The half-life of this radioisotope : 12 hr
Further explanationThe atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.
Usually radioactive elements have an unstable atomic nucleus.
General formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]
t = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
t=48 hr
[tex]\tt \dfrac{Nt}{No}=\dfrac{1}{16}[/tex]
The half-life :
[tex]\tt \dfrac{1}{16}=\dfrac{1}{2}^{(48/t\frac{1}{2} )}\\\\(\dfrac{1}{2})^4=(\dfrac{1}{2})^{48/t\frac{1}{2}}\\\\4=48/t\frac{1}{2}\\\\t\frac{1}{2}=12~hr[/tex]
100 points?
1. Diamonds, coal, and pencil lead are all made of the same element. What is that element?
2. What is the chemical symbol for this element?
3. Is this element primarily found in the solid earth, Earth’s living matter, Earth’s oceans, or the atmosphere?
4. Since the same elements make up coal and diamonds, what causes them to appear different?
5. Under normal conditions, what color do we expect diamonds to be?
6. Why can diamonds different colors?
Answer:
1. Carbon
2. C
3. Oceans
4. This is the hardest question so far :(
5. Most of every diamonds are colorless and clear, but are in a category of brown or pale yellow color that is called the normal color range.
6. has to be refraction.
Pls mark me brainly!
Which sample of matter is a pure substance?
Answer:
salt, sugar, ect.
Explanation:
A pure substance is a material that has a constant composition. It has consistent properties throughout the sample. A pure substance helps in a chemical reaction to form predictable products. In chemistry, a pure substance consists of only one type of atom , molecule, or compound.
Arsenic has one stable isotope:75/33 As.
How many neutrons and protons are in a stable arsenic atom?
A. 33 neutrons and 42 protons B. 33 neutrons and 75 protons
C. 42 neutrons and 33 protons
D. 75 neutrons and 33 protons
What is force? Why?
Which property do acids and bases share
Answer:
: A property that is shared by bases and acids is the ability to conduct electricity when dissolved in water. Some ways bases and acids are different is that acids taste sour whereas bases taste bitter. Also, acids but not bases react with metals.
Explanation: Trust me on this
How many moles of hydrochloric acid does
1.505x10^24 atoms of hydrochloric acid make?
2.499 mol HCl
hope this helps
Which statements correctly describe chemical reactions? Select all that apply.
Answer:
The statements that correctly describe chemical reactions are
A. If the reactants include 5 atoms of Fe, then the products must include 5 atoms of Fe.
C. If the reactants include an aluminum atom, then the products must include an aluminum atom.
E. If there are a total of 15 atoms in the reactants, there must be a total of 15 atoms in the product.
Explanation:
In a chemical reaction, reactants are the elements or compounds that react to give a particular product(s). The reactants are the substances that start the chemical reaction and they are found at the left hand side of the chemical equation. While the products are found at the right hand side of the chemical equation and they are seen at the end of the reaction.
In chemical reaction, the number of atoms that starts the reaction remains the same. That is the same number of atoms is seen in the products. This follows the law of conservation of matter - which postulates that matter cannot be created or destroyed.
But in a chemical reaction, number of molecules are not conserved.
The statements that correctly describe chemical reactions are:
A. If the reactants include 5 atoms of Fe, then the products must include 5 atoms of Fe.
C. If the reactants include an aluminum atom, then the products must include an aluminum atom.
E. If there are a total of 15 atoms in the reactants, there must be a total of 15 atoms in the product.
Chemical Reaction:A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. If a physical change occurs, the physical properties of a substance will change, but its chemical identity will remain the same.
Thus, the statements that are true for a chemical reactions are A, C and E.
Find more information about Chemical reaction here: brainly.com/question/26018275
What is the acceleration of a shopping cart that is 16 kg moving with a force of 2N?
30 points!!!!!!!!!!!!!!!
Answer:
According to Newton's second law of motion, the acceleration of an object equals the net force acting on it divided by its mass, or a = F m . This equation for acceleration can be used to calculate the acceleration of an object when its mass and the net force acting on it are known.
Explanation:
hope it help
Answer:
According to Newton's second law of motion, the acceleration of an object equals the net force acting on it divided by its mass, or a = F m . This equation for acceleration can be used to calculate the acceleration of an object when its mass and the net force acting on it are known
Explanation:
A real gas behaves most like an ideal gas at?
The correct name for the molecule IgBr7 is:
Answer:
(iodine?) heptabromide
Explanation:
Not sure what element Ig is but use that name and then heptabromide.
Help plz:))) I’ll mark u brainliest
Element in group 1 that is NOT classified as a metal.
Answer:
i think it is hydrogen
Explanation:
Answer:
They are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
____ are atoms or molecules with an electrical
charge, either positive or negative. Whether a liquid is
an acid or a base depends on these. We classify acids
and base on the ____. A liquid on this scale with
a pH of 3 is a/an ____, while a liquid with a pH of
9 is a/an ____ When an acid and a base interact
with one another the liquid can become ___
and it will have a pH of 7.
The answer to fill in the blank are: Acidic, Basic, pH Scale, Neutral, Ion
Answer:
ions
ph scale
neutral
basic
acidic
Explanation:
hopefully I got it right u welcome :)
PLS HELP ILL MAKE BRAINLIEST 30 POINTS!!
Which parts of the muscular and skeletal system work together to move muscles and bones? nerves esophagus and intestine arteries and vessels tendons and ligaments
Answer:
tendons and ligaments
which of the following types of stars would be hottest in temperature A main sequence B whitedwarf C red giant D Red supergiant star
Answer:
it's either b or d
Explanation:
Which describes reproducibility
How does a changing environment affect plant and animals threat live there
Explanation:
Changing the environment takes away habitats from animals and some nutrients plants need
Hope this helps :>
Is a compound a substance made up of only 1 kind of element
Answer/Explanation:
No compounds must be made up of two or more elements. otherwise it wouldn't be a compound. There must be some type of combination or it isn't a compound.
Which is more reactive, calcium or potassium ?
Answer:
the answer is potassium
Explanation:
Potassium has only one valence electron. ... Whereas, calcium has two valence electrons, so it requires more energy for the removal of a valence electron. Due to this potassium is more reactive than calcium.
Bye Have A Great Day! =)How many protons are present in one iron(III)
ion?
Answer:
26 protons
A neutral iron atom has 26 protons and 26 electrons. In order to form a 3+ ion, it must lose three electrons. The Fe atom loses two 4s electrons and one 3d electron.
Explanation:
Energy Transfer is the Blank from one object to another object.
Answer:
Process
Explanation:
Energy transfer is the process from one object to another object
Energy transfer is the transfer of energy from one object to another object.
Energy can be defined as the ability (capacity) to do work. Hence, the only standard unit of measurement of energy is Joules (J).
Generally, there are different forms of energy and these include;
Heat (thermal) energy.Light energy.Sound energy.Wind energy.Energy transfer is a process which refers to the transfer of energy from an object or physical body to another.
According to the Law of Conservation of Energy, energy can neither be created nor destroyed but it can only be converted (transformed) from one form to another such as kinetic energy to potential energy.
For example, a jug of hot tea has heat (thermal) energy, which is added to the particles in a cold powdered milk to make the coffee hotter.
Read more: https://brainly.com/question/23153766
Notes: Thermal Energy
Instructions
Read the webpage on Thermal Energy
Watch the video at the end of the notes
Upload your answers to the Review Questions at the end of the page in one of the following formats:
a PDF of your typed answers
a photo of your handwritten answers
Answer:
There is nothing attached..
Explanation:
Answer:
there is nothinig to add
Explanation:
Through what process do humans and animals get the energy they need?
A. photosynthesis
B. cellular respiration
C. heat energy
D. hydrolysis
Answer:
C heat energy
Explanation:
Which orbital notation represents an atom of beryllium in
the ground state?
Answer: Beryllium is the fourth element with a total of 4 electrons. In writing the electron configuration for beryllium the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the remaining 2 electrons for Be go in the 2s orbital. Therefore the Be electron configuration will be 1s22s2.
Explanation:
Orbital notation represents an atom of beryllium in the ground state is [tex]1s^22s^2[/tex].
Beryllium atom:Beryllium is the fourth element with a total of 4 electrons. Beryllium atoms have 4 electrons and the shell structure is 2.2. The ground state electron configuration of ground state gaseous neutral beryllium is [tex][He] 2s^2[/tex]. The ground state of an electron, the energy level it normally occupies, is the state of lowest energy for that electron. Beyond that energy, the electron is no longer bound to the nucleus of the atom and it is considered to be ionized. Electron configuration for beryllium the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the remaining 2 electrons for Be go in the 2s orbital.
Therefore, the Be electron configuration will be [tex]1s^22s^2[/tex].
Find more information about Beryllium atom here:
brainly.com/question/5041761
Please help with my chemistry homework! : Fuel burns in a car engine. Describe how oxides of nitrogen are produced in a car engine. I stated: -very high temperatures in the car engine create a reaction of oxygen and nitrogen. But I'm unsure if this is correct and would award me the full 2 marks?
Answer:
Your statement is right.
Explanation:
When fuels are burned in vehicle engines, high temperatures are produced. At this high temperature, nitrogen and oxygen from the air combine with each other to produce nitrogen monoxide (NO). When this nitrogen monoxide is released in the air from vehicle exhaust systems, it combines with oxygen present in the air to form nitrogen dioxide (NO2).
What is the molar mass of cryolite
Answer:
wt= 3(23)+27+6(18.9)
=69+27+113.94
Explanation:
=209.94 grams
Answer:
209.9 g mol
Explanation:
Can an object of 8.6g/cm3 Float
Answer:
yes
Explanation:
A truck traveled at a constant speed for 6 hours. Then, it
decreased its speed by 13 mph for the remaining 228 miles. If
the total distance was 876 miles, how long did it take to travel
the remaining 228 miles?
h
Answer:
2.4 hrs
Explanation:
The constant speed of the truck for 6 hrs can be calculated by: speed=distance/time. Speed =(876-228)/6=648/6=108m/s. So the decreased speed = (108-13)=95m/h. Now, speed =distance /time We get 95m/h = 228/t. t=228/95 hrs = 2.4 hrs PLEASE MARK ME THE BRAINLIEST!!
Answer:
17.5 h
Explanation:
228/13=17.5384615385
17.5
I hope this helped! :)
Just need help with these two questions
Genetic diversity is important because the more genes are in a population , the more likely that one of those genes will prove ______ in the face of threats such as climate change or a new disease.
Answer:
higher endurance & adaptability
Explanation:
Genetic Diversity is diversity within species, community.
Genetic Diversity is important as higher genetic variations in population imply that - some or all of their genes have will prove to have higher endurance & adaptability in case of environment aspect (like climate) change or any adversity (new disease).
Which statement about the earth’s atmosphere is true?
A recent decrease in carbon dioxide levels will increase plant growth on Earth.
In the past few decades, carbon dioxide levels have been rising.
In the past few decades, carbon dioxide levels have been falling.
A recent increase in carbon dioxide levels can contribute to a long-term cooling of Earth’s climate.
Answer: B - In the past few decades, Carbon dioxide levels has been rising because Rising levels of Carbon dioxide has become an immediate concern for the Environmentalists. This is because carbon dioxide is a greenhouse gas and risen levels of greenhouse gases can lead to unusual warming up of the Earth's Atmosphere.
Quote: I HOPE THAT HELPED!
Answer:
I guess it's ***B***
Explanation: :) Your welcome!