Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium
Answer:
85.556 amu
Explanation:
From the question given above, the following data were:
Isotope A (85–Rb):
Mass of A = 85 amu
Abundance (A%) = 72.2%
Isotope B (87–Rb):
Mass of B = 87 amu
Abundance (B%) = 27.8%
Average Atomic mass of rubidium =?
The average atomic mass of rubidium can be obtained as follow:
AVERAGE = [(Mass of A × A%)/100] + [(Mass of B × B%)/100)]
AVERAGE = [(85 × 72.2)/100] + [(87 × 27.8)/100]
= 61.37 + 24.186
= 85.556 amu
Therefore, the average atomic mass of rubidium is 85.555 amu
Fun fact
An apple, potato, and onion all taste the same if you eat them with your nose plugged weird but yeah
Answer:
oh rlly
Explanation:
didn’t know about that. Hope u have a good day!!
Mole Conversion:Find the number of moles in 384g of cobalt.
Explanation:
jduehfjfbxu zodndifdienxieb7dnf
What month and what year did Matthias Schleiden contribute to the cell theory.
Plsssssssss help
Answer:
Matthias Jacob Schleiden was a German botanist who, with Theodor Schwann, cofounded the cell theory. In 1838 Schleiden defined the cell as the basic unit of plant structure, and a year later Schwann defined the cell as the basic unit of animal structure.
Explanation:
Will Mark Brainliest!
There are several ways to model a compound. One type of model is shown.
4 C's are connected in a line by 3 black lines. The C on the left has 3 H's attached to it each by a black line. The next C has 1 H attached by a black line and 1 O attached by 2 black lines. The next C has 2 H's attached to it by 1 black line each. The last C has 2 H's attached to it by 1 black line each and 1 O attached by a single black line. That O has an H attached to it by 1 black line.
What is the chemical formula for the molecule represented by the model?
CHO
C4H9O2
C4H8O
C3H8O2
Answer:
C₄H₉O₂
Explanation:
just count the amount of atoms present in the model.
Answer:
there now u can give him/her brainliest!! :)
Explanation:
Jenny knows that the atomic number of the element potassium, K, is 19. She also
knows that the average atomic mass can be used to find out how many neutrons
are in most atoms of an element. If the average atomic mass of potassium is
39.098, how many neutrons are found in most atoms of potassium?
A. 19
B. 20
C. 39
D. 40
Answer:
c. 39
Explanation:
You round the number 39.098 to make it easier. Since you can't round it up to forty because the number after the 9 in-front of the decimal is a over i is unable to be rounded up
1 point
2. If two different balls were kicked with the same force, which ball would
go the furthest?
The ball with the smaller mass
The ball with the larger mass
The smaller ball
The larger ball
Answer:The ball with the smaller mass
Explanation:
A laboratory investigation included examining prepared slides of pond water. Single-celled organisms with a nucleus and either cilia or flagella were visible. These organisms probably belong to kingdom
Answer:
Protista
Explanation:
The organisms would probably belong to the kingdom Protista.
Organisms in the Protist kingdom are unicellular and animal-like. They possess all the attributes of animals except the fact that they are unicellular. They are different from fungi in being mobile and being able to ingest their foods. Unlike monera, protists are eukaryotic and unlike plants, most protists are heterotrophic (except euglena).
The cells of protists possess nuclei and locomotive structures such as pseudopodia (e. amoeba), cilia (e.g paramecium), and flagella (e.g euglena).
Hence, the organisms seen on the prepared slides of pond of water would probably belong to the Protist kingdom.
These organisms belong to the Kingdom known as Protista.
Protists are referred to eukaryotes which are mostly unicellular(single-celled) and examples include
AmoebaFlagellates CiliatesSporozoans.They are also microscopic and can't be seen with the naked eyes. In this
scenario, we were told that the pond contains single-celled organisms which
have cilia and flagella . This depicts that the organisms fall under the
kingdom Protista.
Read more on https://brainly.com/question/20799245
a student lists three temperature measurements 100 f , 100 c, and 100 k of the highest temps 100 k is the highest true or false
Answer:
False, it is actually 100 kelvins
Explanation:
what is the term used to describe a pattern of stars in the night sky?
Answer:
The term used to describe a pattern of stars in the night sky is constellations, but to be more accurately, a group of stars that forms a pattern in the sky is called an asterism.
How is energy transferred when..
Answer:
Number 1 is Conduction. Number 2 is Radiation. Number 3 is Convection. i think if thats how im supposed to word it...
Explanation:
Answer:
1. Each collision passes energy from particles moving quickly to particles moving slowly. In this way, the energy spreads throughout the pan and finally reaches the handle. This process is called conduction. Conduction is the transfer of heat that happens when particles collide with each other.
2. A fire spreads by transferring heat energy in three ways: Radiation, Convection, and Conduction. Radiation refers to the emission of energy in rays or waves. Heat moves through space as energy waves. ... This is the reason that when facing the fire, only the front is warmed.
3. The ways in which energy is dissipated depends on the system: ... for a tumble dryer, the electrical work is transferred into useful internal (thermal) energy which helps to dry clothes and energy is dissipated wastefully by sound waves which cause a rise in the internal energy store (temperature) of the surroundings.
Explanation:
Hope this is what you were looking for! Brainliest please?
Question:
Type your driving question here:Why are the northern lights produced? How many light reveal the
behavior of electrons in atoms
Claim:
What is the answer to the question? (1 sentence)
Type your claim here:
I
Supporting Evidence #1:
How do you know your claim is the answer to the
question? (The facts that support the claim.)
Type your evidence here (1-2 sentences):
Supporting Evidence #2:
How do you know your claim is the answer to the question?
(The facts that support the claim.)
Type your evidence here (1-2 sentences):
Answer:
What?
Explanation:
What is an atom?
Hshshdgwbdhwjshdhshshsbsh
Which of the following relationships is true?
Ok pH - pОН = 14
Ка * К = 1x 10:14
с рка * pKb = 14
рка *рк = 1x 1014
Answer:
reeeee
Explanation:
2mnd one
An ion of an element can have the same ________ as another element.
Answer:
Number of electrons.
Explanation:
I hope this helps.
An ion is said to be the molecule or the atom that has the presence of a net electrical charge over them. An ion can have the same protons as the other elemental atom. Thus, option A is correct.
What is an ion?An ion is defined by the atom or the molecule with an electrical charge of positive and negative on them due to the gain or the loss of the electron in their orbits for the bond formations and stability.
The ions of the atom have the same number of protons in their nucleus but the number of the electrons varies as they looses and gain electron to acquire the positive and the negative charge over them.
The presence of the extra or less electron in the orbit or the shell of the atom makes them reactive and allows the electrostatic attraction between them for the bond formation.
Therefore, in option A. the protons are the same in an ion.
Learn more about ions here:
https://brainly.com/question/3110170
#SPJ2
Your question is incomplete, but most probably your full question was,
An ion of an element can have the same as another element.
A. number of protons
B. None of these
C. electron configuration
D. atomic mass
In the reaction A + B -> C + D, what are the products?
A. A and B
B. A, B, C, and D
C. C and D
D. A and C
Answer:
C
Explanation:
just took the test
How many atoms are in a sample of silver if the sample had a mass of 1243 g ?
Answer:
69.37×10²³ atoms of silver
Explanation:
Given data:
Mass of sample = 1243 g
Number of atoms of silver = ?
Solution:
Number of moles of silver:
Number of moles = mass/molar mass
Number of moles = 1243 g/ 107.87 g/mol
Number of moles = 11.52 mol
Number of atoms:
According to Avogadro Law,
1 mole contain 6.022×10²³ atoms
11.52 mol × 6.022×10²³ atoms / 1mol
69.37×10²³ atoms
WIl mark brainliest
Which example has the least kinetic energy
Question 2 options:
a 1 kg rock rolling down a hillside at 1 m/s.
a 10 kg rock rolling down a hillside at 100 m/s.
a 100 kg rock rolling down a hillside at 1 m/s.
a 100 kg rock rolling down a hillside at 100 m/s.
Answer:
Solid particles have the least amount of energy, and gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles. A change in phase may occur when the energy of the particles is changed.
Explanation:
Solid particles have the least amount of energy, and gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles. A change in phase may occur when the energy of the particles is changed.
Answer:
BOO!
Explanation:
Can someone help me
Answer:
Is it D?
Explanation:
please help on this, if i don’t turn this in i’m getting my harry styles tickets taken away
Answer:
is that chromium on that computer ?
Explanation:
Answer:
noooo not harry
Explanation:
14.
How many grams of copper are in 4.6 moles of copper?
Answer:
292.1 kg = 292 100 g
Explanation:
n = m/Mm
Mm(Cu) = 63.5
m = n * Mm
m = 4.6 * 63.5
m = 292.1 kg
(5.50 x 10^6) x (2.16x 10^-2)
Answer:1.188
⋅
10
5
1.188 Times 10 to the fifth power
Explanation:
PLEASE HELP WILL GIVE BRAINLEST
Which relationship explains how the water can boil at room temperature?
A Lower air pressure results in a lower boiling point
B. Lower air temperature results in a lower boiling point
C. Lower air pressure results in a higher boiling point
D. Lower at temperature results in a higher boiling point
Answer:
Option A.
Lower air pressure results in a lower boiling point
Explanation:
This is because in an open system, the lower the pressure the lesser the energy that will be required for boiling point. The is little or no collision of air molecules with the surface of the liquid
But if there is increase in pressure, more energy will be required to get to boiling point because there will be strong collision between air molecules and surface of the liquid.
answewr this question for 40 point
Answer:
stamen contains pollen
Explanation:
Answer:
Stamen
Explanation:
What often occurs at a transform plate boundary (like the San Andreas Fault in California)? *
Earthquakes
Trenches
Rift Canyons
Volcanoes
PLS PLS PLS HELP ME I WILL MARK Y OUT BRAINLYEST JUST PLS HELP ME :((
Which statement describes compounds?
A) Compounds are made of one type of atom.
B) Compounds cannot be represented by models.
C) Compounds are represented by chemical formulas.
D)Compounds cannot be broken down into simpler forms.
Answer:
C
Explanation:
please help me with this.
Justifica cuál de las tres medidas siguientes es mejor. a) Una masa de 3 kg con un error absoluto de 1 g. b) Una masa de 4 g con un error absoluto de 1 mg. c) Una masa de 95 kg con un error absoluto de 1 kg.
Answer:
La mejor medida, con el error porcentual más pequeño de 0.025% es una masa de 4 g con un error absoluto de 1 mg
Explanation:
Tenemos el error porcentual dado como sigue;
[tex]El \ porcentaje \ error =\dfrac{\left | v_A - v_e \right |}{v_E} \times 100[/tex]
Dónde;
[tex]\left | v_A - v_e \right | = Error \, absoluto[/tex]
[tex]v_e[/tex] = El valor esperado
La mejor medida tiene el menor porcentaje de error;
a) Para una masa de 3 kg con un error absoluto de 1 g, tenemos;
El valor esperado, [tex]v_e[/tex] = 3 kg
Error absoluto = [tex]\left | v_A - v_e \right |[/tex] = 1 g = 0.001 kg
Que da el error porcentual = 0.001/3 × 100 = 0.0[tex]\bar 3[/tex]%
b) Una masa de 4 g con un error absoluto de 1 mg = 0,001 g
El valor esperado, [tex]v_e[/tex] = 4 g
Error absoluto= [tex]\left | v_A - v_e \right |[/tex] = 1 mg g = 0.001 g
El porcentaje de error = 0.001/4 × 100 = 0.025%
c) La masa medida dada = 95 kg
El error absoluto = 1 kg
El valor esperado, [tex]v_e[/tex] = 95 kg
Error absoluto = [tex]\left | v_A - v_e \right |[/tex] = 1 kg
El porcentaje de error = 1/95 × 100 ≈ 1.053%.
Por lo tanto, la mejor medida, con el menor porcentaje de error de 0.025% es una masa de 4 g con un error absoluto de 1 mg.
Which of the following could potentially have a mutation? (Check all that may apply.)
Fungi
Animals
Bacteria
Viruses
Plants
Answer:
all of them
Explanation:
