What are three ways that carbon atoms can be arranged in hydrocarbon molecules?
Phosphorus has an atomic mass of 31 and an atomic number of 15, so the number of neutrons must be _______________.
sorry i'm late:
16 (how to get answer is shown below on second photo):
Which phase(s) would experience an increase in the rate of dissolution with an increase in temperature?
A. gases only
B. solids only
C. liquids only
D. both solids and liquids
Which substance is acting as the Brønsted-Lowry acid in the following chemical reaction? NH4 + OH- yields NH3 + H2O
A. NH4+
B. OH-
C. NH3
D. H2O
Night-vision goggles work by detecting ________ when it's dark outside.
A. visible light
B. radio waves
C. ultraviolet light
D. infrared radiation
Final answer:
Night-vision goggles use infrared radiation to create visible images in low light or total darkness by detecting the thermal energy emitted by objects, which is more intense in the infrared spectrum.
Explanation:
Night-vision goggles work by detecting infrared radiation when it's dark outside. This technology relies on the thermal energy emitted by objects, which is more intense in the infrared spectrum and is not visible to the human eye. Unlike visible light, infrared radiation can be detected in low-light conditions or even in total darkness, allowing night-vision devices to create a visible image for the user.
Infrared radiation is part of the electromagnetic spectrum. Your eyes cannot see infrared radiation, but it can be felt as warmth on the skin. For example, reptiles can detect infrared radiation emitted by their prey, even though it's outside the human visual spectrum. Night-vision technology harnesses this invisible radiation to provide visibility in the absence of light.
The correct answer to the question is therefore D. Infrared radiation.
Help! Brainliest will be given!
What is the product when Bismuth (symbol Bi, atomic number 83, and radioisotope with mass number of 214) emit an alpha particle?
Give the name (or symbol) of the new element, its atomic number, and its mass.
Answer : The correct answer is Name = Thallium (Th) , atomic mass = 210 and atomic number = 81 .
Alpha decay :
When atomic nucleus emits an alpha particle that process is known as alpha particle decay . The symbol of alpha particle is [tex] ^4_2He [/tex] . where 4 is atomic mass ( 2 protons + 2 neutrons ) and 2 atomic number .
When alpha particle is released the resultant nuclei (daughter nuclei) have 4 less atomic mass and 2 less atomic number .
Example for nuclear equation of alpha decay can be expressed as:
[tex] {_{90}^{230}Th} \rightarrow {_2^4He} + {_{88}^{226}Ra} [/tex]
Given :
Radioisotope = Bi Atomic mass = 214 Atomic number = 83
When it will release alpha particle , atomic mass will be decreased by 4 and atomic number by 2 .
Atomic mass = 214 - 4 = 210 Atomic number = 83-2 = 81
The atom with atomic number 81 is Thallium (Th) . Hence the daughter nuclei so produced is [tex] ^2^1^0_8_1Th [/tex]
The nuclear reaction can be written as :
[tex] ^{214}_{83}Bi \rightarrow _2^4He + _{81}^{210}Th [/tex]
We wish to dilute some 18.4 m h2so4 solution to make 600 ml of a 0.1 m h2so4 solution. how much of the 18.4 m solution should we start with?
We should start with approximately [tex]3.10 ml[/tex] of the [tex]18.4 M[/tex] [tex]H\(_2\)SO\(_4\)[/tex] solution to make [tex]600 ml[/tex] of a [tex]0.1 M[/tex] [tex]H\(_2\)SO\(_4\)[/tex] solution.
To solve this problem, we can use the dilution formula:
[tex]\[ C_1V_1 = C_2V_2 \][/tex]
where:
[tex]\( C_1 \)[/tex] is the concentration of the stock solution ([tex]18.4 M[/tex] [tex]H\(_2\)SO\(_4\)[/tex]).
[tex]\( V_1 \)[/tex] is the volume of the stock solution we need to use (unknown).
[tex]\( C_2 \)[/tex] is the concentration of the final solution ([tex]0.1 M[/tex] [tex]H\(_2\)SO\(_4\)[/tex]).
[tex]\( V_2 \)[/tex] is the volume of the final solution ([tex]600 ml[/tex] or [tex]0.6 L[/tex]).
We want to find [tex]\( V_1 \)[/tex], so we rearrange the formula:
[tex]\[ V_1 = \frac{C_2V_2}{C_1} \][/tex]
Now, plug in the values:
[tex]\[ V_1 = \frac{(0.1 \text{ M})(0.6 \text{ L})}{18.4 \text{ M}} \][/tex]
[tex]\[ V_1 = \frac{0.06}{18.4} \][/tex]
[tex]\[ V_1 =0.00326 \text{ L} \][/tex]
Since [tex]1 L = 1000 ml[/tex], we convert [tex]\( V_1 \)[/tex] to milliliters
[tex]\[ V_1 = 0.00326 \text{ L} \times 1000 \text{ ml/L} \][/tex]
[tex]\[ V_1 = 3.26 \text{ ml} \][/tex]
Rounding to two decimal places, we find that we need approximately [tex]3.10 ml[/tex] of the [tex]18.4 M[/tex] [tex]H\(_2\)SO\(_4\)[/tex] solution to make [tex]600 ml[/tex] of a [tex]0.1 M[/tex][tex]H\(_2\)SO\(_4\)[/tex] solution.
The ___ is the part of the solution that is dissolved and the ___ is the part of the solution that does the dissolving.
Determine the hydroxide ion concentration in a solution that is 0.0033 m hno3. answer in units of m.
What is the total number of electrons in all s orbitals of a neutral atom of phosphorus?
Ka for hcn is 4.9 ⋅ 10-10. what is the ph of a 0.068 m aqueous solution of sodium cyanide? ka for hcn is 4.9 10-10. what is the ph of a 0.068 m aqueous solution of sodium cyanide? 0.74 7.00 2.96 13.24 11.07
Answer
is: pH of solution of sodium cyanide is 11.07.
Chemical reaction 1: NaCN(aq) → CN⁻(aq) + Na⁺(aq).
Chemical reaction 2: CN⁻ + H₂O(l)
⇄ HCN(aq) + OH⁻(aq).
c(NaCN) = c(CN⁻) = 0.068 M.
Ka(HCN) = 4.9·10⁻¹⁰.
Kb(CN⁻) = 10⁻¹⁴ ÷ 4.9·10⁻¹⁰ = 2.04·10⁻⁵.
Kb = [HCN] · [OH⁻] / [CN⁻].
[HCN] · [OH⁻] = x.
[CN⁻]
= 0.068 M - x..
2.04·10⁻⁵ = x² / (0.068 M - x).
Solve quadratic equation: x = [OH⁻] = 0.00116 M.
pOH = -log(0.00116 M) = 2.93.
pH = 14 - 2.93 = 11.07.
The pH of the sodium cyanide solution is 11.56.
Let the cyanide ion be X
We have to set up the ICE table for the problem as follows;
X^-(aq) + H2O(l) ⇄ HX(aq) + OH^-(aq)
I 0.068 x x
C -x + x +x
E 0.068 - x x x
But Kb = Kw/Ka = 1 × 10^-14/4.9 × 10-10
Kb = 2 × 10^-4
So;
Kb = [HX] [OH^-]/[X^-]
2 × 10^-4 = x^2/ 0.068 - x
2 × 10^-4(0.068 - x) = x^2
1.36 × 10^-5 - 2 × 10^-4x = x^2
x^2 + 2 × 10^-4x - 1.36 × 10^-5 = 0
x= 0.0036 M
Since x = [OH^-] = 0.0036 M
pOH = - log(0.0036 M)
pOH = 2.44
pH = 14 - 2.44 = 11.56
The pH of the sodium cyanide solution is 11.56.
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how many grams of lithium are needed to produce 45.0 grams of lithium nitride, according to the following process?
6 Li(s) + N2(g) → 2 Li2N(s)
Which of the following best describes the changes involved in a fission reaction?
The nucleus of an atom splits into fragments, releasing a large amount of energy.
The nucleus of an atom splits into fragments, absorbing a large amount of energy.
The nuclei of two small atoms combine to form one larger nucleus, releasing a large amount of energy.
The nuclei of two small atoms combine to form one larger nucleus, absorbing a large amount of energy.
In a fission reaction, the nucleus of an atom splits into fragments, releasing a large amount of energy. Nuclear fission occurs when a heavy nucleus like uranium absorbs a neutron and splits, emitting additional neutrons, gamma rays, and energy.
The correct description of the changes involved in a fission reaction is: The nucleus of an atom splits into fragments, releasing a large amount of energy. Nuclear fission is a nuclear reaction where the nucleus of an atom, such as uranium-235 or plutonium-239, splits into smaller nuclei after absorbing a neutron.
This process produces additional free neutrons, gamma radiation, kinetic energy of fission fragments, and releases a significant amount of energy. The process is exothermic, and the energy released can be harnessed for electricity generation in nuclear reactors or can be used in nuclear weapons.
Nuclear fission differs from nuclear fusion, which is the combining of two smaller atomic nuclei to form a larger nucleus, also releasing energy. In both processes, large amounts of heat and radiation are emitted. However, for fission, a fissile material like uranium or plutonium is necessary to sustain the reaction, and it involves the breakup of a heavy nucleus into lighter elements.
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Which statement about the following reaction is correct?
CH4 (g) + 2O2 (g) yields CO2 (g) + 2H2O(l) deltaH = -890 kJ
reacting one mole of oxygen (O2) absorbs 445 kJ of energy
reacting one mole of oxygen (O2) releases 445 kJ of energy
reacting one mole of methane (CH4) absorbs 890 kJ of energy
reacting two moles of methane (CH4) releases 890 kJ of energy
Final answer:
The correct statement is that reacting one mole of oxygen (O2) releases 445 kJ of energy during the exothermic reaction of CH4 with O2.
Explanation:
The correct statement about the reaction CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O(l) ΔH = -890 kJ is that reacting one mole of oxygen (O2) releases 445 kJ of energy. The reaction is exothermic, meaning it releases energy. The ΔH value of -890 kJ means that for every mole of methane (CH4) that reacts, 890 kJ of energy is released. Considering the stoichiometry of the reaction, where 2 moles of oxygen react per mole of methane, half of the total energy release (which is 890 kJ) would be associated with 1 mole of oxygen, thereby releasing 445 kJ.
Which of the following are indicators of a chemical change? Select all that apply.
color change
temperature change
precipitate formation
gas formation
cutting a solid into smaller pieces
Which aqueous solution has the lowest freezing point c6h12o6, c2h5oh, ch3cooh, or nacl?
Among C₆H₁₂O₆, C₂H₅OH, CH₃COOH, and NaCl, NaCl is the one that will provide the aqueous solution with the lowest freezing point.
We have 4 aqueous solutions and we want to determine which has the lowest freezing point.
C₆H₁₂O₆C₂H₅OHCH₃COOHNaClWhat is the freezing point depression?Freezing-point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.
We can calculate the freezing point depression (ΔT) using the following expression.
ΔT = Kf × b × i
where,
Kf is the cryoscopic constant for water.b is the molality of the solution.i is the Van't Hoff factor.Assuming all the solutions have the same molality, the freezing point depression will be a function of the van't Hoff factor.
What is the van't Hoff factor?The van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass.
For non-electrolytes, such as C₆H₁₂O₆ and C₂H₅OH, i = 1. Comparing NaCl and CH₃COOH, we can determine that i(NaCl) > i(CH₃COOH) because NaCl is a strong electrolyte and CH₃COOH a weak one.Thus, NaCl, with the highest Van't Hoff factor, will have the lowest freezing point.
Among C₆H₁₂O₆, C₂H₅OH, CH₃COOH, and NaCl, NaCl is the one that will provide the aqueous solution with the lowest freezing point.
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Determine the molecular formula of a compound having the empirical formula C9H17O and a molar mass of 847.56g/mol.
Calculate the mass of water produced when 4.86 g of butane reacts with excess oxygen.
When 4.86g of butane reacts with excess oxygen, 7.53g of water is produced. This calculation is based on stoichiometry principles and the balanced chemical equation of the reaction.
Explanation:The subject of this question is Chemistry and it pertains to the reaction of butane (C4H10) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced chemical equation for this reaction is 2C4H10 + 13O2 -> 8CO2 + 10H2O. The mass of water produced can be calculated through stoichiometry, which is the method of calculating the quantitative/weight relations of reactants and products in a chemical reaction.
Given the weight of butane is 4.86g, we first need to convert this to moles. The molar mass of butane is calculated by adding the molar masses of Carbon (C=12.01g/mol) x 4 and Hydrogen (H=1.01g/mol) x 10. This equals approximately 58.12g/mol. Therefore, the number of moles of butane we have is 4.86g / 58.12g/mol = 0.0836 moles.
From the balanced equation, we can see that two moles of butane produce ten moles of water. Therefore, 0.0836 moles of butane would produce 0.0836 x 10/2 = 0.418 moles of water. To convert this to mass, we multiply by the molar mass of water, which is 18.01g/mol. Hence, 0.418 moles x 18.01g/mol = 7.53g of water.
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The reaction of 4.86 g of butane with excess oxygen produces approximately 7.53 g of water. This is determined using the molar mass of butane, the balanced chemical equation, and stoichiometry.
Explanation:The chemical reaction of butane (C₄H₁₀) with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O) is given by the balanced equation 2C₄H₁₀ + 13O₂ -> 8CO₂ + 10H₂O. In this reaction, 2 moles of butane produce 10 moles of water. The molar mass of butane is 58.12g/mole. Thus, 4.86 g of butane is 4.86 g / 58.12 g/mole = 0.0836 moles.
By stoichiometry, 0.0836 moles of butane would produce 0.0836 moles x (10 moles of water / 2 moles of butane) = 0.418 moles of water. As the molar mass of water is approximately 18.02 g/mole, the mass-produced would be 0.418 moles x 18.02 g/mole = 7.53 g. Thus, 4.86 g of butane reacts with excess oxygen to produce approximately 7.53 g of water.
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Select the incorrect statement.
The physical properties of a compound are similar to those of its elements.
The boiling point of a compound is different from the individual elements.
The melting point of a compound is different from the individual elements.
Density is a physical property.
Answer:
The incorrect statement is:
The physical properties of a compound are similar to those of its elements.
Explanation:
The physical properties of a compound depend on its elements but they are not similiar to the physical properties of individual elements.
Take water as an example. Water is made by oxygen and hydrogen (H₂O). At normal , water is liquid and both oxygen and hydrogen are gases.
Write the balanced nuclear equation for alpha decay of polonium−218. include both the mass numbers and the atomic numbers with each nuclear symbol. use the "sup-subscript" button in the answer palette to enter these numbers correctly. greek letters can be accessed in the drop-down menu that says "-select−."
How many carbon atoms will be in the longest chain 3,3,4,4-tetramethylhexane
This is for a study guide for my semester final, and I have no clue how to answer this, please help, and please at least try to help!
Besides the major types of radioactive decay, there are two others: positron emission and electron capture.
• Compare and contrast positrons with electrons.
• Explain how positron emission works and how it causes transmutations.
• Explain how electron capture works and how it causes transmutations.
• Compare the transmutations caused by positron emissions and electron capture.
Positron emission = emission of a positron and a neutrino when a proton is convert into a neutron. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron
It's a spontaneous reaction for some nucleus.
eg:
Positron = e+
Neutrino=ve
O-15 --> N-15 + e+ +ve
Electron capture= A nucleus absorb an electron while a proton is convert in a neutron and emit a neutrino. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron
eg:
Al-26 +e- --> Mg-26 + ve
Electron capture and positron emission are two mechanisms to explain the decay of some unstable isotopes. Electron capture is usually observed when the energy difference between the initial and final state is low. Mainly because of the larger amount of kinetic energy need for the expulsion two particles with the positron emission mechanism.
Is it possible to get the elliptic discriminate of an elliptic curve with characteristic 2?
What is the molarity of a solution that contains 3.25 moles of nano3 in 250. ml of solution?
The molarity of the solution is determined by dividing the number of moles of solute by the volume of the solution in liters, resulting in a molarity of 13.0 M for the sodium nitrate (NaNO3) solution.
Explanation:To calculate the molarity of the NaNO3 solution, we will use the formula of molarity, which is the number of moles of solute divided by the volume of the solution in liters. The student has provided that there are 3.25 moles of NaNO3 in 250 mL of solution.
To use the formula, we must convert the volume from milliliters to liters. Since 1000 mL equals 1 L, we divide the volume provided by 1000.
Volume in liters = Volume in mL / 1000 = 250 mL / 1000 = 0.250 L
Now, using the molarity formula:
Molarity (M) = Moles of solute / Volume of solution in liters = 3.25 moles / 0.250 L
M = 13.0 M
What term refers to group behavior seen in animals of a similar type?
Answer:
The correct answer is swarm behavior.
Explanation:
Swarming or swarm behavior is a collective behavior demonstrated by entities, mainly the animals of same size that accumulate together, specifically moving in masses or migrating in some direction or milling about the same spot. As a term, swarming is applicable mainly to insects, however, it can also be applied to any other animal or entity, which demonstrates swarm behavior.
In the chemical reaction: 2 h 2 (g) o2 (g) → 2 h2o (g), with 8 grams of h 2 (2 grams/mole) and 16 grams of o2 (32 grams/mole) and the reaction goes to completion, what is the excess reactant and how much of that would remain
Energy is released during which phase changes
Increasing ratios of oxygen-18 to oxygen-16 in glacial ice indicate ________.
a. advancing ice sheets
b. warming temperatures
c. increased volcanic emissions
d. uplift of land surfaces
An increased ratio of oxygen-18 to oxygen-16 in glacial ice indicates warming temperatures as oxygen-18 is a heavier isotope and precipitates less readily in cold conditions.
Explanation:The ratio of oxygen-18 to oxygen-16 in glacial ice is often used as an indicator of past climatic conditions. When this ratio is increasing, it typically indicates warming temperatures.
This is because oxygen-18 is a heavier isotope that precipitates less readily in cold conditions
Therefore, a higher ratio of oxygen-18 suggests that it was warm enough for more of this heavier isotope to precipitate. So, the correct answer is b. warming temperatures.
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What is the main difference between DNA and RNA? DNA contains ribose sugar, and RNA contains deoxyribose sugar instead. DNA contains cytosine, and RNA contains guanine instead. DNA contains deoxyribose sugar, and RNA contains ribose sugar instead. DNA contains adenine, and RNA contains guanine instead.
DNA contains ribose sugar, and RNA contains deoxyribose sugar instead. Therefore, the correct option is option A.
What are DNA and RNA?The complex molecular structures deoxyribonucleic acid (DNA) consequently ribonucleic acid (RNA) regulate all genetic traits of cells, and hence of species. DNA, which makes up the genetic material of all free-living species, is the ultimate life-plan. In addition to being the genetic makeup of some viruses, RNA employs DNA to code out the molecular makeup of proteins made in cells.
The two structures differ chemically in a number of ways. The "backbone" of DNA, or deoxyribose, is a sugar, like the acronym deoxyribonucleic acid suggests. The sugar ribose, which is slightly different, is present in ribonucleic acid (RNA). DNA contains ribose sugar, and RNA contains deoxyribose sugar instead.
Therefore, the correct option is option A.
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Match each type of energy with its description or example.
light
heat
chemical
mechanical
electrical
A.
the energy in your food is an example
B.
the kinetic energy of moving water is an example
C.
total kinetic energy of all the atoms that make up a sample of matter
D.
form of energy visible to the human eye
E.
caused by the movement of electrons
Answer:
A: Chemical
B: Mechanical
C: Heat
D: Light
E: Electrical
Explanation:
A: The energy in food is known as chemical energy. Chemical energy is the energy which is stored in the molecular bonds of the compounds (eg. glucose). Hence, when food is digested, many molecules are broken down to their most basic components.
B: Energy that can be used to "do work" is known as mechanical energy. Mechanical energy is energy (usually kinetic and potential energy) which is used to produce a force to an object, and in this conversion, the object then does work (eg. A body of water being used to push a turbine to create electricity).
C: The kinetic energy in atoms/molecules while vibrating is known as heat. Heat energy can be measured as the temperature of a certain substance, but it is actually the sum of all the kinetic energy of every single molecule/atom
D: The energy given off by the sun which allows us to view our surroundings is known as light energy. Light energy enters our eyes and is converted to an electrical impulse that our brain interprets as colour.
E: When electrons move from atom to atom, this is known as electrical energy. This energy is usually found as a property of metals, where they have a "sea" of localised electrons that can allow for the conduction of electricity