The Rutherford experiment rose above Thompson's Model 1911 with his gold-foil experiment. He designed an experiment to use the alpha particles created by a radioactive element as probes. Hope this helps you.
How many moles of methane (CH4) are there in 87.5g of methane (CH4)?
A solution contains 90 mL of methanol, 18 mL of propanol, and 2 mL of diethyl ether. Which is the solvent in this solution?
Answer:
Methanol
Explanation:
which is the part of an experiment that serves as the point of comparison for the results
Answer:
the observation point.
Explanation:
after the experiment, you observe the data and comparing and write out formulas for the given data.
PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
Answer: I think G.
Explanation:
Answer:
I believe its student 2 as well. it's most definitely g
Which evidence did Alfred Wegener use as evidence for the Continental Drift Theory?
Group of answer choices
A)South America and Africa fit like a puzzle.
B)Matching fossils on different continents
C)Similar rock types on the East coast of North America and Western Europe
D)All of the above
pls answer and i will mark u brainliest
question:- A precious metal used in jewelry and found in a pure form in nature is:
options are :-
a. Silver
b. platinum
c. Zinc
d. copper
P, F, Cl, Si, C, O, Mg
Which of the elements above is the least electronegative?
Answer:
Mg
Explanation:
Electronegativity increase to the right and top of the periodic table. So the element that is the most toward the left and bottom is the least electronegative.
Which of the following statements is true?
Erosion can be reduced by planting trees and other plants.
Warm air is more denser than cold air.
It forms areas of high pressure.
Most of the earth's freshwater is located deep below the crust.
The most abundance gas in the atmosphere is oxygen.
Answer:
erosion can be reduced by planting trees and other plants
Answer:
A
Explanation:
What is the pressure in kPa of 2 moles of chlorine gas at a temperature of 5 degrees C
and a volume of 8 dm3?
Answer:
[tex]P=5.8x10^2kPa[/tex]
Explanation:
Hello.
In this case, since chlorine gas is assumed to behave ideally, we can use the ideal gas equation in order to compute the required pressure:
[tex]PV=nRT[/tex]
In such a way, since the temperature must be in kelvins and the volume in liters for the universal gas constant:
[tex]T=5+273.15=278.15K\\\\V=8dm^3*\frac{1L}{1dm^3}=8L[/tex]
Thus, we first compute the pressure in atm:
[tex]P=\frac{nRT}{V}= \frac{2mol*0.082\frac{atm*L}{mol*K}*278.15K}{8L}\\\\P=5.7atm[/tex]
Thus, the pressure in kPa turns out:
[tex]P=5.7atm*\frac{101.325kPa}{1atm}\\\\P=5.8x10^2kPa[/tex]
What is the relationship between density and viscosity?
Answer:There is no relationship between the viscosity and density of a fluid. While viscosity is the thickness or thinness of a fluid, density refers to the space between its particles. However, both properties are affected by temperature. When a fluid is heated, its particles move far apart, and it also becomes less viscous.
Fluorine has seven electrons in its outermost shell. It will most likely try to join with an atom with _____.
seven electrons in its outermost shell
two electrons in its outermost shell
one electron in its outermost shell
eight electrons in its first shell
Answer:
Its either with itself to become fluoride Fl2 or with an alkali metal (elements in group 1) to achieve a stable electronic configuration or octet structure
Explanation:
ipt A wall that was once white is painted black. Which of the following is definitely true of the painted wall? A. Its chemical properties have changed. B. Its physical properties have changed. C. Both its physical properties and chemical properties have changed. D. None of its characteristic properties have changed.
Answer:
B It's physical properties changed
Explanation:
Because they painted the outside
You are given a sample of a Group II metal chloride, but the identity of the metal is unknown. Knowing that all Group II metal chloride compounds have the general formula, MCI2 and that the percentage of chlorine in the compound is 34.1%, what is the identity of the unknown substance?
Answer:
The identity of unknown substance is Barium.
Explanation:
The given compound has a formula of MCl2. And the percentage of chlorine in this compound is said to be 34.1 %. But, we know that the mass of chlorine in this compound is, 35.5*2 = 71 g
Therefore, if we let x be the total mass of the compound, then:
34.1% of x = 71 g
(0.341)x = 71 g
x = 71 g/0.341
x = 208.2 g
Hence, the mass of other atom M, must be:
M = x - 71 g
M = 208.2 g - 71 g
M = 137.2 g
Now, we look into periodic table in group II. We find that the element is Barium with atomic mass of 137 g.
The identity of unknown substance is Barium.
Barium forms a metal chloride whose percentage of chlorine is 34.1 %. The unknown substance is barium chloride.
We have a Group II metal chloride with a general formula MCl₂. The molar mass of Cl⁻ is 35.45 g/mol. The mass of 2 moles of Cl⁻ is:
[tex]2 mol Cl^{-} \times \frac{35.45g Cl^{-} }{1mol Cl^{-} } = 70.90g Cl^{-}[/tex]
70.90 g represents 34.1% of 1 mole of MCl₂. The molar mass of MCl₂ is:
[tex]70.90gCl^{-} \times \frac{100gMgCl_2}{34.1gCl^{-} } = 208gMgCl_2[/tex]
208 g of MCl₂ contains 70.90 g of Cl⁻. The mass of M²⁺ in 1 mole of MCl₂ is:
[tex]mMCl_2 = mCl^{-} + mM^{2+} \\\\mM^{2+} = mMCl_2 - mCl^{-} = 208g-70.9 g = 137.1 g[/tex]
Barium has a molar mass of 137.3 g/mol, so M must be barium. The unknown substance is barium chloride.
Barium forms a metal chloride whose percentage of chlorine is 34.1 %. The unknown substance is barium chloride.
Learn more: https://brainly.com/question/5394922
Of the atoms below, __________ is the most electronegative.
PLZ HELP I'LL AWARD BRINLIEST.
Hello sir, The answer that you are looking for is fluorine. Fluorine is the most electronegative atom. I am also sorry for calling you sir. I didn't know you were a woman.
Which is the best definition of nonpolar covalent bond?
Answer:
It is one of the covalent bonds in which the electrons are shared equally; therefore, dipole moment exists between the atoms in a molecule and there is no charge separation between the atoms in a molecule.
Answer: A covalent bond in which the electrons are shared equally
Explanation:
A P E X
Consider an isolated system (no heat, matter, work exchange with the environment) consisting of three internal compartments: A on the left, B in the center, and C on the right.Initially the central volume B is filled with an ideal gas at 298K andtheothertwo are empty. Consider the following two processes:a.The valve to the A side is opened, the gas expands freely into compartment A, and the system comesto equilibrium. Then, the valve to the C compartment is opened, and the system comes to equilibrium. b.Both valves are opened simultaneously, the gas expands freely into both compartments, and the system comes to its equilibrium. Which process produces more entropy
Answer:
Both processes produce equal entropy
Explanation:
Three compartments : A , B , C
A to the left, B in center, C on the right
compartment B is filled at 298 k while A and C is empty
The process that produces more entropy is: both processes and this is because the system is an isolated system with no heat matter and work exchange with the environment. and also entropy is independent of the path a process follows so either valve been open does not affect the entropy in the system because the change in the internal energy of an isolated system = 0
The skeletal structure in line-angle (line-bond) mode of 2,3,3,5-tetramethylhexane is shown. Identify the number of hydrogen atoms bound to each carbon atom in the structure.
Answer:
There are 22 hydrogen in 2,3,3,5-tetramethylhexane (C10H22)
From the left to the right of the skeletal structure:
1st Main Carbon = 3 hydrogen
2nd Main Carbon = 1 hydrogen
1st Branch Carbon = 3 hydrogen
3rd Main Carbon = 2 hydrogen
2nd Branch Carbon = 3 hydrogen
3rd Branch Carbon = 3 hydrogen
4th Main Carbon = 0 hydrogen
4th Branch Carbon = 3 hydrogen
5th Main Carbon = 1 hydrogen
6th Main Carbon = 3 hydrogen
Total = 22 hydrogen
Explanation:
This is the skeletal formula for 2,3,3,5-tetramethylhexane - the 2D chemical structure. It is an organic compound. The carbon atoms in the structure are known as the carbon backbone. The hydrogen atoms are linked to the carbon backbone. This provides each carbon atom with four bonds.
What is the name of the molecular geometry (shape) for this Lewis structure?
Answer:
Trigonal Pyramidal
Explanation:
You have [tex]AX_3E_1[/tex] configuration which corresponds to a trigonal pyramidal structure.
Which characteristic BEST identifies a pure substance?
a. shape
b. texture
c. melting point
d. state of matter
Whoever helps I will give BRAINLIEST
Calculate the mass of aluminum that would have the same number of atoms as 6.35 g of cadmium
Answer:
1.62 g of Al contain the same number of atoms as 6.35 g of cadmium have.
Explanation:
Given data:
mass of cadmium = 6.35 g
Number of atoms of aluminum as 6.35 g cadmium contain = ?
Solution:
Number of moles of cadmium = 6.35 g/ 112.4 g/mol
Number of moles of cadmium = 0.06 mol
Number of atoms of cadmium:
1 mole = 6.022×10²³ atoms of cadmium
0.06 mol × 6.022×10²³ atoms of cadmium/ 1mol
0.36×10²³ atoms of cadmium
Number of atoms of Al:
Number of atoms of Al = 0.36×10²³ atoms
1 mole = 6.022×10²³ atoms
0.36×10²³ atoms × 1 mol /6.022×10²³ atoms
0.06 moles
Mass of aluminum:
Number of moles = mass/molar mass
0.06 mol = m/ 27 g/mol
m = 0.06 mol ×27 g/mol
m = 1.62 g
Thus, 1.62 g of Al contain the same number of atoms as 6.35 g of cadmium have.
can you guys match the words to the definitions for my science work on thermal energy please❤️?
Answer:
i dont feel like typin the whole definition so im jus gonna type the number with the word
1- temperature
2- laws of conservation of energy
3- boiling point
4- freezing point
5- joule
6- thermal energy
7- heat
8- solid
9- liquid
10- gas
Answer:
hey guys
Explanation:
hope this helps you to do something good
Which has the lowest pH?
water
baking soda
bleach vinegar
Answer:
c. baking soda
Explanation:
What is the chemical name for LiC2H3O2 or C2H3O2Li
Answer:
AWAWDWDAD
Explanation:
Solve. C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g)
What is the Enthalpy of reaction?
What is the total Enthalpy of Reactants and Products? (Kj/Mol)
Is this a endothermic or exothermic reaction?
Answer: hope this helps!
Explanation:
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, the enthalpy of reaction is -2219.9KJ/mol and the reaction is exothermic reaction.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
C[tex]_3[/tex]H[tex]_8[/tex](g) + 5O[tex]_2[/tex](g) [tex]\rightarrow[/tex]3CO[tex]_2[/tex](g) + 4H[tex]_2[/tex]O(g)
Mathematically, the formula for enthalpy of a reaction can be given as
ΔH for reaction= 3 ×ΔH of CO[tex]_2[/tex] + 4 ×ΔH of H[tex]_2[/tex]O- ΔH of C[tex]_3[/tex]H[tex]_8[/tex]+ 5 ×ΔH of O[tex]_2[/tex]
= 3 ×393.5KJ/mol+ 4 ×285.8- 103.8+ 5 ×0
=-2219.9KJ/mol
The enthalpy of reaction is -2219.9KJ/mol. since the value of enthalpy has negative sign, the reaction is exothermic reaction.
Therefore, the enthalpy of reaction is -2219.9KJ/mol and the reaction is exothermic reaction.
To know more about enthalpy, here:
https://brainly.com/question/24170335
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CHOOSE ALL THE ANSWERS THAT APPLY. Which of the following equations are balanced?
O 2Fe + Cu(NO 3) 2 → 2Cu + Fe(NO 3) 2
O 2K + 2H 2O → H 2 + 2KOH
O Li + Cl 2 → LiCl
O 2H 2 + O 2 → 2H 2O
O 2S + 3O 2 → 2SO 3
Answer:
#2, 4, & 5
Explanation:
In number 1 there are unequal Cu's
In number 3 there are unequal Cl's
Answer:
B,D,E
Explanation:
What happens during a chemical reaction? Where do the reactants go, and where do the products come from?
Why don't solids, liquids, and gases leave Earth's atmosphere? A) Only gases can leave the atmosphere. B) Matter on Earth is destroyed and recycled. C) Gravity keeps all matter on Earth.
Answer:
The answer is C) Gravity keeps all matter on Earth.
Explanation:
I took the test and this was correct!
(Not a fake answer like some, I promise!)
Which of the following shows the abbreviation for an Sl unit of density?
A. L/kg
B. g/mL
C.
g/cm
D. kg/m2
Explanation:
ur answer okkkkkkkkkkkkkkkkll
What does Prokaryotic have that other cells does not
Answer:
Prokaryotes are unicellular organisms that lack membrane-bound structures, the most noteworthy of which is the nucleus. ... While prokaryotic cells do not have membrane-bound structures, they do have distinct cellular regions. In prokaryotic cells, DNA bundles together in a region called the nucleoid.
Cl2 is a stable diatomic molecule. It can be decomposed to form two Cl atoms as
shown below.
Cl2 → 2Cl(9)
Predict the change in enthalpy (AH) of this reaction.
A) AH is (-); endothermic
B) AH is (+); endothermic
C) AH is (-); exothermic
D) AH is (+); exothermic
E) AH = 0; thermoneutral
Answer:
Option B: ΔH is (+); endothermic
Explanation:
From the reaction Cl2 → 2Cl(g) given, we can see that the number of moles on the left hand side is 1 while on right hand side, it is 2. This means the number of moles are increasing and it means that the randomness of the system has increased. Also, the bonds are being broken down.
Therefore, the reaction is endothermic. In endothermic reactions, ΔH is positive.
Thus, the correct option is option B.
Answer:
b
Explanation:
ah