To count atoms, we can find the total sum of the subscripts in a chemical compound.
This is the case for most compounds. In some cases, we will have to multiply subscripts when there are elements inside brackets.
Solving the QuestionWe're given:
Li₂SO₂
In front of lithium (Li), there is a 2.
In front of sulfur (S), there is nothing, which means 1.
In front of oxygen (O), there is a 2.
Add:
2 + 1 + 2 = 5
Therefore, there are 5 atoms in Li₂SO₂.
Answer5 atoms
5) Which of the following is NOT a characteristics of an acid?
Proton donors
Has low ph
Has high ph
Release hydrogen ions H plus
The following is NOT a characteristics of an acid is has high pH
An acid is the substances in water solution taste sour changes blue litmus paper to red react with some metal to liberate hydrogen and also react with base to form salt and promote chemical reaction and here in the given option the incorrect is high pH because acid has low pH and pH is less than 7 is acidity and more than 7 is basicity and pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water and water that has more free hydrogen ions is acidic whereas water that has more free hydroxyl ions is basic
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Balance the equation
type your answer...
Previous
H₂+ type your answer...
O2 type your answer...
H₂O
The balanced equation
2H2 +O2 =====> 2H2O
What is balanced equation ?
An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have an equal balance of mass and charge.
The balanced equation
2H2 +O2 =====> 2H2O
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What is the empirical formula for sulfur dioxide?A. SDO B. SD C. S2O2 D. SO2
Explanation:
We have to find the empirical formula for sulfur dioxide. The compound contains two elements: Sulfur and oxygen.
As it name says, it is a dioxide, it means that one molecule of the compound contains two atoms of O.
The empirical formula of sulfur dioxide is: SO₂.
Answer: d. SO₂.
Which two elements would have the same number of energy levels
The elements with the same number of energy levels are the ones that belong to the same period of the periodic table.
Copper and Zinc both belong to the 4th period of the periodic table.
Nickel belongs to the 4th period and palladium to the 5th period.
Lithium belongs to the 2nd period and Magnesium to the 3rd period.
It means that the correct answer is Copper and Zinc, they belong to the same period,
What happens when you cover burning candles with different size glass containers?
Answer:
eventually, they'll always stop burning - how long that takes depends on the glass size
Explanation:
the candle stops burning once it consumes all the oxygen inside the glass. the bigger the glass, the more oxygen there is, but eventually, even that will run out. so, smaller glass means faster, larger slower.
hope that helps
Give the number of valence electrons in krypton. Write out the electronic configuration for the valence electrons. Valence electrons: _______ Electronic configuration for the valence electrons: ________
ANSWER
[tex]\begin{gathered} \text{ Valence electrons; 8} \\ \text{ Electronic configuration for the valence electrons; 4s}^2\text{ 4p}^6 \end{gathered}[/tex]EXPLANATION
Krypton is an example of a noble gas. Noble gases are not reactive because their octet state has been completely filled. Krypton belongs to group 0 or 18.
Since the octet state is completely filled, then the number of electrons at the outermost shell is 8
Therefore, the valence electrons of Krypton is 8
The electronic configuration of the valence electron is written below as
[tex]\text{ 4s}^24p^6[/tex]Suppose 2.68 g of barium acetate is dissolved in 300. mL of a 45.0 m M aqueous solution of ammonium sulfa
Calculate the final molarity of acetate anion in the solution. You can assume the volume of the solution doesn't
acetate is dissolved in it.
Round your answer to 3 significant digits.
The term "total moles of a solute contained in a kilogram of a solvent" is used to describe molality. Molal concentration is another name for molality. It is a measurement of a solution's solute concentration.
What is the molarity unit?Molarity is a unit of measurement for the concentration of a material in a specific volume of solution (M). The amount of a solute in one liter of solution is known as its molarity. The molarity of a solution is sometimes referred to as its molar concentration.
As a result, we start by assuming that the reaction is finished and that its volume is constant.
The following is the balanced stoichiometric equation:
BaSO4 + 2NH4(CH3COO) = Ba(CH3COO)2 + (NH4)2SO4.
First, we must identify the surplus reactant and the one that the process has entirely consumed.
For Ba(CH3COO)2,
The formula for moles is (Mass/) (Molar Mass)
Mass of barium acetate is 2.68 g.
Molar mass of barium acetate is 255.43 g/mol.
There are 0.0104 moles, or (2.68/255.43), in total.
Number of moles for (NH4)2SO4 = (Concentration in mol/L) (Volume in L)
Ammonium surface concentration in mol/L is 45 M.
(300/1000) x volume in L = 0.3 L
45 divided by 0.3 to equal 13.5 moles.
According to the reaction's stoichiometric balance, 1 mole of Ba(CH3COO)2 produces 1 mole of (NH4)2SO4.
Ba(CH3COO)2 produces 2 moles of NH4(CH3COO) from 1 mole.
Ba(CH3COO)2 will provide 2 0.0591 moles of NH4(CH3COO), or 0.1182 moles of NH4(CH3COO), from 0.0591 moles of Ba(CH3COO)2.
If NH4(CH3COO) has a molarity, give the number of moles. Volume in L
0.1182 moles are the number of moles.
0.3 L is equal to L of the solution.
NH4(CH3COO) has a molarity of (0.01182/0.3) = 0.0394 M.
Consider that 0.0394 M of NH4(CH3COO) likewise contains 0.0394 M of acetate ion because 1 mole of NH4(CH3COO) includes 1 mole of acetate ion.
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can someone please help me with 28 A!
Answer: The answer for 28 A is [tex][He]2s^2 2p^2[/tex]
28 B is [tex]1s^2 2s^2 2p^1[/tex]
an avocado can be a simple model of the structure of a cell.
which cell structure is represented by the avocado's skin.
The body of avocado fruit can be compared with the cell structure. The skin of the avocado is relatable with the cell membrane. Thus option B is correct.
What is cell?Cell is the basic unit of life. Cells connect together to forms tissues and tissues forms organs and a group organs forms an organ system. These different organ systems buildup the whole body.
Cell contains the core called nucleus. Inside the nucleus genetic material DNA, ribosomes, Golgi apparatus, lysosomes etc are located. The function of cell membrane is to protect the cell from damages as the skin do for our body.
In plants unlike animals, their cell is protected by a cell wall apart from cell membrane and various other differences are there in the cell structure of plant cells.
The fluid filled portion of cell is called cytoplasm. The inner content of the avocado fruit is comparable with the cytoplasm and its seed can be considered as the model for nucleus.
Therefore, the avocado's skin represents the cell membrane. Hence, option B is correct.
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Which of the following statements about effective nuclear charge is true?
Electrons in the same shell screen each other much more than those in core shells.
The valence electrons are very effective in screening the core electrons from the full charge of
the nucleus.
The effective nuclear charge experienced by valence electrons increases as we move right to
left across a period.
The effective nuclear charge experienced by valence electrons increases as we move left to
right across a period.
The valence electrons are very effective in screening the core electrons from the full charge of the nucleus statements about effective nuclear charge is true
Effective nuclear charge: What is it?The attractive positive charge of nuclear protons acting on valence electrons is known as effective nuclear charge. Due to the shielding effect, the effective nuclear charge is always smaller than the total amount of protons in a nucleus. In comparison to all other periodic table trends, effective nuclear charge lags behind.
Although a fluorine atom's nucleus has a 9-volt charge Z, the core electrons—four from the 1s and 2s orbitals—and some of the 7 electrons in the 2p orbitals—screen the valence electrons noticeably. Therefore, the cation of sodium has the highest effective nuclear charge.
Effective nuclear charge lowers down a group and rises from left to right across a period in the periodic table.
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What is the transfer of thermal energy between objects?A. HeatB. HotC. TemperatureD. Cold
Thermal energy is transferred from a hot body (higher temperature) to a colder body (lower temperature). In these energy exchanges, two types of changes are observed: temperature or physical state. These variations occur both with energy intake and loss. What is being transferred between the two bodies is heat.
Answer: A. Heat.
Farmers use primarily two fertilizers - ammonium nitrate and ammonium phospate. Which contains a greater percentage of nitrogen by mass? Write the formula for ammonium nitrate:-----------------------------------------------------------||________________________________First, let's add up the total molar mass of ammonium nitrate below:-----------------------------------------------------------||________________________________Now, let's calculate the percentage of nitrogen in ammonium nitrate:-----------------------------------------------------------||________________________________Now, let's write the formula for ammonium phosphate:-----------------------------------------||______________________First, let's add up the total molar mass of ammonium phosphate below:-----------------------------------------------------------||________________________________Now, let's calculate the percentage of nitrogen in ammonium phosphate:-----------------------------------------------------------||________________________________Which contains a greater percentage of nitrogen by mass?
The nitrogen in ammonium nitrate contains a greater percentage of nitrogen by mass
Explanations:The formula for ammonium nitrate is given as NH4NO3.
Determine the molar mass of NH4NO3
Molar mass = 14 + 4(1) + 14 + 3(16)
Molar mass .= 14 + 4 + 14 + 48
Molar mass of NH4NO3 = 80g/mol
Determine the percentage of nitrogen in the compound
%N = 28/80 * 100
%N = 35%
The formula for ammonium phosphate is (NH4)3PO4
Determine the molar mass of (NH4)3PO4
Molar mass = 3(14) + 4(3) + 4(16) + 3(31)
Molar mass = 42 + 12 + 64 + 31
Molar 1ass = 149g/mol
Determine the percentage of nitrogen in ammonium phosphate:
%N = 42/149 * 100
%N = 28.18%
Hence the nitrogen in ammonium nitrate contains a greater percentage of nitrogen by mass
What is a quasar?
Two stars moving around each other.
A star that emits a repeated radio signal.
A star that emits intense radio and light energy.
A system of stars held together by gravity.
A collapsed star emitting no light.
A quasar is a star that emits intense radio and light energy.
A quasar is an extremely bright radio source. It is called a quasi-stellar radio source. It appears to be like a star but is not a star. These quasars are young galaxies that are located far away from us and are highly luminous. The luminosity of a quasar is 1000 times greater than the luminosity of a milky way galaxy.
A quasar is powered by a supermassive black hole with its mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc.
The quasars were first discovered in the 1950s using the Hubble space telescope and were found to be a massive bright source emitting radio waves of unknown origin. But now, millions of quasars were discovered.
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I need your help with this question
No need explaining just say the answer thanks
Answer: CHOCH
The third one
Explanation:
If I begin with 13.5G of aluminum. How much will I need? I picked B but I’m not sure if I’m correct
Explanation:
Aluminum will react with chlorine gas according to the following reaction:
2 Al (s) + 3 Cl₂ (g) ----> 2 AlCl₃
We have to find the mass of Cl₂ that will completely react with 13.5 g of Al. First we have to convert the mass of Al to moles using its molar mass.
molar mass of Al = 26.98 g/mol
moles of Al = 13.5 g * 1 mol/(26.98 g)
moles of Al = 0.500 mol
2 Al (s) + 3 Cl₂ (g) ----> 2 AlCl₃
Now, according to the coefficients of the reaction, 2 moles of Al will react with 3 moles of Cl₂. So the molar ratio between them is 2 to 3. We can use that relationship to find the number of Cl₂ that will react with 0.500 mol of Al.
2 mol of Al : 3 moles of Cl₂ molar ratio
moles of Cl₂ = 0.500 mol of Al * 3 moles of Cl₂/(2 moles of Al)
moles of Cl₂ = 0.750 mol
And finally we can convert back to grams using the molar mass of Cl₂.
molar mass of Cl₂ = 70.91 g/mol
mass of Cl₂ = 0.750 moles * 70.91 g/(1 mol)
mass of Cl₂ = 53.2 g
Answer: a. 53.2 g of Cl₂ for complete reaction.
How do you solve the decomposition of aluminum oxide?
Aluminum Oxide decomposes to Aluminum metal and Oxygen gas.
- First, write down each compound:
[tex]Al_2O_3\longrightarrow Al+O_2[/tex]- Second, write the number of moles of each compound, so that we have the same amount of reactants as products. Here, it is important not to change the subscript of compound elements.
For example, let's start by adding a number 2 in front of the aluminum metal to balance:
[tex]Al_2O_3\text{ }\rightarrow2Al+O_2[/tex]So far, the amount of aluminum has been balanced but the amount of oxygen is unbalanced, so let's add a number 3 for the oxygen gas.
[tex]Al_2O_3\text{ }\rightarrow2Al+3O_2\text{ }[/tex]Now, to have the same amount of moles of oxygen on both sides, let's put a number 2 in the aluminum oxide:
[tex]2Al_2O_3\text{ }\rightarrow2Al+3O_2[/tex]Here, the amount of aluminum moles is unbalanced, so we add a number 4 for the aluminum metal to balance:
[tex]2Al_2O_3\text{ }\rightarrow4Al+3O_2[/tex]- This is the final balanced equation of decomposition of aluminum oxide:
[tex]\begin{gathered} 2Al_2O_3\text{ }\rightarrow4Al+3O_2 \\ \end{gathered}[/tex]An organic compound contains carbon hydrogen and oxygen. If it contains 45.27% carbon and 4.43 % hydrogen by mass determine the empirical formula
This organic compound has in its structure the next element: C, H, and O
45.27% C
4.43 % H
The rest 100%-45.27%-4.43 = 50.3 % O
-----------------------------------------------------------------------------------------------------------------
The empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound.
Procedure:
Step 1)
We convert % into grams (g). Let's assume we have a 100g sample. Therefore,
45.27 % C = 45.27 g
4.43 % H = 4.43 g
50.3 % O = 50.3 g
Step 2)
We calculate the number of moles of each element. To do this, we need every atomic mass
For C)
[tex]45.27\text{ g x }\frac{1\text{ mol}}{12.01\text{ g}}=3.767\text{ moles}[/tex]For H)
[tex]4.43\text{ g x }\frac{1\text{ mol}}{1.00\text{ g}}=\text{ 4.43 moles}[/tex]For O)
[tex]50.3\text{ g x }\frac{1\text{ mol}}{16.0\text{ g}}=3.14\text{ moles}[/tex]Step 3)
We divide all moles by the smallest one of them (3.14 moles of O)
For C) 3.767 moles/3.14 moles = 1.19 = 1 (we need integer numbers)
For H) 4.43 moles/3.14 moles = 1.41 = 1
For O) 3.14 moles/3.14moles = 1
The empirical formula is CHO
This is the question:Fe2O3 + 3 H2 --> 2 Fe + 3 H2O 7.3 g of Fe2O3 is reacted with 15.3 g of hydrogen to form iron and water. How many moles of water are produced?Fe2O3 + 3 H2 –> 2 Fe + 3 H2OIf 9.1 g of Fe2O3 is reacted with 16.8 g of hydrogen to form iron and water. How many grams of iron are produced?
Answer:
0.14 moles of water are produced.
Explanation:
1st) From the balanced reaction we know that 1 mole of Fe2O3 reacts with 3 moles of H2 to produce 2 moles of Fe and 3 moles of H2O. Using the molar mass of Fe2O3 (160g/mol) and H2 (2g/mol) we can convert the moles to grams:
- Fe2O3 conversion: it is not necessary to calculate the conversion, because 1 mole is equal to 160g.
- H2 conversion:
[tex]3moles*\frac{2g}{1mole}=6g[/tex]So, from the balanced reaction, 160g of Fe2O3 react with 6g oh H2.
2nd) Now we have to find out which compound is the limiting reactant and which compound is the excess reactant, using the 7.3g and 15.3g from the exercise:
[tex]\begin{gathered} 160gFe_2O_3-6gH_2 \\ 7.3gFe_2O_3-x=\frac{7.3gFe_2O_3*6gH_2}{160gFe_2O_3} \\ x=0.27gH_2 \end{gathered}[/tex]Now we know that the 7.3g of Fe2O3 will need 0.27g of H2 to react properly, but in this case we have 15.3g of H2, so H2 is the excess reactant and Fe2O3 is the limiting reactant.
3rd) Finally, we can calulate the moles of water that are produced using the grams of the limiting reactant:
[tex]\begin{gathered} 160gFe_2O_3-3molesH_2O \\ 7.3gFe_2O_3-x=\frac{7.3gFe_2O_3*3molesH_2O}{160gFe_2O_3} \\ x=0.14molesH_2O \end{gathered}[/tex]So, 0.14 moles of water are produced.
Which quantum state (n,ℓ,mℓ) is NOT possible? and why
2,0,0
3,1,-1
3,0,1
3,2,2
16,14,15
The quantum numbers that are not possible are 16,14,15.
What are quantum numbers?The quantum numbers are used to address the position of the electron in an atom. They are the set of numbers that show the most probable position of the electron in an atom. There are four sets of quantum numbers that describe the position of an electron and they are;
1) Principal quantum number
2) Orbital quantum number
3) Magnetic quantum number
4) Spin quantum number.
The set of quantum numbers 16,14,15 is not possible because ml must have values of -l to +l as we know.
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NaCl + _Cal2 → Nal + CaCI2
Answer
2NaCl + Cal₂ → 2Nal + CaCI₂
Explanation
Given unbalanced equation;
NaCl + _Cal₂ → Nal + CaCI₂
Step 1: Balance the Cl atom on both the reactant and product sides of the equation by putting 2 as the coefficient of NaCl in the reactant side.
2NaCl + _Cal₂ → Nal + CaCI₂
Step 2: Balance the Na atom on both the reactant and product sides of the equation by putting 2 as the coefficient of NaI in the product side.
2NaCl + Cal₂ → 2Nal + CaCI₂
Therefore, the balanced equation is: 2NaCl + Cal₂ → 2Nal + CaCI₂
What a balanced chemical equation for the single displacement reaction you observed in Experiment 3. Include physical states.
In an experiment 25 grams of chloroform and 25 grams of chlorine were mixed. Which is the limiting reagent? I picked C but I’m not sure if I’m correct
In this question, we have to find the limiting reactant based on the following reaction:
CHCl3 + Cl2 -> CCl4 + HCl
We have:
25 grams of CHCl3
25 grams of Cl2
The molar ratio between these two compounds is 1:1, 1 mol of CHCl3 for 1 mol of Cl2
Now we have to find the number of moles of each reactant, let's start with CHCl3, we will use its molar mass, 119.38g/mol:
119.38g = 1 mol
25g = x moles
119.38x = 25
x = 25/119.38
x = 0.209 moles of CHCl3
According to the molar ratio, if we have 0.209 moles of CHCl3, we will also have 0.209 moles of Cl2, which has a molar mass of 70.9g/mol
Let's find the mass of 0.209 moles of Cl2:
70.9g = 1 mol
x grams = 0.209 moles of Cl2
x = 14.81 grams
We only need 14.81 grams of Cl2 to react with 25 grams of CHCl3, since we have more Cl2 than we actually need, this makes Cl2 the excess reactant, and CHCl3 will be the limiting reactant. Letter C
Where did you observe thermal energy in the circuit?
Thermal energy in a circuit comes from the electrical energy that is transformed into heat. It is observed in resistors, capacitances and inductances.
The electrical energy in a circuit is converted into heat by the thermal energy. It relies on the sort of circuit under evaluation, which in turn depends on the circuit's components. These elements include resistors, capacitances, and inductances—individually or in combination.
The sum of the squares of the current, resistance, and power dissipated. The impedance of the circuit must be computed for an LCR circuit. then utilizing the impedance, the circuit's current may be estimated.
P=V^2/R
Hence, the thermal energy in a circuit is observed in resistors, capacitances and inductances.
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a graduated cylinder has a mass of 50 g when empty. When 30 mL of water is added the graduated cylinder has a mass of 120 g. If a rock is added to the graduated cylinder, the water level rises to 75 mL and the total mass is now 250 g. What is the dentisy of the rock?
The density of the solid object is obtained to be 2.89 g/mL.
What is density?The density is defined as the ratio of the mass to the volume of the object. In this case, the density is to be obtained by the use of the displacement method of the solving the problem.
Mass of the empty cylinder = 50 g
Mass of water and cylinder = 120 g
Mass of water alone = 70 g
Mass of water, cylinder and the object = 250 g
Mass of the object = 250 g - 120 g = 130 g
Volume of the object = 75 mL - 30 mL = 45 mL
Density of the object = 130 g/45 mL
= 2.89 g/mL
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April investigated a crime scene where a gunshot sent blood through the air and it splattered on the wall. How would a forensic scientist BEST categorize this blood stain?
A.
transfer
B.
impact
C.
circular
D.
passive
The forensic scientist best categorize this blood stain by impact. Thus option B is correct.
What is forensic science?Forensic science is defined as the application of science to criminal and civil laws, with a focus on the criminal side during a criminal investigation as defined by the legal requirements of admissible evidence and criminal procedure.
There are various laws and principles of forensic science.
The laws of individuality and progressive change.Lockard's Exchange PrinciplePrinciple of Comparison: This law is crucial for laboratory investigations.Analytical Principle.The law of probabilityCircumstantial facts lawThus, the forensic scientist best categorize this blood stain by impact. Thus option B is correct.
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Where are the alkali metals and the alkaline earth metals located? How do the characteristic properties of each group compare/contrast to the other?
Alkali Metals are located in the first group in the periodic table. (Hydrogen is not alkali, be careful with that).
Alkaline Earth Metals are in group number two, right next to the Alkali Metals.
You have to look at the vertical groups ( 1 and 2).
----------------------------------------------------------------------------------------------------------------
ALKALI METALS (AL) VS ALKALINE EARTH METALS (ALE).
Alkali Metals are soft, Alkaline Earth Metals are hard.
AL have only one electron in the last shell, ALE have 2.
AL present a low melting point, ALE high.
AL form hydroxides strongly basic, ALE hydroxides are less basic.
AL are more reactive than ALE
AL have +1 ionic charge in their compounds, ALE have +2 ionic charge in their compounds.
17) Which atom has a higher electronegativity, Be or O?
The total number of calcium atoms in the expression 3 cal 2 shown in the equation 3CaCl 2 +2Na 3 PO 4 Ca(PO 4 ) 2 +6 NaCl is:
Let's write the balanced chemical equation:
[tex]3CaCl_2+2Na_3PO_4\to Ca_3(PO_4)_2+6NaCl.[/tex]You can see that in the reactants and in the products we have the same number of atoms for each element. This is due to the matter of conservation law.
The total number of calcium atoms that are reacting and produced in the reaction is 3.
What is the relationship between n, ℓ, and the total number of nodes?
The number of planar nodes = ℓ.
The number of spherical nodes = n - ℓ - 1.
The relationship between n, ℓ, and the total number of nodes is given by the expression; Number of spherical nodes = n - ℓ - 1.
What is the number of nodes?The number of nodes has to do with the points on the orbital where there is a zero electron density. It is the points along the orbital where there re no electrons. Recall that the orbitals are the regions in space where there is a high probability of finding an electron.
There are various orbitals and the number of nodes of each of the orbitals does vary. The s orbital has no nodes while the p orbital is known to have one node.
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The pH of an aqueous solution at 25°C was found to be 7.80.
The pOH of this solution is
The hydronium ion concentration is
M.
The hydroxide ion concentration is
M.
The pOH of this solution is 6.2 as pH is 7.80, The hydronium ion concentration is 1.58*10^-8 M, The hydroxide ion concentration is 6.3*10^-7 M
What is pH?
pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per litre, into numbers between 0 and 14. The hydrogen ion concentration in pure water, which has a pH of 7, is 107 gram-equivalents per litre, making it neutral (neither acidic nor alkaline). A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.
pKw = pH + pOH
14 = 7.80+ pOH
pOH = 14 -7.80 = 6.2
pH = - log [H+]
[H+] = 1.58*10^-8 M
pOH = - log [OH-]
[OH-] = 6.3*10^-7 M
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