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which option is an example of a physical change??
A breaking chemical bonds
B forming chemical bonds
C nuclear decay
D melting a substance
which option is an example of a chemical change
A ironing a shirt
B melting cheese
C grinding powder
D fireworks exploding
Answers
Answer:
D
Explanation:
Melting of ice is a physical change as there no new compound is forming only state is changing So Option D is correct option. For second question Option D is correct option as combustion reaction is taking place.
What is chemical change?Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same
One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature. Physical change is just opposite of chemical change. Phase change is an example of physical change.
Thus option D is correct option in both cases.
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Related Questions
5) To check the accuracy of our results we will compare our results to the label on the vinegar bottle. The bottle contains 4% vinegar. We will need to change our M results to %% in order to calculate a percent error.
Using the average M and the average volume (you have to change it to LITERS) of the acetic acid find the # of moles of acetic acid using the molarity formula from Table T.
Change moles to grams using the gfm of acetic acid (HC,H,O,).
Divide grams of acetic acid by the average volume (this time in ml.) of acetic acid and then multiply by 100. This is your experimental %.
Calculate the % error.
6. What other indicator could we have used?
7. What adjustment to our calculations would we have needed to make if we used barium hydroxide rather than sodium hydroxide? (It might be helpful to write the formula for barium hydroxide
Answers
5) Convert molarity to percent, calculate moles of acetic acid, convert moles to grams, divide grams by volume in mL, multiply by 100 to obtain experimental percent, and calculate percent error.
6) Phenolphthalein could have been used as an alternative indicator.
7) When using barium hydroxide instead of sodium hydroxide, adjust the calculations by considering the stoichiometry of the reaction and using a molar ratio of 2:1 between acetic acid and barium hydroxide.
5. To calculate the percent error in the concentration of acetic acid, we need to convert our molarity (M) results to percent (%). Using the average molarity and the average volume (converted to liters) of acetic acid, we can calculate the number of moles of acetic acid.
Then, by converting moles to grams using the molar mass of acetic acid (CH3COOH), we can divide the grams of acetic acid by the average volume (in milliliters) of acetic acid and multiply by 100 to obtain the experimental percent.
Finally, we can calculate the percent error by comparing the experimental percent to the labeled percent (4% vinegar on the bottle).
6. An alternative indicator that could have been used is phenolphthalein. Phenolphthalein is commonly used in acid-base titrations and changes color in a specific pH range, indicating the endpoint of the reaction.
6. If barium hydroxide (Ba(OH)2) were used instead of sodium hydroxide (NaOH), the adjustment in calculations would involve the stoichiometry of the reaction. The balanced chemical equation for the reaction between acetic acid and barium hydroxide is:
2CH3COOH + Ba(OH)2 → Ba(CH3COO)2 + 2H2O
The molar ratio between acetic acid and barium hydroxide is 2:1. Therefore, the number of moles of barium hydroxide used would be half the number of moles of acetic acid in the calculation.
The rest of the procedure, including converting moles to grams and calculating the percent, would remain the same.
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An -ate or -ite at the end of a compound name usually indicates that the compound contains
Answers
Answer:
Your answer would be "Polyatomic anions."
I ask that you search to ensure there is not a similar question as it would save you time.
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please help asap !! i don’t know if that’s the right answer
Answers
Answer:
b, c and d (last three options)
Explanation:
It can't be the first one because:
On the left hand side there is one of everything and then on the right, ther is one zinc, two chloride and 2 hydrogen atoms. It is unbalanced
Second one:
there are 8 carbons on both sides, 20 hydrogens on both sides and 26 oxygen on both sides. It is balanced
Third
1 copper on both sides, 2 hydrogens on both sides and 1 oxygen on both sides. It is balanced
Fourth
4 silver on both sides and 2 oxygens on both sides
A balloon contains a 10% glucose solution. The balloon is permeable to water but not to glucose. A beaker contains a 5% glucose solution. What will happen when the balloon is submerged in the beaker
Answers
The state of the balloon:
When the balloon is submerged in the beaker, the amount of water in the beaker will get reduced.
What is Osmosis:
Based on the concentration of solutes on both sides of the membrane, water will flow through a permeable membrane in a specific direction.
Hypertonic solution:
It means that there are more solutes present in the surrounding environment than in the cell itself.
Hypotonic solution:
In a hypotonic solution, the concentration of solutes inside the cell is higher than that outside the cell.
When comparing two solutions, the one with the larger solute concentration is hypertonic, and the one with the lower solute concentration is hypotonic. Isotonic solutions have an identical solute concentration.While the solution in the beaker is hypertonic, Meaning that will draw water molecules out of the cell. As water molecules move from a location of high water potential (dilute solution) to a region of reduced water potential (10% glucose solution), the water from the 5% glucose solution will flow into the 10% one (concentrated solution)This is the reason why the amount of water decreases when the balloon is submerged in the beaker.Learn more about the glucose solution and permeability here,
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When electrons flow steadily in one direction, the current is:
Static
Alternating
Direct
Answers
1. Calculate the energy for each of the following (1 pt each): Show all your work(a) Joules needed to heat 83.5 g of water from 26.7 °C to 75 °C.
Answers
The question requires us to calculate the energy, in joules (J), necessary to heat 83.5g of water from 26.7 °C to 75°C.
The heat energy (Q) can be calculated from the mass of the sample (m), its specific heat capacity of the substance (C) and temperature variation (ΔT), as given by the following equation:
\(Q=m\times C\times\Delta T\)Since the question did not provide a value for the specific heat capacity of water, we'll adopt the value 4.182 J/g.°C. Applying the values provided by the question, we can calculate the heat energy as:
\(\begin{gathered} Q=m\times C\times\Delta T \\ Q=(83.5g)\times(4.182J/g\mathrm{}\degree C)\times(75-26.7)\degree C=(83.5g)\times(4.182J/g\degree C)\times(48.3\degree C) \\ Q=1.69\times10^4J \end{gathered}\)Therefore, the heat energy necessary to heat the amount of water given grom 26.7 to 75°C is 1.69 x 10^4 J (or 16900 J).
What is the wavelength of electromagnetic radiation
with a frequency of 5.00 × 1 0 12 Hz? What kind of
electromagnetic radiation is this?
Answers
Answer:
λ = 6x10^-5 m
Explanation:
c = λf
3.00x10^8 = 5.00x10^12 x λ
λ = 6x10^-5 m
18 which solution has a molality of 0.25 m Naci?
0.5 mol Naci in 4.0 kg water
0.25 mol NaCl in 10 kg water
0.25 g Nai in 1.0 kg water
1.0 kg NAC in 40 kg water
Answers
What is a moon phase that looks like less than a half circle from earth?
Answers
Answer:
last quarter moon/half moon
Explanation:
what will be the result of the reaction
(CH3COO)2+redP +Cl2
Answers
Answer:
(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl
Explanation:
This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.
How many electrons will oxygen gain when it becomes an ion?
A. It will lose electrons.
B. 2
C. 1
D. 3
Answers
Answer:
two electrons
Explanation:
Since every electron has a single negative charge, the addition of two electrons results in an oxygen ion with a charge of - 2
Identify each of the following compounds as a nonelectrolyte, a weak electrolyte, or a strong electrolyte: (a) lactose (C12H22O11), (b) lactic acid (HC3H5O3), (c) dimethylamine [(CH3)2NH], (d) barium hydroxide Ba(OH)2.
Answers
The classification of the given compounds is as follows:
(a) lactose (C₁₂H₂₂O₁₁) - non-electrolytes
(b) lactic acid (HC₃H₅O₃) - weak electrolytes
(c) dimethylamine [(CH₃)₂NH] - weak electrolyte
(d) barium hydroxide Ba(OH)₂ - strong electrolytes
What are electrolytes?Electrolytes are substances that when in the molten or solution state conduct electricity and are decomposed by the direct current passing through them.
Electrolytes dissociate into the component ions when they are dissolved in water or in molten form. Some examples of electrolytes are acids and bases.
Strong electrolytes dissociate completely into one while weak electrolytes dissociate partially.
Non-electrolytes do not dissociate into ions in solution but remain as molecules. Some example of non-electrolytes is organic solvents.
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explain what keeps the electrons confined in the space surrounding the nucleus
Answers
Answer:
Electrons are trapped inside the atom because of the attraction forces with positively charged protons that are found in the nucleus.
If you burn 27.827.8 g of hydrogen and produce 249249 g of water, how much oxygen reacted?
Answers
Approximately 222.4 grams of oxygen reacted in the combustion process. To determine the amount of oxygen that reacted, we can use the balanced chemical equation for the combustion of hydrogen:
2H₂ + O₂ → 2H₂O
From the equation, we can see that 1 mole of oxygen reacts with 2 moles of hydrogen to produce 2 moles of water.
First, we need to convert the given masses of hydrogen and water into moles using their molar masses:
Molar mass of hydrogen (H₂) = 2 g/mol
Molar mass of water (H₂O) = 18 g/mol
Mass of hydrogen in moles = 27.8 g / 2 g/mol = 13.9 mol
Mass of water in moles = 249 g / 18 g/mol = 13.8 mol
Since the stoichiometry of the reaction tells us that 2 moles of hydrogen react with 1 mole of oxygen, we can calculate the moles of oxygen consumed as:
Moles of oxygen consumed = 13.9 mol / 2 = 6.95 mol
Finally, we can convert the moles of oxygen to grams using its molar mass:
Molar mass of oxygen (O₂) = 32 g/mol
Mass of oxygen consumed = 6.95 mol × 32 g/mol = 222.4 g
Therefore, approximately 222.4 grams of oxygen reacted in the combustion process.
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the half life for the first order decomposition of h202 is 660 minutes. what is the rate constant for the reaction
Answers
The rate constant for the first-order decomposition of H2O2 with a half-life of 660 minutes is approximately \(0.00105 min^(-1).\)
To find the rate constant for the first-order decomposition of H2O2 with a half-life of 660 minutes, you can use the following formula:
rate constant (k) = ln(2) / half-life
Step 1: Plug in the given half-life value.
k = ln(2) / 660 minutes
Step 2: Calculate the rate constant.
\(k ≈ 0.00105 min^(-1)\)
So, the rate constant for the first-order decomposition of H2O2 with a half-life of 660 minutes is approximately 0.00105 min^(-1).
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How many moles are there in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid?
Answers
Answer:
0.25moles
Explanation:
There are 1000\(cm^{3}\) for 1\(dm^{3}\)
Therefore in 1000\(cm^{3}\) of 0.5 mol/\(dm^{3}\) solution has = 0.5 moles
Therefore 500\(cm^{3}\) contains = 0.5/1000 x 500 = 0.25moles
The number of moles of sulfuric acid in 0.5 mol/dm³ solution is equal to 0.25 mol.
What is the molarity?The concentration of the solution can be determined as the number of moles of a solute in per unit volume of a solution is known as molarity or molar concentration.
The Molarity of the solution is calculated in the following formula:
Molarity (M) = Moles (n)/Volume of the Solution (in L)
Now if we have to find the number of moles of solute in the solution, the formula becomes:
Number of moles of solute (n) = Molarity (M) × Volume of the Solution
Given, the concentration of the sulfuric acid solution = 0.5 mol/dm³
The volume of the solution, V = 500 cm³
As we know, 1 dm³ = 10³ cm³, the volume of solution = 0.5 dm³
The number of moles of the sulfuric acid = M × V
= 0.5 × 0.5 = 0.25 mol
Therefore, 0.25 moles of sulfuric acid in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid.
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There are only purple marbles and orange marbles in a bag.
There are three more purple marbles than orange marbles in the bag.
There are more than 12 marbles in the bag.
Roxanne is going to take at random two marbles from the bag.
43
The probability that Roxanne will take two marbles of the same colour is
88
Work out the number of orange marbles in the bag
Answers
There are 5 orange marbles in the bag.
Let's assume the number of orange marbles in the bag as x. According to the given information, there are three more purple marbles than orange marbles. Therefore, the number of purple marbles in the bag would be x + 3.
The total number of marbles in the bag would be the sum of orange and purple marbles, which is x + (x + 3) = 2x + 3.
Given that there are more than 12 marbles in the bag, we have 2x + 3 > 12.
Solving this inequality, we find 2x > 9, which implies x > 4.5. Since the number of marbles cannot be a fraction, the minimum number of orange marbles is 5.
Therefore, there are 5 orange marbles in the bag.
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Will give brainliest please help!!
Answers
Answer:
D. The energy level of the electron.
Explanation:
There are four quantum numbers which are used to describe the movement and paths or positon of each electron within an atom. Quantum numbers can be used to determine the electronic configuration of atoms and the most likely location of the atom's electrons. Quantum numbers are also used in determining other characteristics of atoms, such as ionization energy and the atomic radius.
The four quantum numbers are namely, principal, azimuthal, magnetic and spin quantum numbers.
Principal quantum numbers are denoted by the symbol ‘n’. They describe the principal electron shell or energy level the atom.The value of the principal quantum number are positive integer values that is equal to or greater than one. The value n = 1 represents the innermost electron shell of an atom, which corresponds to the lowest energy state of an electron. The larger the values of 'n' the greater the energy level and the farther the electron is from the nucleus.
How does temperature, pressure, and density impact the core of the Earth?
Answers
Answer:
temperatures within the outer core range from 7,200 to 9,000 F. Pressure also increases in the outer core due in part to the weight of the crust and mantle above.The Earth's magnetic field is generated by the outer core.
Explanation:
when placed at the same temperature, compare the entropy of 10 mole of ar(g) at 10.0 atm and 10 mole of ar(g) at 0.5 atm. which system has a higher entropy? group of answer choices 10 mole of ar(g) at 10.0 atm 10 mole of ar(g) at 0.5 atm there is not enough information. they are the same in entropy.
Answers
When placed at the same temperature, the entropy of 10 mole of Ar(g) at 10.0 atm and the 10 mole of Ar(g) at 0.5 atm. The system has a higher entropy is 10 mole of Ar(g) at 0.5 atm.
The entropy is the measure the randomness of the of the system. the measure of the system's thermal energy per unit the temperature that is not available for doing the useful work.
The Entropy will increases with temperature at the constant pressure. The pressure increases leads to the higher degree of the order in the molecular arrangement. so, the entropy decreases with the increasing pressure.
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Select all the options that correctly describe ionization energy (IE) and/or its role in chemical reactivity.A. Ionization energy is commonly expressed as the energy required to remove an electron from each atom in exactly 1 mole of atomsB. Ionization energy is related to electron configuration and helps to explain differences in the reactivities of metals.
Answers
.A. Ionization energy is commonly expressed as the energy required to remove an electron from each atom in exactly 1 mole of atoms all the options that correctly describe ionization energy (IE) and/or its role in chemical reactivity
Why does removing an electron from an atom take energy?More energy must be released for each additional electron. Because the atom's overall charge changes to positive after the first electron is gone, the negative forces of the remaining electrons will be drawn to the positive charge of the newly created ion.
The amount of energy needed to expel the highest-energy electron from a neutral atom is known as the ionisation energy (IE). Ionisation energy often rises over a time and falls over a group. Effective nuclear charge rises with time while electron shielding stays constant.
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Identify three colligative properties of solutions. Then, describe why the colligative properties of solutions differ from those properties of pure substances.
Answer in complete sentences
Answers
Answer:
Three colligative properties of solutions are boiling point elevation, freezing point depression, and vapor pressure lowering. These properties depend only on the number of dissolved particles in the solution, not their identity. The colligative properties of solutions differ from those of pure substances because the properties of pure substances depend on the identity of the substance, while colligative properties depend only on the concentration of the solute particles. For example, the boiling point of a solution is always higher than that of the pure solvent because the presence of solute particles lowers the vapor pressure of the solution, making it more difficult for the solvent to vaporize. Similarly, the freezing point of a solution is always lower than that of the pure solvent because the presence of solute particles disrupts the crystal lattice structure of the solvent, making it more difficult for the solvent to freeze.
Most of earths fresh water is in glaciers
True or false
PEASE HELPP
Answers
Answer:
True
Explanation:
Explanation:
Most of oceans are salt water.
BUT lakes, ponds, springs, glaciers, etc are fresh water
the element to atomic 35 belong to_____ A, s-block B,P-block c, d-block D,f-block
Answers
Answer:
B
Explanation:
p block bc its last orbit is 4p5
Answer:
Explanation:
P. block
Red gold i a gold-copper alloy ued to make jewelry. A piece of jewelry made of red gold weigh 9. 21 g and ha a volume of 0. 559 cm'. Gold ha a denity of 19. 3 g/em' and copper ha a denity of 8. 96 g/cm?. Calculate the percentage by ma of each metal in the jewelry. Aume the total volume of the jewelry i the um of the volume of the two metal it contain
Answers
Red gold is a gold-copper alloy that is commonly used to make jewelry. To calculate the percentage by mass of each metal in the jewelry, you need to determine the mass of gold and copper in the jewelry. The mass of gold can be calculated using the density of gold and the volume of gold in the jewelry:
mass of gold = density of gold * volume of gold
mass of gold = 19.3 g/cm³ * 0.559 cm³
mass of gold = 10.8 g
The mass of copper can be calculated using the density of copper and the volume of copper in the jewelry:
mass of copper = density of copper * volume of copper
mass of copper = 8.96 g/cm³ * (0.559 cm³ - 0.559 cm³)
mass of copper = 0 g
The total mass of the jewelry is 10.8 g + 0 g = 10.8 g.
Therefore, the percentage by mass of gold in the jewelry is 10.8 g/10.8 g = 100%. The percentage by mass of copper in the jewelry is 0 g/10.8 g = 0%.
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plsss help will give BRAINLIEST
Answers
2.Na2O4S
3.BrLi
4.KF
5.MgN2O6
6.Sr3N2
7.CaCO3
All numbers should be subscripts
in this experiment, you will use universal indicator to qualitatively measure ph. the universal indicator in this experiment is a mixture of 4 common indicators allowing for a large ph range to be measured. the following table (also available in your lab manual) describes the individual components of our universal indicator. universal indicator components indicator low ph color transition ph range high ph color thymol blue (1st transition) red 1.2 - 2.8 yellow methyl red red 4.4 - 6.2 yellow bromothymol blue yellow 6.0 - 7.6 blue thymol blue (2nd transition) yellow 8.0 - 9.6 blue phenolphthalein colorless 8.3 - 10.0 fuchsia select all of the following statements that are true about the universal indicator. group of answer choices at ph 1.2, the indicator will appear red. the universal indicator is a single chemical compound. the universal indicator (or parts thereof) are in equilibrium and have an associated k value. at a ph 7, the indicator will appear colorless.
Answers
At PH 1.2, the indicator will appear red.
Universal indicator- The universal indicator is a mixture of 4 common indicators allowing for a large pH range to be measured.
At pH 7, the indicator will appear yellow due to bromothymol blue. The universal indicator (or parts thereof) are in equilibrium and have an associated K value.
K value- The K value indicates the amount of products and reactants present in the reaction. It is an equilibrium ratio of the concentration of products and the reactants.
A universal indicator is made by mixing bromomethyl, methyl orange and phenolpthalein in alcohol.
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Numbers that preceded symbols and formulas in a chemical equation are
catalysts
coefficients
superscripts
subscripts
Answers
A tank initially contains 100gal of pure water. Brine containing 2lb of salt per gallon enters the tank at 4gal/min, and the (perfectly mixed) solution leaves the tank at 6gal/min. Let A(t) be the amount of salt at time t. Find the solution for this model. How much salt and solutions in the tank at the moment of t=20 minutes?
Answers
At t = 20 minutes, there is approximately 180.48lb of salt and 60gal of solution in the tank.
Let's denote A(t) as the amount of salt at time t.
The rate of change of salt in the tank is given by the rate at which brine enters the tank minus the rate at which the solution leaves the tank. In this case, the rate at which brine enters the tank is 4gal/min and contains 2lb of salt per gallon. So, the rate of salt entering the tank is (4gal/min) * (2lb/gal) = 8lb/min.
The rate at which the solution leaves the tank is 6gal/min. Since the tank initially contains 100gal of pure water, the amount of solution leaving the tank without salt is (6gal/min) * (100gal) = 600gal.
Therefore, the differential equation for the amount of salt A(t) is dA/dt = 8 - (6/100)A.
To solve this differential equation, we can use separation of variables and integrate. The solution for A(t) is A(t) = 400(1 - e^(-t/50)).
At t = 20 minutes, we can substitute t into the solution to find the amount of salt in the tank. A(20) = 400(1 - e^(-20/50)) ≈ 400(1 - 0.5488) ≈ 400(0.4512) ≈ 180.48lb.
The amount of solution in the tank at t = 20 minutes is 100gal + (4gal/min - 6gal/min)*20min = 100gal - 40gal = 60gal.
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There are 40 lb of salt in the tank at t = 20 minutes. Since the tank initially contains 100gal of pure water.
We can use the concept of differential equations. We know that the rate at which salt enters the tank is 2lb/gal * 4gal/min = 8lb/min. Similarly, the rate at which salt leaves the tank is 6gal/min.
The amount of salt and solution in the tank at t = 20 minutes, we substitute t = 20 into the equation:
A(20) = 2(20) = 40 lb.
Therefore, there are 40 lb of salt in the tank at t = 20 minutes. Since the tank initially contains 100gal of pure water.
Salt is a mineral composed primarily of sodium chloride (NaCl).
Salt is essential for life in general, and saltiness is one of the basic human tastes.
Salt is one of the oldest and most ubiquitous food seasonings, and is known to uniformly improve the taste perception of food, including otherwise unpalatable food.
Salting, brining, and pickling are also ancient and important methods of food preservation.
Salt is mostly sodium chloride (NaCl). Sea salt and mined salt may contain trace elements. Mined salt is often refined. Salt crystals are translucent and cubic in shape; they normally appear white but impurities may give them a blue or purple tinge.
When dissolved in water sodium chloride separates into Na+ and Cl− ions, and the solubility is 359 grams per litre.
From cold solutions, salt crystallises as the dihydrate NaCl·2H2O.
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Identify the lewis acid in this balanced equation: upper a g superscript plus, plus 2 upper n upper h subscript 3 right arrow upper a g (upper n upper h subscript 3) subscript 2 superscript plus. ag nh3 ag(nh3)2
Answers
The equation that has been the representation of the net ionic equation has been Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O.
What is the balanced equation?
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
The balanced chemical equation for the reaction has been:
\(\rm Mg(OH)_2+2HNO_3-- > Mg(NO_3)_2+H_2O\)
The net ionic equation has been given as the ionic form of the reactants and product that has been formed in the reaction. The ions same on the product and reactant side of the equation has been eliminated in the net ionic equation.
The net ionic equation for the given chemical reaction has been:
\(\rm Mg^{2+}+OH^++2H^++2NO^{-}_3-- > Mg^{2+}+NO^{-}_3+2H_2O\\\\OH^{-}+2H^+-- > 2H_2O\)
The equation that has been the representation of the net ionic equation has been Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O. Thus, option A is correct.
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Answer:
A on edge
Explanation:
Just trust