Answers
Answer:
Explanation:
option A ..... 1 and 2
....same electronic configuration=same valence electrons=same no. of protons=same atomic no.
Answer:
A
Explanation:
Particles 1 and 2 have the same electronic configuration and same number of protons, therefore they are the same element.
Related Questions
Plants can only
cause mechanical weathering.
Please select the best answer from the choices provided
OT
OF
Answers
Answer:
Ice wedging, pressure release, plant root growth, and abrasion can all cause mechanical weathering. in the cracks and pores of rocks, the force of its expansion is strong enough to split the rocks apart. This process, which is called ice wedging, can break up huge boulders.
Answer:
f
Explanation:
why do synthetic fibers cause soil pollution
Answers
Answer:
because they don't decay easily bue to which if we throw on soil than it causes pollution.
Answer:
Explanation:
Sythetic fibres do not have air spaces or pores in them... it chokes the soil and block the pores through which water can flow so the soil is unable to take up air or absorb water.... henc its quality decreases, roots of plats are unable to suck up water, Synthetic fibres take years to decay...therefore causes soil pollution
The overall process of photosynthesis has the balanced chemical equation 6CO, +6H,0 CH.0, 60, What does this tell you about the relative amounts of carbon
dioxide and water consumed in this process?
A. For every six moles of carbon dioxide consumed, one mole of water is consumed
B. For every mole of carbon dioxide consumed, one mole of water is consumed
C. For every gram of carbon dioxide consumed, one gram of water is consumed
D. For every six grams of carbon dioxide consumed, one gram of water is consumed.
Answers
Answer:
(C)
Explanation:
Because of the physics of it.
According to the overall equation of photosynthesis as follows: 6CO2 + 6H2O = C6H12O6 + 6O2, for every mole of carbon dioxide consumed, one mole of water is consumed.
What is photosynthesis?Photosynthesis is the process by which plants and other photoautotrophs convert light energy into chemical energy.
Photosynthesis makes use of carbon dioxide and water to produce glucose and oxygen as follows:
6CO2 + 6H2O = C6H12O6 + 6O2
This chemical equation suggests that for every mole of carbon dioxide consumed, one mole of water is consumed.
Learn more about photosynthesis at: https://brainly.com/question/1388366
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In order from left to right, what are the coefficients (front numbers) needed to
balance the following equation? CzH6 + O2- CO2 + H20*
Answers
Answer:
10CH6 + 10O2 → 10CO2 + 3H20
Explanation:
250 g H 2 SO 4 completely reacted with aluminum?
2AI(s) + 32504(aq)- AI2 (504) 3(aq) + 3H 2 (9)
0.85g
450g
290g
870g
Answers
Answer: 290 g of aluminium sulphate is produced.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} H_2SO_4=\frac{250g}{98g/mol}=2.55moles[/tex]
The balanced chemical reaction is:
[tex]2Al(s)+3H_2SO_4(aq)\rightarrow Al_2(SO_4)_3(aq)+3H_2(g)[/tex]
According to stoichiometry :
3 moles of [tex]H_2SO_4[/tex] produce = 1 mole of [tex]Al_2(SO_4)_3[/tex]
Thus 2.55 moles of [tex]H_2SO_4[/tex] will require=[tex]\frac{1}{3}\times 2.55=0.85moles[/tex] of [tex]Al_2(SO_4)_3[/tex]
Mass of [tex]Al_2(SO_4)_3=moles\times {\text {Molar mass}}=0.85moles\times 342g/mol=290g[/tex]
Thus 290 g of aluminium sulphate is produced.
The pH of a substance can only be determined when it is
a) dried in a powder
b) frozen
c) dissolved in water
d) heated
Answers
a) dried in a powder
b) frozen
c) dissolved in water
d) heated
It’s frozen
B
The pH of a substance can only be determined when it is frozen. Hence, option B is correct.
What is pH?pH stands for Hydrogen potentials.
The use of the pH scale is one practical way of quantitatively determining how acidic something is.
If the pH of a solution is less than 7, it is acidic. If the pH is 7, the solution is neutral and if the pH is greater than 7,the solution is basic.
The pH of a substance can only be determined when it is frozen. Hence, option B is correct.
Learn more about the pH here:
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i’m BEGGING you PLEASE help me :(((
Answers
Answer:
C.
Explanation:
Since we are trying to find the amount of moles of oxygen, we use the balanced equation to help us out. Since there are 4 moles of Sb for every 3 moles of oxygen, we must use a conversion to let us get rid of the Sb unit and get our desired unit of moles of oxygen. Therefore, C is our best answer.
A 3.0 mole sample of KCIO3 was decomposed according to the equation:
2KCIO3(s) ===> 2KCI(s) + 3O2(g)
How many moles of oxygen (O2) will be formed?
o 2.5 moles
4.0 moles
3.0 moles
2.0 moles
4.5 moles
Answers
Answer:
4.5 moles
Explanation:
From the equation, the mole ratio of KClO3: O2 = 2: 3
Which means, every 2 moles of KClO3 forms 3 moles of O2.
Let the no. of moles of O2 formed be y.
[tex]\frac{2}{3} = \frac{3.0}{y}[/tex]
2y = 3x3
2y = 9
y = 4.5 moles
Calculate the heat of reaction, ∆H°, for the following:
3FeCl2(s) + 4H2O(g) Fe3O4(s) + 6HCl(g) + H2(g)
Answers
Answer:
562.76 kJ
Explanation:
∆H° (kJ) is the total of the heats of formation of the products minus the total of the heats of formation of the reactants.
NB: look up the heats of formation of the compounds in the heats of formation reference tables, it is found at the back of most chemistry text
heats of formation of the products (i.e. Fe₃O₄(s) , 6HCl(g) , H₂(g) ) = -1120.9 + 6(-92.3)+ 0 = -1674.7 kJ
heats of formation of the reactants (i.e. 3FeCl₂(s) , 4H₂O(g) ) =3(-423.42) + 4(-241.8) = -2237.46kJ
∆H° = -1674.7 kJ - (-2237.46kJ) =562.76 kJ
Calculate the volume in liters of a 0.00183g / L mercury(1) chloride solution that contains 125 mg of (Hg 2 Cl 2 ) .
Answers
Answer: 68.3L
Explanation:
Density = Mass / Volume
Density = 0.00183 g/L
Mass = 125 mg = 0.125g
Volume = Mass / Density = 68.3L
MODomy
OCTORS
Question 14 Multiple Choice Worth 5 points)
(07.04 MC)
The final stage of polymerase chain reaction to create a new strand of DNA that binds to the original strand, where special enzymes
attach to primers and attach complementary bases along the strand, is called
annealing
extension
denaturing
hybridization
Question 15/Multiple Choice Worth 5 points)
7
(07.04 MC)
Answers
Answer:
hybridization is the correct answer i guess
Answer:
Extension
Explanation:
PCR has three stages: denaturing, annealing, and extension (in this order).
I, myself, took this exam and got the answer correct.
Consider the combustion of octane:
2C8H18(g) + 2502(g) ===> 16CO2(g) + 18H2O(g)
Calculate the mass of water (H20) produced from 11.2 grams of octane (C3H18) assuming excess
oxygen.
15.9 g
O 0.196 g
O 4.31 g
1.77g
14.1g
Answers
Answer:
15.9 g
Explanation:
(Take the atomic mass of C=12.0, H=1.0, O=16.0)
no. of moles = mass / molar mass
no. of moles of octane used = 11.2 / (12.0x8 + 1x18)
= 0.0982456 mol
Since oxygen is in excess and octane is the limiting reagent, the no. of moles of H2O depends on the no. of moles of octane used.
From the balanced equation, the mole ratio of octane : water = 2:18 = 1: 9,
so this means, one mole of octane produced 9 moles of water.
Using this ratio, we can deduce that (y is the no. of moles of water produced):
[tex]\frac{1}{9} =\frac{0.0982456}{y}[/tex]
y = 0.0982456x9
y= 0.88421 mol
Since mass = no. of moles x molar mass,
mass of water produced = 0.88421 x (1.0x2+16.0)
=15.9 g
plz help!!!!!!
This equation for the reaction when solid magnesium and solid lead (II) oxide are heated together is:
Mg(s)+Pb(s) => MgO(s)+Pb(s)
a)what does tell you about the position of lead in the reactivity series? explain your answer.
b)rewrite equation as an ionic equation
Answers
this shows that magnesium is higher in the reactivity series than lead.
I don't think there can be an ionic equation written because both components are in solid form and neither is in an aqeuos state.
Reactivity series is the progression of the metals based on the activity. In a reaction between magnesium and lead (II) oxide, it can be said that lead is at a lower position in the reactivity series.
What is reactivity series?Reactivity series is the depiction of the metals in a decreasing order based on their ability to displace the other metal in the reaction. More reactive species are placed at the upper position, while the less reactive species are placed at the lower positions.
In the series, magnesium is placed at the upper part of the series and has high reactivity, whereas lead is placed at the lower level with low reactivity. hence, in the reaction, Mg replaces Pb and forms a bond with oxygen.
The reaction between magnesium and lead (II) oxide cannot be written in the ionic form as all the reactants and the products are in the solid state and not in an aqueous state.
Therefore, lead is at a lower level of reactivity series.
Learn more about the reactivity series here:
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Based on the graph, describe what is happening between 4 and 6 seconds. The object is moving away from the start at a constant speed. The object is not moving. The object is returning to the start at a constant speed. The object is changing speed.
Answers
Answer:
The object is not moving.
Explanation:
Since the position doesn't change during 4-6 (remains constant at 12m) it tells us that object is not moving and remaining at constant distance from start point.
Answer:
The object is not moving.
Explanation:
Since the distance hasn't changed from 4 seconds to 6 seconds, we know that the distance from the start stays the same between the time period. The object isn't moving away or moving closer at a constant speed, but is staying the same, constant distance away at a constant speed. Therefore, the object isn't moving.
What precipitate sometimes forms during an acid-base neutralization reaction?
a)
sugar
b) water
c) salt
d) carbon
Answers
Answer:
The answer is option C.
Salt
Hope this helps you
In the past mining companies were not made responsible for the clean-up of any of
the mine sites. As a result, abandoned mines had a severe impact on the
environment in Ontario. Which of these is not a result of these mining practices?
a)
Chemical reactions producing sulphuric acid decrease soil and water ph in the
area.
b)
Acid leaching dissolves metals found in the soil thus allowing them to enter
the water system.
c)
Heavy metals which are left tailing ponds can dissolve and enter the water
system.
d)
Old and inefficient mining smokestacks contaminate the soils around
abandoned mine sites.
Answers
1. Give IUPAC for the following compound
Answers
Answer:
Ethane
Explanation:
What is the concentration of a solution when 50.0 mL of 0.436 M NH ₄NO ₃ is diluted to a new volume of 250.0 mL
Answers
Answer:
0.0872 M
Explanation:
Use the equation M1V1 = M2V2
0.436(50.0) = (x)(250.0)
21.8 = 250x
0.0872 = x
Which statement best describes how an ionic bond forms?
The transfer of electrons forms strong bonds between ions.
The sharing of electrons forms strong bonds between ions.
The transfer of electrons results in attractive forces between molecules
The sharing of electrons results in attractive forces between molecules
Mark this and return
Save and Exit
Nexus
Submit
Answers
Answer:
The transfer of electrons forms strong bods between ions
Explanation:
How is alchemy different from modern chemistry?
O A. Alchemy experiments only with living things, and chemistry uses
chemicals
O B. Alchemy was practiced before Aristotle, and chemistry has been
popular since his death.
C. Alchemy is not scientific, but chemistry is based on evidence.
O D. Alchemy covers all areas of science, but chemistry covers only
matter.
Answers
Answer:
C. Alchemy is not scientific, but chemistry is based on evidence.
Explanation:
Alchemy was based on mystical beliefs instead of the scientific method.
Chemistry is the study of matter and change based on evidence.
A reversible reaction has an equilibrium constant of 0.75. If the forward rate constant is 0.62 mol/L/s, what's the reverse reaction rate constant?
A. 0.910
B. 0.827
C. 1.010
D. 1.210
Answers
Answer: B.) 0.827
Explanation:
Given the following :
Equilibrium constant (k) = 0.75
Forward rate constant = 0.62 mol/L/s
Backward rate constant =?
The equilibrium constant denited as 'k' is the proportion of the forward rate constant and the reverse rate constant.
Mathematically,
K = [forward rate constant / Reverse rate constant]
k = 0.75 ; forward rate constant = 0. 62mol/L/s
0.75 = [ 0.62mol/L/s ÷ reverse rate constant]
Reverse rate constant * 0.75 = 0.62mol/L/s
Reverse rate constant = (0.62mol/L/s ÷ 0.75)
Reverse rate constant = 0.8266mol/L/s
Reverse rate constant = 0.827mol / L/s
Answer:
0.827
Explanation:
Find the 5 number summary for the number of chapters in the Old Testament. (Recall that the 5-number summary is the minimum, lower quartile, median, upper quartile, and maximum.)
Answers
Hey, I am doing this project right now too. Did you end up figuring out the answer to this? I do not understand this at all. Message me back pls!
In this lab procedure, the ___ variable is the number of half-life cycles (time) and the ___ variable is the number (or fraction) of (radioactive) Lincolnium nuclei remaining at that time.
Answers
Answer:
Independent, Dependent
Explanation:
In the given lab procedure, the number of half-life cycles or the time in which the number of nuclei in radio-active substance turns into its half would be characterized as the 'independent' variable as it directly affects the dependent variable i.e. 'the number(or fraction) of Lincolnium nuclei remaining at that time.' The number of nuclei would be the dependent variable as it bears the change or effect of a change in the independent variable(half-life cycle).
Answer:
Its independent and dependent
Explanation:
On Edge 2021
Which element's total number of electrons is equal to the number of core
electrons in iron (Fe)?
The Periodic Table
O A. Potassium (K)
B. Argon (Ar)
C. Krypton (Kr)
D. Sodium (Na)
Answers
Answer:
i belive its b
Explanation:
Which of the following is best described by the term macroscopic?
A. Water in the liquid phase boils to become a gas.
B. Water molecules in the solid phase are tightly held together.
C.H2O
D. Water is composed of two hydrogen atoms and one oxygen atom.
Answers
Answer:
A
Explanation:
Since macroscopic means visible to the naked eye without a microscope it would be A. This is because we can see active phase changes in real time without any magnification like water boiling or ice melting.
Answer:
a is the correct answer
Explanation:
At a certain temperature, Ke = 3 for the reaction NO3(g) NO(g) + O2(g) Find the direction of thereaction if at some point in time in a 1.0 vessel the following respective concentrations were measured; [NO] = 2.0 mol/L, [O2] = 1.0 mol/L and NO3(g) = 0.75 mol/L.
Answers
A 13.00 g sample of citric acid reacts with an excess of baking soda as shown in the equation.
H3C6H507+3NaHCO3->3CO2+3H20+Na3C6H507
What is the theoretical yield of carbon dioxide? 0.993 g 2.98 g 3.65 g 8.93 g
Answers
Answer:2.98
Explanation:
Answer:
D) 8.93 g
Explanation:
In the equation 2KCIO3 → 2KCI + 302, how many moles of oxygen are produced when 12.61 mol of
KCIO3 decompose completely?
Select one:
O a. 19
Ob. 8.4
O c. 6.3
O d. 13
PLEASE I AM BEGGING PLEASE HELP ME
Answers
Answer:
A 19
Explanation:
2 mole of KClO3 produces 3 mole of O3
2 : 3
1 : 3/2
12.61 : 3/2 × 12.61
12.61 : 18.9
12.61 mole of KClO3 produces 18.9mole of O2.
I really need help!!!
look at the three chemical equations below. How many atoms of each element are in reactants? How many atoms of each element are in the products?
2H2 + O2➔ 2H2O
2Fe203➔ 4Fe+ 3O2
CI2+ 2NaBr➔ 2NaCI+ Br2
Answers
Line two: 4fe atoms 6o atoms on reactant and product side.
Line three: 2cl atoms, 2na atoms and 2br atoms on both the reactant and product side.
Which of the following elements will not form a polar covalent bond with oxygen?
A. Hydrogen
B. Sodium
C. Oxygen
D. Fluorine
Answers
sodium will form an ionic bond
Answer:
C. Oxygen
Explanation:
Oxygen will not form a polar covalent bond with another oxygen atom because when 2 atoms of the same element bond, it is a nonpolar covalent bond.
Since they are the same element, the 2 oxygens have the same electronegativity and will share their electrons equally.
Polar covalent bonds involve 2 atoms that will share electrons unequally