balance Cr2O3+Mg -->Cr + MgO
Balancing means there are equal amount of molecules on each side, both reactant and products. This is a method I like to do.
Under, I count how many molecules are in each side.
Cr2O3+Mg -->Cr + MgO
Cr: 2 1
O: 3 1
Mg: 1 1
Let's guess and make the number of oxygens equal on both sides.
Cr2O3+Mg -->Cr + 3MgO
Cr: 2 1
O: 3 3 EQUAL
Mg: 1 3
See what we did there? We multiplied the MgO on the products side by 3 so we can have 3 oxygens. Now let's multiply the Mg on the reactants by three so Mg AND O can be equal.
Cr2O3+3Mg -->Cr + 3 MgO
Cr: 2 1
O: 3 3 EQUAL
Mg: 3 3 EQUAL
Finally, we just need to multiply the loner Cr in the products side by two to make it equal for all elements.
Cr2O3+3Mg -->2Cr + 3 MgO
1.
The ___________ energy in a mechanical system is determined by adding the potential and kinetic energy together.
total
massive
2.
The initial ___________ energy is equal to zero because the starting point is set at zero height to make things easier.
kinetic
potential
3.
In the example, the final kinetic energy is determined to be ___________ because at the peak height, the ball instantaneously stops.
positive
zero
negative
4.
In this system, potential and kinetic energy are ________________ proportional.
inversely
directly
Answer:
1) total, 2) potential, 3) zero, 4) inversely.
Explanation:
1) The total energy in a mechanical system is determined by adding the potential and kinetic energy together.
2) The initial potential energy is equal to zero because the starting point is set at zero height to make things easier.
3) In the example, the final kinetic energy is determined to be zero because at the peak height, the ball instantaneously stops.
4) In this system, potential and kinetic energy are inversely proportional.
The system has an energy that can be conserved in the system, and when work is performed, the energy has been converted to working energy.
The following sentences can be completed as:
The total energy in a mechanical system is determined by adding the potential and kinetic energy together.Total energy = Potential energy + Kinetic energy
The initial Kinetic energy is equal to zero because the starting point is set at zero height to make things easier.In the example, the final kinetic energy is determined to be zero because, at the peak height, the ball instantaneously stops.In this system, potential and kinetic energy are inversely proportional.For more information about kinetic and potential energy, refer to the link:
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What other objects could be used to simulate
radioactive and nonradioactive nuclei? Check all
that apply.
blank slips of white paper
quarters
a computer that shows pictures of atoms on
screen
candy with letters on one side
paper clips
Answer:
b,c,d
Explanation:
on edg
Answer:
B, C, and D
Explanation:
i just did it on edge
A saturated solution of lead(II) nitrate was made at 50 °C using 100 g of water, and this was then allowed to cool to 30 °C. Predict what would happen as the solution cooled?
Answer: D) The solubility would decrease and some of the lead (II) nitrate would precipitate out.
What is the identity of the resulting atom
The identity of the resulting atom after a nuclear reaction, such as decay or fusion, is determined by the number of protons in the nucleus. The atomic number, which defines the element, is the total count of protons. Therefore, the resulting atom's identity is defined by its atomic number post-reaction.
Chemistry fundamentally revolves around the study of matter and the changes it undergoes. A critical component of understanding matter is knowing how to identify different elements. Elements are primarily defined by the number of protons in their atomic nuclei, a value known as the atomic number. When a nuclear reaction occurs, such as radioactive decay, one element can transform into another. To identify the resulting atom, one would determine the new atomic number - the count of protons in its nucleus after the reaction has occurred. This is crucial in nuclear chemistry and physics, as it allows scientists to predict the outcomes of such reactions and understand the changes in elemental identity.
In the space below, write down any initial ideas you may have about why the liquid oxygen machine is not working.
Answer:
It's not plugged in. A fuse is blown. Oxygen is no longer present because we killed all our trees. The pressure gauge is broken and all your Oxygen is gas because the gauge says you are at 30 atmospheres when you are actually at 1.5. The cooler is outdated and requires CFCs, which are now illegal. The cooler is too small to reduce the temperature of the quantity of oxygen you wish to liquefy. Your liquid oxygen machine is actually a liquid helium machine. The company that sold you your liquid oxygen machine was scamming you and now it looks really complex but in fact if you break it open with a sledgehammer, you will see that the inside is made completely of useless nonbouyant rubber duckies. Operator error.
Explanation:
All are entirely possible and would cause a liquid oxygen machine to be defected.
Possible reasons for the liquid oxygen machine not working include problems with pressure, the cooling system, and valves or pipes.
Explanation:There could be several reasons why the liquid oxygen machine is not working. One possibility is that there is a problem with the pressure inside the machine. If the pressure is too low or too high, it can prevent the liquid oxygen from being produced.
Another reason could be a fault in the cooling system. Liquid oxygen needs to be kept at very low temperatures in order to remain in its liquid state. If the cooling system is not functioning properly, the liquid oxygen may not be able to be produced.
Lastly, there could be an issue with the valves or pipes that are used to transport the liquid oxygen. If these components are damaged or not properly connected, it can prevent the flow of the liquid oxygen.
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Based on the weather map, what might the upcoming weather be like in Chicago?
1.Warm, dry, clear skies
2.Warm, humid, possible thunderstorms
3.Cold, dry, clear skies
4.Cool, humid, possible thunderstorms
Answer:
Warm, dry, clear skies
Explanation:
The sun is responsible for all weather variations that take place. because the sun is a massive sphere of heated gases and has a very high temperature. It is the earth's primary source of heat and light. Here the weather is Warm, dry, clear skies. The correct option is 1.
What is weather?The weather of a location refers to the average conditions of the atmosphere there in relation to variables like humidity, temperature, wind speed, rainfall, etc. Cloudy, sunny, wet, stormy, or clear weather are all possible. It is a characteristic of the natural process that keeps the atmosphere in a state of equilibrium.
Meteorologists record the weather every day, and these records are kept for a very long time. These records are used to determine the weather's pattern. The climate of a place is defined as its long-term average weather pattern.
Severe weather is defined as weather that is extreme or intense enough to result in damage to property or fatalities.
Thus the correct option is 1.
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Match the symbols with the element name.
1 Ag
zinc
2. Pb
silver
3. o
chlorine
ο
nitrogen
oxygen
ο
lead
Ο
carbon
7. Ar
argon
8. Zn
Answer:
Ag = silver
Pb = lead
O = oxygen
Ar= argon
Zn = zinc
Cl = chlorine
N = nitrogen
C = carbon
Explanation:
The symbol with the element name is Ag silver, Pb lead, O oxygen, Ar argon, Zn zinc, Cl chlorine, N nitrogen and C carbon.
What are elements?Elements are defined as a pure substance made up of only one sort of atom with the same number of protons in its nucleus.
It is also defined as a substance that cannot be broken down further by any chemical reaction.
There are basically three types of elements.
Metals - They are defined as a substance that has a glossy appearance when freshly manufactured, polished, or shattered and conducts electricity and heat reasonably effectively.Non metals - They are defined as natural materials that are structurally fragile and do not generate heat or electricity.Metalloids - They are defined as chemical elements with physical and chemical properties that sit in between metal and nonmetal.Thus, the symbol with the element name is Ag silver, Pb lead, O oxygen, Ar argon, Zn zinc, Cl chlorine, N nitrogen and C carbon.
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points)
Determine the molar mass of NaCl (the solute) in a 0.1M aqueous solution of NaCl
Answer:
58.443 g/mol
Explanation:
The molar mass of NaCl is the sum of the molar masses of the individual atoms:
Na: 22.989770 g/mol
Cl: 35.453 g/mol
The total molar mass is ...
NaCl: 58.443 g/mol
__
The molar mass does not depend on whether the material is in solution or in any other form.
Select the ion. HC 2H 3O 2, Mg, H +
Answer:
H+
Explanation:
H+ = hydronium ion
- Hope that helps! Please let me know if you need further explanation.
ASAP Ag2O(s) → 2Ag(s) + ½ O2(g) ΔH° = 31.05 kJ
Which statements concerning the reaction above are true?
(1) heat is released
(2) heat is absorbed
(3) reaction is exothermic
(4) reaction is endothermic
(5) products have higher enthalpy content than reactants
(6) reactants have higher enthalpy content than products
A) 1, 3, and 5
B) 1, 3, and 6
C) 2, 4, and 6
D) 2, 4, and 5
Answer: 2 4 5
Explanation:
1. What happens when you add buttermilk (an acid) to baking soda (a base) in a mixing bowl does the pH increases or decreases or neutral.
2. A scientist is looking for a solution that is neither acidic nor basic. Which pH would identify a solution as neither acidic nor basic?
3. How self-raising flour helps cake rise?
4. Why do bases make good household cleaners?
5. When you vomit, you feel a burning sensation in your mouth and throat. Why do you think this happens?
Answer:
1) acid + base = salt + water its neutralization reaction
2)A solution that is neither acidic nor basic is neutral and has a pH of 7. The pH scale, which ranges from 0 to 14, indicates how acidic or basic a substance is. A substance that has a pH below 7 is and acid and a substance with a pH above 7 is a base.
3)Self raising flour rises due to the baking powder inside.
Self raising flour is different from normal flour as it has baking powder mixed inside already. Baking powder is usually made up of a chemical called sodium carbonate, when mixed with water this will releases the gas carbon dioxide. So when you mix a cake together and pour it into a tin, the heat plus the water in the mixture will cause the baking powder to release small amounts of carbon dioxide which produces bubbles. These bubbles try to rise up and so the mixture starts to rise with all the tiny bubbles. The reason the air does not escape is because the heat from the oven is making the cake solid. Once is it solid the carbon dioxide slowly leaves the bread or cake, so don’t worry you’re not eating loads of carbon dioxide
4) They react/break down organic chemicals like oil/grease without attacking the metals that they are attached too which is better than acids which do react with metals as well
5) it is because when you vomit due to acidity in stomach
the harsh acid creates a burning sensation in the back of your throat and chest, and can also give you a sour or bitter taste in your throat and mouth
THANK YOU
PLS SUPPORT ME
AND I HAVE DONE SOME RESEARCH ON THE ANSWERS SO
IF THE ANSWER IS WRONG PLEASE FORGIVE ME
How many liters of O2 will form at STP if 22.5 g H2O2 react?
Answer: 7.41 L of O2
Explanation:
2H2O2(l) ----> 2H2O(l) + O2(g)
22.5 g H2O2 x __1 mol__ x __1 mol O2__ x __22.4 L__ = 7.41 L of O2
34.016 g 2 mol H2O2 1 mol O2
4. Определите молекулярную массу (г/моль) кислоты, участвовавшей
в реакции этерификации для образования жира с молекулярной массой
386 г/моль.Плиииииииииииз
To determine the molecular mass of the acid used in the esterification reaction, additional information about the alcohol involved or the identity of the acid is needed. Without these details, an accurate determination of the acid's molecular mass is impossible.
Explanation:To find the molecular mass of the acid used in the esterification reaction to create a fat with the molecular mass of 386 g/mol, further information is needed. This would typically include the molecular mass of the alcohol also involved in the reaction, or the identity of the acid or alcohol. The molecular mass of the acid or the alcohol could be deduced from the formula of the reaction itself:
Fat = Acid + Alcohol - Water
However, without knowing the molecular mass of the alcohol or the identity of the acid or alcohol, we cannot accurately determine the molecular mass of the acid alone.
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Calculate the molarity of 0.50 mol MgCl2 in 750 ml of solution.
a) 0.38 M
b) 0.67 M
c) 0.75 M
d) 0.95 M
Answer:
Option (b) 0.67 M
Explanation:
The following Data were obtained from the question:
Mole of MgCl2 = 0.5 mole
Volume of solution = 750mL
Molarity of MgCl2 =?
Next, we shall convert the volume given from mL to L. This is illustrated below:
1000mL = 1L
Therefore 750mL = 750/1000 = 0.75L
Now we can obtain the molarity of MgCl2 as follow:
Molarity is defined as the mole of solute per unit litre of the solution i.e
Molarity = mole /Volume
Molarity = 0.5/0.75
Molarity of MgCl2 = 0.67 M
During science lab, Carl notices that when he adds water to his solid sample of anhydrous copper
copper sulfate, CuSO4, his reaction vessel
becomes warm and a blue solution forms. Describe what is happening
es )))
Answer:
The dissociation of copper sulfate into ions is an exothermic chemical reaction that releases heat into the surroundings.
Explanation:
Some of the potential energy stored in the solid sample of anhydrous copper sulfate is released as heat as the sample dissolves and dissociates into ions in the water. This is due to the large lattice energy of the crystalline copper sulfate.
hope this helps
Which is an example of an instinct?
A spider spins web A child speaks Chinese.
A sea lion balances a ball on its nose.
A dog stays away from skunks.
Answer:
B
Explanation:
Answer is B
You welcome
What is the pH of a solution with [H+]=6.2x10-9 M?
Answer: 8.2
Explanation:
pH of a solution is - Log [ H+].
pH = - Log [ 6.2 x 10-9 M]
= 9 - 0.7924
pH = 8.24 approx 8.2
Some scientists believe that comets originate from the...
Answer:
Scientists believe that comets are the debris left from the solar nebula which condensed to form the Sun and planets in our solar system. Most comets are thought to originate in a huge cloud called the Oort Cloud. ... Comets follow a regular orbit around the Sun.
Hope this helps! :)
Explanation:
Answer:
In fact, if the estimated total mass of all asteroids was gathered into a single object, this object would be less than 1,500 kilometers across, less than half the diameter of our Moon. Kirkwood gaps: If you plot the radius of the orbits of the asteroids you do not get a smooth `bell-curve' shape.
Explanation:
1. What happens when you add buttermilk (an acid) to baking soda (a base) in a mixing bowl does the pH increases or decreases or neutral.
2. A scientist is looking for a solution that is neither acidic nor basic. Which pH would identify a solution as neither acidic nor basic?
3. How self-raising flour helps cake rise?
4. Why do bases make good household cleaners?
5. When you vomit, you feel a burning sensation in your mouth and throat. Why do you think this happens?
Answer:
Explanation:
1)This reaction is an acid base reaction. Baking soda is made up of sodium bicarbonate has it's PH above 7,while the Buttermilk contains some fatty acids with it's PH below 7, neutralization would occur when mixed together, and the pH of the mixture must be close to 7 which is neutral pH.
2) PH of 7(Neutral PH)
3)Self-raising flour has baking powder as one of its constituents. It also cotains cream of tartar, bicarbonate soda as well as calcium aluminium phosphate, the carbon dioxide from Bicarbonate of soda is released when reaction with acid takes place, then the Cream of tartar turns to tartaric acid when it is mosturized , then the reaction between them will produce bubbles of carbon dioxide in the cake, causing the cake to rise.
4)It makes a good household cleaner because it react with organic chemicals such as oil or grease then break them down like without attacking the metals that is attached to them.Bases contain particles called hydroxide ions. The higher the amount of hydroxide ions present in a base , the stronger it is.
5) The harsh acid or bike in the stomach creates a burning sensation in the back of your throat which irritate the food pipe line. Ifthe acid reflux is severe, it's reffered to as gastroesophageal reflux
For the reaction of nitrogen gas and hydrogen gas to make methane below, what stresses would shift the equilibrium to the left toward the reactants? N2(g) + 3 H2(g) ⇌ 2 NH3(g) + Energy
Answer:
1) Adding more NH₃
2) Raising the temperature of the reaction
Explanation:
To answer the question, we are to note that the reaction is a reversible reaction, hence to shift the equilibrium to the left we would alter the equilibrium conditions as follows;
1) Adding more of the product NH₃ to the reaction at equilibrium
Increasing the quantity of products will force the concentration of the reactant product combination at equilibrium to readjust forming more of the reactant, because, for example, at equilibrium we have one mole of N₂ combining with 3 moles of H₂ forming 2 moles of NH₃. If the NH₃ is increased to 4 moles then there will be more H₂ and N₂ formed to regain equilibrium
2) Increasing the reaction temperature
It is also observed that the reaction produces energy, that the the energy of the product is less than those of the reactant. Therefore, to shift the equilibrium to the left, that is towards the reactants, we have to increase the temperature of the reaction so that there will be enough energy for the formation of the higher energy reactants.
2.4 moles of NO, 2.4 moles of Oz, and 2.4 moles of H2O react
to form 2.0 moles of HNO3. What is the percent yield of this
reaction?
The idea here is that a reaction's percent yield tells you how many moles of a product will actually be produced by a chemical reaction for every
100
moles of this product that could theoretically be produced by the reaction.
In your case, the reaction is said to have a percent yield of
30
%
. This means that for every
100
moles of a product that the reaction could produce, you will only get
30
moles.
A student has a solution of 2.0 M MgSO4. What volume (in mL) of the original solution is needed to make 100 mL of 0.40 M MgSO4?
A) 20
B) 50
C) 200
D) 500
Rank the following in order of increasingly positive hydrogen charge: a) HClO2, HCl, CH4, H2O, HClO
Answer:
CH4<HClO2<HClO<H2O<HCl
Explanation:
In ranking the compounds on the basis of increasing positive charge of hydrogen, we must consider the relative oxidation numbers of the various elements in the compounds.
Methane contains a nonpolar covalent bond, HClO2 contains a chlorine atom in +3 oxidation state, HClO contains a chlorine atom in +1 oxidation state. The more the positive charge on the halogen atom the lesser the magnitude of positive charge on the hydrogen atom. Between water and HCl, chlorine is more electro negative hence HCl will contain a more positively charged hydrogen atom than water.
How does water change the shape of Earth's surface?
Answer:
Water moving across the earth in streams and rivers pushes along soil and breaks down pieces of rock in a process called erosion. The moving water carries away rock and soil from some areas and deposits them in other areas, creating new landforms or changing the course of a stream or river.
Explanation:
Answer:
Water shapes Earth’s surface by wearing away soil and rock and through the movement of glaciers. Weathering through the action of water and frost or ice also changes the shape of Earth’s surface.
Explanation:
An athlete can run 9 kilometers in 1 hour. If the athlete runs at that same average speed for 30 minutes, how far will the athlete travel? *
1 point
A 18 kilometers
B 9 kilometers
C 4.5 kilometers
D It travels right at an increasing speed
Answer
C
Explanation:
If the athlete can run 9 kilometers in one hour, and thirty minutes is half an hour, then you divided the distance the athlete can run(9 kilometers) by 2, getting 4.5 kilometers in 30 minutes. Hope this helped.
Nina ran into a rough patch of pavement, but she thought she could ride right over it. Instead, the skateboard stopped suddenly and Nina ended up on the ground (see Figure above). Explain what happened.
Nina fell off her skateboard because the rough patch of pavement increased friction significantly, making the skateboard come to an abrupt halt. This principle is attributable to the physics of forces and friction.
Explanation:What happened to Nina was due to the principle of physics, particularly in relation to forces and friction. When she encountered the rough patch of pavement, her skateboard wheel and the pavement started interacting. The irregularities on the rough pavement significantly increased friction, opposing the motion of the skateboard.
Normally, when Nina is skateboarding on smooth pavement, the wheel's contact with the ground is relatively small, thus minimizing friction. However, on rough terrain, the increased friction force can exceed the forward momentum and cause the skateboard to stop suddenly, resulting in Nina falling.
It is similar to how a ball rolling on a smooth surface will eventually stop due to frictional forces. In this case, the rough patch of pavement acted like a sudden increase in friction, arresting the skateboard's motion unexpectedly. It's also akin to a bullet being stopped by a board; the board exerts a force strong enough to overcome the bullet's kinetic energy.
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Which of the following sets of acids form the primary component of acid rain?
-Sulfuric acid, Phosphoric acid, Boric acid
-Carbonic acid, Hydrochloric acid, Acetic acid
-Nitric acid, Perchloric acid, Hydrofluoric acid
-Carbonic acid, Sulfuric acid, Nitric acid
Answer:
Linoleic acid
Explanation:
Carbonic acid, Sulfuric acid, and Nitric acid are the primary components of acid rain, all resulting from air pollution in the form of sulfur and nitrogen compounds respectively, reacting with water molecules in the atmosphere.
Explanation:The primary components of acid rain are Carbonic acid, Sulfuric acid, Nitric acid. Acid rain is a result of air pollution, specifically sulfur and nitrogen compounds released from burning fossil fuels, which react with the water molecules in the atmosphere to form acids.
These acids then fall to the ground in the form of precipitation, giving us what we know as 'acid rain'. Sulfuric acid is formed from sulfur dioxide, while nitric acid forms from nitrogen oxides. Carbonic acid is formed by the reaction of carbon dioxide with water.
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Which formula can be used to calculate the theoretical yield?
Actual yield + percent yield
Amount of reactants + amount of products
(Actual yield ÷ percent yield) × 100
(Amount of reactant ÷ amount of product) × 100
Answer:
Option C, (Actual yield ÷ percent yield) × 100
Explanation:
Theoretical yield is defined as the total amount of product formed for given reactants in a chemical reaction. It is an ideal case which assumes no exceptions or wastage.
The mathematical relation between the actual yield, percent yield and theoretical yield is as follows -
[tex]P.Y. = \frac{M_{A.Y.}}{M_{T.Y.}} * 100[/tex]
Where
P.Y. represents the percent yield a
M A.Y. represents the mass obtained from actual yield
M T.Y. represents the mass obtained from theoretical yield
Hence, if we rearrange the formula, we get -
[tex]M_{T.Y.} = \frac{M_{A.Y.}}{P.Y.} * 100[/tex]
Hence, option C is correct
Answer:
C
Explanation:
Just took the test :)
Which is a series circuit and a parallel circuit
Explanation:
A is a series circuit
B is parallel circuit
Answer:
A. series circuit
B. parallel circuit