Answer:
Oxidation numbers assign ownership of the electrons to one atom or another in a compound. ... Scientists use these numbers to help name compounds, write formulas and balance chemical equations. They are also useful when studying reactions and they can help you identify when something is oxidized or reduced.
Reactants are on the left side of the equatio. Arrow true or false
An ore sample is found to contain 10.500000 g of cobalt and 87.3 g waste rock (gangue). What is the
percent by mass of cobalt in the ore?
Answer:
[tex]\% Co=10.7\%[/tex]
Explanation:
Hello!
In this case, since this is a mixture composed by cobalt and waste rock, we can compute the percent by mass of cobalt as shown below:
[tex]\% Co=\frac{m_{Co}}{m_{Co}+m_{waste}} *100\%\\\\[/tex]
Thus, we plug in to obtain:
[tex]\% Co=\frac{10.500000g}{10.500000g+87.3} *100\%\\\\\% Co=10.7\%[/tex]
Best regards!
Which of the following is an example that a chemical reaction has occurred?
A. Cut piece of lumber into two pieces
B. Bubbling/fizzing
C. Phase change (ex. solid changes to liquid)
D. Iron being melted
Suppose a student repeats a measurement two times and then calculates the standard deviation. Because the standard deviation is small, the student reports that their experiment was extremely precise. Is the student's conclusion appropriate?
A) No, because there were not enough measurements to use standard deviation.
B) Yes, because a small standard deviation indicates greater precision
C) Yes, because a small data set always has excellent precision
D) No, because a large standard deviation indicates greater precision
Answer:b
Explanation:
How much water has to be evacuated from 250ml of 1M Ca(OH)2 to make it 3M
Answer:
ERROR
Explanation:
Answer could not be show due to technical difficulties
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. The volume of 3M diluted solution of calcium hydroxide is 83.3ml.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
According to the neutralization law,
M₁V₁=M₂V₂
where,
M₁ = molarity of stock solution = 1 M
V₁ = volume of stock solution = 250ml
M₂ = molarity of dilute solution =3M
V₂ = volume of dilute solution = ?
substituting all the given values we get
M₁V₁=M₂V₂
1 M×250ml=3M×V₂
V₂=83.3ml
Therefore, volume of 3M diluted solution of calcium hydroxide is 83.3ml.
Learn more about Molarity, here:
https://brainly.com/question/16727614
#SPJ2
HELP IM AB TO CRY
What is the force of gravity (in Newtons) acting between the Earth and a 125-kg person standing on the surface of the Earth?
Answer:
1.23 × 10³ N
Explanation:
Step 1: Given and required data
Mass of the person (m): 125 kgAcceleration due to the gravitational force (g): 9.81 m/s²Step 2: Calculate the force acting between the Earth and a 125-kg person standing on the surface of the Earth
We will use Newton's second law of motion.
F = m × g
F = 125 kg × 9.81 m/s²
F = 1.23 × 10³ N
What is the mass of 1.58 moles of CH4
25.4 g CH₄
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
1.58 mol CH₄
Step 2: Identify Conversions
[PT] Molar Mass of C - 12.01 g/mol
[PT] Molar Mass of H - 1.01 g/mol
Molar Mass of CH₄ - 12.01 + 4(1.01) = 16.05 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 1.58 \ mol \ CH_4(\frac{16.05 \ g \ CH_4}{1 \ mol \ CH_4})[/tex]Multiply/Divide: [tex]\displaystyle 25.359 \ g \ CH_4[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
25.359 g CH₄ ≈ 25.4 g CH₄
How does a limiting reagent affect how much product is formed?
O A. The amount of product will be limited by the molar mass of the
limiting reagent
B. The amount of product will be limited by the sum of the reactant
coefficients.
C. The amount of product will be limited by the number of moles of
the limiting reagent.
D. The amount of product will be limited by leftover amounts of other
reactants.
Answer:
C. The amount of product will be limited by the number of moles of
the limiting reagent.
Explanation:
a p e x :)) i just took the quiz
The amount of product will be limited by the number of moles of
the limiting reagent. Hence, option C is correct.
What is a Limiting reagent?The reactant that gets consumed early in the reaction restricts the quantity of product which will be produced in the chemical reaction. Thus, the reactant that gets consumed early in a chemical reaction is a limiting reagent.
Hence, the amount of product will be limited by the number of moles of the limiting reagent.
Learn more about limiting reagents:
brainly.com/question/14225536
#SPJ5
Does anyone know the answers for these
Answer: 1. 0.045moles
2. 2.10 grams
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
1. [tex]\text{Number of moles of zinc nitrate}=\frac{8.51g}{189.36g/mol}=0.045moles[/tex]
2. Mass of [tex]C_2H_4=moles\times {\text {Molar mass}}=0.075moles\times 28.05g/mol=2.10g[/tex]
please fill this formula
Find the moles in 0.0023 of Co, at STP:
A force that is opposite to motion of a falling object?
Answer:
Sliding friction: A friction force that opposes the motion of an objects as it slides over a surface.
Ionic compounds form because ___ charges attract
Answer:
Ionic bonding is the attraction between positively- and negatively-charged ions. These oppositely charged ions attract each other to form ionic networks (or lattices). Electrostatics explains why this happens: opposite charges attract and like charges repel.
Explanation:
Ionic compounds form because opposite charges attract.
In an ionic compound, positive and negative ions come together to form a stable structure. This occurs when an atom loses electrons to become a positively charged ion (cation) and another atom gains those electrons to become a negatively charged ion (anion). The positive and negative charges of the ions attract each other, resulting in the formation of an ionic bond.
This attraction between positive and negative charges is what holds ionic compounds together. The strong electrostatic forces of attraction between ions result in a lattice structure, where each ion is surrounded by oppositely charged ions.
Thus, ionic compounds are formed because opposite charges attract.
Learn more about ionic bond,here:
https://brainly.com/question/9075398
#SPJ6
What is berylium phosphide anion?
Answer:
Molecular Formula, Be3P2. Synonyms. Beryllium phosphide. Beryllium phosphide (BeP2). EINECS 261-137-1. 57620-29-8. 58127-61-0. Molecular Weight.
Molecular Formula: Be3P2
Molecular Weight: 88.98407 g/mol
Structure: Find Similar Structures
PubChem CID: 6453515
Explanation:
What happens as elevation increases?
Answer:
As altitude increases, the amount of gas molecules in the air decreases the air becomes less dense than air nearer to sea level.
Explanation:
NEED HELP ASPA WILL MAKE THE BRAINIEST ANSWER
A student captures 0.50
moles of hydrogen (H2), oxygen (O2), chlorine (Cl2), carbon dioscide (CO2), and carbon monoxide (CO) gas in separate, evacuated flasks.
Arrange the flasks of gases in order of increasing grams of gas.
.H
H
H2
H2
Answer: [tex]H_2[/tex] < [tex]CO[/tex] < [tex]O_2[/tex] < [tex]CO_2[/tex] < [tex]CL_2[/tex]
Explanation:
According to avogadro's law, 1 mole of every substanceweighs equal to its molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
1. Mass of [tex]H_2=moles\times {\text {Molar mass}}=0.50moles\times 2g/mol=1g[/tex]
2. Mass of [tex]O_2=moles\times {\text {Molar mass}}=0.50moles\times 32g/mol=16g[/tex]
3. Mass of [tex]Cl_2=moles\times {\text {Molar mass}}=0.50moles\times 71g/mol=35.5g[/tex]
4. Mass of [tex]CO_2=moles\times {\text {Molar mass}}=0.50moles\times 44g/mol=22g[/tex]
5. Mass of [tex]CO=moles\times {\text {Molar mass}}=0.50moles\times 28g/mol=14g[/tex]
Thus the flasks of gases in order of increasing grams of gas is:
[tex]H_2[/tex] < [tex]CO[/tex] < [tex]O_2[/tex] < [tex]CO_2[/tex] < [tex]CL_2[/tex]
If the initial temperature of a movable cylinder was 130 degrees Celsius
with a pressure of 1 ATM and an initial volume of 2 Liters, what would
the new volume be if the temperature was lowered to 324 degrees Kelvin
and the pressure was raised to 1.1 ATM?
Answer: The new volume will be 1.5 L
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 1 atm
[tex]P_2[/tex] = final pressure of gas = 1.1 atm
[tex]V_1[/tex] = initial volume of gas = 2 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]130^0C=(130+273)K=403K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]324K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{1\times 2}{403}=\frac{1.1\times V_2}{324}[/tex]
[tex]V_2=1.5L[/tex]
The new volume will be 1.5 L
106Pd2+
How many protons, electrons, and neutrons are in this?
Answer:
Protons = atomic #
Neutrons = Mass # - atomic #
Electrons = atomic # - charge ( If no charge electrons = 0 therefore electrons = atomic # only if No charge not including the ^ number thing)
The element is Palladium
atomic number = 46.
Atomic Mass = 106
Therefore The answer being
Protons = 106
Neutrons = 60
Electrons = 104
( Sorry im only in the 9th grade but i did the best i could) The reason electrons are 104 is because of the 2+ meaning 2+ more protons than electons.
Which is the weakest acid?
1. Butane
2. But-1-yne
3. Water
4. But-1-ene
when energy transforms, which of the following does it produce?
A. heat
B. light
C. sound
D. motion
motion
Explanation:
it works in our daily life
An atom of carbon contains 6 total electrons. How many of these electrons are in s orbitals?
1
2
4
6
Answer:
4
Explanation:
total electrons = 6
electronic configuration = 1s^2, 2s^2, 2p^6
so in s orbital there are 4 electrons.
Hope it helps you (｡◕‿◕｡)
How many atoms of which elements are represented by the following formula?
H3PO4
What is the definition of energy (in scientific terms)?
A. The motion of an object
B. The ability to do work
C. A force used on an object
D. A change in temperature
formula for trichlorine tetroxide
Answer:
*Chlorine trioxide is ClO3
Explanation:
An experiment shows that a 250 −mL gas sample has a mass of 0.436 g at a pressure of 742 mmHg and a temperature of 27 ∘C.
What is the molar mass of the gas?
Answer:
41.9 g/ mol hope that helps you out
Explanation:
d=p.m/ r.t
rain gauge non examples
Answer:
Explanation:
?? sorry but i do not get what u said
How many chromosomes should be in each cell labeled with an X? A. 32 B. 16 C. 8 D. 4
Answer:
B.16 B.16 B.16
Explanation:
B.16 B.16 B.16 B.16 B.16I have to write the balanced equation
Solder is a silver metal used to hold pipes together. When the solder is heated, it melts and acts as a type of metal "glue." Mrs. Hanley heats a piece of solder until it melts between two pipes. What best identifies the point at which a physical change first takes place?
A)when the solder melts
B)when the solder cools down
C)when the solder is a soft metal
D)when the solder becomes solid again
Answer:
A
Explanation:
Write the formula of the conjugate base of the Brønsted-Lowry acic, HF
Answer:
Furthermore, because hydrofluoric acid, HF, loses a proton, H+1, to generate its conjugate in the reaction that is shown above, this reactant can be classified as a Brønsted-Lowry acid, and, consequently, the fluoride ion, F–1, is the conjugate base of this acid.
Explanation:
hope this helps
The formula of the conjugate base of the Bronsted-Lowry acid, HF is represented as F⁻.
What is the Bronsted-Lowry concept?The Bronsted-Lowry theory can be described as an acid-base reaction where acid and base react with each other and by an exchange of proton acid, produces its conjugate base and the base creates its conjugate acid.
The Bronsted-Lowry concept is actually an extended version of Arrhenius's theory of acid base. According to the Bronsted-Lowry concept, acid is a substance that donates a hydrogen ion or a proton and forms its conjugate base and the base is a substance that accepts proton and produces its conjugate acid.
Bronsted-Lowry acid can be represented as:
Acid ⇄ Conjugate base + H⁺
The conjugate base of Bronsted-Lowry acid HF can be represented as follows:
HF ⇄ F⁻ + H⁺
Therefore, fluoride ion F⁻ is the conjugate base of the Bronsted-Lowry acid HF.
Learn more about the Bronsted-Lowry concept, here:
https://brainly.com/question/14407412
#SPJ6