Answers
Answer:
213 kJ-1704 kJ852 kJ (ignore what's on my paper, accidentally added a negative)Explanation:
These problems are pretty easy, you just need to do to the enthalpy what is done to the equation itself. Numbers one and 3 are reversed, so they become positive values. When a coefficient changes in the equation, you multiply the enthalpy by that number. I have attached my work below. Let me know if there is any confusion left.
Hope this helped! :^)
Related Questions
A chemist makes up a solution by dissolving 42.0 g of Mg(NO3)2 in enough water to produce a final solution volume of 213 mL. To calculate the molarity of the solution, what additional information is needed
Answers
Answer:
the molar mass of Mg(NO3)2
the mass of the water added the density of the Mg(NO3)2
the volume of water used
Calculate the number of moles of Mg(NO3)2 used to make up this solution. 42.0 g of Mg(NO3)2 is equivalent to___ mol Mg(NO3)2.
Now calculate the molarity of the solution, giving your answer to the correct number of significant digits.
Molarity of Mg(NO3)2 = ___M
Consider the following reaction: 2A + 3B --> 2C If you have 2 moles of A and 6 moles of B, what is the maximum number of moles of C that can be made by the reaction
Answers
Answer:
2 moles of C and no more
Explanation:
Consider the following reaction: 2A + 3B --> 2C If you have 2 moles of A and 6 moles of B, what is the maximum number of moles of C that can be made by the reaction
2A + 3B --> 2C '
2 of A make 2 of C if we have atleast 3 of B.
we ave more than enough B
2 of A will make 2 moles of C and no more
Think about the parts of an egg, and write down why you think it can act as a model of an animal cell. Also write down your predictions of what will happen when you leave an egg in vinegar for three days.
Answers
Answer:
Explanation:
Determine the treatments you’ll be using on your eggs, and prepare the substances you’ll need. You can make salt-water solutions by dissolving different amounts of table salt in containers of water (e.g. 100g, 200g, 300g of salt (NaCl) per liter). You can make solutions of food coloring by adding a few drops of each color into containers of
The Eggsperiment with Vinegar solution. The first experiment conducted was the egg placed in vinegar solution which allowed the egg to become soft and bouncy . Vinegar is a weak acid which is 5% acetic acid in water (meaning vinegar is largely just water). The egg has a shell that is made up of calcium carbonate an air cell forms at the large end of the egg. While the embryo is growing, the shell membranes surround and contain the white or albumen of the egg. The albumen provides the liquid medium in which the embryo develops, and it also contains a large amount of the protein necessary for proper development. I hope this was hopeful
He says that because the oxygen atoms are split between two different molecules in the products, the equation does not support the law of conservation of matter. Is your friend right? explain your answer?
Answers
According to conservation of matter, there should be equal amounts of all elements on both the reactant and product side.
Reactant:
1 Ca
1 C
1 O
Product:
1 Ca
1 C
3 O
Therefore, your friend is right because the law of conservation of matter is not followed in this chemical equation.
(e) alkaline earth element with the least massive atoms
Answers
The alkaline earth element with the least massive atoms is beryllium (Be). Beryllium, located in Group 2 of the periodic table, possesses the lowest atomic number and atomic mass within the alkaline earth elements.
Among the alkaline earth elements, which are found in Group 2 of the periodic table, beryllium (Be) stands out for having the least massive atoms. The periodic table is organized in a way that elements are ordered by increasing atomic number, which corresponds to the number of protons in an atom's nucleus. For alkaline earth elements, the atomic numbers increase from beryllium (Be) with atomic number 4 to radium (Ra) with atomic number 88.
Atomic mass, on the other hand, takes into account the sum of protons and neutrons in an atom's nucleus, as electrons contribute very little to the overall mass. Since beryllium (Be) has the lowest atomic number in the alkaline earth group, it also has the fewest protons and neutrons among its isotopes, leading to a lower atomic mass compared to other elements in the same group.
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How do weak intermolecular bond strengths affect the melting and boiling point of a substance? (Picture is of answers I can choose from)
Answers
This is because weak intermolecular forces need less energy for the forces to break compared to strong intermolecular forces. Less energy required means lower temperatures - low melting and boiling points
For a weak intermolecular bond, both the melting point and boiling point are lower.
A lesser energy is required to break bond of weak intermolecular forces while a greater energy is required to break bond of strong intermolecular forces.
E ∝ T
where;
E is the energy required to break the bondT is the temperatureA lesser energy means a lower temperature and a lower temperature will result in lower boiling point and melting point.
Thus, we can conclude that for a weak intermolecular bond, both the melting point and boiling point are lower.
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Balancing Chemical Equations
Based on the chemical equation, use the drop down menu to choose the coefficients that will balance the chemical
equation
(vbo,- (v]),
Will make Brainlyest plzzzz help!!!
Answers
Answer:
3O2→ 2O3
Explanation:
by multiplying 2 by 3 we get 6 on both sides
What is a solution?
A. A mixture of two solids blended together
B. A compound that is in liquid and gas states
C. A liquid with something dissolved in it
OD. A clear liquid with nothing dissolved in it
Answers
Hey! Please help. Will mark brainlist if u are right, ty
Answers
Answer:
40 hopefully right
Explanation:
Aluminium reacts with sulfuric acid to form aluminium sulfate and hydrogen. What is the volume of
hydrogen gas in liters (L) produced at 300 K and 1.0 atm pressure, when 5.4 g of aluminium and
50.0 mL of 5.0 M sulfuric acid are combined for the reaction?
Answers
Answer:
[tex]2al + 3h2so4 = > al2(so4)3 + 3h2 \\ eqvt \\ = > \frac{5.4}{27} = > \frac{5 \times 50}{1000} \\ .2 \: mol = > .25 \: mol \\ \\ so \: .25 \: is \: limiting \: reagent \\ according \: to \: ideal \: gas \: equation \\ pv = nrt \\ v = \frac{nrt}{p} \\ v = \frac{.25 \times .082 \times 300}{1} \\ = \frac{1}{4} \times 8.2 \times 3 \\ = 2.05 \times 3 \\ = 6.15litre \\ thank \: you[/tex]
I need help with the second and third part of this problem.
Answers
People use solution of Na3PO4 to clean walls before putting up wall paper. If the entration is 1.7% (m/v). What mass of Na3PO4 is needed to make 2L of solution?
Answers
Answer:
34 grams
Explanation:
Assuming m/v means mass of solute / volume of solvent, then set up the equation:
1.7/100=m/2000, by cross multiplication, m=34 grams
A cylinder contains helium gas with a volume of 2.60 L at 20 C and 768 mm Hg. If the balloon ascends to an altitude where the helium pressure is 614 mm Hg, what is the volume of gas? (Assume the temperature has not changed)
a. 12.2
b. 1.2
c. 20.2
d. 3.2
Answers
Answer: 3.2 [D]
Explanation:
Use Boyles law
(Might want to rotate image, sorry!)
The metallic character of an element is defined as the properties typical of a metal, especially the tendency to lose electrons in chemical reactions.
Arrange the following elements in order of decreasing metallic character.
P, Zn, Cr, Cs, F, S, Ca
Rank from most to least metallic character. To rank items as equivalent, overlap them.
Answers
Answer:
Rb, Zn, P, S, F, Ca, Co, Cr
Rb, Zn, P, S, F, Ca, Co, Cr elements in order of decreasing metallic character.
What is a metallic character?The metallic character of an element is defined as the properties typical of metal, especially the tendency to lose electrons in chemical reactions.
Metallic character depends on the ability of an element to lose its outer valence electrons. Examples of properties related to metallic character include thermal and electrical conductivity, metallic lustre, hardness, ductility, and malleability. The most "metallic" element is francium, followed by caesium.
Hence, Rb, Zn, P, S, F, Ca, Co, and Cr elements in order of decreasing metallic character.
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Identify key concepts/terminologies about solutions or concentration of solutions
PLS HELP ASAP!!
Answers
identify keys concepts/terminologies about solutions or concentration of solutions.
Answer:They are the two basic solution concentration terms that you need to know.We always need to keep an account of the amount of solute in a solution.The amount of solute in the solvent is what is called the concentration of a solution.In chemistry,we define concentration of solution as the amount of solute in a solvent.
Explanation:Depending upon amount of solute present,it is called a dilute, concentrated or a saturated solution.Different substances in a given solvent have a different solubilities at the same temperature.The most common method for expressing the concentration of a solution is the percentage method
#Carry On Learning :)Calculate the pH at the equivalence point for the following titration: 0.25 M HCOOH versus 0.25 M NaOH.
Answers
The pH at the equivalence point for the titration of 0.25 M HCOOH versus 0.25 M NaOH is 8.5.
Let's consider the following neutralization reaction.
HCOOH + NaOH ⇒ HCOONa + H₂O
At the equivalence point, 0.25 M HCOOH completely reacted with 0.25 M NaOH to form 0.25 M HCOONa.
HCOONa undergoes hydrolysis. The net ionic equation is:
HCOO⁻(aq) + H₂O(l) ⇄ HCOOH(aq) + OH⁻(aq)
Given the concentration of HCOO⁻ is 0.25 M (Cb) and the basic dissociation constant of HCOO⁻ is 4.8 × 10⁻¹¹ (Kb), we can calculate the concentration of OH⁻ using the following expression.
[tex][OH^{-} ] = \sqrt{Kb \times Cb } = \sqrt{(4.8 \times 10^{-11} ) \times 0.25 } = 3.5 \times 10^{-6} M[/tex]
The pOH of the solution is:
[tex]pOH = -log [OH^{-} ] = -log (3.5 \times 10^{-6} ) = 5.5[/tex]
The pH of the solution is:
[tex]pH = 14 -pOH = 14 -5.5 = 8.5[/tex]
The pH at the equivalence point for the titration of 0.25 M HCOOH versus 0.25 M NaOH is 8.5.
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(100 POINTS!!!!) In one to two sentences, describe the process by which the ionic compound, LiCl, would dissolve in the polar solvent, CH3COCH3
Answers
Answer:
LICL as an Ionic compounds has covalent ability and they are soluble in polar solvent such as CH3COCH3 but they are insoluble in non-polar solvents. Due to their polarity, CH3COCH3 will decreases the electrostatic forces of attraction thereby resulting in free ions in aqueous solution.
Water is the known as a polar solvent that can dissolve an ionic compounds very easy and as a polar solvent, the arrangement of oxygen and hydrogen atoms in water is in bent shape.
Ionic compounds like LICL that is very polar is soluble in the polar solvent water.
Polar solvents like CH3COCH3 will dissolve polar and ionic solutes because of the attraction of the opposite charges on the solvent and solute particles.
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Explanation:
List the metals that form only one type of ion (that is, metals whose charge is invariant from one compound to another). What are the group numbers of these metals
Answers
this question is in reference to the formation and naming of ionic compounds. Specifically, they want you to give examples of three ionic compounds with a metal to nonmetal ratio of 2 to 1. That means we need to have two metal atoms to metal ions, which are typically cat ions for every one non metal atom or an ion. In order for this to occur, we need to have the metal with half the charge of the nonmetal or the non metal with double the charge of the metal. So an example might be something like sodium sulfide. Sodium has one valence electron. It can give up sulfur needs to valence electrons in order to achieve an octet. So we need to. Sodium seems to give up one electron each to total so that sulfide can achieve an octet. Another one might be potassium oxide. Similar scenario. We've got potassium giving up one valence electron oxygen requiring too. So we need to potassium to supply the to valence electrons that oxygen needs to achieve an octet and lithium. Also in Group one A and alkali metal wants to give up just one valence electron to achieve an octet well to achieve, I guess a duet to be more like helium, and so it gives up one. If we have two of them, then we can provide the to valence electrons that sulfur needs. So this is sodium sulfide, potassium oxide and lithium sulfide. Remember when we name Ionic compounds? We named the Cat Ion with the name of the element and the anti on with the name of the Element, but with the ending oven of ID, a suffix of ID because each one of the cat ions donated their valence electrons to the anti on so the an ion could achieve an octet. Then all of the's will have an octet of valence electrons. Sulfur had six sodium had one. There were two of them, so we have a total of eight.
The metals that can form only one type of ion are Li, Al, Ca, Ba, Rb, W,Na, Mg and Sr. They are called alkali metals.
Cobalt, Co is stable in both +2 and +3 oxidation state. So it can variable.
Lithium, Li only have +1 charge. So it is invariable from one compound to other.
Lead, Pb is variable as it has +2, +4 charge in which it is stable.
Pd has +2, +4 charge in which it is stable. So, It is variable.
Copper, Cu has +1, +2 charge. It is also variable. Potassium, K has only +1 charge. It is invariable. Aluminum, Al has only +3 charge. It is invariable.
Cesium, Cs is only stable in +1 charge. It is invariable. Molybdenum, Mo is stable in +4 and +6. It is variable. Calcium, Ca and Barium Ba are stable in +2 charge. It is invariable.
Rubidium, Rb is stable in +1 charge. It is invariable. Tungsten, W is stable in +6 charge. It is invariable. Iron, Fe is stable in +2, +3 charge. It is variable. Sodium, Na is stable in +1 charge. It is invariable. Mg and Sr are stable in +2 charge. It is invariable. Vanadium, V has +2, +3, +4, +5 charges. So, It is variable.
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The table shows the boiling points of fluorine, chlorine and bromine.
Element
Boiling point in °C
Fluorine
-186
Chlorine
-34
Bromine
+59
(c) Explain why the boiling points in the table are low.
Answers
Explanation:
the chemicals are group 7 elements and one of their characteristics is that the melting and boiling point increase progressively
Write the formula of the conjugate base of C6H5SH.
Answers
Answer:
C6H5S^-
Explanation:
This is because you are removing the hydrogen to make it a conjugate base.
The formula for conjugate base of C6H5SH is C6H5S⁻.
What is conjugate base?Conjugate base is defined as the substance which is formed when an acid liberate its protons.
The acid donate protons and the acid changes into base.
Conjugate acid is defined as the pair of compound that differs by its protons by gaining protons.
Conjugate acid and base are based in acid base theory.
Thus, the formula for conjugate base of C6H5SH is C6H5S⁻.
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Anatomy of the bone. The bone is made up of compact bone, spongy bone, and bone marrow. Compact bone makes up the outer layer of the bone. Spongy bone is found mostly at the ends of bones and contains red marrow. Bone marrow is found in the center of most bones and has many blood vessels. There are two types of bone marrow: red and yellow. Red marrow contains blood stem cells that can become red blood cells, white blood cells, or platelets. Yellow marrow is made mostly of fat
that means what a red bone marrow contains?
_______________________
(the one who gives the correct ans first is the brainliest)
Answers
Answer:
red bone marrow contains blood stem cells that can become red blood cells ,white blood cells ,or platelets
Explanation:
five differences between true solution and false solution
Answers
Answer:
k im silly frrr lol have a great day
How many aluminum atoms are there in 3.50 grams of Al2O3?
Answers
Answer:
Answer:
Aluminium atoms = 4.13 *10^22 aluminium atoms
Explanation:
Explanation:
Step 1: Data given
Mass of Al2O3 = 3.50 grams
Molar mass of Al2O3 = 101.96 g/mol
Number of Avogadro = 6.022 * 10^23 /mol
Step 2: Calculate moles Al2O3
Moles Al2O3 = mass Al2O3 / molar mass Al2O3
Moles Al2O3 = 3.50 grams / 101.96 g/mol
Moles Al2O3 = 0.0343 moles
Step 3: Calculate moles Aluminium
In 1 mol Al2O3 we have 2 moles Al
in 0.0343 moles Al2O3 we have 2*0.0343 = 0.0686 moles Al
Step 4: Calculate aluminium atoms
Aluminium atoms = moles aluminium * Number of Avogadro
Aluminium atoms = 0.0686 * 6.022 * 10^23
Aluminium atoms = 4.13 *10^22 aluminium atoms
Dirty water is a _____.
mixture
or
compound ?
Answers
Answer: mixture
Explanation: they are heterogeneous mixtures not homogeneous
It's Mixture
Reason:- Dirty water is a mixture of dirt and water. Mixture are made up of 2 or more different substance with different characteristics
Which statement about petroleum fractions is correct?
A. All petroleum fractions are used as fuels.
B. Gas oil is used to make bottled gas for heating.
C. Hydrocarbons in diesel have higher boiling points than hydrocarbons in
gasoline.
D. Molecules in kerosene are larger than molecules in fuel oil.
Answers
Answer: It is either C. or D.
Explanation: I did some reading about it and it talks about fuel but I know that it didn’t say all of them are used as fuels. maybe I’m wrong
Petroleum is composed of hydrocarbons of various chain length. Different products can be extracted from petroleum but all products cannot be used as fuel.
Hydrocarbons in diesel have higher boiling point than that of gasoline.
What is petroleum?Petroleum is a naturally occurring crude liquid mixture of hydrocarbons. Petroleum can be fractionated to different components such as gasoline, kerosene, diesel etc.
Each fraction vary in the number of carbons and hydrogens in it or called the difference in chain length. Kerosene contains 8-16 carbons where as gasoline and diesel have more carbons.
Not all products of petroleum fractionation can be used as fuel. Some of them with effective quality is taken as fuels.
The boiling point of hydrocarbons in diesel is greater (about 130-380 degree Celsius) than the hydrocarbons in gasoline which is having boiling point in he range 30-225 degree Celsius.
Therefore, the statement C is correct.
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hidrógeno
notacion electronica
Answers
Answer:
Hydrogen
Electronic notation
Explanation:
Read the following statement:
The amount of force acting on an object is equal to its mass times its acceleration.
Does the statement describe a scientific law?
No, because it is applicable to all cases in the natural world
Yes, because it is applicable to just a few cases in the natural world
No, because it describes the relationship between force and acceleration
Yes, because it describes how mass and acceleration affect force
Answers
Thermal energy is associated with _____.(1 point)
electric charge
particle motion
bond strength
substance volume
Answers
Answer:
see below
Explanation:
1. particle motion
2. The particles of a liquid can slide past one another.
3. the kinetic energy required to break forces between particles
4. increasing its temperature until it transitions from a solid to a liquid
5. A liquid becomes a gas.
[quizlet: captncrun]
Thermal energy is in the form of heat and light is always associated with the random motion of atoms and molecules. That form of kinetic energy is used to the rise in temperature.
The energy is released from the particles that are heated and collide with each other. This takes place by the particle motion.Hence the option B is correct.
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If acid comes in contact with your skin, why must you flush the area with plenty of cold water, rather than neutralizing the acid with a base?
Answers
Answer:
that would just create a bigger mess if you flush it with ice water it can reduce swelling and help dull your nerves
Explanation:
If acid comes in contact with your skin, because having an excessive amount of base can also be harmful. Acid is weakened and rendered ineffective by water.
What is acid?A chemical species known as an acid absorbs electrons and/or provides protons or hydrogen ions. When a hydrogen atom is bound to an acid, it can release (dissociate) and produce a cation as well as an anion in water. A substance's acidity and solution pH increase according to the amount of hydrogen ions it produces.
There are various definitions for acids. When someone uses the term "an acid," they typically mean an Arrhenius or Brnsted-Lowry acid. Often, a Lewis acid being referred to as a "Lewis acid." If acid comes in contact with your skin, because having an excessive amount of base can also be harmful. Acid is weakened and rendered ineffective by water.
Therefore, if acid comes in contact with your skin, because having an excessive amount of base can also be harmful. Acid is weakened and rendered ineffective by water.
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What gas was produced by the reaction of zinc and HCl? How did this gas behave in the presence of fire?
Answers
Answer:
The gas that was produced by the reaction of zinc and hydrochloric acid was Hydrogen gas and zinc chloride. In the presence of fire, hydrogen explodes with a popping sound. The popping sound put out the flame.
When Zn is reacts with HCl then generating tiny hydrogen bubbles as well as creating zinc chloride [tex]ZnCl_{2}[/tex] (zinc chloride).
What is hydrogen bubbles?A process known as the hydrogen bubble procedure electrolyzes conductive water containing acid / base to produce hydrogen bubbles.
What is [tex]ZnCl_{2}[/tex] (zinc chloride)[tex]ZnCl_{2}[/tex] (zinc chloride) will be formed by the reaction between the Zn (Zinc) and Cl (chlorine).
It can be written as:
[tex]Zn +Cl_{2}[/tex] → [tex]ZnCl_{2} +H_{2}[/tex].
Hence, [tex]ZnCl_{2}[/tex] (zinc chloride) and hydrogen gas will be formed during the reaction.
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