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
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
If you have a 17% salt solution, how much salt will need to be added to 71 mL of water?
Salt added : 14.5 g
Further explanationGiven
17% salt solution
71 ml water
Required
salt needed
Solution
%mass = (mass solute : mass solution) x 100%
71 ml water = 71 g water(density = 1 g/ml)
mass solute = x
[tex]\tt 17\%=\dfrac{x}{x+71}\times 100\%\\\\0.17(x+71)=x\\\\0.17x+12.07=x\\\\0.83x=12.07\\\\x=14.5[/tex]
After the nuclear plant in Japan failed in 2011, nuclear waste was released into the surrounding groundwater and ocean. How did this impact the surrounding human population?
A)The nuclear waste leaked into the ground and stayed in that location, affecting only humans who farmed or otherwise disturbed the soil.
B)The nuclear waste was not radioactive; therefore it did not affect the human population
C) The nuclear waste leaked into groundwater, and exposed humans to radiation that could potentially cause cancer.
D)The nuclear waste leaked into the sea and affected those exposed to seawater, but did not affect those on land
Answer:
C) The nuclear waste leaked into groundwater, and exposed humans to radiation that could potentially cause cancer.
Explanation:
your welcome girlies <33
The nuclear waste leaking into groundwater and exposing humans to radiation was how nuclear plant impacted the human population.
What is Nuclear plant?This is referred to a thermal power station in which the heat source is a nuclear reactor with radioactive elements.
The waste leaked into groundwater, and exposed humans to radiation that could potentially cause cancer which was how it affected the surrounding human population and why option C was chosen.
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Hexane burns in air to form carbon dioxide and water. The oxygen is store at 40.0 Celsius and at a pressure of 106.6kPa. How many moles of oxygen will react with 500. Grams of hexane
Answer: 55.233 moles of oxygen will react with 500 g of hexane.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Given mass of hexane = 500g
Molar mass of hexane = 86 g/mol
Putting values in above equation, we get:
[tex]\text{Moles of hexane}=\frac{500g}{86g/mol}\\\\\text{Moles of hexane}=5.814mol[/tex]
The chemical equation for the reaction of burning of hexane in air follows:
[tex]2C_6H_{14}+19O_2\rightarrow 12CO_2+14H_2O[/tex]
By stoichiometry of the reaction:
2 moles of hexane reacts with 19 moles of oxygen
So, 5.814 moles of hexane will react with = [tex]\frac{19}{2}\times 5.814=55.233moles[/tex] of oxygen
Hence, 55.233 moles of oxygen will react with 500 g of hexane.
Limestone CaCo3 decomposes to lime according to the equation below
CaCo3 ----> CaO + CO2
(i) balance the equation above
(ii) what mass of limestone would produce 11.2 grams of lime?
Show your working
Answer:
Mass of lime produced = 19.0 g
Explanation:
Given data:
Mass of lime produced = 11.2 g
Mass of limestone react = ?
Solution:
Chemical equation:
CaCO₃ → CaO + CO₂
Balanced chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of lime:
Number of moles = mass / molar mass
Molar mass of lime 56.1 g/mol
Number of moles = 11.2 g/ 56.1 g/mol
Number of moles = 0.19 mol
Now we will compare the moles of CaO and CaCO₃ from balance chemical equation.
CaO : CaCO₃
1 : 1
0.19 : 0.19
Mass of limestone react:
Mass = number of moles × molar mass
Mass = 0.19 mol × 100.1 g/mol
Mass = 19.0 g
i am so confused
How are Salts formed ?
a) by the covalent bonding of neutral atoms
b) by the covalent bonding of oppositely charged ions
c) by the iconic bonding of a cation and an anion
d) by intermolecular hydrogen bonding
please get me the right answer
Answer:
I think is answer B
but you can chek
Answer:
C
Explanation:
All salts are ionic compounds. Think about NaCl. Na+ is a cation and Cl- is an anion. NaCl form an ionic compound and are then considered a salt.
What chemical bonds occur to get oxygen?
Explanation:
covalent bonds
Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell.
What is the average speed of a cheetah that runs 9 km in 10 minutes?
Answer:
0.9m/s
hope it helps....
what compound would form when magnesium and nitrogen combine
Answer:
magnesium nitride
Explanation:
Which element, Sulfur or Chlorine, would have the higher first ionization energy?
Answer:
Chlorine
Explanation:
Answer:
Chlorine
Explanation:
The first Ionization energy for sodium is one and one-half times larger than the electron affinity for Chlorine. Thus, it takes more energy to remove an electron from a neutral sodium atom than is given off when the electron is picked up by a neutral chlorins atom.
why is the
equilibrium state considered dynamic ?
Answer:
Dynamic equilibrium only occurs in reversible reactions, and it's when the rate of the forward reaction is equal to the rate of the reverse reaction. These equations are dynamic because the forward and reverse reactions are still occurring, but the two rates are equal and unchanging, so they're also at equilibrium.
Answer:
By IdowShadow the cool man
Explanation:
Dynamic equilibrium only occurs in reversible reactions, and it's when the rate of the forward reaction is equal to the rate of the reverse reaction. These equations are dynamic because the forward and reverse reactions are still occurring, but the two rates are equal and unchanging, so they're also at equilibrium
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.
Learn more about forces of attraction,here:
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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
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
Which properties of alkaline earth metals decrease going down group 2?
Answer:
Ionization energy
Electron affinity
Electronegativity
Explanation:
a,b,c, or d?
(will give brainliest)
Answer:
b
Explanation:
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.
Which of the following is a unit of distance? JUst know im not dum nor slow.....just know.
min
miles/hr
hr
km
Answer:
km
Explanation:
Answer:
miles yryryeyeueheueueueueueyeyeyeyey
what 3 pieces of evidence did wegener use to support his theory
CAN SOMEONE PLEASE HELP ME?!
what is the formulaa for H2O
Answer:
:)
Explanation:
Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.
Answer:
H2O
Explanation:
Thats the formula :P
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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Jackson enjoys looking up at the night sky and writing about the variety of objects he see , on one special occasion he wrote in his journey that he saw a streak of light going across part of the sky . Which answer best describes what Jackson saw ?
a - Meteorite: A cold mixture of dust and ice that develops a long tail as it nears the sun
b - Meteor: A cold mixture of dust and ice that develops a long tail as it nears the sun
c - Meteorite: A streak of light made when an object burns up as it enters earth’s atmosphere
d - Meteor: A streak of light made when an object burns up as it enters earth’s atmosphere
Answer:
d - Meteor: A streak of light made when an object burns up as it enters earth’s atmosphere
Explanation:
The best description of what Jackson saw is a meteor which is a streak of light made when an object burns up as it enters earth's atmosphere.
A meteor is made up of rocky and sometime iron mass. They are believed to have formed since the early formation of the earth.
These objects moves with very high velocity in the solar system. When they enter the earth's atmosphere, they are burnt up and they leave a streak of light in the atmosphere. This is what is seen as a shooting starPlease help!!!! The question is down below!
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.
The internal combustion engine takes advantage of the ability of the combustion reaction of gasoline to do _______ and move a piston up and down.
A. free energy
B. enthalpy
C. work
D. entropy
PLS HELP ASAP THANK YOU!!!
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]
Step 5: Measuring the Volume of Air Near 20°C (Room Temperature) temperature of gas height of the column of gas
1. Temp of gas: 3C Height of the column of gas: 6.2cm
2. Temp of gas: 294K Volume of gas: 0.78cm3
Answer:
1. Temp of gas 21C, 6.2
2.Temp of gas 294, Volume of gas 0.78cm3
Explanation:
Just answered on Edge
Answer:
picture
Explanation:
edge 2021
Need help please can someone do these willing to give brainiest!
Explanation:
a) K(s) + I2(s) --> KI(s)
The balanced equation is;
2K(s) + I2(s) --> 2KI(s)
b) Mg(s) + Br2(l) --> MgBr2(s)
The balanced equation is;
Mg(s) + Br2(l) --> MgBr2(s)
c) KBr(aq) + AgNO3(aq) --> KNO3(aq) + AgBr(s)
The balanced equation is;
KBr(aq) + AgNO3(aq) --> KNO3(aq) + AgBr(s)
d) KClO3(s) --> KCl(s) + O2(g)
The balanced equation is;
2KClO3(s) --> 2KCl(s) + 3O2(g)
e) C2H6(g) + O2(g) --> CO2(g) + H2O(l)
The balanced equation is;
2C2H6(g) + 7O2(g) --> 4CO2(g) + 6H2O(l)
f) Al(s) + O2(g) --> Al2O3(s)
The balanced equation is;
4Al(s) + 3O2(g) --> 2Al2O3(s)
g) P4(s) + H2(g) --> PH3(g)
The balanced equation is;
P4(s) + 6H2(g) --> 4PH3(g)
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).