The answer is .747
What are significant figures?There are 5 main rules to determining what are and what are not significant figures.
All non-zero digits are significant.If a decimal point is expressed, all zeros following non-zero digits are significant.If a decimal point is not explicitly expressed, zeros following the last non-zero digit are not significant.If a zero is bounded by non-zero digits, the zero is significant.Zeros preceding the first non-zero digit are not significant, they are placeholders only.NOTE: In any measurement, the last digit is always assumed to be estimated.
How do I divide/multiply with significant figures?The number of significant figures retained may not exceed the least number of digits in either of the factors. There will always be the same number of significant figures in the answer as the factor with the least amount of digits.
How do I apply that to this problem?Given:
[tex]9.635 /12.9 =?[/tex]
In the given problem, the number with the least amount of digits is 12.9. As we recall from above, all non-zero numbers are significant, therefore all of these numbers are significant. Hence, we should have 3 significant figures in our final answer.
Now we use a calculator to simply calculate the above and we obtain:
[tex]0.7468992248[/tex]
We want to have 3 significant figures, so we will take the first 3 significant figures in that answer, .746, and use that. We apply rounding properties and obtain our final answer of .747.
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How many moles of KF would need to be added to 2500 ml of water to make 1.2 M solution?
The number of moles of KF needed to prepare the solution is 3 moles
What is molarity?Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of KF Volume = 2500 mL = 2500 / 1000 = 2.5 L Molarity = 1.2 MMole of KF =?Molarity = mole / Volume
1.2 = mole of KF / 2.5
Cross multiply
Mole of KF = 1.2 × 2.5
Mole of KF = 3 moles
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A mineral sample has a mass of 75 g. When the sample is dropped
into a graduated cylinder with a volume of 20mL, the volume of the
graduated cylinder rises to 40 mL. What is the density of the
sample?
Answer:
3.75 g/mL
Explanation:
Density can be calculated using the following formula:
Density = mass (g) / volume (mL)
You have been given the mass of the mineral sample (75 g). To find the volume, you need to determine the amount of space that the sample takes up when it is placed in the water. This can be done by subtracting the initial water volume from the final water volume.
Volume = Final - Initial
Volume = 40 mL - 20 mL
Volume = 20 mL
Now, you can calculate the density of the mineral sample.
Density = mass / volume
Density = 75 g / 20 mL
Density = 3.75 g/mL
Answer:
Explanation:
Givens
The volume is the tricky part of this question. You are using the graduated cylinder to measure volume. The rise in the reading of the graduated cylinder = the volume of the sample.
Volume = 40 mL - 20 mL = 20 mL
Mass = 75 grams
Formula
Density = mass / volume
Solution
Density = 75 / 20 = 3.75
Answer
Density = 3.75
Please answer this question...
(The question is the attached pic)
Answer: D
Explanation:
When it is an acid, phenolphthalein will be colorless and litmus red.When it is neutral, phenolphthalein will be colorless and litmus will be blue.When it is basic, phenolphthalein will be pink and litmus blue.Determine which of the following statements is true.
A. Larger ionic charges in a compound create stronger bonds and higher melting points.
B. Giant covalent structures have low melting and boiling points.
C. lonic bonds are weak and break easily.
D. Giant covalent structures are brittle and shatter when hit
Giant covalent structures are brittle and shatter when hit this statement is true.
Hence, Option D is correct answer.
What is Ionic Bond ?Ionic bonds is a chemical bond formed when one atom transfer its valence electron to another atom. Ionic bond is also called electrovalent bond. These bonds are stronger.
What is Giant Covalent structure ?The 3-D structure of atom which are joined by covalent bond is called giant covalent structure. Giant covalent substances are brittle and they shatter when hit because covalent bond break at once. Giant covalent structure have very high melting and boiling point.
What is Ionic charges ?A larger ionic charges in a compound makes a weaker ionic bond. The larger ions have high melting point.
Thus from the above conclusion we can say that Giant covalent structures are brittle and shatter when hit this statement is true.
Hence, Option D is correct answer.
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A gas mixture (40% CH4, 40% CO, and 20% H2) are burned with 300% excess air where the gas and air
entering the combustion chamber at 25 C. What is the theoretical flame temperature achieved in C
Polysaccharides are healthier for the body than mono- or disacxharides are. What choices could you make to increase your consumption of polysaccharides and decrease your consumption of mono- and disaccharides?
Polysaccharides are healthier for the body than mono- or disaccharides are as glucagon is a type of polysaccharide found in animal tissues and is usually found in small amounts in meat from poultry and diet.
What do you need for both monosaccharides and polysaccharides?The Importance of Monosaccharides and Polysaccharides Both are essential as the primary food and dietary energy sources for all living organisms. Cell-wall polysaccharides make up the fibers that humans eat, and monosaccharides add sweetness to food.
Glycogen – This is a type of polysaccharide found in animal tissues and is usually found in small amounts in meat from poultry and diet. Most of the glycogen is stored in the liver, not in the muscles unless you eat a lot of liver and meat, so I said it was a small amount. In general, you may not be consuming too much glycogen. Starch (amylose and amylopectin) – It is found primarily in plants and is composed of two structurally distinct polysaccharides called amylose and amylopectin. Amylose is a linear polysaccharide, but amylopectin has many branched chains. Fiber-This is primarily cellulose, also a linear polysaccharide, a major structural component of plant cell walls. Humans cannot digest this carbohydrate because they lack the digestive enzymes needed to digest it.Read more about carbohydrates:
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Tin(IV) sulfide, SnS2, a yellow pigment, can be produced using the following reaction.
SnBr4(aq)+2Na2S(aq)⟶4NaBr(aq)+SnS2(s)
Suppose a student adds 48.1 mL of a 0.478 M solution of SnBr4 to 48.8 mL of a 0.160 M solution of Na2S.
The theoretical yield of [tex]SnS_2[/tex] will be 4.20 grams while the percent yield will be 7.93%
How is yield calculated?From the equation of the reaction, the mole ratio of [tex]SnBr_4[/tex] to [tex]Na_2S[/tex] is 1:2.
Mole of 48.1 mL, 0.478 M [tex]SnBr_4[/tex] = 0.478 x 48.1/100 = 0.023 mols
Mole of 48.8 mL, 0.160 M [tex]Na_2S[/tex] = 0.160 x 48.8/1000 = 0.0078 moles
[tex]SnBr_4[/tex][tex]Na_2S[/tex] is the limiting reactant.
Mole ratio of [tex]SnBr_4[/tex] and [tex]SnS_2[/tex] = 1:1
Equivalent mole of [tex]SnS_2[/tex] = 0.023 moles
Mass of 0.023 noles [tex]SnS_2[/tex]= 0.023 x 182.81 = 4.20 grams
With 0.0333 g of [tex]SnS_2[/tex] recovered, percent yield = 0.333/4.2 x 100 = 7.93%
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Tin(IV) sulfide, SnS2, a yellow pigment, can be produced using the following reaction.
SnBr4(aq)+2Na2S(aq)⟶4NaBr(aq)+SnS2(s)
Suppose a student adds 48.1 mL of a 0.478 M solution of SnBr4 to 48.8 mL of a 0.160 M solution of Na2S.
1) Calculate the theoretical yield of SnS2. ;
2) The student recovers 0.333 g of SnS2. Calculate the percent yield of SnS2 that the student obtained.
PLEASE HELP!!!
What is the correct net ionic reaction for Pb(NO3)2(aq) +2NaI(aq) → PbI2(s) + 2NaNO3(aq)?
The net ionic equation of the reaction is:
Pb²⁺aq) + 2 I(aq) → PbI2(s) What is a net ionic ionic equation?A net ionic equation is an equation which shows only the ions that are involved in the formation of a product in the reaction as well as the product of the reaction alone. Spectator ions are omitted.
The net ionic equation of the reaction is given below:
Pb²⁺aq) + 2 I(aq) → PbI2(s)
In conclusion, a net ionic equation does not show spectator ions.
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Answer: B
Explanation:
13. Use mole ratios to identify the limiting reagent in the following reaction: 3.10 mol of sodium mixes with 4.17 mol of water to form sodium hydroxide and hydrogen gas.
14. Determine the number of excess moles of the excess reagent in the following reaction: 4.80 mol of calcium mixing with 3.55 mol of oxygen gas, making calcium oxide.
13) The limiting reagent is water.
14) Oxyge is in excess by 1.15 mol
Limiting reagent13) According to the equation of the reaction:
[tex]2Na + 2H_2O --- > 2NaOH + H_2[/tex]
The mole ratio of the reactants is 1:1.
But 3.10 mol of sodium and 4.17 mol of water were reacted. Thus, water is in excess while sodium is limiting.
14) [tex]2Ca + O_2 --- > 2CaO[/tex]
Mole ratio of reactants = 2:1
4.80 mol Ca and 3.55 mol oxygen were reacted. Thus, oxygen is in excess.
Excess oxygen = 3.55 - 4.80/2 = 1.15 mol
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What mass of carbon dioxide is produced by the complete combustion of 48.0 g of hexane?
The mass of carbon dioxide produced by the complete combustion of 48.0g of hexane is 147.35g.
How to calculate mass?The mass of a substance can be calculated by using the stoichiometry approach.
The balanced equation of the complete combustion of hexane is as follows:
2C6H14(g) + 19O2(g) → 12CO2(g) + 14H2O(g)
48g of hexane to moles is calculated as:
48g ÷ 86g/mol = 0.56 mol
2 moles of hexane produces 12 moles of CO2
0.56 mol of hexane will produce 0.56 × 12/2 = 3.35 mol
Next, we convert 3.35 moles of CO2 to mass as follows:
3.35 moles × 44g/mol = 147.35g
Therefore, the mass of carbon dioxide produced by the complete combustion of 48.0g of hexane is 147.35g.
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10.30 Indicate whether each of the following solutions is acidic,
basic, or neutral:
a. [H3O+] = 6.0 × 10-12 M
Answer:
Basic
Explanation:
The pH scale is measured from 0 to 14.
At the pH scale of 7, a solution is neutral.
Any solution above 7 is basic.
Any solution below 7 is acidic.
Because you have been given the hydronium concentration [H₃O⁺], you can find the pH of the solution using the following formula:
pH = -log[H₃O⁺]
pH = -log(6.0 x 10⁻¹²)
pH = 11.22
As you can see, the solution must be basic because the pH lies within the basic range.
4. Which conditions of P, T, and n, respectively, are most ideal?
A) high P, high T, high n
B) low P, low T, low n
C) high P, low T, high n
D) low P, high T, high n
E) low P, high T, low n
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, the correct option is option D that is low P, high T, high n. Ideal gas is a hypothetical gas.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Vanderwaal gas can behave as ideal gas at low pressure and high temperature.
Mathematically, the ideal gas equation can be written as
PV=nRT
where, the symbols have the following meaning
P = pressure of ideal gas
V= volume of ideal gas
n =number of moles of ideal gas
T =temperature of ideal gas
R = Gas constant = 0.0821 L.atm/K.mol
The conditions of P, T, and n that are most ideal are low P, high T, high n.
Therefore, the correct option is option D that is low P, high T, high n.
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Choose two answers
Why does the oil in this soup gather into drops instead of dissolving evenly throughout the surface of the water
Oil drops do not spread across hot water because the surface tension of hot water is lower than that of oil. The water molecules cannot share intermolecular forces with the oil molecules. Thus the correct option is C.
Oil has a higher surface tension than hot soup. It prevents an oil drop from spreading over the heated soup. The surface tension of oil is lower than that of soup when the soup's temperature drops. As a result, the oil drop begins to spread across the soup.
The cohesive force between oil molecules is less than the adhesive force between oil and water molecules. As a result, water molecules and oil molecules do not mix.
Thus the correct option is C.
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Identify the oxidizing and reducing agents in the following: H2S(aq) + Cl2(g) -> S(s) + 2HCI (aq)
The oxidizing and reducing agent in the above redox reaction are hydrogen sulphide (H2S) and Chlorine (Cl) respectively.
What is an oxidizing and reducing agent?An oxidizing agent is any substance that oxidizes, or receives electrons from another substance and as a result, becoming reduced.
On the other hand, a reducing agent is any substance that reduces or donates electrons to another and as a result becomes oxidized.
According to this reaction; H2S(aq) + Cl2(g) -> S(s) + 2HCI (aq)
H2S accepts electrons from Cl2 and becomes reduced to SCl2 donates electrons to H2S and becomes oxidized to HClTherefore, the oxidizing and reducing agent in the above redox reaction are hydrogen sulphide (H2S) and Chlorine (Cl) respectively.
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10. Suppose that 20.0 mL of 5.00 x 10-3 M aqueous sodium hydroxide (NaOH) is required to neutralize 10.0
mL of an aqueous solution of hydrochloric acid (HCI). Using the balanced chemical equation below,
find the molarity of the HCI solution?
NaOH (aq) + HCI (aq) → H₂O (1) + NaCl (aq)
A. 1.00 x 103 M HCI
B. 1.00 x 102 M HCI
C. 5.00 x 103 M HCI
D. 5.00 x 10-2 MHCI
Explanation:
B. 1.00 x 10^-2 M HCI
The question is asking us to find the molarity/concentration of the acid (HCl).
We have been provided with;
20.0 mL of 5.0 x 10^-³ M NaOH10.0 mL of HClWe know that molarity (M) of a solution is contained in 1 L or 1000 mL or 1000 cm³.
This means that;
5.0 x 10^-³ moles is contained in 1000 mL.
is contained in 1000 mL.X mol is contained in 20.0 mL
[tex]x \: mol \: = \frac{20 \times 5.0 \times {10}^{ - 3} }{1000} \\ = 0.0001 \: mol[/tex]
= 0.0001 moles
These 0.0001 moles is contained in 10 mL of HCl.
To find the molarity of the acid;
0.0001 moles is contained in 10 mL
x mol is contained in 1000 mL
[tex]x \: mol \: = \frac{0.0001 \times 1000}{10} \\ = 0.01 \: mol[/tex]
= 0.01 M
Therefore the Concentration of the acid (HCl) is 0.01 M or 1.0 x 10^-2 M
WHATS THE CORRECT ANSWER ANSWER ASAP FOR BRAINLIST
Answer:
Falling water!Explanation:
Hope this helps
Anna stated that ionic compounds have high melting points and low boiling points. She said that this demonstrates that ionic compounds have strong bonds because a lot of energy is needed to break the electrical forces that hold the bonds together.
Which statement best describes Anna’s error?
Strong electrical forces will make ionic compounds have high boiling points.
Strong electrical forces will make ionic compounds have weak bonds.
A low amount of energy is needed to break the bonds in ionic compounds.
Gravitational forces hold the bonds together in ionic compounds.
The statement which best describes Anna’s error is: A. strong electrical forces will make ionic compounds have high boiling points.
The type of chemical bonds.In Chemistry, there are different types of chemical bonds and these include the following:
Metallic bondsHydrogen bondsCovalent bondsIonic bondsAn ionic bond is typically characterized by electrostatic attraction that is formed between oppositely charged ions or atoms of chemical elements with different electronegativities.
In conclusion, Anna was wrong to posit that strong electrical forces makes all ionic compounds to have high boiling points.
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Answer:
✔Strong electrical forces will make ionic compounds have high boiling points.
❌Strong electrical forces will make ionic compounds have weak bonds.
❌A low amount of energy is needed to break the bonds in ionic compounds.
❌Gravitational forces hold the bonds together in ionic compounds.
Explanation:
When 5ml of 30% H2O2 is decomposed into water and oxygen, how many grams of oxygen and how many grams of water are left?
The mas of the products are given below:
mass of oxygen produced = 0.7056 g of oxygenmass of water produced = 0.794 g of hydrogenHow many moles are there in 5 ml of 30% of hydrogen peroxide?The moles of hydrogen peroxide in 5 ml of 30% of hydrogen peroxide is calculated using the formula:
Moles = concentration * volume
Molarity of 30% of hydrogen peroxide = 8.82 mol/L
Moles = 8.82 * 5/1000 = 0.0441 moles
The equation of the the decomposition of hydrogen peroxide is given as:
2 H₂O₂ -----> 2 H₂O + O₂
Based on the mole ratio;
mass of oxygen produced = 0.0441/2 * 32 g = 0.7056 g of oxygen
mass of water produced = 0.0441 * 18 g = 0.794 g of hydrogen
Therefore, the mass of the products of the decomposition of hydrogen peroxide is determined from the mole ratio of the reaction.
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the element with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d5 is
Answer:
Mn
Explanation:
Looks like Mn ( Manganese) from the Periodic Table of elements)
there are 25 electrons......25 protons ....atomic number 25 = Mn
73 m is equal to how many dm?
According to the article, puberty indicates the beginning of adolescence. How does nutrition influence the start of adolescence?
Answer:
adolescence begins according to your dietExplanation unhealthy diet brings about early or late commence of adolescence especially in girls
Consider 4.00 L of a gas at 365 mmHg and 20. ∘C . If the container is compressed to 2.80 L and the temperature is increased to 30. ∘C , what is the new pressure, P2 , inside the container? Assume no change in the amount of gas inside the cylinder.
This is an exercise in the General Combined Gas Law.
To start solving this exercise, we obtain the following data:
Data:V₁ = 4.00 lP₁ = 365 mmHgT₁ = 20 °C + 273 = 293 KV₂ = 2,80 lT₂ = 30 °C + 273 = 303 KP₂ = ¿?We apply the following formula:
P₁V₁T₂=P₂V₂T₁ ⇒ General formulaWhere:
P₁=Initial pressureV₁=Initial volumeT₂=end temperatureP₂=end pressureT₂=end temperatureV₁=Initial temperatureWe clear for final pressure (P2)
[tex]\large\displaystyle\text{$\begin{gathered}\sf P_{2}=\frac{P_{1}V_{1}T_{2}}{V_{2}T_{1}} \ \ \to \ \ \ Formula \end{gathered}$}[/tex]
We substitute our data into the formula:
[tex]\large\displaystyle\text{$\begin{gathered}\sf P_{2}=\frac{(365 \ mmHg)(4.00 \not{l})(303 \not{K})}{(2.80 \not{l})(293\not{K})} \end{gathered}$}[/tex]
[tex]\large\displaystyle\text{$\begin{gathered}\sf P_{2}=\frac{442380 \ mmHg}{ 820.4 } \end{gathered}$}[/tex]
[tex]\boxed{\large\displaystyle\text{$\begin{gathered}\sf P_{2}=539.224 \ mmHg \end{gathered}$}}[/tex]
Answer: The new canister pressure is 539.224 mmHg.
{ Pisces04 }How many moles of S2O8 2– react for every mole of S2O3 2– that reacts? Consider the balanced chemical equations for reactions 1 and 2 to calculate the change in concentration of S2O8 2– , [S2O8 2– ], in this trial. (0.5 pts)
For 1 mole of S₂O₃²⁻ 0.5 mole of S₂O₈²⁻ will be used.
What is a balanced Reaction ?A reaction in which the number of atoms in reactants is equal to the number of atoms in the products is called a balanced reaction.
The reaction given in the question is
S₂O₈²⁻ + 2I⁻ ⇄ 2SO₄²⁻ + I₂
I₂ + 2S₂O₃²⁻ ⇄ 2I⁻ + S₄O₆²⁻
Adding the equation will give balance equation
S₂O₈²⁻ + 2I⁻ + 2S₂O₃²⁻ ⇄ 2SO₄²⁻ + 2I⁻ + S₄O₆²⁻
So x moles of S₂O₈²⁻ require 2x of S₂O₃²⁻
for 1 mole of S₂O₃²⁻ 0.5 mole of S₂O₈²⁻ will be used.
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Hi, I am trying to calculate the dosage of mg i should be taking per night. I am 135 pounds 5’7.
I choose the lower limit 0.024 mg/kg/day
1 pound = 0.453592 kg
135 pounds = 61.235 kg
dosage/day = 0.024 x 61.235 = 1.47 mg
Answer:
See below
Explanation:
I will use the approximate AVERAGE
of the dosage range ~ .20 mg/kg/week
135 pounds = 61.23 kg
Now , for SEVEN days/week dosing:
61.23 kg * .20 mg/kg-wk / 7 days/week = 1.75 mg/day
Write the formula for methionine (red = O , gray = C , blue = N , yellow = S , ivory = H ).
Express your answer as a molecular formula. Enter the elements in the order: C , H , N , O , S .
Answer:
The molecular formula of methionine is C₅H₁₁NO₂S
WHATS THE CORRECT ANSWER ANSWER ASAP
Solar energy is a non-pollutant, which means it doesn't pollute the environment. so therefore A is the correct answer.
It requires 334 kJ of heat to melt 1 kg of ice. The largest known iceberg had a volume of about 3.1 x 10^13 m³. How much heat was required
to melt the iceberg if 1 m³ of ice has a mass of 917 kg?
Answer:
3.1×10^13×917= 2842.7×10^13 kg
2842.7×10^13×334=949,461.8×10^13 KJ
Explanation:
First off you convert m³ to kg then convert Kg to Kj
The amount of heat required to melt the iceberg is [tex]9.58 * 10^{18}kJ[/tex]
Latent heat of fusion is the amount of heat required to melt an unit mass of ice.
Mass of iceberg is [tex]3.1*10^{13} m^{3} *917Kg =2.8427*10^{16} Kg[/tex]
Amount of heat required is calculated as:
[tex]2.8427* 10^{16} * 334 =9.58* 10^{18}kJ[/tex]
Hence, the amount of heat required to melt the iceberg is [tex]9.58*10^{18}kJ[/tex]
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The pH of acid solution are given below Choose the weakly and solution a. 12.b 6 c
9
Answer:
Explanation:
If you are looking for a weak acid then answer should be b. 6
pH scale goes from 0-14. 0-6 being acid, 7 being neutral, 8-14 being base.
Strong acids are typically low pH like 0-1, since 6 is not in that range it is weak acid.
Option A and C describe base since they are above 7.
Which statement is false for the balanced equation given below? (Atomic weights: N = 14.01, H = 1.008, O = 16.00). Explain your answer. 4 NH3 + 5 O2 → 4 NO + 6 H₂O a) The reaction of 4 molecules of NH3 requires 5 molecules 02 b) The reaction of one mole of NH3 requires 40 g of O2 c) The reaction of 4 moles of NH3 produces 30 g of NO d) The reaction of 17 glof NH3 will produce 27 g of water e) The reaction of 10 molecules of NH3 produces 15 molecules of H₂O
The false statement is that the reaction of 17 g of NH3 will produce 27 g of water. (Option D)
What is a balanced reaction equation?A balanced reaction equation is one in which the number of atoms of each element on the right hand side of the equation is equal to the number of atoms of the same element on the left and side of the reaction equation.
The equation of the reaction is 4 NH3 + 5 O2 → 4 NO + 6 H₂O. The number of atoms of each element on both sides are equal.
Hence, the statement that is false from the reaction equation is; "the reaction of 17 g of NH3 will produce 27 g of water".
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why bonding of water molecule called a pure
Answer:
A molecule of water has two hydrogen atoms. Both of these atoms can form a hydrogen bond with oxygen atoms of different water molecules. Every water molecule can be hydrogen bonded with up to three other water molecules