Write in which of these processes heat is absorbed or releases heat.
1. When candle wax melts
2. When the orange juice solidifies
3. When clouds form.
4. When dew drops are formed
5. When the snowflakes form
Answer: All the processes involve the release of heat.
Explanation: Note to self
Condensation, freezing and deposition release energy.
Evaporation, melting and sublimation absorb energy.
So if you have such a question first identify which process is taking place.
Consider the balanced reaction below:
2N205 → 4NO2 + O2
How many moles of N205 are needed
to produce 7.90 g of NO2?
[?] moles N205
0.0859 mol N2O5
Explanation:
First convert the # of grams of NO2 to moles:
7.90 g NO2 × (1 mol NO2/46.0055 g NO2)
= 0.172 mol NO2
Use the molar ratio to find the # moles of N2O5
0.172 mol NO2 × (2 mol N2O5/4 mol NO2)
= 0.0859 mol N2O5
Determine the hydronium ion concentration
in a solution that is 0.00011 M Ca(OH)2
Answer:
4.5x10⁻¹¹M is the hydronium ion concentration
Explanation:
To solve this concentration we must find, as first, the molar concentration of OH-, [OH-]. With [OH-] we can find pOH, pH, and [H+], hydronium ion concentration, as follows:
[OH-]:
1mol of Ca(OH)2 contains 2 moles of OH-:
0.00011M Ca(OH)2 * (2moles OH- / 1mol Ca(OH)2) = 0.00022M OH-
pOH:
pOH = -log[OH-]
pOH = 3.658
pH:
pH = 14-pOH
pH = 10.34
[H+]:
10^-pH
4.5x10⁻¹¹M is the hydronium ion concentrationWhen copper wire is placed into a silver(I) nitrate solution, silver crystals and copper(I) nitrate solution form. If a 20.0g sample of copper is used, determine the theoretical yield of silver. If 60.0g silver is actually recovered, determine the percent yield of the reactions.
Answer:
Theoretical yield of silver = 67.97 g Ag
Percent yield of the reaction = 88.3%
Explanation:
This reaction forms copper(II) nitrate instead of copper(I) nitrate.
First, we have to write the balanced chemical equation for the reaction of copper (Cu) with silver(I) nitrate (AgNO₃) to give silver (Ag) and copper(I) nitrate (CuNO₃):
Cu(s) + 2AgNO₃(aq) → 2Ag(s) + Cu(NO₃)₂(aq)
From the equation, 1 mol of Cu(s) produces 2 moles of Ag(s). We convert the moles to mass with the molecular weight (MW) of the compounds:
MW(Cu) = 63.5 g/mol
mass of Cu = 1 mol Cu x 63.5 g/mol = 63.5 g Cu
MW(Ag) = 107.9 g/mol
mass of Ag = 2 mol Ag x 107.9 g/mol = 215.8 g Ag
Thus, we have the conversion factor: 215.8 g Ag/63.5 g Cu
- From 20.0 g Cu, the following amount of Ag will be obtained:
20.0 g Cu x 215.8 g Ag/63.5 g Cu = 67.97 g Ag (theoretical amount)
- For an actual amount of 60.0 g of Ag, we calculate the percent yield as follows:
%yield = actual amount/theoretical amount x 100 =
= 60.0 g/67.97 g x 100 = 88.3 %
For parts of the free response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. Answer the following questions related to the analysis of CaBr2. (a) A student has a 10.0g sample of CaBr2. Show the setup of the calculation to determine the number of moles of CaBr2 in the sample. Include units in the setup. (You do not need to do any calculations.)
10.0g of CaBr2 contains 0.05 mol according to the equation mole(n) = mass / molar mass (10.0g CaBr2 x 1 mol CaBr2 / 199.88 g CaBr2 = 0.05 mol)
What exactly does the word "mole" mean?The mole, represented by the symbol mol, is the SI unit of material quantity. One mole is made up of precisely 6.022*1023 elementary components. The Avogadro number, NA, as expressed in mol1, is the fixed numerical expression of the Avogadro number.
Is a mole considered a mass unit?The weight in grams of 1 mole of a certain substance is its molar mass. The atomic mass of the chemical unit, expressed in atomic mass units, determines the mass of a substance (amu).
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Which statement is most likely correct about the average temperatures in San Francisco, California as compared to Norfolk, Virginia?
It is higher in Norfolk because of the cool ocean currents from the north
It is higher in Norfolk because of the warm ocean currents from the south
It is lower in San Francisco because of the cool ocean currents from the south
It is lower in San Francisco because of the warm ocean currents from the north
Answer:
It is higher in Norfolk because of the warm ocean currents from the south
Explanation:
Can I have brainliest answer please?
the highest concentration of life extorts in the top 200 meters of ocean water what is the most important factor that influences this concentration of life
Sodium chloride reacts with silver nitrate. Type of reaction ______________________________ Balance chemical equation:
Sodium chloride reacts with silver nitrate. NaCl + AgNO3 → AgCl + NaNO3
intermolecular forces present in it.
The attracting and repellent forces that develop between the molecules of a substance are known as intermolecular forces or IMF for short. Individual molecules of a substance interact with one another through the mediation of these forces.
Most of the physical and chemical features of matter are caused by intermolecular forces.
An intermolecular force is an attractive force that develops between the protons or positive parts of one molecule and the electrons or negative parts of another molecule. This force affects a substance's many physical and chemical properties. The strength of a material's intermolecular forces directly relates to the boiling point of that substance; the stronger the intermolecular forces, the higher the boiling point.
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When bonding, atoms seek to achieve a stable-
A.
noble gas configuration.
B.
halogen gas configuration.
C.
low ionization energy configuration.
D.
high electronegativity configuration
When bonding, atoms try to achieve a stable noble gas configuration.
Atoms are always trying to achieve stability. In the modern periodic table, noble gases present in the group 18 are the most stable. They have a completely filled outermost or the valence shell, that is, it contains 8 valence electrons in its valence shell.
Due to this stable electronic configuration, they are inert in nature, that is, they do not have a tendency to react by sharing or losing their electrons. When participating in a bonding, atoms try to lose or gain electrons to reach their nearest noble gas configuration and attain stability.
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1. If there is a switch it needs to be turned on. If not, the circuit will be
A. Open
B. Closed
C. Frozen
D. All of the above
Answer:
The Circuit will be OPEN since the current source is disconnected.
So if its not turned on... The circuit remains Open
Answer
Option A.
Calculate the volume that 0.540 mol of propane (C3H8) occupies at STP.
Answer:
i got 12.1 as my answer hope it is right
The the volume that 0.540 mol of propane (C3H8) occupies at STP is 12.1 l.
What is volume ?Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected.
The molar volume (Vm) is the volume occupied by one mole of a chemical element or chemical compound at standard temperature and pressure (STP). You may figure it out by dividing the mass density () by the molar mass (M).
From the ideal gas law; V = nRT/ P
where,
n = 0.540 mol
universal gas constant R = 8.314 J/mol·K
standard temperature T = 273.15 K
standard pressure P = 101 325 Pa
Substituting the values into the formula ;
= 0.540 × 8.314 × 273.15 / 101.325
= 0.0121 m³
= 12.1 l
Thus, The the volume that 0.540 mol of propane (C3H8) occupies at STP is 12.1 l.
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The zeroth law of thermodynamics describes the state where we can say what about the movement of heat between two substances?
a. the latent heat is increasing
b. the movement of heat is rapid
c. there is no movement of heat
d. the latent heat is decreasing
e. the movement of heat is slow
There is no movement of heat. The Zeroth Law of Thermodynamics states that if two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.
What is Thermodynamics?Thermodynamics is the study of energy and its transformations. It examines the relationships between heat, work, and other forms of energy. The fundamental laws of thermodynamics provide a framework for studying the behavior of systems, whether they are physical, chemical, or biological in nature. Thermodynamics helps us understand the behavior of gases, liquids, and solids and how they interact with each other. It also provides us with a way to analyze how energy is transferred and used in various processes.
In other words, no heat transfer takes place between two systems that are in thermal equilibrium.
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If I contain 5 moles of gas in a container with a volume of 62 liters and at a temperature of 222 K, what is the pressure inside the container?
The pressure inside the container with 5 moles of gas, 62 liters volume and 222K temperature is 1.46 atm.
Ideal gas law illustrates the relation between pressure, volume and temperature of a gas. It is represented by the equation
PV = nRT
Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant and T is the temperature.
V = 62 liters
n = 5 moles
R = 0.0821 L(atm) mol⁻¹K⁻¹
T = 222K
PV = nRT
P × 62 = 5 × 0.0821 × 222
P = 5 × 0.0821 × 222/62
P = 1.46 atm
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You travel 35 meters in 26 seconds, what is your average speed?
Answer:
1.346 meters per second
Explanation:
You traveled 35 meters in 26 seconds
35 / 26 = avg speed.
35 / 26 = 1.346...
Draw two isomers of this, and name each one: C4H6
Two isomers are Butadiene Bicyclobutane.
What is isomers?Isomers are substances that contain precisely the same number of atoms, i.e., they have the exact same empirical formula, but they differ from one another by the arrangement of the atoms. Ethylbenzene, m-xylene, p-xylene, and o-xylene are a few isomers with the formula C8H10.The term "isomer" refers to molecules or polyatomic ions that have different configurations of atoms in space but the same number of atoms in their molecular formulas, or the number of atoms in each element. Isomerism is the presence or potential for isomers. Isomers may or may not have comparable chemical or physical properties.Isomerism results from the ability of atoms in a molecular formula to be organized in different ways, resulting in compounds with diverse physical and chemical properties. They number two.To learn more about isomers refers to:
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How many grams of zinc metal will be produced by treating 54. 0 grams of
aluminum with a solution of zinc chloride, ZnCl,?
(A:196 g Zn)
By treating 54.0 grams of aluminum with a solution of zinc chloride, ZnCl, 328.6g/mol of zinc metal will be created.
The definition of molar mass.The molar mass of a substance is its mass expressed in grams per mole. As shown in this video, the molar mass of a substance can be calculated by adding the molar masses of the substance's component atoms. The number of moles in the substance can then be calculated from its molar mass and converted to mass.
Balance chemical reaction,
2Al + 3ZnCl₂ → 2AlCl₃ +3Zn
Molar mass of aluminum is 27.99g/mol
Molar mass of zinc chloride is 136.29g/mol
The mole ratio of ZnCl₂ to Al is 3:2
Grams → moles → moles → grams
45Al × 1mol Al/27.99g Al × 3 mol ZnCl₂/2 mol Al × 136.29 g ZnCl₂/1 mol ZnCl₂
on simplification,
45×3×136.29/27.99×2 = 328.6g/mol.
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use the word chemistry in a sentence, make it unique and not something I've heard.
Explanation:
The issue of Pollution in our the oceans has changed the chemistry of water.
What is the molar it's if the HBr solution if 0.500 liters are titrated to an endpoint by 0.100 liters of a 2.00 M KOH solution
Answer:
0.4 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
HBr + KOH —> KBr + H₂O
From the balanced equation above,
The mole ratio of the acid, HBr (nₐ) = 1
The mole ratio of the base, KOH (n₆) = 1
Finally, we shall determine the molarity of HBr. This can be obtained as follow:
Volume of acid, HBr (Vₐ) = 0.5 L
Volume of base, KOH (V₆) = 0.1 L
Molarity of base, KOH (M₆) = 2 M
Molarity of acid, HBr (Mₐ) =?
MₐVₐ / M₆V₆ = nₐ/n₆
Mₐ × 0.5 / 2 × 0.1 = 1
Mₐ × 0.5 / 0.2 = 1
Cross multiply
Mₐ × 0.5 = 0.2
Divide both side by 0.5
Mₐ = 0.2 / 0.5
Mₐ = 0.4 M
Thus, the molarity of the HBr solution is 0.4 M
A controlled experiment _____.Group of answer choicesIs repeated many times to ensure that the results are accurateProceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental dataIncludes at least two groups, one of which does not receive the experimental treatmentIncludes at least two groups, one differing from the other by two or more variables
An experimental group and a control group are both included in a controlled experiment. At least one of the two groups—the group that is not subjected to the experimental treatment—is present in a controlled experiment.
In controlled experiment, the researcher wants to determine how one or more variables affects on something. Since many different variables affecting the results, and most of them are not of interest to the researcher, and they will kept under control. They must remain constant. There must be at least of two groups. One of them is control group, and the other one is experimental group.
During experiment, a researcher compares between two groups. Both are composed of individuals which is coming from same population, so they are very identical in all the aspects except for independent variables that the researcher changes in to the experimental group and they observe that how they will affect the individuals. Control group is used to identify any of the other factors influencing the results which is obtained in the study, apart from the modified variables of the treatment. Independent variable keeps constant in control group.
The experimental group receives the treatment. The researcher voluntarily modifies the independent variable's values to see how it impacts the subjects. There can be several experimental groups.
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regardless of where you live and what tempurature it is outside, you should always start the vehicle and give it a few minutes to warm up
The statement given is true. No matter where you live or what the outside temperature is, you should always start your vehicle and let it warm up for a few minutes.
Define temperature.An object's thermal energy content is measured by its temperature, while heat is the movement of thermal energy between objects of different temperatures.
The average kinetic energy of all the atoms or molecules that make up matter defines temperature in chemistry. Not all materials have the same kinetic energy. A particle can be described using the kinetic energy distribution of the particle at a point in time.
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The complete question is as follows:
Regardless of where you live and what temperature it is outside, you should always start the vehicle and give it a few minutes to warm up. (True/False)
Please Help :,D
43.5-g of cesium explosively reacts with water to form hydrogen gas and cesium hydroxide. How many moles of hydrogen gas were formed?
2Cs(s) + 2H2O(l) --> 2CsOH(s) + 1H2(g)
Calculate the mass of silver needed to react with chlorine to produce 42 g of silver chloride.
2Ag(s) + Cl2(g) --> 2AgCl(s)
Silver Nitrate reacts with sodium chloride to make the silver chloride and sodium nitrate. When 12.65 grams of silver nitrate is reacted. How many grams of silver chloride are formed?
AgNO3(s) + NaCl --> AgCl(s) + NaNO3(aq)
Calcium Carbonate decomposes into calcium oxide and a common gas, carbon dioxide. When 91.0 grams of calcium oxide is formed how many liters of carbon dioxide gas is also formed from this reaction. First find the number of moles of carbon dioxide gas actually formed in the reaction, then use the following conversion factor: 1 mol CO2(g) = 22.4 Liters of CO2(g)
CaCO3(s) + HEAT --> CaO(s) + CO2(g)
Answer:
See the attached images for solution.
A particular brand of gasoline has a density of 0.733 g/mL at 25 oC. How many grams of this gasoline would fill a 10.7 gal tank (1 US gal
For a certain brand of gasoline, which has a density of 0.733 g/mL at 25 oC, 41848 grammes would fill a 10.7 gal tank. Mass in relation to volume is referred to as density.
Although the Latin letter D can also be used, the symbol for density is most frequently written as (the lower case Greek letter rho). Any combination of gases can be considered a gas gas solution. As a result of their great distance from one another, gas molecules typically only interact very little. All gases can therefore be thought of as being soluble in one another.
15x 3785.41 ml = 56781.15 ml. Consequently, the mass is calculated as 0.737g/ml x 56781.15 ml = 41848 grammes.
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two forces are applied to a large box.one force is pushing it to the right and another equal force is also pushing it the right. which is true about the box's movement?
Answer: Not moving at all?
Explanation:
...
the data in the table show the amount of 500 g sample of sodium-24 over time. make a graph of the data (remember to label all axes and title the graph)
The amount of sodium-24 decreases to approximately 125 g.
What is sodium?Sodium is a chemical element with the symbol Na on the periodic table. It is a soft, silvery-white, highly reactive metal and is a member of the alkali metal group of chemical elements.
The graph below shows the amount of 500 g sample of sodium-24 over time. The x-axis of the graph represents time (in hours), and the y-axis represents the amount of sodium-24 (in grams). The title of the graph is "Amount of sodium-24 in 500 g Sample Over Time".
The graph shows that the amount of sodium-24 in the sample decreases over time. After 24 hours, the amount of sodium-24 in the sample decreases to approximately 375 g. After 48 hours, the amount of sodium-24 decreases to approximately 250 g. After 72 hours, the amount of sodium-24 decreases to approximately 125 g.
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What must occur for the enthalpy of solution to be negative?
The process of separating the solvent particles from one another must release energy.
The process of separating the solute particles from one another must release energy.
More energy is absorbed as the solute and solvent mix than is released when the solute particles and the solvent particles separate.
More energy is released as the solute and solvent mix than is absorbed when the solute particles and the solvent particles separate.
Answer:
d on edge my guys.
Explanation:
Mg + _________HCI →
_____ H₂ + _____ MgCh
Mg + 2HCl → H2 + MgCl2 because The reaction between magnesium and hydrochloric acid produces hydrogen gas and magnesium chloride.
What is molecule?Molecules are the smallest unit of a chemical compound that can exist independently and remain unchanged in chemical composition. A molecule is composed of two or more atoms that are chemically bonded together. A molecule can be made up of different elements, such as carbon, hydrogen, oxygen, and nitrogen, and can be composed of a variety of combinations of these elements. Molecules are essential components of all living things, as they are important for basic functions such as energy transfer, metabolism, and cell structure.
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1.____________________ is the amount of energy that it takes to raise the temperature of 1 gram of a substance by 1 degree kelvin
Answer: 1joule
Explanation:
If 100.0 grams of C3H8 burns, how many moles of carbon dioxide will form?
Answer:
6.82 Mol CO2
Explanation:
PLS ANSWER ASAP The following reaction occurs in a car’s catalytic converter.
2NO(g) + 2CO(g) ----> N2(g) + 2CO2(g)
Which answer BEST describes the reducing and oxidizing processes in this reaction?
a. NO and CO are both reducing agents.
b. NO and CO are both oxidizing agents.
c. The oxidation state of nitrogen in NO changes from +2 to 0, and the oxidation state of carbon in CO changes from +2 to +4 as the reaction proceeds.
d. The oxidation state of nitrogen in NO changes from 0 to +2, and the oxidation state of carbon in CO changes from +4 to +2 as the reaction proceeds.
Answer:
Its B
Explanation: I did the test passed btw
Use the drawing to help explain why gas pressure decreases when gas is removed from acontainer with a fixed volume
When gas is removed from a container with a fixed volume, the number of gas particles decreases, so there are fewer collisions and thus less pressure.
Additionally, the remaining gas particles have more space to move around, which also leads to a decrease in pressure. This can be visualized in the drawing by the decrease in the number of gas particles and the increased distance between them as gas is removed from the container.
As the gas particles decrease, there are fewer particles to collide with the walls of the container and therefore less force is exerted on the walls. This results in a decrease in the pressure inside the container.
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