)endocrinology
B)gene therapy
C)neuroscience
D)sports medicine
In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products? kinetic energy closed systems law of conservation electromagnetic energy
Answer : The correct option is, Kinetic energy.
Explanation :
According to the kinetic energy, the kinetic energy is directly proportional to the mass of an object and the square of the velocity of an object.
The formula of kinetic energy is,
[tex]K.E=\frac{1}{2}\times m\times v^2[/tex]
where,
K.E = kinetic energy
m = mass of an object
v = velocity of an object
From this we conclude that there is a direct relationship between the kinetic energy and the mass of an object.
As per question, the reactant have a mass of 10 grams and contains energy 1000 J and the product have a mass of 5 grams and contains energy 500 J that means as the mass of an object decreases, the kinetic energy is also decreases.
Hence, the correct option is, Kinetic energy.
Answer:
C. law of conservation of energy
This is the correct answer on edge.
A series circuit contains two devices, one with a resistance of 10 ohms and one with a resistance of 4 ohms. If the generator supplies a voltage of 42 V, what is the magnitude of the current? P
Answer : The magnitude of the current is, 3 ampere
Solution :
In a series circuit, the total resistance will be,
[tex]R=R_1+R_2[/tex]
[tex]R=10\Omega +4\Omega =14\Omega[/tex]
Using coulomb's law,
[tex]V=I\times R\\\\I=\frac{V}{R}[/tex]
where,
V = voltage = 42 V
I = electric current
R = resistance = 14 ohms
Now put all the given values in the above formula, we get
[tex]I=\frac{42V}{14\Omega}=3ampere[/tex]
Therefore, the magnitude of the current is, 3 ampere
Nitrogen can ionically bond with an unknown element X from group 2. How many ions of element X are required to create a stable ionic compound with nitrogen? A) 2 B) 3 C) 4 D) There is not enough information.
Answer is: B) 3.
Nitrogen (nonmetal) in this compound has oxidation number -3 and element X (metal) has oxidation number +2.
Smallest common multiple for 3 and 2 is 6.
number of nitrogen atoms = 6 ÷ 3.
number of nitrogen atoms = 2, there are two nitrogen atoms.
number of atom X: 6 ÷ 2 = 3.
For example, Mg₃N₂ is magnesium nitride. Nitrogen has -3 oxidation number and magnesium has oxidation number +2.
what causes the salinity of ocean water to decrease
Answer:
The salinity of the sea decreases due to an increase in fresh water in the ocean from the melting of the polar ice caps.
Explanation:
Ocean water can become saltier or fresher depending on environmental factors.
Melted ice, fresh water, will decrease the salinity of the oceans. That is, the process of oceanic desalination or decrease in salinity, known as freshening, is generated by the discharge of fresh water from the ice of glaciers into the salty water of the seas that surround it.
Why is the deuterium-tritium reaction the most promising nuclear fusion reaction for future energy production?
Answer:
The most promising of the nuclear fusions reactions for the future is the deuterium-tritium fusion, it comprises the deuterium cycle in which an amalgamation of tritium and deuterium takes place. The reaction produces an enormous energy of 17.6 MeV, however, to attain fusion there is a need to infiltrate the coulomb barrier with the help of tunneling, needing very high temperatures.