Answer:
the answer maybe is 61.5 years (please check with others) tq
Explanation:
40/2=20
20/2=10
10/2=5
5/2=2.5
2.5/2=1.25
so one half life is 12.3 years
then 12.3 ×5 =61 .5
(why 5 ? because it decay 5 times to get 1.25 from 20)
what is convection,radiation,conduction?
Answer:
Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.
2.1 x 10^-3 x 2 x 10^2 =
a)
4.2 x 10^-5
b)
4.2 x 10^-1
c)
4.2 x 10^1
d)
4.2 x 10^-6
Answer:
I believe it is B
Explanation:
hope it helps. please let me know if it's wrong
How is a carbon atom different from a hydrogen atom?
Answer:
Carbon atom is a chemical element with the symbol C and atomic number 6 ( electrons). While Hydrogen atom is an atom of the chemical element hydrogen that have only 1 electron.
Explanation:
The carbon atom different from a hydrogen atom, because the atomic number of hydrogen is 1 . The atomic mass number of hydrogen is also one. For the carbon atom, the atomic number is 6, and the atomic mass number of carbon is 12.
What is an atomic number ?The term atomic number is defined as the number of a chemical element in the periodic system. The elements are arranged in order of increasing number of protons in the nucleus.
The atomic number is situated at the upper left, or number of protons. In the middle is the letter symbol for the element. Atomic number is equal to the proton number or the number of protons found in the nucleus of every atom of that element.
Thus, Carbon atom is a chemical element with the symbol C and atomic number 6. Whereas hydrogen atom is an atom of the chemical element hydrogen that have only 1 electron and its symbol is H.
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Any two difference between short sightedness and long sightednes
Explanation:
tala it is also called myopia lekhnu hai
Äni Arko MA it is also called hypermetropia .
Explain how scientists
came to the conclusion that “All living things are made of cells".
Answer:
scientist came to the conclusion that all living things are made of cells by con
Explanation:
help me with cience for brainest:) its easy:)
Answer:
Stronger
And its science
Explanation:
Answer:
stronger for top.
weaker for bottom.
passed all sciences in freshman year :D
If you find a chemical in the lab and are unsure of
its identity, what is the best way to find out what it
is?
Answer:
C. read the label on the container
Explanation:
What information is found in an SDS? Check all that apply.
A. the identification of the chemical
C. the chemical and physical properties of the substance
D. the first-aid measures to take if an accident occurs involving the chemical
Answer:
C
Explanation:
just did it
In a population of wheat,
variation in the height of
the wheat decreases
over time so that short
wheat plants survive
more than other heights.
When sodium atoms (Na) and chlorine atoms (CT) join to make sodium chloride, or table salt, they form an ionic bond, Using this information, which pair of elements is most likely to form an ionic bond? O potassium (K) and fluorine (F) aluminum (AI) and aluminum (AD O sulfur (S) and oxygen (O) O calcium (Ca) and neon (Ne)
Answer:
D I'm pretty sure.
Explanation:
I'm taking the quiz right now and D makes the most sense.
Answer:
d
Explanation:
When a plant dies, it often decomposes and becomes part of the soil. This process is one step in which cycle?
Answer:
Carbon Cycle
Explanation:
When a plant dies, it often decomposes and becomes part of the soil. This process is one step in carbon cycle
What is soil ?
The soil is nothing but a mixture that contains minerals, organic matter, and living organisms, it is a loose sediment. Moreover, there are different types of soil such as Clay Soil, Sandy soil, Loamy Soil, Silt Soil
soil composed of 45% minerals, 50% spaces or voids and 5% organic matter, it performs many important functions such as Providing a growth medium for the plants, Acts a modifier of the earth’s atmosphere and it is One of the most crucial components of the biosphere
The formation of soil occur by weathering of rocks. the weathering of Solid rock can weather occur in three way such as Mechanical Weathering, Chemical Weathering, Biological Weathering
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Organisms that make energy are called ____.
Answer:
Producers
Explanation:
An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. Because autotrophs produce their own food, they are sometimes called producers.
2. The atomic number of an atom comes from *
The number of electrons.
The number of neutrons.
The number of protons.
Its atomic mass.
determine the theoretical yield.
aluminum metal reacts with aqueous nickel II sulfate to produce aqueous aluminum sulfate and nickel as a precipitate. in this reaction 108 grams of aluminum were combined with 464 grams of nickel II sulfate to produce 274 grams of aluminum sulfate.
The question is incomplete, the complete question is;
In this stoichiometry problem, determine the percentage yield:
Excess aluminum metal reacts with aqueous nickel(II) sulfate to produce aqueous aluminum sulfate and nickel as a precipitate. In this reaction 108 g of aluminum were combined with 464 g of nickel(II) sulfate to produce 274 g of aluminum sulfate.
Answer:
80%
Explanation:
The correct equation for this reaction is;
2Al(s) + 3NiSO4(aq) --------> Al2(SO4)3 + 3Ni(s)
We already know that Al is in excess then NiSO4 is the limiting reactant.
Hence, Number of moles in 464 g of NiSO4 = mass/ molar mass
Molar mass of NiSO4 = 155 g/mol
Number of moles = 464g/155g/mol = 2.99 moles
Number of moles of Al2(SO4)3 = mass/molar mass
molar mass = 342 g/mol
So, Number of moles = 274g/342g/mol = 0.8 moles
Given the stoichiometric reaction equation;
3 moles of NiSO4 yields 1 mole of Al2(SO4)3
2.99 moles of NiSO4 yields 2.99 * 1/3 = 1 mole of Al2(SO4)3
percentage yield is given by; actual yield/ theoretical yield * 100/1
actual yield = 0.8 moles of Al2(SO4)3
Theoretical yield = 1 mole of Al2(SO4)3
Hence;
% yield = 0.8/1 * 100 = 80%
What type of
energy travels in the form of electromagnetic waves?
A: Chemical Energy
B: Gravitational Energy
C: Nuclear Energy
D: Radiant Energy
Answer:
Radiant Energy
Explanation:
Radiant energy is created through electromagnetic waves
what the correct answer
Answer:
sulfer has 6 energy levels/orbits and 16 valence electrons
True or false When heat flows to an object, it can change states.
Answer: True
Explanation:
The matter exists as solid, liquid or gas. These are called the states of matter. The change of matter from one state to another can be achieved by heating or cooling.
The solid state can be converted into liquid state by providing heat to solid. The heat will make the particles move farther, resulting into liquid state.
Similarly when liquid state is provided heat, it changes to gaseous state. The heat will make the particles move much more faster.
Thus the statement that when heat flows to an object, it can change states is True.
Why do positive ions have a positive charge?
Answer:
Ions form when atoms gain or lose electrons. Since electrons are negatively charged, an atom that loses one or more electrons will become positively charged; an atom that gains one or more electrons becomes negatively charged. Ionic bonding is the attraction between positively- and negatively-charged ions.
what is chemistry?
in your own word please 2-3 sentence
Answer:
the science that deals with the properties, composition, and structure of substances they undergo, and the energy that is released or absorbed during these processes.
Explanation:
Answer:
Is the scientific branch that deals with the composition and decomposition of elements and compounds in nature
what percent of the sun's energy is used by the living organism on earth
a. 1%
b. 10%
c. 20%
d. 35%
e. 50%
Answer:
1% A
Explanation:
Which statement about anabolism is true?
A. In anabolism, energy is released.
B. In anabolism, energy is absorbed.
C. In anabolism, energy is absorbed and then released.
O
D. In anabolism, energy is released and then absorbed.
Answer:
i would say B? Im sorry if im wrong
Explanation:
i think that because Catabolic reactions release energy, while anabolic reactions use up energy. Anabolism is the opposite of catabolism.
Answer:
B) In anabolism, energy is absorbed.
ehat is the name of the hydrate Ba(OH)2 8 H2O
Answer: Barium hydroxide octahydrate
Explanation:
Atoms combine in whole-numbcher ratios.
The primary food source for many sea animals is:
crayfish
squid
sea grass
plankton
Answer:
plankton
Explanation:
like in spongebob lol but for real I'm a marine biologist I know this is the answer lol
Jack is melting butter in a pan. He observes a clear liquid with many solid particles floating in it. Based on Jack's observation, what conclusion can be made about butter?
Answer:
B.
Butter is a mixture of pure substances.
Explanation:
just poop and you will see
BRAINLIST AND 45 POINTS
In your own words, describe how magma changes form through the rock cycle to eventually become magma again.
Answer:
Magma becomes rock after the heating process has settled.
Explanation:
Magma is a kind of lava or in other words "Hot melted rock". When rock get really hot it transforms from rock it's solidified state and becomes magma. When magma is hot it can stay that way for a while or until it cools down. When magma does cool down it starts the solidifying state start to come out. If you let the magma cool it will become rock again. This process will happen over and over and it never stops. Every time magma gets cool it hardens, every time it gets hot it melts or and becomes magma. So in conclusion magma only turns back when it has been heated up and liquify.
The rock cycle explains the formation and breaking of the three forms of the rocks through various modes. The magma becomes rocks and magma again through the heating and cooling process.
What is magma?Magma has been the semi-hot liquid that is present in the mantle in the lithosphere of the earth. They have very high temperatures and can push through the crust in the form of volcanic eruptions.
The magma changes its form from semi-liquid to rocks and back to magma again through the rock cycle. The hot molten magma pushes through the crust, cools, and then forms rocks. These rocks after many years start melting at higher temperature or get deep down the mantle where it converts to semi-liquid again.
Therefore, the rock cycle converts the magma.
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How did chemists change Mendeleev's periodic table in the early 1900s?
Answer:
They used atomic number instead of atomic mass to organize the elements. From an element's location in the periodic table, you can predict: ... The elements have similar properties.
Why do longer wavelengths are considered to have lower frequencies? Make it as elaborate as possible. :D
Answer:
Longer wavelengths self means by it's name that the distance between the trough and crust are lesser than that of shorter wavelengths!
The word Lower frequency implies lower energy, thus light cannot easily penetrate the EM wave to excite electrons.
Examples of EM waves with longer wavelength :
Radiowaves, microwaves, etc..
1. Al +
LINO2 + _______ + _________
answer; the last two is me and u :
true or false; some organisms are not affected by any abiotic factors
Answer:
True
Explanation:
Answer:
False
Explanation:
What's wrong with the statement "a mug of hot chocolate contains more heat than a glass of cold water."
Answer:
Heat is not something that can be contained since it is not a tangible thing. Heat is a process
Explanation:
The wrong thing in this statement "a mug of hot chocolate contains more heat than a glass of cold water."is: Heat is a process. Heat is not something that can be contained since it is not a tangible thing.
What is Heat ?Heat can be defined as a state or quality of being hot or in a high temperature.
Heat can also be said to be a transfer of kinetic energy from one environment to another, from one medium to another, or from one object to another.
In conclusion, Heat is a process. Heat is not something that can be contained since it is not a tangible thing.
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