Answer:
A because even if its a minor cut, it's always a better choice to inform someone.
How many moles of Ag contain 4.49 x 1023 atoms Ag?
Answer:C, 0.746 mol Ag.
1 mol Ag = 6.022 x 1023 atoms of Ag -> 4.49 x 1023 atoms of Ag x 1mol Ag/6.022 x 1023 atoms -> 0.746 mol Ag
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.746 mol of Ag contain 4.49 x 10²³ atoms Ag.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
given number of atoms of Ag=4.49 x 10²³ atoms
Substituting the values
mole= 4.49 x 10²³ ÷ 6.022×10²³
mole = 0.746 mol
Therefore, 0.746 mol of Ag contain 4.49 x 10²³ atoms Ag.
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how much energy is released when 23 g of steam at 100 Celsius is condensed into liquid water?
H = mc∆T
H = 23g * 4.2J/g°C *(100°C - 0°C)
H = 9660 J
H = 9.66 KJ.
The energy released is 9.66 KJ.
Why are alloys generally used to make everyday objects?
Answer:
Alloys are often stronger and less active than pure metals. Alloys have higher melting point than pure metals.
if an atom has 8 protons, 8 neutrons, and 8 electrons and then loses a neutron, what is it?
Answer:
A Cation
Explanation:
Emma strikes a match and sets some logs on fire. As the fire burns, which two forms of energy are released?
Answer:
Explanation:
There are changes in the chemical composition of the word.
There's light energy given off.
There's heat energy given up.
this is the new one I will mark brainlist NO LINKS OR I WILL REPORT YOU
Answer:
ok what is new. ........,,,,,
Use the equation to answer the question.
CH4 + _____Cl2 → CCl4 + _____HCl
Which numbers balance this equation?
The whole Balanced Reactions Quick Check for Honors Chemistry A is
1) A. The reactants and products have the same number and type of atoms, but the atoms may be recombined.
2) B. It shows how many molecules there are of a particular substance.
3) D. NaOH + HCl → NaCl + H2O
4) A. Atoms always remain intact during chemical reactions.
5) D. 4, 4
The balanced chemical equation is:
CH₄ + 4Cl₂ —> CCl₄ + 4HCl
The numbers that balanced the equation are: 4, 4
To know the number that balanced the equation, we shall simply balance the equation.
CH₄ + Cl₂ —> CCl₄ + HCl
There are 4 atoms of H on the left side and 1 atom on the right side. It can be balance by writing 4 before HCl as shown below:
CH₄ + Cl₂ —> CCl₄ + 4HCl
There are 2 atoms of Cl on the left side and a total of 8 atoms on the right side. It can be balance by writing 4 before Cl₂ as shown below:
CH₄ + 4Cl₂ —> CCl₄ + 4HCl
Now, the equation is balanced
The numbers that balanced the equation are 4,4
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Someone pls help me I will make you brain
Answer:
2 and 3 is the answer because Methane is emitted from a variety of anthropogenic (human-influenced) and natural sources. Anthropogenic emission sources include landfills, oil and natural gas systems, agricultural activities, coal mining, stationary and mobile combustion, wastewater treatment, and certain industrial processes
an item composed of at least 3 identifiable different compounds
distinguish between the crust and and the lithosphere
Answer:
What is the difference between the crust and lithosphere? The crust (whether continental or oceanic) is the thin layer of distinctive chemical composition overlying the ultramafic upper mantle. ... The lithosphere is the rigid outer layer of the Earth required by plate tectonic theory.
Explanation:
Meat or fish spoilage is often due to spoilage bacteria which utilize. to grow in population.
glucose and free amino acids.
glucose
free amino acids
sulfides
Answer:
glucose and amino acids
Explanation:
Which sphere protects Earth’s surface?
atmosphere
biosphere
geosphere
hydrosphe
Answer:
Hiii
Explanation:
Your answer is Atmosphere
The atmosphere protects life on Earth by absorbing ultraviolet solar radiation and warming the surface through heat retention (the greenhouse effect). The atmosphere is further classified into multiple layers by temperature, which include the thermosphere, the mesosphere, the stratosphere, and the troposphere.
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what do you think life on earth will be like if chemistry had not been put to practical use
Explanation:
Archaism
Things on Earth would be unexplainable
Helpp meeee the picture is above.
Answer:
a) 2.7 g cm³
b) 10.2 g
Explanation:
a) Density = Mass/Volume
= 21.6/8.00
= 2.7 g cm³
b) Mass = Volume × Density
= 2.55 × 4.0
= 10.2 g
Read the article by Michael Fumento, writer for the New York Post editorial blog, who does not support global warming.
Back in 2005 I and others reviewed the entire hurricane record, which goes back over a century, and found no increase of any kind. Yes, we sometimes get bad storms—but no frequently now than in the past. The advocates simply ignored that evidence.
Fact is, the earth was cooling and warming long before greenhouse gases could have been a factor. The [global warming supporters] have been proved wrong time and time again.
Which best describes the reliability of the source?
Nationally certified organizations are considered an unreliable source because the public can access their information.
Charities are considered a reliable source because the public makes financial contributions to them.
Editorial blogs are considered an unreliable source because the author may not have a science background.
Editorial blogs are considered a reliable source because authors contribute to them regularly.
The editorial blogs are considered an unreliable source because the author may not have a science background. Option C
What the reliability of a source?We know that not all sources of information could be taken to be reliable. A source of information could come across as being reliable when the source is an authority in the area in which the information is furnished.
Such authorities often publish authentic and verified information in reputable journal that are meant for professional consumption.
Thus, the editorial blogs are considered an unreliable source because the author may not have a science background.
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Soraya left some soup in the refrigerator. She looked at the soup every day, but she always decided not to eat it. After five days, she started to see mold growing on the surface of the soup. She looked up mold online and found that mold is made of fungal cells. Why didn't Soraya see the mold growing on the soup before the fifth day? Why can she see it now?
Explanation:
In general, the longer that moisture is present, the greater the chance for mold to grow and spread. When mold spores encounter a moist surface, it starts growing within a few hours, spreading into the material while also filling the air with thousands of mold spores.
Que instrumentos de laboratorio usaron luis y Juan?
Luis y Juan querían hacer una investigación sobre la rapidez de disolución de una pastilla efervescente en el ácido acético a temperatura caliente. Para esto, tenían que triturar la pastilla y luego utilizar solamente 15 gramos de la sustancia. Tenían que medir 50 ml de ácido acético y colocar el mismo en un recipiente donde se pueda calentar sustancias, pero que el vapor generado se libere rápido. Al agregar ambas sustancias al recipiente de vidrio, lo comenzaron a calentar. Una vez se iba calentando, agitaron las sustancias poco a poco y con mucho cuidado, tomaron los cambios en temperatura de cada 2 minutos. Al finalizar el experimento, ellos compartieron sus resultados con sus compañeros de clase.
Drop it into water. Measure the time required for tablet to fully dissolve. Be prepared to start and stop on time. The reaction will take less than 15 seconds.Answer:
Explanation:
What does it mean to say that a wave is cyclic, or periodic, disturbance?
Answer:
Wave is a disturbance or energy that propagate through medium from one point to other point
So basically it is a flowing energy that flows into the medium and hence medium particles start oscillating about their mean position to and fro.
This motion of medium particles or this to and fro motion is about their mean position and this will always be cyclic or periodic motion
This means the disturbance or energy continuously flow through the medium such that it will change the position of medium particle and this will be cyclic in order
For an example
y(x,t) = Asin(kx - ωt + φ)
So here above equation of wave is a travelling wave in which displacement of medium particle from its mean position is given by "y"
Now we can see that this disturbance depends upon the sine function and it will repeat its same position after every 2 pi time interval as it is cyclic function for this value
Due to this phenomenon of repetition of its same position we can say that it is disturbance of wave is cyclic.
Explanation:
PLEASE HELP! Which rock is an example of a chemical sedimentary rock?
coal
iron ore
shale
sandstone
Answer:
sandstone
Explanation:
Answer: iron ore
Explanation: The iron ore deposits are found in sedimentary rocks. They are formed by the chemical reaction of iron and oxygen mixed in the marine and fresh water.
A formula unit represents the simplest ratio of elements in a
Answer:
formula unit
Explanation:
formula unit represents the simplest ratio of elements.
Sam wants to know how fast his brother can run. He knows the time it took for his brother to run
from the starting line to the finish line. What else does he need to know in order to calculate the
speed of his brother?
O He needs to know what time his brother ate lunch.
O He needs to know the direction his brother ran.
O He needs to know the distance from the starting line to the finish line.
can evaporated milk be substituted for heavy cream?
Answer:yes
Explanation:
during a chemical reaction when the products of that reaction require less potential energy describe what happens to the surroundings?
Which choice is an element? carbon dioxide water carbon air
Answer:
carbon
Explanation:
Considering the definition of elements ans compounds, carbon is an element.
Elements are simple substances that cannot be broken down by common chemical methods. The atoms in an element are the same as each other, yet they are different from those in other elements. In addition, the elements are represented by a symbol and can be found in the periodic table.
On the other hand, compounds are substances that are the result of the chemical union of two or more elements. This combination makes it impossible to identify each element by its individual and original properties. Compounds can be separated by chemical action.
In summary, the element is a pure chemical substance formed from an atom, which is characterized in that it cannot be divided or transformed by a chemical reaction. Whereas a compound is a pure chemical substance made up of a particular set of molecules or ions that are chemically bound together.
So, being:
carbon dioxide: composed of carbon and oxygen water: composed of two atoms of hydrogen and one of oxygenair: composed mainly of oxygen and nitrogenthen, carbon is an element.
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How does the chemical structure of ionic liquids make them more flexible for scientists to use and what will most likely be the first industrial application of them?
Explanation:
Ionic liquids offer numerous advantages over conventional organic solvents for carrying out organic reactions, Malhotra notes. "In many cases, product recovery is easier, catalysts can be recycled, and the ionic liquids can be reused," he says. "In addition, their thermodynamic and kinetic behavior is different.
Convert 3,526 meters (m) into kilometers (km). (Don't forget units)
EN
Voranean
Answer:
3,526 meters (m) into kilometers (km) = 0.003526 kilometers
Explanation:
Elements have different properties because they are made up of different types of
atoms.
Right a 5 sentence paragraph explaining this!!!
Answer:
,
Explanation:
Answer:
An atom is the smallest partical in the universe that makes up everything you see around you. Every chemical element is also made up of atoms. Since atoms are what give each element their defining characteristics, each element can be composed of multiple atoms but you must have all of the same type of atoms combined in order for it to be considered an element. For example the element gold can only contain gold atoms. If you mix the atoms of one element with the atoms of another your substance has then been changed from an element to a compound.
Explanation:
Could someone help me pls
Answer:
a) dispersion
b) draw the path ray of green light between the red and violet path rays
c) greater/faster
Explanation:
b) Order of rainbow colours:
RedOrange YellowGreenBlueIndigoVioletc) Violet is the most refracted colour while red is the least refracted colour; the colour with a greater speed is the most refracted
which type of control agent exerts noncompetitive inhibition?
Answer:
D
Explanation:
If your choices are:
a) Substrate analog
b) Protein kinase
c) Allosteric effector
d) Both (b) and (c).
then your answer is D :)
which tissue carrys messages to and from the brain
Answer:
nervous tissues
Explanation:
Nervous tissue is found in the brain, spinal cord, and nerves. It is responsible for coordinating and controlling many body activities. ... The cells in nervous tissue that generate and conduct impulses are called neurons or nerve cells. These cells have three principal parts: the dendrites, the cell body, and one axon
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