Answer: C EXOTHERMIC
Explanation:
Answer: C
Explanation:
26. Which waves have wavelengths longer than those of visible light? Give an example of how each kind
of wave is used.
Answer:
Infrared radiation lies between the visible and microwave portions of the electromagnetic spectrum. Infrared waves have wavelengths longer than visible and shorter than microwaves, and have frequencies which are lower than visible and higher than microwaves.
Explanation:
How can you tell for sure that a redox reaction has happened?
Answer:
Determine the value of the oxidation numbers of atoms or ions on the reactant side and the product side.
Explanation:
A redox reaction involves some ions, and atoms losing electrons and other gaining them in the same reaction. When oxidation occurs, there is loss of electrons by an element thus its oxidation number increases; becomes more positive. When reduction occurs an element gains electrons and the oxidation number becomes more negative; reduces.
If an element (s) behaves in this manner in the whole reaction, then be sure to deduce that a redox reaction has occurred.
Answer:
If oxidation state changes, it is a redox reaction
Explanation:
An automobile tire at 30°C has a pressure of 3.00 atm. Temperature decreases to -5°C. Assume that there is no volume change in the tire.
What is the new pressure of the tire after the temperature change?
? atm
Answer:
2.65 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and V are constant, and have different values of P and T:(P₁T₂) = (P₂T₁).
P₁ = 3.0 atm, T₁ = 30°C + 273 = 303 K,
P₂ = ??? atm, T₂ = -5°C + 273 = 268 K.
∴ P₂ = (P₁T₂)/(T₁) = (3.0 atm)(268 K)/(303 K) = 2.65 atm.
In the equation below, suppose 11 grams of zinc react with 12 grams of hydrogen chloride to form 16 grams of zinc chloride and an unknown amount of hydrogen gas.
Zn + 2HCl → ZnCl2 + H2
Based on the Law of Conservation of Mass, how many grams of hydrogen gas will form?
A:1 gram
B:7 grams
C:19 grams
For apex The answer is b
In the equation Zn + 2HCl → ZnCl₂ + H₂, suppose 11 grams of zinc react with 12 grams of hydrogen chloride to form 16 grams of zinc chloride and an unknown amount of hydrogen gas. 7 grams of hydrogen gas will form. Therefore, option B is correct.
What is zinc ?With the atomic number 30 and the symbol Zn, zinc is a chemical element. When the oxidation is removed, zinc transforms into a shiny-greyish metal that is slightly brittle at normal temperature. It is the first element in the periodic table's group 12
Oysters are the best source of zinc, but it is also abundant in red meat and fowl. Beans, almonds, crab, lobster, whole grains, breakfast cereals, and dairy products are additional excellent sources.
A non-metal hydrogen is displaced by a metal zinc in a single displacement reaction. As a reductant metal, zinc (Zn) dispenses hydrogen (H₂) from an aqueous solution of HCl to produce zinc chloride (ZnCl2) and hydrogen gas (H₂).
Thus, 7 grams of hydrogen gas will form, option B is correct.
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the volume of a gas is proportional to number of moles of a gas is known as
Answer:
A modern statement is: Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.
Answer:
Pressure - Inversely proportional to volume.
Pressure & Volume - Directly proportional to the number of moles.
Volume - Standard is 22.4L.
Temperature - Directly proportional to the average kinetic energy. and Standard is 273K.
All - Relationship determined by Ideal Gas Law.
Rob and Carla observed two trails of dogs' footprints in the mud. The spacing between the footprints in one set was markedly larger than in the other. Rob concluded that one of the dogs must have been bigger than the other. However, Carla had a different explanation.
Which is the BEST alternative to Rob's conclusion?
A) The two dogs were of different ages.
B) One of the dogs was in search of food.
C) The two dogs were of different species.
D) One of the dogs ran faster than the other.
Answer: Option (D) is the correct answer.
Explanation:
When a dog runs faster then due to more force applied by the foot there occurs large footprints of the dog.
Spaces between the feet of dog increases due to running faster as running makes an individual to take long steps.
Whereas when a dog walks normally then his footprints will be smaller in size.
Therefore, we can conclude that the BEST alternative to Rob's conclusion is that one of the dogs ran faster than the other.
During an experiment, 102 grams of calcium carbonate react with an excess amount of hydrochloric acid. If the percent yield of the reaction was 85.15%, what was the amount of calcium chloride formed?
Answer:
96.31 g.
Explanation:
From the balanced reaction:CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O,
1.0 mole of CaCO₃ reacts with 2.0 moles of HCl to produce 1.0 mole of CaCl₂, 1.0 mole of CO₂, and 1.0 mole of H₂O.
We need to calculate the no. of moles of (104 g) of CaCO₃:no. of moles of CaCO₃ = mass/molar mass = (102 g)/(100.08 g/mol) = 1.019 mol.
Using cross multiplication:
1.0 mole of CaCO₃ produce → 1.0 mole of CaCl₂.
∴ 1.019 mole of CaCO₃ produce → 1.019 mole of CaCl₂.
∴ The amount of CaCl₂ produced = no. of moles x molar mass = (1.019 mol)(110.98 g/mol) = 113.1 g.
∵ percent yield of the reaction = [(actual yield)/(theoretical yield)] x 100.
Percent yield of the reaction = 85.15%, theoretical yield = 113.1 g.
∴ actual yield = [(percent yield of the reaction)(theoretical yield)]/100 = [(85.15%)(113.1 g)] / 100 = 96.31 g.
Answer:
96.3
Explanation:
took test
the mass of 2.50 moles of calcium fluoride (CaF2) is how many grams ?
Answer:
195.199grams
Explanation:
Fluorine has a molar mass of 18.99984 while calcium has a molar mass of calcium is 40.08.
1 mole of calcium fluoride has a mass of 40.08+2×18.99984
=78.0797 grams
if one mole has a mass of 78.0797 grams, then 2.5 moles have:
2.5 moles× 78.0797 grams/mole= 195.1992 grams
Answer:
195
Explanation:
First, calculate the molar mass of CaF2:
Ca: 1 × 40.078 g/mol = 40.078 g/mol
F: 2 × 18.998 g/mol = 37.996 g/mol
40.078 g/mol + 37.996 g/mol = 78.074 g/mol CaF2
Then, convert moles to grams by multiplying the number of moles by the molar mass:
2.50 mol CaF2 × 78.074 g/mol CaF2 = 195 g CaF2
If gas is initially at 350L and 500k then changes to 295K what is the new volume
The answer is:
The new volume is equal to 206.5 L.
Why?To solve this problem, we need to assume that the pressure is constant, and use the Charle's Law equation, so, solving we have:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
We are given:
[tex]V_1=350L\\T_1=500K\\T_2=295K[/tex]
Then, using the Charle's Law equation, we have:
[tex]\frac{350L}{500K}=\frac{V_2}{295K}[/tex]
[tex]\frac{350L}{500K}=\frac{V_2}{295K}\\\\V_2=\frac{350L}{500K}*295K=206.5L[/tex]
Hence, we have that the new volume is equal to 206.5 L.
Have a nice day!
In ___ waves combine so that the resulting wave is bigger than the largest of the original waves?
Answer:
The answer is...
Explanation:
Constructive Interference
Answer:
[tex]\boxed{\text{phase}}[/tex]
Explanation:
When two waves are in phase, their peaks and troughs line up.
They undergo constructive interference, and the amplitude of the resulting wave is larger than either of the individual waves.
In the diagram below, the two red waves are in phase, and they combine to give a new wave (green) with a greater amplitude.
Which is the first element in the periodic table to have an electron configuration in the 4th energy level? beryllium carbon potassium titanium
titanium electronic configuration
3d2 4S2
Answer:
The answer is: Potassium because is the first element in period four.
Explanation:
Ok, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. Since 1s can only hold two electrons, the next 2 electrons are in the 2s orbital. Then put six in the 2p orbital and put the next two electrons in the 3s. Now, move to the 3p where it is place the next six electrons. Then shift to the 4s orbital where we place the remaining one electron. Therefore the Potassium electron configuration will be:
[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{1}[/tex]
what is the total number of moles present in a 526.0-gram sample of NaNCO3(s)?
Answer:
6.26 mol.
Explanation:
We have the relation:no. of moles (n) = mass/molar mass.
mass of NaHCO₃ = 526.0 g, Molar mass of NaHCO₃ = 84.007 g/mol
∴ no. of moles (n) of NaHCO₃ = mass/molar mass = (526.0 g)/(84.007 g/mol) = 6.26 mol.
What are the two processes underlying this image that turn peat into coal
Answer:
Peatification and coalification
Explanation:
https://energyeducation.ca/encyclopedia/Coal_formation
Answer: Option (D)
Explanation: In order to form coal, two processes might be undergone and they are as follows-
Peatification- It is the process by which the remains of trees and plants undergoes partial decomposition in a swampy type of environment, conserving organic matter. It is the first stage of coal formation.Coalification- It is the process of complete transformation of the dead remains of plants and trees into coal.Thus the correct answer is option (D).
Radiation occurs when
energy is transferred by electromagnetic waves.
Answer:
thermal
Explanation:
I can confirm that the answer you have to type down is thermal.
What is the charge of the neutron
Answer:
Neutral (no net charge)
Explanation:
Protons - Positive
Electrons - Negative
Neutrons - No charge
Why?
Neutrons are the particle in an atom with a (as the name suggests) neutral charge. They are neither positive nor negative, unlike protons or electrons.
The atomic number of an atom is??
Number of protons in the nucleus of an atom.
Answer:
The Atomic Number of an atom is the number of protons it contains (which are located in the nucleus of the atom).
What type of hydrocarbon is 2-octene, and what about the structure allows 2-octene to be classified as this type of hydrocarbon?
an alkene because there is a double bond
Final answer:
2-Octene is an alkene, a type of unsaturated aliphatic hydrocarbon with a double bond between the second and third carbon atoms in its eight-carbon chain. The double bond's position is what allows us to classify it as an alkene, in line with its general formula CnH2n.
Explanation:
A hydrocarbon is defined as a compound composed entirely of hydrogen and carbon atoms. The two general types of hydrocarbons are aliphatic and aromatic hydrocarbons. Aliphatic hydrocarbons are further subdivided into alkanes, alkenes, and alkynes. Alkanes are hydrocarbons with only single bonds, alkenes contain one or more double bonds, and alkynes contain one or more triple bonds.
2-Octene is an example of an alkene, which is a type of unsaturated aliphatic hydrocarbon. The term '2-octene' indicates that the hydrocarbon has eight carbon atoms (oct-) and a double bond (--ene) between the second and third carbon atoms, as implied by the number '2' in its name. The presence of this double bond is what allows us to classify 2-octene as an alkene, and its molecular formula can be approximated as CnH2n, which fits the general formula of alkenes.
Which of the following requires the most energy to get started?
A. A nuclear fusion reaction
B. Radioactive decay
C. A chemical reaction
D. A nuclear fission reaction
Answer: it's c
Explanation:
Among nuclear fusion reaction, radioactive decay, nuclear fission reaction, and a chemical reaction, a nuclear fusion reaction requires the most energy to get started.
Explanation:Out of the options provided, a nuclear fusion reaction requires the most energy to get started. Fusion is the process where two light atomic nuclei combine to form a heavier nucleus. This process releases a tremendous amount of energy, but initiating it requires significant energy to overcome the electrostatic forces repelling the positively charged nuclei. In comparison, radioactive decay, a nuclear fission reaction, and a chemical reaction require less initial energy as they generally occur spontaneously under the right conditions.
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Please can any one help me by answering this question!!+ignore my answer!,
I have posted the answetr in this picture.
How would 0.073 be written in scientific notation
Answer:
7.3
⋅
10
−
2
Explanation:
Answer:yo yo
Explanation:
123
Block mountains form along which type of geological landform?
A. Fault blocks
B. The asthenosphere
C. Rift valleys
D. Orogenic belts
Answer:
A. Fault blocks
Explanation:
The block mountains are formed by pieces of the crust that breaks down and pieces are pushed up by the movement of the crust around them. These type of mountains usually have a steep and a slope side, due to the irregular nature of the fracture. Example of such mountains are the Sierra Nevada mountains in North-America.
They're not caused by the collision of two tectonic plates, like most of the mountains of our planet.
Answer: A. fault blocks
Explanation: Fault-block Mountains - Fault-block mountains are formed along fault lines (the edge between plates).
The huge chunks of rock on either side of the fault are called fault blocks. As the tectonic plates
move, some of the fault blocks are pushed up, while others are pushed down. This difference in
elevation (height) forms fault block mountains. The Sierra Nevada Mountains in the western United
States are fault-block mountains.
Which structural feature will differ among an ester, an alcohol, and an aldehyde, regardless of which examples are being compared?
the functional group
the branching pattern of the carbon chain
the number of carbon atoms
Answer:
The functional group
Explanation:
A functional group defines a hydrocarbon. an ester the functional group is an O- alkyl group while that one of an alcohol is -OH group. An aldehyde is a functional group on its own.
Answer: the functional group
Explanation:
Functional groups are specific group of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.
1. Esters have functional group [tex]-O=C-OR[/tex].
Example: methyl ethanoate with molecular formula [tex]CH_3COOCH_3[/tex]
2. Alcohols have functional group [tex]-OH[/tex].
Example: Propanol with molecular formula [tex]CH_3CH_2CH_2OH[/tex]
3. Aledydes have functional group [tex]-O=CH[/tex].
Example: propanal with molecular formula [tex]CH_3CH_2CHO[/tex]
Thus esters , alcohols and aldehydes may have same number of carbon atoms and similar branching pattern but different functional groups.
Balance the following redox equation, identifying the element oxidized and the element reduced. Show all of the work used to solve the problem.
HNO3 + P yields H3PO4 + NO
Will make brainliest!
Answer:
N is reduced; P is oxidized;
5HNO₃ + 2H₂O + 3P ⟶ 5NO + 3H₃PO₄
Explanation:
Probably the easiest way to balance the equation is to use the ion-electron method.
Step 1. Write the skeleton equation
HNO₃ + P ⟶ H₃PO₄ + NO
Step 2. Separate into two half-reactions.
HNO₃ ⟶ NO
P ⟶ H₃PO₄
Step 3. Balance all atoms other than H and O
Done
Step 4. Balance O by adding H₂O molecules to the deficient side.
HNO₃ ⟶ NO + 2H₂O
4H₂O + P ⟶ H₃PO₄
Step 5. Balance H by adding H⁺ ions to the deficient side.
3H⁺ + HNO₃ ⟶ NO + 2H₂O
4H₂O + P ⟶ H₃PO₄ + 5H⁺
Step 6. Balance charge by adding electrons to the deficient side.
3H⁺ + HNO₃ + 3e⁻ ⟶ NO + 2H₂O
4H₂O + P ⟶ H₃PO₄ + 5H⁺ + 5e⁻
The N atom is reduced because it gains electrons. The P atom is oxidized because it loses electrons.
Step 7. Multiply each half-reaction by a number to equalize the electrons transferred.
5 × [3H⁺ + HNO₃ + 3e⁻ ⟶ NO + 2H₂O]
3 × [4H₂O + P ⟶ H₃PO₄ + 5H⁺ + 5e⁻]
Step 8. Add the two half-reactions.
15H⁺ + 5HNO₃ + 15e⁻ ⟶ 5NO + 10H₂O
12H₂O + 3P ⟶ 3H₃PO₄ +15H⁺ + 15e⁻
15H⁺ + 5HNO₃ + 15e⁻ + 12H₂O + 3P ⟶ 5NO + 10H₂O + 3H₃PO₄ + 15H⁺ + 15e⁻
Step 9. Cancel species that occur on each side of the equation
15H⁺ + 5HNO₃ + 15e⁻ + 2(12)H₂O + 3P ⟶ 5NO + 10H₂O + 3H₃PO₄ + 15H⁺ + 15e⁻
becomes
5HNO₃ + 2H₂O + 3P ⟶ 5NO + 3H₃PO₄
Step 10. Check that all atoms are balanced.
[tex]\begin{array}{ccc}\textbf{Atom} & \textbf{On the left} & \textbf{On the right}\\\text{H} & 9 & 9\\\text{N} & 5 & 5\\\text{O} & 17 & 17\\\text{P} & 3 & 3\\\end{array}[/tex]
Step 11. Check that charge is balanced
[tex]\begin{array}{cc}\textbf{On the left} & \textbf{On the right}\\0 & 0\\\end{array}[/tex]
Everything checks. The balanced equation is
5HNO₃ + 2H₂O + 3P ⟶ 5NO + 3H₃PO₄
what kind of energy is required for photosynthesis to occur
Answer:
light energy to convert carbon dioxide and water into glucose and oxygen gas. Each molecule of glucose essentially “stores” up to 38 molecules of ATP which can be broken down and used during other cellular reactions.
Explanation:
Answer:
Plants use sunlight to make glucose.
Its solar energy. Plants use the sun for energy.
Hope This Helps! Have A Nice Day!!
how many moles of iron chloride are produced when 6 moles of chlorine gas react with excess iron
Answer:
12.0107
Explanation:
Hope this helps!
How do greenhouse gases in the atmosphere affect Earth’s temperature?
this is for my written response
Answer: The greenhouse gases cause Earth's surface to heat up from the sunlight.
Explanation: The greenhouse gases causes the Earth's surface to warm up in the morning and at night, the surface cools down. When it cools down, that gives the heat a chance to get back into the air, but some of the heat is trapped (which is caused by the greenhouse gases). That's why, on average, Earth stays at 58 degrees Fahrenheit.
If the amount of dark matter and energy is above the critical level, what will happen to the fate of the universe?
The universe will expand at an accelerated rate.
The expansion of the universe will stop, and its volume will remain the same.
The universe will stop expanding and collapse in a big crunch.
The expansion of the universe will slow but continue.
Answer:
I believe it is; The universe will stop expanding and collapse in a big crunch.
I may be wrong though so double check on that.
Explanation:
Answer:
The universe will stop expanding and collapse in a big crunch.
Explanation:
Ethene reacting with hydrogen gas would produce...
Your answer:
propane
ethane
ethyne
Answer:
Ethene reacting with hydrogen gas would produce ethane .
Explanation:
Hydrogenation of alkene gives alkane.
Hydrogenation of ethene gives the saturated hydrocarbon "ethane".
According to the equation:
C₂H₄ + H₂ → C₂H₆.
what is the frequency of a wave where 3 wavelenths pass 1 second
Answer:
3 Hz
The frequency is three waves per second, or 3 Hz.
HELP ASAP! GIVING BRAINLIEST!! 15 POINTS
Think about the process of raising a pendulum to one side and letting it go. For this event, create a list associated with the pendulum as it cycles from the choices below:
KINETIC ENERGY FORMS:
- Motion energy
- Thermal energy
- Electric energy
- Vibrational energy
- Radiant energy
POTENTIAL ENERGY FORMS:
- Gravitational Potential energy
- Elastic Potential energy
- Chemical Potential energy
- Electric Potential energy
- Magnetic Potential Energy
- Nuclear Potential energy
Answer:
1. Potential energy
2. Potential and kinetic energy
3. Kinetic energy
4. Potential and kinetic energy
5. Potential energy
Explanation:
As shown in picture <3 !!
The list associated with a pendulum as it cycles from the choices below are:
1. Potential energy.
2. Potential and kinetic energy.
3. Kinetic energy.
4. Potential and kinetic energy.
5. Potential energy.
What is potential and kinetic energy?Potential energy is the energy that is the saved in the still state of any object or stored form of energy before it starts to motion.
The kinetic energy is the energy used to perform any work or the energy used when any object is in motion.
Thus, the correct options are 1. Potential energy., 2. Potential and kinetic energy.3. Kinetic energy., 4. Potential and kinetic energy., 5. Potential energy.
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