Answer:
Combustion
---
Answer:
This is not a redox reaction. It is an example of combustion.
Explanation:
Lab Scenario D:
Kostal & Stout students are in a competition to identify the reactants based on information they collected during a lab.
A metal was burned in a fire and light and heat were released. The crystals produced were identified as lithium oxide.
(2 points) Type of Reaction & Big Clue or Pattern:
(2 points) Balanced equation:
(2 points) Exothermic or Endothermic (include evidence from the scenario to support your answer):
(1 point) Activation Energy:
(1 point) Was a catalyst used (include evidence from the scenario to support your answer)?:
Answer:
See explanation
Explanation:
A reaction in which heat and light are produced is a combustion reaction. Combustion is said to have occurred when a substance is burnt in oxygen.
The balanced equation of the reaction is;
4Li(s) + O2(g) ------->2Li2O(s)
This reaction is exothermic because heat was produced. The reaction has a low activation energy as the metal easily burst into flames in oxygen. A catalyst is not needed in this reaction because it has a low activation energy.
According to the law of conservation of mass. Atoms are neither created nor destroyed in a chemical reaction. What this means is that in a chemical reaction, the number of atoms of each element on the left hand side must be the same as the same as the number of atoms of the same element on the right hand side.
Some atoms bond and others do not. What determines whether or not an
atom will bond with atoms of other elements?
please help
Write a balanced nuclear equation for the beta decay of Hg-202.
Answer:
²⁰²Hg₈₀ ----> ²⁰²Tl₈₁ + ⁰₋₁e
Explanation:
The radioactive decay of the atom of an element by the emission of a beta-particle is equivalent to the splitting of a neutron in the nucleus of the radioactive element into an electron and a proton. The proton is retained by the nucleus whereas the electron is emitted as a beta-particle. This retention of the proton results in an increase of the atomic number by 1. A beta-particle is an electron. The electron is a very light particle and its loss makes no significant change in the mass number of the atom involved.
The beta decay of Hg-202 results in an increase of the atomic number from 8-0 to 81. Hence, Hg-202 is transformed to Tl-202. the balanced nuclear equation is given below:
²⁰²Hg₈₀ ----> ²⁰²Tl₈₁ + ⁰₋₁e
if equal amounts of helium and argon are placed in a porous container and allowed to escape, which gas will escape faster and how much faster?
A: Argon is 3.16x faster
B: Helium is 0.316x faster
C: Argon is 0.316x faster
D: Helium is 3.16x faster
Answer:
B: Helium is 0.316x faster
If equal amounts of helium and argon are placed in a porous container and allowed to escape, helium will diffuse 3.16x faster than argon.
According to Graham's law of diffusion of gases, the rate of diffusion of a gas is inversely related to the square root of its molecular weight.
Mathematically, when two gases are being compared;
r1/r2 = √m2/√m1
Where r1 = diffusion rate of gas 1, r2 = difussion rate of gas 2, m1 = molar weight of gas 1, and m2 = molar weight of gas 2.
Molar weight of helium = 4
Molar weight of argon = 39.9
Hence,
r helium/r argon = √39.9/√4
= 6.317/2
= 3.16
Therefore, 3.16 x r argon = r helium.
In other words, helium will diffuse 3.16x faster than argon.
More on diffusion rate of gases can be found here: https://brainly.com/question/2967915
covert 1.57 x 10^14 nm= ___m
Answer:
1.57 x 10⁷m
Explanation:
Given quantity is;
1.57 x 10¹⁴nm
Now;
1 nm = 10⁻⁹
So, let us convert this given quantity;
1 nm = 10⁻⁹
1.57 x 10¹⁴nm will give 1.57 x 10¹⁴ x 10⁻⁹ = 1.57 x 10⁷m
in the carbon cycle what primary way that carbon is removed from the atmosphere??
Water and carbon dioxide are byproducts. Notice that photosynthesis and respiration are essentially the opposite of one another. Photosynthesis removes CO2 from the atmosphere and replaces it with O2. Respiration takes O2 from the atmosphere and replaces it with CO2.
Describe each layer of Earth’s current atmosphere below:
Answer:
exosphere thermosphere mesosphere stratosphere troposphere
What is the molarity of a solution in which 0.321 g of calcium chloride is dissolved in 1.45 L water?
Answer:
Molarity = 0.002 M
Explanation:
Given data:
Mass of calcium chloride = 0.321 g
Volume of water = 1.45 L
Molarity of solution = ?
Solution:
Molarity = number of moles / volume in litter.
We will calculate the number of moles of calcium chloride first.
Number of moles = mass/molar mass
Number of moles = 0.321 g/ 110.98 g/mol
Number of moles = 0.003 mol
Molarity:
Molarity = 0.003 mol / 1.45 L
Molarity = 0.002 M
Because the electrons have a slight negative charge, there is a slight negative charge near the ___________ atom; there is a slight __________ charge near the hydrogen atom.
Answer:
Oxygen and positive charge.
Explanation:
The value of electronegativities of oxygen is higher than hydrogen due to which a slight negative charge occur on its oxygen atom and a slight positive charge on its hydrogen atoms of water molecule. The water is polar in nature because oxygen attract the shared pair of electron that leads to partial negative charge on oxygen while on the other hand, the hydrogen atom has acquire partial positive charge.
What do these words mean ?
a) filtrate
b) residue
I will give him or her brilliant and thank you
I need small and right answer.
Answer:
a) filtrate: a liquid which has passed through a filter.
Explanation:
the other one didnt pop up
Which of the following tools was responsible for advancing our knowledge of cells over the past 400 years?
Answer:
I have no clue sorry
Explanation:
good luck
Which of the following is a chemical change? A. Baking brownies B. Combining eggs, sugar, and flour together to make cookie dough C. Crumpling a piece of paper D. Melting a candle
Answer:
crumpling of a piece of paper
Explanation:
chemical change cannot be reversed or gootten back
Answer:
Baking brownies!
Explanation:
The mixture of the ingredients undergoes a chemical change when it's heated and the substance changes very much so, melting a candle may seem like a similar change, but the wax is the exact same when it cools back down
I need help with this
What is an advatage of buying food grown locally.
Answer:
It is most of the time cheaper and more fresh than regular store bought food.
Explanation:
Name chemical changes in the chemical given below
boiling of water
curdling of milk
photosynthesis
melting of wax
Explanation:
boiling of water - Physical changes
curdling of milk - Chemical changes
photosynthesis - Chemical changes
melting of wax - Physical changes
A physical change is a change that alters the physical properties of matter particularly the form and state. In many of such cases, the change is easily reversible.
Examples are boiling of water and melting of wax
A chemical change is a change in which a new kind of matter is formed. It is always accompanied by energy changes. The process is not easily reversible.
Examples are curdling of milk and photosynthesis.
PLEASE HELP
State whether Irons atoms have a high or low electron affinity and how can you tell ?
Please help me:( I’ll give u points of its right
Answer:
k
p
p
k
k
I believe.. ............
Covalent bonds are most likely to form between atoms of which types of elements?
O A. metals and metalloids
OB. metals and metals
OC. metals and non-metals
D. non-metals and non-metals
Answer:
Nonmetals and Nonmetals
Explanation:
Covalent bonding is when atoms share valence electrons. Nonmetals typically have 4, so two atoms can bond to have the total of 8.
Covalent bonds are most likely to form between atoms of this type of chemical elements: D. non-metals and non-metals.
A covalent bond can be defined as a bond that exists in chemical compounds and it typically involves the sharing of electrons between the atoms of a non-metallic chemical element.
In Chemistry, there are two (2) main types of covalent bond and these include:
Polar covalent bondNon-polar covalent bondGenerally, a covalent bond is a type of bond that is commonly formed between two (2) non-metals while an ionic bond is usually formed between metals and non-metals.
Read more on covalent bond here: https://brainly.com/question/10429880
Which of the following is a property of an ionic compound?
A. Sharing of Electrons
B. Involves two or more anions.
C. Involves a metal and a nonmetal.
D. Has electrons moving from an anion to the cation.
Need this fast
Answer:
C. Involves a metal and a nonmetal.
Explanation:
Ionic compound involves a metal and a non-metal. Ionic compounds have electrovalent bonds between them.
These compounds are usually made up of metals and non - metals combining to form a unit.
The metals usually has low electronegativity and transfers it electrons to the non - metal. The non-metal has high affinity for the electron. The electrostatic attraction between the ions formed results in the ionic bond.i need help with this please help!
Answer: the answer is think it yourself
Explanation:
If the distance between two objects is cut in half, what happens to the
gravitational force between them?
A. It decreases to 1/4 its original magnitude.
B. It decreases to 1/2 its original magnitude.
C. It increases to 4 times its original magnitude.
D. It increases to 2 times its original magnitude.
Answer:
C. It increases to 4 times its original magnitude.
Explanation:
If the distance between two objects is cut in half, the gravitational force between them is increased by 4 times the original magnitude.
From Newton's law of universal gravitation, the gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional the the square of their masses.
Since the mass is constant, then the gravitational force of attraction will increase 4 times the original magnitude.lt the original distance = 4
Fg = [tex]\frac{x }{4^{2} }[/tex]
New distance = 3
Fg = [tex]\frac{x}{2^{2} }[/tex]
So;
[tex]\frac{x}{2^{2} }[/tex] / [tex]\frac{x }{4^{2} }[/tex] = 4
please help :) thank you
Answer:
4Fe + 3O₂ → 2Fe₂O₃
Explanation:
The chemical reaction is given as:
Fe + O₂ → Fe₂O₃
To balance an equation implies that the number of atoms and moles must be conserved.
using the coefficients a,b and c, let use a mathematical approach to balance the expression;
aFe + bO₂ → cFe₂O₃
Conserving Fe: a = 2c
O: 2b = 3c
let c = 1, a = 2 , b = [tex]\frac{3}{2}[/tex]
multiply through by 2 ;
a = 4, b = 3 and c = 2
4Fe + 3O₂ → 2Fe₂O₃
(10 points) You have a sample of 63.5g of C2H6. How many moles of C2H6 are in the sample? Show work
Answer:
30.06904
Explanation:
C3H4: Mass % C = 36.033 x 100 / 40.0641 = 89
An atom in the ground state has a stable valence
electron configuration. This atom could be an atom of
A) Al B) Cl C) Na D) Ne
At what temperature will 5 g of Cl2 exert a pressure of 900 mmHg at a volume of .75 L?
The temperature : 154.73 K
Further explanationGiven
mass = m = 5 g of Cl2
P = 900 mmHg = 1,18421 atm
V = 0.75 L
Required
Temperature
Solution
mol Cl2 = mass : MW = 5 : 71 = 0.07
Ideal gas law : PV = nRT
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.082 L.atm / mol K
T = temperature, Kelvin
T = PV/nR
Input the value :
T = 1.18421 x 0.75 / 0.07 x 0.082
T = 154.73 K
The watt is the standard unit of measurement for?
Answer:
electrical power. nnnnnnn
How the physical properties of iron are altered by
forming the carbon steel alloy?
A - The iron becomes relatively soft
52/98
B – The iron becomes less hard
C - The iron becomes harder and stronger
D - The iron becomes relatively malleable
Answer: C - The iron becomes harder and stronger
Explanation:
The pure iron when mixed with the carbon then steel is formed which is the interstitial alloy of iron. About 0.002%- 2.1% (m/m) of carbon. The carbon atoms being smaller than the iron atom occupy the interstitial spaces or interstices in between the iron atoms. Thus these carbon atoms introduce imperfections in the iron crystal layer. The iron crystal layers become harder and they slide past one another and the iron becomes harder.
What is the lowest possible energy level that an electron can occupy?
Answer: the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. At the lowest energy level, the one closest to the atomic center, there is a single 1s orbital that can hold 2 electrons
Explanation:
Use the information below to match each object with the metal it is made of.
Object A - a small block of metal with a mass of 853 g and a volume of 490 cm.
Object B - metal pellets with a mass of 48.76 g and a volume of 4.30 cm3
Object C-a 631-cm' medallion with a mass of 4965 g.
Object D - a coin with a volume of 3.15 cmº and a mass of 28.23 g.
Answer:
Explanation:
Love the pfp
how do enzymes help with digestion
Answer: Digestive enzymes play a key role in breaking down the food you eat. These proteins speed up chemical reactions that turn nutrients into substances that your digestive tract can absorb. Your saliva has digestive enzymes in it
Explanation: