Because they move in a horizontal path
Explanation;P waves or the primary waves are the first waves to arrive during an earthquake. They are the fastest waves created by an earthquake.P waves travel through the interior of the earth and an pass through both solid and molten rock. These waves are also known as compressional waves due to their pulling and pushing. When particles are subjected to a P wave they move in the same direction as the wave motion which is the direction of energy travel.Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O).
Final answer:
Propane's complete combustion reaction with oxygen producing carbon dioxide and water is a chemical process, representing a typical exothermic combustion reaction used for heat generation.
Explanation:
The combustion of propane (C3H8) in the presence of oxygen (O2) to produce carbon dioxide (CO2) and water vapor (H2O) is a chemical reaction that involves the breaking and forming of chemical bonds.
The balanced chemical equation for this reaction is:
C3H8 + 5O2 -> 3CO2 + 4H2OThe balanced chemical equation for the complete combustion of propane is C3H8 + 5O2 → 3CO2 + 4H2O. This reaction is exothermic, releasing heat energy which is why propane is commonly used as a fuel source.
A chemist finds that when platinum is added to a reaction, the reaction speeds up. He thinks the platinum may be acting as a catalyst. What measurement should the chemist make to determine whether it is a catalyst?
Measure the mass of the platinum before and after the reaction.
Measure the temperature of the solution before and after the reaction.
Measure the change in volume of the solution.
Measure the amount of gas released by the reaction.
Answer: Option (a) is the correct answer.
Explanation:
A substance that does not get consumed in a chemical reaction and helps in increasing rate of the reaction by lowering the activation energy is known as a catalyst.
Hence, when the chemist finds that reaction speeds up when platinum is added into the reaction then the chemist must calculate or measure the mass of platinum before and after the completion of reaction.
This is because if there occurs change in the mass of platinum then it means that platinum is not acting as a catalyst in the reaction.
Thus, we can conclude that chemist must measure the mass of the platinum to determine whether it is a catalyst.
Drag each label to the correct category. Systems are classified as human-made or natural. Match each example to the correct type of system. solar systemtelephone systemplant root systemhuman digestive systemcity transit systemwater purification system
Explanation:
Systems which occur in the nature on their own are known as natural system. On the other hand, systems which are made by human beings are known as human-made systems.
Therefore, classifying given systems as follows.
Natural systems are:
Solar systemPlant root systemHuman digestive systemHuman-made system are:
TelephoneCity transit systemWater purification systemwhat are the advantages of using a computer over a graphing calculator
when organism convert forms of energy what usually results
helium is the lightest monatomic element is this a chemical property
The observations and results of Thomson’s cathode ray experiment led to what change to the atomic model?
"the addition of negatively charged electrons" is the answer.
In the important industrial process for producing ammonia (the Haber Process), the overall reaction is: N2(g) + 3H2(g) → 2NH3(g) + 100.4 kJ A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure. This reaction is:
exothermic
endothermic
Answer:
Exothermic
Explanation:
From the perspective of thermodynamics, chemical reactions can be broadly
classified as endothermic and exothermic reactions.
Endothermic reactions are accompanied by the absorption of heat and have a negative value for the reaction enthalpy i.e. ΔH is negative. In contrast, exothermic reactions are accompanied by the release of heat and have a positive value for the reaction enthalpy i.e. ΔH is positive.
The given reaction is:
[tex]N2(g) + 3H2(g)---- 2NH3(g) + 100.4 kJ[/tex]
Based on the above reaction, production of NH3 is accompanied by the release of 100.4 kJ of heat, hence this is an exothermic reaction.
difference between core science and double science ( ENGLAND GCSE OCR EXAM BOARD)
Core science provides a basic understanding of key scientific concepts, while double science goes further in depth and grants two GCSE qualifications upon completion. The choice between the two often depends on a student's academic and career aspirations in the field of science.
Explanation:The main difference between core science and double science as part of the England GCSE OCR exam board involves the extent of the curriculum covered and the number of GCSE qualifications granted upon completion.
Core Science is a single award course which delivers one GCSE qualification. This course provides a broad and basic understanding of key scientific concepts, covering aspects of Biology, Chemistry, and Physics.
On the other hand, Double Science, also known as Combined Science, awards two GCSE qualifications. It covers a more extensive curriculum, diving deeper into the subjects of Biology, Chemistry, and Physics. This might be the preferred choice for students wishing to pursue sciences at A-level or beyond, as it provides a more comprehensive foundation in these subject areas.
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Which statement best describes the process that the diagrams show?
A.) A solid loses kinetic energy to become a liquid and then becomes a gas.
B.) A solid gains kinetic energy to become a liquid and then becomes a gas.
C.) A gas loses kinetic energy to become a liquid and then becomes a solid.
D.) A gas gains kinetic energy to become a liquid and then becomes a solid.
B. This looks like ice turning to water then to steam
Answer is: B.) A solid gains kinetic energy to become a liquid and then becomes a gas.
Stage 2 is melting (from solid to liquid) and Stage 2 is boiling (from liquid to gas).
In solid, molecules are closely packed, stiff and do not changes of shape or volume. Solid object does not take on the shape of its container.
Liquids have definite volume, but no fixed shape.
Gases not have definite volume and fixed shape, it depends on its container.
Because solubility is a characteristic property of matter, it can be used to help identify a substance. t or f
This is a true statement.
In an experiment, a student gently heated a hydrated copper compound to remove the water of hydration. the following data was recorded:
1. mass of the crucible, cover and contents before heating 23.4g.
2. mass of empty crucible and cover.
3. mass of crucible, cover, and contents after heating to constant mass 20.94g
All energy waves other than the visible light spectrum cannot be seen. true or false
how many molecules are in 12.5g of water (H20)
The number of molecules in 12.5 g water is equal to 4.18 × 10²³ molecules.
What is Avogadro's number?Avogadro’s constant can be defined as the proportionality constant that uses to count the number of constituents such as ions, molecules, and atoms in the amount of substance in a sample.
Avogadro's constant can be defined as the approximate number of nucleons per gram of substance. The value of the Avogadro number is the mass of 1 mole of a compound, in grams, and is equal to the number of nucleons in 1 constituent particle.
The value of Avogadro’s constant is experimentally found to be approximately equal to 6.022×10²³ per mole.
The mass of the water = 12.5 g
The molar mass of the water = 18 g
The number of moles of the water = 12.5/18 = 0.694 mol
The number of molecules of water in one mole = 6.022 × 10²³
Number of molecules of water in 0.694 mol = 6.022 × 10²³× 0.694
= 4.18 × 10²³ molecules
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Intrusive igneous rocks _____. form from confining pressure cool quickly on Earth's surface cool slowly beneath Earth's surface form layers called foliations
Answer:cool slowly beneath Earths surface
Explanation:
Answer:
cool slowly beneath Earth's surface
Explanation:
is MgCO3 an base or acid
How many grams of CuSO4 would be needed to make 150 mL of 0.300 M CuSO4 solution?
[tex]\boxed{{\text{7}}{\text{.182 g}}}[/tex] of [tex]{\text{CuS}}{{\text{O}}_{\text{4}}}[/tex] would be needed to make 150 mL of 0.300 M [tex]{\text{CuS}}{{\text{O}}_4}[/tex] solution.
Further Explanation:
The proportion of substance in the mixture is called concentration. The most commonly used concentration terms are as follows:
1. Molarity (M)
2. Molality (m)
3. Mole fraction (X)
4. Parts per million (ppm)
5. Mass percent ((w/w) %)
6. Volume percent ((v/v) %)
Molarity is a concentration term that is defined as the number of moles of solute dissolved in one litre of the solution. It is denoted by M and its unit is mol/L.
The formula to calculate the molarity of [tex]{\text{CuS}}{{\text{O}}_4}[/tex] solution is as follows:
[tex]{\text{Molarity of CuS}}{{\text{O}}_4}\;{\text{solution}}=\dfrac{{{\text{Moles}}\;{\text{of}}\;{\text{CuS}}{{\text{O}}_4}}}{{{\text{Volume }}\left( {\text{L}}\right){\text{ of}}\;{\text{CuS}}{{\text{O}}_4}\;{\text{solution}}}}[/tex] ......(1)
Rearrange equation (1) to calculate the moles of [tex]{\text{CuS}}{{\text{O}}_4}[/tex].
[tex]{\text{Moles}}\;{\text{of}}\;{\text{CuS}}{{\text{O}}_4}= \left( {{\text{Molarity of HN}}{{\text{O}}_3}\;{\text{solution}}} \right)\left( {{\text{Volume of}}\;{\text{CuS}}{{\text{O}}_4}\;{\text{solution}}} \right)[/tex] ......(2)
The volume of [tex]{\text{CuS}}{{\text{O}}_4}[/tex] solution is to be converted into L. The conversion factor for this is,
[tex]{\text{1 mL}} = {10^{ - 3}}\;{\text{L}}[/tex]
So the volume of [tex]{\text{CuS}}{{\text{O}}_4}[/tex] solution is calculated as follows:
[tex]\begin{aligned}{\text{Volume of CuS}}{{\text{O}}_4}\;{\text{solution}}&= \left( {{\text{150 mL}}}\right)\left({\frac{{{{10}^{ - 3}}\;{\text{L}}}}{{{\text{1 mL}}}}} \right)\\&= 0.15{\text{ L}}\\\end{aligned}[/tex]
The molarity of [tex]{\text{CuS}}{{\text{O}}_4}[/tex] solution is 0.300 M.
The volume of [tex]{\text{CuS}}{{\text{O}}_4}[/tex] solution is 0.15 L.
Substitute these values in equation (2).
[tex]\begin{aligned}{\text{Moles}}\;{\text{of}}\;{\text{CuS}}{{\text{O}}_4}&=\left( {{\text{0}}{\text{.300 M}}} \right)\left( {0.15{\text{ L}}}\right)\\&= 0.04{\text{5 mol}}\\\end{aligned}[/tex]
The formula to calculate the mass of [tex]{\text{CuS}}{{\text{O}}_4}[/tex] is as follows:
[tex]{\text{Mass of CuS}}{{\text{O}}_{\text{4}}}=\left( {{\text{Moles of CuS}}{{\text{O}}_{\text{4}}}} \right)\left( {{\text{Molar mass of CuS}}{{\text{O}}_{\text{4}}}} \right)[/tex] ......(3)
Substitute 0.045 mol for the moles of [tex]{\text{CuS}}{{\text{O}}_4}[/tex] and 159.609 g/mol for the molar mass of [tex]{\text{CuS}}{{\text{O}}_4}[/tex] in equation (3).
[tex]\begin{aligned}{\text{Mass of CuS}}{{\text{O}}_{\text{4}}}&= \left({{\text{0}}{\text{.045 mol}}} \right)\left( {\frac{{{\text{159}}{\text{.609 g}}}}{{{\text{1 mol}}}}}\right)\\&= 7.1824{\text{05 g}}\\&\approx {\text{7}}{\text{.182 g}}\\\end{aligned}[/tex]
Therefore the mass of [tex]{\mathbf{CuS}}{{\mathbf{O}}_{\mathbf{4}}}[/tex] is 7.182 g.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Concentration terms
Keywords: molarity, CuSO4, dilution, moles of CuSO4, volume, solution, 0.045 mol, 150 mL, 0.300 M, 7.182 g, 159.609 g/mol, 0.15 L.
exhaled air contains 16% oxygen by volume. Assuming you exhale like the average person does during strenuous exercise (that is, you exhale 1L of air per breath and you exhale 40 breaths per minute) ad assuming the dive will take 90 minutes, what volume of oxygen will you end up exhaling?
Which is a way that the model of the atom became more accurate due to new investigations? Select one: A. Experiments showed that the atom is made of smaller particles. B. Neutrons were detected orbiting the nucleus. C. Cathode-ray tube experiments showed that the atom is indivisible. D. Thomson showed that the atom contains alpha particles.
Answer: The correct answer would 100% be A. Experiments showed that the atom is made of smaller particles.
just took the test and got it right
What percent of the energy used produced radioactive waste
How much energy is required to melt a 500. gram block of iron? The heat of vaporization is 6090 J/g and the heat of fusion is 247 J/g.
In a laboratory experiment, pure lead metal reacted with excess sulfur to produce a lead sulfide compound. The following data was collected: Mass of empty evaporating dish: 25.000 g Mass of evaporating dish and lead metal: 26.927 g Mass of evaporating dish and lead sulfide: 27.485 g Solve for the empirical formula of the lead sulfide compound. Be sure to show, or explain, all of your calculations.
Which of the following metals is most reactive?
A. aluminum
B. sodium
C. copper
D. calcium
An unknown quantity of gas is held at a temperature of 295 K in a container with a volume of 25 L and a pressure of 742 kPa. How many moles of gas are in the container?
Answer:
7.56 moles
Explanation:
For a 742 kPa, we can consider the gas as an ideal gas because it will be close to 7 atm (1 kPa = 0.01 atm), which is low pressure. So, the ideal gas equation is:
PV = nRT
Where P is the pressure, V is the volume, n the number of moles, R the gas constant and T the temperature (always in Kelvin). For pressure in kPa and volume in liters, R = 8.314 kPa.L/mol.K, then:
742x25 = nx8.314x295
2452.63n = 18550
n = 18550/2452.63
n = 7.56 moles
Which of these redox reactions is spontaneous as written?
Pb + Fe3+ → Pb2+ + Fe
Fe + Mg2+ → Fe3+ + Mg
H2 + Al3+ → H+ + Al
Zn + Ag+ → Zn2+ + Ag
Answer:
Zn + Ag+ → Zn2+ + Ag
Explanation:
Plato
The statement of the redox reactions is spontaneous as "[tex]Zn + Ag^{+}[/tex]→ [tex]Zn^{2+} + Ag[/tex] ".
What is redox reaction?A redox reaction is the process in which electrons are exchanged between two reactants that are involved. The oxidation number of a molecule, atom, or ion varies as a result of gaining or losing an electron.
If the standard electrode potential for the redox reaction, [tex]E^{0}[/tex], is positive, the redox reaction is spontaneous. That means, the reaction will move forward if [tex]E^{0}[/tex] is positive. In this reaction, silver ion is the oxidizing agent that readily accepts the electron to attain (stable configuration) the metal state, while Zn is a reducing agent which loses electrons (i.e., oxidized) by causing a reduction. It proceeds with[tex]E^{0}[/tex] redox reaction as given, the reaction moves forward and is considered to be spontaneous.
Hence the correct answer is [tex]Zn + Ag^{+}[/tex] → [tex]Zn^{2+} + Ag[/tex].
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Which of these reactions involves an acid and a covalent base?
A. HF + KOH → H2O + KF
B. H2SO4 + 2NaOH → Na2SO4 + 2H2O
C. HNO3 + Al(OH)3 → Al(NO3)3 + H2O
D. H2SO4 + 2H2O → 2H3O+ + SO42–
E. chemical equilibrium
What is the frequency of a 6.14 x 10^4 m wave
Which explains the change in ionized energy that occurs between removing the first and second electrons from an Atom?
Answer:
B. The ionization energy increases because the ratio of the protons to electrons increases.
Explanation:
edg 2021
A gas with a volume of 4.0 L at 90.0 kPa expands until the pressure drops to 20.0 kPa. What is its new volume if the temperature doesn't change?
The new volume of the gas can be calculated using Boyle's law of gases. The volume of the gas when pressure drops from 90 kpa to 20 kpa, increases from 4 L to 18 L.
What is Boyle's law?Boyle's law states that, at constant temperature, the volume of a gas is inversely proportional to the pressure of the gas.
hence, PV = a constant.
Let P1 and V1 be the initial pressure and volume and P2 and V2 be the final pressure and volume, then
P1 V1 = P2V2.
Given that,
P1 = 90 kPa
P2 = 20 kPa
V1 = 4 L
V2 = P1 V1/P2
= (90kPa × 4 L)/20 kPa
= 18 L.
Therefore, the final volume of the gas will be 18 L.
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The specific heat of gasoline is 2.22 J/g•°C. How much heat would it take to raise 35.0 G of gasoline to 3.00°C?