Answer:
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It contains 75% of the atmosphere's mass and 99% of the total mass of water.
Explanation:
How are the law of definite proportions and the atomic theory related to each
other?
Answer:
they both have to do with proportions
Explanation:
write the chemical reaction and return the chemical equation: Ammonia when it interacts with oxygen produces nitric oxide (II) and water
Answer:
NH3 + 02 > NO + H2O
Explanation:
A patient is given 0.050 mg of technetium-99 m (where m means metastable—an unstable but long-lived state), a radioactive isotope with a half-life of about 6.0 hours.
How long until the radioactive isotope decays to 1.3×10−2 mg ?
The correct answer is 9.6h.
As you know, a radioactive isotope's nuclear half-life tells you exactly how much time must pass in order for an initial sample of this isotope to be halved.
Using the formula , A = Ao. [tex]1/2^n[/tex]
where , A- final mass after decay
Ao - initial mass
n - the number of half-lives that pass in the given period of time
Now, putting all the values, we get
1.3 × [tex]10^-2[/tex] mg = 0.050 mg × [tex]1/ 2^n[/tex]
Take the natural log of both sides of the equation to get,
㏑[tex](1.3 . 10^{-2} / 0.050 )[/tex] = ㏑[tex]((1/2)^{n})[/tex]
㏑[tex](1.3 . 10^{-2} / 0.050 )[/tex] = n. ln[tex](1/2)\\[/tex]
n = 1.6
Since n represents the number of half-lives that pass in a given period of time, you can say that
[tex]n = t / t _{1/2}[/tex]
t= 1.6 × 6 h
t = 9.6h
Hence, it will take 9.6 h until the radioactive isotope decays.
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Which continents were most difficult to place? Why?
Answer:
Antarctica and Australia
Explanation:
Since both of these are furthest south it is more difficult to measure the correct distance between them.
The continents that were the hardest to locate were Antarctica and Australia because they are both the ones that are the furthest south, making it more challenging to calculate the proper distance between them.
A continent is a huge, continuous landmass on the surface of the Earth, typically divided by oceans or other major bodies of water. Africa, Antarctica, Asia, Europe, North America, Australia, and South America are the seven continents of the world. In terms of topography, climate, culture, and biodiversity, each continent is distinct. For instance, Asia is home to the Himalayas, the world's highest mountain range, while Africa is renowned for its huge savannas and diverse animals. While Australia is well known for its distinctive flora and wildlife, Europe is known for its historical sites and artistic creations.
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Will GIVE BRAINLIST IF YOU ANSWER CORRECTLY Identity the type of reaction and balance the equation, including the states of matter, for the following reactions
(5 Points) aqueous aluminum nitrate is added to solid calcium
Type of Reaction: Double Displacement, Solid
Al(NO3)3 (aq) + Ca (s) → Al2Ca3 (s) + NO3 (aq)
(5 Points) aqueous barium chloride is added to aqueous potassium sulfate
Type of Reaction:
BaCl2(aq) + K2SO4(aq) → KCl (aq) + BaSO4 (s)
(5 Points) solid magnesium oxide is heated
Type of Reaction:
MgO (s) →
(5 Points) solid zinc is added to oxygen gas
Type of Reaction:
Zn (s) + O2(g) →
(5 Points) aqueous cobalt (II) chloride is added to solid magnesium filings
Type of Reaction:
CoCl2(aq) + Mg (s) →
(10 Points) Write a double replacement reaction where one of the products is copper (II) hydroxide. Include the states of matter for each of the reactants and products.
(10 Points) Write a decomposition reaction where the reactant is ammonium nitrate.
Include the states of matter for each of the reactants and products.
(10 Points) Write a synthesis reaction where one of the reactants is aluminum.
Include the states of matter for each of the reactants and products.
(5 Points) Give three indications that a chemical reaction has occurred.
Answer: i hope these help, lmk if they’re right.
Explanation:
In 5.49 seconds, 1.2 grams of Argon-35 decay to leave only 0.15 grams. What is the half-life of Argon-35
A- 21.96 seconds
B- 16.47 seconds
C- 1.83 seconds
D- 1.3725 seconds
The diagram shows an animal cell.
Which letter marks the location where carbon dioxide is
produced during respiration?
W
X
Y
Z
Answer:
X
Explanation:
Letter X is mitochondria. The mitochondria produces carbon dioxide, water, and ATP energy during cellular respiration.
What stage in the rock cycle is between metamorphic rock and igneous rock
Answer:
sedimentary rock
Explanation:
Because there are three stages, first igneous rock changes into either sedimentary rock or meatamorphic rock.
is there DNA in the stucture of prokryotic
Answer:
i hope this helped
They have no true nucleus as the DNA is not contained within a membrane or separated from the rest of the cell, but is coiled up in a region of the cytoplasm called the nucleoid. Prokaryotic organisms have varying cell shapes.
Explanation:
Answer:
Explanation:
The DNA in prokaryotes is contained in a central area of the cell called the nucleoid, which is not surrounded by a nuclear membrane. Many prokaryotes also carry small, circular DNA molecules called plasmids, which are distinct from the chromosomal DNA and can provide genetic advantages in specific environments.
Wood and a cement block are considered to be transparent and are good conductors of electricity.
true or false?
Answer:
ITS FALSE electricity doesn't travel through wood same with cement!
Which one of these is NOT a sign of chemical change? *
Fire
Bubbles
Liquid
Light
Heat
Cold
Answer:
light
Explanation:
light is either from electricity or from the sun
Thermal energy is the ___ of the kinetic and potential energies of all particles in an object.
A sum B difference C multiplication
Answer:
A.
Explanation:
I forgot butt im surely it is;-)
One mole of ANY element contains the:
same mass as one mole of any other element
same number of atoms as one mole of any other element
same gram-formula-weight as one mole of any other element
both the first and second choices
Answer:
1)The molar mass of an atom is simply the mass of one mole of identical atoms. However, most of the chemical elements are found on earth not as one isotope but as a mixture of isotopes, so the atoms of one element do not all have the same mass.
2)Equally important is the fact that one mole of a substance has a mass in grams numerically equal to the formula weight of that substance. Thus, one mole of an element has a mass in grams equal to the atomic weight of that element and contains 6.02 X 1023 atoms of the element.
Answer:all thing will be moving around
Please help.
Write the orbital notation for each of the following: (Be sure to label your sublevels)
a) O b) Sc
Explanation: In writing the electron configuration for oxygen the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for O go in the 2s orbital. The remaining four electrons will go in the 2p orbital. Therefore the O electron configuration will be 1s22s22p4.
Some animals have an organ called the gizzard. The gizzard is muscular and helps to crush up hard food. Earthworms and many birds, including chickens, have gizzards. Chickens swallow small rocks that help the gizzard to grind up food. Did plant-eating dinosaurs have gizzards too? No one has found an actual dinosaur gizzard, but they have found small piles of round rocks inside dinosaurs’ ribcages.
Based on its function, the gizzard is part of the *blank*
system.
Answer:
digstive system
Explanation:
Energy is defined as...
A.
the ability to do work.
B.
the ability to dissolve in water.
C.
the mass of a substance times its acceleration.
D.
how radioactive a substance is.
Answer:
A
Explanation:
the ability to dissolve in water
Answer: B.
Explanation: The ability to do work
What evidence do you need to determine that two rocks have some similar minerals because the minerals from the original rock was eroded then it was later compressed with other minerals to form a different rock.
Answer:
It comes from same parent material.
Explanation:
The two rocks have some similar minerals which indicates that they are comes from the same parent material but with the passage of time it is mixed with other minerals due to which they are some different in composition from one another so we can conclude that they comes from the same parent material due to the presence of some similar minerals.
A person rides in an elevator.
What is the equal and opposite force for the Earth's force of gravity pulling down on the person as
described by Newton's third law?
Answer:
Normal force
Explanation:
normal force always perpendicularly points away from a surface
Normal force is the equal and opposite force for the Earth's force of gravity pulling down on the person as described by Newton's third law.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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Which of the following is a Halogen?
Answer:
Fluorine(F),chroine(CI),bromine(BR),iodine(I)astatine(AT)
Explanation:
friend me when u say thank u
Based on your knowledge of the periodic table, identify the element Y.
Answer: argon
Explanation:
using the last clue “avg atomic mass of 3.33x greater than carbon-12” we can deduce the atomic mass of the element is 12x3.33=40(2sf) hence its argon. we can further confirm from third clue that it is a noble gas hence unreactive
The balanced equation for photosynthesis is shown below.
6 CO2 + 6H20 - C6H1206+6 02
Which statement best justifies the conservation of mass during photosynthesis? (4 points)
A
The number of oxygen atoms is equal to the number of carbon atoms on each side.
The total number of hydrogen atoms on both sides is 18.
The total number of carbon atoms on both sides is 6.
Answer:
- The total number of carbon atoms on both sides is 6.
Explanation:
- The total number of carbon atoms on both sides is 6.
The other options have incorrect numbers.
Explain how light is produced in neon signs.
Answer:
The energy that makes light is 'produced' when you pass a high-voltage alternating current through a low-pressure gas sealed in a glass tube.
Explanation:
Prokaryote.
Prokaryotes are (What) celled organisms that lack a nucleus and
membrane-bound organelles.
Answer:
single celled organisms
Answer:
singled celled organisms
Explanation:
Just had class and they said this in class
How many moles of MgO can be made from 5 moles of Mg?
2Mg + O2 -> 2MgO
Answer:
Explanation:
The expected product is MgO, so the 1-to-1 mole ratio Mg to O in the product is all that is required.
What type of compound is formed by the transfer of electrons from one atom to another?
1) Hydrogen Compound
2) Coordinate Covalent Compound
3) Ionic Compound
4) Covalent Compound
5) None of the above
Answer:
ionic compound
Explanation:
ionic bonding
In ionic bonding, electrons are completely transferred from one atom to another. In ionic bonding, electrons are completely transferred from one atom to another. In the process of either losing or gaining negatively charged electrons, the reacting atoms form ions.
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what is solvent!!?️
Answer:
Solvent, substance, ordinarily a liquid, in which other materials dissolve to form a solution.
Answer :
A Substance that dissolves a solute, resulting in a solution.
If you don't know how to find it between the solvent and solute then the solvent is usually the one that is of more quantity.
Certain gases in the atmosphere trap heat on Earth.
What is the name of this phenomenon?
cooling period
the greenhouse effect
global warming
glacial melting
if right i give brain thx and 5 star
Answer:
Greenhouse
Explanation:
Which runner had the fastest speed in the race?
Which runner had the slowest speed in the race?
Which runner had a head start?
The following answers are in order of the questions:
Which runner had the fastest speed in the race?
✔ A
Which runner had the slowest speed in the race?
✔ C
Which runner had a head start?
✔ C
What does the little ‘2’ in 2O2 mean?
Answer:200
Explanation:
Write the electron configuration of the element that has Z = 3 *
Answer:
1s²2s^1
Explanation:
Lithium Z = 3