Iron oxide reacts with aluminum to give aluminum oxide and iron, what kind of chemical is this?
A) Combustion
B) decomposition
C) replacement
D) synthesis
Answers
Answer:
[tex]{ \tt{c). \: replacement}}[/tex]
C) replacement
Iron(III) oxide (Fe2O3) reacts with aluminium(Al) to form aluminium oxide(Al2O3) and molten iron(Fe). This is a replacement reaction
Related Questions
Calculate the percentage of water of crystallisation in MgSO⁴ 7H²O
Answers
Answer:
Formula of EPSOM salt = MgSO4.7H2O
molecular mass of MgSO4.7H2O = atomic mass of Mg + atomic mass of S + 4 × atomic mass of O + 7 { 2 × atomic mass of H + atomic mass of O }
= 24 + 32 + 4× 16 + 7{ 2 × 1 + 16 } g/mol
= (24 + 32 + 64+ 126 ) g/mol
= 246 g/mol
molecular mass of total water = 7 × ( 2× atomic mass of H + atomic mass of O )
= 7 × 18 = 126 g/mol
now ,
% mass of H2O in EPSOM salt = {total molar mass of H2O/molar mass of Epsom salts }× 100
= {126/246 } × 100
= 12600/246
= 51.21 %
Explanation:
i have done it hope it helps
Write the electronic configuration of calcium and potassium.
Answers
Answer:
Calcium= 2,8,8,2
Potassium= 2,8,8,1
Answer:
Electronic configuration of Potassium (K)Atomic number of potassium = 19
Therefore number of electrons = 19
Since, maximum number of electrons in outermost orbit will not be more than 8, thus the 19th electron of potassium atom will reside in 4th.
Thus, electronic configuration of potassium is
given in first pic.
Number of orbit in potassium = 4
Electronic configuration of Calcium (Ca)Atomic number of calcium = 20
Therefore number of electrons = 20
Thus, electronic configuration of calcium is given in sec pic.
Number of orbit in calcium = 4
Explanation:
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What is the difference between a chemical and physical change?
Answers
PLEASEEEE HELPPPPP!!
Answers
Answer:
Its the first one
Explanation:
4 mol is the highest of the Bunch and 4.0L is the lowest making the first answer the correct one
The diagram below represents a beaker of water being heated by a flame. The arrows represent heat
transfer occurring in the beaker.
Which process is represented by the arrows in the diagram?
O condensation
O conduction
O convection
O radiation
Answers
Answer:
condensation
Explanation:
when heated beaker sed condensation
Which method is best suited for separating a 500 mL sample of two miscible liquids whose boiling points differ by approximately 60°C?
A) use of a separators funnel
B) paper chromatography
C) evaporation
D) distillation
E) fractional distillation
Answers
If no loss or gain of electrons occur by mixing of two atoms, we say that they may be attached to each
other due to
A proton attraction
B neutron attraction
C sharing of electrons
D opposite charges
<
Answers
Answer:
The correct option is option C
Explanation:
Loss or gain of electron(s) occurs in a type of attraction known as electrovalent or ionic attraction. In this type, there is transfer (or loss) of electron(s) from a metal atom to become positively charged while a nonmetal accepts (or gains) this electron to become negatively charged.
When this does not happen, two metal atoms can become attached by sharing the same electrons through a form of attraction known as covalent bonding. Here, the two atoms share electrons (known as shared pair) together to achieve there octet configuration on the outermost shell.
I need help with number 19 A through D
Answers
Magnesium lon has less electrons than its atom
True
False
Answers
hope that helps
What would happen to the entropy in the reaction 203(9) ► 302(9)?
A. It is impossible to tell.
B. It stays the same.
C. It decreases.
D. It increases.
Answers
bez number of particles in reaction increases so randomness or entropy increase.
as entropy is the degree of randomness of particles in a system
What are the coefficients for the following equation when it is balanced?
CaF2 (aq)
KOH(aq) →
Ca(OH)2 (s)
KF (aq)
Answers
A 217.6 sample of gas is collected at 9.011 atm and 127.8°C. What volume does the gas have at 44.9 atm and 11.9 °C?M
Answers
Answer:
The correct answer is = 31.04
Explanation:
The relation between volume, temperature and pressure of a fix amount of a gas can be expressed by the combined gas law:
PV/T = k
It can be written as well as
P1V1/T1 = P2V2/T2
Given:
V1 = 217.6
P1 = 9.011 atm
T1 = 127.8°C = 400.95 K
P2 = 44.9
T2 = 11.9 °C = 285.05
Solution:
Putting value in the formula
V2 = P1V1T2/P2T1
= (217.6*285.05*9.011)/44.9*400.95
V2 = 31.04
Maria examines a mixture that appears to be the same throughout. However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid.
Which conclusion best fits her observations?
Answers
Answer:
However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid. Which conclusion best fits her observations? The mixture is a solution because it has the same appearance throughout the sample
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The atom of element has 25 electrons and 30 neutrons write down its atomic number and mass number.
Answers
Answer:
Atomic number = 25 protons
Mass number = ( 25 + 30 ) = 55
mass-55 hope this helps
PLS HELP Discuss the phenomena of sunrise and sunset seen on Earth and describe how they will be different from the perspective of outer space. YOU WILL GET POINTS IF U DO THIS PLSSSSSS
Answers
Answer:
because you are cxloser
Explanation:
Are you sure it’s d
Plz tell me
Answers
Answer:
? which question
Explanation:
what type of solids conduct electricity in water: ionic, covalent, metallic?
Answers
Answer:
Ionic compounds are crystalline solids, soluble in water and conduct electricity when molten or in solution. These characteristics are due to the type of link that holds them together.
What is the frequency of an electromagnetic wave that has a wavelength of
8.5 x 102 m in a vacuum? (The speed of light in a vacuum is 3.00 x 108 m/s.)
A. 1.2 x 10-3 Hz
B. 2.8 x 10-6 Hz
C. 3.5 105 Hz
D. 2.6 x 1011 Hz
Answers
➡ ANSWER
☑ C. 3.5 105 Hz
9. How many significant figures are in the measurement 1,300 g?
2
unlimited
3
4
Answers
Answer:
4
4, because when there is no number after decimal then all the numbers are considered significant even 0 is the last number.
Select the atoms that are likely to gain electrons to form anions:
A. Cesium (Cs)
B. Chlorine (CI)
c. Nitrogen (N)
D. Sulfur (S)
hurryyy asap make u the brainlyeist
Answers
Answer:
c
Explanation:
Explain what will happen to the crystal when cations are pushed they face each other and the movement is simulating an applied force
Answers
Answer:
When an ionic crystal breaks, it tends to do so along smooth planes because ... ions are forced near each other and the repulsive force causes the crystal to shatter. ... Cations move to one electrode, while anions move to the other, ... Diagram of ions in an ionic solution when an electrical current is applied.
Explanation:
Hope this helped
How many particles are in 13.5 grams of Beryllium ?
Answers
There would be 9.03 x [tex]10^{23}[/tex] particles in 13.5 grams of Beryllium.
Recall that 1 mole of a substance contains 6.02 x 10^23 atoms.
Number of moles in 13.5 grams of Beryllium = mass/molar mass
= 13.5/9
= 1.5 moles
Thus, total number of atoms in 1.5 moles Beryllium:
= 1.5 x 6.02 x 10^23
= 9.03 x [tex]10^{23}[/tex]
More on the number of particles in a substance can be found here: https://brainly.com/question/1445383
(6) I need help very fast plsss
Answers
How does the process of cell division replace damaged cells
Cells split into two new cells with the identical genetic make up
Chloroplasts use carbon dioxide and water to create glucose
Metatron Gia uses oxygen to break down glucose and convert it to ATP
Waste passes through the cell membrane and leaves the cell
Answers
Answer:
A
Explanation:
The cells split up into two to repair the damaged cell
Which of the following can cause a population to decrease in size?
A Lack of rain
B. More births than deaths C. Plentiful food supplies
D. Organisms moving into an area, but not out.
Answers
Answer:
D
Explanation:
because when some organisms will move from one place to another the number of population will decrease
If it’s more than one choice then the answers are A and D because lack of rain can cause droughts which many people don’t want to live through.
18- The number of orbitals in each sublevel are:
A:-s:2, p:3, d:10, and f:14
B:-s:2, p:6, d:10, and f:14
C:-s:1, p:3, d:5, and f:7
D:-s:1, p:2, d:3, and f: 4
Answers
s2,p6,d10,f14
S contains 2 orbitals
P contains 6 orbitals
D contains 10 orbitals
F contains 14 orbitals
PLEASE HELP!
this is due tomorrow and i really need help!!! this is for my final grade! thank you
Answers
Answer:
what the--
Explanation:
pls tell one by one
PCl5 <-> PCl3 + Cl2
PCl5 decomposes into PCl3 and Cl2 according to the equation above. A pure sample of Pcl5 is placed in a rigid, evacuated 1.00 L container. The initial pressure of the PCl5 is 1.00 atm. The temperature is held constant until the PCl5 reaches equilibrium with its decomposition products. The figures below shows the initial and equilibrium conditions of the system.
As the reaction progresses toward equilibrium, the rate of the forward reaction
A) increases until it becomes the same as the reverse reaction rate at equilibrium
B) stays constant before and after equilibrium is reached
C) decreases to become a constant nonzero rate at equilibrium
D) decreases to become zero at equilibrium
Answers
Answer:
PCl5 <-> PCl3 + Cl2
PCl5 decomposes into PCl3 and Cl2 according to the equation above. A pure sample of Pcl5 is placed in a rigid, evacuated 1.00 L container. The initial pressure of the PCl5 is 1.00 atm. The temperature is held constant until the PCl5 reaches equilibrium with its decomposition products. The figures below show the initial and equilibrium conditions of the system.
As the reaction progresses toward equilibrium, the rate of the forward reaction
A) increases until it becomes the same as the reverse reaction rate at equilibrium
B) stays constant before and after equilibrium is reached
C) decreases to become a constant nonzero rate at equilibrium
D) decreases to become zero at equilibrium
Explanation:
At equilibrium, both forward and backward reactions take place with constant speed.
The reaction will never cease.
Due to this reason chemical equilibrium is called dynamic in nature.
At equilibrium:
the rate of forward reaction = rate of backward reaction
As the reaction progresses toward equilibrium, the rate of the forward reaction decreases to become a constant nonzero rate at equilibrium.
Answer is option C).
When a system is in a state of chemical equilibrium, neither the reactant concentration nor the product concentration changes over time, nor does the system exhibit any further changes in its attributes. Here the correct option is C.
The system reaches a condition of chemical equilibrium when the rate of the forward reaction equals the rate of the reverse reaction. The system is considered to be in a state of dynamic equilibrium when the concentrations of the reactants and products do not change further as a result of the equal rates of the forward and reverse processes.
Equilibrium is impacted by a number of variables, including temperature, pressure, and the system's concentration. Here at equilibrium the rate of the forward reaction decreases to become a constant nonzero rate at equilibrium.
Thus the correct option is C.
To know more about chemical equilibrium, visit;
https://brainly.com/question/4289021
#SPJ6
Plz help..
How to name alcohols...
Answers
Answer:
Alcohols are usually named by the first procedure and are designated by an -ol suffix, as in ethanol, CH3CH2OH (note that a locator number is unnecessary on a two-carbon chain). On longer chains the location of the hydroxyl group determines chain numbering. For example: (CH3)2C=CHCH(OH)CH3 is 4-methyl-3-penten-2-ol.10
Explanation:
Answer:
ethanol formula :C2H5Oh
Silicon is in the same group of the Periodic Table as carbon. The compound
formed between silicon and hydrogen is likely to have the formula
SiHz
SiH
SizH:
SizHs
Please hurry
Answers
Answer:
SiH
Explanation:
The symbol for Silicon is Si, and the symbol for Hydrogen is H. There is no need for extra characters in the name.