Answer:
14
Explanation:
the mass number = protons number +neutrons number
so..
6+8=14
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:
Which term describes this reaction?
addition
condensation
elimination
substitution
Addition is the answer
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.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.
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
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 is the number of oxyegen on periodic table?
Answer:
16
Explanation:
Answer:
Oxygen has an atomic number of 8
Explanation:
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
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:
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.
what is the first thought when u hear the word mole?
The word mole is one of those crazy words that have multiple meanings that can sometimes lead to confusion. Perhaps your first thought after hearing the word is a cute little animal that burrows in the ground.
pls mark me as brainliest and thank me
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?
Energy has different _____ , such as electrical, chemical, and thermal.
Answer:
forms/types
Explanation:
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:
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
How many molecules are in 200.0 g of ammonium sulfide
Answer: 1.51355 mol.
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
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
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!
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
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
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
Humans are most abundant during which geological era?
Cenozoic
Precambrian
Palcozoic
Mesozoic
Answer:
Cenoizic
Precamborian
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 many types of chemical reactions exist?
How can a chemical equation be made more informative?
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:
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.
_____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! :)
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
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.Liquids are not easily compressible but flow easily.
O True
O False