Answers
Answer: The given decay sequence is [tex]^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He \rightarrow ^{234}_{91}Pa + ^{0}_{-1}\beta[/tex].
Explanation:
An alpha-particle is a helium atom. Hence, when an alpha decay occurs in [tex]^{238}_{92}U[/tex] then the reaction equation is as follows.
[tex]^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He[/tex]
Now, in sequence the equation for beta decay is as follows.
[tex]^{234}_{90}Th \rightarrow ^{234}_{91}Pa + ^{0}_{-1}\beta[/tex]
Hence, the sequence will be as follows.
[tex]^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He \rightarrow ^{234}_{91}Pa + ^{0}_{-1}\beta[/tex]
Thus, we can conclude that the given decay sequence is [tex]^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He \rightarrow ^{234}_{91}Pa + ^{0}_{-1}\beta[/tex].
Related Questions
If the change in velocity increases, what happens to the acceleration during the same time period?
Acceleration decreases.
Acceleration increases.
Acceleration becomes negative.
Acceleration becomes steady.
Answers
Answer:
Acceleration decreases
Answer:
its b
Explanation:
Read the following graduated cylinder.
How many ML?
Answers
Answer:
12.8 mL
Explanation:
the bolded bar indicates a count of 5. counting from there would add up to 8/10ths of a mL.
Which statement explains why catalysts are important for living
organisms? *
Catalysts increase the amount of product formed from limited reactants.
Catalysts cause gases to be produced at a slower rate, so cells don't burst.
Catalysts are used up during chemical reactions, so organisms must constantly make
new ones.
Catalysts allow chemical reactions to occur at temperatures at which the organism
lives.
Answers
Answer:
Catalysts allow chemical reactions to occur at temperatures at which the organism lives.
Explanation:
Catalysts are molecules that speeden the rate of chemical reaction by lowering the activation energy of the reaction. In a living system, the catalyst are ENZYMES, which help to hasten up many biochemical reactions.
Another function of catalyst in living systems is that it allows chemical reactions to occur at temperatures at which the organism lives.
How can you tell if an element has been reduced? A. The number of its electrons has not changed in the reaction, B. It has a positive oxidation state in the product, C. It has more electrons in the product than in the reactant, D. It has fewer electrons in the product than in the reactant.
Answers
Answer:
C. It has more electrons in the product than in the reactant
Explanation:
A type of reaction is called REDOX or oxidation-reduction reaction. In this reaction, substances (element or compounds) involved are either oxidized or reduced. To be oxidized means that a substance has lost electrons and hence, have a positive oxidation state in the product side.
On the other hand, reduction means that the substance has gained or accepted electrons, and hence has a reduced oxidation state in the product side. In other words, a reduced element will have more electrons in the product than in the reactant.
For example, in the following equation:
A + B = A- + B+
A is said to be reduced because it has more electrons (1) in the product than in the reactant (0).
2. When we lift a stool, its ____________
A) gravitational potential energy is increased
B) gravitational potential energy is decreased
C) kinetic energy is decreased
D) gravitational potential energy remains unchanged
Answers
A.)
Standing on an elevated ledge would be more potential energy than standing on the ground. Same applies for anything else -- Including a chair!
Discuss the phenomena of sunrise and sunset seen on Earth and describe how they will be different from the perspective of outer space.
Answers
Answer:
its very dark and scary
Explanation:
write a chemical equation for action of HBr on ethanol
Answers
answer:
hope this one helps have a great day !
Increasing the temperature of an endothermic reaction results in ____
· more reactants and products.
· no change in the quantities of reactants and products.
· more reactants and fewer products.
· fewer reactants and products.
· more products and fewer reactants.
Answers
Answer:
more reactents and products
3
.
The volume occupied by one mole of an ideal gas at 273K and 1.01x10% Pa is 22.4 dm'mol".
What volume of hydrogen, in dm", is produced when excess magnesium ribbon reacts with 100 cm?
of 2.00 mol dm hydrochloric acid?
Mg(s) + 2HCl(aq) → MgCl, (aq) + H2(g)
A.
0.100
B.
2.24
C.
4.48
D.
22.4
Answers
Answer:D
Explanation:
10. Which is an example of mechanical energy?*
(1 Point)
1. charges a computer battery
the energy stored in candy
2. a golfer hitting a golf ball
3. heat given off from your body
Answers
Answer: A golfer hitting a golf ball.
Explanation:
The atomic particles move more in this option than the others.
give three different between temporary and permanent change
Answers
Answer:
temporary is only for specific amount of time and permanent is suppost to mean forever
Explanation:
all i can say is not much can be permanent
How many silicons atoms are there in 0.0356 moles of silicon
Answers
Answer:
2.14 × 10²² atoms Si
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesStoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Identify
[Given] 0.0356 mol Si
[Solve] atoms Si
Step 2: Identify Conversions
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
Step 3: Convert
[DA] Set up: [tex]\dipslaystyle 0.0356 \ mol \ Si(\frac{6.022 \cdot 10^{23} \ atoms \ Si}{1 \ mol \ Si})[/tex][DA] Multiply [Cancel out units]: [tex]\dipslaystyle 2.14383 \cdot 10^{22} \ atoms \ Si[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
2.14383 × 10²² atoms Si ≈ 2.14 × 10²² atoms Si
Calculate how many methane molecules and how many carbon and hydrogen atoms are there in 25 g of Methane?
Answers
From the formula of methane it is clear that one mole of methane has 4hydrogen atoms. So, 37.6×1023 hydrogen atoms are there in 25.0 g of methane. Therefore, 9.4×1023methane molecules and 9.4×1023 hydrogen and 37.6×1023carbon atoms are there in 25.0 g of methane.
mark me brainliestt :))
When the gravimeter was invented.
Answers
Answer:
it was invented in 1960
Explanation:
it was descibed as a wooden instrument ideally suited for gravity programmes in areas of limited latitude and temperature variations
The complete combustion of methane can be seen in the equation: CH4 + 2 points
202 - CO2 + 2H2O If 50 g of methane are reacted completely, which
statement describes the reaction? *
O The total mass of the reactants is 50 g.
O The total mass of products is 50 g.
O The total mass of products is less than 50 g.
The total mass of reactants is greater than 50 g.
Answers
Answer: The statement total mass of reactants is greater than 50 g is true.
Explanation:
According to law of conservation of mass, it is known that mass can neither be created nor it can be destroyed but it can only be transformed from one form to another.
For example, [tex]CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O[/tex]
Here, mass of methane is 50 grams but oxygen is also present over here whose mass isn't given. This means that total mass of reactants is greater than 50 grams.
Thus, we can conclude that the statement total mass of reactants is greater than 50 g is true.
A gas at constant volume has a pressure of 2.80 atm at 400. K. What will be the pressure of the gas at 360. K? (4 points)
2.52 atm
2.94 atm
3.11 atm
3.78 atm
Answers
Option first 2.52 atm
Answer:
Solution given:
pressure 1[P1]=2.8atm
pressure 2[P2]=?
temperature [T1]=400k
temperature [T2]=360k
now
By using gas equation
P1V1/T1=P2V2/T2
since
volume is constant
P1/T1=P2/T2
2.8/400=P2/360
P2=2.8*360/400
P2= 2.52
Answer:
It's 2.52
Explanation:
This requires Gay-Lussac's Law, in which the relationship is P1 / T1 = P2 / T2. "P" stands for Pressure and "T" is Temperature. The first pressure is 2.80, the first temperature is 400 Kelvin, the second pressure is unknown (that's what your solving for), and your second temperature is 360 Kelvin. Because you don't have the second pressure, your equation will look like 2.80 atm x 360 K / 400. This will tell you that the pressure of the gas at 360 K will be 2.52.
I also took the test and it was correct.
can i do chemistry project on effects of caffeine
Answers
Answer:
You do as you wish, but it isn't a terrible idea.
Explanation:
Caffeine is a drug that has been normalized in society for a long time. But it's effects on the nervous, digestive, excretory, and circulatory systems are a good basis to start a project off of.
Cheers! (:
is carbon dioxide from a fire extinguisher a physical or chemical change?
Answers
Answer:
Fire is a chemical reaction between oxygen and the fuel. If you want to put out a fire, just get rid of one of those three things – fuel, oxygen or heat. ...It also prevents oxygen from reaching the fuel. Most fire extinguishers work by separating the fuel from the oxygen.
Explanation:
Answer:
It is a chemical change
Explanation:
three functions of the stem
Answers
The three functions of the stem:
To support the leaves,To conduct water, and To conduct minerals to the leaves.2. Stems transport materials between the root system, the leaves and the reproductive structures
3.Stems hold up reproductive structures, like flowers, which helps pollinators, such as bees, find the flowers.
why is it impostant during a science project to record measure
Answers
Answer:
it is important to be both accurate and precise. Accuracy represents how close a measurement comes to its true value. This is important because bad equipment, poor data processing or human error can lead to inaccurate results that are not very close to the truth.
Explanation:
hope this helps:)
Analyze the following chemical combinations
a) MgO
b)CaCl2
c) Na2O
Answers
How many moles of oxygen are required to react with methanol in order to produce 13 moles of formaldehyde?
Answers
Answer:
6.5 moles of Oxygen are required
Explanation:
Based on the reaction:
CH3OH + 1/2 O2 → CH2O + H2O
1 mole of methanol reacts with 1/2 moles O2 to produce 1 mole of formaldehyde and 1 mole of water.
Thus, to produe 13 moles of formaldehyde, CH2O, are needed:
13 moles CH2O * (1/2mol O2 / 1mol CH2O) =
6.5 moles of Oxygen are requireda force of 29 N and acceleration is 0.4 m/s what is the combined mass
Answers
Answer:
72.5Kg
Explanation:
that is the procedure above
what's radioactivity with a clear definition
Answers
Plz help it’s due very soon
Answers
Answer:
192g
Explanation:
so for this find out there moles of CH4 by moles=mass/mr
48/16=3 then use molar ratio 1:2 so times it by 2 which is 6 moles. then uses mass =moles*mr so 6*32=192g is the answer hope this helps to understand.
Answer:
64
Explanation:
En la electrosis del cloruro de sodio (Na Ci) el cloruro es atraido por elcatodo. Falso o verdadero. Y porque?
Answers
Answer:
Falso
Explanation:
La electrólisis es la descomposición de una solución cuando la corriente continua se pasa a través de ella.
La corriente entra y abandona el electrolito a través de los electrodos. El electrodo positivo se llama el ánodo mientras el electrodo negativo se llama cátodo.
Los iones positivos se mueven hacia el cátodo, mientras que los iones negativos se mueven hacia el ánodo.
Dado que el cloruro es un ion negativo, se mueve hacia el ánodo y no hacia el cátodo.
lime water turns milky when carbon dioxide gas passed through it and on further exposure to carbon dioxide the milkiness disappear, why
Answers
Resultant carbon dioxide passed through limewater in the right tube, producing a milky solution due to precipitation of the insoluble suspension of calcium carbonate: ... The milkiness disappears since calcium bicarbonate is water-soluble.
How many joules would be required to change the temperature of 250.0 g of aluminum from 15.0°C to 75.0°C? The specific heat capacity of a luminum is 24.2J/g°C.
Answers
how do you think the particles in a substance behave when we give them more energy?
Answers
Answer:
they speed up
Explanation:
if you give more heat to a substance they gain more energy which makes them speed up. if you add more particles to a substance the particles gain more pressure which if inside a container can put more strain on the container
example - a balloon
the more air you put into a balloon, the more likely it is to burst because there are more particles colliding with the sides of the container and there is less space
if you put the balloon under a heat source it is more likely to burst because the heat gives the particles more energy which then makes them collide with the container more as they are moving around more
what would the molarity of a solution be if you diluted 350 mL of 3 M NaOH to 1.4 Liters?
Answers
Answer:
0.75 M
Explanation:
Equation for dilution:
M1V1 = M2V2
Make units the same:
350 mL = 0.35 L
Plug the numbers into the equation
(3M) (0.35 L) = (M2) (1.4L)
Divide both sides by 1.4L
Which gives you 0.75 = M2