Pizza is a heterogeneous mixture because the different components are not evenly distributed throughout the mixture.
Pizza is a heterogeneous mixture. A heterogeneous mixture is a mixture in which the components are not evenly distributed throughout the mixture. This means that the different components of pizza, such as the sauce, cheese, and toppings, can be easily distinguished from each other.
Pizza is not an element, because an element is a pure substance that cannot be broken down into simpler substances by chemical means. Pizza is also not a compound, because a compound is a substance that is made up of two or more elements that are chemically bonded together.
The components of pizza are not chemically bonded together, so they can be easily separated. For example, the cheese can be removed from the pizza, and the sauce can be removed from the pizza. This shows that pizza is a heterogeneous mixture.
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Which quantity is used to generate the error bars on a graph?
What is nacl monosaccharide disaccharide organic or inorganic?
Aluminum and sulfur will combine to make a compound.
Al_S_
Fill in the blanks with the number of the subscript.
Suppose that a fictitious element, x, has two isotopes: 59x (59.015 amu) and 62x (62.011 amu). the lighter isotope has an abundance of 71.7%. calculate the atomic mass of the element x.
The atomic mass of the element would simply be equal to the sum of the weighted average of each isotope, that is:
atomic mass = 59.015 amu * 0.717 + 62.011 amu * (1 – 0.717)
atomic mass = 59.863 amu
From the options provided for each element below, choose the properties that it may have based on its location in the periodic table.
Magnesium (Mg):
less reactive than sodium
dull
a gas
Answer:
1. less reactive than sodium
Explanation:
Which physical method can separate a mixture of steel ball bearings and marbles?
How are the isotopes of a particular element alike?
Isotopes of a particular element are alike in that they all have the same atomic number which means they have the same number of protons. However, they differ in the number of neutrons.
Explanation:The isotopes of a particular element are alike in that they all have the same number of protons in the nucleus, hence, they are all part of the same atomic family and share the same atomic number. This determines the element's position in the periodic table and its chemical properties. For example, all isotopes of Hydrogen - Protium, Deuterium and Tritium - have one proton each.
However, isotopes of a same element differ in their number of neutrons. For instance, while Protium has no neutrons, Deuterium has one and Tritium has two.
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Which is more volatile benzene or toluene?
Which statement correctly describes the relationship between reactant and yield?
A. The actual yield is calculated from the amount of the excess reactant present
B. The actual yield is calculated from the amount of the limiting reactant present.
C. The theoretical yield is calculated from the amount of the excess reactant present.
D. The theoretical yield is calculated from the amount of the limiting reactant present.
Answer:
The theoretical yield is calculated from the amount of the limiting reactant present.
Explanation:
The limiting reactant is one which is present in lesser amount than the other reactant (based on molar ratio requirement)
For example in formation of water we need one mole of hydrogen gas and half moles of oxygen gas. Now we have one mole of hydrogen gas and one mole of oxygen gas then the limiting reagent is hydrogen gas.
theoretical yield is the expected yield of a reaction calculated based on the moles or amount of limiting reagent present as the limiting reagent is going to be completely consumed during the reaction.
Answer : The correct option is, (D) The theoretical yield is calculated from the amount of the limiting reactant present.
Explanation :
Excess reagent : It is defined as the reactants not completely used up in the reaction.
Limiting reagent : It is defined as the reactants completely used up in the reaction.
Theoretical yield : It is calculated from the amount of the limiting reagent present in the reaction.
Actual yield : It is experimentally determined.
Hence, the correct option is, (D) The theoretical yield is calculated from the amount of the limiting reactant present.
What is the charge on an ion that has an atomic number of 24 and contains 22e-?
The atomic number actually represents the number of electrons in the atom. So when the atomic number is 24 and the actual number of electron is only 22, so this means that there is a deficit of 2 electrons. Hence the charge must be positive 2.
Answer:
2+
The number of which subatomic particle changes to create an isotope?
Ow many sulfur atoms are in 1.10 mol of aluminum sulfide?
Aluminum sulfide is Al₂S₃, which shows that there are 3 sulfur atoms per formula unit.
In one mole there is Avogadro’s number of atoms and Avogadro’s number = 6.02 x 10²³
In 1.10 mole = 1.10 x 6.02x10²³ = 6.62 x 10²³ formula units
Now multiply with 3 to get number of sulfur atoms present in 1.10 mol of Aluminum sulfide;
3 x 6.62x10²³ = 1.99 x 10²⁴
So, the answer is 1.99 x 10²⁴ sulfur atoms.
An electron that is in the highest energy level of an atom and determines the atom's chemical properties is called a(n)
paired electron.
opposite-spin electron.
valence electron.
extra electron.
The electrons in the higher energy level of an atom which determines the chemical properties of the atom and involved in chemical bonding are called the valence electrons.
What are valence electrons?An atom is composed of electrons, protons and neutrons. Protons and neutrons are located inside inside the core of atom called nucleus. Electrons are revolving around around the nucleus through circular paths of definite energy.
The regions where the electrons can be seen is called orbital. The electrons in the orbitals closer to the nucleus is called the core or inner electrons. The electrons which are in the outer shells away from the nucleus is called valence electrons.
Valence electrons are free to interact with the surrounding environment and they are participating in chemical bonding to form compounds. When the valence shells attain octet, they are said to be stable. Therefore, the atoms with electron deficient or extra electrons in the valence shell bonds with other atoms.
Therefore, the number of valence electrons determines the chemical properties of the atom.
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Which shows the correct relationship between the molecular formula and the empirical formula for C2H10N2?
The molecular formula C2H10N2 tells us that there are 2 Carbon atoms, 10 Hydrogen atoms, and 2 Nitrogen atoms in the molecules, while the empirical formula CH5N tells us that for every Carbon atom, there are 5 Hydrogen atoms and 1 Nitrogen atom. In essence, the molecular formula is a multiple of the empirical formula.
Explanation:The empirical formula represents the simplest whole-number ratio of elements in a compound. The molecular formula is derived from the empirical formula and represents the actual count of these elements in a molecule. If we take a look at the formula C2H10N2, it can be simplified to CH5N which becomes the empirical formula. The molecular formula C2H10N2 tells us that in the molecule, there are 2 Carbon atoms, 10 Hydrogen atoms, and 2 Nitrogen atoms and the empirical formula CH5N indicates that for every Carbon atom, there are 5 Hydrogen atoms and 1 Nitrogen atom in the simplest whole number ratio.
From the example given, we can see that the molecular formula is a multiple of the empirical formula. It is derived from the empirical formula by multiplying the subscripts in the empirical formula by the same integer.
So, to summarize, both the empirical and molecular formulas provide important information about a compound; the molecular formula shows the actual number of elements in a compound and the empirical formula shows the simplest whole number ratio of these elements.
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Hy is it important that a chemical equation be balanced?
How can one tell, just by looking at the titration curve of an acid titrated by a strong base (with no calculations), if the analyte was a weak acid or a strong acid?
Calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 5 to n = 3 state
The wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 5 to n = 3 state is 1280nm.
What is wavelength ?The term wavelength defined as the distance between the two successive crests or troughs of the wave. Wavelength is denoted by the greek word lambda (λ).
The distance between the "crest" of one wave to the crest of the another wave is the wavelength. We can measure from the "trough" of one wave to the trough of the another wave we get the same value for the wavelength.
The difference in energy (E) between two shells calculated as follows:
ΔE = -RH [(1 / nf2) - (1/ni2)] ΔE
= -2.18 x10-18 J [(1/32) - (1/52)] ΔE
= -1.55 x10-19 JE
hc/λλ = hc/Eλ
= [(6.63 x10-34 J.s.) x (3.00 x1017 nm/s)] /(1.55 x10-19 J)
λ = 1280nm
Thus, The wavelength of a photon emitted by a hydrogen atom when its electron drops from the n = 5 to n = 3 state is 1280nm.
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Formula New Combination Predicted Formula
Cu₂O silver + oxygen Ag₂O
NaCl potassium + chlorine
AlCl₃ aluminum + fluorine
CO₂ tin + oxygen
MgCl₂ calcium + bromine
HCl cesium + iodine
CCl₄ silicon + bromine
The student's question involves predicting the formulas of new combinations of elements to form binary ionic compounds. The correct formulas are based on the charges of the ions, aiming for a neutral overall charge. Examples include KCl for potassium + chlorine, AlF3 for aluminum + fluorine, and SnO2 for tin + oxygen.
Explanation:The student is asking for the predicted formulas of new chemical combinations by replacing elements in known compounds utilizing the rules for writing formulas of binary ionic compounds. The key to solving this problem is to balance the charges of the ions so that the overall charge of the compound is neutral. When predicting the formulas, we need to consider the valency or oxidation states of the elements involved. For example, if potassium (K) replaces sodium (Na) in sodium chloride (NaCl), since both have a +1 charge, the new formula would be KCl. Following a similar process, substituting aluminum (Al) for aluminum in aluminum fluoride (AlCl3) with fluorine (F), considering aluminum has a +3 charge and fluorine has a -1 charge, results in the formula AlF3. The charge of tin (Sn) is +2 or +4, but when combined with oxygen (O), which has a -2 charge, a likely compound could be SnO2, assuming tin is in the +4 oxidation state.
Let's predict the remaining chemical formulas based on the initial list:
How many moles of c9h8o4 are in a 0.300 g tablet of aspirin?
The number of moles of C9H8O4 in a 0.300g aspirin tablet can be found by using the formula: moles = mass/molar mass. The molecular mass of aspirin (C9H8O4) is 180.15 amu. Therefore, the calculation yields approximately 0.0017 mole of aspirin in the tablet.
Explanation:To determine the number of moles of C9H8O4 in a 0.300g tablet of aspirin, you must apply the concept of molar mass in reverse. The average molecular mass of an aspirin molecule, C9H8O4, is the sum of the atomic masses of nine carbon atoms, eight hydrogen atoms, and four oxygen atoms, which amounts to 180.15 amu.
One mole of any substance contains 6.02 x 10^23 molecules or formula units. This amount is known as Avogadro's number. Therefore, the molar mass of a substance in grams per mole is numerically equal to the substance’s molecular weight in atomic mass units.
So, to find the number of moles in 0.300g of aspirin, you would use the formula: moles = mass/molar mass. Thus, moles of aspirin = 0.300 g / 180.15 g/mole ≈ 0.0017 mole.
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What is the value of the smallest bond angle in icl4−? enter the smallest bond angle of the molecule?
Answer : The value of the smallest bond angle in [tex]ICl_4^-[/tex] is, [tex]90^o[/tex]
Explanation :
Formula used :
[tex]\text{Number of electrons}=\frac{1}{2}[V+N-C+A][/tex]
where,
V = number of valence electrons present in central atom
N = number of monovalent atoms bonded to central atom
C = charge of cation
A = charge of anion
First we have to determine the hybridization of the given molecule, [tex]ICl_4^-[/tex].
[tex]\text{Number of electrons}=\frac{1}{2}\times [7+4+1]=6[/tex]
The number of electrons is 6 that means the hybridization will be [tex]sp^3d^2[/tex] and the electronic geometry of the molecule will be octahedral.
But as there are four atoms around the central atom iodine, the fifth and sixth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be square planar and the bond angle between the lone pair and the lone pair will be, [tex]180^o[/tex] and the bond angle between the lone pair and the bond pair will be, [tex]90^o[/tex].
The structure of the given molecule is shown below.
Hence, the value of the smallest bond angle in [tex]ICl_4^-[/tex] is, [tex]90^o[/tex]
According to molecular geometry,the value of the smallest bond angle in given compound is 90°.
Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
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Compare the two atoms: 188 'X' and 178 'Y'. How are these atoms related?:
a. They are atoms of different elements
b. They have the same number of neutrons
c.They have different numbers of protons
d. They are isotopes of the same element
Select the correct statement to describe when a sample of liquid water vaporizes into water vapor.
A. Temperature decreases and molecular motion increases while shape becomes less defined.
B. Temperature decreases and molecular motion decreases while shape becomes more defined.
C. Temperature increases and molecular motion decreases while shape becomes more defined.
D. Temperature increases and molecular motion increases while shape becomes less defined.
What are lipids made of and what are they used for chemistry?
Explain how the bonding properties of carbon atoms results in the large variety of carbon-based molecules n living things
What reason does john proctor give for his reluctance to regularly attend church? What is another likely reason he hasn't been attending?
Another likely reason that he hasn't been attending is that he is ashamed of his affair with Abigail. He doesn't want to see her or be seen with her, so he is avoiding her.
Proctor's lack of regular church attendance was caused by his dread. They claim that you will go to hell if you don't attend church. His excuse for skipping church is that his wife is ill as well. If Parris is saying this, he probably has more important things to do, like taking care of his ailing wife.
When Hale inquires as to why John doesn't attend church frequently, he replies that his wife has been ill and that he detests Parris' displays of materialism. Ironically, when Hale asks Proctor to list his commandments, the only one he overlooks is adultery. Hale is not content.
Proctor is asked by Danforth if he has ever seen the Devil. Parris jumps in and accuses Proctor of rarely going to church.
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Hat is the difference between h+ concentration in an acidic solution such as lemon juice (ph 2) and a basic solution such as household bleach (ph 13)?
List the earth names for the 30 alien elements
Why does it take longer to boil water then melt ice?
1: Copper has an atomic number of 29
that means there are 29 protons in the nucleus of each upper atom. That's what the atomic nuber is; the number of protons in an atom of a ceartain element
if one copper atom contains 29 protons, how many electrons are there in 4 atoms of copper?
2: Copper has an atomic number of 29
that means there are 29 protons in the nucleus of each upper atom. That's what the atomic nuber is; the number of protons in an atom of a ceartain element
if one copper atom contains 29 protons, how many copper atoms could you make out of 87 protons?
Copper has an atomic number of 29, 4 copper atoms contain 116 electrons, while 3 copper atoms can be formed from 87 protons.
The atomic number of an element tells us the number of protons in an atom of that element.
1. Since copper has an atomic number of 29, each copper atom has 29 electrons as well. To find the total number of electrons in 4 atoms of copper, we can simply multiply the number of electrons in one copper atom by 4.
So, there are 4 [tex]\times[/tex] 29 = 116 electrons in 4 atoms of copper.
2. Since each copper atom has 29 protons, we can divide the total number of protons by 29 to find the number of copper atoms that can be made.
[tex]\dfrac{87}{29} = 3[/tex]
So,87 protons can make 3 copper atoms.
Therefore, there are 116 electrons in 4 atoms of copper and 3 copper atoms can be made out of 87 protons, respectively.
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2H2 +O2 → 2H2O
What mass of water forms when 1.45 × 10-3 g O2 react completely? (Molar mass of O2 = 32.00 g/mol; molar mass of H2O = 18.02 g/mol)
1.63 × 10-3 g
8.16 × 10-4 g
1.29 × 10-3 g
Answer : The correct option is, [tex]1.63\times 10^{-3}g[/tex]
Explanation : Given,
Mass of oxygen gas = [tex]1.45\times 10^{-3}g[/tex]
Molar mass of oxygen gas = 32 g/mole
Molar mass of water = 18.02 g/mole
First we have to calculate the moles of [tex]O_2[/tex].
[tex]\text{Moles of }O_2=\frac{\text{Mass of }O_2}{\text{Molar mass of }O_2}=\frac{1.45\times 10^{-3}g}{32g/mole}=4.53\times 10^{-5}moles[/tex]
Now we have to calculate the moles of [tex]H_2O[/tex].
The balanced chemical reaction is,
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
From the balanced reaction we conclude that
As, 1 mole of [tex]O_2[/tex] react to give 2 mole of [tex]H_2O[/tex]
So, [tex]4.53\times 10^{-5}[/tex]moles of [tex]O_2[/tex] react to give [tex]4.53\times 10^{-5}\times 2=9.06\times 10^{-5}[/tex] moles of [tex]H_2O[/tex]
Now we have to calculate the mass of [tex]H_2O[/tex]
[tex]\text{Mass of }H_2O=\text{Moles of }H_2O\times \text{Molar mass of }H_2O[/tex]
[tex]\text{Mass of }H_2O=(9.06\times 10^{-5}mole)\times (18.02g/mole)=1.63\times 10^{-3}g[/tex]
Therefore, the mass water produced is, [tex]1.63\times 10^{-3}g[/tex]