Identify the reaction
In photo
Answer:
single displacement
Explanation:
What is the half-life of Technetium-99 if a 200 gram sample decays to 50 grams in 639,000 years?
Answer:
The half-life of Th-232 is 1.4 ∙ 10¹⁰ years.
Volcanic eruptions cannot be predicted by scientists.
true or false
Answer:
false
Explanation:
A new element, Thorsonium, has two isotopes. Thorsonium isotopes have a mass of 255 amu and 257 amu. Given the average atomic mass of Thorsonium is 255.65 amu, calculate the percent abundance for each Thorsonium isotope.
Answer:
255 amu has relative abundance 67.5% and 257 has relative abundance 32.5%
Explanation:
Average atomic mass =sum of product of atomic mass and relative abundance all divided by hundred or total abundance
Describe how the calcium atom and the oxygen atop form calcium oxide
Explanation: Formula and structure: Calcium oxide chemical formula is CaO and its molar mass in 56.0774 g mol-1. The molecule is formed by the calcium cation Ca+2 and the oxygen anion O-2, which form a ionic bond. The calcium oxide ionic lattice is cubic and similar to NaCl lattice, with an ion surrounded by 6 opposite charge-ion.
Help me which is it
which value of gas constant (R)use and when ?
in ideal gas equation.
Answer:
R is universal gas constant
It is has fixed value which would depend upon the units in which P,V and T expressed in the equation PV=nRT
R=
nT
PV
Answer:
value of R=0.0821atm,mol-¹k-¹
Can you please help me?
Answer:
ammonia 11
HCL. 2
sodium hydroxide 12
NAcl =7
ethanoic acid =3
How much total heat is required to bring 25.0g of ice at ~2.00 C to a liquid at 50.0 C? Please
Answer:
q=m*c*•
Explanation:
•=50-2
m=25
c=4.18
q=?
use this
Hey I'm Chloe, Can you Help me Thank you :)
Q: how can you tell if two objects are in thermal equilibrium?
Answer:
Two objects are in thermal equilibrium if they are in close contact that allows either to gain energy from the other, but nevertheless, no net energy is transferred between them. Even when not in contact, they are in thermal equilibrium if, when they are placed in contact, no net energy is transferred between them.
Explanation:
hope this helps chloe
6. Which change to a population would cause
increased competition among
its members?
SC.7.L.17.3
ES
an increase in population size
B a decrease in population size
© an increase in predation on the
population
D an increase of disease in the population
Answer:
B
Explanation:
Because I said so
Do the chemical formulas NO, NO2 and N2O provide the same information in all aspects? Explain.
Answer:
yes they do because is it quite into te aspects of ciencia
Which descriptions offer examples of Correction Services workers? Select all that apply.
Jadee guards a company’s office building to prevent crime.
Doug supervises Jailers and makes sure their work meets standards.
Cortez maintains order in courts of law.
Midori investigates crimes and arrests crime suspects.
Rudy monitors people who are on probation and parole.
Nancy guards inmates in a prison.
Answer:
its B, E, F
Explanation:
on edge 2021
Answer:
2. Doug supervises Jailers and makes sure their work meets standards.
5. Rudy monitors people who are on probation and parole.
6. Nancy guards inmates in a prison.
Select the correct answer.
What is the chemical formula of calcium chloride?
A.
CaCl
B.
Ca2Cl2
C.
Ca2Cl
D.
CaCl2
Answer:
D.CaCl2
Explanation:
Answer:
ans is D because the velency of calcium is 2 and clorine is 1 if we do cross multyply then it is option dWhich oxide is used to make red colour glass?
Answer:
Selenium
Explanation:
What is the mass of an atom of krypton? explain
Answer:
Krypton. Atomic Mass. 83.80u. Electron Configuration. [Ar]4s23d104p6.
Atomic Mass: 83.80u
Electron Configuration: 4s23d104p6
Year Discovered: 1898
Explain the difference between ionic and covalent bonding using the following term(s)
A. Electronegativities
B. Types of atoms bonding
Answer:
R we gonna say what letter if were gonna say it its A
Explanation:
SBc Its Our Lesson Today In Science
Standard temperature and pressure are
A. 0°C and 1.00 kPa
B. 0°C and 101.3 kPa
C. 273°C and 1.00 kPa
D. 273°C and 101.3 kPa
Answer:
D
Explanation:
Until the 1500s, doctors thought
diseases were caused spontaneously. Scientists
began proposing that diseases were caused by
seed-like entities that could be passed among
people. After the invention of the microscope,
doctors came to know that many diseases were
actually caused by microscopic living organisms
like bacteria. What does this suggest about the
nature of scientific knowledge?-
Answer:
D
Explanation:
Explain how Newton's idea about inertia has helped in astronomy?
o We can learn that objects in space like asteroid will keep its path unless a different force is applied to it
The Law of Inertia will help us discover distant galaxies
Inertia is used to help identify distance planets.
o We can figure out the size of far away planet through the Law of Inertia.
NEXT QUESTION
ASK FOR HELP
Answer:
the answer is A because when something is going straight it wont change unless its acted upon by a force
Explanation:
how does neutralization reaction help in the remedy of our digestion disorder? clarify
Answer:60
Explanation:
60 is 60 is 69 to the l the b i like eating j wek;gnl
Which of the following is one principle of the cell theory?
(1 Point)
A. Animals are the only living things made of cells.
B. Plants are the only living things made of cells.
C. All living things are made up of one or more cells.
Answer:
One principle of the cell theory is that living things are made up of one or more cells.
Explanation:
20 Points!!
Need it as soon as possible.
Answer:
D.
Explanation:
The reaction is losing potential energy, which means that the reaction is losing that energy as heat. Exothermic is the loss of energy. Therefore it will be D.
If an atom of Oxygen (8 protons, 8 neutrons, and 8 electrons) gains two electrons, what is the charge of the ion formed?
Answer:
It becomes negative
Explanation:
protons carry a positive charge
neutrons carry a neutral charge
electrons carry a negative charge
if we add 2 more electrons, the charge of the ion becomes negative
thank you.
Select the correct answer.
Which products are formed during the decomposition of magnesium nitride (Mg3N2)?
A.
Mg + 3N2
B.
3Mg + 2N2
C.
Mg + 3N
D.
3Mg + N2
E.
2Mg + 3N
Answer:
D. 3Mg + N2
Explanation:
magnesium nitride will decompose to form elemental magnesium and nitrogen gas
Mg₃N₂ → Mg + N₂
The reaction now needs to be balanced So that the number of Mg and N atoms in the reactants is equal to that of the products
A molecule is
A a group of atoms bonded by ionic bonds.
B a group of atoms bonded by covalent bonds.
C a group of ions bonded by covalent bonds.
D a group of atoms bonded by metallic bonds.
Answer:
B.
Explanation:
Atoms make up molecules and ionic bonds cannot make up a molecule because they do not share electrons like in a covalent bond.
The charge of a single proton is 1.60 × 10–19 C. What is the nuclear charge of an atom of boron (B)?
Answer:
[tex]q=8\times 10^{-19}\ C[/tex]
Explanation:
Given that,
The charge of a single proton is [tex]1.6\times 10^{-19}\ C[/tex]
There are 5 protons in the nucleus. The nuclear charge of an atom of boron is given by :
[tex]q=5\times 1.6\times 10^{-19}\\\\q=8\times 10^{-19}\ C[/tex]
So, the required charge is [tex]8\times 10^{-19}\ C[/tex].
basic forces.
Gravity is one of
Answer:
Fundamental force, also called fundamental interaction, in physics, any of the four basic forces—gravitational, electromagnetic, strong, and weak—that govern how objects or particles interact and how certain particles decay.
There is 1.00 × 102 mg of caffeine in a shot of espresso. The chemical formula of caffeine is C8H10N4O2. Determine the moles of carbon and hydrogen present in the caffeine in one shot of espresso
Answer:
In one shot of expresso, there are:
4.12 x 10^-3 moles of C atoms
5.15 x 10^-3 moles of H atoms
2.06 x 10^-3 moles of N atoms
1.03 x 10^-3 moles of O atoms
The moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
What is mole?A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
6.02 x 1023 chemistry instructors make up a mole. Anytime we want to make a reference to a lot of different things, it is much simpler to type the word "mole" rather than the number "6.02x1023." In essence, it is the reason this specific unit was created.
caffeine in a shot of espresso = 1.00 × 10² mg/1000=0.1g
mole of caffeine =0.1g÷ 194.19g/mol
=5.149× 10⁻⁴mole
moles of carbon =8×5.149× 10⁻⁴
= 4.11× 10⁻³moles
moles of carbon = 10× 5.149× 10⁻⁴
=5.14× 10⁻³moles
Therefore, the moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
To know more about mole, here:
https://brainly.com/question/15209553
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Similes and metaphors are poetic devices. What does this
mean?
Answer:
Both similes and metaphors are a poetic device because authors can be seen using them while writing their poem to give the reader a deeper understanding of the character and the setting. Metaphor is a figure of speech that talks about one this but refers to another. On the other hand, a simile is a figure of speech that compares two things together. Usually using the work "like" or "as".
Hoped it helped! Have a great day!
