Answer: Mendelevium
Explanation:
Each electron can be represented by 4 quantum numbers. The two electrons in the outermost level of strontium are designated at 5 s . How many quantum numbers would these two electrons have in common
Explanation:
They are both in shell 5 and subshell s.
Since s only has 1 orbital, they also have the same orbital number.
But they have different magnetic spins.
Hence 3 out of 4 quantum numbers are in common.
How many grams of calcium are made up by 2.68 x 1023 atoms?
Answer:
Mass = 17.8 g
Explanation:
Given data:
Number of atoms of Ca = 2.68 × 10²³
Mass in gram = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.68 × 10²³ atoms × 1 mole /6.022 × 10²³ atoms
0.445 mol
Mass in gram;
Mass = number of moles × molar mass
Mass = 0.445 mol × 40 g/mol
Mass = 17.8 g
How does the fuel become more radioactive?
Answer:
I think it's B
Explanation:
I took the exam
What is the molecular formula of the compound with a molecular weight of 112 g/mol and percent composition: 85.6% C and 14.4% H?
Select one:
a. C2H4
b. CH2
c. C4H8
d. C8H16
Answer:
Molecular formula = C₈H₁₆
Explanation:
Given data:
Percentage of hydrogen = 14.4%
Percentage of carbon = 85.6%
Molecular formula = ?
Molecular weight = 112 g/mol
Solution:
Number of gram atoms of H = 14.4/ 1.01 = 14.26
Number of gram atoms of C = 85.6/ 12 = 7.13
Atomic ratio:
C : H
7.13/7.13 : 14.26/7.13
1 : 2
C : H = 1 : 2
Empirical formula is CH₂
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
n = 112 / 14
n = 8
Molecular formula = n (empirical formula)
Molecular formula = 8 (CH₂)
Molecular formula = C₈H₁₆
In an experiment, what responds to the change of the independent variable?
Answer:
Independent Variable
Explanation:
PLEASE HELP! ITS URGENT! I GIVE BRAINLY
Using the Law of Conservation of Matter, determine the number of grams of iron sulfide (FeS) that will be produced in this reaction.112g Fe + 64g S → _____ g FeS *
a. 48g
b. 64g
c. 112g
d. 176g
Answer:
Its C
Explanation:
If you think about it logically all the other answers don't make sense A and B are to small of a number And D is to Big of a number
Hope this Helps!!
A force between an object and the surface it is moving over, is known as what?
power
O velocity
O force
O friction
PLS HELP ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Neptune
What is the orbit of the Neptune?
Is the Sun at the center of the Nepturn’s orbit?
Describe the motion of Neptune throughout its orbit? Does it move at constant speed?
Answer: with what
Explanation:???
Answer:
165 years.
Neptune completes one orbit around the Sun for every 164.79 orbits of Earth.
Explanation:
a school bus drives 35 mph down the street and slows as it approaches the stop sign
i will give braniliest
During World War II, the Nazi government in Germany imprisoned and murdered millions of Jews. This is known as the _____.
A.Fascism
B.Holocaust
C.Nationalism
D.Great Depression
Answer:
B
Explanation:
What would happen to the rate of a reaction with rate law rate = k [NO]^2[H2] if
the concentration of NO were halved?
A. The rate would be four times larger.
B. The rate would also be halved.
C. The rate would be one-fourth.
D. The rate would be doubled.
The rate of a reaction would be one-fourth.
Further explanationGiven
Rate law-r₁ = k [NO]²[H2]
Required
The rate of a reaction
Solution
The reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time.
Can be formulated:
Reaction: aA ---> bB
[tex]\large{\boxed{\boxed{\bold{v~=~-\frac{\Delta A}{\Delta t}}}}[/tex]
or
[tex]\large{\boxed{\boxed{\bold{v~=~+\frac{\Delta B}{\Delta t}}}}[/tex]
The concentration of NO were halved, so the rate :
[tex]\tt r_2=k[\dfrac{1}{2}No]^2[H_2]\\\\r_2=\dfrac{1}{4}k.[No]^2[H_2]\\\\r_2=\dfrac{1}{4}r_1[/tex]
Answer:
C. The rate would be one-fourth.
Another option would be:
The rate would be four times larger
Depending on what class you're taking.
Explanation:
please please help me i’m so confused! i will give brainleiest answer
{calcium nuclear charge 20+}
{calcium atomic mass 40amu}
1) determine the number of charged particles in the nucleus of calcium atom then deduce the number of electrons
{given the relative charge of a proton =1+\m 1 nucleon = 1amu}
2) determine its mass number A
3) determine the competition of this calcium atom
Answer:
PLEASE MARK AS BRAINLIEST!!
Explanation:
Calcium has an atomic number of 20 and an atomic mass of 40
The mass number of an isotope is the sum of the number of protons and neutrons in the atomic nucleus. The atomic number is the number of protons. The calcium-40 isotope has a mass number of 40 , and an atomic number of 20 , therefore it has 20 protons.
PLEASE SOMEONE HELP ME ANSWER THIS!!!! i’m desperate:,,(
Answer:
See detailed solution below
Explanation:
Now, let us solve each question step by step.
1) Given that;
N = amount of radioactive material at time t
No= amount of radioactive material originally present
t = time required for N amount of radioactive material to remain
t1/2= half life of the radioactive material
So,
N/No = (1/2)^t/t1/2
N/60 = (1/2)^22.8/3.8
N/60= (1/2)^6
N/60=1/64
64 N = 60
N = 60/64
N = 0.9 g
2) N/No = (1/2)^t/t1/2
N/8 = (1/2)^103.2/34.4
N/8 = (1/2)^3
N/8 = 1/8
8N = 8
N = 1 L
3) N/No = (1/2)^t/t1/2
50/No = (1/2)^18/6
50/No = (1/2)^3
50/No = 1/8
No = 50 * 8
No = 400 micrograms
4) N/No = (1/2)^t/t1/2
62.5/500 = (1/2)^26/t1/2
0.125 = (1/2)^26/t1/2
Since 0.125 = 1/8
1/8 = (1/2)^26/t1/2
(1/2)^3 = (1/2)^26/t1/2
Hence;
3 = 26/t1/2
t1/2 = 26/3
t1/2 = 8.7 hours
........URGENT PLEASE HELP............
Answer:
12.0778
Explanation:
idk helpppppppppppppp
Maybe Sugar I did that question before I think.
Answer: D
Explanation:
D is the correct answer since all of the others are basically food, depending on who eats them. Just read the little description before you try to answer the question so you won’t get confused next time.
Choose the correct one plz!
Answer:
b
Explanation:
Answer:
13 N to the right
Explanation:
Mercury is an element that forms during _____
Answer:
forms of mercury
Explanation:
Answer:
Explanation:
Mercury is an element and a metal that is found in air, water, and soil.Mercury rarely occurs uncombined in nature, but can be found as droplets in cinnabar (mercury sulfide) ores. China and Kyrgyzstan are the main producers of mercury. The metal is obtained by heating cinnabar in a current of air and condensing the vapour.
hope this helps! Have a good day or night! :)
Chemical Equations :p
Explanation:
4NH₃ (g) + 5O₂ (g) → 4NO (g) + 6H₂O (g) Ba(ClO₃)₂ (s) → BaCl₂ (s) + 3O₂ (g) 2Al (s) + 3Zn(NO₃)₂ (aq.) → 3Zn (s) + 2Al(NO₃)₃ (aq.) 2C₈H₁₈ (g) + 25O₂ (g) → 16CO₂ (g) + 18H₂O (g)what is the structural formula of propene
Explanation:
Structural formula of propene
H₃C–CH₂=CHmolecular formula = C₃H₆
molecular mass = 12×3+1×6 = 36+6 = 42
no. of double bond = 1
In diamond, each carbon atom is covalently bonded to four other carbons in a
a. Polyhedron
b. Hexagon
c. Pentagon
d. Tetrahedron
Answer:
Tetrahedron
Explanation:
Each carbon atom in a diamond is covalently bonded to four other carbons in a tetrahedron. These tetrahedrons together form a three-dimensional network of six-membered carbon rings in the chair conformation, allowing for zero bond-angle strain.
The sum of all the potential energy and kinetic energy in an object is equal to it's
Answers Choices: A. Thermal Energy B. Kinetic Energy C.Potential Energy D. Force PLEASE HELP DUE TODAY
Answer:
B. kinetic energy
Explanation:
The sum of kinetic energy and potential energy of an object is its total mechanical energy.
Need help!!! Don’t understand
Which substance is a homogeneous mixture? (3 points)
Cereal
Silver
Nickel
Shampoo
Answer:
Shampoo
Explanation:
Its a homo mixture because if you look at the way it is mixed you will
know it is a homogeneous mixture
What is the kinetic energy of 3500 kg bus that is moving at 25 m/s
Answer:
1093750 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
v is the velocity
m is the mass
From the question we have
[tex]k = \frac{1}{2} \times 3500 \times {25}^{2} \\ = 1750 \times 625 \\ = 1093750 \: \: \: \: \: [/tex]
We have the final answer as
1,093,750 JHope this helps you
Formula for the compound that contains Mg2+ and O2-
Answer:
MgO.
Explanation:
charges of both satisfy one another (balanced) -- producing a compound MgO.
The properties of matter depend on the types of atoms a substance is made of.
true of false?
true 100% i just had a quiz on this.
What physical property can be used to distinguish between a 1 cm cube of copper
and a 1 cm cube of sugar?
Select one:
a size
b. lustre
C. cost
d state
State physical property can be used to distinguish between a 1 cm cube of copper and a 1 cm cube of sugar. Hence, option D is correct.
What is physical property?A property (such as colour, hardness, boiling point) of the matter is not involved in its manifestation of a chemical change.
Physical properties are those general properties you notice most readily about a substance, such as its size, state of matter (solid, liquid, or gas), colour, mass, density and strength.
Values for physical properties can be determined by tests that don't alter the substance being tested.
Hence, state physical property can be used to distinguish between a 1 cm cube of copper and a 1 cm cube of sugar.
Learn more about the physical property here:
https://brainly.com/question/18327661
#SPJ2
What are some examples of HIGH resistance? Question 2 options:
long wire, wide wire, more resistors
wide wire, short wire, less resistors
long wire, narrow wire, more resistors
narrow wire, less resistors, long wire
(PLEASE HURRY! I NEED TO FINISH THIS QUIZ)
Answer:
long wire, wide wire, more resistors
long wire, narrow wire, more resistors
Explanation:
longer wires have greater resistance. The longer the wire the greater the resistance.
The answer is Long wire, Narrow wire, more resistors
Evidence:
Gregor Mendel studied the traits of pea plants. Because of his contributions, he is known as the Father of?
Answer:
A monk, Mendel discovered the basic principles of heredity through experiments in his monastery's garden. His experiments showed that the inheritance of certain traits in pea plants follows particular patterns, subsequently becoming the foundation of modern genetics and leading to the study of heredity.
Explanation:
Answer:
Gregor Mendel (July 20, 1822 - January 6, 1884), is known as the Father of Genetics, is most well-known for his work with breeding and cultivating pea plants, using them to gather data about dominant and recessive genes.
Explanation:
You asked, I answered.
Hope this helped! :)
Aluminum nitrate reacts with sodium hydroxide to form a precipitate of aluminum hydroxide. What mass of aluminum hydroxide will precipitate when 35.5 mL of 0.145 mol/L aqueous aluminum nitrate is mixed with 44.2 mL of 0.215 mol/L aqueous sodium hydroxide?
Answer:
The mass of aluminum hydroxide that will precipitate when 35.5 mL of 0.145 mol/L aqueous aluminum nitrate is mixed with 44.2 mL of 0.215 mol/L aqueous sodium hydroxide is approximately 0.247 grams
Explanation:
The given parameters are;
The volume of 0.145 mol/L aqueous aluminum nitrate in the reaction = 35.5 mL
The volume of 0.215 mol/L aqueous sodium hydroxide in the reaction = 44.2 mL
The balanced chemical equation for the reaction is given as follows;
Al(NO₃)₃ (aq) + 3NaOH (aq) → Al(OH)₃ (s) + 3NaNO₃ (aq)
Therefore;
1 mole of Al(NO₃)₃, reacts with 3 moles of NaOH to form 1 mole Al(OH)₃, and 3 moles of NaNO₃
The number of moles of aqueous aluminum nitrate in the reaction = 35.5/1000 L × 0.145 mol/L = 0.0051475 moles
The number of moles of aqueous sodium hydroxide in the reaction = 44.2/1000 L × 0.215 mol/L = 0.009503 moles
Therefore, 0.009503 moles NaOH will react with 0.009503/3 moles Al(NO₃)₃ to form 0.009503/3 moles of aluminum hydroxide precipitate
The molar mass of aluminum hydroxide = 78 g/mol
Therefore, 0.009503/3 moles of aluminum hydroxide weighs 78 × 0.009503/3 = 0.247078 grams
The mass of aluminum hydroxide that will precipitate out ≈ 0.247 grams.