The concentration of CH3OH in the solution is found by converting the given mass to moles and then dividing by the volume of the solution in liters, resulting in a concentration of approximately 1.7 M.
Explanation:To find the concentration of CH3OH in the solution, we first need to convert grams to moles. The molar mass of CH3OH (methanol) is approximately 32.04 g/mol, so you divide 12.5g by 32.04 g/mol to get the amount in moles: around 0.39 mol. Now, concentration is defined as the number of moles of solute (CH3OH in this case) per liter of solution. As the volume given is in mL, we need to convert it to liters by dividing 230 mL by 1000 to get 0.23 L. Finally, dividing the moles of CH3OH by the volume of the solution in liters gives the concentration in M (Molarity), which is about 1.7 M.
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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
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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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
Aqueous ammonium sulfate reacts with aqueous chromium(III) nitrate, forming aqueous ammonium nitrate and a precipitate of chromium(III) sulfate. Balance the equation for this reaction
Answer:
3(NH₄)₂SO₄(aq) + 2Cr(NO₃)₃(aq) → 6NH₄NO₃(aq) + Cr₂(SO₄)₃(s)↓
Explanation:
Aqueous ammonium sulfate reacts with aqueous chromium(III) nitrate, forming aqueous ammonium nitrate and a precipitate of chromium(III) sulfate according to the balanced equation:3(NH₄)₂SO₄(aq) + 2Cr(NO₃)₃(aq) → 6NH₄NO₃(aq) + Cr₂(SO₄)₃(s)↓
3.0 moles of ammonium sulfate reacts with 2.0 moles of chromium(III) nitrate, forming 6.0 moles of ammonium nitrate and 1.0 mole of chromium(III) sulfate.
Why did the beaker most likely feel warm
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 information does an empirical formula give ?
Im sure its D
Empirical formula has the lowest number (simplified) version in an equation of molecules
Which of the following elements have properties similar to those of astatine?
F, Br, l
Na, Mg, Al
Ar, S, P
F, Ar, Ne
F, Br, l
Explanation;Astatine is a member of the halogen family, elements in Group 17 (VIIA) of the periodic table.It is a highly radioactive element and it is the heaviest known halogen. Astatine is similar to the elements above it in Group 17 (VIIA) of the periodic table, especially iodine. One property of iodine is that it tends to collect in the thyroid gland .Answer:
F, Br, l
Explanation:
Astatine is radioactive element which has symbol, At and the atomic number of the element is 85.
It belongs to the group 17 and period 6.
The elements in the same group shows similar properties as they have same general electronic configuration.
So, it shows similar properties with group 17 elements which are - F, Cl , Br, l
Answer- A
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.
why is an energy pyramid shaped like a triangle with the point on the top?
The energy decreases as you move through the trophic levels from the bottom to the top of the energy pyramid. This is because the energy is used up by the organisms at each level. The pyramid shape is used to represent the flow of energy because of the way that energy is used up and lost throughout the system.
Answer:
The energy pyramid is one type of graphical representation of ecological relationships that is in the shape of a pyramid. The base must have the largest amount of biomass (shown as the widest bar) so it can support the energy requirements of the organisms at higher levels. Each higher level in the pyramid gets smaller (the bars get narrower) because only about 10% of the available energy transfers to the next level. The shape of the energy pyramid shows that there is enough biomass energy contained in the primary producers at the bottom to support the predators at the top, even though energy is lost at each level.
Explanation:
Carbon dioxide gas is produced by the reaction of oxygen gas and solid carbon . Write a balanced chemical equation for this reaction
The balanced chemical equation for the reaction of solid carbon with oxygen gas to produce carbon dioxide is C + O_2 → CO_2. The equation is balanced as per the law of conservation of mass.
Explanation:The balanced chemical reaction between oxygen gas and solid carbon to produce carbon dioxide is written as follows:
C + O_2 → CO_2
In this equation, 'C' represents solid carbon and 'O2' represents oxygen gas. On the reactant side of the equation, we have one atom of carbon and two atoms of oxygen. On the product side, we have one molecule of carbon dioxide which consists of one carbon atom and two oxygen atoms. This confirms that the equation is balanced according to the law of conservation of mass which states that the number of atoms of each element on the reactant side must be equal to the number of atoms of the same element on the product side in any given chemical reaction.
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Final answer:
Solid carbon reacts with oxygen gas to produce carbon dioxide gas, represented by the balanced chemical equation: [tex]C(s) + O2(g) - CO2(g).[/tex] The equation balances the number of atoms on both sides, conforming to the conservation of mass.
Explanation:
When solid carbon reacts with oxygen gas, the product is carbon dioxide gas. This reaction is an important example of a combustion reaction where carbon combines with oxygen to produce carbon dioxide. The balanced chemical equation for this reaction is:
[tex]C(s) + O2(g) - CO2(g)[/tex]
In this equation, the (s), (g), and (g) represent the physical states of the substances involved: solid, gas, and gas, respectively. It's vital to balance chemical equations to reflect the conservation of mass, indicating that the same number of atoms of each element react and are present in the products. In this case, one atom of carbon reacts with one molecule of oxygen (which consists of two atoms of oxygen) resulting in one molecule of carbon dioxide.
What causes water molecules to have the shape they have according to VSEPR theory
C) repulsive forces between specific lone pairs of electrons. the bond angle in a water molecule is bent.
Hope it helps :)
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
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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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.
seasonal variation on earth is due to the
The tilt of the Earth on its axis is what causes the seasons.
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:
Inferences are A. never made by scientists. B. questions that are made by studying conclusions or predictions. C. exactly the same as observations. D. conclusions or predictions that are made by studying observations.
The answer would be, D. because ive taken the test.
Conclusions or predictions that are made by studying observations , Option D is the correct answer.
What are Inferences ?Inferences are the conclusions that are drawn based on evidence and reasoning.
These are made on the data available and not after proper research.
Inference are correct if there is enough evidence to back it.
It is asked in the question that what are Inferences among the option given
It can be concluded that Option D , conclusions or predictions that are made by studying observations , is the correct answer.
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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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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
a 0.060 kilogram ice cube at 0.0 degrees celsius is placed in a glass containing 0.250 kilograms of water at 25 degrees celsius. which statement best describes this system when equilibrium is reached? (assume no external exchange of heat)
1. the ice is completely melted and the water temperature is above 0 degrees celsius
2. the ice is completely melted and the water temperature is 0 degrees Celsius
3. part of the ice remains frozen and the water temperature is above 0 degrees celsius
4. part of the ice remains frozen and the water temperature is 0 degrees celsius.
The ice is completely bmelted and the water temperature is above 0 degrees Celsius.
Answer:
The ice is completely melted and the water temperature is above 0 degrees celsius
Explanation:
The initial temperature of ice is 0 degree celsius.
the mass of ice is 0.060 kg
specific heat of ice = 2.108 kJ/kg K
specific heat of water = 4.184 kJ/kg K
mass of water = 0.250 kJ/kg K
initial temperature of water = 25 degree celsius
let final temperature of both ice and water = t degree celsius.
Now to reach this temperature, the ice will melt and the temperature of water will be above 0 degree celsius.
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.
(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.
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.
You burn a 1.5 g jellybean to warm 150 g of water. The temperature of the water increases by 15 °C. Water has a specific heat of 4.184 J/g • °C. How many joules does the jellybean have? A) 94.14 J B)941.4 J C)9414 J D)14124 J
Answer:
9414.0 J.
Explanation:
The amount of heat absorbed by water through burning a 1.5 g jellybean can be calculated from the relation:Q = m.c.ΔT.
where, Q is the amount of heat absorbed by water,
m is the mass of water (m = 150.0 g),
c is the specific heat of water (c = 4.184 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 15.0 °C).
∴ Q = m.c.ΔT = (150.0 g)(4.184 J/g °C)(15.0 °C) = 9414.0 J.
So, the jellybean have 9414.0 J that is releases to water.
I need help on what it is
There are 14 neutrons in Silicon. (neutrons are equivalent to the atomic number)
What is the definition of half life
maybe it when you do not know what is going to happen the future
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