Fe +O2 =Fe2O3 is correct !
There is always some between any surfaces that are in contact with each other
Answer:
Friction that is the answer pls brainlist me
A chemist needs 225 mL of 2. 4 M HCl. What volume of 12 M HCl must be mixed with water to form this solution?.
Basedbon dilution formula, the volume of 12 M HCl required is 45 mL.
What is dilution?Dilution is the process of preparing a less concentrated solution from a more concentrated solution.
The dilution formula is as follows:
C1V1 = C2V2From the given data:
C2 = 2.4 M
V2 = 2.25 mL
C2 = 12 M
V1 = ?
V1 = C2V2/C1
V1 = 2.4 × 225/12
V2 = 45 mL
Therefore, the volume of 12 M HCl required is 45 mL.
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Use the equation to answer the question.
H2O(l) + heat ⇄ H2O(g)
A sample of water is at equilibrium at 100°C. Which statement best describes what will happen if liquid water is added to the system?
-More liquid water molecules will change to water vapor until a new equilibrium is reached.
-All of the liquid water molecules that are added will become water vapor.
-More water vapor molecules will change to liquid water until a new equilibrium is reached.
-All of the liquid water molecules that are added will remain liquid water.
I need help on this quick check ASAP!
In the system at equilibrium liquid water-water vapor, if liquid water is added to the system, more liquid water molecules will change to water vapor until a new equilibrium is reached.
How can the equilibrium be affected?If a constraint (such as a change in pressure, temperature, or concentration of a reactant) is applied to a system in equilibrium, the equilibrium will shift so as to tend to counteract the effect of the constraint.
Let's consider the following system at equilibrium.
H₂O(l) + heat ⇄ H₂O(g)
Which statement best describes what will happen if liquid water is added to the system?
More liquid water molecules will change to water vapor until a new equilibrium is reached. Yes. This will happen to counteract the excess of liquid water.All of the liquid water molecules that are added will become water vapor. No. Some liquid molecules will change to vapor to attain a new equilibrium.More water vapor molecules will change to liquid water until a new equilibrium is reached. No. The change will happen in the inverse sense.All of the liquid water molecules that are added will remain liquid water. No. Some liquid molecules will change to vapor to attain a new equilibrium.In the system at equilibrium liquid water-water vapor, if liquid water is added to the system, more liquid water molecules will change to water vapor until a new equilibrium is reached.
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Answer:
More liquid water molecules will change to water vapor until a new equilibrium is reached. Yes. This will happen to counteract the excess of liquid water.
All of the liquid water molecules that are added will become water vapor. No. Some liquid molecules will change to vapor to attain a new equilibrium.
More water vapor molecules will change to liquid water until a new equilibrium is reached. No. The change will happen in the inverse sense.
All of the liquid water molecules that are added will remain liquid water. No. Some liquid molecules will change to vapor to attain a new equilibrium.
Explanation:
What is the molecule that enters the citric acid cycle.
Answer:
Carbs can be broken down into glucose, the first molecule used during glycolysis. Similarly, proteins can be broken down into their basic parts to form acetyl CoA, the molecule that enters the citric acid cycle.
Which phrase defines bond energy? (1 point)
energy output when product bonds form
energy required to break a chemical bond
energy stored in chemical bonds
energy input needed to break reactant bonds
The phrase that defines bond energy is the energy required to break a chemical bond.
WHAT IS BOND ENERGY?Bond energy is amount of energy needed to break the atoms involved in a chemical bond into free atoms.
The bond energy of each molecule varies with the type of bond in the molecule. Stronger bonds require a higher bond energy and vice versa.
Therefore, the phrase that defines bond energy is the energy required to break a chemical bond.
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Answer:
D. Energy input needed to break bonds of reactants.
Explanation:
Activation energy is the minimum amount of energy required to initiate a chemical reaction by breaking the bonds of the reactants. It is the energy needed to reach the transition state, where the reaction can proceed, and new chemical bonds can be formed to create the products. The activation energy is the energy barrier that must be overcome for a reaction to occur.
Once the reactants have enough energy to overcome the activation energy, the reaction proceeds spontaneously, and energy is released when new bonds form in the products.
PS. I took the quick check.
solve this questions please
Ethane I think because it is colourless ,odorless and flammable gas
Answer:
i think ethane
Explanation:
because it is flameless gas
A collection of 6. 25×1018 electrons has the charge of.
Answer:
Explanation:
1)The charge of one electron is given by
1 e = - 1.6 * 10-19 C
Then – 1 C = 1 e / ( 1.6 * 10-19 )
= 6.25 * 1018 e
So one-coulomb charge has 6.25 * 1018 electrons
2)Let q1 and q2 be two charges separated by a distance r
Then q1 = - 40 µC = - 40 * 10-6 C
And q2 = 108 µC = 108 * 10-6 C
The collection of 6.25 × 10¹⁸ electrons has a charge of approximately 0.100125 coulombs.
Let's break down the calculation step by step;
Charge of an Electron: The charge of a single electron is approximately 1.602 × 10⁻¹⁹ coulombs. This value represents the fundamental charge carried by an electron.
Number of Electrons: You have a collection of 6.25 × 10¹⁸ electrons. This number tells us how many electrons are present in the collection.
Calculating Total Charge: To find the total charge of the collection of electrons, we need to multiply the number of electrons by the charge of each electron:
Total charge = Number of electrons × Charge of each electron
Total charge = 6.25 × 10¹⁸ electrons x 1.602 × 10⁻¹⁹ C/electron
Calculating the Product: Multiply the numerical values and add the exponents:
Total charge = 1.00125 x 10⁻¹ C.
Final Result: The calculated total charge is approximately 0.100125 coulombs
So, the collection of 6.25 × 10¹⁸ electrons has a charge of approximately 0.100125 coulombs. This means that the combined effect of the individual charges of the electrons in the collection results in an overall charge of 0.100125 coulombs.
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#SPJ3
a named metal or non metal tent pole
Answer:
non metal, it is made out of aluminum
Explanation:
Warm air has a natural tendency to sink, independent of any outside force.
true or false
Answer:
false
Explanation:
warm air rises
hope this helps love
Answer:
i think that False would be the correct answer
Explanation:
so so so sorry if this is wrong
define unit cell and explain why the unit cell will always crystallize from solution or break into the same shape
Answer:The structure of solids can be described as if they were three-dimensional analogs of a piece of wallpaper. Wallpaper has a regular repeating design that extends from one edge to the other. Crystals have a similar repeating design, but in this case the design extends in three dimensions from one edge of the solid to the other.
We can unambiguously describe a piece of wallpaper by specifying the size, shape, and contents of the simplest repeating unit in the design. We can describe a three-dimensional crystal by specifying the size, shape, and contents of the simplest repeating unit and the way these repeating units stack to form the crystal.
The simplest repeating unit in a crystal is called a unit cell. Each unit cell is defined in terms of lattice points--the points in space about which the particles are free to vibrate in a crystal.
You are investigating the resistance in a piece of wire. You are using the Vernier calipers below to measure the diameter of a piece of wire. What is the diameter of the wire to 2 decimal places?
The reading on the vernier caliper is determined by adding main scale and vernier scale reading.
How to measure the diameter of a piece wire
The diameter of a piece of wire can be measured using Vernier caliper.
The following steps can be used to measure the diameter of the Vernier caliper;
Take the reading on the main scaleTake the reading on the vernierAdd the reading on both scales togetherThus, the reading on the vernier caliper is determined by adding main scale and vernier scale reading.
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7moleNaCl
x 6.02E23moleculeNaCl
1moleNaCl
Answer:go molecule you some b1tc1es
Explanation:
Which of the following statements is true?
plants store excess energy in lipid molecules
sugar and starches are energy-poor
starches form sugar molecules
sugar molecules form starches
PLEASE ANSWER CORRECTLY FOR 10 POINTS
Answer:
it either plant store excess or sugar and starches I'll double check to see which one is correct
What is the relationship between specific heat and temperature change of a substance? How are they related to one another?
Answer:
Heat transfer is related to temperature change.
Explanation:
5
Select the correct answer.
If a stone dropped into a well reaches the water's surface after 3.0 seconds, how far did the stone drop before hitting the water?
ОА
1.4 meters
OB.
44 meters
Ос.
49 meters
OD
54.2 meters
Reset
Next
on samantium All riachte nennund
mentum com/assessments delivery
Answer:
s= 0.5 at^2
0.5 x 9.81 x 3^2 = 44m
Explanation:
OB.
44 meters
11 Jamila and Ahmed investigate displacement reactions
They put drops of different solutions into the dimples of a spotting tile.
They then add metals to each solution
The diagram shows their experiment.
zinc magnesium copper
metal metal metal
iron
metal
dimple
zinc nitrate
solution
♡
magnesium nitrate
solution
♡
» 2
Кеу
copper nitrate
solution
empty dimple
2
iron nitrate
solution
dimple with
metal and solution
spotting til
(a) Jamila and Ahmed look to see if a reaction takes place.
Suggest what they might see if a reaction takes place.
Based on the activity series of metals, it can be observed that Magnesium being most reactive is not dispalaced by any metal from it's solution whereas copper being the least reactive is displaced by all the metals from it's solution.
What is the activity series of metals?The activity series of metals is an arrangement of metals based on their reactivities, from the most reactive to the least reactive.
Based on the activity series of metals, the following will be observed:
Zinc nitrate solution + magnesium metal = Magnesium dissolves and zinc metal is obtained
Zinc nitrate solution + Copper metal = No reaction
Zinc nitrate solution + Iron metal = no reaction
Magnesium nitrate solution + Zinc metal = No reaction
Magnesium nitrate solution + copper metal = No reaction
Magnesium nitrate solution + Iron metal = No reaction
Copper nitrate solution + Zinc metal = Zinc metal dissolves and copper metal is produced
Copper nitrate solution + Magnesium metal = Magnesium dissolves and copper metal is produced
Copper nitrate solution + Iron metal = Iron metal dissolves and copper metal is produced
Iron nitrate solution + Zinc metal = Zinc metal dissolves and iron metal is obtained
Iron nitrate solution + Magnesium metal =Magnesium metal dissolves and iron metal is obtained
Iron nitrate solution + Copper metal = No reaction
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Lab: Kinetic Energy Assignment: Lab Report
Answer:
Explanation:
In this lab, two pieces of rock, one big one small, are dropped from the same height onto mud. The hole each rock made is measured for its depth. Later, one piece of rock is dropped from different heights and hole made measured. The lab shows relationship between mass, height and kinetic energy.
Answer:
I will take photos.
Sorry I was late btw
Explanation:
There are my answers
Do you have evidence from the lab that your calorimeter was not a perfect insulator? Assuming that heat was lost from the calorimeter, describe specifically how that would impact the data you recorded and then chase that change through the calculations to show how the error would impact the calculated enthalpy change for a particular reaction.
In the past, we have done this lab with roughly 50 mL each of each reactant solution, instead of 25 mL. Yet the Δ T determined experimentally were roughly the same. Explain why that is.
Each student will have slightly different volumes of reactants for each reaction. Yet the results obtained for ΔH1, ΔH2, and ΔH3 should be quite similar and would in fact be quite similar for any range of reactants combined within 25-50 mL, provided that each is accurately measured. Explain why this is the case.
A student misreads the volume of one of the solutions as 25.0 mL when in fact it was 35.0 mL. Step through the quantitative consequences of this error on the heat generated, the Δ T observed, the q calculated, and the Δ H calculated. (Clarification: Both solutions “should” be 25.0 mL or something close, and one of the volumes is accidentally 35.0 mL)
A student pours the reaction solutions into a still wet Styrofoam cup. Step through the quantitative consequences of this error on the heat generated, the Δ T observed, the q calculated, and the Δ H calculated.
Based on the law of conservation of heat;
Heat losses in a calorimeter will lower the value of enthalpy change, ΔH, for a particular reaction.An error in the volume of one of the reacting solutions will increase the heat generated, the ΔT observed, the q calculated, and the calculated ΔH.Using a wet Styrofoam cup will lower the heat generated, the ΔT observed, the q calculated, and the calculated ΔH.What is a calorimeter?A calorimeter is a laboratory apparatus used to measure heat changes that occur in a reaction.
A calorimeter works on the principle of conservation of heat which can be stated as;
Heat lost by hotter body = Heat gained by colder body.The formula for calculating quantity of heat, q is given as;
q = mcθwhere
m is mass of substancec is heat capacity of substanceθ is temperature changeHeat losses in a calorimeter will lower the value of enthalpy change, ΔH, for a particular reaction.
Error in the volume of substances used will affect the value of the heat generated, the ΔT observed, the q calculated, and the Δ H calculated as follows:
the heat generated will increasethe ΔT observed will increasethe value of q will increasethe value of ΔH will increaseIf the calorimeter used, (Styrofoam cup) is wet when used, the volume of the liquid to be heated will be higher. Therefore, the heat generated, the ΔT observed, the q calculated, and the calculated ΔH will be affected as follows:
the heat generated will decreaseΔT observed will be lowerthe value of q will decreasethe value of ΔH will increaseLearn more about calorimeter at: https://brainly.com/question/1407669
Elements are made up of one type of atom. Compounds are particles that have more than one atom joined together. They can be ........ or ......
Answer:
metal or non metal
Explanation:
this is the answer
why is chemistry a thing
Answer:
It's a very good subject!
In honor of the scientist who worked on the mole concept,6.02x10^23 is also called?
Answer:
Avogadro's Number
Explanation:
6.02 x 10²³ is the number of units it 1 mole.
6.02 x 10 ²³ is known as Avogadro's number
Which term is defined as the change from liquid water to water vapor?.
evaporation is the process of liquid water changing to water vapor
Budding is an example of what type of reproduction?
A. Internal
B. external
C. ase x ual
D. se x ual
Answered within 5 minutes will get brainliest and follow.
Answer:
C
Explanation:
aseKual reproduction
Budding is a form of aseKual reproduction that results from the outgrowth of a part of a cell or body region leading to a separation from the original organism into two individuals
SOMEONE HELP ME PLEASE
low kinetic energy
high kinetic energy
Answer:
High kinetic energy.
Explanation:
If an object has a high temperature, that means the atoms of the object have a high kinetic energy. If an object, however, has a low temperature, that means the atoms of the object have a low kinetic energy.
5.Write the seasons in order starting with fall:
Angelique wanted to find out what shampoo made her hair the shiniest. Everyday she washed her hair with different shampoos and then rated how shiny her hair was, on a scale of 1-10. She used Pantene, Herbal Essences, and L’Oreal
Answer:
indepndent v - a variable whose variation does not depend on another
dependent v- a variable that depends on the value of another
control - does not revive the treatment in an experiment
constant- can not be changed
Explanation:
The temperature of a freezer started at 18şc. After cooling for a few hours, the freezer had a temperature of –12şc. What is the difference between the new, colder temperature and the original temperature?.
A 5. 0 L vessel has a total pressure of 5. 0 atm. The partial pressure of the gases in the vessel are 1. 2 atm N2 , 2. 0 atm F2 , and 1. 0 atm H2 at 273 K. What is the partial pressure of the remaining gas that was not measured?.
The partial pressure of the mixture is equal to the sum of the individual pressure.The partial pressure of the remaining gas measured will be 0.8 atm.
What is partial pressure?The partial pressure of the mixture is equal to the sum of the individual pressure of the gases present in ther mixture.
The given date in the problemis
Total pressure of the mixture=P
P₁ is the partial pressure of gas 1 (N₂) =1.2 atm
P₂ is the partial pressure of gas 2(F₂)= 2.0 atm
P₃ is the partial pressure of the gas 3(H₂)=1.0 atm
P₄ Is the partial pressure of the gas 4=?
From the defination
P=P₁ +P₂ +P₃+P₄
5=1.2+2.0+1.0+P₄
P₄=0.8 atm
Hence the partial pressure of the remaining gas that was not measured will be 0.8 atm.
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convert 5 mole(s) of Xe into molecules
Answer:
5 mol Xe × 6.02×10^23
------------ ----------------
1 1 mol Xe
3.01x10^24
I would calculate on your calculator to make sure
What happens to particles during
changes of state between solids,
liquids, and gases?