Answers
Answer:
Option C is correct = ₈₅At²²⁰
Explanation:
Given radioactive decay shows the beta emission.
²²⁰₈₄Po ₈₅At²²⁰ + ⁰₋₁e ⁻
Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.
Properties of beta radiations:
1) They can travel in air in few meter distance.
2) These radiations can penetrate into the human skin.
3) The mass of beta particle is smaller than the alpha particles.
4) The sheet of aluminium is used to block the beta radiation
¹⁴₆C → ¹⁴₇N + ⁰₋₁e ⁻
The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.
Related Questions
Which of the following statements is/are correct? i. Principal energy levels are identified by the letters s, p, d, and f. ii. Principal energy levels appear in both the quantum mechanical model of the atom and the Bohr model of the atom. iii. In general, n = 1 is at lower energy than n = 2, and n = 2 is lower than n = 3, and so on. iv. The principal energy level is related to electron spin. a. i only b. iv only c. i and ii d. ii and iii e. iii and iv
Answers
Answer:
d. ii and iii
Explanation:
Both the Bohr model and the wave (quantum) mechanical models of the atom recognize the principal quantum number n. The principal quantum number shows the shell or energy level where an electron may be found.
The energy levels are arranged in increasing order of magnitude. That is n=1 >n=2=n=3 etc
Is avocado a fruit or a vegetable?
(dont me with my question rn xD)
Answers
The rate of reaction in terms of the "rate law expression" includes the rate constant (kk), the concentration of the reactants, and the orders of the reaction with respect to the different reactants. Consider the following reaction: A+B→C+DA+B→C+D The initial concentrations of the reactants AA and BB are 0.200 MM and 0.350 MM, respectively. The rate of reaction is 0.060 M⋅s−1M⋅s−1, and the orders of the reaction, with respect to reactants AA and BB, are 1 and 2, respectively. Determine the rate constant (kk) for the reaction using the rate law. Express your answer in M−2⋅s−1M−2⋅s−1 to three significant figures.
Answers
Answer:
[tex]k=2.45M^{-2}s^{-1}[/tex]
Explanation:
Hello.
In this case, considering the given specific orders of reaction, we can write the rate law as:
[tex]r=k[A][B]^2[/tex]
Thus, considering the concentrations of A and B to be 0.200 M and 0.350 M respectively and a rate of 0.060 M/s, the rate constant turns out:
[tex]k=\frac{r}{[A][B]^2}\\ \\k=\frac{0.060M/s}{(0.200M)(0.350M)^2} \\\\k=2.45M^{-2}s^{-1}[/tex]
This is what we know as a third-order reaction since the specific orders both add to 3.
Best regards.
How much heat is required to raise the temperature of 93.5 gg of water from its melting point to its boiling point
Answers
Answer:
39270 J
Explanation:
The quantity of heat required to raise the temperature of a substance from its initial temperature to its final temperature is given by:
Q = mCΔT
m = mass of substance, C = specific heat capacity of substance, ΔT = temperature change = final temperature - initial temperature
Melting point = 0°C, boiling point = 100°C, m = 93.5 g = 0.0935 g, ΔT = boiling point - melting point = 100 - 0 = 100°C, C = 4200 J/kg°C
Q = mCΔT
Q = 0.0935 × 4200 × 100 = 39270 J
how many seconds is in 1 year
Answers
Explanation:
hope it helps :)
Mass is a unique property of any property.
Answers
Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity. measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more. without changing the composition of matter. Physical properties are used to observe and describe matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others. Key Points
Matter can exist in one of three main states: solid, liquid, or gas.
Solid matter is composed of tightly packed particles. ...
Liquid matter is made of more loosely packed particles. ...
Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume. the same whether the sample being observed is large or small. Examples of characteristic properties include freezing/melting point, boiling/condensing point, density, viscosity, and solubility.
Examples of chemical properties include flammability, toxicity, acidity, reactivity (many types), and heat of combustion.
4. A method in which two or more components of different sizes are sepa-
rated from a mixture on the basis of the difference in their sizes.
Answers
Answer: Sieving
Im 100% sure its the answer!
If 65,000 J of energy were transferred to 450 g of water at 20˚C. What would have been the final temperature of the water?
Answers
Answer:
500g
Explanation:
Answer:Suppose that during the Icy Hot lab that 65 KJ of energy were transfered to 450 g of water at 20 degrees C. What would have been the final temerpatur
Explanation:
Which of the following can be broken down by chemical processes but not physical processes?
elements
compounds
all of these
mixtures
Answers
Answer:
Elements and compounds
Explanation:
Elements and compounds, mixtures are not chemically bonded and can be physically seperated
Viktor tests a solution with a strip of blue litmus paper. The paper turns pink. The solution is a _____.
weak acid
weak base
strong acid
strong base
Answers
Answer:
The solution is acidic.
Explanation:
Have a good day!
Explain the arrangement of the first 20 elements in the periodic table.
Please help! Will give brainliest!
Answers
There are various kind of elements that are present in periodic table. Elements that are metals are kept on left side of periodic table and elements which are non metals are kept on right side of periodic table.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals and metalloids element arranges in increasing atomic number.
The first 20 elements of periodic table are Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Potassium and Calcium. Out of these Lithium, Beryllium, Sodium, Magnesium. Potassium and Calcium are metals so they are kept on the left side of the periodic table while others are non metals so they are kept on right side of periodic table.
Learn more about periodic table, here:
https://brainly.com/question/11155928
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What do metalloids and non metals have in common
Answers
Answer:
Metalloids are brittle like Non-Metals
Explanation:
How are gases and liquids different from each other? O A. Liquids can change volume, and gases cannot. B. Gases can change shape, and liquids cannot. C. Liquids can change shape, and gases cannot. D. Gases can change volume, and liquids cannot.
Answers
Answer:
d
Explanation:
d is the right answer since gases do not have definite shape and volume and liquids have definite volume. so liquid cannot change its volume but gas can
Can you determine the equation for density?
Answers
Answer:
YESBSJSKSSKEKEJRJRJER
2.6
+
3.78
How do you solve this problem
Answers
Answer:
6.38
Explanation:
line up the decimals
it helps to add another 0 to 2.6 so that you can align them better
1
2.60
+ 3.78
= 6.38
8 + 0 = 8
6 + 7 = 13; write 3 and carry the one over above the 2 in 2.60
2 + 3 + 1 = 6
I tried my best to show it through text.
The reactants are
A
the substances present when the reactions begin.
B
the substances present when the reaction is complete.
C
the properties that change after the reaction.
D
the energy that is released or stored during the reaction.
pls, hurry!!!!!!!!!!!!!!!!
Answers
What element has an atomic mass 4?
Answers
Answer:
Helium has atomic mass 4.002602.
So the answer to yr question is helium.
The diagram below shows a lithium atom. Which of the following correctly lists the particles in a lithium atom? *
Captionless Image
A. 3 protons, 4 neutrons, 3 electrons
B. 3 protons, 3 neutrons, 4 electrons
C. 4 protons, 4 neutrons, 3 electrons
D. 4 protons, 3 neutrons, 4 electrons
Answers
What body of water is south of Constantinople? Atlantic Ocean Indus River Black Sea Mediterranean Sea
Answers
Hahahahhahahahahah
Why does water vapor
condense at higher
elevations?
A. cooling causes condensation
B. faster particle activity
C. due to a chemical change
D. due to a chemical reaction
Answers
Answer:
A. cooling causes condensation
Explanation:
air is cooler at higher altitude in the troposphere.
Which group is the most reactive?
*
Alkaline Earth Metals
Alkali metals
Noble Gases
Lanthanides
Answers
Answer:
alkali metals- Group 1
Explanation:
they have less valence electrons and therefore are more reactive
Why are mass and weight different measurements?
Answers
Explanation:
Mass, is amout of matter contained in body
it value remain constant
it cannot be zero
weight is gravitational force which attract body towards centre of earth
it value changes
it can be zero
Which factor is most important to consider when evaluating a journal article about global warming? Is the article long enough? Does the article contain facts or only opinions? Did the author of the article use complex, scientific words? Does the author of the article have a doctorate degree?
Answers
Answer:
Does the article contain facts or only opinions
Got it right on edg.
Answer:
B) Does the article contain facts or only opinions?
Explanation:
What atomic symbol completes this reaction?
238 234.
U →
Th + ?
90
92
Answers
Answer:
Correct option is ₂⁴He
Explanation:
Uranium-238 undergo alpha decay and produce Th-234 and alpha particle.
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴ + energy
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. It is also called helium nuclei. When atom undergoes the alpha emission the parent atom converted into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom.
Properties of alpha radiation:
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
what are proteins? (simple definition please)
Answers
Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues. Hope this helps!
Answer:
Proteins are carbohydrates that come from nutritious food.
They are one of the four main carbohydrates.
This is a simple definition of the word proteins.
Hope this helps!
For the equation 2 HCI + Zn ⇒ H₂ +ZnCI₂ suppose you had 2.00 g HCI and enough Zn.
a. What mass, in grams, would you have of Zn?
b. How many grams of H₂ would be produced?
Please show your work!!
Answers
Answer:
Zinc weighs 65.38 grams per mole, so we’ve got 0.994 moles of zinc (I’ll worry about sig figs at the end). HCl weighs 36.46 grams per mile, so we’ve got 1.78 moles of HCl. However, two moles of HCl react with one mole of zinc. So only 1.78/2 = 0.890 moles of Zinc are going to react.
One mole of zinc produces one mole of hydrogen, which weigh 2.02 grams per mole. So 0.890 moles * 2.02 grams/mole means 1.90 grams of hydrogen will be produced.
Since we have 2 sig figs in the weights given, the answer should have 2 sig figs, thus 1.9 grams.
This is just an example
g The free energy change of the reaction A (g) ---> B(g) is zero under certain conditions. The STANDARD Free energy change of the reaction is -42.5 kJ. Which of the following statements must be true about the reaction described here? A) The concentration of the product is greater than the concentration of the reactant. B) The reaction is at equilibrium. C) The concentration of the reactant is greater than the concentration of the product.
Answers
Answer:
The reaction is at equilibrium.
Explanation:
In thermodynamics, the Gibbs free energy is a term used traditionally to refer to the available or useful work that can be obtained from a thermodynamic system.
Gibbs free energy is a measure of the chemical potential that a reaction has left to do work. Hence, if the free energy is zero, then the reaction has attained equilibrium, and there is no more work to be done
The statement that should be true related to the reaction should be that it should be at equilibrium.
What is Gibbs free energy?In terms of thermodynamics, this energy should be applied for the availability or the useful work that should be obtained via the system of thermodynamics.
Also, it determined the chemical potential where the reaction has left for doing the work. Also in the case when the free energy should be zero so here the reaction should be attained the equilibrium.
hence, the option b is correct.
Learn more about energy here:
A ________________ causes a __________________ heat transfer rate.
Answers
Answer:
A smaller temperature difference causes a smaller heat transfer
Explanation:
The greater the temperature difference, the greater the rate at which heat transfers.
An object has a mass of 35.00 grams. On Luixandras balance it weighs 33.95 grams. What is the percent error in this balance?
Answers
Answer:
The answer is 3 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual mass = 35 g
error = 35 - 33.95 = 1.05
We have
[tex]p(\%) = \frac{1.05}{35} \times 100 \\ [/tex]
We have the final answer as
3 %Hope this helps you
Concentration data is commonly monitored during a reaction to determine the order with respect to a reactant. Consider the types of observations listed, and determine which order is likely for that reactant. Assume all other factors are held constant.
An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially.
Choose...first order, second order, zero order
The reaction rate increases in direct proportion to the concentration of the reactant in solution.
Choose...first order, second order, zero order
The reaction rate is constant regardless of the amount of reactant in solution.
Choose...first order, second order, zero order
Answers
Answer:
An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially - first order
The reaction rate increases in direct proportion to the concentration of the reactant in solution -second order
The reaction rate is constant regardless of the amount of reactant in solution - zero order
Explanation:
The Order of Reaction refers to the power dependence of the rate on the concentration of each reactant. The order of reaction is determined experimentally and not necessarily by inspection.
Typically, in a second order reaction, the rate of reaction increases in proportion to increase in concentration.
For a first order reaction, the rate of reaction increases exponentially as the increase in concentration.
For a zero order reaction, the rate of reaction is independent of the concentration of the reactant.