Answers
Answer:
3
Explanation:
the answer is 3 because it is 3 for the o2 so 3 you have to pay more attention for the small ditails
Related Questions
At what minimal temperature is the following reaction, the reduction of magnetite by graphite to elemental iron, spontaneous?
Fe3O4(s)+2C(s,graphite)→2CO2(g)+3Fe(s)
Answers
The values of enthalpy change, entropy change and temperature all determine the spontenity of a reaction.
What is a sponteanous reaction?A sponteanous reaction is one which has the change in free energy as negative. We know that ΔG = ΔH - TΔS. The spontenity of a reaction depends on;
i. enthalpy change
ii. entropy change
iii. temperature
Since the values in the qestion are not given, the question is incomplete and we can not obtain a numerical value in order to decide the sponteanity of the reaction.
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The microscopes used today are just like the ones used by Leeuwenhoek and Hooke. True or false
Answers
Answer:
False
Explanation:
While we do know that A. Leeuwenhoek used a simple microscope that consisted of only 1 lens, Hooke used a compound microscope. Although, after trying a compound microscope, Hooke found out that it strained his eyes and continued to use a simple microscope for his Micrographia.
Thus, we can say that the (compound) microscopes used today are different than the (simple) microscope used by Hooke and Leeuwenhoek.
what is the Acid name for HArO3
Answers
NO LINKS PLEASE! Why does dye dropped into a cup of water eventually spread throughout the water?
A. The water has lattice vectors.
B. The water undergoes a phase transition.
C. The water particles and dye particles exhibit Brownian motion.
D. The water exerts pressure on the container.
Answers
Answer:
C
Explanation:
okay, you need to look at the structures of the particles of matter in the solid, liquid and gas.
particles in a solid are in fixed positions, where they can only vibrate in those positions ( take a look at ice, or rather, a brick)liquids have very small or rather, no spaces between them, but they can slide or rub against each other, like people in a really tight crowd I guessgas particles have very large spaces between them and they move randomly. these exibit what's called brownian motion.since water particles (and all other liquid particles) have negligible spacings and limited movement, that allows the dye particles to move from a region of high concentration to that of a low concentration. the aim for this is for the mixture/solution to reach an equilibrium, that is the mixture must get to a point where all regions have the same concentration of the dye.you can refer to your coursebooks :)
correct where wrong please:)
Oxygen gas occupies a volume of 95 ml at 305 k. what volume will it occupy at 550 k?
Answers
The new volume of the oxgen gas as the temperature is increased is 171.3ml.
Given the data in the question;
Initial olume of oxygen gas; [tex]V_1 = 95ml = 0.095L[/tex]Intial temperature; [tex]T_1 = 305K[/tex]Final temperature; [tex]T_2 = 550K[/tex]Final volume of oxygen gas; [tex]V_2 = \ ?[/tex]Charles's lawCharles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
To determine the new volume of the oxgen gas as the temperature is increased, we substitute our given values into the expression above.
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}\\ \\ \frac{0.095L}{305K} = \frac{V_2}{550K}\\\\V_2 * 305K = 0.095L * 550K\\\\V_2 * 305K = 52.25LK\\\\V_2 = \frac{52.25LK}{305K} \\\\V_2 = 0.1713L\\\\V_2 = 171.3ml[/tex]
Therefore, the new volume of the oxgen gas as the temperature is increased is 171.3ml.
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Which of the following ionic compounds has a transition metal in it?
a. KOH
b. Cs2S
c. CuSO4
d. MgCl2
Answers
Considering that copper occupies Group 11, the ionic compound with a transition metal in it is c. CuSO₄.
What is a transition metal?A transition metal is any of the set of metallic elements occupying a central block (Groups 3–12) in the periodic table. The differential electron occupies a d subshell.
Which of the following ionic compounds has a transition metal in it?
a. KOH. No, K occupies Group 1.b. Cs₂S. No, Cs occupies Group 1.c. CuSO₄. Yes, Cu occupies Group 11.d. MgCl₂. No, Mg occupies Group 2.The ionic compound with a transition metal in it is c. CuSO₄.
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how do you find the oxidation numbers for H3PO4
Answers
Explain why the available amount of water per person differs between countries
Answers
Answer:
because in the different countries it is distributed unevenly.
Explanation:
hope this helps
what challenges arise when nuclear material is removed from a power plant?
Answers
Answer:
it destroy the surrounding area
HELP PLS DUE TODAY
Biotechnology Activity
Now that you are more familiar with the benefits, risks, and impacts of biotechnology, it is time for you to take a stand! Your task is to choose one of the following types of biotechnology: genetic engineering, cloning, or artificial selection.
You will then write a one- to two-paragraph summary describing your chosen type of biotechnology. You will then need to argue for either the benefits or the risks of your chosen type. Your arguments should present your position, and then give the evidence that led you to this position. Be sure to include the following in your argument:
a description of your chosen type of biotechnology (genetic engineering, cloning, or artificial section)
one benefit or one risk for the individual (based on whether you are for or against it)
one benefit or one risk for society (based on whether you are for or against it)
one benefit or one risk for the environment (based on whether you are for or against it)
A picture (you may hand draw, take photos in nature, or use stock images)
Answers
Answer: Ok
Explanation: Explanation:Using recombinant DNA technology to modify an organism's DNA to achieve desirable traits is called genetic engineering. Addition of foreign DNA in the form of recombinant DNA vectors that are generated by molecular cloning is the most common method of genetic engineering.
Check all reasons why a book was used.
it increased pressure on the gas.
it supported additional weights.
it balanced the syringe.
Answers
We can confirm that for the experiments regarding Boyle's law, the book was used to increase pressure on the gas and add additional weight.
Why is the book used in these experiments?The book is used for the reasons described in options 1 and 2 of the question. The book supports additional weights on the container, meaning that through these added weights we can increase the pressure being applied to the gas and see how said pressure affects the volume of a gas.
Therefore, we can confirm that the book was used to increase pressure on the gas and add additional weight.
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Answer: A, B
Explanation: edge2023
Select all that apply.
Which items are properties of acids?
soapy
sour
sweet
sharp
possible burns
for 10 points
Answers
Answer:
Sour and Possible Burns
Explanation:
Bases are soapy, not acids.
All acids are sour to taste.
Neither bases nor acids are sweet.
Sharp is a physical trait for things such as knives, not acidic liquids.
Acids can cause burns if handled incorrectly.
PLEASE HELP!!!! WILL MARK BRAINLIEST! A balloon is filled with 257.88 L of gas at STP. When the balloon is cooled to -20.5°C, and the pressure decreased to .40 atm, what will the volume of the balloon be?
Answers
Answer:
3.97 psi
Explanation:
The new pressure can be found by using the formula for Boyle's law which is
P1 V1 = P2 V2
Work out the specific heat capacity of each metal from the data given:
Gold- the temperature of 2.00g of gold is raised by 11.7°C when 3.00J of energy is supplied
Answers
Answer:
C) Solar Energy, i,e, Energy that comes from the sun
In a redox reaction, which ion would you expect to be more easily reduced?.
Answers
A pure sample of a monoprotic acid is dissolved in water. the sample is titrated with sodium hydroxide solution. at the point where 20.0 ml of the naoh solution has been added, the ph is 4.15. the phenolphthalein endpoint of the titration is observed when 50.0 ml of naoh have been added. what is the pka of the acid
Answers
Answer:
21 22 23 24 25 26 27 28 29 30
Explanation:
4. How does the sun release its heat?
Answers
Answer:
radiation i think
Explanation:
thts why the solar panels can maķe electricity
which word help the reader understand the meaning of stratum in paragraoh 3.
Answers
Answer:
It should be D
Explanation:
Stratum is a layer of rock in the ground
chemistry question
label them
reactants, products,activation energy etc
Answers
In the illustration A would be the reactants and E would be the products. B would be the activation energy (Ea), C would be the potential energy of reactants, F would be the potential energy of products, and D would be the potential energy change.
Energy DiagramThe energy diagram shows the energy states of the components of reactions.
From the diagram, A being the reactant becomes E, the product. The minimum energy that A needs to overcome to arrive at the product (activation energy) is B.
The energy state of the reactant A before becoming the product is C while that of the product E is F. The difference in the energy state of A and E is D.
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04. a migrating bird can travel at a speed of 10m/s. how far it will travel in 20min at this speed?
Give your answer in meters (m) and in kilometers (km).
Answers
Answer:
12000m & 12km
Explanation:
covert 20mins into seconds.
20 x 60= 1200seconds
distance = speed x time
distance = 10 x 1200
distance = 12000m
1km=1000m
12000/1000= 12km
hope that helps :)
1. Define the unit 'mole'
Answers
Answer:
Below
Explanation:
The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample
what is the advantege of relase energy in a chemica reaction
Answers
Answer:
A chemical reaction can release chemical energy stored in batteries, natural gas, and even coal. The main advantage of chemical energy is that it is abundant in nature. Chemical energy can be produced by many organic materials.
Hope this helps!!!!!!
Mark Brainleast!!!!!!!!!!!!
Which type of bond forms when two or more atoms share electrons?.
Answers
Answer:
Covalent
Explanation:
Covalent is the sharing of electrons and Ionic is transferring of electrons.
Answer:
Covalent bonds
Explanation:
the interatomic linkage that results from the sharing of an electron pair between two atoms
The second-order rate constant for the decomposition of NO2 (to NO and O2) at 573 K is 0.54 M-1 s-1. Calculate the time for an initial NO2 concentration of 0.20 mol/L to decrease to a) one-half; b) one-sixteenth; c) one-ninth of its initial concentration.
Answers
The rate of second order reaction depends on the change in the concentration of the reactants.
Second order reaction:A second order reaction is one in which the rate of reaction depends on the concentration of reactants.
For a second order reaction;
1/[A] = kt + 1/[A]o
When concentration deceresases to one-half;
1/0.1 = 0.54t + 1/0.20
1/0.1 - 1/0.20 = 0.54t
10 - 5/0.54 = t
t = 9.3 s
When concentration deceresases to one-sixteenth;
1/0.0125 = 0.54t + 1/0.20
1/0.0125 - 1/0.20 = 0.54t
80 - 5 = 0.54t
t = 80 - 5/0.54
t = 149 s
When concentration deceresases to one-ninth;
1/0.022 = 0.54t + 1/0.20
1/0.022 - 1/0.20 = 0.54t
45 - 5 = 0.54t
t = 45 - 5/0.54
t = 74 s
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explain how stalacitites and stalagmites are formed
Answers
As the redeposited minerals build up after countless water drops, a stalactite is formed. If the water that drops to the floor of the cave still has some dissolved calcite in it, it can deposit more dissolved calcite there, forming a stalagmite. Speleothems form at varying rates as calcite crystals build up. They are formed from condensation inside a cave, dripping off the ceiling.
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Select the correct answer from the drop-down menu. a scientist digs up sample of arctic ice that is 458,000 years old. he takes it to his lab and finds that it contains 1.675 grams of krypton-81. if the half-life of krypton-81 is 229,000 years, how much krypton-81 was present when the ice first formed? use the formula n = n0 . the ice originally contained grams of krypton 81.
Answers
The original mass of krypton 81 that is present in the ice is 6.70 grams.
How do we calculate original mass?Original mass of any substance will be calculated as below for the decomposition reaction is:
N = N₀(1/2)ⁿ, where
N = remaining mass of krypton-81 = 1.675g
N₀ = original mass of krypton-81 = ?
n will be calculated as:
n = T/t, where
T = total time period = 458,000 years
t = half life time = 229,000 years
n = 458,000/229,000 = 2
Now putting all these values on the above equation, we get
N₀ = 1.675 / (1/2)²
N₀ = 6.70 g
Hence required mass is 6.70 g.
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Will give brainliest
Answers
sorry i know this:
4. 2 methyl 2 heptene
The chemical formula for water is what does the formula show about each element in the compound?.
Answers
This states that
1 molecule of water contains
2 hydrogens(H)1 Oxygen(O)And if we write the chemical reaction
2H_2+O_2—›2H_2OWhat is the boiling point of water at standard atmospheric pressure?
Answers
Answer:
about 100 degrees Celsius
Explanation:
i dont cap
Which property describes a mixture? select three options. it can be separated by physical methods. it has a single chemical composition. it can appear different from different sources. it cannot be described by a chemical symbol or formula. it cannot have more than one state of matter.
Answers
The property of mixture which describes a mixture are it can be separated by physical methods, it can appear different from different sources and it cannot be described by a chemical symbol or formula.
What are mixtures?Mixtures are the compounds which are formed by the addition or combination of one or two elements or compounds.
As in the mixtures many states of matters are present and it will be filtered by using various physical methods, and it is not chemically shown by single chemical symbol or formula. Mixtures are also of two types:
Homogeneous mixtures are those in which equal compositions all over the volume is present.Heterogeneous mixtures are those in which different composition all over the volume is present.Hence options (1), (3) and (4) are correct.
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