Answers
The daughter isotope : Radon-222 (Rn-222).
Further explanationGiven
Radium (Ra-226) undergoes an alpha decay
Required
The daughter nuclide
Solution
Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,
alpha α particles ₂He⁴ beta β ₋₁e⁰ particles gamma particles ₀γ⁰ positron particles ₁e⁰ neutron ₀n¹The decay reaction uses the principle: the sum of the atomic number and mass number before and after decay are the same
Radium (Ra-226) : ₈₈²²⁶Ra
Alpha particles : ₂⁴He
So Radon-226 emits alpha α particles ₂He⁴ , so the atomic number decreases by 2, mass number decreases by 4
The reaction :
₈₈²²⁶Ra ⇒ ₂⁴He + ₈₆²²²Rn
Related Questions
If you eat food containing 1800 Calories per day, according to an advertisement
you will lose weight. A handbook says that a person uses 20,000 kJ per day, given normal waking and sleeping activities. Will the person lose weight if he or she eats food as suggested by the advertisement?
Answers
Answer:
No he or she will not lose weight
No, the person will not lose weight if they eat food containing 1800 Calories per day based on the given information.
To determine if a person will lose weight, we need to compare their calorie intake with their calorie expenditure. The advertisement suggests consuming 1800 Calories per day, which is equivalent to approximately 7536 kJ (1 Calorie = 4.184 kJ).
The handbook states that a person uses 20,000 kJ per day, which is their estimated calorie expenditure. If the person consumes 7536 kJ (1800 Calories) and expends 20,000 kJ per day, there is an energy imbalance. The person is consuming fewer calories than they are expending, resulting in a calorie deficit.
In this scenario, the person is likely to lose weight. To maintain their current weight, their calorie intake should match their calorie expenditure. However, since their calorie intake is lower than their expenditure, their body will need to rely on stored energy (fat reserves) to make up the difference. This can lead to weight loss over time.
It's important to note that weight loss is influenced by various factors, including individual metabolism, body composition, and overall health. Caloric intake should be balanced with proper nutrition and physical activity to support overall well-being. It's always advisable to consult a healthcare professional or registered dietitian for personalized guidance on weight management.
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The Chinese first began recording astronomical observations about 2,000 years ago.
True
False
Answers
what is 78%
of 100? help
Answers
Answer:
78
Explanation:
You have 100%, you take 22% and get 78%
Here is the reaction of carbamic acid and ammonia to form an amide and water. There is a scheme of a reversible reaction where carbamic acid reacts with ammonia to give water and an unknown compound. Carbamic acid is H2NCOH with an oxygen atom attached to the carbon atom by a double bond. Ammonia is a nitrogen atom with three H atoms attached. Water is HOH. Draw the amide product of this reaction.
Answers
Answer:
See explanation
Explanation:
I have attempted to show the sequence of the reaction between carbamic acid and ammonia to form an amide and water and urea.
The reaction first involves the protonation of ammonia to give ammonium carbamate.
When ammonium carbamate is heated to 130-140 degrees, we obtain urea and water as the final products of the reaction
Which climate is a subcategory of polar climate
A ice cap
B subarctic
C highlands
D humid continental
Answers
Answer:
Ice cap
Explanation:
See its polar so like north pole and north pole is ice cap.
Answer:
Ice cap
Explanation:
If you were to burn a candle inside of a closed jar and the mass of the
closed jar and candle was 50 grams to begin with, what would the mass of
the jar and smoke be after the candle is done burning?
Answers
Answer:
50g
Explanation:
At the end of the burning process, the mass of the jar and smoke should be 50g after the candle burning is done.
In most systems, the law of conservation of matter finds expression. According to this law "matter is neither created nor destroyed but atoms are rearranged".
In this kind of system, no matter is allowed to escaped and the starting mass of the reactants compared to that of the product will be the same.
THE ANSWER IS
Magnesium hydroxide (Mg(OH)2): 58.33
Iron(III) oxide (Fe2O3): 159.70
Answers
Answer:
Ok, thanks?
Have a good day
Thanks for the answer ^^...yes i only commented for the points
The Water Cycle: Lesson
Mckenze Jelks
Which example best shows how the water cycle carries on energy transfer?
Choose the correct answer.
O a flooding river depositing silt on a floodplain
O a warm ocean current warming the air above it
O ocean water depositing sand particles on a shore
O water seeping through the soil and dissolving salts
Answers
What is the mass in grams of 2.21 mole of Ca3(PO4)4?
Answers
Answer:
1105.29 grams
Explanation:
If you calculate the molar mass of Ca3(PO4)4 you'll get 500.13. Molar mass is the mass of one mole of a substance. Multiply 500.1194 by 2.21 because we have 2.21 moles to get 1105.264 grams.
The molar mass of Ca is 40.078 grams, and there are 3 of them. So 40.078 x 3 is 120.234 grams.
The molar mass of P is 30.974 and there are 4 P's, so 30.974 x 4 is 123.896 grams.
The molar mass of O is 16 grams and there are 6 of them. Again, 16 x 16 is 256 grams.
Add up 120.234 + 123.896 + 256 to get the molar mass of Ca3(PO4)4, 500.13.
Why is one side of the moon called "the dark side of the moon"?
Answers
Answer:
Option C
Explanation:
The answer is option C or "The amount of time it takes to rotate around it's axis is the same amount of time it takes to revolve around Earth."Remember that the Earth and the Moons amount of time to make a full rotation is almost in sync and they're two sides of the moon, one side we do not see and that's because that side is currently faced away from the Earth which is called the dark side of the moon. Each side has two weeks oh night, and two weeks of day because of how long it takes the moon to revolve, so while we have a side towards the Earth which is illuminated by the sun we have another pointing away in the dark.
Hope this helps.
Calculate the mass of water produced when 7.26 g of butane reacts with excess oxygen
Answers
Answer:
11.3 g.
Explanation:
Hello there!
In this case, since the combustion of butane is:
[tex]C_4H_{10}+\frac{13}{2} O_2\rightarrow 4CO_2+5H_2O[/tex]
Thus, since there is a 1:5 mole ratio between butane and water, we obtain the following mass of water:
[tex]m_{H_2O}=7.26gC_4H_{10}*\frac{1molC_4H_{10}}{58.14gC_4H_{10}}*\frac{5molH_2O}{1molC_4H_{10}} *\frac{18.02gH_2O}{1molH_2O}[/tex]
Therefore, the resulting mass of water is:
[tex]m_{H_2O}=11.3gH_2O[/tex]
Best regards!
How are the cells made by meiosis different from the original parent cell that
produced them?
Answers
Consider a disubstituted aromatic compound. The parent name is benzene and there is a chloro and bromo substituent. Disubstituted benzenes can be described using the terms ortho, meta and para, depending on their relative distance from each other. The terms are often just abbreviated as o, m and p. In addition, the IUPAC name can use locant numbers instead of the descriptor. Br
Select the correct names for the structure.
1. 1-bromo-3-chlorobenzene
2. 3-bromo-1-chlorobenzene
3. meta-bromochlorobenzene
4. o-bromochlorobenzene
5. ortho-bromochlorobenzene
6. m-bromochlorobenzene
Answers
Answer:The correct names for the structure are:
--> 1. 1-bromo-3-chlorobenzene.
--> 3. meta-bromochlorobenzene.
--> 6. m-bromochlorobenzene.
Explanation:
Benzene is the simplest member of the aromatic hydrocarbons. It has a ring structure consisting of six carbon and six hydrogen atoms. This equally means that a benzene can have up to six substituents. One of the chemical properties is that benzene and other members of its series undergo substitution reaction whereby one or more of its six hydrogen atoms is replaced by monoatomic reagents.
Disubstituted benzene consists of two substituents which are described based on either numerical locants or specific words for the three possible forms.
The numerical locant method are used the same naming substitutes of other hydrocarbons. From the question, the numerical locant method was derived through using the following steps:
--> the functional group is benzene
--> there are two substituents which includes bromine( written as bromo) and chlorine ( written as chloro)
--> while placing the number, it's done alphabetically ('1-bromo' comes before '3-chloro') in a clockwise manner. This is to give chorine the lowest locant number.
The second naming method for a disubstituted benzene is the the ortho-, meta-, para- (or their singel letter equivalent) nomenclature method. This is only used for benzene structures.
--> ortho or O : this is used when the substituents are close to each other in the benzene ring.
--> meta or (m) : This is used when the substituents are separated by one carbon in the benzene ring.
--> para or (p): This is used when the substituents are across each other in the benzene ring
From the question, the bromine substituent is separated from the chlorine by one carbon atom, therefore it's meta-bromochlorobenzene or m-bromochlorobenzene.
Which of the following explains the difference between speed and velocity?
A. Velocity has motion, and speed does not.
B. Velocity has direction, and speed does not.
C. Speed has motion, and velocity does not.
D. Speed has direction, and velocity does not.
Answers
Answer:
B. Velocity has direction, and speed does not.
Explanation:
Velocity is a vector, meaning it has both a magnitude and direction. Speed is a scalar, meaning it only has a magnitude and no direction.
explain how the particles of a substance change as a substance changes from a solid to a liquid to a gas.
Answers
Answer:
Some substances can change from the solid state to the gas state without ever becoming a liquid. During this process, known as sublimation, the sur- face particles of the solid gain enough energy to become a gas.When dry ice becomes a gas, it absorbs thermal energy from water vapor in the air.
Explanation:
a reaction vessel contains a small piece of magnesium metal and air (20%) of which is oxygen gas. The mixture is ignited and burns with a burst of light and heat, producing solid magneisum oxide. The mass of mgO, however, is less than the initital mass of magnesium and oxygen combined. What loss of mass
Answers
Answer: see below
Explanation:
Mg burning in air gives MgO and a smaller amount of Mg3N2
2Mg+O2=2MgO. 2*24.3+32=2*40.3
3Mg+N2=Mg3N2
Ignoring the nitride, MgO loss of mass during the reaction can be ascribed to
(1) relativistic loss as energy (too small to be measurable)
(2) During the reaction, which is strongly exothermic, a fraction f the material is blown off as tiny particles which adhere to the vessel.
Some students use an apple to represent the Earth. What is the best reason to use an apple for this comparison?
a. The skin of an apple is very thin, and the crust of the Earth very thin.
b. The flesh of an apple is made of the same material all the way through, and the interior of the Earth is the same all the way through.
c. The seeds of the apple are very light in comparison to the rest of the apple, and the core of the Earth is also made of very light matter.
d. The stem of the apple comes from the core and the North Pole comes from the Earth’s core.
Answers
A 40.5 g sample of aluminum is cooled 7.5°C. The specific heat capacity of aluminum is
0.900 J/g°C. What is the energy change for this sample?
Answers
Q= 40.5g x 0.900 J/g degree Celsius x 7.5
Q= 273.4 J.
Even if it is cooled , we use the same temperature as heating it.
how many NaF is 4.50 mol
Answers
Many popular brands of toothpaste contain about 1.00 mg of fluoride per gram of toothpaste. The fluoride compound that is most often used in toothpaste is sodium fluoride, NaF, which is 45% fluoride by mass. How many milligrams of NaF are in a 250.0 g tube of toothpaste
Answers
Answer:
Mass of NaF in 250 g tube of toothpaste = 100 mg of NaF
Explanation:
Mass of fluoride per gram of toothpaste = 1 mg
From the given data, the fluoride compound that is most often used in toothpaste is sodium fluoride, NaF, which is 45% fluoride by mass, mass of sodium fluoride per gram of toothpaste can be determined as follows:
1 mg of fluoride per gram of toothpaste = 45% total mass of NaF per gram of toothpaste
100% mass of NaF in toothpaste = 100/45 * 1 mg = 2.22 mg of NaF.
Therefore, mass of NaF per gram of toothpaste is 2.22 mg.
The mass of NaF in 250 g of toothpaste is then calculated below:
In 250 g of toothpaste, mass of NaF = 250 * 2.22 mg = 99.9 mg of NaF
2. What is the final temperature when a 32.0 g piece of diamond at 33.5°C is heated with 360 J of energy?
(Cp = 0.509
Answers
Answer:
55.6 °C
Explanation:
From the question given above, the following data were obtained:
Mass (M) of diamond = 32.0 g
Initial temperature (T₁) = 33.5°C
Heat (Q) required = 360 J
Specific heat capacity (C) of diamond = 0.509 J/gºC
Final temperature (T₂) =?
Next, we shall determine the change in temperature. This can be obtained as follow:
The final temperature can be obtained as follow:
Mass (M) of diamond = 32.0 g
Heat (Q) required = 360 J
Specific heat capacity (C) of diamond = 0.509 J/gºC
Change in temperature (ΔT ) =?
Q = MCΔT
360 = 32 × 0.509 × ΔT
360 = 16.288 × ΔT
Divide both side by 16.288
ΔT = 360 / 16.288
ΔT = 22.1 °C
Finally, we shall determine the final temperature. This can be obtained as follow:
Initial temperature (T₁) = 33.5°C
Change in temperature (ΔT ) = 22.1 °C
Final temperature (T₂) =?
ΔT = T₂ – T₁
22.1 = T₂ – 33.5
Collect like terms
22.1 + 33.5 = T₂
T₂ = 55.6 °C
Therefore, the final temperature is 55.6 °C.
What are essential elements in plants?
Answers
Answer:
Chlorophyll is one. I can't quite remember other
The value of the rate constant for a gas phase reaction can be changed by increasing the A. temperature of the reaction vessel. B. volume of the reaction vessel. C. pressure of the reactant. D. amount of product.
Answers
Answer:
temperature of the reaction vessel
Explanation:
temperature of the reaction vessel
The value of the rate constant for a gas phase chemical reaction can be changed by increasing the: A. temperature of the reaction vessel.
What is the rate constant?In Chemistry, rate constant is typically used with rate law to tell the reaction rate or rate of a chemical reaction that is affected by activation energy.
The rate law equation.Mathematically, the rate law is given by this formula:
[tex]R = k[A]^x[B]^y[/tex]
Where:
k is the rate constant.A is the concentration of reactant A.B is the concentration of reactant B.Generally, the value of the rate constant for a gas phase chemical reaction can be changed by increasing the temperature of the vessel (container) that is used in conducting the chemical reaction.
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Convert 8.876 × 10^12 m^2 to units of km^2.
Answers
Answer:
[tex]8.876\times 10^{18}\ km^2[/tex]
Explanation:
In this problem, we need to convert [tex]8.876 \times 10^{12}\ m^2[/tex] to km².
We know that,
1 km = 1000 m
⇒ 1 km² = 10⁶ m²
So,
[tex]8.876 \times 10^{12}\ m^2=8.876 \times 10^{12}\times 10^6\ km^2\\\\=8.876\times 10^{18}\ km^2[/tex]
So, [tex]8.876 \times 10^{12}\ m^2[/tex] is equal to [tex]8.876\times 10^{18}\ km^2[/tex].
g) How many grams of aluminum (Al) are present in 2.98 mol of Al?
h) How many moles of Br are there if the sample contained 5.6 x 1024 atoms of Br?
Answers
Answer:
26.982 g
i think so..........
Two units of distance used by scientists to describe distances in space are the light-year and astronomical unit. Why do scientists use the light-year instead of Astronomical Units to measure the distances between stars?
The speed of sound is too slow.
Telescopes can measure only in light years
Distant stars can only be seen if there is light
The smaller numbers that result from measuring with larger units are easier to use
Answers
Answer:
The smaller numbers that result from measuring with larger units are easier to use .
That’s the one, good luck!
The smaller numbers that result from measuring with larger units are easier to use.
Light year is a unit of astronomical distance that measures the distance traveled by light in one year. The distance between stars can also be measured using parsecs.
The equivalent of this distance in various units is written as follows;
1 light year (ly) = 9.5 x 10¹² km = 63,240 AU1 parsec = 3.26 lyUsing light year to represent the unit of distance is more concise because big measurement can be represented easily with small numbers using this large unit.
Thus, we can conclude that the smaller numbers that result from measuring with larger units are easier to use.
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(10 points) A basement (with volume V) in a residence is found to be contaminated with radon coming from the ground through the floor drains. The concentration of radon in the room is [Co] under steady-state conditions. The room behaves as a CSTR, and the decay of radon is a firstorder reaction with a decay rate constant of [k]. a. Now the condition changes: The source of radon is closed off but there is no ventilation. What is the equation that describes the concentration of radon in the basement with time [Ct]
Answers
Answer:
[tex]\mathbf{C_{Out} = C_o \ exp \Big [ - \Big ( \dfrac{1}{\dfrac{V}{Q} } + k \Big) t \Big ] }[/tex]
Explanation:
The equation that describes the concentration of the radon in the basement with time Ct is;
[tex]\mathbf{C_{Out} = C_o \ exp \Big [ - \Big ( \dfrac{1}{\theta} + k \Big) t \Big ] }[/tex]
where;
[tex]C_o[/tex] = concentration of the radon
[tex]C _ {Out}[/tex] = allowable radon concentration
k = decay rate constant
= theoretical detention
t = time needed to lower the radon concentration
The theoretical detention [tex]\theta =\dfrac{V}{Q}[/tex]
∴
[tex]\mathbf{C_{Out} = C_o \ exp \Big [ - \Big ( \dfrac{1}{\dfrac{V}{Q} } + k \Big) t \Big ] }[/tex]
Why is HCI a strong acid and HCIO a weak acid?
Answers
Strong Acid: dissolves and dissociates 100% to produce protons (H+) 1. seven strong acids: HCl, HBr, HI, HNO3, H2SO4, HClO4, & HClO3 2. ... Weak Acid: dissolves but less than 100% dissociates to produce protons (H+) 1.
(30 POINTS) Which order shows the levels of organization from largest to smallest?
organism, organ system, cell, organ, tissue
organism, tissue, organ system, organ, cell
organism, organ, organ system, cell, tissue
organism, organ system, organ, tissue, cell
Answers
Answer:
cell,tissue,organ,organ system,organism
Answer:
Why is the liquid oxygen machine producing less liquid oxygen than normal?
Answers
Answer:
Liquid oxygen evaporates at only a slightly higher temperature than liquid nitrogen because they have similarly low attraction between molecules. This would mean less liquid oxygen is coming out of tank 3 because some of it is evaporating as a gas instead.
The liquid oxygen machine is producing less liquid oxygen than normal because there's a low attraction between the molecules.
It should be noted that oxygen in its liquid state will take up less space. It can also be stored at a lower pressure than when it's in its gaseous state.
From the complete question, the liquid oxygen evaporates at a slightly higher temperature than the liquid nitrogen. The reason for this is due to the fact that they have similarly low attraction between molecules.
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