Answer:
5.75 g.
Explanation:
It is known that the decay of isotopes of Pb-189 obeys first order kinetics. Also, it is clear that in first order decay the half-life time is independent of the initial concentration. The half life time of Pb-189 decay = 20 days.Thus, 60 hours represent (60/20) 3 half-lives.∴ 46 g →(first half-life) 23 g →(second half-life) 11.5 g →(third half-life) 5.75 g.
So, The amount remained is 5.75 g after 3 half-lives (60 days).
The most unusual characteristic of Uranus is _____.
its green color
the icy cold temperature
the axis tilted at 98°
the methane atmosphere
Answer:
the axis is tilted at 98 degrees
Explanation:
Uranus is blue, not green; it has an atmosphere of hydrogen and helium, not methane. While it does have an icy cold temperature, that's not a very unusual characteristic for an outer planet. However, the tilt of the axis is unusual; no other planet is tilted almost completely on its side!
A chemical property is a change in
Density
Physical state
Composition of matter
Hardness
I believe it would be either the Density or the composition of its matter
It is the composition of matter
A person who has a mass of 60kg run up a flight of stairs 12m high in 20 seconds What is the weight of the person
132 pounds. As you stated, their weight is 60 kg and 60 kg = 132.77 pounds
The universal force that exists detween any objects with mass is called?
Answer:
Gravity
Everything with mass has gravity
In the reaction 2NaCl + 2H2O → 2NaOH + C12 + H2, the reactants should:
weigh more than the products because the reaction isn't perfect.
weigh less than the products because mass is lost.
weigh the same as the products.
weigh more because Cl2 and H2 are gases.
Answer:
D
Explanation:
Tough question. Both Cl2 and H2 are gases. Everything depends on what the water is. If it's a liquid, then D is the answer. If it's a gas, then you have to be a little more careful.
2H2O = 2 * 18 = 36.
Cl2 = 2*Cl = 2 * 35.5
Cl2 = 71
So D is still the answer.
Answer: weigh the same as the products.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
[tex]2NaCl+2H_2O\rightarrow 2NaOH+Cl_2+H_2[/tex]
Given:
Mass of products = Mass of sodium hydroxide + mass of chlorine + mass of hydrogen = 2(40)+1(71)+2(1)= 153 g
Mass of reactants = Mass of sodium chloride + mass of water = 2(58.5)++2(18)= 153 g
Thus the total mass of reactants is equal to the total mass of products.
Explain the difference between ecosystem, community, and population.
Out of the three you gave ecosystem is what I would call the most broad. An ecosystem includes living AND non-living things in an area
Community is all the LIVING things in an area (plants are included and I think bacteria is too, but I'm not sure)
Population is pretty narrow it just looks at specific species in one area. Population of mosquitoes doesn't include butterflies, if only looks at mosquitoes
Hope this helped!
6. 100 ml of gaseous hydrocarbon consumes 300
ml of oxygen for the complete combustion.
The hydrocarbon is
[MOE 2060]
a. C2H4
b. C2H2
с. С3Н8
d. C2H6
Answer:
a. C₂H₄Explanation:
At constant pressure and temperature, the mole ratio of the gases is equal to their volume ratio (a consequence of Avogadro's law).
Hence, the complete combustion reaction that has a ratio of 100 ml of gaseous hydrocarbon to 300 ml of oxygen, is that whose mole ratio is 1 mol hydrocarbon : 3 mol of oxygen.
Then, you must write the balanced chemical equations for the complete combustion of the four hydrocarbons in the list of choices, and conclude which has such mole ratio (1 mol hydrocarbon : 3 mol oxygen).
A complete combustion reaction of a hydrocarbon is the reaction with oxygen that produces CO₂ and H₂O, along with the release of heat and light.
a. C₂H₄:
C₂H₄ (g) + 3O₂ (g) → 2CO₂(g) + 2H₂O (g)Precisely, for this reaction the mole ratio is 1 mol C₂H₄: 2 mol O₂, hence, this is the right choice.
The following analysis just shows that the other options are not right.
b. C₂H₂:
2C₂H₂ (g) + 5O₂ (g) → 4CO₂(g) + 2H₂O (g)The mole ratio for this reaction is 2 mol C₂H₂ :5 mol O₂.
с. С₃Н₈
C₃H₈ (g) + 5O₂ (g) → 3CO₂(g) + 4H₂O (g)The mole ratio is 1 mol C₃H₈ : 5 mol O₂
d. C₂H₆
2C₂H₆ (g) +7 O₂ (g) → 4CO₂(g) + 6H₂O (g)The mole ratio is 2 mol C₂H₆ : 7 mol O₂
What are Isotopes ?....
Atoms that have different numbers of neutrons than protons and electrons are called isotopes.
Isotopes are atoms of the same element so they have the same number of protons. But, they have different mass numbers which means they have a different number of neutrons.
Giving brainliest to correct answer!
What kind of energy does hot water have?
Answer: Thermal Energy
Explanation:
Answer:
Hot water has kinetic energy
Explanation:
That is an energy that involves movement. Kinetic energy water causes flows and make waves exist
What do all ions have in common in terms of their electrical structure?????
Answer:
The ratio between protons to electrons is not 1:1
Explanation:
A normal atom will be neutral in charge having 1 electron for each atom. An Atom that gains or looses an electron loses that perfect ratio. It is positive is electrons are loss and negative if electrons are gained.
HELP NOW!!Why is it important to classify living organisms?
Answer:
C. Scientists may study and discuss organisms easily
what happens to the atomic number of an atom as you go across a period of the periodic table from left to right
Answer:
[tex]\boxed{\text{The atomic number increases}}[/tex]
Explanation:
That's because each time you move one atom to the right, you add a proton to the nucleus, and the atomic number is the number of protons in the nucleus.
How do I find the molar mass of Copper (II) Nitrate?
Answer:
The molar mass of copper (II) nitrate is 187.5 g/mol.
Explanation:
The molar mass is the mass of all the atoms in a molecule in grams per mole. To calculate the molar mass of a molecule, we first obtain the atomic weights from the individual elements in a periodic table. We then count the number of atoms and multiply it by the individual atomic masses.
Convert 6.33×10−6 cg to nanograms.
what is enthalpy? ?????????????????????????
A thermodynamic quantity equivalent to the total heat content of a system
Answer:
a thermodynamic quantity to the total heat content of a system. it is equal to the internal energy of the system plus the product of pressure and volume. it is associated with a particular chemical process
Explanation:
i just looked up the definition.
According to the Arrhenius definitions of acids and bases, choose the bases from the list of acids and bases. Check all that apply.
Ba(OH)2
HIO3
H2CO3
CsOH
Answer:
to make it more simple its A and D
Explanation:
edge
Arrhenius bases are the species that release hydroxide ions in the solution. Barium hydroxide and Caesium hydroxide are examples of Arrhenius bases.
What are Arrhenius's bases?Arrhenius bases are the chemical compounds that increase the concentration of the hydroxide ion in a solution when gets ionized. Whereas the acids release hydrogen ions when dissolved in water.
Barium hydroxide and Caesium hydroxide are the chemical species when dissolved in water will completely dissociate to release hydroxide ions and are the strong bases.
Therefore, option A. barium hydroxide and option D. cesium hydroxide are Arrhenius bases.
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whats the name of S4O6
Answer:
Sulfonic acid
Explanation:
I think this is correct
The name of the chemical formula [tex]S_4O_6[/tex] is tetrathionate.
What is [tex]S_4O_6[/tex]?The tetrathionate anion is sulfur that is produced by tetrathionic acid.
The ion has two sulfur atoms in oxidation state 0 and two sulfur atoms in oxidation state +5.
The structure of tetrathionate can be seen by following three corners of a cube.
Thus, Tetrathionate is the name of [tex]S_4O_6[/tex].
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Which type of decay has the greatest mass?
A.
alpha
B. beta
gamma
D.
nuclear
Answer:
Alpha has the greatest mass- A.
Answer: The correct answer is Option A.
Explanation:
For the given options:
Option 1: AlphaAlpha decay is defined as the process in which alpha particle is emitted. In this process, a heavier nuclei decays into a lighter nuclei. The alpha particle released carries a mass of 4 units.
[tex]_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\alpha[/tex]
Option 2: BetaBeta decay is defined as the process in which beta particle is emitted. In this process, a neutron gets converted to a proton and an electron. The beta particle does not have any mass.
[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{Y}+_{-1}^0\beta[/tex]
Option 3: GammaGamma decay is defined as the process in which an unstable nuclei gives off excess energy by a spontaneous electromagnetic process and thus releases [tex]\gamma -radiations[/tex]. These radiations does not have any mass.
[tex]_Z^A\textrm{X}^*\rightarrow _Z^A\textrm{X}+_0^0\gamma[/tex]
Option D: NuclearNuclear reactions are defined as the reactions in which change of nucleus takes place.
Hence, the correct answer is Option A.
which element was first discovered on the sun?
the element first discovered in the sun is the element Helium. This noble gas is the second most abundant element in the universe and was discovered on the sun before it was discovered on the earth.
hope this helps :)
How many grams of potassium chloride are there in 1445.71 mL of 2.47 M KCI?
Answer:
266.2 g.
Explanation:
Molarity is the no. of moles of solute per 1.0 L of the solution.M = (no. of moles of KCl)/(Volume of the solution (L))
M = 2.47 M.
no. of moles of KCl = ??? mol,
Volume of the solution = 1445.71 mL = 1.44571 L.
∴ (2.47 M) = (no. of moles of KCl)/(1.44571 L)
∴ (no. of moles of KCl) = (2.47 M)*(1.44571 L) = 3.571 mol.
To find the mass of KCl, we can use the relation:no. of moles of KCl = mass/molar mass
∴ mass of KCl = (no. of moles of KCl)*(molar mass) = (3.571 mol)*(74.55 g/mol) = 266.2 g.
blank may be rinsed over materials to wash off explosive residue
Acetone may be rinsed over materials to wash off explosive residue.
How rinsed over materials to wash off explosive residue?The real solution to the residue issue is to use methods that actually rinse away cleaner.
Some solvents and steam vapor systems are examples of residue-free chemistry. Completely water soluble and rinseable, soap-free products for carpet and hard floor care are a valuable part of the professional cleaner’s arsenal of residue-free cleaners.
In clean areas, all exposed surfaces should be smooth, impervious and unbroken in order to minimize the shedding or accumulation of particles or microorganisms and to permit the repeated application of cleaning agents, and disinfectants where used.
Acetone may be rinsed over materials to wash off the explosive residue. This can then be analyzed by x-ray techniques. Advance in explosives that has been proposed. Use of small color chips. These chips would be added to explosive materials available to the public.
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How much force is required to lift a rock a vertical distance of 8 m if 80 j of work were done
Answer:-
Try this formula:
W= Fd
F = W by d
Explanation:-
(Note: A newton-meter is the same thing as a joule, so the units for work are the same as those for energy – joules).
The force required to lift a rock at a vertical distance of 8 m if 80 j of work were done is 10 N.
What is force?A force is an effect that can alter an object's motion. Due to force, an object with mass can change its velocity, or accelerate.
Given,
Distance is 8 m
work done is 80 j
Now by the formula of work
[tex]\bold{Work = force \times distance}[/tex]
[tex]80= F\times 8\\\\F= \dfrac{80}{8} = 10 N[/tex]
Thus, the force required is 10 N.
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HELP ASAP! GIVING BRAINLIEST!!
How could you give a pendulum more energy?
Answer: By pushing it.
Explanation: If you push the pendulum, the energy from your hand to the pendulum will be transferred thus giving the pendulum more energy.
The ions Ca2+ and PO43- form salt with the formula
Ca3(PO4)2 is the answer.
Answer : The formula for the compound is [tex]Ca_3(PO_4)_2[/tex]
Explanation :
For formation of a neutral ionic compound, the charges on cation and anion must be balanced.
The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non-metals.
In the given question, the calcium metal forms an ionic compound with polyatomic anion (phosphate) [tex]PO_4^{3-}[/tex].
Here, calcium is having an oxidation state of +2 called as [tex]Ca^{2+}[/tex] cation and phosphate [tex]PO_4^{3-}[/tex] is an anion with oxidation state of -3. The charges are not balanced. So, the charges are balanced by the cris-cross method. Thus, the compound formed will be, [tex]Ca_3(PO_4)_2[/tex]
Hence, the formula for the compound is [tex]Ca_3(PO_4)_2[/tex]
what is responsible for the intense heat and pressure in the sun's core?
Answer:
Nuclear Fusion
Explanation:
This creates heat and protons that can heat up the sun
The core is composed of hot, dense plasma. The process nuclear fusion is responsible for the intense heat and pressure in the sun's core.
What is nuclear fusion?The process in which two lighter nuclei fuse together to form a heavier nucleus with the simultaneous release of a huge amount of energy is defined as the nuclear fusion.
Some mass is always lost during this process and this is converted into energy in accordance with Einstein's equation, E = mc². This huge amount of energy is released.
The fusion reactions are common in the interior of stars. The energy of our sun is believed to arise from a number of complex fusion steps. The net reaction is:
4 (₁¹H) → ₂⁴He + 2 (₊₁⁰e) + energy
During nuclear fusion in the core photons and neutrinos are released. These particles carry and emit the light, heat and energy of the sun.
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ii. Use the solubility table to label the state symbols of each compound in the reaction. (1 point) AgNO3 + KCL = AgCl + KNO3
Answer:
AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃ (aq)Explanation:
In a solubility table you find:
AgNO₃ (silver nitrate) is highly solubleKCl (potassium chloride) is solubleAgCl (silver chloride) is insolubleKNO₃ (potassium nitrate) is solubleIn a chemical equation the states of soluble compounds is identified as aqeous, using the letter "aq" in parenthesis, and the state of insoluble compounds is identified as solid, using "s" in parenthesis.
Then, the reaction showing the states of the reactants and products is:
AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃ (aq)In the chemical reaction AgNO3 + KCl = AgCl + KNO3, the state symbols for each compound are provided - AgNO3 (aq), KCl (aq), AgCl (s), and KNO3 (aq).
The state symbols for each compound in the reaction AgNO3 + KCl = AgCl + KNO3 are:
AgNO3 (aq) - Silver nitrate is soluble in water.KCl (aq) - Potassium chloride is soluble in water.AgCl (s) - Silver chloride is insoluble and will precipitate out of the solution.KNO3 (aq) - Potassium nitrate is soluble in water.How many grams of phosphorus are in 500.0 grams of calcium phosphide? (i need the work also)
Final answer:
To find the grams of phosphorus in 500.0 grams of calcium phosphide, the molar mass of calcium phosphide is calculated, followed by the number of moles in the sample. The mole ratio then gives the moles of phosphorus, which is finally converted to grams, resulting in approximately 169.35 grams of phosphorus.
Explanation:
To determine the number of grams of phosphorus in 500.0 grams of calcium phosphide, we need to follow these steps:
Find the molecular formula of calcium phosphide which is Ca₃P₂.Calculate the molar mass of Ca₃P₂ by adding the molar masses of all the atoms present in the formula. The molar mass of calcium (Ca) is 40.08 g/mol and the molar mass of phosphorus (P) is 30.97 g/mol, therefore:Therefore, there are approximately 169.35 grams of phosphorus in 500.0 grams of calcium phosphide.
On the periodic table, elements are arranged according to their mass numbers. TrueFalse
Explanation:
FALSE
ITS NOT ALWAYS NECESSARY TO BE IN AN ORDER
Why does warm soda go flat faster than chilled soda?
Hello There!
The moloques are moving faster in warm soda, so the carbonation leaves the soda faster.
Answer:
Same as what BlueFox stated above EXCEPT it is gas molecules move faster in warm soda
Explanation:
making fun of his typo,,,
___solutions are good conductors of electricity.
lonic
Covalent
Heterogeneous
Gaseous
The answer is ionic
Answer: Option (a) is the correct answer.
Explanation:
A bond where transfer of electrons take place from one atom to another is known as an ionic bond.
An ionic solution is defined as a solution in which an ionic compound is dissociated into ions.
For example, NaCl is an ionic compound and when it is dissolved in water it dissociates as [tex]Na^{+}[/tex] and [tex]Cl^{-}[/tex] ions.
As it is known that electric current is the flow of charges. Hence, a solution that contains ions will be a good conductor of electricity.
Whereas in general, a covalent solution does not contain any ions.
Thus, we can conclude that ionic solutions are good conductors of electricity.