Answers
Answer:
To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
Explanation: Hope this helps :)
Related Questions
What is true of a Lewis base?
A. A Lewis base donates electron pairs.
B. A Lewis base donates H* ions.
C. A Lewis base donates a salt in solution.
D. A Lewis base donates OH ions.
Answers
The statement that is true of a Lewis base is that a Lewis base donates electron pairs (option A).
What is a Lewis base and acid?A Lewis base is any nucleophylic compound that can donate a pair of electrons and form a coordinate covalent bond.
On the other hand, a Lewis acid is any electrophylic compound that can accept a pair of electrons and form a coordinate covalent bond.
This means that a Lewis base can donate a pair of electrons to a Lewis acid to form a product containing a coordinate covalent bond. This product is also referred to as a Lewis adduct.
Therefore, option A is correct about Lewis base
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What is the ΔG (kJ/mol) for a reaction at 25 Celsius that is:
Mg3(PO4)2 (s) ⇄ 3 Mg2+ (aq) + 2 PO43− (aq) ΔG0 = 137.0 kJ/mol
If there is initially 0.65 M Mg2+(aq) and 0.43 M PO43− (aq) in solution?
Answers
Answer:
115.6 kJ/mol
Explanation:
The ΔG of a reaction can be calculated using the following equation:
ΔG = ΔG° + RT ln(Q)
where:
ΔG° is the standard free energy change, which is given as 137.0 kJ/mol in this case
R is the gas constant, which is 8.314 J/(mol·K)
T is the temperature in Kelvin, which is 25°C + 273.15 = 298.15 K
Q is the reaction quotient, which is the ratio of the concentrations of the products to the concentrations of the reactants, each raised to their stoichiometric coefficients.
From the chemical equation given, the stoichiometric coefficients of Mg2+ and PO43- are 3 and 2 respectively. Therefore, the reaction quotient can be expressed as:
Q = [Mg2+]^3 [PO43-]^2
Substituting the given initial concentrations of Mg2+ and PO43- into the reaction quotient expression, we get:
Q = (0.65 M)^3 (0.43 M)^2 = 0.011 M^5
Now we can calculate the ΔG of the reaction:
ΔG = ΔG° + RT ln(Q)
ΔG = (137.0 kJ/mol) + (8.314 J/(mol·K) × 298.15 K) × ln(0.011 M^5)
ΔG = 137.0 kJ/mol - 21.38 kJ/mol
ΔG = 115.6 kJ/mol
Therefore, the ΔG for the reaction at 25°C and the given initial concentrations of Mg2+ and PO43- is 115.6 kJ/mol.
module 9 lesson 4: colligative properties slide 2: colligative properties when you add a to a , the properties of the resulting are different than those of the pure . these different properties are called . definition: colligative properties do not depend on , but they do depend on the . 3 colligative properties are: slide 3: number of solute particles ionic compounds break into their when they in solution, whereas compounds stay together as molecules. what is the number of particles a solute breaks into known as? what is the symbol? the the number of particles in the the greater the difference will be for the of the solution compared to the solvent. slides 4
Answers
The number of particles a solute breaks into is known as the van't Hoff factor (i) and is represented by the symbol i.
Colligative properties are properties of a solution that depend on the concentration of solute particles, but not on the nature of the solute. Three colligative properties are:
1. Lowering of freezing point: when a solute is added to a solvent, the freezing point of the resulting solution is lower than that of the pure solvent.
2. Elevation of boiling point: when a solute is added to a solvent, the boiling point of the resulting solution is higher than that of the pure solvent.
3. Osmotic pressure: solutions have an osmotic pressure, which is the pressure required to prevent the flow of solvent into the solution through a semipermeable membrane.
When an ionic compound dissolves in a solvent, it breaks into its individual ions, whereas non-ionic compounds stay together as molecules. The number of particles a solute breaks into is known as the van't Hoff factor (i) and is represented by the symbol i. The greater the van't Hoff factor, the greater the difference will be for the colligative properties of the solution compared to the solvent.
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A symbiotic relationship in which both organisms benefit
A. parasitism
B. mutualism
C. commensalism
Answers
Parasitism is when one is benefiting while the other is being harmed; commensalism is when one is benefiting and the other isn’t affected; and mutualism is basically in its name, they’re both mutually benefiting.
Answer: B
Mutualism.
Explanation:
Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?
Answers
Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.
As a result, the ice undergoes a phase change, from a solid to a liquid. This process is called melting. During melting, the temperature of the ice remains constant at 0°C because all the heat energy is used up in overcoming the intermolecular forces of attraction.The energy required to melt ice is known as the heat of fusion. The heat of fusion is the amount of heat energy required to change 1 kilogram of a solid into a liquid at its melting point. For water, the heat of fusion is 334 kJ/kg. This means that 334 kJ of heat energy is required to melt 1 kg of ice at 0°C. Therefore, during the melting of ice, the temperature of the ice does not change, but the internal energy of the ice does change, and this is manifested in the change of phase from a solid to a liquid.In summary, when heat is added to ice at 0°C, the temperature of the ice does not change, and all the heat energy is used up in overcoming the intermolecular forces of attraction between the water molecules in ice. This results in the melting of ice without any change in temperature.For such more question on molecules
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in a land ecosytem , some organisms only live in the soil under rocks logs or plants . What would be a resonable prediction about how theses organisms would be affected if humans removed the coverings .
Answers
Answer:
The number of these organisms in the soil would decrease.
Explanation:
A 50.0 mL sample of 12.0 M HCl is diluted to 200 mL. What is true about the diluted solution?
Answers
The concentration of the solution reduces and the number of moles of solute isn't affected.
Data;
V1 = 50mLC1 = 12.0MV2 = 200mLC2 = ?Facts about the diluted solution1. When the solution is diluted, the concentration changes and this time, the concentration reduces.
Using dilution formula
\(c_1 v_1 = c_2 v_2\\12 * 50 = c_2 * 200\\c_2 = \frac{600}{200} \\c_2 = 3M\)
The concentration of the solution reduces.
2. The number of moles remains the same.
When a solution is diluted, the number of moles remains the same because there's no change in the mass of the solute.
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what variables effect whether or not the fishing weight floats
Answers
Answer:The fishing way and how fast is going
Explanation:Because of the variables the fishing we will flow much more faster
A chemical reaction occurs when we see a chemical?
Answers
Answer:
A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.
Write and balance the equation for the dissolving of aluminium chloride into an aqueous solution with the dissociation of
the ions.
This is a dissolution reaction. Where ionic compounds are dissolving, the ions dissociate.
AICI(S) → A13+ (aq) + Cl(aq)
3 AICI(s) + 3 Alt(aq) + 3 Cl(aq)
O AlCl3(s) → A13+ (aq) + 3 Cl(aq)
O AlCl3(s) → Al2+ (aq) + 2Cl(aq)
O AL C13(s) → 2 Alf+ (aq) + 3 Cl(aq)
Answers
The balanced equation for the dissolving of aluminum chloride into an aqueous solution with the dissociation of the ions is; AlCl3(s) → Al^3+ (aq) + 3 Cl^-(aq).
What is an equation?An equation is a representation of the change that occurs inside a reaction vessel. Usually, we use this tool to show on paper, a process that we can not see with or eyes.
The equation that shows the balanced equation for the dissolving of aluminum chloride into an aqueous solution with the dissociation of the ions is; AlCl3(s) → Al^3+ (aq) + 3 Cl^-(aq).
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ANSWER FAST How many moles are there in 4.31 × 1012 molecules of sucrose C12H22O11?
(1 mole = 6.022 × 1023 molecules).
Answers
Answer:
Щоб обчислити кількість молей у 4,31 x 10^12 молекулах сахарози C12H22O11, ми можемо використати число Авогадро таким чином:
Кількість молей = кількість молекул / число Авогадро
Кількість молей = 4,31 x 10^12 / 6,022 x 10^23
Кількість молей = 7,17 x 10^-12 молей
Отже, 7,17 x 10^-12 моль сахарози C12H22O11 міститься в 4,31 x 10^12 молекул.
Explanation:
The diagram represents an atom of sodium combined chemically with one atom of chlorine to form a sodium chloride molecule. Sodium Chloride is an example of
Answers
Answer:
It is an example of ionic compound and ionic salt
Which of the following ions has the largest radius? Br- S2- B3+ Mg2+ Li+
Answers
Answer:
Br - has the largest radius
Explanation:
These ions each have achieved the nearest noble gas configuration. Br - has a like electron configuration to that of Krypton, S2- has a like electron configuration to that of Argon, B3+ to Helium, Mg2+ to Neon, and Li+ to Helium.
_______________________________________________________
Traveling down a group, the radius tends to increase as atom gains another shell. Here we are comparing elements of like electron configuration to the noble gases Helium, Neon, Argon, Krypton. Krypton, being the last element present in the group out of the 4, has the greatest radius as it has the most shells. Thus, Br - has the largest radius.
Hope that helps!
why are phase changes horizontal on a heating curve
Answers
Answer:
A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes.The second change of phase is boiling, as the temperature stays the same during the transition to gas.
Explanation:
The complex ion Cu(NH3)42+ is formed in a solution made of 0.0200 M Cu(NO3)2 and 0.300 M NH3. What are the concentrations of Cu2+, NH3, and Cu(NH3)42+ at equilibrium? The formation constant*, Kf, of Cu(NH3)42+ is 1.70 × 1013.
Answers
The concentrations Cu(NH3)42+ at equilibrium is [Cu(NH3)42+] = 1.70 × 1013 * (0.0200M) * (0.300M)^4.
The concentrations of Cu2+ is [Cu(NH3)42+] + [Cu2+]
The concentrations of NH3 is 4[Cu(NH3)42+] + 4[NH3]
What is concentration equilibrium?Equilibrium concentration is described as a state when the rate of forward reaction in a chemical reaction becomes equal to the rate of backward reaction.
The equilibrium constant expression for the formation of the complex ion Cu(NH3)42+ is:
Kf = [Cu(NH3)42+] / [Cu2+] * [NH3]^4
where [Cu(NH3)42+], [Cu2+], and [NH3] are the molar concentrations at equilibrium.
The initial concentrations of Cu2+ and NH3 are 0.0200 M and 0.300 M respectively.
We have that Kf = 1.70 × 1013, we then rearrange the equation to solve for [Cu(NH3)42+]:
1.70 × 1013 = [Cu(NH3)42+] / (0.0200M) * (0.300M)^4
[Cu(NH3)42+] = 1.70 × 1013 * (0.0200M) * (0.300M)^4
Therefore at equilibrium, the concentration of Cu(NH3)42+ is [Cu(NH3)42+] = 1.70 × 1013 * (0.0200M) * (0.300M)^4
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Calculate the mass in grams of a 1.070 mole of acetylene ,C2H2
Answers
Answer:
27.86x10^-3 Kg
Explanation:
Hi! To get the result you only need to use this formula: m = n x M <=> m = 1.070 x ((2x12.01 + 2x1.01) x 10^-3) = 27.8628 x 10^-3 Kg. Hope it helped!
Molar mass= 26.04 g/mol
mass=?
m=nM = (1.070 mole)(26.04g/mol) =27.8628 g
Which best explains how heat plays a role in the movement of materials within Earth's interior?
Answers
Answer:
Hot material near the core is less dense and rises, when it cools, it becomes more dense and sinks.
Explanation:
This best explains how heat plays a role in the movement of materials within Earth's interior because it's how convection works. Convection is the circular motion that happens when warmer air or liquid which has faster moving molecules, making it less dense rises, while the cooler air or liquid drops down. Convection currents within the earth move layers of magma, and convection in the ocean creates currents.
Earth’s interior is like a closed chamber, hot material near Earth's surface is more denser and sinks, and when it cools, it becomes less dense and Rises.
What is Convection?Convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids. The heat transfer take place from solid to no solid material. like air and water.
As we take example of home. In home heat take nearer the roof and cold air will be nearer to the flour. It is because of hot is less denser then the cold air. Hot air will become less denser and move towords upside. Cold air become denser move towards down.
Similarly, on earth. Nearer to earth hot materials are more dense and sinks. When it cools, it become less dense and rises.
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Which solids are insoluble in water.
Answers
Some types of solids that are insoluble in water are:
Metals. (most of them)Non-Metallic ElementsMetal OxidesSome Non-Metallic ElementsMetal Carbonates (most of them)Metal Sulfides (most of them)Salts (some of them)Which solids are insoluble in water?Many solids are insoluble in water, meaning they do not dissolve in water to a significant extent. Here are some examples of common solids that are generally insoluble in water:
Metals: Most metals, such as gold, silver, platinum, and copper, are insoluble in water.
Non-Metallic Elements: Many non-metallic elements, such as carbon (in the form of graphite or diamond), sulfur, phosphorus, and iodine, are insoluble in water.
Metal Oxides: Some metal oxides, particularly those of less reactive metals, are insoluble in water. Examples include aluminum oxide (Al2O3), iron(III) oxide (Fe2O3), and lead(II) oxide (PbO).
Metal Carbonates: Most metal carbonates are insoluble in water. Examples include calcium carbonate (CaCO3), lead(II) carbonate (PbCO3), and copper(II) carbonate (CuCO3).
Metal Sulfides: Many metal sulfides are insoluble in water. Examples include lead(II) sulfide (PbS), silver sulfide (Ag2S), and mercury(II) sulfide (HgS).
Insoluble Salts: Certain salts have limited solubility in water. Examples include silver chloride (AgCl), lead(II) iodide (PbI2), and calcium sulfate (CaSO4).
It's important to note that while these solids are generally insoluble in water, they may exhibit some solubility to a small extent. The solubility of a solid in water can vary depending on factors such as temperature, pressure, and the presence of other solutes.
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Determine the number of atoms of O in 7.23 moles of Ca(NO3)2.
Answers
Answer: 43.38 number of atoms
Explanation: If you look at this formula, then this one molecule contains six oxygen atoms. That means number of moles of oxygen atoms. That is six times the number of moles and of calcium nitrate, That is six, multiply 7.23, which comes out to be 43.38 moles of oxygen atom.
which of the following is a cycloalkane?
Answers
Answer:
a
Explanation:
Answer:
cyclopentane cyclobutene cyclohexane cycloheptane
Sharla finds a container labeled tungsten. She removes the metal and weighs it and determines the mass is 377.64 grams of tungsten. How many moles of
TuneSten did she one?
Answers
Sharla finds a container labeled tungsten and Sharla found 2.05 moles of tungsten in the container.
What is moles of a substance?Mole is the amount of substance of a system that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12 and its symbol is “mol”. One mole of substance is equal to the value of 6.023 x 10^23 (Avogadro's number). It can be used to measure the products obtained from chemical reaction.
As, number of moles is mass / molar mass
so, molar mass of tungsten is 183.84 g/mol.
the number of moles of tungsten that Sharla found would be:
number of moles = 377.64 g / 183.84 g/mol = 2.05 mol
Therefore, Sharla found 2.05 moles of tungsten in the container.
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Sputnik is the Russian name for __________.
Answers
What happens in a reaction if it is at chemical equilibrium?
Responses
The reaction rates of making products and using reactants are equal.
All of the reactants are used up.
The amount of the product is constantly decreasing.
There are no products in the system.
Answers
The reaction can be said to be at equilibrium when the reaction rates of making products and using reactants are equal.
When is a reaction at equilibrium?When the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products don't change over time, a chemical reaction is said to be in equilibrium.
When the system reaches equilibrium, it is in a state of balance, which means that the concentrations of the reactants and products have not changed significantly.
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For this one do we multiple the molar mass to 4.25
Answers
Answer:
\(0.152\text{ moles CO}\)Explanation:
Here, we want to get the number of moles in 4.25 g of CO
To get the number of moles, we have to divide the mass by the molar mass of CO
Mathematically:
\(Number\text{ of moles = }\frac{mass}{molar\text{ mass}}\)The molar mass of CO is the sum of the atomic masses of carbon and oxygen
The atomic mass of carbon is 12 amu
The atomic mass of oxygen is 16 amu
The molar mass is thus:
\(12\text{ + 16 = 28 g/mol}\)Thus, we have the number of moles as:
\(\frac{4.25}{28}\text{ = 0.152 moles CO}\)Complete and balance the following half-reaction in acidic solution. Be sure to include the proper phases for all species within the reaction. NH3(g) → NO3- (aq)
Answers
NH3 (8) + 3H20 (1) NO₂ (aq) + 9H+ (aq) + 8e- is the balance of half-reaction in acidic solution .
The NH3 oxidation number is -3. The oxidation number of nitrogen in NO2 is +5. So, this is now available. As a result of the oxidation process, electrons will be released. In an acidic medium, each оудeт excess atom is balanced by adding the same number of water molecules on the side with fewer oxygen atoms and doubling the number of H+ ions on the other side. As a result, the balanced equation is: NH3 (8) + 3H20 (1) NO2 (aq) + 9H+ (aq) + 8e-. half-reaction is a portion of a larger reaction that represents either an oxidative stress or a reduction. To fully describe a redox, half, one oxidation and one decrease, are needed. In general, the half-reactions first were balanced individually by atomic nuclei. The quarter contain electrons. The amount of electrons lost is then balanced to balance the electron density gained. Finally, the half are combined. The concentration of hydrogen ions (H +start subscripts, plus, end superscript) in an acidic solution seems to be greater than that of pure water. A basic solution has a lower H +start superscript as well as end superscript density than pure water.
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Consider an electrochemical cell formed from a Cu(s) electrode submerged in an aqueous Cu(NO_3)_2 solution and a Cd(s) electrode submerged in a Cd(NO_3)_2(aq) solution. The two electrodes are connected by a wire and the two solutions are connected by a salt bridge containing NaNO_3(aq). The following reaction takes place: Cu^2+(aq) + Cd(s) rightarrow Cu(s) + Cd^2+(aq) Which statement describes how the electrons or nitrate ions will flow? electrons will flow from Cu(s) to Cd(s) nitrate ions will flow from Cu compartment to Cd compartment nitrate ions will not flow between compartments nitrate ions will flow from Cd compartment to Cd compartment
Answers
Option B is the right answer, Nitrate ions will flow from Cu compartment to Cd compartment.
Define electrochemical cell.
An electrochemical cell is a device that uses electricity to induce a nonspontaneous process or to generate electricity from a spontaneous oxidation-reduction reaction.
Since in the given reaction Cu2+ is going to reduce to Cu and Cd is going to oxidize to Zn2+ . Electrons and cadmium ions will move towards cathode where reduction occurs.
And nitrate ions will move towards anode to maintain a neutral charge, where oxidation occurs.
So, nitrate will flow from Cu compartment to Cd compartment.
Therefore, option B is the right answer, Nitrate ions will flow from Cu compartment to Cd compartment.
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(e) What type of reaction takes place when zinc reacts with copper oxide? Tick one box. Combustion
Crystallisation
Displacement
Neutralisation oxide
Answers
To solve such this we must know the concept of displacement reaction. Therefore, the correct option is option C that is displacement reaction.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
when zinc reacts with copper oxide then zinc displace copper from copper oxide as zinc is more reactive than copper on the reactivity series. So, copper is displaced by zinc.
Therefore, the correct option is option C that is displacement reaction.
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what is the reaction?
Answers
Answer:
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. ... A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Explanation:
Hopefully this is what you needed
4. What is the percent yield of a reaction that produces 12.5 g CF2Cl2 from 32.9 g of CCl4 and excess HF
Answers
Answer:
Percent yield = 48.3%
Explanation:
The reaction is:
CCl₄ + 2HF → CF₂Cl₂ + 2HCl
1 mol of CCl₄ reacts with 2 moles of hydrofluoric acid in order to produce 1 mol of CF₂Cl₂ and 2 moles of hydrogen chloride.
HF is in excess, so the limiting reagent is the CCl₄.
We convert mass to moles:
32.9 g . 1mol / 153.8g = 0.214 moles
Ratio is 1:1. In conclussion: 0.0813 moles of CCl₄ can produce 0.0813 moles of CF₂Cl₂. We convert moles to mass, to determine the theoretical yield:
0.214 mol . 120.91g /mol = 25.8 g
Percent yield = (Yield produced /Theoretical yield) . 100
Percent yield = (12.5 g/ 25.8g) . 100 = 48.3%
Does the phrase “you are what you eat” make scientific sense according to your knowledge of enzymes and transport?
Answers
The phrase “you are what you eat” does not make scientific sense according to the knowledge of enzymes and transport because foods are broken down by enzymes into small subunits which are common to all biomolecules.
What is the role of enzymes in the digestive system?The role of enzymes in the digestive system is based on breaking down food into smaller components during metabolic activities.
Therefore, with this data, we can see that the role of enzymes in the digestive system is to degrade biomolecules that are ingested into common subunits.
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