Answer:
a. 69.5% and 30.5%
Explanation:
we know there are two naturally occurring isotopes of Mg, Mg-24 and Mg-25.
First of all we will set the fraction for both isotopes
X for the isotopes having mass 25
1-x for isotopes having mass 24
The average atomic mass of Mg is 24.305 amu.
we will use the following equation,
25x + 24 (1-x) = 24.305
25x + 24 - 24x = 24.305
25x- 24x = 24.305 - 24
1x = 0.305
x= 0.305 /1
x= 0.305
0.305 × 100 = 30.5 %
30.5 % is abundance of Mg-25 because we solve the fraction x.
now we will calculate the abundance of Mg-24.
(1-x)
1-0.305 =0.695
0.695 × 100 = 69.5%
69.5% for Mg-24.
What is an ion? Write its types with example.
Answer:
an ion is an element that carries either positive or negative charge. the example are cation which has a positive charge e.g H+ and anion which had a negative charge eg Cl-.
Which of the following elements has properties different than the rest?
K
O
H
N
Answer:
N
Explanation:
the rest are metals. elements of group 1 and 2
What is Electron configuration for a tin atom in the excited state and why
When the tin atom is excited, then the tin atom absorbs energy. As a result, an electron in the 5s orbital jumps to the 5pz orbital.
What is meant by tin atom?The electron configuration exists in the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
tin (Sn), a chemical element belonging to the carbon family, Group 14 (IVa) of the periodic table. It is a soft, silvery white metal with a bluish tinge, known to the ancients in bronze, an alloy with copper. Tin is widely used for plating steel cans used as food containers, in metals used for bearings, and in solder.When the tin atom is excited, then the tin atom absorbs energy. As a result, an electron in the 5s orbital jumps to the 5pz orbital.
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Calculate the number grams present in each sample below.
15 moles NO2
Answer:
Ok 15 miles NO2 you need the salt and pepper trick so mix it add water sit in it when you get cold write down uh temperature then you need to get out or it may kill you when it starts to get cold then go to the y- axis then you need to ask your teacher for help after you do the y-axis
pls helpp
An unknown substance with a mass of 23.5 grams absorbs 419.7 J while undergoing a temperature increase of 76.0°C. What is the specific heat of the substance?
The specific heat of the substance : c = 0.235 J/g °C
Further explanationGiven
Heat absorbed by substance = 419.7 J
m = mass = 23.5 g
Δt = Temperature difference : 76 °C
Required
The specific heat
Solution
Heat can be formulated
Q = m.c.Δt
Input the value :
419.7 = 23.5 x c x 76
c = 419.7 : (23.5 x 76)
c = 0.235 J/g °C
I have it attached plz help ASAP
Answer:
The answer would most likely be C
56ude67fv67gbubvtyfg help PLS
Answer:
p=5.0g/cm³
Explanation:
density formula
p=m/v
And if im not mistaken the stone weighs 200grams
The Volume of the tube increases by 40
So
p=200/40
p=5.0g/cm³
A 32-year-old man presents describing an intense fear of germs. He continually
experiences thoughts about contracting an illness by coming into contact with things in
the environment, such as doorknobs or seats in public places. His intense fear of germs
has resulted in repetitive hand washing. He describes brief relief after hand washing but,
because his thoughts about contamination keep returning, he states that he "cannot help
but wash again for hours a day" Both of his hands are red, raw, and cracked and he had to
leave his job because of his fear of sitting down in public places,
Help please
What percentage of the world does not have a reliable source for clean water?
Answer:9%
Explanation:
What are the two energy of the electrons outside the nucleus
Answer:
Unlike protons and neutrons, which are located inside the nucleus at the center of the atom, electrons are found outside the nucleus. Because opposite electric charges attract each other, negative electrons are attracted to the positive nucleus
The picture below shows a sample from a tree.
What kind of tree is this?
Answer:
I believe it is Spruce, because of the shape of the leaves
Answer:
Explanation:
Spruce
The point of a cell division is to? a) copy tissue b) common cell c) neuron d) all choices are true
Answer: a) copy tissue
Explanation:
Tissue and cells in general get damaged, or just break down from wear and tear. So the cells divide to make up for this shortcoming, effectively replacing any broken parts with fresh new ones.
What is a compound formed by the sharing of electrons called? I NEED THIS DONE RIGHT NOWWW
Answer:
Covalent bonds
Explanation:
Answer:
Covalent bonds
Explanation:
Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms.
Hope this helps :)
Please help me out if your good at science:)ill mark brainliest if correct
A. It helps people stay in touch with friends who live far away.
B. It helps track objects in motion.
C. It helps see microscopic cells at work.
D. It helps diagnose health problems.
I need to know what is Mitosis ♀️
Answer:
a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
Explanation:
Which orbital notation represents the second principal energy level of a silicon atom in the ground state?
Answer:
2
Explanation:
Silicon is one the elements found in nature and well positioned the periodic table.
It has an atomic number of 14 with an electronic configuration:
1s² 2s² 2p⁶ 3s² 3p⁴
From this formula the orbital notation that represents the second principal energy level is 2.
The main energy level in which the orbital is located or the average distance of the orbital from the nucleus is the principal quantum number.
It takes the number 1,2,3,4,5 e.t.c
A 4.50 g sample is analyzed and found to contain 3.22 g of carbon, 0.300 g of hydrogen, 0.221 g of nitrogen, and the rest is oxygen. The molar mass of the actual compound is found to be 285 g/mol. Find the empirical formula and then the molecular formula.
The empirical formula and the molecular formula are the same : C₁₇H₁₉NO₃
Further explanationGiven
3.22 g of carbon, 0.300 g of hydrogen, 0.221 g of nitrogen, and the rest is oxygen.
Required
The empirical formula and then the molecular formula.
Solution
Mass of Oxygen = 4.5 - (3.22+0.3+0.221)=0.759 g
Mol ratio of elements C : H : N : O =
3.22/12 : 0.3/1 : 0.221/14 : 0.759/16 = 0.268 : 0.3 : 0.016 : 0.047
Divide by 0.016 :
16.75 : 18.75 : 1 : 2.9375 = 17 : 19 : 1 : 3
(C₁₇H₁₉NO₃)n = 285
(12.17+19+14+3.16)n = 285
(285)n = 285
n = 1
Then the empirical formula and the molecular formula are the same
Explain intermolecular forces cause water molecules to stick to a material like a glass pitcher
Answer:
Cohesive forces cause the water molecules to stick together with a lot of elasticity, allowing the water to function very much like a rubber into a material like a glass pitcher.
Intermolecular forces such as dipole-dipole forces, London dispersion forces exist between molecules and these depend on strength of electronegativity of molecule. Therefore, cohesive forces cause water molecules to stick to a material like a glass pitcher.
What is intermolecular forces of attraction?Intermolecular forces of attraction is force of attraction that make two molecule come closer. Intermolecular forces of attraction is directly proportional to the electronegativity of the molecule.
Cohesive forces cause the water molecules to stick together with a lot of elasticity, allowing the water to function very much like a rubber into a material like a glass pitcher.
Therefore, cohesive forces cause water molecules to stick to a material like a glass pitcher.
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Calculate the current needed to provide 30000C of electricity In 5 minute
Help science loook at pictureeee
Answer: Convection current
Explanation:
Answer:
convection currents
Explanation:
A mountain ridge is a geological chain of mountains and/or hills
The diagram shows a convection current
Thermal conductivity is the ability to transfer ___.
Answer:
Thermal conductivity (often denoted by k, λ, or κ) refers to the intrinsic ability of a material to transfer or conduct heat.
Thermal conductivity is the ability to transfer heat.
Thermal conductivity is the measure of the capacity of a material to conduct heat. Materials with high thermal conductivity can transmit heat quickly, while materials with low thermal conductivity will transmit heat slowly or resist its movement altogether. Heat transfer is the movement of heat from one object or substance to another because of a difference in temperature. Heat can move by conduction, convection, and radiation.
The rate at which heat is transferred through a unit cross-section area of a material by conduction when a temperature gradient exits perpendicular to the area is known as thermal conductivity.
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Hi
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Is anybody see my princess i mean sara
Answer:
hi I dont see princess or sara but have a good day!
Answer:
Hola chica
¿Qué paso?
Dimelo
Which of these choices describes a segment of
DNA that determines a specific trait in a person,
such as attached earlobes?
A. a gene
B. a phenotype
C. a chromosome
D. a characteristic
Please help ..
Help with this instruction booklet
3) Convection can only happen in what? *
Answer:
Convection can only happen with liquids and gases.
Hope it helps :)
6. A family decided to take a trip to Europe. The plane they took flew at an average speed of 500 miles per hour
during the flight. The plane covered a distance of 5,000 miles during the flight. How long was the flight?
Your answer
Answer:
10 hours
Explanation:
Answer:
10
Explanation:
Which is a property of all atoms?
a. More electrons than protons
b. A nucleus with a positive charge
c. A positively charged electron cloud
d. Same number of protons as neutrons
Name the type of food additive that stops the food reacting with oxygen.
Answer:
Antioxidants such as vitamin C are preservatives by inhibiting the degradation of food by oxygen. Bulking agents such as starch are additives that increase the bulk of a food without affecting its taste.
PLS HELP!!
Balance this equation: __H2+ 2 O2---> 2 H2O
Answer:
2H₂ + O₂ → 2H₂O
Explanation:
The expression of the equation is given as:
_H₂ + 2O₂ → 2H₂O
Now for expression above,
Reactants Products
H 2 4
O 4 2
to balance the equation, we use 2 moles of hydrogen gas and 1 mole of oxygen gas;
2H₂ + O₂ → 2H₂O
What is the pauli exclusion principle and how does it apply to electron configuration?
Answer:
pauli exclusion principle states that no two electrons in the same orbital can have the same spin.
Explanation:
this means you can't have 2 up arrows or 2 down arrows in your box