Answer:D. It is released as heat and light.
Explanation:
Energy cannot be created nor destroyed but can be converted from one form to another. This is the law of the conservation of energy. Energy is stored in the wax. When the wax is burnt, that energy is converted to another form of energy. In this case heat and light. Energy exists in various forms in nature. Energy is always converted from one form to another.
How many atoms of oxygen are in 8.43 g of magnesium sulfate heptahydrate (Epsom salts)?How many atoms of oxygen are in 8.43 g of magnesium sulfate heptahydrate (Epsom salts)?
Answer: The number of oxygen atoms in given amount of magnesium sulfate heptahydrate is [tex]2.265\times 10^{23}[/tex]
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Given mass of magnesium sulfate heptahydrate = 8.43 g
Molar mass of magnesium sulfate heptahydrate = 246.47 g/mol
Putting values in above equation, we get:
[tex]\text{Moles of magnesium sulfate heptahydrate}=\frac{8.43g}{246.47g/mol}=0.0342mol[/tex]
The chemical formula of magnesium sulfate heptahydrate is [tex]MgSO_4.7H_2O[/tex]
1 mole of magnesium sulfate heptahydrate contains 1 mole of magnesium atoms, 1 mole of sulfur atoms, 11 moles of oxygen atoms and 14 moles of hydrogen atoms
According to mole concept:
1 mole of a compound contains [tex]6.022\times 10^{23}[/tex] number of particles
So, 0.0342 moles of magnesium sulfate heptahydrate will contain = [tex](11\times 0.0342\times 6.022\times 10^{23})=2.265\times 10^{23}[/tex] number of oxygen atoms
Hence, the number of oxygen atoms in given amount of magnesium sulfate heptahydrate is [tex]2.265\times 10^{23}[/tex]
How much Ca3(PO4)2(s) could be produced in an industrial process if 55.00g of CaCl2 In solution reacted completely wth sufficient Na3(PO4)(aq)
If 55g of CaCl2 reacts completely with sufficient Na3PO4, approximately 232.5 g of Ca3(PO4)2 could be produced in an industrial process.
Explanation:To calculate how much Ca3(PO4)2 could be produced, we need to first know the reaction between CaCl2 and Na3PO4. The balanced equation for this reaction is:
2CaCl2 (aq) + Na3PO4 (aq) -> 3Ca3(PO4)2 (s) + 6NaCl (aq)
From this, we can see that 2 moles of CaCl2 react to form 3 moles of Ca3(PO4)2.
Now let's use stoichiometry to do the calculation. First, calculate the number of moles of CaCl2. The molar mass of CaCl2 is approximately 111 g/mol, so 55g of CaCl2 is about 0.5 moles.
According to the balanced equation, 0.5 moles of CaCl2 will produce 0.75 moles of Ca3(PO4)2. The molar mass of Ca3(PO4)2 is about 310 g/mol, so 0.75 moles of Ca3(PO4)2 is about 232.5 g.
In conclusion: If 55g of CaCl2 reacts completely with sufficient Na3PO4, approximately 232.5 g of Ca3(PO4)2 could be produced in an industrial process.
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How can humans decrease the rate of endangered or extinct species? Question 4 options: Introduce new predators to an environment. Minimize habitat destruction. Pollute other environments. Create and populate more zoos.
The answer is B: Minimize Habitat Destruction
What is similar between Gregor's life before and after his physical transformation?
A. He still supports his family financially
B. He is still happy that he has a nice famiky who lives him.
C. He still feels bored and unsatisfied with his life.
D. He is still excited to see what will happen each day.
The similarity between Gregor's life before and after his physical transformation is that,
He is still happy that he has a nice family who lives him.What is physical transformation and how changes occur?The changes occur only by physically is called physical transformation.The changes occurs are,
Reactions SkinHeightWeightsexual organbrainTeeth etc.learn about physical transformation,
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jordan's puppy has a mass of 5480 milligrams , what is the puppy's mass in grams ?
Final answer:
To convert the mass of Jordan's puppy from milligrams to grams, divide the mass in milligrams by 1000. The puppy has a mass of 5.48 grams.
Explanation:
To convert the mass of Jordan's puppy from milligrams to grams, we need to divide the mass in milligrams by 1000. This is because there are 1000 milligrams in 1 gram.
So, to convert 5480 milligrams to grams, we divide 5480 by 1000:
5480 mg ÷ 1000 = 5.48 g
Therefore, Jordan's puppy has a mass of 5.48 grams.
How does a nuclear power plant produce electricity?
A. Quickly moving neutrons coming out of the reaction create a gas which turns a turbine that produces electricity.
B. Quickly moving neutrons coming out of the reaction are slowed down by water. The water heats up and turns into steam. The steam turns the turbine and produces electricity.
C. Quickly moving neutrons coming out of nuclear reactions are used to turn turbines that produce electricity.
D. Quickly moving neutrons give their kinetic energy to the surrounding water. The water's energy is then used to turn turbines and produce electricity.
The Answer Is B.Quickly moving neutrons coming out of the reaction are slowed down by water. The water heats up and turns into steam. The steam turns the turbine and produces electricity.
which of these statements does not refer to radiation
A. some of this energy is is reflected off earths atmosphere
B.warm air rises and takes heat with it eventually it cools and sinks
C.sunlight travels through space without aid of fluids or solids
D.land and ocean absorb and re-emit heat from the sun
Please help quick
The answer is: B.warm air rises and takes heat with it eventually it cools and sinks.
Solar radiation is the source of electric energy.
The thermal radiation is electromagnetic radiation generated by the thermal motion of charged particles in matter.
Heat spontaneously flows from a hotter to a colder body.
The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.
Radiative zone is around the inner core and in this area energy is transported by radiation.
Answer: B.warm air rises and takes heat with it eventually it cools and sinks
Explanation: There are three modes of heat transfer:
1. Conduction: This type of heat transfer happens when there is direct contact between the two object.
2. Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) in which convection currents are produced due to the movement of hot fluid upwards and cold fluid downwards. This happens as the density of hot fluid decreases and thus it moves upwards.
3. Radiation: This type of heat transfer happens when there is direct transfer of energy through space.
Warm air rises and takes heat with it eventually it cools and sinks is an example of convection and not radiation.
why do people use block and teckle systems to move heavy objects?
Which letter is closest to the warm front, and which is closest to the cold front
Heat is an exchange of internal energy from one system to another due to
A. a temperature difference between the systems.
B. one system being gas and the other being solid.
C. the systems having the same temperature.
D. one system being liquid and the other being solid.
This is ether physics or chemistry i don't know
Find the pressure, in atmosphere, exerted by a mixture which contains three gases with partial pressures of 448 torr, 321 mm Hg and 1.72 atm
What is the most stable condition for an atom
Mr X was accused of speeding along a highway. He was travelling at different speeds,but an average speed of 80 km/h. Based on thr given information, is Mr X gulity or innocent?
Sulfur is to the immediate right of phosphorus in the same row in the periodic table. Which of the following statements compares the radius and number of protons of nitrogen and oxygen atoms?
Sulfur has a smaller radius and one more proton than phosphorous.
Sulfur has a smaller radius and one proton less than phosphorous.
Sulfur has a larger radius and one proton less than phosphorous.
Sulfur has a larger radius and one proton more than phosphorous.
Phosphorus (P) belongs to group 15 in the periodic table with atomic number = 15
Sulfur (S) belongs to group 16 in the periodic table with atomic number = 16
Now:
Atomic number = Number of protons present in an element
Therefore:
# protons in P = 15
# protons in S = 16
Now, on moving from left to right across the periodic table, the atomic radius decreases. This is because, as the atomic number increases, the nuclear charge also increases due to which the added electron feels a stronger pull towards the nucleus.
Based on the above, S will have a smaller radius and one more proton than P
Ans:A)
Chemical and physical properties are used to help identify substances. A substance's chemical properties identify whether or not that substance reacts with another substance. What chemical property is present in substances that react slowly to oxygen?
Chemical and physical properties are used to help identify substances. A substance's chemical properties identify whether or not that substance reacts with another substance or it can be said that a chemical property of a substance will helps in deciding whether the substance will react or not with another substance. To react with oxygen, the substance should have the ability to burn, the more quickly the substance burn, more readily the substance will burn to produce light and heat.
This can also be explained with the formation of rust on a chemical compound, The more readily the compound reacts with oxygen, more readily it undergoes rusting .
For example when iron kept in open air, it undergoes rust as it reacts with oxygen.
Four friends were talking about how matter and energy move through an ecosystem. This is what they said:
Will - "I think only energy cycles through an ecosystem."
Mike - "I think only matter cycles through an ecosystem."
Dustin - "I think both matter and energy cycle through an ecosystem."
Lucas - "I think neither matter nor energy cycles through an ecosystem."
Which friend do you most agree with? EXPLAIN your thinking.
Final answer:
Dustin's statement that both matter and energy cycle through an ecosystem is the most accurate, as energy flows through an ecosystem and is lost as heat, while matter is recirculated via biogeochemical cycles.
Explanation:
Among the statements made by the four friends regarding how matter and energy move through an ecosystem, Dustin's statement aligns most closely with scientific understanding. Energy enters an ecosystem from external sources, primarily the sun, and flows through the ecosystem from producers to consumers in a one-way path, ultimately being lost as heat. Unlike energy, matter, such as water, carbon, and nitrogen, is recycled within the ecosystem through biogeochemical cycles. These cycles involve both living organisms and non-living matter, ensuring that matter is continually used and reused within the ecosystem.
What most likely happens when water vapor cools? A. It changes into gas. B. It changes into liquid. C. Its temperature increases. D. Its temperature remains constant.
Answer: Option (B) is the correct answer.
Explanation:
When water converts from vapor form to liquid form then this process is known as condensation.
Water vapors are the gaseous form of water, that is, its molecules are weakly held by Vander waal forces.
When temperature is decreased then water vapor converts into liquid form.
Thus, we can conclude that when water vapor cools then most likely it changes into liquid.
According to the forces of attraction, when vapor cools it changes to liquid thus option B is correct.
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Thus, when vapor cools it changes to liquid thus option B is correct.
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Blank is anything that has mass and volume.
Final answer:
Matter is anything that occupies space and has mass. Solids, liquids, and gases are all forms of matter. Mass is a measure of the amount of material within an object, while volume is the measure of the physical space it occupies.
Explanation:
Matter is defined as anything that occupies space and has mass. Solids and liquids are more obviously matter: We can see that they take up space, and their weight tells us that they have mass. Gases are also matter; if gases did not take up space, a balloon would not inflate (increase its volume) when filled with gas.
Mass is a measure of the amount of material within an object. The quantity or amount of matter in an object is determined by the numbers of atoms and molecules of various types it contains.
The volume of an object is the measure of the physical space it occupies. Volume is measured in cubic units, such as cubic centimeters or liters. The volume is the "size" of an object.
Suppose a grill lighter contains 50.0 g of butane. How many grams of butane in the lighter would have to be burned to produce 17.9 L of carbon dioxide at STP
Answer is: mass of burned butane is 11.6 g.
Chemical reaction: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O.
m(butane) = 50,0 g.
V(CO₂) = 17,9 L.
n(CO₂) = V(CO₂) ÷
Vm.
n(CO₂) = 17,9 L ÷ 22,4 L/mol.
n(CO₂) = 0,8 mol.
From chemical reaction n(CO₂) :
n(C₄H₁₀) = 8 : 2.
n(C₄H₁₀) =
0,8 mol ÷ 4.
n(C₄H₁₀) =
0,2 mol.
m(C₄H₁₀) =
n(C₄H₁₀) · M(C₄H₁₀).
m(C₄H₁₀) =
0,2 mol · 58 g/mol.
m(C₄H₁₀) =
11,6 g.
How can a permanent magnet make the light bulb glow
A permanent magnet can make a light bulb glow by making it move as to convert kinetic and magnetic energy into electric current. Both energy combined in a coil of copper wire causes the electrons in the wire to move then create an electric current and make the light bulb glow.
Moreover, this process is called electromagnetic induction where there is a creation of potential difference or voltage through an electric conductor, such as coil of wire, when it is exposed to a varying or moving magnetic field. As long as the conductor is part of a closed circuit, current will flow through it whenever it crosses lines of force in the magnetic field. The faster the magnet or coil moves, the greater the amount of electric current is produced. If more turns were added to the coil or a stronger magnet were used, this would produce more current too.
2 molecules of Acetaldehyde can only be made from which of these alkenes?
how many moles of sodium are needed to react with sulfuric acid to produce 3.75 moles of sodium sulfate according to the following unbalanced reaction :
Relate metallic bonds to the properties of metals.
Metallic bonds contribute to the characteristic properties of metals such as electrical and heat conductivity, malleability, ductility, luster, high melting points, and density due to the free movement of valence electrons and the strong attraction between metal ions and these electrons.
Explanation:The Relationship Between Metallic Bonds and Metal Properties
Metallic bonds are the force of attraction between positively charged metal ions and the valence electrons that surround them. This creates a lattice-like structure where electrons are free to move. This electrical conductivity is due to electrons being able to flow through the metal, allowing it to carry an electric current. Similarly, the close packing of positive nuclei in metals enables efficient heat conduction.
Metallic bonds also give metals their malleability (the ability to be hammered into sheets) and ductility (the capacity to be stretched into wires), because the layers of atoms can slide past each other without breaking the metallic bonds. The sharing of valence electrons among a sea of metal ions also accounts for the metals' characteristic luster, as electrons absorb and re-emit light energy.
Due to the strength of the metallic bonds, metals typically exhibit high melting points. The tight packing of the atomic structure, resultant from these bonds, also explains the high density commonly associated with metallic substances. Furthermore, metals often form cations in compounds due to the ease with which they can lose valence electrons, a trait that is tied to their metallic bonding nature.
Metallic bonds form a 'sea of electrons' that accounts for the unique properties of metals. This includes high electrical and thermal conductivity, malleability, ductility, and metallic lustre. Examples of metals with these properties are aluminum, copper, and iron.
Metallic Bonds and Properties of Metals:
Metallic bonds are formed between metal atoms due to the unique electronic structure of metals. These bonds are characterized by a 'sea of electrons' where valence electrons are free to move around the fixed cations. This freedom of electrons accounts for various properties of metals.
High electrical conductivity: The free-moving electrons allow metals to easily conduct electricity.High thermal conductivity: Metals can efficiently transfer heat because of the same free electrons.Malleability and ductility: The ability to move and rearrange without breaking bonds allows metals to be hammered into sheets and drawn into wires.Metallic lustre: The movement of electrons gives metals their shiny appearance.High melting points and density: Strong bond interactions contribute to these properties.Examples include aluminum, copper, and iron, each demonstrating these characteristic features due to metallic bonding.
Calculate the molarity of 90.0 mL of a solution that is 0.92 % by mass NaCl. Assume the density of the solution is the same as pure water.
Final answer:
To calculate the molarity of a 0.92% NaCl solution with a volume of 90.0 mL, convert the mass percentage to grams, turn grams to moles using the molar mass of NaCl, and divide by the volume in liters to find the molarity, which is 0.158 M.
Explanation:
The question asks to calculate the molarity of a 0.92% by mass NaCl solution with a volume of 90.0 mL and assuming the density is that of pure water. To solve this, we perform the following steps:
Calculate the mass of NaCl in 90.0 mL of the solution using the percentage by mass. Since the density of water is approximately 1 g/mL, 90.0 mL of the solution also has a mass of 90.0 g. Therefore, the mass of NaCl in the solution would be 0.92% of 90.0 g, which equals 0.828 g.Convert the mass of NaCl to moles using NaCl's molar mass. The formula mass of NaCl is 58.44 g/mol. Thus, the number of moles of NaCl is 0.828 g / 58.44 g/mol = 0.0142 moles.Convert the volume of the solution to liters, as molarity is defined as moles per liter. Here, 90.0 mL = 0.090 L.Finally, calculate the molarity by dividing the moles of NaCl by the volume of the solution in liters. Molarity = 0.0142 moles / 0.090 L = 0.158 M (molar).Final answer:
To find the molarity of a 90.0 mL NaCl solution that is 0.92% by mass, convert the mass of NaCl to moles using its molar mass, and then divide by the volume in liters. The molarity of the solution is 0.158 M.
Explanation:
To calculate the molarity of a 90.0 mL NaCl solution that is 0.92% by mass, we first need to determine the mass of NaCl in the solution. Since the solution is similar in density to water, we can assume it is 1 g/mL.
This means that 90.0 mL of the solution has a mass of 90.0 g. To find the mass of NaCl:
Mass of NaCl = 0.92% of 90.0 g = 0.0092 × 90.0 g = 0.828 g
Next, we convert the mass of NaCl to moles:
Moles of NaCl = Mass of NaCl / Molar mass of NaCl
Moles of NaCl = 0.828 g / 58.44 g/mol = 0.0142 mol
Finally, we convert from grams to moles to find the molarity:
Molarity (M) = Moles of NaCl / Volume of solution in liters
Molarity (M) = 0.0142 mol / 0.090 L = 0.158 M
which feature form the longest-mountain range on Earth?
KCl(aq) + AgF(aq) → AgCl(s) + KF(aq)
If 0.25 moles of potassium chloride are consumed completely, how many moles of potassium fluoride will be produced?
A)
1.0 mole
B)
0.25 moles
Eliminate
C)
0.50 moles
D)
There is no way to tell because we do not have enough information
It is the same answer as in the question so the answer is b
In a chromatography experiment, chlorophyll pigments are separated using paper. What is the stationary phase in this experiment?
Answer:
Chromatography paper.
Explanation:
Chromatography may be defined as the technique used for the separation of molecules on the basis of their size, shape and color. The chromatography requires the mobile phase as well as the stationary phase.
The different pigments of chlorophyll can be separated by the chromatography technique. Here, the chromatography paper work as stationary phase and the drop of cholorophyll is placed on the paper. The water is used as mobile phase and as it moves over the paper separates the component of cholorophyll.
Thus, the answer is chromatography paper.
At area 1, a stream empties into the ocean. At area 2, precipitation enters the ocean in the form of rainfall. At area 3, evaporation takes place at the ocean’s surface. In which areas does the salinity of the ocean decrease?
Answer:
1 and 2
Explanation:
i just took the exam on plato, plus its common sense and it cannot be 3 because it has nothing to do with it.
The salinity of the ocean decreases at area 1, where a stream flows into it, and at area 2, where rainfall adds freshwater. Evaporation at area 3 increases salinity as only water is removed, not the salts.
The areas where the salinity of the ocean decreases are areas where freshwater is added to the ocean. At area 1, where a stream empties into the ocean, freshwater from the stream mixes with saltwater, diluting the salinity. Similarly, at area 2, when precipitation such as rain enters the ocean, it also lowers the salinity because rainwater has lower salt content compared to ocean water. On the other hand, at area 3, where evaporation occurs, water is removed from the ocean leaving the salts behind, which actually increases the ocean's salinity.
Salinity is a key component of the water cycle and the ocean's composition. The saltwater in the oceans is highly saline, with about 35,000 mg of dissolved ions per liter. When freshwater, which has lower salinity, enters the ocean, it causes a decrease in the overall salinity of the ocean at the point of entry. In contrast, evaporation of ocean water leaves the salts behind, resulting in increased salinity.
This food chain is incomplete. Two groups of organisms are missing. One group of organisms that is missing are the producers, plants and other photosynthetic organisms. They turn sunlight into chemical energy. What is the other missing group and what do they do? A) Carnivores that eat only meat. B) Herbivores that eat only plants. C) Predators that prey on all other levels of consumers. D) Decomposers that recycle matter back into the food chain.
The other missing group in the food chain mentioned is 'Decomposers'. They break down dead organisms and waste materials into basic nutrients which return to the soil, supporting the growth of producers like plants.
Explanation:Yes, the other missing group in this incomplete food chain is indeed the Decomposers. Decomposers, which include bacteria, fungi, and certain types of insects and worms, perform a crucial role in the food chain. They break down dead animals, plants, and waste materials, converting them back into basic nutrients and matter. This process of recycling matter allows these nutrients to return to the soil, which, in turn, supports the growth of producers like plants.
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When sugar and iron filings are mixed together, you can separate them using a magnet. When sugar and iron filings are mixed and then heated until a chemical reaction occurs, you can A) still separate the iron filings with a magnet. B) no longer separate the iron filings with a magnet. C) sift the mixture to separate out the sugar from the iron. D) dissolve the sugar in water to separate it from the iron.
Answer:
The answer is D. dissolve the sugar in water to separate it from the iron.
Explanation:
hope this helps :)
The component from a mixture can be separated using some methods based on the individual properties.The heating iron and sugar will lead a chemical change and they cannot be separated then using a magnet or by dissolving in water.Thus option B is correct.
What is magnetic separation?Some components which are magnetically susceptible can be separated from a mixture . Especially materials containing iron can be separated using a magnet.
During a chemical change, chemical bonds will break and form new products. Heating will make a material undergo some chemical changes. When iron and sugar are heated they both melt if higher temperature is applied.
Iron forms compound with sugar molecules, thus it cannot be separated using a magnet after heating. Both iron and sugar are soluble in water. Therefore, separation by dissolving in water is possible here. Hence option B is correct
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