I think it is H. Boiling Point
Answer:
Boiling point
Explanation:
If you want to find the boiling point of an unknown liquid, just use beaker, a hot plate, and a temperature probe.
Boiling is characterized by the rapid transition from liquid to gaseous, with the formation of vapors (bubbles) inside the liquid. As in fusion, there is a temperature (boiling point) at which a given substance changes from a liquid to a gaseous state. This temperature is the boiling point.
In the case shown in the question above, you will need to pour the liquid into the beaker and heat it up with the hot plate. With the temperature probe, you will mark the temperature that the liquid started to boil.
the molar mass of H2O is 18.015 g/lol. How many grams of H2O are present in 0.20 mol
I'm not sure because I took chem. a long time ago, but I think 3.6 grams H2O
Hope this helps!!!
The amount of water present in the given number of moles is 3.603 g.
The given parameters;
Molar mass of water (H₂O), m = 18.015 g/molNumber of moles of the water, n = 0.2 molThe amount of water present in the given number of moles is calculated as follows;
mass = molar mass x number of moles
mass = 18.015 g/mol x 0.2 mol
mass = 3.603 g
Thus, the amount of water present in the given number of moles is 3.603 g.
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Which of the following was a result of the atomic theory? O A. Alchemy was shown to be a true science. O B. The atom was discovered O C. The existence of the four elements was proven. O D. It helped chemists better understand the properties of matter.
The statement that demonstrates the result of the atomic theory is as follows:
It helped chemists better understand the properties of matter.Thus, the correct option for this question is D.
What is Atomic theory?Atomic theory may be defined as a type of scientific theory which signifies that matter is composed of particles called atoms. It significantly describes the attributes of matter and its nature throughout.
Atomic theory typically describes the structure, behavior, and other properties of the atom and its component parts that are known as the constituents of matter. It only deals with all the possible characteristics of matter via physical, chemical, and functional aspects.
Therefore, atomic theory helped chemists in order to better understand the properties of matter. Thus, the correct option for this question is D.
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Final answer:
The atomic theory resulted in a deeper understanding of the properties of matter, disproving alchemy and leading to the development of fundamental concepts like atoms, molecules, and the periodic table.
Explanation:
The result of the atomic theory was that it helped chemists better understand the properties of matter. This understanding came from the idea that matter is made up of atoms, and this concept greatly influenced the development and advancement of chemistry from alchemy. Chemists could now explain why substances reacted in the way they did based on the behavior and characteristics of their atoms. Thanks to scientists like John Dalton and Amedeo Avogadro, the foundational units of matter -- atoms and molecules -- were identified, leading to the establishment of key principles such as Dalton's law of multiple proportions and Avogadro's number.
Alchemy was disproven as alchemy morphed into the science of chemistry and the pursuit of transmuting elements was abandoned. Instead, systematic studies of elements and the recognition of periodicity in their properties led to the creation of the periodic table. Moreover, alchemy's secretiveness was replaced with a new approach where discoveries were shared, further accelerating scientific progress and refining our understanding of the atomic structure of matter.
In summary, the atomic theory shifted the focus of scientists from mystical alchemy to empirical and systematic scientific study, providing a clearer understanding of the periodicity of elements and their reactions based on atomic composition.
The distance between a proton and an electron is cut in half. How does the force of attraction change? A) The force becomes twice as much. B) The force becomes one-half as much. C) The force becomes four times as much. D) The force becomes one-quarter as much.
C) The force becomes four times as much.
THANK MEE
Answer: The force becomes four times as much
The electric force is a force that is inversely proportional to the square of the distance. This can be proved by Coulomb's Law, which states:
"The electrostatic force between two point charges and is proportional to the product of the charges and inversely proportional to the square of the distance that separates them, and has the direction of the line that joins them"
Mathematically this law is written as:
(1)
Where is a proportionality constant.
Now, if we say is the proton and is the electron, and cut the distance between them in half, the new distance will be .
Substituting this new distance in equation (1):
(2)
(3)>>>As we can see, the force becomes four times stronger
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(ASAP WORTH 10 POINTS) The table below describes two parts of a cell. Which of the following is most likely correct?
Part A is cell wall, Part B is chloroplast
Part A is chloroplast, Part B is cell wall
Part A is cell wall, Part B is cell membrane
Part A is chloroplast, Part B is enlarged vacuoles
It would be C!
Only plants have chloroplast, they use it in the process of photosynthesis. The cell membrane is found in both plant and animal cells, though! It works to regulate whatever comes inside the cell, and it also assists in holding the cell's shape.
Answer
C
Explanation:
This is because for the first one only plant cells have chloroplasts which contain chlorophyll which is used to absorb sunlight.
The second was incorrect to because cell membranes are not present in animals cells.
The last one is incorrect because enlarged vacuoles are not present in an animals cell.
While soils are an important part of the global carbon cycle, they are not a part of the nitrogen and sulfur cycles.
True or false ?
The correct answer is - False.
The soils are part of most of the major cycles that take place on the Earth, mainly because they are in touch with the other spheres. The carbon dioxide, as well as the nitrogen and the sulfur cycles too, end up in the soil in more cases than not during their cycles. While some are formed in it and than released, like the sulfur, the carbon mostly gets in it though the roots of the plants, as well as the decomposing organisms, and the nitrogen ends up in the soil with the water.
The soil is one of the most important pieces in the cycles of most of the gases on Earth, and without it, some will not even be possible.
A 48.3 mL sample of gas in a cylinder is warmed from 22 C, 87 C to 0.0 C what is the final temperature
The answer is:
the volume stays the same. it is the pressure that increases
What difference do you notice between light traveling between air and water and air and glass?
Well glass and water or more heavy then air
Answer:The light ray bends more at the air-glass boundary than at the air-water boundary.
Explanation:
Got it from plato
How many moles are present in 9.15 grams of h2o
First, find the molar mass of H2O. It may vary depending on your source. Use the source your teacher gave you.
I got 18.015 g/mol as the molar mass of water.
Then you basically do some math to figure out the amount of moles...
9.15 grams × (1 mole H2O)/(18.015 grams H2O) = .5079
There is approximately .51 moles present.
Final answer:
To find the number of moles in 9.15 grams of H2O, divide the mass by the molar mass of water, which is 18.015 g/mol, resulting in approximately 0.508 moles of water.
Explanation:
To calculate the number of moles in 9.15 grams of H2O, we use the molar mass of water as a conversion factor from mass to moles. The calculation for the molar mass of water (H2O) is as follows:
(1.0079 + 1.0079 + 15.999) = 18.015 g/mol
To convert from grams to moles, we divide the mass of the substance by its molar mass:
Number of moles = Mass of substance (in grams) / Molar mass (in g/mol)
In this case:
Number of moles = 9.15 g / 18.015 g/mol
Calculate the value to find the number of moles present in 9.15 grams of water:
Number of moles = 0.508 moles (approximately)
I need help on what it is
There are 14 neutrons in Silicon. (neutrons are equivalent to the atomic number)
The image compares the arrangement of electrons in two different neutral atoms.
Which of the following best explains the position of the two atoms in the periodic table?
A)Both atoms have an estimated Zeff of 1; therefore, Atom D is to the right of Atom E in the same period.
B)Both atoms have Zeff of 1; therefore, Atom D is above Atom E in the same column because of the additional energy level.
C)Atom D has an estimated Zeff of 1 and is therefore to the left of Atom E, which has a Zeff of 9.
D)Atom D has an estimated Zeff of 1 and is therefore below Atom E in the same column, which has a Zeff of 9.
Answer:
Option B) Both atoms have Zeff of 1; therefore, Atom D is above Atom E in the same column because of the additional energy level.Explanation:
Zeff means the effective nuclear charge and it is equal to the atomic number (number of protons) less the core electrons (all the electrons less the valence electrons).
Zeff=number of protons − number of core electronsNumber of core electrons is equal to the total number of protons less the number of valence electrons, so you get:
Zeff = # protons - (# total electrons - # valence electrons)Since, the atoms are neutral, # protons = # total electrons, which yields to:
Zeff = # total electrons - (# total electrons - # valence electrons)= # total electrons - # total electrons + # valence electrons
= # valence electrons.
So, we have found that Zeff = # valence electrons
In the image, each circle represents a different energy level, with increasing energy when you move away from the nucleus.
The image is showing that both atoms D an E have one valence electron (the only electron is the outermost energy level). Atoms with the same number of valence electrons are in the same column of the periodic table, so both atoms are in the same column and have Zeff of 1 (each circle represents a different energy level, with increasing energy when you move away from the nucleus).
Atom D has fewer energy levels, so it is above atom E in the periodic table.
Hence, you have found that the image is showing that both atoms have Zeff of 1; therefore, Atom D is above Atom E in the same column because of the additional energy level.
During gas exchange, which substance moves from the alveoli into the blood?
A. Nitrogen
B. Water
C. Carbon Dioxide
D. Oxygen
The exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
Hope this helped
it is either C or D but i really dont know but good luck
A rock sample weighing 5.88 x 10-4 g is known to contain calcium, phosphorus, and oxygen. The amount of the first two elements in this rock is found to be 2.28 x 10-4 g and 1.18 x 10-4 g respectively. What is the empirical formula for the compound in this rock sample?
Answer:
Ca₃P₂O₈.
Explanation:
Firstly, we can determine the mass of oxygen:The mass of oxygen in the rock = the mass of the rock - (the mass of Ca + the mass of P) = (5.88 x 10⁻⁴ g) - (2.28 x 10⁻⁴ g + 1.18 x 10⁻⁴ g) = 2.42 x 10⁻⁴ g.
We need to determine the no. of moles of each element in the rock:no. of moles = mass/atomic mass.
no. of moles of Ca = (2.28 x 10⁻⁴ g)/(40.078 g/mol) = 5.689 x 10⁻⁶ mol.
no. of moles of P = (1.18 x 10⁻⁴ g)/(30.97 g/mol) = 3.81 x 10⁻⁶ mol.
no. of moles of O = (2.42 x 10⁻⁴ g)/(16.0 g/mol) = 1.51 x 10⁻⁵ mol.
To find the mole ratio of (Ca: P: O), we divide by the lowest no. of moles that of P (3.81 x 10⁻⁶ mol).The mole ratio of (Ca: P: O) will be ((5.689 x 10⁻⁶ mol)/(3.81 x 10⁻⁶ mol): (3.81 x 10⁻⁶ mol)/(3.81 x 10⁻⁶ mol): (1.51 x 10⁻⁵ mol)/(3.81 x 10⁻⁶ mol)).
∴ The mole ratio of (Ca: P: O) will be (1.5: 1.0: 4.0).
Multiplying by 2.0 to get the empirical formula of the rock:
The empirical formula of the rock is Ca₃P₂O₈.
(REALLY NEED HELP 30 POINTS )If the mass of a material is 12 grams and the volume of the material is 49 cm^3, what would the density of the material be? And it's not 4.08 g/cm3
The answer is 0.25 g/cm3
The equation for finding density is mass divided by volume.
Therefore,
12 grams/ 49 cm3= 0.24489795918367 gram/cubic centimeter
you would then round this to the nearest significant figure which is the number of significant numbers you have and the highest amount of sig figs present in this equation is two sig figs. That means that you would round your answer, becasue it has a zero before the decimal which doesn't count as a significant figure, to the nearest hundredth which would be 0.25 and then you add your value after it which is g/cm3
Density = mass/volume
Density = 12g/49cm^3
Density = 0.24 g/cm^3
A 25.00 mL flask contains methane (CH4) gas at 22.5°C. The pressure in the flask is 225.2 mmHg. How many moles of methane are in the flask?
= 0.232 moles
Explanation;Using the ideal gas Law ;
n = PV/RT ; Where, R is the ideal gas constant (0.0821 L atm / K mole), n is the number of moles, P is the pressure, V is the volume and T is the temperature.
V = 0.025 L, T = 22.5 +273 = 295.5 K, P = 225.2 mmHg
n = (225.2 × 0.025)/(295.5 × 0.0821 )
= 0.232 moles
How many moles of KOH are in 2.5L of a 3.0 M solution?
Formula
Concentration = mols / Liters
Givens
C = 3 moles / Liter
V = 2.5 L
mols = ???
Solution
3 = mol/2.5 Multiply both sides by 2.5
3*2.5 = mol/2.5 * 2.5 Cancel on the right. Combine on the left.
mol = 7.5
Answer: 7.5 mols
What information does an empirical formula give ?
Im sure its D
Empirical formula has the lowest number (simplified) version in an equation of molecules
Density is a measure of how much space or volume a certain amount of mass takes up. It is relative heaviness.
TRUE/FALSE
The given statement related to density is false.
Density is a relationship between mass and volume. To derive the formula for density we divide mass by volume. When the mass of the matter is compact but it acquires more volume then it is indicative of the fact that the matter has less density. When the mass of the matter is heavy and it acquires less volume then it is indicative of the fact that the matter has more density. Density is not indicative of relative heaviness of the matter but the mass is indicative of relative heaviness.Hence, the given statement is false.
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Select all of the things are done to boats, cars, and planes in order to reduce friction.
The surface is polished.
The body is streamlined.
Special rivets are added.
They are built with sleek, tapering lines.
special rivets are added and they are built with sleek, tapering lines
Assuming a constant temperature which sample below would you expect to be at the highest pressure?
Boyle’s law
Explanation:The relationship between the volume and pressure of a given amount of gas at constant temperature was published by the Robert Boyle over 300 years ago. It is added in the statement now known as Boyle’s law: The volume of a given amount of gas held at constant temperature is inversely proportional to the pressure under which it is measured.So in this case temperature remain constant while pressure increased.
An unknown substance is heated from 10 °C to 25 °C. The table below shows the state of the substance at different temperatures.
Time
(minutes) Temperature of liquid
(degrees Celsius) State of matter
0 10 Solid
2 15 Solid
4 17
6 17
8 17
10 23 Liquid
12 25 Liquid
Which statement is correct about the unknown substance?
Its melting point is 17 °C.
Its melting point is 15 °C.
The substance sublimes at 15 °C.
The substance exists as a gas at 17 °C.
(This is science)
Answer:
Its melting point is 17 °C.
Explanation:
The melting point of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium.So, the melting point is 17 °C.
And this is shown in the figure attached.
Answer:
A
Explanation: this is science and I'm like dis guy
How many grams of NaCl are in 0.78 moles of NaCl? *
The molar mass of NaCl is 23 + 35.5 = 58.5 g/mol, so the mass of the sample ia 0.78 × 58.5 = 45.63 g.
There is 45.58 grams of NaCl in 0.78 moles
What are moles ?Moles is a measurement unit in Chemistry for measuring large number of molecules and atoms.
1 mole is equal to 6.022 * 10²³ atoms
It is calculated by dividing mass of the molecule/compound by Molar mass of the substance.
Mass of 1 mole of a substance = Molar mass of the substance
0.78 moles of NaCl = ? grams
1 mole of NaCl means 58.44 grams.
0.78 moles = 0.78 * 58.44
0.78 moles of NaCl = 45.58 grams of NaCl
Therefore there is 45.58 grams of NaCl in 0.78 moles.
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What natural factors do scientists study to understand long-term climate change? Check all that apply.
Earth’s position
pollen grains
tectonic activity
volcanic activity
solar energy
the answer is :
1)Earth’s position
3)tectonic activity
4)volcanic activity
5)solar energy
Answer:
it's the first,third,fourth,and the fifth.
Explanation:
The graph represents the sales data for a particular product. In which week were 8 units sold?
a.
3rd week
b.
4th week
c.
6th week
d.
9th week
Is there a graph presented?
I need to see it in order to answer.
in the morning a student puts a warm soda in a ice filled cooler.
he closes the cooler. at lunch the can of soda is colder. what happened to the total amount of energy in the cooler containing the can of soda and the ice?
basically all of the molecules in the can of soda started to stop moving due to the compression and change of temperature. the ice had frozen the molecules and which then made the can of soda nice and cold lol
The total amount of energy in the cooler remains the same. The warm soda transfers its heat energy to the ice, causing the soda to cool and the ice to melt. The cooler, soda, and water from the melted ice eventually reach a thermal equilibrium where they have the same temperature.
Explanation:In the scenario where a student puts a warm can of soda in a cooler filled with ice, the amount of thermal energy in the cooler's system changes due to the process of heat transfer. This process follows the second law of thermodynamics which stipulates that heat tends to flow from hotter objects to colder objects until they reach equilibrium.
In this case, the warmer soda will transfer its heat to the colder ice. During this process, the ice will absorb the heat without a rise in temperature until all of it has melted. This is because this absorbed energy is used to break the bonds holding the ice molecules together in a solid state, causing a phase change to liquid water.
Simultaneously, the soda can's temperature drops as it loses heat to the ice. Eventually, everything in the cooler—the soda, the melted ice water, and the air within—will reach the same temperature, marking the achievement of thermal equilibrium. Therefore, the total amount of energy in the cooler remains the same, it's just transferred (not lost or gained). The energy initially within the can of soda is transferred to the ice, and the overall rise in the cooler’s temperature represent this energy transfer.
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70pts!!!! Please help Give one example when it might be important to know how much gravitational potential energy is stored by an object. Why is it important?
because if you kick a ball say and i t has less it will not hit the ground as hard but if it does it will hit the ground harrder
Answer: kick a ball say and i t has less it will not hit the ground as hard but if it does it will hit the ground harrder
Explanation:
When benzoic acid (C6H5COOH) and magnesium hydroxide are mixed, water and magnesium benzoate are produced
When benzoic acid and magnesium hydroxide are mixed, water and magnesium benzoate are produced. This is a neutralization reaction where the acid and base react to form a salt and water.
Explanation:When benzoic acid (C6H5COOH) and magnesium hydroxide (Mg(OH)2) are mixed, water and magnesium benzoate (C14H10MgO4) are produced. This is a neutralization reaction where the acid and base react to form a salt and water. In this case, the benzoic acid acts as the acid and the magnesium hydroxide acts as the base. The reaction can be represented as:
C6H5COOH + Mg(OH)2 -> C14H10MgO4 + H2O
Both benzoic acid and magnesium hydroxide are dissolved in water in order for the reaction to occur. The resulting magnesium benzoate is a salt that is insoluble in water, so it precipitates out as a solid.
_Zn + _HCl _ZnCl2 +_H2 how many grams of HCl would react with 2.99 grams of Zn
seasonal variation on earth is due to the
The tilt of the Earth on its axis is what causes the seasons.
which term describes an educated guess based on observation and background research of a topic? a. conclusion b. hypothesis c. law D. theory
Answer:
The correct answer is option b. Hypothesis.
Explanation:
The hypothesis is an idea or a guess that is formulated on the observation of a problem or natural phenomenon which is based on prior knowledge or research.
The hypothesis is not a random guess and it is also not a well-sustained explanation, it lies in between. The hypothesis is generally formed to prove or test if it is true or not.
Thus, the correct answer is option - b. Hypothesis.
What is the definition of half life
maybe it when you do not know what is going to happen the future