Answer:
2 curies
Explanation:
This is actually pretty easy to explain.
The Radium-226 which is an isotope of the radium, have an activity of curie. This is basically used in radioactivity of certain elements.
As in both cases we have Radium -226 and we are only varying the mass of the Radium, then, we can just do a rule of 3 to calculate this:
1 g Ra-226 --------> 1 Curie
2 g Ra-226 --------> X Curie
Solving for X:
X = 2 g * 1 Curie / 1 g
X = 2 Curies.You can also see this by taking 2 grams of Ra per separate. On one side you have 1 g of Ra-226 and on the other side, you have another 1 g of Ra-226. Both have 1 Cury of activity. If you put both on the same side, you will have 1 Cury of 1 isotope plus 1 cury of the other isotope, final result? 2 curies.
Hope this helps
Wich of these BEST shows a change from potential to kinetic energy?
Choices
A: A sandwich at lunch helps a students run a race.
B: Electricity making a bulb light up.
C: Transfer of heat trough electromagnetic waves.
D: A ball sitting at the top of the hill.
Example #1: 0.450 mole of Fe contains how many atoms?
Answer:
Number of Fe atoms = 2.709 × 10^23 atoms.
Explanation:
Given the following data;
Number of Fe moles = 0.450 mole
We know that Avogadro constant is equal to 6.02 * 10^23 mol¯¹
Number of Fe atoms = number of Fe moles * Avogadro constant
Substituting into the equation, we have;
Number of Fe atoms = 0.450 × 6.02 * 10^23
Number of Fe atoms = 2.71 × 10^23 atoms.
Note: Fe is the symbol for the chemical element Iron.
What is the volume occupied by 40 grams of argon gas (Ar) at standard conditions?
Answer:volume occupied by 40 grams of argon gas (Ar) at standard conditions = 22.443L
Explanation:
Using the ideal gas law that
PV =nRT
Where p =pressure,
V = volume,
n = number of moles
R = gas constant, and
T= temperature in Kelvin.
Since Argon is at STP( Standard conditions), This means that temperature is 273.15 K and pressure is 1 atm
Also the gas constant= 0.08206 L atm/K mol . we are using this value because its units match the units of our values to aid easy calculation
So,
Number of moles = Mass/ Molar mass
=40g/39.948 g/mol
Number of moles of Argon=1.0013moles.
Now Bringing
pV= nRT
V= nRT/p
=(1.0013mol x 0.08206 L atm/K mol x 273.15 K ) /1atm
Volume =22.443L
Why does my hand get cold when I pick up a snowball?
Answer:
Cause snow is cold.
Explanation:
THANK YOU
While the Bohr model fails to show the true shape of the electron orbitals with in an atom, it is still used because it ?
Answer:
Is used to predict the spectra of hydrogen and hydrogen like species
Explanation:
The Bohr's model of the atom was propounded by Neis Bohr. In his theory, an atom is composed of quantized energy levels in which electrons may be found.
The transition of an electron between energy levels leads to the absorption or emission of energy in the form of a photon of visible light. The energy absorbed or emitted depends on the energy difference between the two energy levels.
The model is successful at predicting the electronic spectra of one electron species but totally fails when the specie has more than one electron. Also, the model fails to show the true shape of the electron orbitals within an atom.
Iron+calcium oxide=?
Answer:
Calcium iron oxide (CaFe2O4)
PubChem CID 6336546
Molecular Formula CaFe2H8O4
Synonyms Calcium iron oxide (CaFe2O4) 12013-33-1 Calcium ferrite EINECS 234-584-5
Molecular Weight 223.83 g/mol
Component Compounds CID 23925 (Fe) CID 5460341 (Calcium) CID 962 (Water)
4. Calculate the number of carbon (C) atoms present in the 25 mL of sugar.
Show all your workings
*
Answer: [tex]8.38\times 10^{23}atoms[/tex] of carbon
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
mass of sugar= [tex]density\times volume=1.59g/ml\times 25ml=39.75g[/tex]
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{39.75g}{342.3g/mol}=0.116moles[/tex]
1 mole of sugar [tex]C_{12}H_{22}O_{11})[/tex] contains = [tex]12\times 6.023\times 10^{23}=72.28\times 10^{23}atoms[/tex] of carbon
0.116 mole of sugar [tex]C_{12}H_{22}O_{11})[/tex] contains = [tex]\frac{72.28\times 10^{23}}{1}\times 0.116=8.38\times 10^{23}atoms[/tex] of carbon
Help asap please!!!!
will give brainliest
Answer:
24.5°C
Explanation:
im so sorry if i got it wrong but u dont gotta mark me as brainliest cuz im dum:(
there's 4.1*10^25 particles of calcium phosphate, how many grams of calcium phosphate is that
Mass of Calcium phosphate : = 21127.7 g
Further explanationGiven
4.1 x 10²⁵ particles of Calcium phosphate
Required
mass
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
mol Calcium phosphate :
n = N : No
n = 4.1 x 10²⁵ : 6.02 x 10²³
n = 68.11
mass Calcium phosphate Ca3(PO4)2 :
= mol x MW
= 68.11 x 310.2 g/mol
= 21127.7 g
= 21.13 kg
What is the relationship between molecular motion and energy?
Answer:
Because the particles are in motion, they will have kinetic energy. The particles will not all have the same energy, and the energy of the particles is constantly changing as they undergo changes in speed. Thus, for a given sample of matter, we can only talk about the average kinetic energy of the particles.
Explanation:
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We do know that if we "give" energy to a given object, the temperature of the object increases.
So there is a direct relationship between temperature and energy.
From this idea, we can conclude that:
"As we increase the energy, we also will see an increase in molecular motion."
We also do know that, as the temperature of an object increases, also does the kinetic energy of the particles that conform to the object (as the kinetic energy increases, the particles move more, this is why as we increase the temperature we usually see an increase in the volume of the object).
This increase in kinetic energy is related to the molecular motion (the movement of the electrons and nucleus o a molecule) as the kinetic energy of these parts increase, these move more.
So the relationship between molecular motion and energy is:
As we increase the energy, we also will see an increase in molecular motion.
If you want to learn more, you can read:
https://brainly.com/question/12280673
Which of the following organisms is reproduced by regeneration?
A.birds
B.squid
C.sponge
D.starfish
C-14 has a half life of 5730 years, an artifact gives 4 counts per minute on a detector, living matter gives a count of 32. What is the estimated age of the artifact?
Answer:
17188 years
Explanation:
Given that;
0.693/t1/2 = 2.303/t log (Ao/A)
Where;
t1/2 = half life of carbon -14
t = time taken
Ao = activity of a living sample
A activity of the artifact
0.693/5730 = 2.303/t log (32/4)
1.21 * 10^-4 = 2.303/t * 0.9031
1.21 * 10^-4 = 2.0798/t
t = 2.0798/1.21 * 10^-4
t = 17188 years
Help plzzz I’ll give brainliest
Answer:
last one
Explanation:
Answer:
full moon
hope this helps
Select the correct answer.
In this reaction, what effect does a change in the concentration of substances have on the reverse reaction rate?
CaCO3(s) ⇌ CaO(g) + CO2(g)
A.
The rate of the reverse reaction increases with an increase in the concentration of CaCO3(s).
B.
The rate of the reverse reaction increases with an increase in the concentration of CaO(g) and CO2(g).
C.
The rate of the reverse reaction decreases with a decrease in the concentration of CaCO3(s).
D.
The rate of the reverse reaction decreases with an increase in the concentration of CaO(g) and CO2(g).
E.
The rate of the reverse reaction increases with a decrease in the concentration of CaO(g) and CO2(g).
Answer:
A. The rate of the reverse reaction increases with an increase in the concentration of CaCO3(s)
Explanation:
If the concentration of a reactant has increased, The substance will shift in the direction of the reaction that uses the reactants, So that the Reactants substance Increases.
The following chemical reaction takes place in aqueous solution:
Mg(NO3)2(aq)+2 NaOH(aq) --Mg (OH)2(3)+2 NaNO3(aq)
Write the net ionic equation for this reaction.
Answer:
[tex]Mg^{2+}+2OH^{-}=>Mg(OH)2[/tex]
Explanation:
The diagram below illustrates changes over time in a population of foxes in the wild,
X
What process is illustrated in the diagram?
extinction
overproduction
O natural selection
O artificial selection
Answer:
natural selection
Explanation:
what special requirements would a helicopter rotor need to have in order to make a helicopter flight possible on the red planet.
Answer:
Explanation:
may u explain what u mean then i will be able to help u because i like knows this but what u mean will be better so i can tell u the right answer thanks have a good day
why is productivity greatest near the ocean's surface?
Answer:
Sunlight penetrates the top layers of the ocean, so photosynthesis occurs there. ... Upwelling brings nutrients to the surface.
Call this number 972-436-3577
Answer:
Dominos prank call hahahaha
Answer:
why
Explanation:
PLEASE HELP TEST
does anyone know the answer???? density question
Answer:
The answer is honey.
Explanation:
Answer: alcohol
Explanation:
What does a secondary consumer eat? Immersive Reader
Answer:
primary consumers and sometimes plants
Hydrogen gas reacts with oxygen gas to produce water. How many moles of
hydrogen do you need to get 120 grams
of water?
Answer:Two
Explanation:
Leila made herself a cup of hot chololate weighing 150 grams. If she started with 125 grams of milk, how many grams of hot chocolate mix did she add?
Answer:
150g-125g
=25 of hot chocolate mix
What is the practical application of melting point in the study of matter?
Answer:
Melting points are often used to characterize organic and inorganic crystalline compounds and to ascertain their purity. Pure substances melt at a sharp, highly-defined temperature (very small temperature range of 0.5 – 1 °C) whereas impure, contaminated substances generally exhibit a large melting interval.
Explanation:
I hoped this helps a bit! ^^
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Plants can provide the materials that animals use in cellular respiration, and animals can provide some of the materials that plants use for photosynthesis. The image below shows the relationship between photosynthesis and cellular respiration. According to the diagram, how does cellular respiration aid the process of photosynthesis?
It produces ATP.
It produces glucose.
It produces mitochondria.
It produces carbon dioxide
Answer:
it produce atp
Explanation:
.............
Cellular respiration is a metabolic process that occurs in the cells of an organism. Carbon dioxide from cellular respiration aids the process of photosynthesis.
What are cellular respiration and photosynthesis?Cellular respiration is a process that takes place in the organism's cell where the cellular oxygen or chemical energy gets utilized and converted to ATP and waste like carbon dioxide.
The carbon dioxide released by the organism in the atmosphere is used by plants in the process of photosynthesis. Photosynthesis is a process that utilizes carbon and water to form glucose and oxygen.
Therefore, cellular respiration supports the process of photosynthesis by option D. producing carbon dioxide.
Learn more about cellular respiration and photosynthesis here:
https://brainly.com/question/18812151
i gave brainlest.... the answer is correct!!!
1.Oort Cloud
2.Uranus Earth and Mars
3.Kuiper Belt
4.Asteroid Belt
Please help me with this homework
Answer:
dude
Explanation:
dude use a calculator, \ USE A CALCULATOR
Which of the following is a nonelectrolyte?
HCI
Rb2SO4
CH3CH2OH
KOH
NaCl
is CdCi2 covalent or ionic
Answer:
binary and 11
Explanation:
CaCl2 or Calcium Chloride is an ionic bond and not a covalent bond. Since there should be sharing of electrons between two atoms to be a covalent bonding. In case of calcium chloride, the calcium gives up an electron to each chlorine atom, becoming Ca2+ ions and chlorine become Cl– ions.
:)
Explain how the transfer of heat causes air to rise?
plzzzzzz help mee
also friction is not the answer
Answer:
Air in the atmosphere acts as a fluid. The sun's radiation strikes the ground, thus warming the rocks. As the rock's temperature rises due to conduction, heat energy is released into the atmosphere, forming a bubble of air which is warmer than the surrounding air. This bubble of air rises into the atmosphere.
Explanation:
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