Curicun, named for marie curie, has approximately 25 different isotopes that emit an alpha particle when their nuclei decay. If curium-247, the most abundant nuclide, emit and alpha particle, what daughter nuclide is formed?
Answer: The daughter nuclide formed is Plutonium -243
Explanation:
Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.
[tex]^A_Z\textrm{X}\rightarrow ^{A-4}_{Z-2}\textrm{Y}+^4_2{\alpha}[/tex]
where A - mass number
Z - atomic number
X and Y are symbols of elements
For alpha decay of curium-247,
[tex]^{247}_{96}\textrm{Cm}\rightarrow ^{243}_{94}\textrm{Pu}+^4_2{\alpha}[/tex]
The daughter nuclide formed is Plutonium -243
How many meters did a car travel if it went 65mi/hr for 4.5 hours?
Answer:
292.5
Explanation:
65x4=260
65 divded by 2 = 32.5
260+32.5=292.5
Calculate the pH of a solution with [H+]= 1 x 10^-11
11
3
13
14
Answer: Option (a) is the correct answer.
Explanation:
pH is the negative logarithm of concentration of hydrogen ion.
That is, pH = -log [tex][H^+][/tex]
Hence, pH of solution with [tex][H^+] = 1 \times 10^{-11}[/tex] is calculated as follows.
pH = -log [tex][H^+][/tex]
= -log [tex](1 \times 10^-{11})[/tex]
= 11
Therefore, pH of solution with [tex][H^+] = 1 \times 10^{-11}[/tex] is 11.
Ammonium chloride + Potassium hydroxide - Potassium
chloride + Ammonia gas + Water
Which of the following chemical reactions correctly interprets
the chemical word equation above?
а) KCl (aq) + NH3(g) + H20 (1) ► NH4Cl (aq) + KOH (aq)
b) NH4Cl (aq) → KCl (aq) + NH3(g) + H2O (1)
c) NH3 (g) + KOH (aq) → NH3(g) + H20 (1)
d) NH4Cl (aq) + KOH (aq) → KCl (aq) + NH3(g) + H20 (1)
Answer:
d) NH4Cl (aq) + KOH (aq) → KCl (aq) + NH3(g) + H20 (1)
Explanation:
The formula for Amonnium Chloride is NH4Cl.
The formula for Pottasium Hydroxide is KOH.
The formula for Pottasium Chloride of KCL.
The formula for Ammonia gas is NH3.
And as everyone knows the formula of water is H20.
Hope this helps :)
A balanced chemical equation obey the law of conservation of mass. According to this law, the mass can neither be created nor be destroyed. Here NH₄Cl (aq) + KOH (aq) → KCl (aq) + NH₃(g) + H₂0 (1) the correct equation. The correct option is D.
What is a balanced chemical equation?A chemical equation in which the number of atoms of reactants and products are equal on both sides of the equation is defined as the balanced chemical equation. The numbers which are used to balance the chemical equation are called coefficients.
The substances which appear on the left hand side of the equation are called the reactants whereas the substances that appear on the right hand side of the equation are called the products.
The reaction between Ammonium chloride and Potassium hydroxide is given as:
NH₄Cl (aq) + KOH (aq) → KCl (aq) + NH₃(g) + H₂0 (1)
Thus the correct option is D.
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Which of the following statements describes what happens as you rub your
hands together?
A. Matter is transferred from one hand to the other.
B. Kinetic energy is converted to heat energy.
C. Perfectly efficient energy transfer occurs.
a
D. Perpetual motion begins.
The statement that describes what happens as you rub your hands together is Kinetic energy is converted to heat energy. The correct option is B.
What is kinetic energy?Kinetic energy is the energy that is used when doing some work. It is possessed when an object is in motion. To move a body from its resting position to its motion position, kinetic energy is used. When a certain object moves with a certain speed, then it is maintaining its kinetic energy.
When someone is rubbing his hands, it means his hands are in motion, so kinetic energy is in use. Rubbing produced friction which produces heat, so the rubbing hands will convert the kinetic energy into heat energy.
Thus, the correct option is B. Kinetic energy is converted to heat energy.
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In Rutherford's Gold foil experiment, were the alpha particles directed to different areas of the gold foil or only the same spot? If the same spot, how did the particles get deflected in different directions sometimes and go through most of the time
Answer:
See explanation
Explanation:
In the Rutherford experiment, alpha particles were directed at the same spot on a thin gold foil.
As the alpha particles hit the foil, most of the alpha particles went through the foil. In Rutherford's interpretation, most of the particles went through because the atom consisted largely of empty space.
However, some of the alpha particles were deflected through large angles, in Rutherford's interpretation, the deflected alpha particles had hit the dense positive core of the atom which he called the nucleus.
This accounted for their scattering through large angles throughout the foil in all directions.
The combustion reaction for methane is shown below:
CH4 (9) + 2O2 (g) → CO2 (g) + 2H20 (9) + energy
If 64.0 g of methane is reacted with excess oxygen gas, what is
the pressure exerted by water vapor assuming the reaction
went to completion in a 24.0 L engine at 515 K?
Answer:
P = 14.1 atm
Explanation:
Given data:
Mass of methane = 64 g
pressure exerted by water vapors = ?
Volume of engine = 24.0 L
Temperature = 515 K
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O + energy
Number of moles of methane:
Number of moles = mass / molar mass
number of moles = 64 g/ 16 g/mol
Number of moles = 4 mol
Now we will compare the moles of water vapors and methane.
CH₄ : H₂O
1 : 2
4 : 2/1×4 = 8 mol
Pressure of water vapors:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
P = 8 mol × 0.0821 atm.L/mol.K× 515 K / 24.0 L
P = 338.25 atm.L/ / 24.0 L
P = 14.1 atm
10. Which best describes the purpose of food?
A
to kill bacteria
s. to prevent disease
c. to eliminate waste materials
o. to provide fuel for cell processes
Answer:
10. Which best describes the purpose of food? to kill bacteria
. to prevent disease
why are there so many producers in the first level of consumers
Answer:
The organisms that eat the producers are the primary consumers. They tend to be small in size and there are many of them. ... Because of this inefficiency, there is only enough food for a few top level consumers, but there is lots of food for herbivores lower down on the food chain.
Explanation:
What was the great physical event that took place at the end of the Mesozoic era in
North America?
Rocky Mountains formed.
First oceans formed
O Mount Saint Helens erupted.
Grand Canyon formed.
Answer:
Mount Saint Helens erupted
Will give brainliest! What is the balanced equation for Mg+O2?
I got:
Mg+O2 -> MgO2
2Mg+O2 -> 2MGO
Both may or may not be right so if its neither please put the correct answer. Thanks!
Answer:
2Mg+O2 = 2MgO is the balanced equation of this reaction. When Mg +O2 reacts MgO is formed. The number of atoms of each element on reactant and product side must be equal
Explanation:
Ur welcome
Answer:
2Mg+O2 ⇒ 2MgO
Chemical reactions yield ____
a) Products
b) Reagents
c) Reactants
d) All of the above
Answer:
products
Explanation:
chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.
Balance this chemical equation
Answer:
the chemical equation is balanced ❤
Urgent!! Can anyone please help me with this?
What is the molarity of an NaCl solution if 0.30 moles of salt are dissolved in 200.0 milliliters of water?
Answer:
Molarity = 1.5 M
Explanation:
Given data:
Molarity of solution = ?
Number of moles of NaCl = 0.30 mol
Volume of water = 200 mL (200/1000 = 0.2 L)
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Molarity = 0.30 mol / 0.2 L
Molarity = 1.5 M
Select the answer that lists the radiation waves in order of increasing
energy.
A. Gamma rays, Infrared, Radio waves
B. Radio waves, X-rays, Ultraviolet
C. Visible light, Infrared, X-rays
D. Microwaves, Ultraviolet, X rays
A student adds a 3.0 g antacid tablet to 35.0 g of water in a bottle. After the reaction is complete, 37.3 g of liquid remains in the bottle.
How much gas was formed in the reaction?
A. 0.7 g
B. 2.3 g
C. 3.0 g
D. 75.3 g
Answer:
A. 0.7 g
Explanation:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
antacid + water → liquid + gas
3.0 g + 35.0 g = 37.3 g + x
38.0 g = 37.3 + x
x = 38.0 g - 37.3 g
x = 0.7 g
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
A relationship where one organism benefits and the other organism is harmed is called?
Answer:
Parasitism. A symbiotic relationship between two species in which one benefits and the other is harmed.
Explanation:
:)
What involves a metal and nonmetal ionic or covalent bond
Answer:
An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.
if a rock had a mass of 20g explain how you would fund the density
Answer:
you have to divide it
Explanation:
Answer:
whats the volume u can't find the density without dividing the mass by the volume
5
0 2
This question is about salts and electrolysis.
Do not write
outside the
box
A student wants to make copper chloride crystals.
The student adds excess copper oxide to some hot acid.
The student stirs the mixture.
0 2 . 1
Which acid should the student use?
[1 mark]
Tick (✓) one box
Hydrochloric acid
Nitric acid
Sulfuric acid
Explanation:
In order to produce CuCl2 crystals, there have to be copper and chlorine atoms.
Copper oxide (CuO) has copper atoms. We need the acid to have chlorine atoms.
Out of HCl, HNO3 and H2SO4, only HCl has chlorine atoms.
CuO + 2HCl => CuCl2 + H2O.
Hence the answer is Hydrochloric acid.
You have 50 L of CO2 gas at standard temperature and pressure (STP). What would need to be done to the pressure to cut the volume of gas in half?
Answer:
what is this
Explanation:
Answer:
we have to double the pressure.
Explanation:
b/c according to boyle's" the volume of a given mass of gas is inversely proportional to its pressure in a constant temperature.
P1*V1=P2*V2
we have P1=1 atm because it is at STp
V1=50L
V2=25L because we want to cut the volume of the gas in half .
and we can find P2
from the above formula we have P2=P1*V1/V2
P2=1*50/25=50/25=2
so when we doubled the pressure the volume will be halved.
A sample of radium-226 will decay to ¼ of its original amount after 3200 years. What is the half-life of radium-226? _______years
Answer:
t(half-life) = 1600 yrs
Explanation:
All radio decay follows 1st order kinetics and therefore can be applied to the expression A = A₀e^(-kt)
A = current activity
A₀ = initial activity
k = decay constant
t = time of decay
Half-Life = 0.693/k
k = ln(A/A₀) / -t = ln(0.25) / -3200yrs = 4.33x 10⁻⁴ yrs⁻¹
Half-Life => t(1/2) = (0.693/4.33 x 10⁻⁴)yrs⁻¹ = 1600 yrs.
In your own words, explain why we have seasons on Earth. Why do some places have all 4 seasons and others seem to only have 1 or 2?
why is the electronic stucture written as 1s 2s 2p 3s 3p 4s. ... ? Shell number 3 can be filled 18 electrons but why isn't 3s 3p 3d written?
Answer:
Explanation:
The notations for electronic structure of the atom is based upon the application of quantum numbers which specifies the order of filling of atomic orbitals by electrons. There are 4 quantum numbers that include...
Principle QN (n) => specifies location of electron as to major energy level or, ring about the atom of interest.
Orbital QN (l) => specifies the shape of the orbital containing the electron
s => sphere => holds 2 electrons
p => figure eight => holds up to 6 electrons
d => overlapping figure eights => holds up to 10 electrons
f => multiple overlapping figure eights => holds up to 14 electrons
The order of filling follows the Aufbau Principle that electrons enter the atomic orbital with the lowest available energy content. This order of filling from low energy to higher energies follows the Aufbau Diagram.
This order theoretically can go to infinity, but the scientific community only knows of 7 major energy levels; i.e., the 7 rows of the periodic table. See attached Aufbau diagram and follow the arrows in order from low energy to high energy. Use superscripts for number of electrons equal to atomic number of element of interest.
H: 1s¹
O: 1s²2s²2p⁴
Al: 1s²2s²2p⁶3s²3p³
Ag: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d⁹
Check all the things that are true both of single celled organisms and
cells that are part of a multi-celled organism.
a grow
b. reproduce
c. use energy
d. get their own food
e. produce waste
need this answer asap !!
Answer:
a. Grow
b. Reproduce
c. Use energy
e. Produce waste
Explanation:
A single-celled organism is an organism which has only one cell while a multicellular organism possess more than one cell that has differentiated into performing more specific roles. However, irrespective of the difference in number of cells between a single celled and multicellular organism, all cells must possess certain characteristics that prove that they are living.
Some of these characteristics include:
- Growth: All living cells including must undergo growth, characterized by the increase in height and width of the organism.
- Reproduction: All living cells are capable of replicating themselves to form new organisms. This is called reproduction.
- Use energy: Cells, whether single celled or multicellular, make use of energy derived by the process of cellular respiration to perform their cellular functions.
- Produce waste: All cells remove waste in a process called EXCRETION.
However, not all organisms are capable of getting their own food. This is a characteristics of autotrophic organisms, and it's not a function of whether an organism is single celled or multicellular.
help pls help URGENT
Answer:
I think you got it right witth g
Explanation:
Which of the following describes how metamorphic rock forms?
Answer:
well they form by heat and pressure
Answer:
They form when they are under extreme heat and pressure.
Explanation:
did scientists accept wegeners theory? why or why not?
Answer:
No, scientists did not accept Wegener's theory
Explanation:
In a book titled; "The Origin of Continents and Oceans", published in 1915, Wegener introduced his ideas about the theory of continental drift.
According to his idea, "all the continents were once joined together in an "Urkontinent" before breaking up and drifting to their current positions"(live science).
Though some of his ideas were correct, some of them were also quite wrong. Scientists rejected his idea because he did not detail any mechanism by which the continental drift occurs.
What must be happening, according to Newton's second law of motion, if a rigid body of unchanging mass is observed accelerating?
A force is being applied to the mass.
A force was once applied but is now not being applied.
The mass must be changing.
No force was or is being applied to the mass.
Answer:
A force is being applied to the mass.
Answer:
A force being applied to the mass is the correct answer
Explanation:
Which of the following correctly associates both changes in heat energy with changes in states of matter?
O Adding heat - liquid to gas; removing heat - solid to liquid
O Adding heat - liquid to gas; removing heat - liquid to solid
O Adding heat - liquid to solid; removing heat - liquid to solid
According to the forces of attraction,adding heat changes liquid to gas; and removing heat changes liquid to solid.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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