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Related Questions
Distinguish between single and double replacement reactions and give an example of
each.
Answers
Answer:
i think this is right!
Explanation:
An example of a single replacement reaction occurs when potassium (K) reacts with water (H2O). A colorless solid compound named potassium hydroxide (KOH) forms, and hydrogen gas (H2) is set free. The equation for the reaction is: 2K + 2H2O → 2KOH + H.
An example of a double replacement reaction is the reaction between silver nitrate and sodium chloride in water. Both silver nitrate and sodium chloride are ionic compounds. Both reactants dissolve into their ions in aqueous solution.
what is ozen. gas? How is it formed?
Answers
[tex]\sf\huge\underline\purple{Ozone\: Gas:-}[/tex]
Ozone, O3, an unstable, blue, diamagnetic gas with a characteristic pungent odor, protects the earth and its inhabitants from intense ultraviolet radiation from the sun.[tex]\rightarrow[/tex]Ozone is an allotropic molecular form of oxygen containing three atoms of oxygen (O3). Ozone O3 is generated through the passage of oxygen O2 through a high voltage potential resulting in the attachment and formation of a third oxygen atom.
[tex]\rightarrow[/tex]The molecular formula for ozone (O3) was established by Soret (1863) by taking the ratio of the change in volumes when O3/O2 mixtures were either heated or exposed to turpentine and cinnamon oil.
Formation:-[tex]\rightarrow[/tex]Ozone is formed when heat and sunlight cause chemical reactions between oxides of nitrogen (NOX ) and Volatile Organic Compounds (VOC), which are also known as Hydrocarbons. This reaction can occur both near the ground and high in the atmosphere.
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Hope it helps you:)
How many grams are in 4.80 mol of sodium chloride ( NaCl )?
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[tex]w = \text{Number of mols} \times \text{Molar mass}=4.8 \times 58.5=280.8~ g[/tex]
We know,
Molar Mass of Sodium= 23 and,
Molar Mass of Chlorine= 35.45
[tex] \therefore \text{Molar Mass of Sodium chloride= 58.44 }\text{g/mol}[/tex]
So, The Molar Mass in Grams=
[tex]58.44 \frac{\text{g}}{ \cancel\text {mol}} \times 4.80 \: \cancel\text{mol} \\ \\ \text{Mass of NaCl }= 280.51\: \text {gram}[/tex]
Hope This Helps!!Name and Describe two properties of water that’s important to life on earth
Answers
"The Univeral Solvent"
- Water is known to be the universal solvent because of its ability to dissolve more particles than any other liquid.
Cohesion- Cohesion is the property of water to attract other molecules. This helps in making solutions that are essential for most life to propagate.
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How can you get a real gas to behave like the LEAST like an ideal gas (minimize attraction between particles)?
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A real gas behaves least like an ideal gas under the conditions of low temperature and high pressure.
This is because at low temperature and high pressure molecules of gas will have negligible kinetic energy and strong force of attraction. Thus, real gas will not behave like an ideal gas.
Whereas at high temperature and low pressure a real gas will behave like an ideal gas.
Answer: No real gas is ideal. All molecules have a volume and intermolecular forces of attraction. So a "real molar volume" is different from an ideal molar volume.
Explanation: I hope this help
A gas is formed in the reaction shown below. The gas laws can help determine the volume of gas produced.
Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)
Assume that 130.8 grams of Zn was used in this reaction. To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used. What quantity in moles of Zn were used?
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Considering the definition of molar mass, the number of moles of Zn reactant used is 2 moles.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Number of moles of Zn usedThe balanced reaction is:
Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)
Assume that 130.8 grams of Zn was used in this reaction.
To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used.
So to determine the number of moles used you know that the molar mass of Zn is 65.37[tex]\frac{g}{moles}[/tex]. Then:
[tex]molar mass=\frac{mass}{number of moles}[/tex]
[tex]65.37\frac{g}{moles} =\frac{130.8 g}{number of moles}[/tex]
Solving:
number of moles× 65.37[tex]\frac{g}{moles}[/tex]= 130.8 g
[tex]number of moles=\frac{130.8 g}{65.37\frac{g}{moles}}[/tex]
number of moles≅ 2 moles
Finally, the number of moles of Zn reactant used is 2 moles.
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A(n) reaction is a self-sustaining series of chemical reactions in which the products of one reaction are the reactants in the next reaction.
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The reaction which is a self-sustaining series of chemical reactions in which the products of one reaction are the reactants in the next reaction is chain reactions.
What are reactants and products?Reactants are those species which are present at the initial state of the reaction and at the end of the reaction we obtain products.
If in any chemical reactions, reactants are combined for the formation of products and for the further process obtained product will act as reactant and that chemical reactions are known as chain reactions. Because this process continues for long time.
Hence correct option is chain reactions.
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Answer:
chain
Explanation:
edge 2023
Does gravity give objects their mass
Answers
Answer:
No
Explanation:
Mass affects the amount of gravity that acts on an object.
Answer:
Mass is determined by the quantity of matter in a physical object.
Mass is how much space something takes up, while weight is how much an object is acted on by a force because of gravity.
Explanation:
Gravity does not determine the mass of an object. For example, an object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. This is because weight is a force, while mass is the property that determines the strength of this force.
What are the forms of energy that are transfer from the abiotic factors to the biotic factors and back to the abiotic factors of an ecosystem
Answers
Answer:
sunlight, light energy from the sun
Explanation:
energy is transferred from the sun to plants then animal's eat plants
An impure sample of potassium hydrogen phthalate was titrated to determine the percent composition KHP. What is the percentage of potassium hydrogen phthalate if 2.81 g of the mixture required 35.61 mL of 0.152 mol/L NaOH to reach the end point
Answers
For an impure sample of potassium hydrogen phthalate, the percentage of potassium hydrogen phthalate is
m'=39.3%
What is the percentage of potassium hydrogen phthalate if 2.81 g of the mixture required 35.61 mL of 0.152 mol/L NaOH to reach the end point?Generally, the equation for the mol base is mathematically given as
mol base = M*V
mol base = 0.152*35.61
mol base = 5.41272 mmol
In conclusion
mass = mmol/1000*MW
m== 5.41272 /1000*204.22
m= 1.1053 g of KHP
Hence, m'=39.3%
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Contrast (Compare) the Sun's gravitational pull on Earth when Earth is
closest to the Sun and when Earth is farthest from the sun.
Answers
Answer:
gravity equation.
Explanation:
use this gravity equation
F= G(m1*m2/d²)
please help
If the colored spheres represent different solute particles, based on the principles of osmosis, in which overall direction is water (not pictured) most likely to move?
A.
Water will move into the cell.
B.
Water will not move into or out of the cell.
C.
Water will move into and out of the cell equally.
D.
Water will move out of the cell.
Answers
If the colored spheres are solutes, the overall direction of water would be out of the cell based on the principle of osmosis.
What is osmosisIt is the movement of water molecules from the region of high water potential (low solutes) to the region of low water potential (high solute) through a selectively permeable membrane.
In the illustration, there are more colored spheres outside of the cell than inside of it. This means that there are more solutes outside the cell (lower water potential) than inside of the cell (higher water potential).
Thus, water will move from the inside of the cell to the outside until an equilibrium is established.
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Question 6 of 10
What does it mean when a reaction is spontaneous?
O
A. The reaction requires added energy.
B. The reaction goes to completion.
C. The reaction occurs rapidly.
O O
D. The reaction happens by itself.
SUBMIT
Answers
Answer:
D
Explanation:
Does not require energy ...may be slow or fast....
what is the pH of 3.65 grams of HCl dissolved in 1250 mL distilled H2O
Answers
Considering the definition of pH, the pH of 3.65 grams of HCl dissolved in 1250 mL distilled H₂O is 1.0969.
Definition of pHpH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]
The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
Concentration of HClMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
In this case, you know:
number of moles=[tex]3.65 grams x\frac{1 mole}{36.45 grams} =[/tex] 0.1 moles (being 36.45 g/mole the molar mass of HCl)volume= 1250 mL= 1.250 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
[tex]Molarity=\frac{0.1 moles}{1.250 L}[/tex]
Solving:
Molarity= 0.08 [tex]\frac{moles}{liter}[/tex]= 0.08 M
pH of the solutionHydrochloric acid is a strong acid, so in aqueous solution it will be totally dissociated. So the concentration of protons is equal to the initial concentration of acid. This is: [H⁺]= [HCl]= 0.08 M
Replacing in the definition of pH:
pH= - log (0.08 M)
Solving:
pH= 1.0969
Finally, the pH of 3.65 grams of HCl dissolved in 1250 mL distilled H₂O is 1.0969.
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A small sample of methane burns, producing co2 and water vapor. as the hot gas mixture expands, it releases 120.0 kj of heat and does 830.0 kj of work pushing against a piston. what is the total amount of energy released in this reaction
Answers
A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
What is energy?Energy is a property that is transferred to a physical system, recognizable in the performance of work and in the form of heat and light.
A small sample of methane undergoes combustion. As the hot gas mixture expands, it releases energy (E).
It releases 120.0 kJ of heat. By convention, when heat is released, we assign it a negative sign. Thus, q = -120.0 kJ.It does 830.0 kJ of work. By convention, when the system does work on the surroundings, we assign it a negative sign. Thus, w = -830.0 kJ.The change in the energy is the sum of the heat released and the work done.
ΔE = q + w = -120.0 kJ + (-830.0 kJ) = -950.0 kJ
A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
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At what age did Lavoisier die?
Answers
Answer:
50 years old
Explanation:
Antoine Lavoisier died by the guillotine at the age of 50 on May 8, 1794 in Paris.
Hope this helps...
- profparis
Answer:
Antoine Lavoisier died at the age of 50
4. One mole of H2O has a mass of 18g. How many moles of H,0 are there in 54g of
H2O?
Answers
Answer: 3 moles
Explanation: Divide 54 by 18 to get 3.
help I would really appreciate it tyy!!
Answers
Answer:
This image attached should help:
Explanation:
The reason that food web contains all organisms is because it shows every relationship, where food chain shows a more basic one. And the reason that they both have producers, consumers, and decomposers, is because they bothat least highlight a part of the almost every aspect, although it leans more to food web.
here's the answer to the question in the image, I couldn't comment on the right question because a bot already did.
1. ant, love
active
2. dog, man
dormant
3. bug, ring
burning
4. dress, up
pressure
5. think, tiger
trinker
A person sitting in a rolling chair at rest throws a basketball forward. Since the person and the rolling chair have a greater mass than the basketball, how will the person and the rolling chair respond?
They will have the same forward momentum as the basketball.
They will move backward at a lower speed than the basketball moves forward.
They will move backward at a higher speed than the basketball moves forward.
They will travel the same distance as the basketball travels but in the opposite direction
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They will move backward at a lower speed than the basketball moves forward.
Conservation of linear momentumThe principle of conservation of linear momentum states that the sum of the initial momentum is equal to sum of final momentum.
Initial momentum = Final momentum
The forward momentum of the basketball = Backward momentum of the person and the chair
Since the mass of the person and the chair is greater than the mass of the basketball, the person and the rolling chair will move backward at a lower speed than the basketball moves forward.
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Predict the sign of delta H for a combustion reaction and suggest whether it is likely to be spontaneous or not.
A) + and spontaneous
B) + and uncertain
C) - and spontaneous
D) - and uncertain
Answers
What's a combustion
It means hydrocarbon burns in presence of excess oxygen to produce carbon dioxide and heat
Hence it's exothermic∆H=+veAs solid state is converted to gaseous so randomness increases hence it's spontaneous
Combustion is the process of combining with oxygen to form water and carbon dioxide. It is an exothermic reaction and will release energy. Thus delta H for combustion is negative.
What is enthalpy change ?Enthalpy change of reaction is the change in heat absorbed or released by a reaction. If heat is absorbed by the system , the reaction is called endothermic and the change in enthalpy delta H is positive.
For a reaction which release energy, the change in enthalpy delta H will be negative and thus the reaction is said to be exothermic. Combustion is an exothermic reaction.
During combustion new bonds are formed between carbon and oxygen and carbon and hydrogen. Thus bond making is happend more than bond breaking. Bond breaking needs much energy than bond making.
Hence, the released energy is more form combustion and enthalpy change is negative. The process needs no more energy thus the reaction is spontaneous. Thus option C is correct.
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Calculate: Describe the RGB value and color you would obtain with each combination described below. Use the Gizmo to check your answers.
RGB value Color
Yellow (255, 255, 0) and blue (0, 0, 255) ______________ ______________
Plum (120, 0, 120) and dark green (0, 120, 0) ______________ ______________
Teal (0, 90, 90) and bronze (185, 150, 0) ______________ ______________
Answers
In the RGB color model, each color is represented by a numerical code that is written in parentheses and separated by commas.
What is the RGB model?RGB is a color model with which it is possible to represent a color by mixing by adding the three primary colors of light.
A special feature of this model is that it is not a reference point for defining the color red, green, or blue because the same RGB values can display noticeably different colors on different devices.
To form a color, it must be taken into account that in the RGB model the incidence of each color (red, green or blue) is measured on a scale that goes from 0 to 255.
These values are represented in parentheses, separated by commas as shown in the image below:
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Which of the following is a reasonable explanation for the effect that stirring or agitation has on the dissolution rate?
A.
The water molecules have more kinetic energy and have a greater chance of interacting with (and dissolving) the potassium iodide.
B.
The water molecules have an increased charge, since stirring removes electrons from the molecules. This increases the chance of a potassium ion being attracted to water.
C.
Stirring converts large amounts of energy into heat from friction and the heat increases the dissolution rate.
D.
Stirring breaks the bonds between water molecules so that they are free to bond with the potassium and iodine ions.
Answers
The water molecules have more kinetic energy and have a greater chance of interacting with (and dissolving) the potassium iodide.
What is the effect of stirring on the dissolution rate?Stirring breaks a solute into smaller pieces which increases its surface area as well as its rate of dissolution. Stirring brings unused portions of the solvent in contact with the solute which allows the solute to dissolve faster.
So we can conclude that option A is the right answer.
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two protons are placed 1 mm apart. separately two electrons are placed 1 cm apart. which pair will have greater force between them
Answers
Answer:
The protons
Explanation:
The force of attraction/repulsion is indirectly proportional to the square of the distance between...the protons are much closer together and will have a stronger force.
F = k q1q2 / r^2
Is Iron rusting a physical, or chemical change?
Answers
Answer:
the answer is chemical change because the act of rusting changes the substance of iron
Explanation:
help me with this pleaseeeeeee
Answers
Magnesium oxide is an ionic compound with a very high melting point and which requires a large amount of energy for melting.
What are ionic compounds?Ionic compounds are compounds which are formed between oppositely charged ions which are held together by electrostatic forces of attraction between the oppositely charged ions.
Ionic compounds are formed when metal atoms donate electrons to non-metals atoms to form ions.
Magnesium oxide is an ionic compound.
The nature of bonding is ionic bonding.
It has a crystalline lattice structure.
The forces of attraction is electrostatic forces of attraction.
It has a high melting point of 2,852 °C, and thus requires a large amount of energy go melting to occur.
Therefore, magnesium oxide is an ionic compound which requires a large amount of energy for melting.
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Answer the amount of miles of O2
Answers
Answer:
3
Explanation:
the answer is 3 because it is 3 for the o2 so 3 you have to pay more attention for the small ditails
Pots A and B both have plain soil, bean seeds, and the same amount of light. Pot B receives more water (see table). After 50 days the plants are measured. Based on the data, which of the following conclusions can NOT be drawn from the data table?
A plant that receives more water will have more mass
The amount of water a plant receives affects its growth
The taller a plant is, the more mass it has
A plant that receives more water will grow t
Answers
A. water per day: 20 m/ height: 24cm/ mass: 3.1g B. Water per day: 60 ml/ height: 24cm/ mass: 9.6g
I think that the answer to this question is the third option. These two plants are of the same height but plant B has more mass. So therefore the statement is not true.
If this is a multiple-choice, then I would also select the fourth option along with the third. Plant B received more water, but it is the same height as plant A.
I hope my answer is satisfactory, and that I was of help to you.
-Toremi
what mass of CO2 gas occupies 6.7L at 2 atm and 245k
Answers
What volume of water is used to prepare a 3.5 M solution if 45 grams of Na2CO3 is used?
Answers
Answer:
121.3 ml
Explanation:
Mole wts
Na 22.989 x 2
C 12.011
O 15.999 x 3 total = 105.986
45 grams is 45/105.986 of a mole
45/105.986 in one liter would be .424584 M
.424585 mole / x liter = 3.5
x = .1213 liter = 121.3 ml
Need help! Will give brainliest & 50 points.
What happens to iron when it reacts with acid?
Answers
Answer:
Iron will disolve in acid. The acid eats away at the iron. :)
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