Answer:
physical change
Explanation:
bcoz we make salad with raw vegetables and fruits
The salad is a physical change.
Making a fruit salad with raw fruits is a physical change because in this process chemical composition of fruits is not changed.
Telling the difference between a chemical change and a physical change seems trickier than it is. The main difference between a chemical change and a physical change is what happens to a substance’s composition. Here are the basic definitions of chemical and physical changes:
chemical change – a process in which chemical bonds are broken or created to make a new substance
physical change – a process in which a substance changes its state of matter, but chemical bonds stay intact
When matter undergoes a chemical change, it can’t return to its original state without additional reactions. But when it undergoes a physical change, it only needs to return to its original state of matter. The molecules of the substance haven’t been changed at all.
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Initially, 0. 700 mol of A i preent in a 2. 50 L olution. 2A(aq)↽−−⇀2B(aq)C(aq) At equilibrium, 0. 200 mol of C i preent. Calculate K
Chemists employ the mole, a very significant unit of measurement. The initial SO3 concentration is 0.28 M.
Explain about the moles?A mole is defined as 6.02214076 1023 of a particular chemical unit, such as atoms, molecules, ions, or others. Because there are so many atoms, molecules, or other components in any compound, the mole is a useful quantity to utilize.
When an element's standard relative atomic mass is multiplied by the molar mass constant, 1 103 kg/mol = 1 g/mol, the result is the molar mass of its atoms.
An object's mass that comprises 6.023 x 1023 of that object's particles is referred to as a mole. The SI unit used to measure substance amounts is the mole. Molecule is its symbol. According to the definition, 1 mole of carbon-12 weighs 12 grams and has a carbon atom count of 6.022140857 x 1023.
2.50 L is the container's volume.
Initially, there were 0.700 moles.
first concentration of SO3 =0.700 moles /2.50 L
SO3 = 0.28 M
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Which of these statements is one of the conclusions that formed the basis of dalton’s atomic theory?.
The correct answer is option D.
The statement that formed the basis of Dalton’s atomic theory is atoms are the smallest particles of matter and cannot be divided farther.
In 1808, Dalton presented a theory named atomic theory which suggests that atoms are the smallest particles of an element and it is impossible to divide them further.
According to his theory every element is composed of these tiny particles.
Furthermore, his theory suggests that atoms neither can be divided nor destroyed.
In a particular matter, for example gold, all atoms have similar properties while their mass varies for every single different element.
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The complete question is:
Which of these statements is one of the conclusions that formed the basis of Dalton’s atomic theory?
a. Atoms can only change into atoms of another element through nuclear reactions.
b. Atoms of gases have less mass than atoms of liquids and solids.
c. Atoms of a particular element all have the same number of protons.
d. Atoms are the smallest particles of matter and cannot be divided farther.
which property is a chemical property of a substance
Answer:
reactivity, flammability,toxicity some more
If the students replaced the rocket with one that has DOUBLE the MASS,
what would expect to see in the motion of the rocket?
Answer:
nothing common dude
In an isolated system, two copper bars at different temperatures transfer energy until both are at the same temperature How would the transfer of energy be difñerent if the bars were in an open system?
The copper bars and the surrounds would transfer energy energy be different if the bars were in an open system.
What is isolated system with example?Systems that are isolated are ones whose energy is constant at all times. Heat is neither generated nor absorbed in isolated systems. An illustration of such an isolated system Thermos flasks are the ideal illustration of isolated systems. There is neither a gain nor a loss of energy because the thermally flask is completely insulated.
Are isolated and isothermal systems similar?As a result, isothermal processes are not able to occur in closed systems. Q. In a thermodynamics cycle, the unit is in contact with an outside source of heat, and changes happen gradually to make regulating the temperature easier. An adiabatic process isolates the system.
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2. What is the frequency of an electromagnetic wave that has an energy of 9.89 x 10-18 J?
a. Known values:
b. Equation:
C. Work:
d. Answer:
The frequency of electromagnetic waves with an energy of 9.89×10-18 J is 1.492 ×10^16 Hz.
What are electromagnetic waves?
These are the waves created due to the vibration caused between two fields, i.e., electric field and magnetic field.
In simple words, it originates from the oscillating magnetic and electric field. The electromagnetic spectrum gives us a range of frequency, wavelength and Energies.
It is used to classify the electromagnetic waves and arrange them according to their order of frequencies and wavelength.
Frequency = Energy/ Planck's constant
f= E/h
h=6.626×10^-34 J s
⇒9.89×10^-18/6.626×10^-34
⇒1.492×10^16 Hz.
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an 11.0 gram sample of cacl2 is dissolved in 125 g of water with both substances at 25.0 c. calculate the final tmeperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18j/gc
40.4 C
So far q(rxn) = q(water) + q(CaCl2) (136g)(4.184J/°Cg)(Tfinal - 25.0°C) = (125g)(4.184)(Tfinal - 25.0°c) + (11g)c(Tfinal - 25.0°C).
The specific heat capacity is measured in J/(kg K) or J/(kg °C), and it is the amount of heat (J) absorbed per unit mass (kg) of the material when its temperature rises by 1 K (or 1 °C).The average kinetic energy of the atoms or molecules in the system is measured by temperatures. The zeroth law of thermodynamics states that when two objects are in thermal equilibrium, no heat is transferred between them, resulting in an equalisation of their temperatures.
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The distance of a doorknob from the floor is about 1
The ideal distance between a doorknob and the the ground floor is 34 inches.
How far should a doorknob and floor?In a lay man language, a doorknob simply refers to the handle which is usually used to hold doors in order to open or close the door. Every door of a building regardless of its size or location in the building must have a knob to always hold it with .
However, from the task given above, a doorknob should be at least 34 inches from the floor under normal circumstances.
In conclusion, it can be deduced from the simple explanation above that a doorknob should be ideally 34 inches from the floor of the house or building.
Complete question:
What should be the ideal distance between the doorknob from the floor?
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Gneiss is formed. The mineral grains in granite are flattened under pressure. Tell which event would occur first
When the mineral grains flatten and align in parallel bands, a type of metamorphic rock called gneiss is created. It is a rock with mineral grains made up of a variety of minerals.
such as graphite and quartz. High pressure and heat are used to form it. One popular and often found category of metamorphic rock is gneiss. It is created by igneous or sedimentary rock formations that have undergone metamorphic processes at high temperatures and pressure. In contrast to schist, gneiss forms at higher temperatures and pressures.
Compounds found only in living things are typically not considered minerals according to geological definitions. But other mineral grains, like calcite, are frequently biogenic is classified as organic molecules (such as mellite ).
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a soluble iodide was dissolved in water. then an excess of silver nitrate, , was added to precipitate all of the iodide ion as silver iodide, . if g of the soluble iodide gave g of silver iodide, how many grams of iodine are in the sample of soluble iodide? what is the mass percentage of iodine, , in the compound?
Answer:
a: 1.181grams of iodine are present in the sample of soluble iodide.
b: 76.44 percent iodine is the mass percentage of iodine when excess silver nitrate was added to precipitate all of the iodide ions
Explanation:
We know that when silver reacts with halides it forms precipitate, silver when reacts with iodine it forms a yellow coloured precipitate of silver iodide which is an inorganic compound soluble in water. One odd characteristic of silver iodide is that it is photosensitive and may form metallic/dark silver if exposed to light. One of the most renowned albeit controversial use of silver iodide is that it is used to generate rain through clouds
Ag+ (aqueous)+ I−(aqueous) →AgI(s) yellow precipitate
2.185g x (1 mole of AgI / 234.77 AgI) x (1 mole Iodine/1 mole AgI) x (126g of Iodine/1 mole of I)
= 1.181g
b)Now, mass percentage can be obtained by using the following formula
mass percentage = mass of solute/mass of solution x 100
iodine mass percent = (mass of iodine/mass of soluble iodide) x 100
= (1.181/1.545) x 100 = 76.44 %
mass percentage is the mass of the element/solute divided by the mass of compound or solution ,then the result is multiplied to get the answer. It can be defined as the weight of solute in a particular weight of solution.
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ammonium perchlorate is the solid rocket fuel that was used by the u.s. space shuttle and is used in the space launch system (sls) of the artemis rocket. it reacts with itself to produce nitrogen gas , chlorine gas , oxygen gas , water , and a great deal of energy. what mass of oxygen gas is produced by the reaction of of ammonium perchlorate? be sure your answer has the correct number of significant digits.
The numerical coefficients in a balanced chemical process describe the species-mole ratio. This mole ratio is used to compare two species' chemical compositions.
Take into account the balanced reaction for ammonium perchlorate's breakdown:
2 → N₂ + Cl₂ + 4H₂O + 2O₂
We can see from the aforementioned reaction that the amount of ammonium perchlorate that will react and the amount of oxygen gas that will be created are equal. Using the molar mass of 117.49 g/mol to calculate the moles of ammonium perchlorate
moles NH₄ClO₄ = 4.4 g / (117.49 g/mol) = 0.03745 mol
moles O₂ = 0.03745 mol
The oxygen gas moles will then be converted to mass (molar mass = 32 g/mol).
mass O₂ = 0.03745 mol * 32 g/mol = 1.2 g.
Therefore, the mass of oxygen gas produced by the reaction of ammonium perchlorate is 1.2 grams.
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COMPLETE QUESTION:
Ammonium perchlorate, NH₄ClO₄, is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen gas N₂, chlorine gas Cl₂, oxygen gas O₂, water H₂O, and a great deal of energy. What mass of oxygen gas is produced by the reaction of 4.4g of ammonium perchlorate?
what is the heat of a reaction, in joules, with a total reaction mixture volume of 70.6 ml if the reaction causes a temperature change of 6.1 oc in a calorimeter? assume that the reaction mixture has a density of 1.00 g/ml and a specific heat of 4.184 j/g-oc. the calorimeter has a heat capacity of 10.0 j/oc.
With density 1.00 g/ml and a specific heat of 4.184 j/g we can see that the heat of the chemical reaction in joules is H = 1,596 J
We are given
Total volume of the mixture = 70.6 ml
Change in temperature = 6.1 °C
Density of reaction mixture = 1.00 g/ml
Specific heat of water = 4.184 J/g = 4200 J/Kg
Now Density = mass/volume
Mass of water = Density × volume
Mass of water = 1 g/mL × 62.3 mL
Now in order to find heat in joules, let's use the formula.
H = mcθ
m = mass of water
c = heat capacity of water
θ = temperature rise
Now substituting the values we get
H = 0.0623 Kg × 4200 J/Kg × 6.1 °C
H = 1,596 J = 1.5 KJ
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1. Which of the following gas samples contains the largest number of molecules?
(A) 12 g of He (molar mass=4)
(B) 14 g of N₂ (molar mass=28)
(C) 34 g of NH3 (molar mass= 17)
(D)88 g of CO₂ (molar mass = 44)
The molar mass of the gas samples must be known to find the greatest concentration of molecules.
What is a molar mass?
A substance's molar mass is its mass in grams per mole of the chemical. A mole measures a substance's quantity of atoms, molecules, or ions. A mole is 6.022 1023 molecules of any given chemical.
Molar Mass calculation formula
M=m/n
M= molar mass
m=mass of substances (in grams).
n= number of moles of a substance.
How is molar mass determined, and why is it important?
One mole of material is weighed to determine its molar mass. Add the masses of all the components in a molecule to determine the molecular mass of the molecule by multiplying the subscript (number of atoms) by the atomic mass of each element in the molecule.
Using the molar mass formula,
M= 12/4 = 3,
It can be determined that 3 moles (or 3*avogadro number of molecules) are present.
Hence we can conclude that option (a) is correct.
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On US Interstate system, the maximum speed is 121km/h. How far will you travel if you
maintained this speed for 3 hours and 20 minutes?
The distance that will be traveled by me on the US interstate system will be 403.3 km.
What is distance?Distance is the total length between two points. Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.
To calculate the distance traveled;
d = Vt
Where;
d = Distance traveled by me
V = Maximum speed
t = Time
Given:
V = 121 km/h
t = 3 hours 20 minute = 10/3 hours
Substituting the values in the formula
d = 121×10/3
d = 403.3 km
In conclusion, the distance traveled by me will be 403.3 km.
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For an electron to change from an excited state to a ground state, it must
Answer:
An atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption. The electron absorbs the energy and jumps to a higher energy level. In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed.
one gram of cd(oh)2(s) is then dispersed in 1.0 l of the solution containing 1 mg/l of cd2 . once the system reaches equilibrium, what is the concentration of cd2 ?
The concentration of Cd⁺² is 8.8×10⁻⁶mol/lit.
What does the term equilibrium mean?When there is no tendency for reactant and product quantities to fluctuate, a chemical reaction is in equilibrium. It is up to us to decide which components of a chemical reaction are deemed reactants and which are products, as well as the direction in which we write about them.
Cd(OH)₂ → Cd⁺² +2OH⁻
↓
1mg/lit
Mass of Cd⁺² ⇒ 1mg/L×1 lit
Mass of Cd⁺² ⇒ 10⁻³gm
Mole of Cd⁺² → 10⁻³/112.4g/mol
Mole of Cd⁺² → 0.0088×10⁻³
Volume of Cd⁺² → 1Lit
Concentration of Cd⁺² →0.0088×10⁻³/1
Concentration of Cd⁺² → 8.8×10⁻⁶mol/lit.
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a solution is made by dissolving 21.5 g of sodium chloride, nacl, in enough water to make exactly 100 ml of solution. what is the concentration (molarity) of nacl in mol/l?\
The concentration molarity of NaCl is 3.76 mol/l.
The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of solution.
Calculation:-
mass = 21.5 g
volume = 100 ml = 0.1 L
the molar mass of NaCl = 58.5
mole = mass/molar mass
= 21.5 / 58.5
= 0.376
concentration = mole /volume
= 0.376 / 0.1
= 3.76
The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.
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calculate the heat (q) in kj released with combustion of methanol using 801 grams of water and the change in temperature is 4.3 degree celsius. the specific heat of water is 4.18 j/(g*c).
The heat (q) in kJ released with combustion of methanol using 801 grams of water and the change in temperature is 4.3 degree Celsius. the specific heat of water is 4.18 J/(g °C) is 14397.17 J.
given that :
The specific heat capacity is given as :
q = mc ΔT
where ,
m = mass = 801 g
c = specific heat capacity = 4.18 J/g °C
ΔT = change in temperature = 4.3 °C
q = heat = ?
now, by solving the values we get :
q = mc ΔT
q = 801 × 4.18 × 4.3
q = 14397.17 J
Thus, The heat (q) in kJ released with combustion of methanol using 801 grams of water and the change in temperature is 4.3 degree Celsius. the specific heat of water is 4.18 J/(g °C) is 14397.17 J.
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Sodium and lithium have similar chemical properties. What characteristic of these elements explains why they are chemically similar?.
Sodium metal (Na) has properties with lithium metal (Li) because the two metals are located in the same group, namely group IA.
What are the physical and chemical properties of group IA?All elements in group IA are included in the alkali metals, except hydrogen, because the character possessed by hydrogen is "different" and does not match the character of other alkali metals.
Physically properties, all alkali metals are shiny white (silver), except for cesium which is golden yellow. The texture of this metal tends to be soft. If we try to burn this metal, the resulting flame will be different, namely lithium (red), sodium (yellow), potassium (purple), rubidium (red), and cesium (blue).Chemical properties, alkali metals are the most reactive metal group. That is, the more reactive a metal is, the easier it is to lose electrons. In addition, if we order from top to bottom on the periodic table, the electronegativity, ionization energy, melting point, and boiling point properties will be smaller.Learn more about alkali metals here https://brainly.com/question/19109836
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in an experiment, 4.14 g of phosphorus combined with chlorine to produce 27.8 g of a white solid compound. (a) what is the empirical formula of the compound? (b) assuming that the empirical and molecular formulas of the compound are the same, what is its name?
PCL₅ is the empirical formula of the compound.
Phosphorous pentachloride is it's if empirical formula and molecular formula are assumed to be the same.
Empirical formula is the lowest relative ratios of atoms that are present in a molecule or compound. It shows the simplest ratio and not the actual number of atoms hence should not be confused with molecular formula.
quantity of phosphorus : 4.14g
quantity of white compound after combining with chlorine : 27.8g
therefore quantity of chlorine = 27.8g - 4.14g => 23.66g
Molecular weight of Phosphorus: 30.97g
Molecular weight of Chlorine: 35.45g
For no. of moles= given weight / molecular weight
Moles of phosphorus= 4.14g / 30.97 => 0.1337 moles
Moles of Chlorine= 23.66g / 35.45 => 0.6674 moles
For empirical formula, we divide with the smaller entity i.e. 0.1337
Phosphorus: 0.1337 / 0.1337 => 1
Chlorine: 0.6647 / 0.1337 => 5
hence the empirical formula is PCL₅
Name of the compound : Phosphorus pentachloride
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Can yall help me with this
Answer:
A.
Explanation:
A probe was sent to record the event
Would you expect the equivalence point ph of the wasb to be slightly acidic, neutral, or slightly basic? how does this compare to the sasb equivalence point ph?.
the WASB has a slightly acidic equivalence point and SASB has a slightly basic equivalence point. This is because WASB has a higher concentration of hydronium ions than SASB.
Hydronium ions play an important role in acid-base reactions. It is the hydrogen ion that is released or taken up in the acid-base reaction. The higher the concentration of hydronium ions, the more acidic the solution. In an acid-base reaction, an acid donates a hydrogen ion to a base. Bases accept hydrogen ions. This creates new water molecules. The equivalence point is the point at which an acid and a base react with 1:1 ratio. At this point the solution is neutral. If the acid has a higher concentration of hydronium ions than the base, the equivalence point is slightly acidic. This is due to the presence of more hydronium ions than at the start of the reaction. If the base has a higher concentration of hydronium ions than the acid, the equivalence point is slightly basic.
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this table shows the acceleration due to gravity on four different planets what planet is a person standing on if the person has a mass of 85.0 kg and weighs 305 N mercury is 3.59 Venus 8.87 Earth 9.81 mars 3.77
A.mercury
B.Venus
C.earth
D. Mars
Option C. The character has a mass of 85. zero kg and weighs 305 N mercury is three.59 Venus is eight.87 Earth is 9. eighty-one mars three.77: C.earth
Earth is expected to be 4.54 billion years old, plus or minus about 50 million years. Scientists have scoured the Earth looking for the oldest rocks to radiometrically date. In northwestern Canada, they determined rocks approximately four.03 billion years vintage.
The earliest existence on earth might have been just as purple as its miles green nowadays, a scientist claims. ancient microbes might have used a molecule other than chlorophyll to harness the solar rays, one which gave the organisms a violet hue. The third planet from the sun, Earth is the handiest region in the acknowledged universe shown to host existence. With a radius of 3,959 miles, Earth is the 5th largest planet in our sun machine, and it's the handiest one regarded as positive to have liquid water on its floor. Earth is also unique in phrases of monikers.
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explain why atoms only emit certain wavelengths of light when they are excited. check all that apply.
Answer:
Explanation:
Atoms emit light because excited electrons are returning to lower energy states, emitting the energy difference :- Bohr model. This energy always has a specific wavelength because the electrons can only exist in set orbits.
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#SPJ4at the standard temperature , the pressure inside an lp [propane] gas cylinder is 883 kpa. what is , the absolute pressure inside the gas cylinder when it is full, and when it is completely empty?
984 kpa is the absolute pressure of gas cylinder when full.
101 kpa is the absolute pressure of gas cylinder when it’s empty.
Pressure is the force exerted on a particular surface area and we know that Absolute pressure is equal to the sum of gauge pressure and atmospheric pressure .Barometric pressure is the best example for absolute referenced pressure. Absolute pressure is measured in N/m² or pascal & kpa which is short for kilopascal
P(absolute)=P(gauge)+P(atm)
Here P(gauge) is pressure due to the contents present inside the cylinder
P(atm) is the pressure exerted by the atmosphere
=>883 kpa+101 kpa =984 kpa when full
Note that when the cylinder is empty the gauge pressure is zero as there is no substance to exert pressure So, only atmospheric pressure is exerted.
P(absolute)=0(because the cylinder is empty) + 101 kpa
Therefore P(absolute) =101 kpa when cylinder is empty.
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A chemist runs the following decomposition reaction: C2H6 → 2 C + 3 H2
If she starts with 50.0 g of C2H6, how many grams of carbon will be made?
Fluorine,chlorine and iodine are all part of which family in the periodic table
Explain why you selected the rock you did in Question 1. Which characteristics helped you make a decision?
You take in that you need to make a decision. Try to notice and define the nature of the decision you must make. This first step is very important.
What are the first characteristics of decision-making?Decision-making requires the identification and selection of alternatives on the basis of values, linking, requirements, and beliefs. To begin the procedure objectives must be defined, classified, and ordered in the order of their importance. Decision-making involves the recognition and selection of alternatives on the basis of values, preferences, concerns, and beliefs. Decision-making means selecting a course of action from two or more alternative strategic decision-making (SOM) is of great and growing importance.
So we can conclude that attribute of Decision Making · It is a process of selecting a course of action from among the alternative courses of action.
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Neurons that are rare, small, and lack features that distinguish dendrites from axons are called.
Answer:Anaxonic Neurons
Explanation:
How are biofuel prepared?
Answer:
fermentation of crops that are high in sugar (starch) or fat into ethanol,
Explanation: