4AI + 302 — 2Al2O3
In this reaction, how many grams of O2 are required to
completely react with 110 grams of Al?
Answer:
Mass = 96 g
Explanation:
Given data:
Mass of oxygen required = ?
mass of Al = 110 g
Solution:
Chemical equation:
4Al + 3O₂ → 2Al₂O₃
Number of moles of Al:
Number of moles = mass/molar mass
Number of moles = 110 g/ 27 g/mol
Number of moles = 4 mol
Now we will compare the moles of Al and oxygen.
Al : O₂
4 : 3
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 3 mol × 32 g/mol
Mass = 96 g
Calculate the pH of a solution with [H+]= 1 x 10^-11
11
3
13
14
Answer: Option (a) is the correct answer.
Explanation:
pH is the negative logarithm of concentration of hydrogen ion.
That is, pH = -log [tex][H^+][/tex]
Hence, pH of solution with [tex][H^+] = 1 \times 10^{-11}[/tex] is calculated as follows.
pH = -log [tex][H^+][/tex]
= -log [tex](1 \times 10^-{11})[/tex]
= 11
Therefore, pH of solution with [tex][H^+] = 1 \times 10^{-11}[/tex] is 11.
In Rutherford's Gold foil experiment, were the alpha particles directed to different areas of the gold foil or only the same spot? If the same spot, how did the particles get deflected in different directions sometimes and go through most of the time
Answer:
See explanation
Explanation:
In the Rutherford experiment, alpha particles were directed at the same spot on a thin gold foil.
As the alpha particles hit the foil, most of the alpha particles went through the foil. In Rutherford's interpretation, most of the particles went through because the atom consisted largely of empty space.
However, some of the alpha particles were deflected through large angles, in Rutherford's interpretation, the deflected alpha particles had hit the dense positive core of the atom which he called the nucleus.
This accounted for their scattering through large angles throughout the foil in all directions.
What was the great physical event that took place at the end of the Mesozoic era in
North America?
Rocky Mountains formed.
First oceans formed
O Mount Saint Helens erupted.
Grand Canyon formed.
Answer:
Mount Saint Helens erupted
Which of the following statements describes what happens as you rub your
hands together?
A. Matter is transferred from one hand to the other.
B. Kinetic energy is converted to heat energy.
C. Perfectly efficient energy transfer occurs.
a
D. Perpetual motion begins.
The statement that describes what happens as you rub your hands together is Kinetic energy is converted to heat energy. The correct option is B.
What is kinetic energy?Kinetic energy is the energy that is used when doing some work. It is possessed when an object is in motion. To move a body from its resting position to its motion position, kinetic energy is used. When a certain object moves with a certain speed, then it is maintaining its kinetic energy.
When someone is rubbing his hands, it means his hands are in motion, so kinetic energy is in use. Rubbing produced friction which produces heat, so the rubbing hands will convert the kinetic energy into heat energy.
Thus, the correct option is B. Kinetic energy is converted to heat energy.
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Which atom had the largest ionization energy 1) Na 2)cl 3)O 4)Se
Answer:
Na
Explanation:
Na Because it's exist in group 1
Answer:
la tabla de la derecha muestra una lista de los elementos ordenados por su energía de ionización. El elemento de mayor energía de ionización es el Helio, y el de menor el Cesio. La unidad de energía de ionización es el electrón voltio (eV).
What involves a metal and nonmetal ionic or covalent bond
Answer:
An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.
Chemical reactions yield ____
a) Products
b) Reagents
c) Reactants
d) All of the above
Answer:
products
Explanation:
chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.
Calcium carbonate, CaCO3 (also called calcite), is the principal mineral found in limestone, marble, chalk, pearls, and the shells of marine animals such as clams. A certain sample
of calcium carbonate contain 4.86 moles. What is the mass in grams of this sample?
Answer:
486 grams
Explanation:
No of moles = mass in gram / molar mass
Mass in gram = No of moles × molar mass
Molar mass of CaCO3 = 40+12+(16*3)
= 40+12+48 = 100 amu
Mass in gram = 4.86 × 100
Mass in gram 486 grams
The Big Bang theory is used to explain the origins of the universe. Why is this called a theory and NOT a law?
Answer:
It's called a theory because it has not been proven yet. so we can not claim it to be a fact without proof.
Answer: There is no concrete evidence.
Explanation: If we could do an experiment and create the Big Bang and watch it happen and study it, it would be law. It's for the same reason that evolution is considered a theory. We are not watching it take place and there is no eye witness account of evolution happening because evolution happens over millions and millions of years. If we could sit here and watch the universe be created without need for simulations or theories, then it would be law.
PLS ANSWER ASAP WILL GIVE BRAINIEST
Chlorine gas is produced by the reaction: 2 HCl --> H2 + Cl2
How many moles of HCl must react to produce 10.0 L of chlorine gas at STP?
Answer:
i believe its 1.56
Explanation:
At room temperature, the greatest attractive forces exist between particles of
A. a solid
B. a gas
C. a liquid
Answer:
Solid
Explanation:
because their molecules are tightly packed.
According to the forces of attraction, at room temperature, the greatest attractive forces exist between particles of a solid.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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The combustion reaction for methane is shown below:
CH4 (9) + 2O2 (g) → CO2 (g) + 2H20 (9) + energy
If 64.0 g of methane is reacted with excess oxygen gas, what is
the pressure exerted by water vapor assuming the reaction
went to completion in a 24.0 L engine at 515 K?
Answer:
P = 14.1 atm
Explanation:
Given data:
Mass of methane = 64 g
pressure exerted by water vapors = ?
Volume of engine = 24.0 L
Temperature = 515 K
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O + energy
Number of moles of methane:
Number of moles = mass / molar mass
number of moles = 64 g/ 16 g/mol
Number of moles = 4 mol
Now we will compare the moles of water vapors and methane.
CH₄ : H₂O
1 : 2
4 : 2/1×4 = 8 mol
Pressure of water vapors:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
P = 8 mol × 0.0821 atm.L/mol.K× 515 K / 24.0 L
P = 338.25 atm.L/ / 24.0 L
P = 14.1 atm
Will give brainliest! What is the balanced equation for Mg+O2?
I got:
Mg+O2 -> MgO2
2Mg+O2 -> 2MGO
Both may or may not be right so if its neither please put the correct answer. Thanks!
Answer:
2Mg+O2 = 2MgO is the balanced equation of this reaction. When Mg +O2 reacts MgO is formed. The number of atoms of each element on reactant and product side must be equal
Explanation:
Ur welcome
Answer:
2Mg+O2 ⇒ 2MgO
A sample of radium-226 will decay to ¼ of its original amount after 3200 years. What is the half-life of radium-226? _______years
Answer:
t(half-life) = 1600 yrs
Explanation:
All radio decay follows 1st order kinetics and therefore can be applied to the expression A = A₀e^(-kt)
A = current activity
A₀ = initial activity
k = decay constant
t = time of decay
Half-Life = 0.693/k
k = ln(A/A₀) / -t = ln(0.25) / -3200yrs = 4.33x 10⁻⁴ yrs⁻¹
Half-Life => t(1/2) = (0.693/4.33 x 10⁻⁴)yrs⁻¹ = 1600 yrs.
Please help ASAP!
Explain how to find the combining ratio and chemical formula between the following pairs of elements using the periodic table:
-Rubidium and sulfur
-Sodium and oxygen
Please explain your answer and dont answer if you dont know
Explanation:
Rubidium is in Group 1 and exists as Rb+ ions.
Sulfur is in Group 16 and exists as S2- ions.
To form a compound containing rubidium and sulfur, the charges of the ions must be equal.
Therefore there are 2 rubidium and 1 sulfur atoms.
=> Chemical formula is Rb2S.
Sodium is also in Group 1 and exists as Na+ ions.
Oxygen is also in Group 16 and exists as O2- ions.
Therefore there are 2 sodium and 1 oxygen atoms.
=> Chemical formula is Na2O.
The chemical formula of the compounds form are as follows;
For Rubidium and sulfur; Rb2SFor Sodium and oxygen; Na20Discussion:
Rubidium, Rb is in Group 1 and ionises as Rb+ ions.Sulfur, S is in Group 16 and ionises as S2- ions.To form a compound between rubidium and sulfur, the net charge must be zero
As a result, we need 2 rubidium and 1 sulfur atoms.
Chemical formula is therefore; Rb2S.Similarly, Sodium, Na is in Group 1 and ionises as Na+ ions.
Oxygen, O is in Group 16 and ionises as O2- ions.
To form a compound between Sodium and Oxygen, the net charge must be zero
As a result, we need 2 Sodium and 1 Oxygen atoms.
Chemical formula is therefore; Na2O.Read more:
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A relationship where one organism benefits and the other organism is harmed is called?
Answer:
Parasitism. A symbiotic relationship between two species in which one benefits and the other is harmed.
Explanation:
:)
I need help, thank you.
Answer:
B
Explanation:
hope this helps :)
PLEASE HELP MEEEE!!!!
1. 18 L
2. 20.832 L
Further explanationGiven
Combustion of ethane
Required
Volume of CO₂
Solution
Avogadro's Law :
In the same T,P and V, the gas contains the same number of molecules
So the ratio of gas volume will be equal to the ratio of gas moles
V₁/n₁=V₂/n₂
1. From equation, mol ratio of C₂H₆ : CO₂ ⇒ 2 : 6
so the volume of CO₂ :
= 6/2 x 6 L
= 18 L
2. mol ethane (MW=32 g/mol) :
= mass : MW
= 10 g : 32 g/mol
= 0.31
mol CO₂ :
= 6/2 x 0.31
= 0.93
The volume CO₂(assume at STP) = 20.832 L
Say I grab a bunch of aluminum foil (9.5g) and ball it up. Aluminum has a specific heat of .9J/g*C. How much would the aluminum’s temperature change if I added 67Joules of energy (Q) to it?
Answer:
ΔT = 0.78 °C
Explanation:
Given data:
Mass of Al = 9.5 g
Specific heat capacity of Al = 0.9 J/g.°C
Temperature change = ?
Heat added = 67 J
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
67 J = 9.5 g × 0.9 j/g.°C × ΔT
67 J = 85.5 j/°C × ΔT
ΔT = 67 J / 85.5 j/°C
ΔT = 0.78 °C
During the formation of the compound sodium chloride, the correct symbol and charge for each of the ions must be...
O Na+1 and Cl-1
O Na+1 and F-1
O Na+1 and Br-1
O Na+1 and O-2
Answer: The correct answer is option A. [tex]Na^+\text{ and }Cl^-[/tex]
Explanation:
An ionic compound is defined as the compound formed by the complete transfer of electrons from one element (forming cation) to another element (forming anion)
Sodium (Na) is an element having atomic number 11 and its electronic configuration is [tex]1s^22s^22p^63s^1[/tex]
It will loose 1 electron to form [tex]Na^+[/tex] ion (cation)
Chlorine (Cl) is an element having atomic number 17 and its electronic configuration is [tex]1s^22s^22p^63s^23p^5[/tex]
It will gain 1 electron to form [tex]Cl^-[/tex] ion (anion)
The ionic compound so formed will have the chemical formula of NaCl.
Hence, the correct answer is option A. [tex]Na^+\text{ and }Cl^-[/tex]
Balance this chemical equation
Answer:
the chemical equation is balanced ❤
How many meters did a car travel if it went 65mi/hr for 4.5 hours?
Answer:
292.5
Explanation:
65x4=260
65 divded by 2 = 32.5
260+32.5=292.5
What is the percent composition of Fluorine in CF5?
a,b,c, or d?
(will give brainliest)
Answer:
b
Explanation:
CAN SOMEONE PLEASE HELP ME?!
help i am using all my points on thisss will mark brainliest
1 sodium bromide
2 scandium
3 aluminium selenide
4 sodium fluoride
5 potassium chloride
6 strontium fluoride
7 magnesium bromide
8 sodium oxide
9 lithium oxide
10
11 lithium fluoride
12 calcium bromide
13 methyl beta-d-glucopyeanoside
14
15sodium chloride and 16 sodium nitrate
(hope it helped) ❄️❄️❄️
Question 1:
In photosynthesis what is used to convert water and carbon dioxide into glucose and oxygen?
carbonated water
heat energy from the sun
light energy from the sun
nutrients from decomposers
Question 2: Which term refers to microscopic plants?
consumers
copepod
phytoplankton
zooplankton
Question 3:
Which organism is a kind of phytoplankton?
algae
sea butterfly
copepod
lion’s mane jellyfish
-
please help!! and try and answer them all, not just one!
Answer:
Answer 1
light energy from the sun.
answer 2
Microscopic organisms are tiny life forms, often consisting of a single cell. ... Algae — these are single celled plants also known as phytoplankton (from the Greek, meaning drifting plants)
answer 3
Some phytoplankton are bacteria, some are protists, and most are single-celled plants. Among the common kinds are cyanobacteria, silica-encased diatoms, dinoflagellates, green algae, and chalk-coated coccolithophore
Explanation:
it uses light to convert water and carbon dioxide molecules into glucose (sugar molecule) and oxygen
MS (R) Science 7 Q3 20-21
Which statements describe molecules? Check all that apply.
Molecules are made of two or more atoms.
Molecules are all the same size
Molecules range in size.
Molecules are only made of atoms of the same element.
Molecules are only made of atoms of different elements.
Molecules are made of atoms of the same element or different elements.
Answer:
Molecules are made of two or more atoms
Molecules are made of atoms of the same element or different elements.
Molecules range in size.
Explanation:
A molecule is formed whenever two or more atoms combine. Hence we can define a molecule as a combination of two or more elements that are combined chemically and can not be separated by any physical means.
Molecules may be composed of the same atoms as in O2, F2 etc or different atoms as in CO2, H2O, etc.
The sizes of molecules differ. Some molecules are quite small in size while others are quite large in size.
Answer:
Molecules are made of two or more atoms
Molecules range in size
Molecules are made of atoms of the same element or different elements.
Which properties of alkaline earth metals decrease going down group 2?
Answer:
Ionization energy
Electron affinity
Electronegativity
Explanation: