How much cesium (half-life = 2 years) would remain from a 10 g sample after
4 years?
O A. Og
OB. 8g
O c. 59
O D. 29
SUBMIT
Answer: 2.5 grams
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) to calculate the rate constant:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{2years}=0.346years^{-1}[/tex]
b) to find amount left after 4 years
[tex]4=\frac{2.303}{0.346}\log\frac{10}{a-x}[/tex]
[tex](a-x)=2.5g[/tex]
Thus 2.5 g of cesium would remain from a 10 g sample after 4 years
How are the particles in solid ice similar to the particles in liquid water, and water vapor? How are they different?
Matter are anything that is made up of atoms. The similarity among solid ice, liquid water and water vapor is the water molecule and dissimilarities is the difference in kinetic energy.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
The similarity in the in the particles of solid ice, liquid water and water vapor is that each of these have same type of molecules that is water molecules. The dissimilarities in the in the particles of solid ice, liquid water and water vapor is that particles of of each of these have different kinetic energy.
Therefore, similarity among solid ice, liquid water and water vapor is the water molecule and disimilarity is the difference in kinetic eneergy.
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How are ironic bonds and covalent bonds different and how are they different?
What is a criterion for all products made using the process of technological design? The product must be cheaper than similar products.
The product must be available to any user who wants it.
The product must solve the problem for which it was designed.
The product must be capable of solving a variety of problems.
Answer:
C. The product must solve the problem for which it was designed.
Explanation:
Technological design is the study, development and application of technological process with the intent of designing a product to solve required problem.The process could be based on the use of a computer.
Generally, technological process and development always tend to design a problem solver product. Through this process, more new technologies are produced.
Therefore in technological process, the product must solve the problem for which it was designed.
Answer:
C) The product must solve the problem for which it was designed.
Both E. coli and Salmonella are single-celled organisms. They do not have a nucleus or other membrane-bound organelles. Based on the concept of domains, what do they have in common? They both belong to kingdom Fungi. They both belong to domain Eukarya. They both belong to domain Bacteria. They both belong to kingdom Animalia.
Answer:
domain bacteria
Explanation:
Salmonella and E. coli are same in the sense that they are both bacteria,
Answer:
B
Explanation:
The disinfectant hydrogen peroxide (H2O2)
decomposes to form water and oxygen gas.
How much O2 will result from the decomposition of 2.22 mol of hydrogen peroxide?
Answer:
1.1 mol of O2
Explanation:
First we need the balance chemical equation which is
2 H2O2 -------> 2 H2O + O2
This is important because in stoichiometry you can go from units of one thing to other by using mole ratios, here the mole ratio is 2 mol of H2O2 for one mole of O2.
[tex]2.2 mol H2O2 \frac{1mol O2}{2 mol H2O2}[/tex] = 1.1 mol of O2
When an F atom becomes an F-ion, the Fatom
gains a proton
gains an electron
loses an electron
loses a proton
When an F atom becomes an F-ion, the F atom gains an electron.
An atom is the smallest indivisible particle of an element. An atom consists of proton, electron and neutron, which are called subatomic particles. An atom becomes charged when it loses or gains an electron. The charged atom is called an ion. An atom loses electrons to become positively charged i.e. a cation while it gains electrons to become negatively charged i.e. an anion. Therefore, when an F atom becomes an F-ion, this means that the F atom gains an electron.Learn more at: https://brainly.com/question/13495616?referrer=searchResults
The Fluoride ion given has a -ve charge onto it. Thus in order to become stable Fluorine gains an electron. Thus option b is correct.
The elements in the periodic table try to attain the stable noble gas configuration in the order to become stable. The noble gas configuration has the elements to be less reactive.
When the atom loses an electron in order to become more stable, a +ve charge has been implemented onto the ion.
When the atom gains an electron to become stable, a -ve charge has been added to the ion.
The Fluoride ion given has a -ve charge onto it. Thus in order to become stable Fluorine gains an electron. Thus option b is correct.
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Which compound contains both sigma and pi bonds
name two bases which react with dillute sulfuric acid to give zinc sulfate
Answer:
Zinc Carbonate
Zinc Nitrate
Explanation:
how much volume do the gas molecules take up in an inflated balloon
Answer:
The volume of a gas is determined by the volume of the container it is in. Gases take the shape of their container and the volume of the container....
Explanation:
What happens to the volume or size of a balloon as it rises in the air?
When a balloon goes up higher in the air, its size will increase. Since there's less air in the upper atmosphere, there's less stuff pushing back on the balloon, and hence the pressure is lower, which allows the balloon to expand.
Is pressure inside a balloon greater?
The pressure inside the balloon is higher than the pressure on the outside. ... And the direction of airflow is always from higher to lower pressure. If the pressure was same then there would be no airflow and if the pressure outside was higher , air will flow from outside to the inside of the balloon.
What is the relationship between volume and pressure?
Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. If volume increases, then pressure decreases and vice versa, when temperature is held constant. Therefore, when the volume is halved, the pressure is doubled; and if the volume is doubled, the pressure is halved.
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How do forces between particles in solids compare to forces in the other
states of matter?
O A. The forces in solids are stronger than forces in liquids and gases.
O B. The forces in solids are weaker than forces in liquids and gases.
O C. The forces in solids are stronger than forces in liquids but weaker
than forces in gases.
D. The forces in solids are weaker than forces in liquids but stronger
than forces in gases.
Answer:
the answer is A
Explanation:
Forces are the intermolecular interaction between the matter. Forces present in a solid are strongest. Thus, option A is correct.
What are the phases of matter?The matter is any substance that occupies a volume. Matter can be a solid, gas, or liquid. The solid phase particles are tightly closed to each other making the force strong.
The particles of liquids that are not too compact are a little free and in gases, the particles are very free, which makes the bonding and the force the weakest.
Therefore, option A. the solids have the strongest intermolecular bonding.
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What is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons?
Answer:
39
Explanation:
Total protons + total neutrons = mass number
the particles with a negative charge are
1) protons
2)neutrons
3)electrons
Answer:
the particles with a negative charge are protons
Which factor affects gravitational potential energy but not elastic potential energy?
Answer:
spring constant. acceleration due to gravity. distance from a given position. amount of matter in the object.
Explanation:
hope this helps you :)
Answer:
spring constant
Explanation:
PLEASE HELP!!!
Design criteria are the desired features of a design. Identify at least two criteria for the design of the ammonia-making process. Explain why these criteria are important.
Answer:
Two design criteria for the design of the ammonia making process are;
1) Sustainable hydrogen production by renewable energy
2) Sustainable use of the ammonia-water thermal absorption cycle to retrieve the ammonia present in the waster water
Explanation:
Ammonia is produced from natural gas in the following process;
H₂ + RSH → RH + H₂S
H₂S + ZnO → ZnS + H₂O (Waste water)
CH₄ + H₂O → CO + 3H₂
CO + H₂O → CO₂ + H₂
Ammonia is then produced by reacting the produced hydrogen with nitrogen in the presence of a catalyst in a process known as the Haber-Bosch process as follows;
3H₂ + N₂ → 2NH₃
The
The design criteria for the design of the ammonia making process therefore as follows;
1) Sustainable use of renewable energy to produce hydrogen gas from the electrolysis of water
2) Use of the ammonia-water thermal absorption cycle to retrieve the ammonia present in the waster water.
The branch of science which deals with chemicals and their bond is called chemistry.
The two ways by which we can design ammonia making process is as follows:-
Two design criteria for the design of the ammonia making process are:-
Sustainable hydrogen production by renewable energy .The conversion of urea for the production of ammonia.
The usage of ammonia is important in these ways:-
They act as a fertilizer which helps to boost the growth of plants.They act as a poison to humans and many animals, so we have to extract it and handle it with care.Ammonia is also used as an inflammable gas.Hence, these are the design for the ammonia-making process.
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What is the total energy required to break all the bonds in 1 mol propanol,
C3H8O?
Answer:
The total energy to break all the bonds in 1 mole of 1-propanol, C₃H₈O, is 4411 kJ/mol
Explanation:
We note that propanol, C₃H₈O is also known as 1-propanol is written as follows;
CH₃CH₂CH₂OH which gives
CH₃-CH₂-CH₂-OH
Hence, the total number of bonds are;
C-H Bonds = 3 + 2 + 2 = 7
C-O Bonds = 1
O-H Bond = 1
C-C Bonds = 2
The bond energies are as follows;
C-H Bonds = 413 kJ/mol
C-O Bonds = 358 kJ/mol
O-H Bond = 468 kJ/mol
C-C Bonds = 347 kJ/mol
Energy required to break the bonds in 1-propanol is therefore;
C-H Bonds = 413 kJ/mol × 7 = 2,891 kJ/mol
C-O Bonds = 358 kJ/mol × 1 = 358 kJ/mol
O-H Bond = 468 kJ/mol × 1 = 468 kJ/mol
C-C Bonds = 347 kJ/mol × 2 = 694 kJ/mol
The total energy to break all the bonds in 1 mole of 1-propanol = 4411 kJ/mol.
Use the drop-down menus to complete the statements
Answer:
First one: group
Second one: period
Third one: number of valence electrons
Last one: increases
Why does the weight of the dry ice go down while it’s sitting on the scale
Dry ice is colder, heavier, less messy than regular ice. If I understood your question correctly, the mass of it would decrease bc it is being dispersed into the air as carbon dioxide.
Explanation:
As a result of the transformation of solid carbon dioxide into carbon dioxide gas, which enters the atmosphere, the weight of the ice decreases and falls.
What is Melting?Melting, also known as fusion, is a physical process that causes a substance's phase transition from solid to liquid. This happens when the internal energy of a solid increases, typically through the application of heat or pressure, which raises the temperature of the substance to the melting point. Melting is the transformation of a solid into a liquid caused by the application of heat. In a pure crystalline solid, this process occurs at a fixed temperature known as the melting point; an impure solid usually melts over a range of temperatures below the melting point of the principal component.The melting point of a solid is the temperature at which melting occurs. In this process, heat is released from the solid.To learn more about Melting refer to:
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CHEM HELP PLEASE
a reaction that has been calculated to produce 346 g of CH3OH actually produced 312 g of CH3OH. what is it's percent yield?
Answer:
90.2%
Explanation:
% yield = actual yield/ theoretical yield * 100%
% yield = (312/346)*100% = 90.2%
Why does diamond not conduct electricity
Answer: no free electrons
Explanation: Diamond is very hard due to the strong covalent bonds and rigid tetrahedral 3d arrangement. It does not conduct electricity, as there are no electrons free to move and carry charge through the structure.
If the pH of a solution is 6.2, what would the pOH be?
O A. 7.8
B. 8.9
C. 12.4
D. 5.8
SUBMIT
Answer:
7.8
Explanation:
pH + pOH = 14
pOH = 14 - 6.2
= 7.8
What does the period number tell about the energy levels occupied by electrons in an atom?
Answer:
Number of energy levels that the element has.
Explanation:
The period number (n) is the outer energy level that is occupied by electrons. The period number that an element is in, is the number of energy levels that the element has.
Which phrase best describes the path of a light wave ?
A. Straight away from the source
B. Spiraling around the source
C. Perpendicular to the source
D. Parallel to the source
Answer:
La B
Explanation:
It's B on Ap3x
Straight away from the source
Which of the following statements describes electromagnetism?
Answer:
c)Magnetism can cause electrons to flow, and electricity can make a wire magnetic.
Explanation:
If this is your question:
Which of the following statements describes electromagnetism?
a)Magnetism and electricity are both used by society to do work.
b)Magnetism and electricity both include protons and electrons.
c)Magnetism can cause electrons to flow, and electricity can make a wire magnetic.
d)Electrons are attracted to the protons in magnets.
Answer:
magnetism can cause electrons to flow, and electricity can make a wire magnetic
Explanation:
a p e x :)
If two identical atoms are bonded together, what kind of molecule is formed?
A. A bent, nonpolar molecule
B. A linear, polar molecule
C. A linear, nonpolar molecule
D. A linear, ionic molecule
Answer:
C. A linear, nonpolar molecule
Explanation:
Molecules which are alike usually have the same degree of pull which results in them sharing electrons. This sharing of electrons is known as the molecules exhibiting Covalent bonding between them.
The equal pull also results in the cancelling out of electrons and favoring non polar bonds due to the absence of free electrons which would have been able to interact with H2O in a polar binding system.
Answer:
C
Explanation:
APEX
Which organic compound is saturated?
1.ethene
2.propene
3.ethyne
4.propane
Answer:
3. ethyne
Explanation:
Highest ratio of hydrogen to carbon? I'm not sure I found it on the internet but the answer is right
1. Calculate the pH of a 0.35 mol/L solution of ammonia.
Answer:
Explanation:
NH3 + H2O ⇌ NH4 + OH-
0.35 0.35
-log[OH-] = -log0.35 = 0.46 = pOH
14 - 0.46 = 13.54 = pH
H3PO4 + Ca(OH)2 → Ca(H2PO4)2 + H2O
Given question is incomplete. The complete question is as follows.
Balance the following equation:
[tex]H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + H_2O[/tex]
Answer: The balanced chemical equation is as follows.
[tex]2H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + 2H_2O[/tex]
Explanation:
When a chemical equation contains same number of atoms on both reactant and product side then this equation is known as balanced equation.
For example, [tex]H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + H_2O[/tex]
Number of atoms on reactant side:
H = 5
P = 1
O = 6
Ca = 1
Number of atoms on product side:
H = 6
P = 2
O = 9
Ca = 1
In order to balance this equation, we will multiply [tex]H_3PO_4[/tex] by 2 on reactant side and we will multiply [tex]H_2O[/tex] by 2 on product side. Hence, the balanced chemical equation is as follows.
[tex]2H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + 2H_2O[/tex]
H2(g) + I2(g) ↔2HI(g) + heat. If more I2 is added, in what direction will the equilibrium shift? Group of answer choices
Answer:
Towards the products, or to the right
Explanation:
There are no provided answer choices, but the answer should be to the right.
By Le Chatelier's principle, which basically can be summarized as "if you mess with chemistry, chemistry messes back", if more reactants are added, the equilibrium will shift to the right towards the products in order to make more products and counteract the increase in I₂.
What is the function of these organelles?
endoplasmic reticulum:
Golgi body:
mitochondrion:
ribosome
Answer:
endoplasmic reticulum:
✔ helps in the production and movement of materials
Golgi body:
✔ packages and distributes materials in and out of cell
mitochondrion:
✔ supplies energy that the cell uses
ribosome:
✔ produces proteins for the cell
Explanation:
I did it on Edge
The function of endoplasmic reticulum is it helps in production and movement of a material.
What is endoplasmic reticulum?Endoplasmic reticulum is defined as a network of membranous tubules present within the cytoplasm of a eukaryotic cell.
It is one of the important organ of human body system which helps us in production and movement of material from one body part to another.
Golgi body helps in packaging and distribution of material in and out of cells.
Mitochondrion supply the energy to the cell. It is called as a power house of cell.
Ribosome helps to produce protein for the cell. It is called as protein factory.
Thus, the function of endoplasmic reticulum is it helps in production and movement of a material.
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