Answers
Answer:
Combustion
Explanation:
Naphthalene
The burning of naphthalene is one of the more well known school experiments for combustion reactions. This is because naphthalene combustion involves a simple burning reaction which involves simple burning procedures. The reaction involved is represented by the reaction equation: C10H8 + 12 O2 → 10 CO2 + 4 H2O + energy.
In layman's terms, Naphthalene plus oxygen will burn, and produce carbon dioxide and water. This exothermic reaction that involves releasing heat in the form flame and also produces carbon dioxide gas.
Related Questions
the difference between Ionic and Covalent bonding.
Answers
i need help with these. its balancing. the blank spaces are where u put the numbers. and the stuff on the sidd is how u show work. i got lost and dont know what comes next
Answers
8. 4,3,1
9. 1,4,1,2
10. 3,4,1,4
Round off 45.68 metres to one decimal place.
Answers
You look at the 2nd number after the decimal and judge whether it is above or below 5. In this case it is 8, so you round up the number before by 1 digit.
The answer: 45.7 metres
Answer:
45.7
Explanation:
Because if the number 1-4 then it goes down and if it 5-9 then it goes up
How many strontium atoms would have a mass of 1.45 grams ?
Answers
How much current is drawn by a 40-W bulb in a 120-V circuit?
Answers
*Fill in the blank about the periodic table*
Atomic number equals the number of ______ or ______
Atomic mass equals the number of _____ + ______
Answers
Atomic number equals the number of protons or electrons. Atomic mass equals the number of protons and neutrons
Neeeeeeeedddddd hellllllllllppppppp
Answers
4. Which type of bond will form between a calcium atom and a sulfur atom?
Answers
Answer:ionic
Explanation: ionic bond formation
In the ionic bond formation between calcium and sulfur, a calcium atom donates two valence electrons to a sulfur atom to form a Ca2+ ion and an S2+ ⁻ ion.
What is a quantum of energy?
Answers
Answer:
In chemistry and physics, quantum refers to a single packet of matter or energy. In practical use, it refers to the minimum amount of energy required for a change or the minimum value of any physical property in an interaction. Quantum is the singular form of the word. Quanta is the plural form of the term.
Explanation:
Answer:
quantum of energy
Explanation:
The term quantum of energy means that the energy is not transferred continuously but as discrete packets of energy. Amount of energy required to move an electron from one energy level to another. The amount of energy an electron gains or loses is. Not always the same. The higher energy levels are.
hope it helps!
How many moles of oxygen are needed for the complete combustion of 29.2 grams of acetylene?
Answers
Moles of Oxygen= 2.8075 moles
Further explanationGiven
29.2 grams of acetylene
Required
moles of Oxygen
Solution
Reaction(Combustion of Acetylene) :
2 C₂H₂ (g) + 5 O₂ (g) ⇒ 4CO₂ (g) + 2H₂O (g)
Mol of Acetylene :
= mass : MW Acetylene
= 29.2 g : 26 g/mol
= 1.123
From equation, mol ratio of Acetylene(C₂H₂) : O₂ = 2 : 5, so mol O₂ :
= 5/2 x mol C₂H₂
= 5/2 x 1.123
= 2.8075 moles
A car emits 411g of carbon dioxide gas in 1 mile of driving. How many liters of carbon dioxide emit at STP?
Answers
The volume of Carbon dioxide at STP = 209.22 L
Further explanationGiven
411g of Carbon dioxide gas
Required
The volume of Carbon dioxide
Solution
mol of Carbon dioxide :
= mass : MW CO₂
= 411 g : 44 g/mol
= 9.34
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.
So for 9.34 mol :
= 9.34 x 22.4 L
= 209.22 L
How are earthquakes, volcanoes, and tsunamis related to the ring of fire?
Answers
Answer:
they are not................
Answer: The abundance of volcanoes and earthquakes along the Ring of Fire is caused by the amount of movement of tectonic plates in the area. Along much of the Ring of Fire, plates overlap at convergent boundaries called subduction zones. That is, the plate that is underneath is pushed down, or subducted, by the plate above
Explanation:
Explain how scientists use balanced chemical equations and molar mass concepts to represent reactions and account for the amount of substances.
Answers
Explanation:
Scientists most especially chemists use the mole concepts through balanced chemical equations and molar masses to represent chemical reactions and account for the amount of substances.
The mole concept entails finding molar relationships between reactants and products in a chemical reaction. Mole connects difference chemical parameters and it is used in quantitative analysis of chemical reaction.
First, we work from the known to the unknown. The known is the specie whose mass or number of moles is given.Number of moles = [tex]\frac{mass}{molar mass}[/tex]
After obtaining the number of moles, then go ahead to compared using the balanced reaction with that of the unknown. Then from them find the mass of the unknown.Bill is pushing a box with 10 N of force to the left, while Alice is pushing the box with 30 N of force to the right. What is the net force?
Answers
Answer:
Fnet = 20 Newton
Explanation:
Let the force applied by Brian be Fb.
Let the force applied by Alice be Fa.
Given the following data;
Force, Fb = 10N
Force, Fa = 30N
To find the net force, Fnet;
Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.
Mathematically, net force is given by the formula;
[tex] Fnet = Fapp + Fg[/tex]
Where;
Fnet is the net force Fapp is the applied forceFg is the force due to gravitationSince the two force applied to the box are acting in opposite direction, we would subtract their values to find the net force.
Fnet = Fa - Fb
Fnet = 30 - 10
Fnet = 20 Newton
C.
[2]
Name another chemical which can be used to test for the present of water and state the
colour change.
Answers
Answer:
See explanation
Explanation:
There are two chemicals commonly used to test for water. They are;
CuSO4: Anhydrous CuSO4 is white in colour, when it absorbs moisture, its colour changes from white to blue.
CoCl2: Anhydrous CoCl2 is blue in colour. when it absorbs moisture, its colour changes from blue to pink.
Reasons
4
4
K
Glven: N is the midpoint of JL;
N is the midpoint of KM;
JL = KM
N
Prove: KN = NL
M
Statements
Reasons
1.
N is the midpoint of JL;
N is the midpoint of KM;
JL = KM
1. Given
2.
JN = NL;
KN = NM
2.
3.
3. Segment Addition Postulate
4. KN + NM = JL
4.
5.
5. Transitive Property
6. KN + KN = NL + NL
6.
7.
7. Simplify
8. KN = NL
8.
Gina Wilson (All Things Algebra). 20
Answers
Answer:
(1) The two column proof is presented here as follows;
Statement [tex]{}[/tex] Reasons
1. C is the midpoint of [tex]\overline {AE}[/tex] [tex]{}[/tex] Given
B is the midpoint of [tex]\overline {AC}[/tex] [tex]{}[/tex]
D is the midpoint of [tex]\overline {CE}[/tex] [tex]{}[/tex]
2. AC = CE, AB = BC, CD = DE [tex]{}[/tex] Definition of midpoint
3. AB + BC = AC, CD + DE = CE [tex]{}[/tex] Segment addition postulate
4. CD + DE = AC [tex]{}[/tex] Substitution property of equality
5. AB + BC = CD + DE [tex]{}[/tex] Substitution property of equality
6. BC + BC = CD + CD [tex]{}[/tex] Substitution property of equality
7. 2·BC = 2·CD [tex]{}[/tex] Addition of two identical quantities
8. BC = CD [tex]{}[/tex] Division property of equality
9. BC ≅ CD [tex]{}[/tex] Definition of Congruence
(2) The two column proof for the triangular geometric figure is presented here as follows;
Statement [tex]{}[/tex] Reasons
1. 2·WV = XY; 2·YZ = XW; WV = YZ [tex]{}[/tex] Given
2. 2·WV = 2·YZ [tex]{}[/tex] Multiplication property
3. XY = XW [tex]{}[/tex] Substitution Property
4. XW + WV = XV [tex]{}[/tex] Segment Addition Property
XY + YZ = XZ
5. XW + WV = XV [tex]{}[/tex] Substitution Property
XW + WV = XZ
6. XV = XZ [tex]{}[/tex] Substitution Property
Explanation:
Which kind of molecular shape will this molecule have? H-S-H
Answers
Answer:
the molecule is formed by covalent bond , and each hydrogen atom forms a single bond with sulphur atom.
calculate the quantity of electricity obtained from 2 moles of electrons
Answers
The quantity of electricity : 2 Faraday = 193000 Coulomb
Further explanationGiven
2 moles of electrons
Required
The quantity of electricity
Solution
According to Faraday, the amount of current flowing in the electrolysis cell is closely related to the amount of substance that reacts
1 Faraday is the amount of electricity that is passed in the electrolysis cell to obtain 1 mole of electrons. 1 mole of electrons is equivalent to an electric charge of 96500 Coulombs.
The conversion / relationship can be stated as follows:
1 Faraday = 1 mole of electrons = 96500 Coulombs
1 faraday = coulomb / 96500
Can be formulated
Coulomb = Q = I. t so:
[tex]\large {\boxed {\bold {1 \: Faraday \: = \: \dfrac {i \: x \: t} {96500}}}}[/tex]
so for 2 moles electrons :
= 2 x 96500 C
= 193000 C
= 2 Faraday
What makes a pure substance different from a heterogeneous mixture? (4 points)
Answers
Explanation:
Pure substances are elements and compounds. These substances have the following properties:
All parts are the same throughout which implies that they are homogeneous. They have a definite composition. They cannot be easily separated or broken down into simpler substances by physical meansSeparation by physical means is not possible They have unique sets of physical properties.Heterogeneous mixtures have completely opposite properties as the pure substances as given above.
Plz help me with is thank you
A.4.0m/s
B.4.8m/s
C.5.6m/s
D.6.4m/s
Answers
I JUST NEED HELP!!!! ASAP!!!!
Hydrogen cyanide has the chemical formula HCN. What's the formal charge on the N atom?
A)
+2
B)
0
C)
–2
D)
–1
Answers
Answer:
Formal charge = valance electron - nonbonding electron - (1/2)bonded electron
For nitrogen atom,
Formal charge = 5 - 2 - (1/2)×6
= 5-2-3
= 0
So, the formal charge on nitrogen atom in HCN is "0".
Explanation:
The formal charge on the N atom of hydrogen cyanide, HCN molecule is 0. Option B is correct.
Formal charge is defined as the individual charge of an atom. It is represented as:
Formal charge = valance electron - nonbonding electron - (1/2)bonded electron
The valence electrons in nitrogen atom is 5, there are 2 non bonding electrons and 6 bonded electrons on N atom in HCN,
Thus, For Hydrogen cyanide molecule, the formal charge on nitrogen atom is calculated as:
Formal charge
= 5 - 2 - (1/2)×6
= 5-2-3
= 0
So, the formal charge on nitrogen atom in HCN is "0".
To know more about formal charge here
https://brainly.com/question/2081051
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A gas with a volume of 2 L at 25°C is placed into a container that is 4 L. What is the new temperature of the gas?
Answers
Given :
A gas with a volume of 2 L at 25°C is placed into a container that is 4 L.
To Find :
The new temperature of the gas.
Solution :
Since, their is no information regarding pressure. We will assume that pressure is constant.
Now, we know when at constant pressure, volume is directly proportional to volume.
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\\dfrac{2}{4} = \dfrac{25 + 273 }{x}\\\\x = 2 \times ( 25 + 273 )\\\\x = 596\ K[/tex]
Therefore, the new temperature of the gas is 596 - 273 K = 323 K.
Can you help me please I’ll park u brainliest
Answers
Answer:
it is called the stigma you also might be able to look it up
6. Which example has BOTH ionic and covalent bonds? *
Answers
Answer:
It’s either A or D buttttt probably d
Explanation:
Can someone help me with this?
Answers
Answer:
Its Vog
Explanation:
I need help ASAP! I will mark brainiest to whoever is right .
Answers
Answer:
iwan loptop di ba yan isearch mo nalang
Explanation:
baka lang ka naman makakita ng swerte na aswers
Please help me, Thank you!
Answers
Answer:
Fe³⁺
Explanation:
When Fe²⁺ loses an electron, it becomes an Fe³⁺ ion.
The loss of an electron in an atom makes the atom becomes positively charged. Further losing electrons makes the atom more positive.
For the given ion;
Fe²⁺ if it loses an electron more, it becomes Fe³⁺.
The expression is given as:
Fe²⁺ → Fe³⁺ + e⁻
The asthenosphere is the part of the upper mantle just below the lithosphere that os involved in the plate tectonic movement anf isostatic adjustments during as the ice age
Answers
Answer:C
Explanation:
Answer:
It's B I promise you
Which statement would be true if glucagon secretion were permanently inhibited, resulting in negative feedback?
Blood glucose levels would decrease.
Glycogen formation would be inhibited.
Insulin production would decrease.
The synthesis of fat would decrease.
Answers
Answer:
Insulin production would decrease.
Explanation:
Insulin and Glucagon work together to balance the sugar levels in the human blood stream. They work together in a negative feedback loop. Glucagon stimulates the liver to release glucose into the bloodstream in a process known as glycogenolysis. Insulin on the other hand is a sugar-lowering hormone.
Therefore, if glucagon secretion were permanently inhibited, insulin production would decrease as there would not be excess blood sugar to be reduced.
Answer:
Insulin production would decrease.
Ducks and geese have small, fluffy feathers called "down."
How does down help these birds survive?
Answers
Answer:
it helps them fly (A)
Explanation:
Answer:
strengths wings?
Explanation:
If I'm right, please give brainliest?
