Answer:
Answer below
Explanation:
Physical changes dont change the chemical makeup of an object. An example would be to tear a piece of paper. Tearing the paper doesnt change how the paper was made chemically
Chemical changes on the other hand do change the chemical makeup of an object. An example of a chemical change would be to bake a cake. The reason being that the chemical makeup of the cake batter is changed so that the actual cake is formed.
how many moles of O2 are needed to produce 3.95 moles of Fe2O3
Answer:
4Fe+3O2- 2Fe2O3
the ratio: 3:2
x:3.95
x=5.92 moles of O2
The most effective ways to increase the rate of a reaction are to
Answer:
Use a catalyst, use more reactants, have a larger reactant surface area, more pressure, higher temperature.
Explanation:
What is the expansion for the chemical symbol of tungsten?.
Balance the following reaction:
C5H8 + _____ O2 ________ CO2. + _______ H2O
How much heat (q) will be released by water, H2O, if 34 grams of C5H8 reacts? Hint: This is a stoichiometry problem, before it’s a thermochemistry problem.
Balanced one
2C_5H_8+13O_2—»10CO_2+8H_2OMoles of Pentyne
Given mass/Molarmass34/680.5molMoles of H_2O
8/2(0.5)4(0.5)2mol1mol releases 241.8KJ
2mol releases 241.8(2)=483.6KJ
Which shows an isomer of the molecule below?
The isomer of the molecule in the depicted image would be A.
What are isomers?Isomers are molecules with the same chemical formula but different arrangements of their component atoms. Isomers also have different properties.
The original molecule in the image has a triple bond with 4 carbon atoms. Thus, its isomers must also have a triple bond with 4 carbon atoms.
The only option with a triple bond and 4 carbon atoms in the image is option A.
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Why would solar power be the best energy option for our new high school?
Explain why!
Answer:
Energy costs are high for many school districts. Therefore, unlimited free power generated by the sun can deliver huge cost savings when compared to grid-generated power. With a modestly sized solar array, cost savings are alike modest.
Explanation:
Which equation shows a physical change?
A-Pb(NO3)2 (aq) + 2KI(aq) → 2KNO3(aq) + PbI2(s)
B-2H2O(l) → 2H2(g) + O2(g)
C-H2O(g) → H2O(s)
D-HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
Answer:
C
water has undergone a phase change and the composition of a substance was not changed
Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells?
gamma rays
visible light
infrared light
microwaves
Answer:
Gamma rays
Since they have high penetrating power.
Answer:
A
Explanation:
Which statement describes what happens when somebody slaps their hand on a wall?
Answer:
B. Wall applies equal reaction force on hand
Explanation:
This is newton's third law. You push something, that something pushes you back with same force. The direction is opposite, so if I push a wall, the wall pushes me back with same force just in opposite direction (so wall towards me). This is why option A is incorrect b/c it says force in same direction as wall. C and D talk about unequal force which is incorrect.
Answer:Wall applies equal reaction force on hand
Explanation:
19. For the reaction, 2S+ 30=2SO3, how many moles of so3 will be produced from 12.5 g 02 and excess S?
19. For the reaction, 2S+ 30=2SO3, how many moles of so3 will be produced from 12.5 g 02 and excess S?
:
For the reaction: 2S(s) + 3O2 -> 2SO2(g) How many moles of SO3 will be produced from 2.0 mol O2 and excess S?
Answer:
Explanation:
19. For the reaction, 2S+ 30=2SO3, how many moles of so3 will be produced from 12.5 g 02 and excess S?
seriously what do i put in the x and y table im stuck and need to move to the next assignment
Remember the relationship
P is indirectly proportional to VSo
The pairs are
(2,4)(1,8)(4,2)(12,2/3)(2/3,12)And so on
Which of the following is true of folded mountains, fault-block mountains, and volcanic mountains?
Form from the buildup of lava and ash
Form only at boundaries between two oceanic plates
Form only at boundaries between two continental plates
Form at both convergent and divergent plate boundaries
Answer:
Here are the following answers to the five questions:
(1) "Form only at boundaries between two continental plates."
(2) "A fault-block mountain"
(3) "Island arcs form when hot, fluid rock rises through thin spots in Earth's crust, whereas hotspot volcanoes form when two oceanic plate boundaries push against each other until subduction happens and the plates partially melt."
(4) "The fault plane runs from the top of the rock to the bottom of the rock at an angle greater than 45 degrees."
(5) "Segments of Earth's crust bent and doubled over, and moving wind and water gradually shaped the rock into gently sloping domes."
Explanation:
Which of the following happens to an acid when it reacts with another substance?
A. Receives hydrogen ion
B. It receives a hydroxide ion
C. It donates a hydroxide ion
D. It donates a hydrogen ion
When an acid reacts in a reaction, it donates hydrogen ion as the only positive ion.
What is an acid?According to Bronsted-Lowry's definition, an acid is a substance that donates hydrogen ions as the only positive ion in reactions.
Following this definition, it can be concluded that when an acid reacts with another substance, it donates one or more hydrogen ions.
A good example is shown in the equation below:
[tex]HCl + KOH --- > KCl + H_2O[/tex]
In the reaction above, HCl donated a hydrogen ion.
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Answer:
a
Explanation:
just took the quiz and this is correct.
Which compound could serve as a reactant in a neutralization reaction?.
Answer:
In this type of neutralization reaction, the acids and bases are the reactants, since they are the materials that will react to form a new solution. The products are water and salt since they have been created following the reaction.
Explanation:
Neutralization occurs when a strong acid and a strong base come together in a chemical reaction to form water and salt.
In chemistry, acids and bases are measured on the pH scale, which ranges from 0 to 14. Pure water sits in the middle, at a neutral 7. Anything below 7 is an acid, and anything above 7 is a base. Often, solutions are either too acidic or too basic, so a reaction must take place in order to achieve neutralization.
That neutralization leads to the formation of water and salt. In chemistry, salt doesn’t necessarily just mean table salt. It is also a broader term that categorizes the compound that is created in the reaction between an acid and a base.
The solubility of which substance is least affected by the temperature of the water
Answer:
solo esto se responderte
Explanation:
Algunos solutos (por ejemplo, cloruro de sodio (NaCl) en agua) exhiben una solubilidad bastante independiente de la temperatura. Unos pocos, como el sulfato de cerio (III) y el carbonato de litio, se vuelven menos solubles en agua a medida que aumenta la temperatura.
Predict and write the formulas for the two products of the reaction of aluminum metal al(s) with the copper(ii) chloride.
Answer:
Cu (s) and AlCl₃ (s)
Explanation:
This reaction can be classified as a single-displacement reaction, aka. a single-replacement reaction. These reactions involve one element swapping out another element in a compound. In this reaction, aluminum is taking the place of copper (ii) in the copper (ii) chloride compound. Aluminum takes the place of copper (ii) specifically because aluminum is more likely form a cation than anion. Copper (ii) serves as a cation in the compound.
Al (s) + CuCl₂ (s) --> Cu (s) + AlCl₃ (s)
The final products are copper (ii) metal and aluminum chloride. The metal of copper (ii) is produced instead of the cation in order to maintain the neutral charge balance of the reaction. The chorine has a subscript of 3 because aluminum usually forms cations of a +3 charge while chlorines form anions with a -1 charge.
The balanced equation is:
2 Al (s) + 3 CuCl₂ (s) --> 3 Cu (s) + 2 AlCl₃ (s)
explain how these concepts are related: species, population, and community
Answer:
Organisms that belong to the same species, form groups, and interact together in the same environment make the level of the population whereas a community has groups of different species living together in an environment. Species are the group of individuals that are genetically related to each other.
4. Who has the most sensitive taste buds?
adults
babies
teenagers
the elderly
Answer:
Taste bufs
Explanation:
May be teenager or adult is the most probable answer because teenager and adult are fully developed species of human so they can have most sensitive taste bud
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT
Which reactant controls the amount of product formed?.
Answer:
limiting reactant gives ................
Answer:
Limiting Reagent or Limiting Reactant
Explanation:
The limiting reagent of a reaction is the reactant that runs out first. Once it is completely consumed, the reaction stops.The limiting reagent is the only chemical that is used to calculate the theoretical yield. It is used up first. After that, any excess reagent will not be able to produce more products.And to assess which reactant is which, we must usually have quantities of each reagent in a chemical reaction...and of course we should write a stoichiometric equation that is balanced with respect to mass and charge in order to assess the stoichiometric equivalence.
We could examine for instance, the combustion of methane gas, the which MAY have cooked your dinner … its combustion reaction is as shown...
[tex]CH_4(g) + 2O_2(g) rarr CO_2(g) + 2H_2O(g) + Delta[/tex]
And here conditions of COMPLETE combustion pertain; there is DIOXYGEN in excess, AND methane is the limiting reagent. A [tex]10*g[/tex] mass of methane represents a molar quantity of …
[tex](10.0*g)/(16.01*g*mol^-1)=0.623*mol[/tex]
And with respect to dioxygen we thus require...
[tex]0.623*mol*32.00*g*mol^-1=40*g[/tex]
...but this quantity (AND MORE) is available from the atmosphere....and the methane was the limiting reagent....
find the molarity of 4.9 g of h2so4 in 400 ml solution
The molarity of a solution that contains 4.9 g of [tex]H_2SO_4[/tex] in 400 ml of solution would be 0.12465 M
Define molarity of a solution.
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
Mathematically,
[tex]Molality = \frac{Moles \;solute}{olume \;of \;solution \;in \;litre}[/tex]
Mole of 4.9 g [tex]H_2SO_4[/tex]
= [tex]\frac{mass}{molar \;mass}[/tex]
= [tex]\frac{4.9 g}{98.08}[/tex]
= 0.0499
[tex]Molality = \frac{Moles \;solute}{ olume \;of \;solution \;in \;litre}[/tex]
[tex]Molality = \frac{ 0.0499}{0.4}[/tex]
= 0.12465 M
Hence, the molarity of a solution that contains 4.9 g of [tex]H_2SO_4[/tex] in 400 ml of solution would be 0.12465 M.
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Water’s property of surface tension is due to _____.
A. capillary action
B. solubility
C. cohesion
D. adhesion
E. All of the above
Answer:
C. cohesion
Explanation:
The cohesive force between liquid molecules are responsible for the phenomenon known as surface tension
Part A The first step to engineering is to define the problem. Write down the problem the students have to solve, and describe the challenges they will face when coming up with a solution.
WILL MARK BRAINLIEST!!
Answer:
Engineering is all about solving problems using math, science, and technical knowledge. And engineers have solved a lot of problems in the world by designing and building various technologies. We have everything from machines that can breathe for you in hospitals to suspension bridges to computers we use every day. All of these things were once designed by engineers using the engineering design process.
Explanation:
Answer:
Students will have to use their brains to solve problems and challenges they will face to find a solution to cleaning up oil spills. Students will face failures after completing their solution, lots of research, and problems during the making of their solutions. What will work? What won't?
Explanation:
Hope this helps!
Which of the following statements is true? Select one: a. A solution is a pure substance. b. A solution is a mixture. c. The solvent is dissolved in the solute. d. A solution has the same properties as a colloid.
Answer:
B
Explanation:
find out about the irish scientist, Robert Boyle and highlight his contributions to scientific concepts and ideas
Answer:
Known for his law of gases, Boyle was a 17th-century pioneer of modern chemistry. Every general-chemistry student learns of Robert Boyle (1627–1691) as the person who discovered that the volume of a gas decreases with increasing pressure and vice versa—the famous Boyle's law.
Anders Celsius made the __________
discovery of atoms
barometer
Periodic Table of the Elements
Centigrade thermometer
Anders Celsius made the centigrade thermometer.
A 115.0-g sample of oxygen was produced by heating 400.0 g of potassium chlorate. 2kclo3 right arrow. 2kci 3o2 what is the percent yield of oxygen in this chemical reaction? use percent yield equals startfraction actual yield over theoretical yield endfraction times 100.. 69.63% 73.40% 90.82% 136.2%
The percentage yield of oxygen obtained from the reaction, given that 400 g of potassium chlorate was heated is 73.4%
Balanced equation2KClO₃ —> 2KCl + 3O₂
Molar mass of KClO₃ = 122.5 g/mole
Mass of KClO₃ from the balanced equation = 2 × 122.5 = 245 g
Molar mass of O₂ = 32 g/mole
Mass of O₂ from the balanced equation = 3 × 32 = 96 g
SUMMARY
From the balanced equation above,
245 g of KClO₃ decomposed to produce 96 g of O₂
How to determine the theoretical yieldFrom the balanced equation above,
245 g of KClO₃ decomposed to produce 96 g of O₂
Therefore,
400 g of KClO₃ will decompose to produce = (400 × 96) / 245 = 156.7 g of O₂
How to determine the percentage yield Actual yield of O₂ = 115 gTheoretical yield of O₂ = 156.7 gPercentage yield =?Percentage yield = (Actual /Theoretical) × 100
Percentage yield = (115 / 156.7) × 100
Percentage yield = 73.4%
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Answer:
B. 73.40%
Explanation:
I AM JUST HIM
Describe the problem you have chosen to investigate. Plan your investigation and write out the steps in your procedure. Include a sketch of your set up. Explain how this procedure and set-up will help you investigate the problem.
Answer:
Answer both asap for brainliest
Carry out your experiment. Present evidence that you have carried out the experiment below. You may upload photos as evidence. Record your data in a chart. Be sure you have starting data and several data points. Analyze your results. You may want to present your data as a graph. Did the investigation you planned determine the relationships among temperature, the energy transferred, the type of matter, the mass, and the change in the average kinetic energy of the particles as measured by the temperature of the sample? How do you know? Use complete sentences and paragraph form for your analysis.
Answer:
Six step guide to help you solve problems
Step 1: Identify and define the problem. State the problem as clearly as possible. ...
Step 2: Generate possible solutions. ...
Step 3: Evaluate alternatives. ...
Step 4: Decide on a solution. ...
Step 5: Implement the solution. ...
Step 6: Evaluate the outcome
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Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest halogen and is a volatile red-brown liquid at room temperature that evaporates readily to form a similarly coloured vapour.
Answer:
Bromine is a nonmetal in group 7 or group 17, known as the halogens. It has 7 valence electrons.
So the correct answer is "nonmetal, 7 valence electrons"
Please HELP
Part 1. A lightly inflated balloon is placed in a freezer. Explain the change to the size of the balloon based on the kinetic molecular theory
Part 2. What would most likely happen to the balloon if it was instead kept outside in the sun for some time? Explain your answer based on the kinetic molecular theory
In both cases, assume the balloon is tied tight enough so that air does not escape. (10 points)
The three macroscopic properties of a gas in terms of the microscopic nature of atoms and the molecules making up the gas is explained by the kinetic theory of gases. The macroscopic properties like pressure, volume and temperature are used to study a gas.
What is kinetic theory of gas?The kinetic theory of gases is a theoretical model which describes the molecular composition of the gas in terms of a large number of submicroscopic particles which include atoms and molecules. Gas is a combination of large number of atoms or molecules.
The kinetic theory of gases considers that the atoms or molecules of a gas are constantly moving point masses which contain a huge inter-particle distance and may undergo perfect elastic collisions.
1. Since the particles are in motion, the average kinetic energy is proportional to the temperature of the gas. So when the inflated balloon is placed in a freezer, the balloon shrinks due to decrease in temperature.
2. When balloon is kept outside in the sun, it will burst due to expansion of gases.
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I NEED HELP ASAP!!!!!!!!!!!
WITHIN THE HOUR
Thanks
Answer:
C
Explanation:
Actually, arranged to the size of smallest to least atom radius size = C
Atomic sizes generally get smaller as you go from L to R across a row of the periodic table.