Final answer:
Dicing potatoes is a physical change since it alters their shape and size but not their chemical identity. This kind of physical change, while being irreversible, does not transform the potatoes into a new substance.
Explanation:
Dicing potatoes is indeed a physical change. This is because when you dice potatoes, you are only changing their shape and size, not their chemical structure or identity. Physical changes can be reversible or irreversible, but they do not alter the fundamental identify of a substance.
Some examples of reversible physical changes include melting, where ice changes to liquid water and can be refrozen, and dissolving, such as when salt is dissolved in water and can be recovered by evaporating the water. Conversely, irreversible physical changes do not easily revert to the original form, such as cutting hair—once it is cut, it cannot grow back instantly.
In the case of dicing potatoes, the physical change is irreversible as you cannot restore the potatoes to their original, uncut state. However, the potatoes remain chemically identical before and after dicing.
How many magnesium atoms are contained in 3.75 moles of magnesium?
What is the difference between carbon 12 and carbon 14 in terms of abundance, stability, and structure?
Brianna wanted to compare the densities of two different solids of the same size 6cm3 (same volume) to see which one was more dense. Solid A had a mass of 2 grams and Solid B had a mass of 0.5 grams. (Density = Mass/volume)
this has to be done in CER form
Answer:
Density of Solid A is greater than B
Explanation:
Given:
Mass of Solid A = 2 g
Mass of solid B = 0.5 g
Volume of both solids = 6 cm3
To determine:
Densities of A and B
Calculation:
Density of a substance is the mass occupied by it in unit volume
[tex]Density = \frac{Mass}{Volume}[/tex]
For Solid A:
[tex]Density = \frac{2\ g}{6\ cm3} =0.33\ g/cm3[/tex]
For Solid B :
[tex]Density = \frac{0.5\ g}{6\ cm3} =0.083\ g/cm3[/tex]
Therefore solid A is more dense than solid B
All atoms of an element always have the same number of question 4 options: electrons protons electrons neutrons save
Write the complete balanced equation for the reaction that occurs when calcium carbonate (CaCO3) reacts with lithium nitride (Li3N) in an aqueous solution.
Answer: [tex]3CaCO_3(aq)+2Li_3N(aq)\rightarrow Ca_3N_2+3Li_2CO_3[/tex]
Explanation: According to the law of conservation of mass, mass can neither be created nor be destroyed.
The mass of products must be same as that of the mass of reactants. For this the number of atoms of each element must be same on both sides of the arrow. Thus we need to balance the chemical equations.
[tex]3CaCO_3(aq)+2Li_3N(aq)\rightarrow Ca_3N_2+3Li_2CO_3[/tex]
A bond created from the sharing of electrons between two atoms is a(an) ______ bond.
Scientific notation is used to express large numbers in convenient form true or false
What term describes a substance that is made when two or more different atoms bond together in a certain ratio?
Answer:
compond
Explanation:
A solution of 34% nacl is separated by a semipermeable membrane to a solution of 22% glucose. the membrane is only permeable to water. which direction will the net osmosis occur?
What two substances are indicated by the cobalt chloride and limewater tests?
How much energy is required to heat 32.5 g of water from 34°C to 75°C
NH3 is nitrogen trihydride (ammonia) and BF3 is boron trifluoride. What is the name for AlCl3 and why?
Explanation:
In [tex]AlCl_{3}[/tex] compound, three chlorine atoms are attached to an aluminium atom.
Since atomic number of aluminium is 13 and it has three extra electrons. So, it donate single electron to each chlorine atom.
Therefore, octet of chlorine gets complete.
As, three chlorine atoms are attached to aluminium so, name of [tex]AlCl_{3}[/tex] is aluminium trichloride.
When magnesium (mg) metal is placed in hydrochloric acid (hcl), it forms magnesium chloride (mgcl2) and a gas. what gas is formed in this reaction?
Water is a polar molecule. this means that __________.
Water is a polar molecule because it has a dipole moment with one end having a slight positive charge and the other a negative charge due to uneven distribution of electron density. This polarity leads to water's unique properties including its solvent capabilities, high boiling point, and its ability to form hydrogen bonds.
Explanation:When we say that water is a polar molecule, it means that it has a dipole moment where one end of the molecule has a slight positive charge and the other end has a slight negative charge. This is due to the uneven distribution of electron density as oxygen is more electronegative than hydrogen, causing the hydrogen atoms to carry a slight positive charge and the oxygen atom to carry a slight negative charge. This polarity results in water's unique properties such as its ability to dissolve many substances (its solvent capabilities), its high boiling point, and its ability to form hydrogen bonds with other water molecules.
#SPJ12
Consider the reaction of magnesium metal with hydrochloric acid to produce magnesium chloride and hydrogen gas. if 3.38 mol of magnesium and 3.38 mol of hydrochloric acid are reacted, how many grams of magnesium chloride are produced?
Answer: The mass of magnesium chloride produced in the given reaction is 16.09 grams.
Explanation:
We are given:
Moles of magnesium = 3.38 mol
Moles of hydrochloric acid = 3.38 mol
The chemical equation for the reaction of magnesium and hydrochloric acid follows:
[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]
By Stoichiometry of the reaction:
2 moles of hydrochloric acid reacts with 1 mole of magnesium.
So, 3.38 moles of hydrochloric acid will react with = [tex]\frac{1}{2}\times 3.38=1.69mol[/tex] of magnesium.
As, given amount of magnesium is more than the required amount. So, it is considered as an excess reagent.
Thus, hydrochloric acid is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
2 moles of hydrochloric acid is producing 1 mole of magnesium chloride.
So, 3.38 moles of hydrochloric acid will react with = [tex]\frac{1}{2}\times 3.38=0.169moles[/tex] of magnesium chloride.
Now, calculating the mass of magnesium chloride by using equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Molar mass of magnesium chloride = 95.21 g/mol
Moles of magnesium chloride = 0.169 moles
Putting values in above equation, we get:
[tex]0.169mol=\frac{\text{Mass of magnesium chloride}}{95.21g/mol}\\\\\text{Mass of magnesium chloride}=16.09g[/tex]
Hence, the mass of magnesium chloride produced in the given reaction is 16.09 grams.
Part a how many milliliters of liquid does the smaller graduated cylinder contain? express your answer in milliliters using the proper number of significant figures.
You can see the volume to the bottom of the meniscus. Upon seeing and reading it all you can say is that it is less than 3.6 mL and more than 3.4 mL. So, from what can I see it is 3.54 mL to the bottom of the meniscus.
Final answer:
The amount of liquid in the smaller graduated cylinder is measured by reading at the bottom of the meniscus, with the value estimated to the nearest tenth of a milliliter. To accurately measure 9.7 mL of water, a graduated cylinder is used, allowing for readings with three significant figures. Significance in measurements is determined by the precision of the measuring device.
Explanation:
To determine how many milliliters of liquid the smaller graduated cylinder contains, one should make a reading at the bottom of the meniscus. When measuring the volume of liquid in a graduated cylinder, you must mentally subdivide the distance between the milliliter marks to estimate the measurement more precisely. If the meniscus falls between the 21 and 22 mL marks, you estimate to the nearest tenth of a milliliter to measure the volume as accurately as possible.
For instance, if you are to deliver 9.7 mL of water, you would use a graduated cylinder with markings adequate to measure to the nearest tenth of a milliliter, allowing you to read the volume with three significant figures. This is because graduated cylinders are typically precise enough to measure small amounts in milliliters with that level of precision.
To convert to milliliters and consider significant figures, remember that when working with measured quantities, like the volume of 22.4 L/mol for molar volume, three significant figures is typically the maximum number of significant figures used. Therefore, when reading a graduated cylinder, always consider the precision of the device to determine the correct number of significant figures to report for your measurement.
What is the basic form of matter which cannot be broken down any further?
In chemistry, the most basic form of matter which can't be broken down further by conventional chemical methods is an element, specifically its atoms. They are represented on the Periodic Table and have a unique number of protons.
Explanation:In the field of Chemistry, the basic form of matter which cannot be further broken down by traditional chemical methods is known as an element. These elements are represented on the periodic table and include things such as Hydrogen, Oxygen, and Iron. An element's atoms all have the same number of protons, and this is what uniquely defines them. Therefore, when you ask about the most basic form of matter that can't be broken down any further, we are talking about these elements, or more specifically, their atoms.
Learn more about elements and atoms here:https://brainly.com/question/36868053
#SPJ12
Why is it important in an ideal simple experiment to change only one variable from trial to trial?
In experiments, only one variable is changed at a time to establish a clear cause-and-effect relationship between the changed variable and the observed result. This approach is known as the control method.
Explanation:In an ideal simple experiment, it is important to change only one variable from trial to trial to confirm the resulting impact is solely due to that one specific variable. This is because experiments are conducted to identify the cause-and-effect relationships between variables. Changing only one variable at a time (while keeping others constant) establishes a clear relationship between the changed variable and the observed result. If multiple variables are changed simultaneously, it would be challenging to decipher which variable caused the observed change in results. This approach of changing one variable at a time is also referred to as the control method.
Learn more about Control method here:https://brainly.com/question/24778201
#SPJ2
Draw an atom including a nucleus and five energy levels that electrons could occupy
An atom of boron contains five electrons. The first shell is filled with 2 electrons and the second shell will hold the remaining 3 electrons. The fifth electron will occupy a 2p orbital.
Explanation:An atom of boron with atomic number 5 contains five electrons. The first shell, n = 1, is filled with 2 electrons, and the second shell, n = 2, can hold up to 8 electrons. Since boron only has 5 electrons, 3 electrons will occupy the n = 2 shell. The fifth electron will then occupy the next energy level, which is a 2p orbital.
There are three degenerate 2p orbitals with magnetic quantum numbers m₁ = −1, 0, +1. The electron can occupy any one of these p orbitals. When drawing an orbital diagram, we include empty boxes to represent the p orbitals in the same subshell that we are filling.
Learn more about Atom Energy Levels here:https://brainly.com/question/38401227
#SPJ3
Determine the number of molecules present in 4.56 mol of nitrogen (n2).
What is the only thing in nature that can be a solid a liquid or a gas?
If a sample of ammonium nitrate yields 0.50 mol h2o, how many moles of n2o are formed
Write net ionic equation to show the reaction of aqueous hg2(no3)2 with aqueous sodium chloride to form solid hg2cl2 and aqueous sodium nitrate.
Final answer:
The net ionic equation for the reaction is Hg2^2+(aq) + 2Cl-(aq) → Hg2Cl2(s).
Explanation:
The net ionic equation for the reaction between aqueous Hg2(NO3)2 and aqueous sodium chloride to form solid Hg2Cl2 and aqueous sodium nitrate is as follows:
Hg2^2+(aq) + 2Cl-(aq) → Hg2Cl2(s)
This net ionic equation represents the actual chemical change that occurs in the reaction, focusing only on the species that are directly involved in the formation of the solid product and neglecting the spectator ions. The balanced molecular equation and complete ionic equation for this reaction include the spectator ions but are not essential to represent the fundamental chemical change.
why do scientists state that an atom is mostly empty space
Hydrogen has three naturally occurring isotopes which figure into the average atomic mass found on the periodic table (1.00974): hydrogen-1, hydrogen-2, and hydrogen-3. Which would you guess is most abundant? Explain your answer
The most abundant isotope of hydrogen is hydrogen-1, also known as protium, which accounts for over 99.98% of naturally occurring hydrogen, because its mass is closest to hydrogen's average atomic mass on the periodic table.
Explanation:The most abundant isotope of hydrogen is hydrogen-1 (protium, 1H), which has one proton and no neutrons. This abundance is reflected in the atomic mass of hydrogen on the periodic table, which is approximately 1.008 amu. Since hydrogen-1 is closest to this average atomic mass, it is the most prevalent isotope. Protium represents over 99.98% of naturally occurring hydrogen. In contrast, hydrogen-2 (deuterium, 2H) with one neutron, and hydrogen-3 (tritium, 3H) with two neutrons, are much rarer. Deuterium occurs about 1 in every 10,000 hydrogen atoms, and tritium is even more scarce and is radioactive.
what are two main forms of energy given off when paper burns and where does the energy come from
Consider the burning of gasoline and the evaporation of gasoline. which process represents a chemical change and which represents a physical change?
Chemical and physical changes are characterized by the formation and conversion of the state of matter. The burning of gasoline is chemical and its evaporation is a physical change.
What are physical and chemical changes?Physical change has been defined as the alteration of the physical properties of substances that might include volume, size, shape, density, mass, etc. They are reversible and can be converted back to their original state. The evaporation of gasoline involves the conversion of liquid into gas.
On the other hand, chemical change involves the combination, substitution, and deletion of the atoms of the compound to form an irreversible product. The new product formed has different properties. The burning of gasoline produces carbon dioxide and water.
Therefore, the burning of gasoline is a chemical change, whereas evaporation is a physical change.
Learn more about chemical and physical change, here:
https://brainly.com/question/11321843
#SPJ2
What is the hybridization of sb in the molecule sbcl52–? antimony (sb) can accept up to twelve electrons?
The valence electron configuration for antimony (Sb) is:
Sb = 5s²5p³5d⁰
In SbCl₅²⁻, antimony has a -2 charge i.e. it has 2 additional electrons
Sb²⁻ = 5s²5p⁵5d⁰
Following a two electron transition from p→d orbital we have:
Sb²⁻ = 5s²5p³5d²
There is a total of 5 unpaired electrons (3 in the p and 2 in the d) which can form five bonds with the 5 Cl atoms.
Thus the hybridisation of Sb in SbCl₅²⁻ is sp³d²
The hybridization of [tex]{\text{SbCl}}_5^{2 - }[/tex] is [tex]\boxed{{\text{s}}{{\text{p}}^3}{{\text{d}}^2}}[/tex]. Antimony (Sb) can accept 12 electrons.
Further Explanation:
Prediction of hybridization:
The hybridization can be determined by calculating the number of hybrid orbitals (X) which is formed by the atom. The formula to calculate the number of hybrid orbitals (X) is as follows:
[tex]\boxed{{\text{X = }}\frac{1}{2}\left[ {{\text{VE}} + {\text{MA}} - c + a} \right]}[/tex]
Where,
VE is a total number of valence electrons of the central atom.MA is total number of monovalent atoms/groups surrounding the central atom.c is the charge on the cation if the given species is a polyatomic cation.a is the charge on the anion if the given species is a polyatomic anion.Note: In MA only monovalent species should be considered and for divalent atoms or groups MA is equal to zero.
Generally, the least electronegative atom is considered as the central atom. Calculate the hybridization as follows:
1. If the value of X is 2 then it means two hybrid orbitals are to be formed and thus the hybridization is sp.
2. If the value of X is 3 then it means three hybrid orbitals are to be formed and thus the hybridization is [tex]s{p^2}[/tex].
3. If the value of X is 4 then it means four hybrid orbitals are to be formed and thus the hybridization is [tex]s{p^3}[/tex].
4. If the value of X is 5 then it means five hybrid orbitals are to be formed and thus the hybridization is [tex]s{p^3}d[/tex].
5. If the value of X is 6 then it means six hybrid orbitals are to be formed and thus the hybridization is [tex]s{p^3}{d^2}[/tex].
The ground state electronic configuration for antimony (Sb) is [tex]\left[ {{\text{Kr}}} \right]{\text{ }}4{d^{10}}5{s^2}5{p^3}[/tex]
Therefore, the valence electrons associated with antimony (Sb) atom are 5.
Since chlorine is a monovalent atom thus the total number of monovalent atoms surrounding the central atom (MA) is 5.
Since the molecule is an anionic species and has -2 charge thus the value of a is 2.
Substitute these values in the above formula.
[tex]\begin{aligned}{\text{X}}&=\frac{1}{2}\left[{{\text{VE}}+{\text{MA}}-c+a}\right]\\&=\frac{1}{2}\left[{{\text{5}}+{\text{5}}-0+2}\right]\\&=\frac{1}{2}\left[{12}\right]\\&=\boxed6\\\end{aligned}[/tex]
Since the value of X is 6, it means 6 hybrid orbitals are to be formed and therefore the hybridization of [tex]{\mathbf{SbCl}}_{\mathbf{5}}^{{\mathbf{2}} - }[/tex] is [tex]{\mathbf{s}}{{\mathbf{p}}^{\mathbf{3}}}{{\mathbf{d}}^{\mathbf{2}}}[/tex].
The formula to calculate total number of valence electrons of [tex]{\mathbf{SbCl}}_{\mathbf{5}}^{{\mathbf{2}} - }[/tex] is as follows:
Total valence electrons= [(1) (Valence electrons of Sb) + (5) (Valence electrons of Cl) + Negative charge]
[tex]\begin{aligned} {\text{Total valence electrons}}\left({{\text{TVE}}}\right)&=\left[{\left({\text{1}}\right)\left({\text{5}}\right)+\left({\text{5}}\right)\left({\text{7}}\right)+\left(2\right)}\right]\\&=42\\\end{aligned}[/tex]
According to the Lewis structure of [tex]{\text{SbCl}}_{\text{5}}^{2 - }[/tex] ( refer to the image attached) central atom, Sb has an expanded valence shell in which 12 electrons are present. Therefore, Antimony (Sb) can accept 12 electrons.
Learn more:
1. Molecular shape around the central atoms in the amino acid glycine: https://brainly.com/question/4341225
2. Component of John Dalton’s atomic theory:https://brainly.com/question/2357175
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Covalent bonding and molecular structure
Keywords: Hybridization, antimony, geometry, sp3d2, steric number, 6,d orbital, SbCl52-, Lewis structure, hybridization of SbCl52-, central atom, chlorine, shape, d2sp3, total valence charge.
Which molecule is less soluble in water--a fat or a phospholipid? why? which molecule is less soluble in water--a fat or a phospholipid? why? a fat molecule is less soluble in water because it has more carbons and hydrogens than a phospholipid. a phospholipid is less soluble in water because it is smaller than a fat molecule. a fat molecule is less soluble in water because it has three non-polar fatty acids and no polar or charged head like a phospholipid has. a phospholipid is less soluble in water because even though it has one end that is hydrophilic, the end that is hydrophobic is larger?
Answer: Option (c) is the correct answer.
Explanation:
A fat is defined as a substance which is highly soluble in organic solvents but it is largely insoluble in water.
These molecules are less soluble in water because it contains three non-polar fatty acids and no polar or charged head like a phospholipid has.
On the other hand, a phospholipid molecule contains a hydrophilic head that is highly soluble in water.
Hence, due to the presence of hydrophilic group a phospholipid is soluble in water.
Thus, we can conclude that a fat molecule is less soluble in water because it has three non-polar fatty acids and no polar or charged head like a phospholipid has.
convert 3.8 Km/sec to miles/year
3.8 km/sec is equivalent to approximately 74,649,628.96 miles/year.
3.8 km/sec will be converted to miles/year using the formulas below: Convert km/sec to km/hour in step one.We must multiply km/sec by 3600 (the number of seconds in an hour) in order to translate km/sec to km/hour.3.8 km/sec divided by 3600 equals 13680 km/h.
Step 2: Convert from km/h to mi/h.
We must divide km/hour by 1.609344 (the number of kilometres in a mile) to convert km/hour to miles/hour.8508.856 miles per hour (13680 km/h x 1.609344)3. Convert miles per hour to miles per year.
We must multiply miles/hour by 8760 (the number of hours in a year) in order to convert miles/hour to miles/year.8760 divided by 8508.856 equals 74649628.96 miles per year.3.8 km/sec is therefore comparable to roughly 74,649,628.96 miles per year.
Learn more about distance conversion, here:
https://brainly.com/question/31592989
#SPJ6