Answer:
²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He +⁰₀γ
Explanation:
This radioactive decay occurs when the unstable radium-226 atom wants to lose energy by emitting an alpha particle from its nucleus which is an helium nucleus with no electron. The radium (86) is transformed to radon(Rn) where the atomic number of radium (88) is reduced by two units into radon, Rn (86) and mass number reduced by 4 units.
The equation for the transformation is;
²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He +⁰₀γ where
²²⁶₈₈Ra ---------radium-226
²²²₈₆Rn -------radon-222
⁴₂He ----------alpha particle
⁰₀γ ------------energy
Note that ⁴₂He can also be written as : ⁴₂∝
Answer:
it is alpha decay
Explanation:
im albert einstien
186000 written in scientific notation
Answer:
its 1.86 x 105
Explanation:
i learned it last year
Answer:
1.86 x 10^5
plz, mark brainliest
What is the difference between an element and a compound? Give an example of each.
please answer in a sentence.
Answer:
An element is a single atom by itself found on the periodic table. A compound is made when two or more elements chemically bond together. An example of an element is hydrogen. (H) An example of a compound is [tex]H_{2} O[/tex].
Explanation:
explained above
emelie is working on a science project. her task is to answer the question does rogooti a hair cream sold on tv affect the speed of hair growth in length her family is willing to volunteer for the experiment
Answer:
This question is incomplete and unclear; the complete question including the missing part is:
Emelie is working on a science project. Her task is to answer the question:
"Does Rogooti (a hair cream sold on TV) affect the speed of hair growth
(in length)". Her family is willing to volunteer for the experiment. Identify the control group (CG) and the independent and dependent variables.
ANSWER:
Independent variable: Rogooti hair cream
Dependent variable: Speed of hair growth/length
Control group: Family members that do not use the Rogooti hair cream
Explanation:
In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to bring about a measurable response. In this case, the ROGOOTI HAIR CREAM is the independent variable.
Dependent variable refers to the variable that is measured or the variable that responds to the change made to the independent variable. In this case, the dependent variable is SPEED AT WHICH HAIR GROWS (IN LENGTH).
Control group in an experiment is the group that does not receive the experimental treatment. In this case, the experimental treatment is the Rogooti hair cream, hence, the control group will be the VOLUNTEER FAMILY MEMBERS THAT DOES NOT RECEIVE THE ROGOOTI HAIR CREAM ON THEIR HAIR.
PLZ HELPS ME! WILL GIVE BRAINLIEST!!!!
1. In the mathematical equation for transverse waves, the symbol neu represents ts the _________.
A. Energy
B. Frequency
C. Speed of sound
D. Wavelength
2. What is the frequency of a 6.43 x 10^-5 m wave?
A. 4.66 x 10 ^ 12 hz
B. 5.5 x 10 ^ 7 hz
C. 1.03 x 10 ^ 4 hz
D. 1.2 10^15 hz
3. What is the wavelength of a 1.28 x 10^17 Hz wave?
A. 4.66 x 10 ^ 12 m
B. 8.1 x 10 ^4 m
C. 6.9 x 10^-8 m
D. 4.26 x 10^8 m
4. What is the wavelength of a wave having a frequency of 5.21 x 10^14 s-1?
A. 1.26 x 10^16 m
B. 7.1 x 10 ^ 7 m
C. 5.74 x 10^-7 m
D. 2.07 x 10 ^15 m
Answer:
1) wavelength
2) 1.03 x 10 ^ 4 hz
3) 8.1 x 10 ^4 m
Explanation:
Answer:
1) wavelength
2) 1.03 x 10 ^ 4 hz
3) 8.1 x 10 ^4 m
Explanation:
please help!!!!!!!!!!!
Answer:
I think it is B
Explanation:
Both prokaryotes and eukaryotes have all of those things except for organelles, which only eukaryotes have (also prokaryotes are smaller not eukaryotes)
In paper chromatography, is the substance being tested the solute or the solvent?
Answer:
Explanation:
This is an awfully good question. Think carefully about which is which.
A solvent is something that will dissolve the solute.
So the solvent will carry the solute up (say) chromatography paper. It is the solute.
the number of electrons if not ionized
Your answer
Answer:
What????
Explanation:
20 characters
Which of the following best describes a person doing science?
o A.
Dominick uses a computer to do his math homework.
O B. Lindsay measures the sizes of the craters on the Moon.
O C.
Isabel invents a new kind of doorknob.
o
D. Murray randomly predicts the result of a coin toss.
Answer:
B. Lindsay measures the sizes of the craters on the moon
Answer:
I think it's D but it's my (viewpoint)
An element has a shiny metallic appearance and is both ductile and malleable. In which section of the diagram would the element most likely be found?
A.
1.
B.
2.
C.
3
D.
4
Answer:
Section 2 on the diagram (Option B)
Explanation:
These metals can be shiny, ductile, malleable, and are good conductors of heat and electricity.
why plastic do not rust
Answer:
it can't rust simply because it doesn't contain any iron or any of it's alloys. In fact, not even all metals rust.
Explanation:
what state of matter of a substance depends on how the particles in that substance
Answer:
Solids is the answer hope this helps
How is particle motion related to thermal equilibrium?
Answer:
With billions of moving particles colliding into each other, an area of high energy will slowly transfer across the material until thermal equilibrium is reached (the temperature is the same across the material).
Predict which surface will melt ice faster. Wood or metal? Why?
Answer:
I believe wood wood melt it faster. Why, because of how compact it is. It would be warmer. Metal would be a cooler temperature.
Explanation:
All forms of energy can be ________into other forms of energy
a.transformed
b.energy transformation
c.transformations
d. conversation
e.thermal
f. kinetic and mechanicalscience
Answer:
A.
Explanation:
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Answer:
A. Is the correct answer.
Explanation:
It is correct because you would need to read the sentence over with all the choices you have. and transformed makes sense.
which terms are used to identify pure substance
Answer:
Physical properties of a substance are characteristics that can be observed without altering the identity of the substance. Color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.
Explanation:
Which are the basic physical sciences?
biology, paleontology, biochemistry and zoology
medicine, biotechnology, genetics and pharmacology
chemistry, physics, astronomy and earth science
Correct.
mathematics, statistics, logic and computer science
Answer:
Chemistry, physics, astronomy and earth science.
Explanation:
Explain.Car side mirrors do not work when they are convered with frost. What does frost do no the surface of a mirror to cause a diffuse reflection?
The side mirrors play an important role in providing the safety of a car and also help the drivers to see the vehicles behind the car. Most of the side mirrors have a small heating element in them which helps to defrost or deice.
When ice, snow or even just condensation builds up on your mirror, it can severely limit your visibility. The frost makes the smooth surface of the mirror rough, so that the parallel rays are reflected in different directions.
There are extensive and multiple refractions which cause the distortion of light and so that the frost looks white, whereas ice is clear also called black ice due to the colour of road surface.
To know more about refraction, visit;
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state one factor that effects the rate of change of the liquid colour
Answer:
Temperature is one of the major factors that affects the rate of change of the liquid colour, this is because ; like when if you freeze hot water the ice formed will be clear transparent, while on the other hand, if we freeze cold water it would be foggy inside the ice. This change occurs because of the temperature difference of the cold and hot water.
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Thank You!!
aluminium oxide has a very high melting point (2072 degrees C) while carbon dioxide has a very low boiling point (-57 degrees C). Explain this difference clearly.
Please help I don’t get what it’s asking!!!
Answer:
Well, Aluminum Oxide has a very high melting point. Carbon dioxide has a very low boiling point.
Explanation:
They are both talking about different things, melting and boiling. Aluminum Oxide's melting point is much higher then carbon dioxide's melting point. Hope this help, and good luck on your assignment (if one)
Which element below has atoms with only two valence electrons?
Potassium
Sulfur
Magnesium
Neon
(C.6a) An atom of a neutral element contains 16 electrons. What element is it?
Answer:
Sulfur
Explanation:
you find a 2cmsquared piece of pure gold with a mass of 38.6 g. what is it's density?
Answer:
First change cm in m and mass is 38.6g. Volume. =200m
Explanation:
Now,
Density =mass /volume
38.6/200
0.193 density
If the value of volume doubles but the mass stays
the same, the value for density will be
1.double
2.the same
3.halved
Answer:
halved
Explanation:
density decreases when volume increases if mass is kept constant density is defined as mass divided by volume.If the value of volume doubles, but the mass stays the same, the value for density will be halved. The correct option is 3.
What are volume, mass, and density?Density is the mass per unit volume. Density is a scalar quantity. It is denoted by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume.
Mass is the quantity of matter in a physical body. The product of the molar mass of the compound and the moles of the substance are defined as mass.
Volume is the space occupied by a three-dimensional object. Volume is calculated by dividing mass by density.
These three factors are related to each other. If two variables are given, the third can be calculated.
Thus, the correct option is 3. Halved.
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What does nm measure in the spectra?
Answer:
The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (0.000000001 m).
Answer: Nanometer
Explanation:
The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (0.000000001 m).
...
Nanometer
imperial/US units 3.2808×10−9 ft 3.9370×10−8 in
NEED ANSWER ASAP!! I would really aprecitate it! Please.
Explanation:
Positron..............
Where is chemistry used?
A. In all areas of life
B. Only in the food industry
C. Mostly in medicine
D. Mostly in manufacturing
Answer:
A
Explanation:
chemistry is used in all areas of life
Answer: A
Explanation:
just got it right
If you know the volume and the density of an iron rod, how would you calculate the mass of that iron rod? Show a formula.
Answer: for an example
volume can easily be calculated: pi*(d^2/4)*length -> pi*[(7x10^-2)/4]*70x10–2 = volume of iron rod {VOIR}
Density = mass / volume
Therefore
Mass = density x volume
However, weight is equals to ‘mass x g (free fall acceleration’
So mass is in kg but weight is a force so simple force equation to where ‘a (acceleration)’ in ‘F=ma’ is ‘g’.
Hence,
Weight = 9.81 ms^-2 (is ‘g’) x 7870 kgm^-3 x VOIR m^3 is *insert calculated answer* N.
Explanation:
9.Magnetization of iron is a physical change.
A true
B false
Answer:
This is true.
Explanation:
Magnetization of iron is a physical change and not a chemical change as there is no change of state, no change of temperature, no smell and no evolution of gas.
Why is the reactivity of metal increase but that of non-metal decreases as we go down in a group of periodic table? (pls its important i need this question's ans for my exam so answer it fast thank you)
Answer:
Nonmetal reactivity decreases down a group because the nucleus' ability to gain more valence electrons weakens due to more nuclear shielding. For Metals: the most reactive metals are those that can lose their valence electrons the most easily. ... Francium is the most reactive metal
Explanation:
Answer:
While moving from top to bottom in a group of the periodic table, the reactivity of non- metals decreases. ... Thus, the tendency of gaining electron/s in the valence shell decreases as well as the chemical reactivity also decreases on moving from top to bottom in a group of non- metals.
Draw the electric field lines between a proton and an electron. According to Coulomb's law, how would the electrical force between these particles change if the product of their electrical charge increased?
Explanation:
An electron has a negative charge and a proton is a positively charged particle. Electric field lines are used to express the direction of the electric field. For a positive charge, it is outwards while for a negative charge it is inwards. The attached figure shows the electric field lines between a proton and an electron. The field lines emerge from proton and terminate at electron.
The electrical force between charges is given by :
[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]
r is the distance between charges
The force is directly proportional to the product of charges. It means that if the product of electrical charge increased, it means that the electrical force will increase proportionally.