The correct statement is " The element is more readily reduced than hydrogen." A hydrogen electrode is always attached to the rod of the element being investigated to obtain the electrode potential. It is called a standard hydrogen electrode, because the conditions are standard with pressure at 1 atm and the concentration of [tex]H^+[/tex] ions at 1M. A positive standard reduction potential means the element's electrode forms its metal ions less readily than hydrogen, which leads to the electrode being reduced by gaining electrons and the potential difference giving a positive value.
#1: Which type of substance is an electron-pair donor?
A. Arrhenius acid
B. Brønsted-Lowry base
C. Brønsted-Lowry acid
D. Lewis base
***I'm not sure on this one.. :( what do you think? @aaronq :)
An element is made up of _____.
One mole of copper(ii) sulfate, cuso4, contains ________ o atoms.
One mole of copper(II) sulfate, CuSO4, contains 6.022 x 10^23 atoms.
Explanation:One mole of copper(II) sulfate, CuSO4, contains 6.022 x 1023 atoms. This can be determined using Avogadro's number, which states that one mole of any substance contains 6.022 x 1023 atoms or molecules. Therefore, in one mole of copper(II) sulfate, there would be 6.022 x 1023 copper atoms, 6.022 x 1023 sulfur atoms, and 24.088 x 1023 oxygen atoms.
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One mole of copper(II) sulfate contains four moles of oxygen atoms. Using Avogadro's number, it translates to approximately 2.4088 x 10^24 oxygen atoms.
Explanation:The question asks for the number of oxygen atoms present in one mole of copper(II) sulfate (CuSO4). Copper sulfate contains one copper atom (Cu), one sulfur atom (S), and four oxygen atoms (O). Hence, one mole of copper(II) sulfate would contain four moles of oxygen atoms.
Using Avogadro's number, which states there are 6.022 x 10^23 entities (such as atoms) in one mole, we can say that one mole of copper(II) sulfate contains 4 times 6.022 x 10^23 oxygen atoms, which is approximately 2.4088 x 10^24 oxygen atoms.
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PLEASE HELP!!!!!!!!!!!!!
Which ideas did you include in your answer? Check all that apply.
A is the activation energy.
B is the activated complex.
C is the enthalpy of reaction.
D is the energy of the products.
E is the energy of the reactants.
F is the reactants, Q + R.
G is the products, N + M.
The reaction is exothermic, because the energy of the reactants is greater than the energy of the products.
In an exothermic reaction, the energy of the reactants is higher than that of the products, signifying that energy is released. The activation energy is the difference between the energy of the reactants and the activated complex, and the enthalpy of reaction is the heat content change indicating if the reaction is exothermic or endothermic.
Explanation:To determine whether a reaction is exothermic or endothermic, we can analyze the enthalpy change (ΔH). If ΔH is less than zero (ΔH < 0), this indicates that the reaction is exothermic. In an exothermic reaction, the energy of the reactants is higher than that of the products, and energy is released in the form of heat or light.
To calculate the activation energy (A), which is the minimum energy required to start a reaction, we consider the energy difference between the reactants (E) and the activated complex (B), also known as the transition state.
The enthalpy of reaction (C) represents the heat content change from reactants to products. In cases where the products (G) have lower energy than the reactants (F), the reaction is indeed exothermic. Therefore, in your answer, you should include ideas that reflect the concepts of activation energy, activated complex, enthalpy of reaction, energy of the reactants, and energy of the products to explain why the reaction is exothermic.
Net ionic equations for potassium sulfate plus calcium phosphate yields
which statement accurately describes the origin and expansion of the universe
Answer:
Cosmic background radiation is leftover thermal energy from the big bang.
Explanation:
If 4.0 g of O2(g) and 4.0 g of He(g) are placed in a 5.0-L vessel at 65 °C, what will be the partial pressure of each gas and the total pressure in the vessel?,
The partial pressure of O₂ is 0.693 atm, the partial pressure of He is 5.55 atm, and the total pressure in the vessel is 6.24 atm.
The partial pressure of each gas and the total pressure in the vessel, we can use the ideal gas law, PV = nRT. We'll start by calculating the number of moles of each gas.
First, calculate moles of O₂ (molar mass = 32 g/mol): n(O2) = 4.0 g / 32 g/mol = 0.125 molesNext, calculate moles of He (molar mass = 4 g/mol): n(He) = 4.0 g / 4 g/mol = 1.0 molesNow use the ideal gas law to find the partial pressures. The universal gas constant (R) is 0.0821 L·atm/(mol·K) and the temperature (T) is 65 °C, which is 338 K.
Partial pressure of O₂: P(O₂) = (nRT) / V = (0.125 mol * 0.0821 L·atm/(mol·K) * 338 K) / 5.0 L = 0.693 atmPartial pressure of He: P(He) = (1.0 mol * 0.0821 L·atm/(mol·K) * 338 K) / 5.0 L = 5.55 atmTotal pressure is the sum of the partial pressures:Total Pressure = P(O₂) + P(He) = 0.693 atm + 5.55 atm = 6.24 atm
19. Some redox reactions are also classified as which of the following?
(Points : 3)
acid-base
synthesis
single-displacement
decomposition
Question 20. 20. If ions change places and a gas is formed, then what type of reaction is indicated?
(Points : 3)
double-displacement
synthesis
decomposition
single-displacement
19.) Single-displacement is the correct answer.
20.) I am not sure, but Single-displacement is incorrect. At least you can cancel that one out.
The solute that is found in the greatest amount in ocean water is______.
The solute that is found in the greatest amount in ocean water is salt.
MARINE WATER:Marine water body refers to water bodies that contain a great amount of salt. Examples are oceans, seas etc. On the other hand, freshwater contains very little or no amount of salt. They include rivers, lakes, ponds etc. Since ocean water is an example of marine water body, thus, it contains a great amount of salt as a solute.Learn more about oceans at: https://brainly.com/question/11803537
Summarize the difference between legal law and scientific law
Answer:
Legal laws are passed by lawmakers in a democratic process that accounts for people's opinions and beliefs.
Scientific laws are discovered and tested by experiments.
Legal laws can be changed if people change their minds.
Legal laws may have exceptions.
on edg
Explanation:
What is the concentration of the base (NaOH) in the following titration?
A) 3.0 M
B) 142.2 M
C) 3.79 M
D) 3.86 M
Answer: D: 3.86
Explanation:
Can someone help me with chemistry?
Write the complete balanced equation for the reaction that occurs when aluminum phosphate (AlPO4) reacts with magnesium chloride (MgCl2) in an aqueous solution.
I got
2AlPO4 (aq) + 3MgCl2 (aq) -> Mg3(PO4)2 (s) + 2AlCl3 (aq)
Is this right?
2AlPO4 ( aq) + 3MgCl2 (aq) -> Mg3(PO4)2 (s) + 2AlCl3 (aq)
Right answer is D
Answer : Yes, the given reaction is the complete balanced equation.
Explanation :
Balanced equation : It is defined as the number of individual atoms of an element present on the reactant side always be equal to the number of individual atoms of an element present on product side. That means the complete balanced equation are those which follows the law of conservation of mass.
When aluminum phosphate reacts with magnesium chloride in an aqueous solution then it gives magnesium phosphate and aluminium chloride as a product.
The complete balanced equation will be,
[tex]2AlPO_4(aq)+3MgCl_2(aq)\rightarrow Mg_3(PO_4)_2(s)+2AlCl_3(aq)[/tex]
By the stoichiometry, 2 moles of aluminium phosphate react with 3 moles of magnesium chloride to give 1 mole of magnesium phosphate and 2 moles of aluminium chloride.
What is the relationship among cells, chromosomes, genes, and DNA?
A. DNA is a double helix structure found in the nucleus. Chromosomes straighten out the DNA so the code can be read by genes.
B. Cells contain chromosomes which are made up of genes. Genes are made up of tightly wound strands of DNA.
C. Chromosomes are tightly wound strands of DNA located in cells. Genes are sections of DNA.
D. Tightly wound strands of chromosomes contain genes and are found in cells. The genes we coded sequences nucleotide read by DNA.
A reaction goes essentially to completion. Would you expect the value of K to be large or small?
Which of these has the greatest compressibility?
gas
liquid
solid
They are all equal.
What is the volume of 120 mg of water?
A. 1.2 dL
B. 120 mL
C. 120 L
D. 1.2 L
for which compound does 0.256 mole weigh 12.8 g?
A) \(C_2 H_4 O\)
B) \(CO_2\)
C) \(CH_3 Cl\) <--answer
D) \(C_2 H_6\)
E) None of these
can someone tell me why C is the right answer and not E?,
A chemical reaction that absorbs energy in the form of heat is considered _____.
this seems like a complicated one. can someone help me with this question?
If the pH of a 1.00-in. rainfall over 1400miles2 is 3.60, how many kilograms of sulfuric acid, H2SO4, are present, assuming that it is the only acid contributing to the pH?
For sulfuric acid, Ka1 is very large and Ka2 is 0.012.
Which state of matter has a constant volume, but changes shape?\?
1.) the attraction between two _____ forms an ionic bond.
A) atoms of the same change
B) cations
C) atoms of the opposite charge
D) metals
2.) what is an ion with a positive charge called?
A) anion
B) cation
C) valence electron
D) covalent ion
1. Ionic form is formed when one or more electrons from the valence shell of an atom (electropositive metal ) are completely transferred to the valence shell of another atom (electronegative non-metal). Ionic bonding is the complete transfer of valence electron(s) between oppositely charged atoms.
For example NaCl (sodium chloride ) is an ionic bond, in which valence electron from Na gets completely transferred to the valence shell of Cl and ionic bond is formed between opposite ions that is Na (positive) and Cl (negative).
[tex] Na^{+}(cation) + Cl^{-}(anion)\rightarrow Ionic bond [/tex]
So option 'C' is correct choice.
2. A neutral atom can lose or gain an electron.
If the neutral atom loses an electron it will become ion with positive charge known as 'Cation'
If the neutral atom gains an electron it will become ion with negative charge known as 'Anion'
So an ion which positive charge is called 'Cation' , option B is correct.
An attraction between two atoms of the opposite charge forms an ionic bond. An ion with a positive charge is known as a cation.
Explanation:The attraction between two atoms of the opposite charge forms an ionic bond. The negatively charged atom (anion) and positively charged atom (cation) experience a strong electrostatic attraction that constitutes an ionic bond. This typically occurs between a metal and nonmetal atom.
An ion with a positive charge is called a cation. Cations are usually metals. For example, when neutral sodium loses one electron, it becomes a positively charged sodium cation (Na+).
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What exactly is a reservoir?
A reservoir is a body of water. Towns and municipalities use it to capture water and it then seeps through the ground which cleans it and then it gets filtered into this processing thing and it then gets shipped out in pipes to peoples houses. A reservoir is a broad term though. You can have a reservoir of a variety of things such as a reservoir of oil kind of like a surplus where you can store it but in most cases, people talk about water.
Water is a compound that is made out of two hydrogen atoms and one oxygen atom. Which statement about water is true?
A.
Water is usually a gas like the elements oxygen and hydrogen.
B.
Water has a set of properties that are different from oxygen and hydrogen.
C.
Water has properties that are a blend of the properties of oxygen and hydrogen.
D.
Water is flammable like the elements oxygen and hydrogen.
Answer is: B. Water has a set of properties that are different from oxygen and hydrogen.
For example, boiling point of water is 100°C and oxygen has boiling point of -183°C and hydrogen has boiling point of -253°C.
Another example, at room temperature water is liquid, oxygen and hydrogen are gases.
Water is not flammable, hydrogen anf oxygen are flammable.
Water has polar covalent bonds, oxygen anf hydrogen have nonpolar bonds between atoms.
Answer:
B.
Water has a set of properties that are different from oxygen and hydrogen.
Explanation:
The characteristic properties of these elements are different from those of water. However, hydrogen and oxygen have some common properties. They are both colorless, odorless gases , and they both readily react with other elements—making them "reactive" elements. ... Hydrogen has the lowest density of all the elements. Yee.
Your boss tells you that she needs a decision by the end of the day about the machine you want to purchase for your new operation. You have four options, and your boss reminds you to be as cost-efficient as possible but that she also wants the best efficiency. Which is your best option?
Option 1: This $5,000 machine is supplied energy at a rate of 1,900 W and does useful work at a rate of 1,786 W.
Option 2: This $4,500 machine is supplied energy at a rate of 1,450 W and does useful work at a rate of 1,300 W.
Option 3: This $4,750 machine is supplied energy at a rate of 1950 W and does useful work at a rate of 1833 W.
Option 4: This $4,750 machine is supplied energy at a rate of 2,000 W and does useful work at a rate of 1,822 W.
A. Option 1 B. Option 2
C. Option 3 D. Option 4
Answer:
Option (I) has the lowest energy rate so that would be best option.
Explanation:
(I). Given that,
Input energy = 1900 W
Output energy = 1786 W
We calculate the loss of energy
Using formula of loss of energy
[tex]E_{loss}= E_{in} - E_{out}[/tex]
Put the value into the formula
[tex]E_{loss}=1900-1786= 114\ W[/tex]
(II). Given that,
Input energy = 1450 W
Output energy = 1300 W
We calculate the loss of energy
[tex]E_{loss}=1450-1300= 150\ W[/tex]
(III). Given that,
Input energy = 1950 W
Output energy = 1833 W
We calculate the loss of energy
[tex]E_{loss}=1950-1833= 117\ W[/tex]
(IV). Given that,
Input energy = 2000 W
Output energy = 1822 W
We calculate the loss of energy
[tex]E_{loss}=2000-1822= 178\ W[/tex]
Hence, Option (I) has the lowest energy rate so that would be best option.
2. If a liquid is sealed in a container and kept at constant temperature, how does its vapor pressure change over time? (1 point)
It continues to steadily increase.
It increases at first, then remains constant.
It increases at first, then decreases.
It continues to steadily decrease.,
The answer to your question
B
I hope the answer to your question
Balance the following equation in acidic conditions. Phases are optional. Cu NO3,
The final balanced equation is 3Cu(s) + 2HNO₃(aq) + 6H⁺(aq) → 3Cu²⁺(aq) + 2NO(g) + 4H₂O(l).
To balance the redox reaction of copper with nitric acid in acidic conditions, we need to write separate half-reactions for oxidation and reduction, balance them for mass and charge, and then combine them into a balanced overall equation. The oxidation half-reaction involves copper turning into copper(II) ions:
oxidation:
Cu(s) → Cu²⁺ (aq) + 2e⁻
For the reduction half-reaction, nitric acid is reduced to nitrogen monoxide:
reduction:
HNO₃(aq) + 3e⁻ → NO(g) + H₂O(l)
Now we multiply each half-reaction by a number that will balance the electrons lost in oxidation with the electrons gained in reduction. For this equation, we multiply the oxidation half-reaction by 3 and the reduction half-reaction by 2:
3Cu(s) - 3Cu²⁺ (aq) + 6e⁻
2HNO₃(aq) + 6e⁻ - 2NO(g) + 2H₂O(l)
Now we combine the half-reactions and add 6H⁺ to balance the hydrogen:
3Cu(s) + 2HNO₃(aq) + 6H⁺ (aq)
ightarrow 3Cu²⁺ (aq) + 2NO(g) + 4H₂O(l)
This equation represents the balanced redox reaction in acidic solution between solid copper and nitric acid to produce aqueous copper(II) ions and nitrogen monoxide gas.
The complete question is:
Balance the following equation in acidic conditions. Phases are optional.
Cu+NO3- = Cu2+ NO
(redox and Oxidation reactions)
Calculate the ph of a mixture that contains 0.18 m of hno3 and 0.24 m of hbro
The pH of the mixture solution is 0.745
The concentration of [tex]HNO_3[/tex] = 0.18 m
The concentration of [tex]HBrO[/tex] = 0.24 m
It is required to calculate the pH of the mixture solution.
What is pH?pH, a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
We know that [tex]HNO_3[/tex] is a strong acid while HBrO is weak acid.
Therefore we ignore the presence of the weak acid such that we consider the pH of the strong acid.
since
pH= - log (H⁺)
Hence pH= -log (0.18)
pH = 0.745
Therefore, the pH of the mixture solution is 0.745
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All substances are composed of which type of matter?
a. ions
b. mixtures
c. elements
d. molecules
Determine the ph at the equivalence (stoichiometric) point in the titration of 32 ml
A typical phase change diagram is shown below. Which of the numbered arrows represent changes where the kinetic energy of the particles increases
In a phase change diagram, the arrows representing an increase in kinetic energy of particles are those showing endothermic transitions: melting, vaporization, and sublimation, which are marked by purple arrows.
Explanation:Phase changes involve a change in kinetic energy of particles. When particles transition from solid to liquid, liquid to gas, or solid to gas, their kinetic energy increases. These changes are represented by the purple arrows in the diagram.
In a phase change diagram, the arrows that represent changes where the kinetic energy of the particles increases are those that indicate heating: from solid to liquid, liquid to gas, and solid to gas. These transitions are endothermic, meaning they require an input of energy from the surroundings. When a substance changes from a solid to a liquid (melting), from a liquid to a gas (vaporization), or directly from a solid to a gas (sublimation), the particles gain kinetic energy, allowing them to move more freely and overcome the intermolecular forces holding them together in a more ordered state.
On the phase diagram, these changes are denoted by the purple arrows. Conversely, transitions from a less ordered state to a more ordered state (freezing, condensation, and deposition), indicated by the green arrows, are exothermic. This means energy is released as particles lose kinetic energy and move into a more stable, ordered state.