1. A 50 gram sample of a radioisotope decays to 12.5 grams in 14.4 seconds. What is
the half-life of this isotope?
Answer:
Half life = 7.2 seconds
Explanation:
[tex]from \: decay \: equation \\ 2.303 log( \frac{n.}{nt} ) = kt \\ 2.303 log( \frac{50}{12.5} ) = k \times 14.4 \\ k = \frac{2.303 log( \frac{50}{12.5} )}{14.4} \\ k = 0.096288 {s}^{ - 1} \\ since \: half \: life = \frac{ ln(2) }{k} \\ half \: life = \frac{ ln(2) }{0.096288} \\ half \: life = 7.2 \: seconds[/tex]
Can all molecules become all states of matter?
Answer:
Yep i think so.
Explanation:
Pretty sure molecules examples of things in matter...you might wanna double check tho
Tanisha is mixing powdered orange drink mix into a cup. She wants to make sure the orange taste is strong, so she adds a lot of powdered mix. As she is mixing, she notices that the powdered mix starts to float around in the water in clumps, and some settles on the bottom of the cup. Predict why this would happen.
A.
The powder is too old to dissolve in the water.
B.
No more powder will dissolve in the water.
C.
The powder needs to be shaken to fully dissolve.
D.
The powder does not fully dissolve because the water is too warm.
Answer:
B. No more powder will dissolve in the water.
Explanation:
If a lot of powder is added to the water, then a fully saturated solution would be created. This means that no matter how much more powder is added or how strong the mix is shaken, no more powder will disolve. The powder will instead remain in solid form in the solution.
Answer:
Heat up the water first because it increases solubility of the powdered mix.
Explanation:
Took the test on Edg. Hope this helps!! :)
SOMEONE PLEASE HELP QUICKLY
determine the number of charged particles in nucleus of calcium atom then deduce the number of electrons
NUCLEAR CHARGE (20+)
ATOMIC MASS (40 amu)
given the relative charge of a proton =1+\ m1nucleon=1amu
Answer:
detail is given below.
Explanation:
The charged particles of nucleus are protons while neutrons are neutral having no charge.
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons.
one proton contribute 1 amu to the total weight. There are 20 protons and 20 neutrons in Ca thus its atomic mass is 40 amu.
While the atomic number is 20.
Aides in the burning of materials. Needed for humans to breathe.
Answer:
Oxygen.
Explanation:
Oxygen is a chemical element that aides in the burning of materials and it is needed for humans to breathe.
Cellular respiration can be defined as a series of metabolic reactions that typically occur in cells so as to produce energy in the form of adenosine triphosphate (ATP). During cellular respiration, high energy intermediates are created that can then be oxidized to make adenosine triphosphate (ATP). Therefore, the intermediary products are produced at the glycolysis and citric acid cycle stage through the breathing of oxygen used to obtain energy from the food ingested.
Hence, all cells in living organisms require oxygen and glucose to release energy.
equivalent mass of AL2O3
Answer:
[tex]Mass = 102g[/tex]
Explanation:
Given
Compound: [tex]Al_2O_3[/tex]
Required
Determine the equivalent mass
In the above compound, we have: 2 Al and 3 (O)
The atomic mass of Aluminium is:
[tex]Al = 27[/tex]
The atomic mass of Oxygen is:
[tex](O) = 16[/tex]
So, the equivalent mass is:
[tex]Mass = 2 * 27 + 3 * 16[/tex]
[tex]Mass = 54 + 48[/tex]
[tex]Mass = 102g[/tex]
how do you separate immiscible and miscible liquid
Answer:
A mixture of immiscible liquids is separated by using an apparatus called separating funnel. (i) Separation by fractional distillation : Fractional distillation is the process of separating two (or more) miscible liquids by distillation, the distillate being collected in fractions boiling at different temperatures.
Explanation:
hope this sorta helps you -.-
In this reaction, how does the rate of forward reaction vary with the concentration of the product?
2H2S(g) ⇌ 2H2(g) + S2(g)
It increases with an increase in the concentration of S2(g).
It decreases with a decrease in the concentration of H2(g).
It increases with a decrease in the concentration of H2(g).
It decreases with an increase in the concentration of S2(g).
It decreases with increase in the concentration of H2(g).
Answer:
c d e
Explanation:
Answer:
C D E
Explanation:
#platogang
does the state of matter change in sugar solution
Answer:
yes
Explanation:
the sugar was a solid but after being dissolved in a liquid it changed state
wich type of matter is always made up of only one kind of atom
Answer:
what is this for?
Explanation:
Answer:
Elements
Explanation:
"Elements are substances, forms of matter and gasses that are made up of only one type of atom."
Panico. (2012, September). The Atomic Model and Matter. Retrieved December 15, 2020, from https://odysseyk12.org/hs/teachers/panico/pdf/atoms/atoms.html
The percentage by volume of oxygen in clean and dry air is approximately
Answer:
[tex]\huge\bf\underline{\underline{\pink{A}\orange{N}\red{S}\green{W}\purple{E}\blue{R}}}[/tex]
ONLY 20.95% IN THE AIR
:)
▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃
What does the 16 mean in the isotopes carbon 16
Answer:
Carbon 16
Explanation:
Isotope of nitrogen
Would any Chemistry braniacs be kind enough to help explain how to work these out? Any help is appreciated, thanks
Answer:
NO.3) Mass of Al2O3 formed = 229.5g
if the pH of a substance is 3.2, is it an acid, base, or neutral?
Answer:
It's acidic.
Explanation:
A student spends 4.5 hours studying for a test. How much time is this equivalent to in seconds?
Select one:
a. 2,700 seconds
b. 16,200 seconds
c. 270 seconds
d. 6,480 seconds
Answer:
B. 16,200
Explanation:
1) Reduce.
4.5 hours can be translated to minutes. We know there are 60 minutes in an hour.
4.5 * 60 = 270 minutes
2) Reduce further
270 minutes can then be translated to seconds using the same equation
270 * 60 = 16,200
Plants don't grow as well when ____ has been lost.
a.
clay
c.
parent rock
b.
topsoil
d.
slope
Answer
the answer is b
explanation
Answer:
b. topsoil
Explanation:
I just took the test
The function of the mitochondria is to obtain and convert energy. What body system has a similar function?
Answer:
The function of the mitochondria is to obtain and convert energy. What body system has a similar function?
Explanation:
Chloroplasts are very similar to mitochondria, but are found only in the cells of plants and some algae. Like mitochondria, chloroplasts produce food for their cells. Chloroplasts help turn sunlight into food that can be used by the cell, a process known as photosynthesis
You discovered a new compound with the following name: Feline (II) Canide. Based on the information below, what would be the correct formula for this compound?
*Canine is a halogen
*Feline has the following symbol: Fi
*Canine has the following symbol: Ci
*Answer choices*
*Fi2Ci3
*FiCi2
*CiFi
*Fi2Ci
Answer:
FiCi2
Explanation:
In relation of Iron(ii) chloride, FeCl2
According to Le Chatelier’s principle, which statement is true?
The equilibrium constant is unchanged by temperature changes.
The equilibrium constant changes with a change in temperature.
The equilibrium constant increases with the concentration of reactants.
The equilibrium constant decreases with the concentration of products.
As per Le Cha-tel-ier’s principle, the true statement should be option b. The equilibrium constant changes with a change in temperature.
What is Le Cha-tel-ier’s principle?It defined that if there is any changes in the temperature, pressure, volume, or concentration of a system so it should be leads into the opposing changes in the system for accomplishing a new equilibrium state.
Hence, we can conclude that As per Le Cha-tel-ier’s principle, the true statement should be option b. The equilibrium constant changes with a change in temperature.
Learn more about equilibrium here: https://brainly.com/question/24207087
Answer:
b
Explanation:
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:
soap making ingredients list (not harmful chemicals)
20 oz. coconut oil
10 oz. olive oil
9 oz. distilled water
essential oils
colorants (optional)
dried herbs or flowers (optional)
soap base accordingly
Is ceramic a good insulator
Balance the combustion reaction between octane and oxygen. 2C8H18 + O2 → CO2 + H2O
Answer: 2C8H18 + 25O2 -> 16CO2 + 18H2O
Explanation:
96.5 grams of gold has a volume of 5 cm, what is the density of gold?
Answer:
9.3
Explanation:
The first thing to do to solving this problem is putting mass over volume, 96.5g / 5cm^3. When you divide, you should get 1. Hope I helped.
How long does it take for 87.5 % of each isotope(Krypton-73, Krypton-74, Krypton-76, and Krypton-81) to decay?
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!!
What explanation can you give to explain the cartoon below. You need to use 5 of the terms listed below correctly in your explanation.
*Ionic Bond
*Ions
*Cation
*Anion
*Ionic Compound
*Monatomic Ion
*Electrostatic Forces
*Salts
*Metals
*Nonmetals
*Polyatomic Ion
Answer:
*Ions
*Cation
*Anion
*Monoatomic ion
*Electrostatic forces
Na3(PO4) + HCl yields NaCl + H3(PO4)
Chemical Equation Balancer
Weather can change from day to day, but does not
A. the Earth
B. climate
C. ali
D. the atmosphere
ANSWER climate
EXPLANATION climate is change in the weather pattern of a particular area for a longer period of time usually for a month or even year
Answer:
The answer is B: Climate
Explanation:
Just took the test
Which of the following is a possible compound formed from Ca2+ and NO3-1?
F Ca2NO3
G Ca(NO3)2
H Ca3NO2
J CaNO
Answer:
Ca(NO3)2
.................
Ca(NO3)2 is a possible compound formed from Ca²+ and NO3-¹.
Ions, which are charged atoms of elements come together to form ionic compounds. A positively charged ion called cation reacts with a negatively charged ion called anion to form a neutral ionic compound i.e. compound with a charge of 0. In this question, cation Ca²+ reacts with anion NO3-. The ionic compound formed must have a net charge of 0. This can only happen if 2 moles of NO3- and 1 mole of Ca²+ is present in the compound. The resulting ionic compound can be chemically represented as Ca(NO3)2. Therefore, Ca(NO3)2 is a possible compound formed from Ca²+ and NO3-¹.Learn more at: https://brainly.com/question/11148793?referrer=searchResults