A hockey player attempts to make goal by sliding the puck across frictionless ice, forces acting on the hockey puck as soon at it breaks contact with the stick is gravity.
What is meant by frictionless surface?Frictionless surface is surface with no resistance between a surface or substance and something that is moving along or through it.
As soon as hockey puck breaks contact with the stick, only force acting on the puck is the force of gravity. As the ice is assumed to be frictionless, there is no frictional force acting on puck.
Normal force, which is the force exerted by ice on the puck perpendicular to surface of the ice, cancels out the force of gravity in vertical direction, but it does not affect the motion of puck in the horizontal direction. And finally, there is no contact force acting on puck as it is no longer in contact with the stick.
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Turns moist red litmus paper blue?
Answer: No, moist red litmus paper does not turn blue.
Explanation:
Derive an expression for lowering of vapour pressure and molar mass of solute
The expression for lowering of vapour pressure and molar mass of solute is given as -
[tex]\frac{p^{0}- p }{p^{0} }[/tex] = [tex]\frac{W_{2} }{M_{2} }[/tex] × [tex]\frac{M_{1} }{W_{1} }[/tex]
What is Raoult's law?According to Raoult's law-
Relative lowering of vapour pressure of a non volatile solute is equal to the mole fraction of solute.
The relation between relative Lowering of vapour pressure and molar mass of solute is given as -
[tex]\frac{p^{0}- p }{p^{0} }[/tex] = [tex]\frac{W_{2} }{M_{2} }[/tex] × [tex]\frac{M_{1} }{W_{1} }[/tex]
where, [tex]p^{0}[/tex] = vapour pressure of pure solvent
p = vapour pressure of solution
[tex]W_{2}[/tex] = Mass of solvent
W₁ = mass of solute
M₂ = molar mass of solvent
M₁ = molar mass of solute.
Mole fraction of solute = [tex]\frac{n_{2} }{n_{1} + n_{2} }[/tex]
where, n₂ = number of moles of solvent
n₁ = number of moles of solute
For dilute solution, n₂ ∠∠n₁
Thus, n₂ can be neglected in the denominator and this gives,
[tex]\frac{p^{0}- p }{p^{0} }[/tex] = [tex]\frac{n_{2} }{n_{1} }[/tex]
We know that, number of moles = mass / molar mass.
Therefore replacing the values of n₂ and n₁ with mass and molar mass gives-
[tex]\frac{p^{0}- p }{p^{0} }[/tex] = [tex]\frac{W_{2} }{M_{2} }[/tex] × [tex]\frac{M_{1} }{W_{1} }[/tex]
Therefore, this gives the relation between relative lowering of vapour pressure and molar mass of solute
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Imagine you had the good fortune to find a meteorite in your backyard that appears to be a piece of material from the early history of the solar system. Quantitatively, how would you expect its ratio of potassium-40 and argon-40 to be different from that of other rocks in your yard? Explain why. The half-life for the decay of potassium-40 to argon-40 is 1. 25 billion years
The ratio of potassium-40 and argon-40 in the meteorite would be much higher than in other rocks in your yard.
It is because the meteorite is from the early history of the solar system, and thus has had much less time for the potassium-40 to decay into argon-40. This is due to the long half-life of potassium-40, which is 1.25 billion years. Therefore, the meteorite would still contain a large amount of potassium-40 relative to argon-40, whereas other rocks in your yard would have had much more time for the decay to occur, resulting in a lower ratio of potassium-40 to argon-40. This material was not subjected to the same processes that shape materials on Earth, such as weathering, erosion, and sedimentation.
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__________ is the use of high energy radiation to kill cancer cells.
A. Gamma sterilization
B. Radiotherapy
C. Medical imaging
D. None of these
Answer:
B. Radiotherapy
Explanation:
Radiotherapy is a medical treatment that uses high-energy radiation to destroy or shrink cancer cells. It is a common treatment for many types of cancer.
What is the pressure (in atmospheres) exerted by a 0.500 mol sample of N2 gas in a 10.0 L container at 298 K?
To solve this problem, we can use the Ideal Gas Law, which relates the pressure (P), volume (V), number of moles (n), and temperature (T) of a gas. The Ideal Gas Law is expressed as:
PV = nRT
where R is the gas constant.
R = 0.0821 L·atm/mol·K
We can rearrange this equation to solve for pressure:
P = nRT/V
where:
n = 0.500 mol (number of moles of N2 gas)
R = 0.0821 L·atm/mol·K (gas constant)
T = 298 K (temperature)
V = 10.0 L (volume)
Substituting the values:
P = (0.500 mol)(0.0821 L·atm/mol·K)(298 K)/(10.0 L)
P = 12.1 atm
Therefore, the pressure exerted by a 0.500 mol sample of N2 gas in a 10.0 L container at 298 K is 12.1 atm.
P4Br7 is…
A. Phosphorus bromide
B. Phosphorus (IV) bromide
C. Phosphorus heptabromide
D. Tetraphosphorus heptabromide
The correct name for P4Br7 is Tetraphosphorus heptabromide, which results from using prefixes to indicate the numbers of each type of atom present.
Explanation:The correct name for the compound P4Br7 is D. Tetraphosphorus heptabromide. In chemical naming, the prefix 'tetra-' is used for four of an atom, in this case, phosphorus. Similarly, 'hepta-' is the prefix for seven, referring to the seven bromide atoms present. Therefore the name becomes Tetraphosphorus heptabromide.
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Fuel pellets are used in modern energy-saving wood stoves. If the pellets used for these stoves release 742 cal/g, how many calories of energy will be released by the combustion of an entire
40-Ib sack of pellets?
YALL PLEASE HELP use unit analysis pls
We must first convert the fuel's weight from pounds to grammes because the energy release is specified per gramme. 18143.68 g is the result of multiplying 40 pounds by the weight in grammes per pound.
How many calories of energy will be released by the combustion of an entire40-Ib sack of pellets?We must first convert the fuel's weight from pounds to grammes because the energy release is specified per gramme. 18143.68 g is the result of multiplying 40 pounds by the weight in grammes per pound.
The total amount of energy released can then be determined by multiplying the mass of the pellets by the energy release per gramme:
18143.68 g x 742 cal/g equals 13462351.36 cal.
This outcome can be written as follows in scientific notation:
1.3462 x 10^7 cal
As a result, 1.3462 x 107 calories will be produced during the complete combustion of a 40-lb sack of pellets.
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1. (a) In your own words, define “flow rate” and “viscosity.”
(b) Describe the relationship between fl ow rate and
viscosity.
(A) Viscosity:the measure of how fast a fluid will flow the "thickness" of a fluid Flow Rate: the volume of fluid that passes a point in a pipe or tube in a certain amount of time.
(B) As Viscosity increases Flow Rate decreases :)
Honors Calorimetry Activity
In this activity, you will plan and conduct an investigation on energy transfers between two liquids of different temperatures.
Objective: Plan and then conduct an investigation on energy transfer between two liquids of different temperatures.
Materials: thermometer, two foam cups, measuring cup from your kitchen, hot water, and one liquid selected from the chart below and placed in your refrigerator for one or more hours before you begin your activity
Liquid
Heat capacity
(J/(g oC))
Density
Grape juice
3.6
1.06 g/mL
Whole milk
3.77
1.04 g/mL
Orange juice
3.73
1.05 g/mL
Tomato juice
3.98
1.03 g/mL
Caution: You will be working with hot water in this lab. Be very careful as you pour so you do not burn yourself. Also, be sure to read your thermometer carefully. The numbers on the thermometer scale refer to the line under the number. Lastly, it's important to perform certain steps quickly and efficiently to minimize heat loss to the surroundings.
Procedure:
Read the entire procedure before you begin the experiment.
Use the metric scale on your measuring cup to measure 237 mL (1 cup) of your selected refrigerated liquid. Pour this liquid into one of the foam cups.
Now, get the hottest water possible from the faucet on your sink. Use the metric scale on your measuring cup to measure 237 mL (1 cup) of hot water. Pour this water into the other foam cup.
Quickly measure the temperature of the cold liquid and the hot water. Record the temperatures in a data table.
Very quickly pour the hot water into the cold liquid. Place the thermometer in the
mixture. Invert the cup that contained the cold liquid over the cup containing the water mixture.
Keeping the bulb of the thermometer in the liquid, check the temperature reading about every 20 seconds until the temperature stabilizes. Keep the lid (inverted cup) in place as much as possible. When the temperature is constant (this will happen very quickly), record this temperature in a data table as the final temperature.
Data:
Create a data table of for your measurements and calculations. Two measurements are provided for you. Record the other measurements needed for this activity.
Volume of cold liquid
237 mL (1 cup)
Volume of hot water
237 mL (1 cup)
The energy transferred was 4,233.6 joules and the average temperature of the mixture was 50°C.
What is mixture?Mixture is a combination of two or more substances that are not chemically bonded together and can be separated easily through physical means. The components of a mixture might be solids, liquid, or gases. In a mixture, the substances maintain their own physical and chemical properties. Examples of mixtures include air, water, salad dressing, and trail mix. Both homogeneous and heterogeneous mixtures exist.
Temperature of cold liquid 10°C
Temperature of hot water 90°C
Temperature of mixture 40°C
Calculations: Using the data collected, calculate the amount of energy transferred and the average temperature of the mixture using the following equations:
Energy Transferred = Heat Capacity x Mass x Change in Temperature
Average Temperature of Mixture = (Initial Temperature of Cold Liquid
Initial Temperature of Hot Water) / 2
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Lana drew the diagram below to model asexual reproduction. Based on Lana's diagram, which statement explains the results of asexual reproduction? A. The offspring are not genetically identical to the parent, because each offspring receives only half of the chromosomes from a single parent. B. The offspring are not genetically identical to the parents, because two parents each contribute half of their chromosomes to each offspring. C. The offspring are genetically identical to the parent, because each offspring receives a complete copy of a single parent's chromosomes. D. The offspring are genetically identical to the parents, because two parents each contribute a complete copy of their chromosomes to each offspring.
Based on Lana's diagram, the correct statement that explains the results of asexual reproduction is C. The offspring are genetically identical to the parent, because each offspring receives a complete copy of a single parent's chromosomes.
What happens in asexual reproduction?In the diagram, the parent cell divides into two identical daughter cells, each of which contains a complete copy of the parent cell's genetic material.
This type of reproduction, where a single parent produces offspring that are genetically identical to itself, is called asexual reproduction. It is the process by which many unicellular organisms, such as bacteria and some protists, reproduce.
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Select the correct answer. Sam's height is 15 centimeters less than 2 times Martha's height. If Sam is 185 centimeters tall, and Martha's height is x, the relationship between the heights can be represented by the equation 2x − 15 = 185. What is Martha's height? A. 90 B. 95 C. 100 D. 105
Answer:
To solve the equation 2x − 15 = 185, we need to isolate x on one side of the equation.
Adding 15 to both sides gives:
2x = 200
Dividing both sides by 2 gives:
x = 100
Therefore, Martha's height is 100 centimeters.
The correct answer is (C) 100.
Explanation:
Answer:
C. 100
Explanation:
If Sam is 15 centimeters less than 2 times Martha's height and his height is 185.
185 is 15 centimeters less than 200 and 200/2 is 100
Martha is 100 centimeters.
Courtney burns wood in an outdoor firepit. She measures the mass of the ashes that remain after the fire, and the mass is much lower than the wood that she burned. What would be the best explanation for what Courtney observes?
A. gases are released into the air
B. water inside the wood solidifies
C. heat caused the molecules to lose density
D. atoms in the wood are destroyed
Courtney burns wood in an outdoor firepit and she measures mass of the ashes that remain after the fire, and mass is much lower than the wood that she burned. The best explanation for what Courtney observes is that: A. gases are released into the air.
What is the best explanation for what Courtney observes?When wood burns, it undergoes chemical reaction called combustion, where it reacts with oxygen from the air to produce carbon dioxide, water vapor and other gases. These gases are released into air as the wood burns and their mass is not accounted for in ashes left behind.
Water inside the wood may also be released as steam during combustion process but this would not explain the significant difference in mass between the wood and ashes.
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State what causes tides on Earth.
Answer: They result from the earth's gravitational pull from the moon and, to a lesser extent, the sun.
Explanation:
They result from the earth's gravitational pull from the moon and, to a lesser extent, the sun. A shore experiences a high tide when the wave's highest point, or the crest, reaches it. A coast experiences a low tide when the trough, or lowest point, approaches it.
If you put 10.0mL of a in one balance pan . How much mass of b would you need in the other pan to make it balanced
To balance 10.0 mL of substance a, we would need 6.67 g of substance b.
How did we arrive at the value?To determine how much mass of substance b would be needed to balance 10.0mL of substance a on the other pan, we need to know the density of both substances.
If we know the density of substance a and the volume of substance b, we can calculate the mass of substance b needed to balance the system.
For example, if we assume that substance a has a density of 1.0 g/mL, and we want to balance it with substance b which has a density of 1.5 g/mL, we can use the following formula:
mass of substance b = (density of substance a) x (volume of substance a) / (density of substance b)
Substituting the values given, we get:
mass of substance b = (1.0 g/mL) x (10.0 mL) / (1.5 g/mL)
mass of substance b = 6.67 g
Therefore, to balance 10.0 mL of substance a, we would need 6.67 g of substance b.
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If the Antarctic plate is estimated to move 2. 05 cm per year, how long did it take for the plate to move from point A to point B?
Answer:
They move at a rate of one to two inches (three to five centimeters) per year.
Explanation:
The movement of the plates creates three types of tectonic boundaries: convergent, where plates move into one another; divergent, where plates move apart; and transform, where plates move sideways in relation to each other.
Which part of this system is most greatly impacted when human activities release excessive amounts of carbon dioxide and other greenhouse gases into the atmosphere?
When human activities release excessive amounts of carbon dioxide and other greenhouse gases into the atmosphere, then atmosphere is most greatly impacted.
What are greenhouse gases?Greenhouse gases are gases the in the atmosphere of Earth that trap heat.
The greenhouse gases trap heat in the atmosphere and contribute to the phenomenon of global warming, which has numerous negative effects on the climate and environment.
Excessive greenhouse gas emissions can cause rising global temperatures, more frequent and severe weather events, sea level rise, ocean acidification, and other environmental changes that have significant impacts on ecosystems, agriculture and human societies. Therefore, it is important to reduce greenhouse gas emissions to mitigate the impacts of the climate change.
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Which of the following substances is insoluble in water, according to these solubility
rules?
Calcium hydroxide (Ca(OH)2)
Sodium chloride (NaCl)
Silver chloride (AgCl)
Potassium nitrate (KNO3)
Answer:
silver chloride
Explanation:
NOTE:
All nitrates are soluble in water
All sulphates are soluble in water apart from Barium sulphate and Lead (II) sulphate
All chlorides are soluble in water apart from Silver chloride and Lead (II) chloride
All hydroxides are soluble in water
Answer:
silver chloride
Explanation:
How does ionic and covalent compounds use electrons?
Answer:
In ionic bonding, atoms transfer electrons to each other. Ionic bonds require at least one electron donor and one electron acceptor. In contrast, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.
They share electrons between them
Pls I need help. Search the Lewis dot structure for water and ethanol and examine the structures and identify which part is partial negative and partial positive.
The Lewis dot structure for water is H-O-H. The oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.
What is structure?Structure is the arrangement of components within a system or object. It is the way in which individual parts are organized to form a whole. Structures can be physical, such as a building, or intangible, such as a system of government or an organization. Structures provide an orderly arrangement of components and help to keep the system functioning properly. By designing structures that are efficient, stable, and able to withstand external forces, engineers and architects are able to create safe and reliable structures.
The Lewis dot structure for ethanol is C-H-O-H. The oxygen atom has a partial negative charge, while the carbon and hydrogen atoms have partial positive charges.
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How many formula units are there in 4.80x10^-3 mol of NaI?
The number of formula units present in 4.80×10⁻³ mole of NaI is 2.89×10²¹ formula units
How do i determine the formula units present?From Avogadro's hypothesis, we understood that 1 mole of NaI contains 6.022×10²³ formula units as shown below
1 mole of NaI = 6.022×10²³ formula units
Therefore, we can obtain the formula units in 4.80×10⁻³ mole of NaI as follow:
Mole of NaI = 4.80×10⁻³ moleFormula units =?From Avogadro's hypothesis,
1 mole of NaI = 6.022×10²³ formula units
Therefore
4.80×10⁻³ mole of NaI = 4.80×10⁻³ × 6.022×10²³
4.80×10⁻³ mole of NaI = 2.89×10²¹ formula units
Thus, the formula units present is 2.89×10²¹ formula units
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What are the shortest waves in the electromagnetic spectrum?
But this is including microwave waves so would that be the shortest or?
Answer:Gamma rays
Explanation:Gamma Radiation has the shortest wavelength.Order is as follows (shortest to longest wavelength):Gamma, X-Rays, UV, Visible, Infrared, Microwaves, Radio Waves.Gamma has the shortest wavelength because it has a higher frequency, meaning more waves in a second than any other radiation, which results in the short wavelength.Frequency is inversely proportional to the wavelength, and because it has a short wavelength and high frequency it has the most energy out of the rest of the Electromagnetic Radiation Spectrum.Hope I helped :)
How many moles of KNO3 would have to be added to 100g of water to form a saturated solution at 10C?
According to the solubility graph of KNO₃, 0.160 moles would have to be added to 100 g of water to form a saturated solution at 10°C.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.
At 40°C 67 g potassium nitrate is soluble thus at 10°C 10×67/40= 16.25 g is soluble which is 16.25/101.10= 0.160 moles.
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Two methods that can analyze fibers are
a
Polarizing light spectroscopy and infrared microscopy
b
Polarizing light microscopy and infrared spectroscopy
c
None of the above
Answer:
b
Polarizing light microscopy and infrared spectroscopy
Explanation:
reflection
about balancing chemical equation
and molecular wiegth and mollar mass
and molecular ratio and moles of molecules / atoms/
pwede nyo bang gawin Lahat Yan ng reflection
combined all of that will be reflection
Balancing a chemical equation involves adjusting the coefficients in front of the reactants and products so that the number of atoms of each element is equal on both sides of the equation.
How do you balance chemical equations?Here is a general method for balancing chemical equations:
Write the unbalanced chemical equation, using chemical symbols and formulas to represent the reactants and products.
Count the number of atoms of each element on both sides of the equation.
Start by balancing the atoms of elements that occur in only one compound on each side of the equation.
Use coefficients to adjust the number of atoms of each element until they are equal on both sides of the equation.
Verify that the coefficients are in the lowest possible ratio and that the equation is balanced.
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Please Help!!!
4.6g of sucrose was added to 72.9g of water. What is the percent composition? Round to the tenths place.
Answer:
The percent composition by mass of a component in a mixture is given by:
percent composition = (mass of component / total mass of mixture) x 100%
In this case, the component is sucrose, and the total mass of the mixture is the sum of the mass of sucrose and the mass of water. We have:
mass of sucrose = 4.6 g mass of water = 72.9 g total mass of mixture = mass of sucrose + mass of water = 4.6 g + 72.9 g = 77.5 g
Substituting these values into the formula, we get:
percent composition of sucrose = (4.6 g / 77.5 g) x 100% = 5.94%
Rounding to the tenths place, we get:
percent composition of sucrose ≈ 5.9%
Therefore, the percent composition of sucrose in the mixture is approximately 5.9%.
i hope this helps you
What is the volume (in liters) of a 0.46 Molar solution made from 0.55 moles of potassium bromide? Round your answer to the nearest 0.01 and include
The volume of the solution is 1.20 liters.
What is volume?Volume is a measure of the amount of space that an object occupies. It is typically measured in cubic units such as cubic meters (m³), cubic centimeters (cm³), or cubic feet (ft³).
The volume of an object can be calculated by multiplying its length, width, and height or by using other formulas specific to the shape of the object.
To calculate the volume of a solution, we need to use the formula:
volume (in liters) = amount of solute (in moles) / concentration (in moles per liter)
In this case, we have:
Amount of solute = 0.55 moles
Concentration = 0.46 Molar
Using the formula above, we can calculate the volume of the solution as follows:
volume = 0.55 moles / 0.46 M = 1.20 L
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Predict what will happen to reaction rates in the following scenarios and explain why!
1. You add more oxygen gas to rusting iron metal (Note: Iron + Oxygen- →rust).
this reaction rate will...
2. You put a beaker of reacting nitric acid and sodium hydroxide into the refrigerator. This reaction rate will...
In the following chemical changes in case of rusting of iron reaction rate will increase while in case of nitric acid and sodium hydroxide into the refrigerator , reaction rate will decrease.
What are chemical changes?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
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5. When 5.20 g of chlorine is added to 8.7 of acetylene, C_{2}*H_{2} 3.86 g of 1,1,2,2-tetrachloroethane, C_{2}*H_{2}*C*l_{41} is formed: what is the limiting reagent? What is the present yield of this reaction
The limiting reagent in this reaction is chlorine. This is because it is present in the smallest amount of the reactants (5.20 g of chlorine compared to 8.7 g of acetylene).
What is chlorine ?Chlorine is a chemical element found on the periodic table with the atomic number of 17. It is a halogen and a powerful oxidizing agent, meaning it readily reacts and binds with other elements to form compounds. Chlorine is found in nature in the form of salt, which is a compound of chlorine and sodium. It is a greenish-yellow gas at room temperature, and it has a strong, distinct smell. Chlorine is widely used in industry and is found in many everyday products.
The theoretical yield of this reaction is 3.86 g of 1,1,2,2-tetrachloroethane. This is because the amount of chlorine present is enough to completely react with the acetylene, forming the maximum possible amount of 1,1,2,2-tetrachloroethane. The actual yield of the reaction is dependent on the efficiency of the reaction and the purity of the reactants.
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Which of the following statements is true about dilute and concentrated solutions?
Concentrated solutions have a higher solvent-to-solute ratio than dilute
solutions.
Concentrated solutions contain more solute than dilute solutions.
Dilute solutions contain more solute than concentrated solutions.
Dilute solutions have a higher solvent-to-solute ratio than concentrated
solutions.
Answer:
The statement that is true about dilute and concentrated solutions is: Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions.
Explanation:
In dilute solutions, the amount of solute is relatively low compared to the amount of solvent. Conversely, in concentrated solutions, the amount of solute is relatively high compared to the amount of solvent.
For example, if you add a teaspoon of sugar to a cup of water, you have a dilute solution. If you add five teaspoons of sugar to the same cup of water, you have a concentrated solution.
So, the correct statement is that dilute solutions have a higher solvent-to-solute ratio than concentrated solutions.
Answer:
Dilute solutions have a higher solvent-to-solute ratio than concentrated
solutions.
Explanation:
A compound has an empirical formula SN. If there are 4 atoms of N in one molecule, what is the molecular formula? Explain.
SN
1:1
So lf you multiply N with 4 you have to multiply the s with the same number
the answer Will be sS4N4
easy