Answers
There are 25 marbles in a box and 9 of the marbles are blue. What percent of the marbles are a color other than blue.
First, we need to understand what the problem is asking us to do. If we know that there are 9 marbles in the box that are blue and there are 25 marbles that are in the box altogether, we can subtract 9 from 25 and we get a difference of 16. Now we know that we need to find the percent of the marbles that are not blue.
16 ÷ 25 = 0.64
0.64 × 100 = 64%
Therefore, 64% of the marbles are a different color than blue and 36% of the marbles are blue.
Related Questions
When does a scientists create the conclusion
Answers
When 8 moles of lithium metal react with excess oxygen gas, how many moles of lithium oxide can be produced? 4Li + 2O2 → 2Li2O
Answers
4Li + 2O2 → 2Li2O
By using this balanced equation coefficients, 2 moles of Li make 1 mole of Li2O, ratio between Li and Li2O is 2:1
So, 4 moles of Li makes 2 mole of Li2O
And 8 moles of Li makes 4 mole of Li2O
It means When 8 moles of lithium metal react with excess oxygen gas, 4 moles of lithium oxide can be produced.
Calculate the number of moles of magnesium used in trial 1. the molar mass of magnesium is 24.305 g/mol.
Answers
Final answer:
To calculate the number of moles of magnesium, divide the mass of magnesium used in the trial by its molar mass of 24.305 g/mol. An example calculation for 24.305 grams of magnesium would yield exactly 1 mole of magnesium.
Explanation:
To calculate the number of moles of magnesium used in trial 1, you should use the molar mass of magnesium and the given mass of magnesium from the trial. If the mass of magnesium used in trial 1 was not provided in the question, it must be known to perform the calculation.
Here's how you can calculate it:
First, ascertain the mass of magnesium used in trial 1 (let's assume it is 'x' grams).
Then, use the molar mass of magnesium which is 24.305 g/mol.
Divide the mass of magnesium by its molar mass to find the number of moles: Number of moles = mass of magnesium (grams) / molar mass of magnesium (g/mol).
For example, if you used 24.305 grams of magnesium in trial 1, the calculation would be:
Number of moles = 24.305 g / 24.305 g/mol = 1 mol
Calculate the mass of 0.00456 moles of (NH4)2SO4
Answers
N = 14.007 g/mol
H = 1.008 g/mol
S = 32.065 g/mol
O = 16 g/mol
2(14.007) + 8(1.008) + 32.065 + 4(16) = 132.143 g/mol
Now you know how much an entire mol weight you multiply it by how much you actually have
0.00456 * 132.143 = 0.603 g
Mass of (NH4)2SO4 is 0.6025g
Finding the mass of a compoundUsing the equation:
Number of moles = Mass /Molar Mass
Given,
0.00456 as Number of moles of (NH4)2SO4
and Molar mass as
N = 14.007 g/mol=2(14.007)
H = 1.008 g/mol= 8(1.008)
S = 32.065 g/mol= 32.065
O = 16 g/mol= 4(16)
(NH4)2SO4 = 132.143 g/mol
Mass of (NH4)2SO4 = 132.143 g/mol x 0.00456=0.6025g
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24 what is the correct name for the compound cocl?
Answers
colbalt(III) chloride
The correct name for the compound CoCl is cobalt (III) chloride composed of cobalt and chlorine atoms.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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What are three physical properties often analyzed to identify covalent compounds?
Answers
In order to identify if a compound is covalent it must satisfy the following physical properties:
1. Covalent compounds generally have much lower melting and boiling points than ionic compounds.
2. Covalent compounds have soft or brittle solid forms.
3. Covalent compounds have poor electrical and thermal conductivity.
Covalent compounds can be identified by their low melting and boiling points, non-conductivity of electricity, and solubility in nonpolar solvents.
Explanation:Covalent compounds, also referred to as molecular compounds, are usually identified through several physical properties such as their low melting and boiling points, non-conductivity of electricity, and their solubility in nonpolar solvents.
Low melting and boiling points: Covalent compounds don't have strong intermolecular forces, resulting in low melting and boiling points.
Non-conductivity of electricity: Since most covalent compounds don't dissociate into ions in solutions, they typically do not conduct electricity.
Solubility in nonpolar solvents: Due to the 'like soluble like' rule, covalent compounds tend to be soluble in nonpolar solvents rather than polar solvents such as water.
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If 4.35 grams of zinc metal react with 35.8 grams of silver nitrate, how many grams of silver metal can be formed and how many grams of the excess reactant will be left over when the reaction is complete? Show all of your work. unbalanced equation: Zn + AgNO3 yields Zn(NO3)2 + Ag
Answers
Zn + 2AgNO3 = Zn(NO3)2 + 2Ag
To determine the grams of silver metal that is being produced, it is important to first determine which is the limiting reactant and the excess reactant from the given initial amounts. We do as follows:
4.35 g Zn ( 1 mol / 65.38 g ) ( 2 mol AgNO3 / 1 mol Zn ) = 0.1331 mol AgNO3 needed
35.8 g AgNO3 ( 1 mol / 169.87 g ) ( 1 mol Zn / 2 mol AgNO3 ) = 0.1054 mol Zn needed
Therefore, the limiting reactant would be the zinc metal since it would be consumed completely in the reaction. The excess amount of AgNO3 would be:
0.2107 mol AgNO3 - 0.1331 mol AgNO3 = 0.0776 mol AgNO3 left ( 169.87 g / 1 mol ) = 13.19 g AgNO3 left
0.0665 mol Zn ( 2 mol Ag / 1 mol Zn) ( 107.9 g / 1 mol) = 14.3581 g Ag produced
Which activity can occur without the use of energy?
Answers
HELP PLEASE. STRUGGLING. Which of the following is true in an acidic solution? A)The molarity of hydroxide is double the molarity of hydronium. B)The molarity of hydroxide is equal to the molarity of hydronium. C)The molarity of hydroxide is lower than the molarity of hydronium. D)The molarity of hydroxide is higher than the molarity of hydronium.
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If the concentrations of the OH- and H3O+ are the same then the solution would be neutral, and if the opposite is true. The concentration of OH- is more than H3O+ than the solution would be basic.
B) into the same funnel is poured carefully 50 ml of hexane (density = 0.660 g/ml) so that the other two layers are not disturbed. the hexane forms a third layer. the funnel is stoppered and the mixture is shaken vigorously. after standing, two layers separate. which compound(s) are in which layer?
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The molar mass of carbon dioxide is 44.0 g/mol. a mass of 150.0 grams of carbon dioxide is equivalent to how many moles?
A) 3.00 mol
B) 3.41 mol
C) 29.3 mol
D) 106 mol
Answers
m(CO₂)=150.0 g
n(CO₂)=m(CO₂)/M(CO₂)
n(CO₂)=150.0/44.0=3.41 mol
B) 3.41 mol
The molar mass of carbon dioxide is 44.0 g/mol. a mass of 150.0 grams of carbon dioxide is equivalent to 3.41 mol of carbon dioxide.
What is mole?In the International System of Units, the mole is the unit of substance quantity (SI). How so many elementary units of a certain substance are present in an item or sample is determined by the quantity of that material. There are precisely 6.022×10²³ elementary entities in a mole.
For instance, although having differing volumes and weights, 10 moles containing water along with ten moles of mercury both contain the same quantity of material, and the mercury includes exactly 1 atom for every molecule of water.
M(CO₂)=44.0 g/mol
m(CO₂)=150.0 g
n(CO₂)=m(CO₂)/M(CO₂)
n(CO₂)=150.0/44.0=3.41 mol
Therefore, 3.41 mol of carbon dioxide is there.
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How many grams of h3po4 are in 521 ml of a 9.30 m solution of h3po4?
Answers
Final answer:
To find the mass of H3PO4 in 521 ml of a 9.30 M solution, convert the volume to liters, multiply by the molarity to get moles, and then convert moles to grams using the molar mass of H3PO4. Approximately 474.6434 grams of H3PO4 are in 521 ml of a 9.30 M solution.
Explanation:
The student has asked how many grams of H3PO4 are in 521 ml of a 9.30 M solution. To find this, we use the formula:
Calculate the number of moles of H3PO4 by multiplying the molarity (M) of the solution by the volume of the solution in liters.
Convert the moles of H3PO4 to grams using the molar mass of H3PO4 (which is approximately 98 g/mol).
First, we convert 521 ml to liters (521 ml * 0.001 L/ml = 0.521 L). Next, we calculate the moles of H3PO4 (9.30 M * 0.521 L = 4.8433 mol). Finally, we multiply the number of moles by the molar mass of H3PO4 to get the mass in grams (4.8433 mol * 98 g/mol = 474.6434 g).
Therefore, there are approximately 474.6434 grams of H3PO4 in 521 ml of a 9.30 M solution.
of the following, ____ has the lowest boiling point
cl2
o2
n2
h2
Answers
Benzene and its derivatives undergo a type of substitution reaction in which a hydrogen atom is replaced by a substituent, but the stable aromatic benzene ring is regenerated at the end of the mechanism.
Answers
Which characteristics apply to the gaseous state? i. low density ii. high density iii. rapid molecular motion iv. slow molecular motion v. large distance between particles?
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2 Rapid molecular motion
3 Large distance between particles
The characteristics applicable to gaseous state are low density, rapid molecular motion and large distance between particles.
What are the characteristics of gaseous state?Substances in gaseous state are easy to compress as they have large inter- molecular distances.They also have the unique property of expansion owing to which large amounts of gases can fit into small volumes.
As gases occupy large volumes as compared to their masses they have low density.Owing to their large inter-molecular spaces they have more degree of freedom due to which there is rapid molecular motion.
The kinetic energy possessed by gas molecules is highest in gases due to large spaces present between the molecules.They have high thermal energy as molecules are far apart and heat causes molecules to move faster.
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What is the ph of a 2.7 m solution of hclo4?
Answers
pH = -log[H+]
Substituting,
pH = -log[2] = -0.3
So the pH of the solution is going to be -0.3.
The concentration of H+ ions in the solution of 2.7 molar HClO₄ is 2.7 molar. Thus the pH of the acid is -0.43.
What is PH?pH of a solution is the measure of its H+ ions concentration. It determines how much acidic or basic the solution is. Mathematically it is the negative logarithm of H+ ion concentration.
A pH of 7 indicates that the solution is neutral and a pH below 7 is acidic and pH of above 7 is for basic solution. Thus strong acids such as chloric acid HClO₄ , have a pH very less. But it depends on the concentration of solute in the solution.
Given that the molarity of the acid is 2.7 molar. It furnish equal number of moles H+ ions and anions. Thus the concentration of H+ ion is 2.7 M.Now the pH is calculated as follows:
pH = -log [H+]
= -log (2.7)
= -0.43
Hence, the pH of the solution is -0.43.
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A scientist observes several metals and records the followinv data.which of the data sets represents qualitative data?A The máss of the metals B The volume de the metal C the softness de the metal D the color of the metals
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Which separation method would be most successful in separating the components of a homogeneous mixture?
A) Screening
B) Evaporation
C) Centrifugation
D) Magnetic Separation
Answers
Answer: Option (B) is the correct answer.
Explanation:
When a liquid changes into vapors or gas then this process of change is known as evaporation.
A mixture in which solute particles completely dissolve in even composition throughout the solvent then it is known as homogeneous mixture.
For example, when salt is dissolved in water then upon heating it water can be evaporated and crystals of sodium chloride can be obtained.
Whereas screening method is used in the discovery of a drug and it a scientific experimentation method.
When particles of a mixture are separated by spinning then this process is known as centrifugation.
When a magnetic force is used to separate magnetic particles present in a mixture then this process is known as magnetic separation.
Thus, we can conclude that evaporation is the separation method would be most successful in separating the components of a homogeneous mixture.
Under conditions where ketone bodies are being produced in the liver, how many atps can be produced from a molecule of palmitic acid if all resulting molecules of acetyl-coa are converted into β-hydroxybutyrate
Answers
129 molecules of ATP is produced if all resulting molecules of acetyl-coa are converted into β-hydroxybutyrate.
What is Beta oxidation?This is a metabolic process involving multiple steps by which fatty acid molecules are broken down to produce energy.
Palmitic acid is a 16 carbon fatty acid and undergoes 7 beta-oxidation reactions which is shown below
7 NADH + 7 FADH2 + 8 acetyl-CoA
Acetyl-CoA being converted to acetoacetate with β-hydroxybutyrate being the reduced form.
The average ATP production is 131 minus 2 ATP which was used up for the initial activation of every fatty acid thereby bringing the amount to 129ATP.
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In carbon dioxide (CO2), there are two oxygen atoms for each carbon atom. Each oxygen atom forms a double bond with carbon, so the molecule is formed by two double bonds.Two double bonds means that the total number of electrons being shared in the molecule is
A) Two
B) Four
C) Six
D) Eight
Answers
Answer: Option (D) is the correct answer.
Explanation:
The atomic number of carbon is 6 and atomic number of oxygen is 8. Therefore, there are 4 valence electrons in carbon and there are 6 valence electrons in oxygen.
Each carbon and oxygen atom shares 4 electrons to form one double bond. It is known that a [tex]CO_{2}[/tex] molecule has 2 double bonds hence, there will be total sharing of 8 electrons.
Thus, we can conclude that two double bonds means that the total number of electrons being shared in the molecule is 8.
Answer:The correct answer is option D.
Explanation:
In carbon-dioxide molecule, there are two oxygen atoms and one carbon atom.
Sharing of two electrons between the atom give rise to single bond.
In single bond = 2 electrons
So, in a double bond = 2 × 2 = 4 electrons
There are two doubles bonds in the carbon-dioxide molecule, so the total number of the electrons ebbing shared in the molecule is =
=4 electrons × 2 = 8 electrons
Hence,the correct answer is option D.
How much dioxin is present in 2.6 l of this water? assume a density of 1.00 g/ml?
Answers
The amount of dioxin in the water cannot be calculated without knowing the concentration of dioxin. However, the mass of the water sample can be determined using the given volume and the density of water.
Explanation:To calculate the amount of dioxin in your water sample, you would first need to know the concentration of dioxin in the water. However, assuming a density of 1.00 g/ml, you can calculate the mass of your water sample as follows: Water sample volume is 2.6 L (or 2600 ml). Given the density of water is 1.00 g/ml, we can use the formula Density = Mass/Volume or rearranged to Mass = Density x Volume to get: Mass = 1.00 g/ml x 2600 ml = 2600 g. So, the mass of the water is 2600 g. To get the amount of dioxin, we need the concentration of dioxin in the water (usually given in parts per million or ppm)
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Calcium’s atomic number is 20. it forms ions with 18 electrons. what is the electrical charge of a calcium ion?
Answers
Calcium, with an atomic number of 20, forms ions by losing 2 electrons, leaving it with 18 electrons and 20 protons. This gives it a net charge of +2.
Explanation:The electrical charge of a calcium ion can be determined by looking at its number of electrons compared to its atomic number. Calcium's atomic number is 20, meaning it has 20 protons and normally 20 electrons. However, the question states that it forms ions with 18 electrons, so it has lost 2 electrons to become a calcium ion.
When an atom loses electrons, it becomes positively charged. Since calcium has lost 2 electrons, its electrical charge is +2.
Therefore, the electrical charge of a calcium ion is +2.
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which element has atoms that can form single, double, and triple covalent bonds with others atoms of the same element
Answers
Which element has atoms that can form single, double, and triple covalent bonds with others atoms of the same element?
Carbon is the element that has atoms that can form single, double and triple covalent bonds.
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Solve an equilibrium problem (using an ice table) to calculate the ph of each solution: part a a solution that is 0.195 m in hc2h3o2 and 0.125 m in kc2h3o2
Answers
HC2H3OO = H+ + C2H3OO-
KC2H3OO = K+ + C2H3OO-
Therefore, the only source of hydrogen ion would be the acid. We use the ICE table,
HC2H3OO H+ C2H3OO-
I 0.195 0 0.125
C -x +x +x
------------------------------------------------------------------
E 0.195-x x 0.125 + x
Ka = 1.8*10^-5 = (0.125 + x) (x) / 0.195 -x
x = 2.81x10^-5 M = [H+]
pH = - log [H+]
pH = -log 2.81x10^-5
pH = 4.55
Therefore, the pH of the resulting solution would be 4.55.
To calculate the pH of the given solution, use an ICE table to determine the concentrations of HC2H3O2 and C2H3O2-. Substitute these concentrations into the Ka expression to calculate the Ka value. Finally, use the definition of pH to determine the pH of the solution.
Explanation:To calculate the pH of a solution that is 0.195 M in HC2H3O2 and 0.125 M in KC2H3O2, we can use an ICE table. First, we set up the ICE table to determine the concentrations of HC2H3O2 and C2H3O2- at equilibrium. Once we have these concentrations, we substitute them into the Ka expression to calculate the Ka value. Finally, we use the definition of pH to determine the pH of the solution.
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During hydrolysis, ___________ must be added before the bonds can be broken. (look at flash animation on hydrolysis)
Answers
The correct answer is water.
During hydrolysis, _____water______ must be added before the bonds can be broken.
For example, sucrose undergoes hydrolysis to break into glucose and fructose. Here sucrose is a disaccharide and glucose and fructose are monosaccharides.
Sucrose + H₂O → glucose + fructose
Esters are formed by the combination of carboxylic acid and alcohol.
But the hydrolysis of ester causes the release of carboxylic acid and alcohol.
RCOOR'(ester) + H₂O → RCOOH(carboxylic acid) + R'OH(alcohol)
Classify each salt as acidic, basic, or neutral. drag the appropriate items to their respective bins. hints hint 1. how to approach the problem(click to open) hint 2. identify the cations from weak bases(click to open) hint 3. identify the anions from weak acids(click to open) helpreset nh4clnaclokno3 neutral salts acidic salts basic salts
Answers
Answer:
[tex]NH_4Cl[/tex] -> Acidic
[tex]NaClO[/tex] -> Basic
[tex]KNO_3[/tex] -> Neutral
Explanation:
Hello,
In this case, considering the given salts, [tex]NH_4Cl[/tex], [tex]NaClO[/tex], [tex]KNO_3[/tex] one classifies them as follows:
- [tex]NH_4Cl[/tex]: ammonium chloride is an acidic salt since it comes from ammonium hydroxide which is a weak base and hydrochloric acid which a strong base, thus, due to the partial neutralization, there are still traces of an acidic character which provides such behavior for this salt.
- [tex]NaClO[/tex]: sodium hypochlorite is a basic salt since it comes from sodium hydroxide which is a strong base and hypochlorous acid which is a weak acid by means of the contrary behavior of the [tex]NH_4Cl[/tex] since traces of a basic character promote such basic behavior.
- [tex]KNO_3[/tex]: potassium nitrate is a neutral salt as long as it comes from the potassium hydroxide which is a strong base and the nitric acid which is a strong acid, promoting the complete neutralization.
Best regards.
NH4Cl, NaCl, and KNO3 are classified as acidic, neutral, and basic salts, respectively. This classification depends on their behavior when dissolved in water, resulting in either acidic, neutral, or basic solutions.
Explanation:Classification of Salts
In chemistry, salts such as NH4CL, NaCl, and KNO3 are all ionic compounds that can be classified as either acidic, basic, or neutral. This classification depends on their behavior when dissolved in water, in a process known as hydrolysis.
NH4Cl ionizes in water to yield NH4+ and Cl- ions. The NH4+ ions can act as an acid by donating a proton (H+) to water to generate hydronium ions (H3O+), leading to an acidic solution. Therefore, NH4Cl is an acidic salt.
In contrast, NaCl behaves differently. When it dissolves in water, it releases Na+ and Cl- ions. Neither of these ions reacts with water, making NaCl a neutral salt.
Finally, salts like KNO3, which produce a base and a neutral component upon dissolution, are considered basic salts because they make the solution slightly more alkaline.
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When looking at the percentage of patients whose symptoms were relieved after taking a placebo, a scientist sees a 20% success rate. The success rate of patients whose symptoms were relieved after taking a new composite drug was 30%. The scientist determines that the margin of error is 10%, which indicates that the new drug had no statistically significant positive effect. In which stage of the engineering process is this scientist?
A. Evaluating test results
B. Screening
C. Identifying a need
D. Looking for future improvements
Answers
Answer:
A. Evaluating test results
Explanation:
Took the class.
True or false if you refuse to submit a breath you’re in a blood test is an assumable for evidence in a DUI criminal proceedings in Florida
Answers
Answer:
True
Explanation:
If the ΔG value of a reaction is negative, what is true of the ΔG value of the reverse reaction?
A. ΔG > 0
B. ΔG < 0
C. ΔG = 0
D. ΔG fluctuates
Answers
For equilibrium reactions, there is a forward and reverse reaction written as: A+ B ⇆ C. Only one of those reactions is spontaneous. So, if the forward reaction is -ΔG, then the reverse reaction is the opposite which is +ΔG. The answer is letter A.
The feed to a batch process contains equimolar quantities of nitrogen and methane. write an expression for the kilograms of nitrogen in terms of the total moles n(mol) of this mixture.
Answers
2) Number of moles of CH4 = n/2
3) Total number of moles of the mixture = n/2 + n/2 = n
4) Kg of N2
mass in grams = number of moles * molar mass
molar mass of N2 = 2 * 14.0 g/mol = 28 g/mol
=> mass of N2 in grams = (n/2) * 28 = 14n
mass of N2 in Kg = mass of N2 in grams * [1 kg / 1000g] = 14n/1000 kg = 0.014n kg
Answer: mass of N2 in kg = 0.014n kg