Answer:
c. 3
Explanation:
The unbalanced reaction expression is given as:
Fe + O₂ → Fe₂O₃
To balance the expression gives the coefficient of oxygen.
Assign the coefficients a,b, c and use a mathematical approach to solve this problem:
aFe + bO₂ → cFe₂O₃
Conserving Fe: a = 2c
O: 2b = 3c
Now 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
The coefficient of O₂ is 3
Identify three nonmetal atoms that, when bonded covalently, have an argon electron configuration.
Answer:
Phosphorus
Sulphur
And chlorine are non metals when bonded covalently gain electronic configuration of argon
Like PCl3
SO2 and HCl
Explanation:
When sugar is mixed with water, equilibrium is reached when: _______
a. the dissolved sugar molecules are evenly distributed throughout the solution.
b. molecules of sugar stop moving.
c. two tablespoons of coffee are added.
d. water and sugar molecules are moving at the same speed.
e. there is the same number of water molecules as dissolved sugar molecules.
According to the solubility concept, when sugar is mixed along with water, chemical equilibrium is reached as the dissolved sugar molecules are evenly distributed throughout the solution.Thus, the correct option is A.
Solubility is defined as the capability of a substance which is basically a solute forming a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute which is present in a saturated solution.
The solubility depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.
Thus, when sugar is mixed with water, equilibrium is reached when the dissolved sugar molecules are evenly distributed throughout the solution.Thus, the correct option is A.
Learn more about solubility,here:
https://brainly.com/question/28170449
#SPJ4
Calculate the mass of 3.5 moles of H2O
63 g H₂O
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
3.5 mol H₂O
Step 2: Identify Conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 3.5 \ mol \ H_2O(\frac{18.02 \ g \ H_2O}{1 \ mol \ H_2O})[/tex]Divide/Multiply: [tex]\displaystyle 63.07 \ g \ H_2O[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
63.07 g H₂O ≈ 63 g H₂O
5
is the sum of the kinetic energy and the
of the particles that make up an object. *
(7 Points)
Thermal energy, potential energy
mechanical energy, potential energy
ООО
chemical energy, mechanical energy
Thermal energy, mechanical energy
Answer:
The total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy. This sum is simply referred to as the total mechanical energy
In which way does electricity flow in a DC circuit? *
From the negative terminal of the battery to the positive one
From the positive terminal of the battery to the negative one
The electricity flows first from the negative terminal to the positive one, then the
polarity switches
The electricity flows first from the positive terminal to the negative one, then the
polarity switches
Answer:
From the negative terminal of the battery to the positive one
Explanation:
DC is just dirrect current that has e- flowing from the negative terminal to the positive.
1. About how many Atlantic horseshoe crabs were caught in 2017?
Answer:
994,491 were caught in 2017
Part 1
For 671 g of butadiene (C4H6) calculate the number of moles.
Answer in units of mol.
Part 2
Calculate the number of molecules.
Answer in units of molec.
Answer:
74.73 ×10²³ molecules
Number of moles = 12.41 mol
Explanation:
Given data:
Mass of C₄H₆ = 671 g
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles:
Number of moles = mass/molar mass
Number of moles = 671 g/ 54.091 g/mol
Number of moles = 12.41 mol
Number of molecules:
1 mole contain 6.022×10²³ molecules
12.41 mol × 6.022×10²³ molecules / 1 mol
74.73 ×10²³ molecules
When fat comes in contact with sodium hydroxide, it produces soap and glycerin. Determine whether this is a physical change or a chemical change. Explain your
Answer:
It is a chemical change
Explanation:
Fat is a triglyceride. Triglycerides form soap when they come into contact with sodium hydroxide.
Now, we know that a chemical change is one in which a new substance is formed and it is not easily reversible. Heat is also given out or absorbed in the process.
Now the combination of sodium hydroxide and fat yields a new substance called soap. The appearance of the new substance conclusively proves that a chemical change has taken place.
Plz guys help me plz
Explanation:
Can you edit your question and get a better pic because I cant see anything. Its blurry.
On the basis of strength of intermolecular forces, which of the following elements would be expected to have the highest melting point?
Answer:
I think its Kr
Explanation:
sorry if I'm wrong
Bromine (Br₂) has the highest melting point among the given elements. Therefore, option (A) is correct.
What are intermolecular forces?Intermolecular forces can be described as the attractive and repulsive forces that develop between the molecules of a substance. These forces are responsible for most of the chemical and physical properties of matter. The intermolecular forces between the molecules are Vander Waals forces.
Forces that exist between the molecules themselves are known as intermolecular forces. The particles of solids and liquids are held together by intermolecular forces.
The intermolecular forces are Dipole-Dipole Interactions, Ion-Dipole Interactions, Ion-Induced Dipole Interactions, Dipole-Induced Dipole Interaction, and Dispersion Forces.
As the size of the atoms increases the strength of the intermolecular force also increases and a large amount of energy will be required to break bonds. Since Bromine has the largest size among the all other elements. Therefore, Bromine will have the highest melting point.
Learn more about intermolecular forces, here:
https://brainly.com/question/9007693
#SPJ6
Your question was incomplete, but the complete question was,
On the basis of the strength of intermolecular forces, which of the following elements would be expected to have the highest melting point?
A) Br₂
B) Cl₂
C) F₂
D) N₂
calculate the relative atomic mass
Answer:
add the isotopes atomic masses and divide by their number
Explanation:
Why does a rock sink in water? *
Answer:
Rocks sink in water their density is greater than the density of the water.
Explanation:
The density is 997 kg/m³ or about 1 g/cm³. Anything with a density greater than that will sink in water.
Due to the fact that a rock has a higher density than water, it sinks in liquid. Objects with a higher density than the surrounding fluid will sink because density is the mass of an object per unit volume.
Due to the fact that rocks often have a higher density than water, the gravitational pull of the rock is larger than the buoyant pull of the water. The rock defeats the buoyant force as a result, sinking to the bottom. According to Archimedes' principle, the principle of buoyancy asserts that an object submerged in a fluid feels an upward buoyant force equal to the weight of the fluid it displaces.
To know more about gravitational pull, here
brainly.com/question/6839945
#SPJ2
Why is the mass of an actual element/ atom different then the number show on the periodic table?
A. The periodic table contains the mass of the most abundant isotope only
B. The periodic table contains an average mass of isotopes by abundance
C. The periodic table contains the largest mass of all isotopes
D. It is the same, the mass shown is the mass of an element/ atom
Answer:
B.
Explanation:
The atomic masses listed on the periodic table are a weighted AVERAGE of an element's isotopes.
Calculate the density of a substance for which 4.78 x 106 L of the substance has a mass of 1.50 x 107 kg. Express your answer using the correct number of significant figures, and do not enter your answer using scientific notation.
The density of a substance for which 4.78 x 106 L of the substance has a mass of 1.50 x 107 kg is 3.138 x 10¹².
What is density?Density is the mass per unit volume. Density is s a scalar quantity. It is calculated by dividing the mass by volume. It is denoted rho, a Greek letter. It is denoted by a small d.
rho = m / v
rho = density
m = mass
V = volume
The mass is calculated in grams and kilograms. The volume mass and density are interrelated if two entities are given, the third can be calculated.
Given, that the volume of a substance is 4.78 x 10⁶ L
The mass of the substance is 1.50 x 10⁷ kg
So, put the values in the formula
d = m / v
d = 1.50 x 10⁷ / 4.78 x 10⁶
d = 3.138 x 10¹²
Thus, the density of a substance is 3.138 x 10¹².
To learn more about density, refer to the link:
https://brainly.com/question/27996934
#SPJ2
fine the average acceleration of the cyclist moving from point A to point B , and over the whole trip ( from point A to point D ) .
Explanation:
Andresiaは13.1マイルの長さのレースを走っています。彼はすでに1.1マイル走っています。アンドレスが走るために残っているマイル数を再確認する
Describe the environmental impacts that are involved during the design, research and development, and marketing phases of cell phones.
Answer:
joe mama
Explanation:
400 + 20 + 420
Type the correct answer in the box. A car accelerates from 4 meters/second to 16 meters/second in 4 seconds. The car's acceleration is _
Answer:
Formula for acceleration is
V-U÷T
In the given information
V=16
U=4
T=4
Acceleration =16-4/4
=3 metre per second ^2
Explanation:
PLEASE HELP ASAP I NEED IT HELP PEASEEEEEEEEEEE it’s number 4 (this is science)
cholorine is more reactive than nitrogen? why
Answer:
Because of the presence of lone pairs in nitrogen it further adds to its reactivity. Hence nitrogen is more electronegative than chlorine. ... Chlorine is less reactive than nitrogen in other words nitrogen is more reactive than chlorine
Explanation:
Brainliest plzzzzzzzzzzzzzzzzzzz
The oxidation of Cu₂O(s) to CuO(s) is an exothermic process:
2 Cu₂O(s) + O₂(g) → 4 CuO (s) ∆H = -292.0 kJ･mol⁻¹
Calculate the work done when 6.50 mol of Cu₂O(s) undergo oxidation at STP.
Answer:
w = 7376.6 J
Explanation:
To calculate the work done in the system, we need first to calculate the number of moles of all compounds.
The following expression, that comes from the 1° law of thermodynamic, will help you to get the work:
w = ΔnRT
Where:
Δn: difference in the number of moles between products and reactants
R: constant universal of gases (8.314 J / mol K)
T: Temperature in Kelvin.
As we are doing this reaction in STP, then the Pressure is 1 atm, and temperature is 0 °C or 273 K.
Now, we already have the moles of Cu₂O, let's see, according to the balanced reaction, how many moles we should have of O₂ and CuO.
If 1 mole of O₂ reacts with 2 moles of Cu₂O then 6.5 moles of Cu₂O will be:
moles O₂ = 6.5 moles Cu₂O * (1 mole O₂/2 moles Cu₂O) = 3.25 moles O₂
If 2 moles of Cu₂O produces 4 moles of CuO, then 6.5 moles will be:
moles CuO = 6.5 moles Cu₂O*(4 moles CuO/2 moles Cu₂O) = 13 moles CuO
Now that we have the moles, let's calculate the value of Δn.
Δn = moles product - moles reactants
Δn = 13 - (6.5 + 3.25) = 3.25 moles
Now, we can calculate the work done in the system:
w = 3.25 * (8.314 * 273)
w = 7376.6 J or 7.3766 kJHope this helps
Please please !!! help me I’ve been doing this for 2 hours
How many molecules of NaCl are in 0.61 moles of NaCl?
1.8 x 1023
2.5 x 1023
3.7 x 1023
4.5 x 1023
Answer:
3.7 x 10^23
is the right answer
Which of the following is absolutely necessary for cloud formation?
A) Condensation nucleii
B) Hydrogen gas
C) Liquid methane
D) Blue food coloring
Answer:
The correct answer is letter A. Condensation nucleii
A gene carries the ________ for a trait. brainpop
Pls help, science 8th grade question, #11 thx :)
predict what would happen if two people with equal mass standing on skateboard pushed against each other
Answer: They would both be pushed backward. (READ EXPLANATION)
Explanation:
Since your question has an error in it, I will provide two answers. If they were standing on their feet, they would not move. if they're both standing on skateboards, they would both move backwards because they have no friction on the ground. if both of them are standing on the same skateboard and pushing against each other, they would not move.
Which best summarize the scientist process that led to our current understanding of DNA
Answer:
Each scientist made an important, but unrelated, contribution. Scientists built on the previous work of other scientists to make new discoveries. Most of the discoveries were made by chance and did not depend on prior knowledge.
Explanation:
i hope i helped * :3
Complete the complex dimensional analysis problem to determine the price of one atom of aluminum. A 20cm x 20cm square of aluminum had a mass of 1.50g. A box of aluminum cost $1.29 and the area of foil in the box is 2.33 m^2. What is the cost of one atom of aluminum?
$8.09
Because you multiply and subtract to get the answer
n a system for separating gases, a tank containing a mixture of hydrogen and carbon dioxide is connected to a much larger tank where the pressure is kept very low. The two tanks are separated by a porous membrane through which the molecules must effuse. If the initial partial pressures of each gas is 5.00 atm, what will be the mole fraction of hydrogen in the tank after the partial pressure of carbon dioxide has declined to 4.50 atm?
a. 52.1%
b. 27.4%
c. 4.68%
d. 37.2%
e. 32.1%
Answer:
52.63%
Explanation:
We can obtain the mole fraction from the formula;
partial pressure = mole fraction * total pressure
mole fraction = partial pressure/total pressure
Partial pressure of Hydrogen = 5.00
Partial pressure of Carbon-dioxide= 4.50
Total gas pressure = 9.50
Mole fraction of Hydrogen = Partial pressure of Hydrogen/ Total gas pressure
= 5.00/9.50
= 0.5263
= 52.63%
What does an electric field
surround?
Answer:
An electric field is the physical field that surrounds each electric charge and exerts force on all other charges in the field, either attracting or repelling them.
______________
meow
When calcium and phosphorus form an ionic bond, what is the chemical formula of the compound?
