Answer:
about 30 meteor showers
Explanation:
If an atom of calcium has two dots for its Lewis structure, then it means that this atom has...
O 18 electrons
O 2 valence electrons in shell 4
O 2 valence electrons in shell 1
O three shells, only
Answer:
2 valence electrons in shell 4 is ur ans
Short description about health science
Answer:
Both traditional Western and alternative medicine can be considered health sciences. ... The field includes the study of medicine, nutrition and other health-related issues and the affect they may have on both humans and animals.
Explanation:
How many molecules are in 200.0 g of ammonium sulfide
Answer: 1.51355 mol.
Explanation:
As an electron in an atom moves from a higher energy state to a lower energy state, the atom
1 becomes a negative ion
2 becomes a positive ion
3 releases energy
4 absorbs energy
Answer:
3 releases energy
Explanation:
An electron in an energy level has a definite amount of energy associated with it at that level.
Electrons can undergo transitions from one level to another. However, when the electron changes its state, it must absorb or emit the exact amount of energy which will bring it from the initial to the final state.
When the electron is excited, it moves from the ground state to an excited state, it must absorb energy. On returning from an excited state to a lower level or the ground state, energy is emitted, giving rise to a line in the spectrum.
Answer: 3 because it releases energy
The provided balanced equation applies to the reaction that takes place between zinc metal and copper(I) nitrate.
Zn +2 CuNO3 - Zn(NO3)2 + 2 Cu
If the reaction begins with 0.037 moles of zinc and 0.11 moles of copper(I) nitrate, how many grams of copper metal can be produced? Assume 100%
yield. Round off your answer to the nearest tenth of a gram. Record your answer in the grid.
Here ^ you have to tap to see the full pic. comment if u dont understand anything :)
Mass of copper produced = 5 g
The balanced chemical equation:
Zn + 2CuNO₃ → Zn(NO₃)₂ + 2Cu
Given:
0.037 moles of zinc and 0.11 moles of copper(I) nitrate
To find:
Mass of Cu metal produced=?
The amount of CuNO₃ produced =0.11/2=0.055moles
Thus, amount of copper=0.037*2= 0.0740 moles
The mass of copper produced =0.0740*63.5=4.699g=5g
Therefore, the Mass of Cu produced will be 5 g.
Learn more:
brainly.com/question/13852350
What happens in all solutions?A. Two gases are in the same space.
B. Liquids are stirred together rapidly.
C. A solid mixes with a liquid and slowly settles out.
D. Two substances mix evenly without reacting.
Answer:
D. Two substances mix evenly without reacting.
Explanation:
Solutions are homogenous mixtures of solutes and solvents.
In a solution, the solute particles are distributed uniformly in the solvent. The solute is the substance that is dissolved to make the solution. It is usually present in smaller amount than the solventThe solvent is the dispersing substance that allows the solute to go into solution. The solute could be solid or liquid or gasThe solvent could be solid or liquid or gas but most times liquid.Energy has different _____ , such as electrical, chemical, and thermal.
Answer:
forms/types
Explanation:
Which evidence shows that heat is given off when a candle burns?
A. A match is used to light the candle.
B. The burning candle produces a yellow flame.
O c. Covering the burning candle extinguishes the flame.
D. Solid candle wax near the flame melts as the candle burns.
thing
Answer:
D. solid candle wax near the flame melts as the candle burns.
Answer:
Part D, melting is a product of heating
Explanation:
What is an advantage of using natural gas rather than a coal burning power plant?
Answer:
I hope it helps u
Explanation:
The advantages of using natural gas rather than coal are the following,
Natural gas is present in large amount than coal.Natural gas is less costly than other fossil fuel sources of energy. It increases security by decreasing dependence.Natural gas is more environmentally friendly.Natural gas is much safer to store.It is reliable.Natural gas is a fossil fuel, though the global warming emissions from its combustion are much lower than those from coal or oil.Natural gas emits 50 to 60 percent less carbon dioxide (CO2) when combusted in a new, efficient natural gas-power plant compared with emissions from a typical new coal plant.The group of the periodic table determines the ___.
Answer: C. Number of valence electrons
Explanation: A group is a vertical column in the periodic table, which signifies the number of valence shell electrons in an element's atom. Example: all the elements in group 1 have 1 electron in their outer most shell.
what is the relative formula mass of butane?
Answer:
The molecular formula of butane is C4H10. Calculate its molar mass.58.1 g/mole 14. is answer.
Explanation:
I hope it's helpful!
why does the moon appear to be so bright in the sky
Answer:
The shine of the Sun on the lunar surface brightens it, while also giving the moon "dark sides". Its position in Earth orbit allows it to have certain phases because of its orbital position relative to the sun. You're welcome.
Explanation:
_____are chains of amino acids
lipids
carbs
proteins
nucleic acids
Answer: proteins
Explanation:
Which of the following would be an example of applied science?
Investigating how carbon dioxide levels impact ocean pH
Investigating why water expands when it freezes
Investigating the conductivity of metalloids
Investigating how to develop a more efficient solar panel
Answer:
Investigating how carbon dioxide levels impact ocean pH
Explanation:
I hope this helps! :)
Which term describes this reaction?
addition
condensation
elimination
substitution
Addition is the answer
A gas occupies 2.5 L at 2.5 atm. What is the volume if the pressure changes to 1.5 atm?
Answer:
p1v1=p2v2
2.5×2.5=1.5×v2
6.25=1.5v2
6.25 /1.5=v2
4.16L=v2
Using the reaction below determine the amount of Sulfur proceduced in grams (this is a limiting reaction question) 2 H2S + SO2 -> 3 S + H2O 3.26g of dihydrogen sulfide react with 4.42 g of sulfur dioxide
Answer:
= 2.2 g pf S. produced
Explanation:
Balanced Reaction equation:
[tex]2H_{2} S + SO_{2}[/tex] → [tex]3S + 2H_{2} O[/tex]
1 mole of H2S - 34.1g
? moles - 3.2g
= 3.2/34.1 = 0.09 moles of H2S
Also,
1 mole of S02 - 64.07 g
? moles - 4.42g
= 4.42/64.07 = 0.069 moles of SO2
Meaning SO2 is the limiting reagent
Finally, 3 moles of S - 32g of sulphur
0.069 mole = ? g of Sulphur
= 0.069 x 32
= 2.2 g pf S.
60 points one of the questions im stuck on
Answer:
6 m/s is the answer.
Explanation:
speed = distance/time
(please mark me brainliest if you can)
Answer:
6 meters per second
Explanation:
they fly 60 meters in 10 seconds. So to find how many meters they fly in one second, we divide by 10.
60m/10secs = 6 m/s
A 500g sample of Ca-37 decays for 910ms. How much of the original sample remains?
Answer:
15.6 g
Explanation:
Given that;
Mass of original sample = No = 500g
mass of sample remaining at 910 ms = N = ?
time taken to decay= 910 ms
Half life of Ca-37 = 181 milliseconds
From;
N/No = (1/2)^t/t1/2
N/500 = (1/2)^910/181
N/500 = (1/2)^5
N/500 = 1/32
32 N = 500
N = 500/32
N = 15.6 g
Benjamina started her walk from the front door of her ground floor apartment.She walked 6 meters to the corner of the building and then turned the corner and walked 10 meters to her friends apartment.Identify the difference between the distance she walked and her displacement.
Answer:
See explanation
Explanation:
The major difference between distance and displacement is that distance is a scalar quantity while displacement is a vector quantity. Scalar quantities have magnitude without direction while vector quantities have both magnitude and direction.
The distance covered by Benjamina in both cases just refer to the difference in her position at each time without reference to the direction in which she changed her position.
Her displacement will clearly mention the direction in which she moved both when she walked to the front door of her apartment and when she walked to a friend's apartment.
In the expression 3H20, the 3 is a ____, while the 2 is a _____. A) coefficient: superscript B) coefficient: subscript C) superscript: subscript D) superscript: coefficient
Answer:
B) coefficient: subscript
Explanation:
Given
[tex]3H_2O[/tex]
Required
What does 3 and 2 represents
On a general term:
In [tex]nA_m[/tex]
[tex]n = The\ coefficient\ of\ A[/tex]
And
[tex]m = The\ subscript\ of\ A[/tex]
So, by comparing [tex]3H_2O[/tex] with the general term, [tex]nA_m[/tex]
[tex]n = 3[/tex]
[tex]m = 2[/tex]
Hence,
3 = coefficient and 2 = subscript
The correct answer is A) coefficient: superscript.
Given molecule:-
[tex]3H_2O[/tex]
In general:
[tex]2B_3[/tex]
2 is the coefficient of B, and 3 is the subscript of B.
So, by comparing with the given molecule, [tex]3H_2O[/tex]
3 = coefficient and 2 = subscript
Hence , the correct option is A.
To know more about:-
brainly.com/question/13685153
difference between NaOH and HCI
Answer:
hcl:-is as strong acid than water.naoh:-is as strong base than Nh3
Explanation:
hence naoh is base and HCl is acid
Liquids are not easily compressible but flow easily.
O True
O False
Rewrite and Balance the Equation
N₂ + H₂ -> NH3
Answer:N
2
+ 3
H
2
-----> 2N
H
3
Explanation:
N
2
+
H
2
-----> N
H
3
Let us balance this equation by counting the number of atoms on both sides of the arrow.
N
2
+
H
2
-----> N
H
3
N=2 , H=2 N=1, H=3
To balance the number of N atom on Right Hand Side (RHS) , I will add one molecule of N
H
3
on RHS
N
2
+
H
2
-----> 2N
H
3
N=2 , H=2 N=2 , H= 6
To balance the number of H atoms on Left Hand Side (LHS) , I will add two molecules of
H
2
on LHS
N
2
+ 3
H
2
-----> 2N
H
3
N=2 , H=6 N=2 , H= 6
Answer link
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How can I balance this equation? ___ AlBr3 + ____ K2SO4 ---> ____ KBr + ____ Al2(SO4)3
How can I balance this equation? ____ Pb(OH)2 + ____ HCl ---> ____ H2O + ____ PbCl2
Answer:
you said brainliest
Explanation:
what is the number of oxyegen on periodic table?
Answer:
16
Explanation:
Answer:
Oxygen has an atomic number of 8
Explanation:
A sample of unknown element X contains the following isotopes: 80% of C -64, 15% of X - 65, and 5% of X-66. What is the average atomic mass of element X? Can somebody help me with this question. Will mark brainliest.
Answer:
64.25
Explanation:
Average atomic mass = percentage × mass of all isotopes/ 100
Relative atomic mass = 80*64+15*65+5*66/100
=5120+975+330/100
=6425/100
64.25
Spring and autumn both have a certain day where the amount of daytime hours
and nighttime hours are the same. What is this day called?
a. Equator
b. Equilibrium
c. Equality
d. Equinox
Answer:
d. Equinox
Explanation:
A certain day in spring and autumn where the amount of daytime hours and nighttime hours are the same is called equinox.
Equinox occurs twice in a year on March 20 and September 23rd.
During an equinox, the south and north hemisphere of the earth are receiving equal amount of sunlight. The opposite of equinox is solstice in which the duration of light is unequal. The equator is the only great circle that is a line of latitude.What products are always made when any carbon-based fuel
is burned in the presence of oxygen?
a) carbon dioxide and hydrogen
b) carbon dioxide and water
c) oxygen and carbon dioxide
d) oxygen and water
Answer:
B) carbon dioxide and water
Answer: B.) carbon dioxide and water
Explanation:
bc I got it right?
Which of the following might be included in a chemical
reaction?
a) Molecules
b) lons
c) Pure elements
d) All of the above
Answer:
I think it's D
Explanation:
If the quantity of heat lost or gained is ( ΔH = mass X change in T X specific heat) mass change in T specific heat, what is the amount of heat required to raise 200.0 g of water from 22.00°C to 100.0°C?
Specific heat of water is 4.180 J/g °C