Is breaking an egg an example of a physical or chemical change? explain your answer.
b.is cooking an egg an example of a physical or chemical change? explain your answer?
Breaking an egg is an example of a physical change. This is because the egg was broken, thus its physical appearance was different. If you were to cook the egg, that would be a chemical change because that would result in a new chemical formation of the stuff inside of the egg. But since you're only breaking the egg, it's just a physical change.
I guess that answers both questions.
Hope that helped!
Answer:
Because the egg is broken in Physical Change.
Explanation:
Boiled Egg is inside the cooking rice in Chemical Change.
Phenol red is a common ph indicator. you add phenol red to an unknown substance and it turns yellow. what does this indicate about the ph of the substance?
The pH of the substance is less than 6.8.
Phenol red is a pH indicator that changes color depending on the acidity or basicity of the solution it is added to. When phenol red is added to a solution, it exhibits a range of colors: it is yellow in acidic solutions (pH less than 6.8), red or pink in neutral solutions (pH around 6.8 to 8.2), and purple or red-violet in basic solutions (pH greater than 8.2). Since the phenol red turned yellow upon addition to the unknown substance, this indicates that the pH of the substance is less than 6.8, meaning it is acidic.
Identify the limiting reagent in the reaction mixture shown below (red = a2, blue = b2). the balanced reaction is a2+2b2→2ab2
Final answer:
The limiting reagent is the reactant that is completely consumed and determines the amount of product formed in a chemical reaction.
Explanation:
The limiting reagent in a chemical reaction is the reactant that is completely consumed and determines the amount of product that can be formed. In the given equation a2+2b2→2ab2, we need to determine the limiting reagent. To do this, we compare the number of moles of each reactant to the coefficients in the balanced equation. The reactant that has fewer moles than required by the stoichiometry is the limiting reagent.
For example, if we have 2 moles of a2 and 3 moles of b2, we can see that a2 is in excess because it has more moles than required (2 moles versus 1 mole in the balanced equation). Therefore, b2 is the limiting reagent.
In the Periodic Table, atoms in the same _______ have the same number of valence electrons, and tend to have similar chemical behavior. A. column B. diagonal C. row D. All of the Above E. None of the Above
Why didn't mendeleev use atomic number to arrange the elements?
The primary reason for this was that Mendeleev
didn't know that atomic numbers actually existed. Atomic numbers
were only discovered a period after Mendeleev's time. The use of X-rays made it
possible to find the atomic number, and those had not been discovered yet.
The periodic table was then arranged in 1913 by Henry Moseley
in an arrangement according to atomic number.
How to write a balanced chemical equation from empirical formula?
To write a balanced chemical equation from an empirical formula, identify the reactant and products, write an unbalanced equation, balance the elements one by one, and make sure to use whole numbers. It's important to note that the final equation must reflect the law of conservation of matter.
Explanation:To write a balanced chemical equation from an empirical formula, you need to follow a few steps:
Identify the empirical formula. Say, we have C₂H₆.Identify the reactant and products. In this case, we have O₂ as the reactant and H₂O and CO₂ as products.Set up an unbalanced equation: C₂H₆ + O₂ → H2O + CO2.Balance the elements one by one. Start with carbon (C): C₂H₆ + O₂ → 2CO2 + H2O; then balance the hydrogen (H): C₂H₆ + O₂ → 2CO2 + 3H2O.Finally, balance the oxygen (O) on both sides. This could result in a fraction (since there could be an odd number of oxygen atoms), but that's acceptable for intermediate steps: C₂H₆ + 7/2O₂ → 2CO2 + 3H2O.However, we generally prefer to use whole numbers, so if you do have fractions, multiply everything by 2: 2C₂H₆ + 7O₂ → 4CO2 + 6H2O.This process ensures that the final balanced equation reflects the law of conservation of matter, where the numbers of each type of atom are equal on both sides of the equation.
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In an unconformity between two layers of rock, how is the upper layer usually described?
much younger than the lower layer
the same age as the lower layer
a little older than the lower layer
much older than the lower layer
correct answer is much younger than the lower layer
/the first one is the right one :)
hope i helped
The upper layer is usually described as much younger than the lower layer. Therefore, option (A) is correct.
What is an unconformity?An unconformity can be described as a break in the geologic rock and fossil record. Rock layers are deposited continuously over geologic time and give information about the past events that have happened on earth.
Certain events can cause rocks to be eroded and results in an interruption in the geologic record. The surface between two rock layers of different ages is a break in an unconformity and the geologic record.
There are three kinds of geologic unconformities which are nonconformities, disconformities, and angular unconformities. Nonconformity can be described as a surface between two layers of sedimentary rock, where the upper layer is much younger than the lower layer.
All the layers that are above and below the unconformable surface are known as sedimentary rocks. A disconformity can be described as a surface that divides young sedimentary rocks from much older, underlying metamorphic rocks.
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CHEMISTRY HELP !!!!
1. If you were to grind up a pepperoni pizza and test it for each of the macromolecules, what color would each test tube turn? For each macromolecule listed, (give the color that the solution would change if it is present.)
Pizza Test Tube / Color of solution
Starch
Protein
Lipid
When testing a pepperoni pizza for macromolecules, an iodine solution will turn blue-black for starch, a Biuret reagent will turn purple for protein, and fats will create transparent oil stains on paper. The Benedict's solution will change color from green to reddish-orange if reducing sugars like glucose are present.
If you were to grind up a pepperoni pizza and test it for each of the macromolecules, you would expect different colors in test tubes indicating the presence of those macromolecules. Specifically, the colors will change based on the reactions of the food components with certain chemicals.
Starch: If there is starch in the pizza, you would use an iodine solution for testing. The presence of starch would turn the iodine solution from its original orange-brown color to a blue-black color.Protein: The Biuret reagent is commonly used to test for proteins. If proteins are present, the solution would change to a purple hue.Lipids: The test for lipids, such as fats and oils, is known as the fat emulsion test. After crushing a piece of the pizza with ethanol and allowing it to evaporate, the appearance of transparent oil stains on paper would indicate the presence of lipids.In the context of the specific examples provided, when Benedict's solution is added and the mixture is heated, a positive result for the presence of reducing sugars like glucose would change the solution to a range of colors from green to reddish-orange, depending on the quantity of the reducing sugar.
How many valence electrons does holmium have?
How many atoms are present in 0.35 mol of carbon dioxide?
Answer : The number of atoms present are, [tex]6.3\times 10^{23}[/tex]
Explanation : Given,
Moles of [tex]CO_2[/tex] = 0.35 mole
As we know that, 1 mole of substance contains [tex]6.022\times 10^{23}[/tex] number of atoms.
In [tex]CO_2[/tex], there 1 atom of carbon and 2 atoms of oxygen. So, the total number of atoms in [tex]CO_2[/tex] are, 3.
As, 1 mole of [tex]CO_2[/tex] contains [tex]3\times 6.022\times 10^{23}[/tex] number of atoms.
So, 0.35 mole of [tex]CO_2[/tex] contains [tex]0.35\times 3\times 6.022\times 10^{23}=6.3\times 10^{23}[/tex] number of atoms.
Therefore, the number of atoms present are, [tex]6.3\times 10^{23}[/tex]
What is the mass of 1.50 mol of sodium, na?
To get the answer, you must know first the formula:
We know that moles = mass divided by molecular weight
So to get the mass, we need to alter the original formula, so
mass of sodium = 1.5 moles x atomic weight of Na
so what is the atomic weight of Sodium? It is 22.989769 u.
so the mass of sodium = 1.5 moles x 22.989769 u = 34.4846535
Which gas sample STP has the same total number of molecules at 2.0 L of CO2(g) at STP
5.0L
2.0L
6.0L
The melting point of h2o is 0 degrees celsius. this is the same as its:
Final answer:
The melting point of H₂O at 0°C is the same as its freezing point, allowing solid and liquid water to coexist at this temperature due to the unique properties of how water molecules arrange themselves.
Explanation:
The melting point of H₂O, or water, is 0 degrees Celsius (0°C), which is crucially the temperature where both the solid and liquid forms of water can coexist in equilibrium. This means that at 0°C, water can either freeze or melt without a change in temperature.
Understanding this concept is important because it highlights the uniqueness of water and many of its properties, including its density. Ice, being the solid form of H₂O, is actually less dense than liquid water due to the way hydrogen bonds expand the molecular structure when freezing.
This property of water is essential for the environment and plays a pivotal role in the Earth's climate and helps sustain life.
A student dissolves some solid sodium hydroxide in a beaker of water. Which are the solute and the solvent?
Choose all answers that are correct.
A. solvent: sodium hydroxide
B. solute: water
C. solvent: water
D. solute: sodium hydroxide
Answer:
sodium hydroxide is solute and water is solvent
Explanation:
Solutes are minor component of a solution which remain dissolved into solvent.Solvents are major component of a solution which remain present in excess amount in solution.As small amount of solid sodium hydroxide is added into a large excess of water in beaker therefore sodium hydroxide is solute and water is solvent.Option (C) and option (D) are correct.what crystals are formed when a molten ceramic cools slowly
Bigger crystals of rock are formed when a molten ceramic cools slowly.
What is the igneous process?Igneous rock can be described as one of the three rock types, sedimentary and metamorphic. Igneous rock can be formed through the cooling and solidification of magma or ceramic.
The magma derives from partial melts of rocks in either a mantle or crust. The melting is caused by three processes: an increase in temperature, a decrease in pressure, or a variation in composition.
Solidification occurs either below the surface and can form with crystallization to form granular, crystalline rocks to form natural glasses.
The rate of cooling the ceramic determines the size of the crystals of the rock. If the ceramic cools down slowly then it takes a longer period of time, therefore, the grain size will be bigger. If the ceramic cools rapidly then it takes a shorter period of time, therefore, the grain size will be smaller.
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How many moles of ca atoms are in 534.0 g ca?
The only large land mass(es) not part of a sovereign state is/are
In a nuclear reaction, mass must be lost to produce energy. Please select the best answer from the choices provided T F
A microspectrophotometer measures which of the following?
Electrons
Electricity
Light absorption
Pigments
Answer : The correct option is, Light absorption
Explanation :
Microspectrophotometer : It is a type of instrument that measures the spectra of the microscopic sample by using the different wavelengths of an electromagnetic radiation.
It is designed to measure the the spectrum of the microscopic sample. It is also measure the transmittance, absorbance, polarization and fluorescence of the microscopic sample.
From the given options, the option light absorption is the correct option.
Hence, a microspectrophotometer measures the light absorption.
Answer:
Light absorption
Explanation:
A 0.3870-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.7191Â g of co2 and 0.1472Â g of h2o. what is the empirical formula of the compound?
Final answer:
The empirical formula of the compound containing 40.0% C, 6.71% H, and 53.28% O is C₁H₂O₂.
Explanation:
The empirical formula can be determined by calculating the molar amounts of carbon and hydrogen in the sample based on the masses of carbon dioxide and water produced. In this case, the sample contains 40.0% carbon, 6.71% hydrogen, and 53.28% oxygen. Assuming a 100 g sample, we would have 40.0 g of carbon, 6.71 g of hydrogen, and 53.28 g of oxygen. Converting these masses to moles using the molar masses of the elements (carbon: 12.01 g/mol, hydrogen: 1.008 g/mol, oxygen: 16.00 g/mol), we find that we have 3.3333 moles of carbon, 6.6683 moles of hydrogen, and 3.33 moles of oxygen. Dividing these values by the smallest mole value gives a ratio of 1:2. Therefore, the empirical formula of the compound is C₁H₂O₂.
Macon is 50 miles from Atlanta. If the time of the trip increases, what happens to the speed? Question 8 options: A:It stays the same because the distance stays the same B: It decreases C: It averages out to the same speed. D: It increase
Given information:
Distance (d) = 50 miles
To determine:
The effect on speed as time increases
Explanation:
Speed can be defined as the ratio of the distance (d) traveled to the time (t) taken to cover that distance
Speed = distance/time -----(1)
In the given example since the distance is fixed an increase in the time of the trip will increase the denominator in equation(1) thereby decreasing the speed.
Ans (B) It decreases
At stp, 1.0 l br2 reacts completely with 3.0 l f2, producing 2.0 l of a product. what is the formula of the product? (all substances are gases.)
Answer:
BrF3
Explanation:
Find moles of Br2 and F2 with Pv=nrt formula , then, divide by smallest to find empirical formula
When zinc (or aluminum) was allowed to react with the copper sulfate what was the limiting reagent?
Read the measurement. how many milliliters are shown? 34 ml 38 ml 39 ml 40 ml
Answer:
B
Explanation:
_______ is the spontaneous nuclear change of isotopes with unstable nuclei.
How many electrons will a calcium (ca) atom gain or lose in forming an ion?
When reacting with a chlorine atom, a sodium atom reacts by losing an electron to form the na+ ion, which is _________________________________________?
During which intervals is potential energy decreasing and average kinetic energy remaining constant?
Is it possible to have carbon atoms with different numbers of protons?
How does the reaction of hydrogen and oxygen to produce energy in a fuel cell differ from their interaction during the direct combustion of hydrogen and oxygen?
In a fuel cell, hydrogen and oxygen produce electrical energy through an electrochemical reaction, with high efficiency and low pollution. Direct combustion of hydrogen and oxygen, on the other hand, yields thermal energy with significant energy loss due to thermodynamic limitations.
Explanation:The reaction of hydrogen and oxygen to produce energy in a fuel cell differs substantially from their interaction during the direct combustion of hydrogen and oxygen. In a fuel cell, hydrogen is oxidized at the anode, and oxygen is reduced at the cathode, which results in water as a byproduct and the production of electrical energy directly via an electrochemical reaction. This process is efficient, producing electricity with up to 50%-75% energy efficiency.
In contrast, the direct combustion of hydrogen and oxygen is a much less efficient process, as it generates energy in the form of heat through a combustion reaction. The energy released in direct combustion, when used to power a heat engine, succumbs to second-law thermodynamics constraints, resulting in at least half of the energy being "wasted" to the surroundings with only about 20%-25% energy efficiency.
Moreover, fuel cells are nonpolluting, significantly reduce greenhouse gas emissions, and contribute to less dependence on fossil fuels. However, challenges like economic viability and dependence on natural gas for hydrogen production still hinder the wide adoption of fuel cell technology for applications like fuel-cell vehicles (FCVs).