Answer:
Explanation:
The carbon cycle describes the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere. Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms.
Covalent bonding occurs when... a electrons are shared between atoms b cations attract to anions c protons fuse in the nucleus d electrons are transferred between atoms
Answer: Covalent bonding occurs when electrons are shared between atoms. The correct option is A.
Explanation:
When atoms form a bond by sharing one or more pairs of electrons the bond is referred to as a COVALENT BOND. This is so because CV there is a natural drive for atoms to attain the electronic configuration of Group 0 which has a completely filled outermost shell of eight electrons. The covalent bond usually occurs among non- metals. Example of covalent bonding is seen in the formation of chlorine and carbondioxide molecules. Chloride atom which contains seven electrons in its outermost shell shares an electron with another chloride atom to attain a filled outermost shell leading to the formation of a chlorine molecule.
The characteristics of a covalent compound includes:
--> they contain only molecules. There are no ions, hence they do not conduct electricity.
--> they dissolve in organic solvents. They are insoluble in water.
--> they have low melting and boiling points.
B. Radiation
D. roasting
How do vibrations of particles behave when sounds travel through solids?
A occurs fast
C. occurs moderately
B. occurs very slowly
D. cannot be determined
helium gas (He) effuses ___ times faster than methane (CH4)
a. 1.80
b. 2.00
c. 2.20
d. 2.40
Answer:
b 2.00
Explanation:
I am pretty sure that is right
how many miles of Fe are in 11.8 g of Fe
Answer:
32
Explanation:
please help meee with both questions:))
74.5 g of was dissolved in 1000. of water. What is the molality of the solution? (Molar mass of KCl = 74.5g / m * o * l ; Density of water = 1.00 g/mol )
Answer: 1.00 m
Explanation:
Hurry please need fast
In the following chemical phrase how many moles of O are there? 6
C2H602* 2
6
12
3
In making her morning tea, Dorothy drops a sugar cube into some hot water. She stirs the mixture but no longer sees the sugar cube at the bottom of her mug. Based on her observation of sugar dissolving in hot water, she can properly conclude that the sugar is
Answer:
Hydrophilic
Explanation:
A hydrophilic substance is any substance that interacts efficiently with water.
Since water is a polar solvent, a hydrophilic substance must also be polar in order to interact with water since like dissolves like in chemistry.
The fact that sugar disappears in hot water indicates that sugar is a polar hydrophilic substance because only a polar solute can dissolve in water
Based on her observation of sugar dissolving in hot water, she can properly
conclude that the sugar is hydrophilic.
A substance is said to be hydrophilic when it is able to react and dissolve in
water due to the attractive force between them. Hydrophobic substances
don't dissolve in water.
In this scenario, we were told the sugar dissolved completely in water which
means that the sugar is hydrophilic.
Read more on https://brainly.com/question/1600542
____Al+____O2 → ____Al2O3
Which of the following sets of coefficients would correctly balance the equation and why?
A. 2, 2, 2; because you must use the same coefficient for each substance.
B. 2, 3, 2; because you must have the same number of atoms on each side of the equation.
C. 4, 3, 2; because you must have the same number of compounds on each side of the equation.
D. 4, 3, 2; because you may have the same number of atoms on each side of the equation
Answer:
D
Explanation:
You balance an equation so that all the elements have the same number of atoms on each side of the equation.
PLZ HELP PLZ PLZ ILL MARK AS BRAINLIESTT!!!!
Q.1-
Given,
mass - 10grams
volume - 24 cm³
density = mass/volume
density = 10/24
density = 0.416 g/cm³
Q.2-
Given,
mass - 700grams
volume - 1100cm³
density = mass/volume
density = 700/1100
density = 0.6363 g/cm³
Calculate the mass percent for a solution of 6.5 g KOH in 250 g water
Answer:
2.53%
Explanation:
mass percent = (mass of solute/mass of solution)×100%
mass percent = [6.5 g/(6.5 + 250) g]×100% = 2.53%
Use the information provided in the table to
determine the K, for methylammonium ion, the
conjugate acid of methylamine.
X6.8 x 10-19
4.4 x 1010
2.8 x 109
2.3 x 10-11
Answer: D
Explanation:
2.3x10-11
Answer:
D. 2.3 x 10^-11
Explanation:
Look at the image below
Which of the following is NOT a type of mucle tissue?
Cardiac
Smooth
Striped
Skeletal
Answer:
Striped should be the answer
Which is not an example of a
parasite/host relationship?
A flea on a dog
A tick on a horse
A toad on a lily pad
A barnacle on a whale
Answer:
A toad on lily pad
Explanation:
have a great day
What is the charge of Mn in MnO4- ?
Answer: +7
Explanation: Sum of all the oxidation numbers in a polyatomic ion is equal to the charge on the ion. Thus, the total charge on the polyatomic anion is −1. Thus, the oxidation number of Mn in MnO−4 is +7.
What must happen to uranium before it can be used as a fuel source?
A. No changes are necessary.
B. Stable U-235 must be enriched with 3% radioactive U-238.
C. Stable U-238 must be enriched with 3% radioactive U-235.
D. Unstable U-235 must be enriched with 5% U-238 to stabilize it.
Answer:
D
Explanation:
Before it can be used in a reactor for electricity generation, however, it must undergo a series of processes to produce a useable fuel. For most of the world's reactors, the next step in making the fuel is to convert the uranium oxide into a gas, uranium hexafluoride (UF6), which enables it to be enriched.
Unstable U-235 must be enriched with 5% U-238 to stabilize it. Hence, option D is correct.
What is radioactive?Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei into atomic nuclei to form more energetically stable atomic nuclei.
Before uranium can be used in a reactor for electricity generation, however, it must undergo a series of processes to produce a useable fuel.
For most of the world's reactors, the next step in making the fuel is to convert the uranium oxide into a gas, uranium hexafluoride (UF6), which enables it to be enriched.
Hence, option D is correct.
Learn more about radioactive here:
https://brainly.com/question/1770619
#SPJ2
If we were to add a piece of solid Cu to an aqueous solution (in water) of silver nitrate, the Silver would be replaced in a single replacement reaction forming aqueous copper (II) nitrate and solid silver. How much silver, in grams, is produced if 15.00 grams of Cu is added to the solution of silver nitrate
Answer:
50.9 g of Ag
Explanation:
Reaction is:
Cu (s) + 2AgNO₃(aq) → 2Ag (s) + Cu(NO₃)₂ (aq)
1 mol of Cu react to 2 moles of silver nitrate in order to produce 2 moles of solid silver and 1 mol of copper (II) nitrate.
We assume, the silver nitrate in excess.
We determine moles of copper → 15 g . 1mol / 63.55 g = 0.236 moles
Ratio is 1:2. 1 mol of copper produce 2 moles of silver
0.236 moles of Cu will produce (0.236 . 2) / 1 = 0.472 moles of Ag
We deterine mass of silver:
0.472 mol . 107.87 g /mol = 50.9 g
Water and phosphorus with a total mass of 200 grams are added to a flask like the one below and then the flask is sealed with a rubber stopper. The flask is then heated up so that a reaction occurs but no gas from the reaction escapes the flask. How much mass would you expect to be in the flask after the reaction occurs
Answer:
h20 o3vbjbxhnnhbnkknnchemesry
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. The total mass will be 200g in the flask after the reaction occurs.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.
The total mass of reactant water, phosphorous is 200g, then the total mass of product will remain same after reaction according to law of conservation of mass.
Therefore, the total mass will be 200g in the flask after the reaction occurs.
To know more about law of conservation of mass, here:
https://brainly.com/question/28711001
#SPJ5
(b)
Calculate the amount of iron that can be extracted from 2000 tonnes of haernatíte.
(Relative atomic masses: O = 16; Fe = 56)
Answer:
Explanation:
i have already given the answer earlier. you could click this link:
https://brainly.com/question/23568294
What is the mass (in grams) of 4.5 x 10^23 units of NaCl?
could you also explain?
Answer:
43.7 g
Explanation:
unit mass of NaCl = (23 + 35.5) u = 58.5 u
58.5 is the mass of one unit formula of NaCl (since NaCl is not a molecular compound)
1 u = 1.661×10^-24 g
if 1 unit formula of NaCl has 58.5 u, then 4.5×10²³ units of NaCl will have:
58.5 u × (1.661×10^-24 g/1 u) × 4.5×10²³ = 43.7 g
HELP ASAP
Which of these atoms ihas the HIGHEST reactivity?
Answer:
aaaaaaaaaaaaaaaaaaaaaaaaassaaaa
Hii! i’m timed so can someone please answer quickly!
What is the frequency of this wave? 1,2,3, or 4
I cant find any answers to this question! i really appreciate it!
Count the in between joint bunches of curve lines .
First one at beginninglast one at end .And one is in middleFrequency is 3-1=2
The specific heat of lead is 0.129 J/gC. Find the amount of heat released when 2.4 moles of lead are cooled from 37.2C to 22.5C.
Answer:
-943J or 943J released
Explanation:
m=2.4 mol x 207.g/ mol=497.3g
c=.129 J/gC
T= T f-Ti=(22.5-37.2)=-14.7C
Q=?
Q=(49.3g)(.129 J/g C) (-14.7 C)
= -943 J or 943 J released
4) The equilibrium constant, Kc, is 3.2 x 10-34 at 25 °C for the reaction represented
below.
2 HCl(g) = H2(g) + Cl2(g)
a. Write the equilibrium expression, Kc, for the reaction.
b. Suppose you start out with only reactants in a rigid container at 25°C. The
initial concentration of HCl(g) is measured to be 0.375 M. What are the
concentrations of each gas when the system reaches equilibrium?
Answer:
a. Kc = [H2] [Cl2] / [HCl]²
b. [H2] = 6.7x10⁻¹⁸M
[Cl2] = 6.7x10⁻¹⁸M
HCl ≈ 0.375M
Explanation:
a. The expression, Kc, is defined as the ratio of the concentrations of the products over reactants powered to its coefficients. For the reaction, Kc is:
Kc = 3.2x10⁻³⁴ = [H2] [Cl2] / [HCl]²b. If you start with a concentration of HCl of 0.375M, the concentrations in equilibrium are:
[H2] = X
[Cl2] = X
[HCl] = 0.375M - 2X
Where X is reaction coordinate
Replacing:
3.2x10⁻³⁴ = [X] [X] / [0.375M - 2X]²
3.2x10⁻³⁴ = X² / 0.140625 - 1.5 x + 4 X²
4.5x10⁻³⁵ - 4.8x10⁻³⁴X + 1.28x10⁻³³X² = X²
4.5x10⁻³⁵ - 4.8x10⁻³⁴X - X² = 0
Solving for X:
X = -6.7x10⁻¹⁸. False solution, there is no negative concentrations
X = 6.7x10⁻¹⁸M
Thus:
[H2] = 6.7x10⁻¹⁸M
[Cl2] = 6.7x10⁻¹⁸M
HCl ≈ 0.375M
The correct Answer is:
Answer a. Kc = [H2] [Cl2] / [HCl]²
Answer b. [H2] = 6.7x10⁻¹⁸M
Then [Cl2] = 6.7x10⁻¹⁸M
Now, HCl ≈ 0.375M
Explanation:a. When The first expression, Kc, is defined as the ratio of the concentrations of the products that will be over reactants powered to its coefficients. For the reaction, Kc is:
After that Kc = 3.2x10⁻³⁴ = [H2] [Cl2] / [HCl]²b. When If you start with a concentration of HCl of 0.375M, so that, concentrations in equilibrium are:
After that [H2] = X Now, [Cl2] = X So that, [HCl] = 0.375M - 2X Where X is reaction coordinate After that the Replacing: 3.2x10⁻³⁴ = [X] [X] / [0.375M - 2X]² 3.2x10⁻³⁴ = X² / 0.140625 - 1.5 x + 4 X² 4.5x10⁻³⁵ - 4.8x10⁻³⁴X + 1.28x10⁻³³X² = X² 4.5x10⁻³⁵ - 4.8x10⁻³⁴X - X² = 0 After Solving for X that is: Then X = -6.7x10⁻¹⁸. False solution, there is no negative concentrations Then X = 6.7x10⁻¹⁸M Thus that: When [H2] = 6.7x10⁻¹⁸M When [Cl2] = 6.7x10⁻¹⁸M Then HCl ≈ 0.375MLearn more about:
https://brainly.com/question/13522396
Look at the diagram below. According to the diagram, what substance(s) are the
reactant(s)? What substance(s) are the product(s)? Explain your reasoning.
NH3(aq) + HCI (aa)
Ammonia Hydrochloric acid
NHCI (aa)
Ammonium chloride
You will be graded on the following rubric:
luje
Answer:
NH3(aq) and HCl(aq) are the reactants, while NH4Cl(aq) is the product.
Explanation:
The hydrogen atom from the HCl molecule joins the other three in NH3 creating a four hydrogen molecule, NH4Cl.
If 5.60 mol of a substance releases 14.9 kJ when it decomposes, what is ΔH for the process in terms of kJ/mol of reactant?
Answer:
The correct approach is "-2.67 kJ/mole". A further solution is described below.
Explanation:
The given values are:
No. of moles,
= 5.60 mol
Substance releases,
ΔH = 14.9 kJ
Now,
The ΔH in terms of kJ/mol will be:
= [tex]\frac{\Delta H}{5.60}[/tex]
On putting the given values of ΔH, we get
= [tex]\frac{-14.9}{5.60}[/tex]
= [tex]-2.67 \ kJ/mole[/tex]
What causes severe weather to occur?
Answer:
i hope this helps
...............................
.What is the significance of genetic variation within the population of moths during and after the Industrial Revolution in London?
Answer:
The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.
Explanation:
I did this on Savvas Realize got it right.
Genetic variation is said to be the difference in the hereditary sequence. After the industrial revolution, the frequency of the dark-colored moth increased dramatically more than the light-colored moths.
What is industrial melanism?
Industrial melanism was an example of the evolutionary effect that occurred in the moths where the dark-colored species were favored over the light-colored species of peppered moths.
Before the industrial population, light-colored moths were large in number which later decreased with an increase in pollution. This occurred due to an increase in the pollutants and dust deposition that altered the environment.
As the pollution increased over time the dark-colored moths became dominant and increased their population over time. This is an example of industrial melanism as the color of the body was the determining factor in survival.
Therefore, dark-colored moths were prevalent after the industrial revolution.
Learn more about industrial melanism here:
https://brainly.com/question/15283847
#SPJ5
Experiment: Select the DATA tab, and check that every species is selected. Click Advance year 10 times. Which fish populations increased, and which fish populations decreased?
arts Per Thousand ... Click advance year 10 times. ... Which organism was most hurt by increased storms, and why do you think this is so? ... On the Coral Reef tab I see less fish and on the Data tab I see Staghorn Coral has majorly decreased. ... B. How does this change the populations of the two species that eat algae, ...
Answer:
increase: yellow tail snapper
decrease: grouper, parrotfish, angelfish
Explanation:
Calculate the amount of 0.1 M acid needed to neutralize 10,000 liters of pH 8.0 water. The acid is carbonic acid (H₂CO₃).
Answer:
50mL of the 0.1M acid are needed to neutralize the solution
Explanation:
To solve this question we have to calculate the moles of OH- present in the basic solution. Based on the reaction:
2OH- + H2CO3 → 2H2O + CO3²⁻
we can find the moles of carbonic acid (And its volume) required for the complete neutralization as follows:
Moles OH-:
pH = -log [H+]
10^-pH = [H+]
[H+] = 1x10⁻⁸M
As:
[OH-] = Kw / [H+]
[OH-] = 1x10⁻¹⁴ / 1x10⁻⁸
[OH⁻] = 1x10⁻⁶M
The moles in 10000L are:
10000L * (1x10⁻⁶moles OH- / L) = 0.01 moles OH-
Moles H₂CO₃ required:
0.01 moles OH- * (1mol H₂CO₃ / 2mol OH⁻) = 0.005 moles H₂CO₃
Volume:
0.005 moles H₂CO₃ * (1L / 0.1moles) = 0.05L =
50mL of the 0.1M acid are needed to neutralize the solution