We can convert strontium-82 to rubidium-82 by positron emission.
The three main fundamental subatomic particles in an atom are;
ProtonsNeutronsElectronsIn a neutral atom, the number of protons is always equal to the number of electrons.
In strontium-82, there are 44 neutrons, 38 electrons and 38 protons. In rubidium-82, there are 45 neutrons, 37 electrons and 37 protons. We can convert strontium-82 to rubidium-82 by positron emission.
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determine the number of grams in 4.87 x 10^22 atoms of barium hydroxide Ba(OH)2'
(fence post model)
Answer:
hola espero que mi respuesta ayude
Explanation:
The concentration of hydroxide ion (-OH) in 1.37 x10^-5 m solution of Ba(OH)2 is calculated as follows
write the equation for dissociation of Ba(OH)2
Ba(OH)2 = Ba^2+(aq) + 2OH^-(aq)
by use of mole ratio between Ba(OH)2 to OH^- which is 1:2 the concentration of OH^- = 2x ( 1.37 x10^-5) = 2.74 x10^-5 M
Particulate Electrical Forces Unit Test for Connexus, Chemistry A
I've already finished the questions, but im stuck on the written parts 16-18, can anyone give a hand? :(
I’m sorry no one helped you with those questions. But could you please be a doll and give me the answer for the multiple-choice questions 1-15. Pleaseee I’m so desperate.?
What is the purpose of the chemical ammonia (NH3) in hair dyes?
Answer: Ammonia, an alkaline chemical, is used to raise the pH level (it's levels of acidity) of our hair during the colouring process. This then lifts the cuticles of the hair fibre and allows the colour to be deposited onto the cortex (the inner part of the hair protected by the cuticles). In hair coloring products, ammonium hydroxide is used to support the lightening action of hydrogen peroxide and to prepare hair to accept color pigments. Alkaline properties of ammonia raise the cuticle and allow peroxide and dye molecules to penetrate the hair shaft. (creds to the internet)
Explanation: Hope this helps! :D
Explain two ways to restore the Florida Panther population.
Answer:
Explanation: encourage your legislators to support land acquisition programs such as Florida Forever and the Rural and Family Lands Protection Program.
What is the formula for the binary ionic compound formed between
zinc and nitrogen.
Answer: Zinc nitride (Zn3N2) is an inorganic compound of zinc and nitrogen, usually obtained as (blue)grey crystals. It is a semiconductor. In pure form, it has the anti-bixbyite structure.
Chemical formula: Zn3N2
Space group: Ia-3, No. 206
EC Number: 215-207-3
Appearance: blue-gray cubic crystals
Explanation:
Solve the following problems and show the complete solutions.
1. How many moles of Carbon Dioxide is equivalent to 1.5X1023 atoms of CO2?
2. If you have 5grams of pure Aluminum, (Al), how many atoms does it have? (Al=27)\.
3. If 3 moles Sodium (Na) reacts with exact Chlorine gas (Cl2) in this reaction: 2Na + Cl2 ---> 2NaCl How many mole of Sodium Chloride (NaCl) will be produced?
4. Give the mass percent composition of Potassium, Sulfur and Oxygen in a molecule of Potassium Sulfate: K2SO4.(atomic mass: K=39, S=32).
5. If 162g of Aluminum reacts with 144g of Oxygen gas to form Aluminum oxide, what is the mass percentage of Aluminum?
6. A sample was analyzed and found to contain 40% Carbon. 6.71% Hydrogen and 53.29% Oxygen. If the molecular mass of this compound is 18.16g/mol, what is the empirical and molecular formula of this compound?
The molecular formula of the compound is C6H12O6.
1) We know that;
1 mole of CO2 contains 6.02 X 10^23 atoms
x moles of CO2 contains 1.5 X 10^23 atoms
x = 1 mole X 1.5 X 10^23 atoms /6.02 X 10^23 atoms
x = 0.25 moles of CO2
2) 1 mole of pure Al has 27 g
x moles of Al has 5 g
x = 1 mole × 5 g/ 27 g
x = 0.19 moles
If 1 mole of Al contains 6.02 X 10^23 atoms
0.19 moles of Al contains 0.19 moles × 6.02 X 10^23 atoms /1 mole
= 1.14 X 10^23 atoms
3) From 2Na + Cl2 ---> 2NaCl;
2 moles of Na produces 2 moles of NaCl hence 3 moles of Na will also produce 3 moles of NaCl.
4) The molar mass of K2SO4 is obtained from;
2(39) + 32 + 4(16) = 78 + 32 + 64 = 174 g/mol
Now;
Percentage by mass of K = 2(39)/ 174 × 100/1 = 44.8%
Percentage by mass of S = 32/174 × 100/1 = 18.4%
Percentage by mass of O = 4(16)/174 × 100/1 = 36.8%
5) The reaction equation is;
4Al(s) + 3O2(g) ----> 2Al2O3
Total mass present = 162g + 144g = 306 g
Mass percent of Al = 162g/ 306 g × 100/1 =52.9%
6)
C - 40/12 H - 6.71/1 O - 53.29/16
C - 3.33 H - 6.71 O - 3.33
Dividing through by the lowest ratio
C- 3.33/3.33 H - 6.71/3.33 O - 3.33/3.33
C - 1 H - 2 O - 1
The empirical formula is CH2O
Now;
[12 + 2(1) + 16] n = 180.16
30n = 180.16
n = 180.16/30
n = 6
The molecular formula is C6H12O6.
Learn more about molecular formula: https://brainly.com/question/11588623
Which statement below describes the behavior of a Molecules when a substance changes from a gas to liquid
Answer:
As a substance changes from a solid to a liquid to a gas, its molecules first the molecules are moving fast enough, they are able to "escape." They leave the surface of the liquid as gas molecules. Evaporation is not the only process that can change a substance from a liquid to a gas. The same change can occur through boiling.
Explanation:
hopfully this helps!
What does it mean when the
frequency of a wave increases?
A. the amplitude increases
B. the amplitude decreases
C the wavelength becomes shorter
D. the wavelength becomes longer
Answer:
The answer is C
Can you put a brainliest for me
Explanation:
Answer:
the wavelength becomes shorter
Explanation:
frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
how to tell if something is a strong or weak acid or base
Answer:
It basically depends upon the pH value of that acid or Base. That's how you can determine whether the substance is a strong or weak acid/base. We have a pH scale ranging from 1 to 14, where 7 is the neutral point. Any substance having a pH of 7 means it is neither an acid nor a Base, but neutral in nature, such as water([tex]H_{2}O[/tex]). Now, if the pH is less than 7, the substance is an acid, similarly if the pH is more than 7, it is a base. As the pH DECREASES, the substance becomes more acidic, on the other hand as the pH INCREASES, the substance becomes more basic. This way you can compare between pH values of two substances and tell which one is stronger or weaker.
For Acids:
If a substance's pH is between 1 and 7 it is an acid. If it is more towards 1, it's a strong acid and if it's more towards 7 it is a weak acid.
For Bases:
If a substance's pH is between 7 and 14 it is a base. If it is more towards 14, it's a strong base and if it's more towards 7 it is a weak base.
Hope that helps...
I need to right a journal entry for school but i don't know what to put Write a journal entry from the perspective of a particle of light,
called a photon. Your story should follow the photon as it
travels from a star in the Milky Way that is 25 light years away
from Earth, all the way to the eye of a young person gazing up
at the night sky through their bedroom window. Compose your
entry in complete sentences.
it is for my 5 grad sicenc
Answer:
here you go
Explanation:
someone help me on this but i still got a hundred
Most weak bases are:
a. Anions of weak acids
b. Anions of strong acids
C.Cations of weak acids
d. Both A and C
Answer:
The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid.
Explanation:
The stronger the acid, the weaker its conjugate base and vice versa A very weak acid has a very strong conjugate base.
explain why almunium is often used for long distance over head electric cables (high voltage)
Answer:
because it does not cost much and can be found easily. due to their low resistance and excellent conductivity.
Explanation:
How are elements arranged on the periodic table?
Question 10 options:
boiling point
atomic mass (# of protons and neutrons)
density
atomic number (# of proton
Answer: They are arranged by atomic number.
5. What is a chemical equation? What are the essentials of a chemical equation? What information is conveyed by a chemical equation? What are its limitations and how are they removed?
Answer:
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formula. (i) It must refer to an actual chemical reaction. (ii) It should be molecular. For example, H, O, N should be written as H2, O2, N2. (iii) It should be balanced and conform to the law of conservation of matter.A chemical equation conveys both qualitative and quantitative information. Qualitatively, a chemical equation tells the names of the various reactants and the products.
which two groups of the periodic table contain the most chemically reactive metals?
Answer:
group 3 and 12 alkali and alkaline earth metal
The process in which the nucleus of an atom splits into two lighter atoms, releasing a large amount of energy, is nuclear ______ Fusion Fission Radiation Energy.
Answer:
B. Fission
Explanation:
On edge
7. What is the mass of 389 cm°of propane if the density is 19.3 g/cm?
We are given that–
Volume of Propane is = 389 cm³Density of Propane is = 19.3 g/cm³[tex]\qquad[/tex]________________________
As we know –
[tex]\qquad[/tex][tex] \pink{\bf\longrightarrow {Mass = Volume \times Density } }[/tex]
[tex]\qquad[/tex][tex] \bf\longrightarrow Mass_{(Propane)} = 389 \times 19.3 [/tex]
[tex]\qquad[/tex][tex] \bf\longrightarrow Mass_{(Propane)} = 7507.7 \: g[/tex]
Hence, Mass of Propane is 7507.7 g.[tex]\qquad[/tex]______________________
Mass of a substance is the amount of the constituting particles per unit volume. The mass of the [tex]\bold { 389\ cm^3}[/tex] of propane is 7.507 kg.
Mass of a substance is the amount of the constituting particles per unit volume. It is measured in kilograms (kg).
The formula for mass,
M = v x d
Where,
M - mass
v - volume = [tex]\bold { 389\ cm^3}[/tex]
d - density = 19.3 g/cm
Put the values in the formula,
M = [tex]\bold { 389\ cm^3}[/tex] x 19.3 g/cm
M = 7507.7 g
M = 7.507 kg
Therefore, the mass of the [tex]\bold { 389\ cm^3}[/tex] of propane is 7.507 kg.
To know more about density,
https://brainly.com/question/952755
Help with this worksheet please (24pts)
Hope you could get an idea from here.
Doubt clarification - use comment section.
When potential energy is converted into kinetic energy, some of that energy is always in the form of:
А.
light energy
B.
chemical energy
с
nuclear energy
D
heat energy
Determine the amplitude
or period as requested.
Period of y = 4sin 1/3x
a. 4
b. Pi/4
c. 4pi/3
d. 6pi
Answer:I found out that it is c
Explanation:Find an answer to your question Determine the amplitude or period as requested. Period of y = 4sin 1/3x a. 4 b. Pi/4 c. 4pi/3 d. 6pi.
HELP ME PLZZZ
SMNSNSNS
D
D
D
D
D
D
D
D
D
D
Answer:
#1 is C, #2 is D, #3 is A
Explanation:
what should you do if your bunsen burner does not light after a few tries with the striker?
Which of the following compounds will have the highest boiling point?
MgCl2
CO2
C12H22O12
,
H2O
Chemical reactions project modeling the conservation of mass pls help just need answer
The law of conservation of mass states that
In any chemical reaction mass is neither created nor destroyed rather it remains conserved
Mass of reactants=Mass of productsLook the chemical reaction below
[tex]\\ \sf\longmapsto 2H_2+O_2=2H_2O[/tex]
Count the mass on both sides and simplify
It will be 18g and ratio remains oneIf you were an astrobiologist, what would you do to search for life?
Astrobiologist means someone who studies the possibilities of life beyond earth. what would YOU do to search for life? They're asking for your opinion :)
30g of glucose and 20 g common salt is dissolved in 500 mL of water to make solution. Calculate the concentration of a (a) glucose and (b) common salt in terms of mass by mass percentage of the solution. (Density of water = 1 g/mL)
Answer:
The answer of a is 5.45% and b is 3.64%
Explanation:
Density of water = 1 g/mL
∴ Mass of water (solvent) = 500 g
Mass of solute (glucose) = 30 g
Mass of solute (common salt) = 20g
Mass of solution = (30 + 20 + 500) g = 550 g
a.)Mass percentage of solution for glucose
= Mass of solute (gucose)/Mass of solution × 100
= 30/550 x 100
= 5.45 %
b.)Mass percentage of solution for common salt
= Mass of solute (common salt)/Mass of solution × 100
= 20/550 × 100
= 3.64 %
Thus, The answer of a is 5.45% and b is 3.64%
-TheUnknownScientist 72
Answer:
5.45%
and
3.64%
hope it's helpful
Complex organisms require a large number of cells that
A.Complex organisms require a large number of cells that
Which of these would describe a dish that contains bits of chocolate and nuts you can see?
homogeneous mixture
compound
heterogeneous mixture
none of the above
Answer:
mezcla homogénea
Answer:
heterogeneous mixture
Explanation:
you can split the mixture easily with you hands while homogeneous mixtures is dissolved
This is my class group-work with my friends but we are stuck on this question.
Explanation:
It has to be C, because Carbon can bond with four other atoms and is like a four-hole wheel.
(Sorry if my elplanation was kinds choppy Oof, helpfully it makes sense?)
What is meant by collision theory?
Answer:
The collision theory states that a chemical reaction can only occur between particles when they collide (hit each other).
hope it helps~