Answer:
A). An atom is an indivisible hard-sphere.
Explanation:
The 'Atomic Theory' of Dalton is characterized as the earliest model(came in 1803) which described the atoms as the indivisible and resistant spheres. He used the example of watermelon to elaborate that the atoms of a specific element share similar characteristics and the atoms of distinct elements differ in their mass as well as their size. Thus, option A is the correct 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
What is one property of salts?
Answer:
They are neutral
Explanation:
Salts are chemical compounds formed when acids and a bases are combined together. Both substances nuetralize each other as they react, thereby forming salts which are neutral substances. This resultant compounds are neither basic nor acidic. They have a pH of 7, which makes them neutral in nature.
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! :)
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:
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
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?
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
How much heat is required to change 48.5 liquid mercury (Hg) at 400 K to vapor at a 700 K? The boiling point of mercury is 629.88 K
-88 kj
-204 kj
16.2 kj
30 kj
29 kj
Answer: 4.91 kJ
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.
[tex]Q=m\times c_l\times (T_(f,l)-T_(i,l))+m\imes L+m\times c_v\times T_(f,v)-T_(i,v)[/tex]
Q = Heat absorbed = ?
m= mass of mercury = 48.5 g = 0.0485 kg
c = specific heat capacity = [tex]0.14kJ/kgK[/tex]
L = heat of vaporization = 59.2 kJ
Initial temperature of liquid mercury = [tex]T_i[/tex] = 400 K
Final temperature of mercury vapor = [tex]T_f[/tex] = 700 K
Putting in the values, we get:
[tex]Q=0.0485\times 0.14\times (629.88-400)+0.0485\times 59.2+0.0485\times 0.14\times (700-629.88)[/tex]
[tex]Q=1.56+2.87+0.476[/tex]
[tex]Q=4.91kJ[/tex]
Answer:
16.2 kj
Explanation:
1.56kj + 14.31kj + 0.34kj
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.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
How many molecules are in 200.0 g of ammonium sulfide
Answer: 1.51355 mol.
Explanation:
Which term describes this reaction?
addition
condensation
elimination
substitution
Addition is the answer
Iodine is 80% 127I, 17% 126I, and 3% 128I. Calculate the average atomic mass of Iodine.
Given
80% 127I, 17% 126I, and 3% 128I.
Required
The average atomic mass
Solution
The elements in nature have several types of isotopes
Atomic mass is the average atomic mass of all its isotopes
Mass atom X = mass isotope 1 . % + mass isotope 2.% + ... mass isotope n.%
Atomic mass of Iodine = 0.8 x 127 + 0.17 x 126 + 0.03 x 128
Atomic mass of Iodine = 101.6 + 21.42 + 3.84
Atomic mass of Iodine = 126.86 amu
A chemical reaction is a process in which what
Products produced reactants
The law of conservation of mass applies
Combustion always occurs
None of the above
the law of conservation of mass applies.....?
how many moles are in 3.00x 10^22 atoms of He?
Answer:
0.05 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.0 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.049833...[/tex]
We have the final answer as
0.05 molesHope this helps you
Liquids are not easily compressible but flow easily.
O True
O False
Calculate the percentage by mass of oxygen in Al2(SO4)3 (Al=27, S=32,O= 16) PLEASE SHOW FULL WORKING
Answer:
There is 61.538% oxygen in Al2(SO4)3.
Explanation:
Wt Of oxygen in the compound = 12*16 = 192 amu.
Total Wt. Of the compound = 2*12+3*32+12*16 = 312 amu.
Thus, percent of oxygen = Wt of oxygen/total Wt. Of compound *100
= 192/312 * 100=61.538 %
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
_____are chains of amino acids
lipids
carbs
proteins
nucleic acids
Answer: proteins
Explanation:
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 is the number of oxyegen on periodic table?
Answer:
16
Explanation:
Answer:
Oxygen has an atomic number of 8
Explanation:
Pls help me plsssss my mom is coming home soon I’ll mark brainliest hurrrrrrrrry
Answer:
Its A, sorry I wrote something else.
Explanation:
The equator is the warmest, and the sunlight is not pointing towards point A.\
Friendly guy that likes to help
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:
110 A common liquid contains 11.19% hydrogen
and 88.81% oxygen by mass.
a) Calculate the number of moles of hydro-
gen atoms and oxygen atoms in 100.0 g of
this liquid.
Explanation:
number of moles =[tex] \frac{given \: mass}{molar \: mass} [/tex]
thus, number of moles of hydrogen= 11.91/1=> 11.91number of moles of oxygen= 88.81/32 = 2.77=> 2.77hope it helps:)
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.
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:
How many molecules are in 7.50 mol of SO2
Answer:
45.165 × 10²³ molecules
Explanation:
Given data:
Number of moles of SO₂ = 7.50 mol
Number of molecules = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
7.50 mol × 6.022 × 10²³ molecules
45.165 × 10²³ molecules
Which type of galaxy forms when two other galaxies crash into each other? They are small galaxies made up of bright, young stars.
Answer:
elliptical galaxy
Explanation
:The combination of the two galaxies then forms what appears to be an elliptical galaxy as the arms begin to disappear. The merger of gasses creates new stars, and the new shape becomes more elliptical, globular, or sometimes irregular.
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: