All substances are composed of which type of matter?
a. ions
b. mixtures
c. elements
d. molecules
What is the volume of 120 mg of water?
A. 1.2 dL
B. 120 mL
C. 120 L
D. 1.2 L
How many grams of ch3oh must be added to water to prepare 325 ml of a solution that is 4.50 mch3oh?
Thermal energy is the energy associated with..
electric fields.
being stored in chemical bonds.
the pull of gravity.
temperature.
@aaronq,
Answer:
D. Temperature
Explanation:
This is the correct answer on edge.
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.
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:
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
An isotope contains 56 protons, 54 electrons, and 74 neutrons. What is the identity of the isotope?
Answer:
The element will be represented as : [tex]Ba_{56}^{130}[/tex]
Explanation:
The identity of an element (isotope) is with its atomic number.
The atomic number is the number of protons in the element.
Irrespective of the number of electrons / neutrons the atomic number will be equal to the number of protons only.
atomic number of the isotope is 56.
The element with 56 atomic number is Barium
The mass number of Barium = protons + neutrons = 56 + 74 = 130
The element will be represented as : [tex]Ba_{56}^{130}[/tex]
Net ionic equations for potassium sulfate plus calcium phosphate yields
How many grams are in .98 mols of C6H12O6 (*round to the nearest hundredth and include the unit "g C6H12O6" after your number)
How many molecules does 0.773 moles of Ca(OH)2 contain?
Which equation represents the reduction half-reaction for this redox equation?
Mg + CuSO4 MgSO4 + Cu
A. Cu Cu
B. Cu + 2e- Cu
C. Cu Cu + 2e-
D. Cu + 3e- Cu,
The oxidation number of Cu in CuSO₄ is +2 and 0 in Cu, the free elemental form. As the oxidation of Cu decreases from +2 to 0, we are looking at the reduction half-reaction for the given redox reaction:
Cu²⁺ + 2e⁻ → Cu
The correct answer is option B.
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.
1-Which of the following statements is not a description of Saturn?
Known for its rings
Largest planet in the solar system
One of the gas giant planets
Has several moons
2-Which of the following statements is not a description of Mars?
Has a reddish color
Has a thin atmosphere
One of the rocky planets
Has no moons
3-Planets move around the sun in elliptical orbits.
True
False
4-Which of the following statements is not a description of asteroids?
They orbit the sun.
They vary in size and shape.
Most of them lie in a belt between Earth and Mars.
They are thought to be remains that never formed a planet.
5-According to the chart below, which planet has the smallest inner core? (look at image)
Mars
Jupiter
Venus
Earth
6-Two planets are orbiting a star. Planet A is closer to the star than Planet B. Which description explains the expected motion of Planets A and B?
The average speed of Planet B is faster than that of Planet A.
The average speed of Planet B is equal to that of Planet B.
The orbital period of Planet B is shorter than that of Planet A.
The orbital period of planet A is shorter than that of Planet B.
Answer:
1. Largest planet in the solar system.
2. Has no moons.
3. True
4. Most of them lie in a belt between Earth and Mars.
5. Earth
6. The orbital period of planet A is shorter than that of Planet B.
Explanation:
1. Saturn is the second largest planet of the solar system. It is a gaseous planet which is known as the Ringed planet because of the beautiful ring system which are visible from Earth through telescope. It has several moons - more than 60 moons.
2. Mars is known as red planet. It is the fourth planet from the sun. It is one of the rocky planets having very thin atmosphere. It has two moons - Phobos and Deimos.
3. From Kepler's first law of planetary motion we know that planets move around Sun in an elliptical orbit with sun at its foci. Thus, the given statement is true.
4. Asteroids are irregular shaped and sized rocky objects orbiting sun . These are thought to be remains of a never formed planet between Mars and Jupiter. Thus, majority of the asteroids are found between the orbits of these two planets.
5. There are four terrestrial planets ( Mercury, Venus, Earth and Mars). The terrestrial planets have the following layers- the core, the mantle and the crust. Out of these four planets- the Earth has the smallest inner core.
6. From Kepler's laws about planetary motion, we know that the planet closer to the Star moves with greater orbital speed and thus has shorter orbital period than the rest. Here, planet A is closer to the star than planet B. Thus, planet A would have shorter orbital period than planet B.
This detailed answer provides accurate explanations for each question, covering topics related to the description of Saturn, Mars, elliptical orbits, asteroids, planet cores, and orbital motion.
Explanation:
1- The statement 'Largest planet in the solar system' is not a description of Saturn. Saturn is actually the second-largest planet in our solar system, with Jupiter being the largest.
2- The statement 'Has no moons' is not a description of Mars. Mars actually has two moons, named Phobos and Deimos.
3- The statement is true. Planets do move around the sun in elliptical orbits. An elliptical orbit is a slightly elongated circle, and this is the shape followed by the planets in our solar system.
4- The statement 'They are thought to be remains that never formed a planet' is not a description of asteroids. Asteroids are actually rocky fragments that orbit the sun but are too small to be considered planets. Some asteroids may be remnants from the early formation of the solar system, but not all of them.
5- According to the chart, Venus has the smallest inner core. The chart shows that Venus has the smallest inner core compared to Mars, Jupiter, and Earth.
6- The description that explains the expected motion of Planets A and B is that the orbital period of Planet B is shorter than that of Planet A. When a planet is closer to the star, its orbital period is shorter, which means it completes its orbit more quickly than a planet that is farther away.
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Determine the ph at the equivalence (stoichiometric) point in the titration of 32 ml
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
Enough of a monoprotic acid is dissolved in water to produce a 0.0121 M solution. The pH of the resulting solution is 6.49. Calculate the Ka for the acid.,
Which state of matter has a constant volume, but changes shape?\?
which statement accurately describes the origin and expansion of the universe
Answer:
Cosmic background radiation is leftover thermal energy from the big bang.
Explanation:
list the 7 diatomic molecules
Answer is: nitrogen(N₂), oxygen(O₂), hydrogen(H₂), carbon monoxide(CO), calcium oxide(CaO), hydrogen chloride(HCl), sodium hydride(NaH).
Diatomic molecules are molecules made of two atoms.
They can be homonuclear (molecule made of two atoms of the same element) and heteronuclear (molecule made of two different atoms).
The volume of a gas is reduced from 4 l to 0.5 l while the temperature is held constant. what does the pressure of the gas do?
The pressure of the gas increases when its volume is reduced from 4 L to 0.5 L at constant temperature, according to Boyle's Law, which dictates an inverse relationship between volume and pressure for a given amount of gas.
When the volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant, according to Boyle's Law, the pressure of the gas increases. Boyle's Law states that at constant temperature, the volume of a fixed number of moles of a gas is inversely proportional to the pressure applied to it. This means that if you decrease the volume of the gas, the pressure must increase to compensate, assuming the amount of gas does not change.
Therefore, in this case where the volume decreases by a factor of 8 (from 4 L to 0.5 L), the pressure must increase by the same factor, assuming that no gas escapes and the temperature remains constant. It's important to note that these principles assume ideal gas behavior and may not perfectly model real gases under all conditions.
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.
How do you think the number of valence electrons relates to an element's chemical properties?
Answer:
Electrons in the outermost shell are called valence electrons, because it is their interactions that determine the chemical properties of an element. The columns that were set up to group elements by similar chemical properties turn out to be the exact same columns defined by the number of valence electrons.
The valence electron of an element determines the group of the element and elements in the same group have similar chemical properties.
The valence electron of an element indicates its the group of the element in the periodic table. Elements found within the same group in the periodic table have similar chemical properties.
For example:
group 1 elements (Alkali metals) have similar chemical propertiesgroup 7 elements (halogens) have similar chemical propertiesThus, we can conclude that valence electron of an element determines the group of the element and elements in the same group have similar chemical properties.
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The helium flash converts helium to the heavier element _____.
The helium flash, a nearly explosive ignition in a red giant star's core, converts helium into carbon through the triple-alpha process. This marks a crucial step in stellar evolution involving the production of heavier elements. Recognized by two protons in its nucleus, helium exists as the second most abundant element in the universe.
Explanation:The helium flash refers to a nearly explosive ignition of helium as a part of the triple-alpha process in the dense core of a red giant star. During the helium flash, helium (a lighter element) is converted into a heavier element, specifically, carbon. Managed through a sequence called the triple-alpha process, three helium-4 nuclei combine to form a carbon-12 nucleus.
The process of forming helium from hydrogen involves addition of another proton to create the helium nucleus, emitting significant energy. As a part of stellar evolution, the complete exhaustion of helium in the core leads to the production of heavier elements like oxygen, neon, and magnesium, by the fusion of carbon.
For context, helium is the second-most abundant element in the universe, discovered in 1868, and is defined by its two protons within the nucleus. This element is most commonly known as the light gas used to inflate balloons.
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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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The number of moles of mgo produced when 0.20 mole of o2 reacts completely is ________. 2mg + o2 → 2mgo
The reaction of 0.20 moles of oxygen on complete utilization produces 0.40 moles of MgO.
From the reaction,
1 mole of oxygen produced 2 moles of MgO.
So, 0.20 moles of oxygen produces:
Moles of MgO produced = 0.20 [tex]\times[/tex] 2
Moles of MgO produced = 0.40 moles.
The reaction of 0.20 moles of oxygen on complete utilization produces 0.40 moles of MgO.
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If a reaction has an equilibrium constant slightly greater than 1, what type of reaction is it?
Where do the OH- ions go as additional acid is added?
1. they evaporate.
2. They combine with excess H+ ions to form more water.
3. They remain in solution at the same concentration.
4. They remain in solution but change concentration.,
Answer:
A: They evaporate
Explanation:
Where do the OH- ions go as additional acid is added? They evaporate. They combine with excess H+ ions to form more water. They remain in the solution at the same concentration.