Answers
Answer:
In Test 1 the person substantially did better and either had better knowledge of the subject or studied for it more then they did for Test 2.
Explanation:
Related Questions
5. Element X has two isotopes: X-100 and X-104. If the atomic mass of X is 101
amu, what is the relative abundance of each isotope in nature?
Answers
Answer:
The abundance of X-100 is 75 percent, and X-104 has an abundance of 25 percent. The answers are found by solving two equations with two unknowns, which are A plus B equals 100, and 100A plus 104B equals 10,100.
The relative abundance of each isotope in nature
X-100 = 75%
X-104=25%
By dividing the total number of ions identified by the number of ions with a particular m/z m/z m/z ratio, one may determine the relative abundance for each individual ion in the sample.
How can the abundance of two isotopes be determined?
For chemistry problems involving relative abundance, use the following formula:
(M1)(x) + (M2)(1-x) = M (E)
Find the relative abundance of the isotopes if one nitrogen isotope, nitrogen-14, has a mass of 14.003 amu and another, nitrogen-15, has a mass of 15.000 amu.
Algebra can be used to find x. ...
x = 0.996
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The electronegativity of an atom generally _____ going up columns and _____going right to left across rows. An element like calcium
would most likely form a(n) _____ bond with an element like nitrogen.
1. increases: increases: covalent
2. increases; increases : ionic
3. increases; decreases : ionic
4. decreases; decreases ionic
5. decreases: increases : ionic
6. decreases; increases covalent
7. decreases; decreases covalent
8. increases; decreases : covalent
Answers
Answer:
8
Explanation:
It increases going up, because atom size is smaller, with greater energy levels; going right to left decreases, because they will have smaller charges when going through right to left.
Then, Calcium (Ca) is non-metal that reacts with Nitrogen (N), a non-metal. When 2 non-metal elements become a compound, it's covalent. Therefore, the bond between both of the elements are covalent.
Help please 20 points and brainliest
Answers
Answer:
For homogeneous:
Filteration, vaporization, and a reverse chemical reaction
Explanation:
1) precipitation/crystallization reactions - if one of the components can form a solid salt when the solution undergoes several factors (concentration change, temperature change, etc); separation can be done either by filtration, centrifugation, or simple decantation.
(2) chromatography - separation can be based on the mobility of the phases (liquid chromatography, gas chromatography, ion-exchange, etc.)
(3) solvent extraction - if the components are both liquid, separation based on their relative solubilities
(4) distillation - separation based on different boiling points.
(5) magnetic separation - if one of the components have magnetic properties.
(6) electrophoresis - separation of organic molecules based on the type of gel used
heterogeneous:
Main methods of separation of heterogeneous mixtures
- Magnetic separation
- Sublimation
- Decantation
Liquid-solid mixture
Liquid-liquid mixture
- Filtration
- Centrifugation
Themes of interest
Which have different numbers of electrons?
different ions of an element
different isotopes of an element
the nucleus of an element
each of the atoms of an element
Answers
Answer: different ions of an element, the answer is A
Explanation: Took the quiz
Answer:
different ions of an element, the answer is A
Explanation:
edge 2022
How bad of alcoholic do you have to be to have your brain affected
Answers
Answer:
Alcohol in Your Body
Alcohol reaches your brain in only five minutes, and starts to affect you within 10 minutes. After 20 minutes, your liver starts processing alcohol. On average, the liver can metabolize 1 ounce of alcohol every hour.
Explanation:
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9 ml of a sugar solution was mixed with 3 ml of a 76% sugar solution to make a 73% sugar solution. Find the percent concentration of the first solution.
Answers
Solving:
9x + 0.76(3) = 0.73(12)
9x + 2.28 = 8.76
9x = 6.48
x = 0.72 or 72%
How many moles are in 6.20 x 10^24 molecules of H2O?
Answers
Answer:
10.3 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{6.20 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 10.299003[/tex]
We have the final answer as
10.3 molesHope this helps you
What is the most common ion charge of chromium? Where on the periodic table?
Answers
Answer:
i
Explanation:
The most common oxidation states of chromium are +6, +3, and +2. On the metal area of the periodic table.
Explanation:
3. A sample of carbon has a mass of
0.000000000000000-0034 kg. Express
this mass in scientific notation.
Answers
[tex] - 34 {}^{15} [/tex]
The power of -34 will be 15 because 15 zeroes are given....Explain why, at room temperature, CO2 is a gas and CS2 is a liquid. You may use diagrams as part of your explanation.
Answers
Explanation:
A. Hydrogen bonding is present in CS2 but not in CO2.
B. CS2 has greater dipole moment than CO2 and thus the dipole-dipole forces in CS2 are stronger.
C. CS2 partly dissociates to form ions and CO2 does not. Therefore, ion-dipole interactions are present in CS2 but not in CO2.
D. The dispersion forces are greater in CS2 than in CO2.
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Which property accounts for the fact that atoms can be identified by an examination
of the emission spectrum?
A. Each kind of atom has a different mass number.
B.Each kind of atom has a different atomic number.
C.Each kind of atom has a different isotopes.
D. Each kind of atom has a characteristic difference in energy levels for electrons.
Answers
Answer:
Explanation:
D is the answer
Each kind of atom has a characteristic difference in energy levels for electrons, this property accounts for the fact that atoms can be identified by an examination, therefore the correct answer is option D.
What is the photoelectric effect?It is the process of emission of electrons from the material because of absorption of electromagnetic radiation in form of photons of light waves.
The photoelectric effect explains the particle behavior of the light waves.
Each kind of atom has a characteristic difference in energy levels for electrons this fact can be used to identify the different atoms by using inspection.
Thus, the correct answer is option D.
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What charge would an ion have if it had more electrons than protons?
A. It would have a net positive charge.
OB. It would have no charge.
C. It would have a net negative charge.
Ο Ο
D. It would be neutral, since electrons would be outside the nucleus.
Answers
Answer:
it will have a net negative charge and it is known as anion
I need help with this , here are the words ( black,radiation, time, holes and universe
Answers
carbon dioxide + Calcium Carbonate =?
Answers
Answer:
calcium carbonate deteriorates, delivering carbon dioxide gas and leaving behind calcium oxide a white solid. Over the long haul, this responds with carbon dioxide noticeable all around to frame gems of calcium carbonate, which lock the sand grains together to shape a hard rock-like material
Explanation:
Answer:
calium bicarbonate
Explanation:
5. _______ is the combining capacity of atom with other atoms to form a molecule or a compound .
Answers
Answer:
valancy
Explanation:
what is the name of the ionic compound made of beryllium and chlorine?
Answers
Answer:
beryllium chloride
Explanation:
Therefore a compound made from beryllium and chlorine will be named beryllium chloride.
If a cell has 4 chromosomes at the beginning of meiosis, how many chromosomes will be in each cell at the end of meiosis?
Answers
Answer:2. Mitosis would produce identical daughter cells with the same number as the parent cell. Meiosis would product sex cells with one-half the amount of genetic material as the parent cells.
Explanation:
If a cell has 4 chromosomes at the beginning of meiosis then the daughter cell will have TWO chromosomes at the end of meiosis.
Meiosis is a type of reductional cell division by which a parental cell duplicates its genetic material (DNA) and then divides twice to produce four (4) daughter cells having half of the genetic material.These successive cell division cycles are known as Meiosis I and Meiosis II.Meiosis is a sexual mode of reproduction that produces gametes or geminal cells, which fuse during the process of fertilization to form a zygote.
In conclusion, if a cell has 4 chromosomes at the beginning of meiosis then the daughter cell will have TWO chromosomes at the end of meiosis.
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with increasing altitude, air density also increases... true or false
Answers
Answer:
false
Explanation:
Cual es la convención de 746 Hm
Answers
Answer:
75.6
Explanation:
756x0.1=75.6
1 d =hm=0.1
The energy of motion is known as potential energy.
Question 1 options:
True
False
Answers
Answer:
False
Explanation:
This is because potential energy is energy that it not used yet.
A HOMOGENEOUS LIQUID THAT CANNOT BE SEPARATED INTO ITS COMPONENTS BY DISTILLATION BUT CAN BE DECOMPOSED BY ELECTROLYSIS IS CLASSIFIED AS A/AN _______________.
ELEMENT
SUBSTANCE
COMPOUND
SOLUTION
Answers
Answer:
ELEMENTS
Explanation:
CUZ AN A
ELEMENT IS A GROUP OF ATOMS THAT CANNOT BE BROKEN DOWN BY ANY CHEMICAL OR PHYSICAL MEAN
1 An atom has 24 protons, 22 electrons, and 28 neutrons. What is the atomic number of the atom?
Answers
Answer:
24
Explanation:
Who created the "plum pudding model" of the atom?
Thomson
Rutherford
Crooks
Chadwick
Answers
Can someone please tell me the answer on this. First person to answer will most definitely be marked brainliest so please just tell me the answer. The deadline is in 5 MINUTES!!
Answers
particles, high, low, oxygen, waste, carbondioxide, fast.
is this statement true or false? the chinese knew how to produce silk by about 2700 b.c.
Answers
Answer:
its true
Explanation:
I took the test
Convert 3,124,991 centimeters (cm) to miles (mi) rounding to 4 sig figs
Answers
Answer:
19.417794 mi
Explanation:
Answer:
19.41
Explanation:
What do all cations have in common? Check all that apply.
A. positive
B. negative
C. metals
D. non-metals
Answers
Answer:
B
Explanation:
All cations have more protons than electrons so they always have a positive charge.
Which of the following is an observation of a chemical property?
zinc reacts with hydrochloric acid
water boils at 100°C.
density of wood is 0.51 g/cm3
sand paper is roughly textured
Answers
3. Connect the electron configuration of Columns 6 (Oxygen) and 7 (Fluorine) with the
tendency to gain or lose valence electrons easily and the strength of the tendency for
electronegativity.
Answers
Answer:
I DON'T KNOW
Explanation:
I DON'T KNOW
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*20 points* Pls answer questions in a positive way NO LINKS NO FILES Thank you
Answers
Answer:
A compound is a substance made of two or more different atoms which are chemically combined(Option B)A mixture is made of two or more substances that are not chemically combined (OptionB)Explanation:
Example of compound(CO)
Example of mixture(Milk)