Answer:
False.
Explanation:
Entrée is a culinary term used for a course during a meal service. In parts of the US and Canada, the word entrée is often used to refer to the main dish that is served while in other parts of the world, it usually means the starter or the simple meal that is served before the main dish / course. Entrées can be made of any component but the content of the natural ingredients does not define its healthy status. Thus, it is false to say that any entrée can be labelled "healthy" on a menu as long as it contains natural ingredients.
How many molecules does 0.773 moles of Ca(OH)2 contain?
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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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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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 nitrogen-14 atoms does it take to equal the mass of three calcium-42 atoms?question 6 options:8.5793impossible to determine without additional information?
the answer is 9. took the test and got it correct
Net ionic equations for potassium sulfate plus calcium phosphate yields
How many moles of sodium acetate (nach3coo) must be added to 1.000 liter of a 0.500 m solution of acetic acid (ch3cooh) to produce a ph of 5.675? the ionization constant of acetic acid is 1.8 × 10−5 ?
ck(CH₃COOH) = 0,5 M.
V = 1 L.
Ka = 1,8·10⁻⁵.
pKa = -logKa = 4,75.
pH = 5,675.
Henderson–Hasselbalch equation: pH = pKa +
log(cs/ck).
5,675 = 4,75 + log(cs/ck).
log(cs/ck) = 5,675 - 4,75 = 0,925.
cs/ck = 10∧(0,925) = 8,4.
cs = 8,4 · 0,5 M = 4,2 M.
n(CH₃COONa) = 4,2 mol/L · 1 L = 4,2 mol.
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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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
#1: Lemon juice is a weak acid. It has a [H+] of 5.0 × 10^-2 M. What is the pH of lemon juice?
A. 1.0
B. 1.3
C. 5.0
D. 7.5
***my answer: B. 1.3
is that right?,
How many grams of ch3oh must be added to water to prepare 325 ml of a solution that is 4.50 mch3oh?
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.
Sodium ions are present in relatively small concentrations compared to other extracellular cations true or false
The answer is false.
Within the extracellular fluid (ECF), the major cation is sodium (Na⁺) while the major cation in the intracellular fluid is potassium (K⁺). Sodium-potassium pump, is a solute pump that pumps three sodium ions out of the cell in exchange for two potassium ions pumped in the cell, both against their concentration gradients.These electrolytes play an important role in maintaining homeostasis. The ECF, in particular the interstitial fluid, is surrounding all of the cells in the body and therefore is crucial for their normal functions. The ECF is maintained by a number of homeostatic mechanisms including regulation of sodium concentration.
Potassium, calcium (Ca²⁺) and magnesium (Mg²⁺)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
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.
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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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.
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]
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.
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.
Calculate ΔH∘ in kilojoules for the reaction of ammonia (ΔH∘f=−46.1 kJ/mol) with O2 to yield nitric oxide NO (ΔH∘f=91.3 kJ/mol) and H2O(g) (ΔH∘f=−241.8 kJ/mol), a step in the Ostwald process for the commercial production of nitric acid.,
Final answer:
The standard enthalpy change (ΔH°) for the reaction of ammonia with O2 to yield nitric oxide and H2O(g) is calculated using standard enthalpies of formation and is found to be -633.2 kJ.
Explanation:
To calculate the standard enthalpy change (ΔH°) for the reaction of ammonia (NH3) with O2 to yield nitric oxide (NO) and H2O(g), we can use the standard enthalpies of formation (ΔH°f) for the reactants and products. Unfortunately, the provided information contains several elements that are not relevant to this question. Let us use the correct ΔH°f values to find the ΔH° for this reaction. Assuming we have balanced the equation and it is:
4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)
The formula to calculate ΔH° is:
ΔH° = [∑ (ΔH°f products) × (moles of product)] - [∑ (ΔH°f reactants) × (moles of reactant)]
Using the values given for ΔH°f:
ΔH°f NH3 = -46.1 kJ/mol
ΔH°f NO = 91.3 kJ/mol
ΔH°f H2O(g) = -241.8 kJ/mol
For the reaction:
ΔH° = [4×91.3 kJ/mol + 6×(-241.8 kJ/mol)] - [4×(-46.1 kJ/mol) + 5×0 kJ/mol]
ΔH° = (365.2 kJ - (-1448.8 kJ)) - (-184.4 kJ + 0 kJ)
ΔH° = -817.6 kJ + 184.4 kJ
ΔH° = -633.2 kJ
Therefore, the standard enthalpy change for the reaction is -633.2 kJ.
Plants make food through photosynthesis, a chemical reaction. What are the starting substances of the reaction? hydrogen, oxygen, and carbon oxygen, solar energy, and water carbon dioxide, solar energy, and oxygen carbon dioxide, water, and solar energy
Photosynthesis is a chemical process used by plants where solar energy is used to transform carbon dioxide and water into carbohydrates and oxygen.
What is photosynthesis?It is the biochemical process by which plants convert inorganic matter (carbon dioxide and water) into organic matter (sugars), taking advantage of energy from sunlight.
This process constitutes one of the most important biochemical mechanisms on the planet since it involves the manufacture of organic nutrients that store light energy from the Sun.
Therefore, we can conclude that photosynthesis is the process carried out by plants to transform inorganic matter (Carbon dioxide, water and solar energy) into organic substances.
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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 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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which statement accurately describes the origin and expansion of the universe
Answer:
Cosmic background radiation is leftover thermal energy from the big bang.
Explanation:
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.,
URGENT
1. An igneous rock that forms from long, slow cooling is characterized by
A: no crystallization
B: microscopic crystals
C: large, well-defined crystals
Question 2.2. Igneous rocks form when
A: collected sediments accumulate over time
B: extreme heat and pressure change a pre-existing rock
C: magma cools and solidifies
Question 3.3. An igneous rock displays coarse-sized grains that can easily be seen with the naked eyes. The rock is most likely
A: extrusive
B: intrusive
C: volcanic,
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.
A ________ zone is the place where two lithospheric plates converge, one riding over the other. Most volcanoes on land occur parallel to the boundary between the two plates.
a.continental
b.convergent
c.subduction
d.volcanowhat fits in the blank?
The answer is C. Subduction
If a reaction has an equilibrium constant slightly greater than 1, what type of reaction is it?