Answer:
nitrogen
Explanation:
based on the table below, what is the density of material A?
I need help on my homework I don’t know this answer
Answer:
I believe the answer would be
b.) valence electrons, all thw electrons that surround the nucleus of an atom
Explanation:
You're welcome
How many moles of water will be produced from the combustion of 0.27 moles of CH3OH?
Answer:
0.54 mole of H2O.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2CH3OH + 3O2 —> 2CO2 + 4H2O
From the balanced equation above,
2 moles of CH3OH reacted to produce 4 moles of water.
Finally, we shall determine the number of mole of water (H2O) produced by the reaction of 0.27 moles of CH3OH. This can be obtained as follow:
From the balanced equation above,
2 moles of CH3OH reacted to produce 4 moles of water.
Therefore, 0.27 moles of CH3OH will react to produce = (0.27 × 4)/2 = 0.54 mole of H2O.
Thus, 0.54 mole of H2O is produced from the reaction.
30 Points!
Which of the following tasks falls under the responsibility of a forensic scientist?
Cleaning the crime scene after evidence has been collected
Making the final determination as to if a suspect is, in fact, guilty of the crime
Signing search warrants
Training officers in how to collect evidence
Question 3 of 25
What is another name for Group 14?
Answer:
4A
Explanation:
on the periodic table
A lidded glass container is filled with a colored gas. After a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. Next, a warm iron plate is carefully placed under the box. Why is there resumed movement of the gas in the container?
A) The warm iron plate absorbed energy from the gas particles, making them move faster.
B) The warm iron plate vibrated due to the energy it had, disturbing the gas in the process.
C) Heat from the warm iron plate transferred energy to the gas particles, making them move faster.
D) The warm iron plate heated the insulated box causing it to vibrate, disturbing the gas in the process.
Answer:
It's not A, it's likely not C? I'm guessing B or D.
From top to bottom within a group of the periodic table, first ionization energy tends to *
A. increase.
B. decrease.
C. remain approximately the same.
D. change in an irregular way.
Answer:
B. decrease.
Explanation:
Because size of atom increases so it is easy to remove electron
A solution has a pH of 11.75. Calculate the [H:0*] of the solution
The [H₃0⁺] of the solution : 1.778 x 10⁻¹² M
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.
pH of solution = 11.75
the [H₃0⁺] of the solution :
[tex]\tt pH=-log[H_3O^+]\\\\11.75=-log[H_3O^+]\\\\(H_3O^+]=10^{-11.75}=1.778\times 10^{-12}[/tex]
Carbonic acid (H2CO3) is a polyprotic acid. Write balanced chemical equations for the sequence of reactions that carbonic acid can undergo when it's dissolved in water.
Answer:
H₂CO₃(aq) ⇄ H⁺(aq) + HCO₃⁻(aq)
HCO₃⁻(aq) ⇄ H⁺(aq) + CO₃²⁻(aq)
Explanation:
Carbonic acid (H₂CO₃) has 2 acidic protons. When is dissolved in water, it loses the protons (H⁺) in two sequential steps:
- First, it loses 1 proton to form the hydrogen carbonate ion (HCO₃⁻)
H₂CO₃(aq) ⇄ H⁺(aq) + HCO₃⁻(aq)
- Then, the acid carbonate anion loses its proton to form carbonate ion (CO₃²⁻):
HCO₃⁻(aq) ⇄ H⁺(aq) + CO₃²⁻(aq)
How many joules are required to melt 250 grams of water
Answer:
i not sure but i searched it up and it said Q=104525J
Explanation:
Compare the properties of solid , liquid , and gas?
Use calc to determine whether it is possible to remove 99.99% Cu2 by converting it to Cu(s) in a solution mixture containing 0.12 Cu2 and 0.12 MSn2 suppose it is at room temperature.
Answer:
it is possible to remove 99.99% Cu2 by converting it to Cu(s)
Explanation:
So, from the question/problem above we are given the following ionic or REDOX equations of reactions;
Cu2+ + 2e- <--------------------------------------------------------------> Cu (s) Eo= 0.339 V
Sn2+ + 2e- <---------------------------------------------------------------> Sn (s) Eo= -0.141 V
In order to convert 99.99% Cu2 into Cu(s), the equation of reaction given below is needed:
Cu²⁺ + Sn ----------------------------------------------------------------------------> Cu + Sn²⁺.
Therefore, E°[overall] = 0.339 - [-0.141] = 0.48 V.
Therefore, the change in Gibbs' free energy, ΔG° = - nFE°. Where E° = O.48V, n= 2 and F = 96500 C.
Thus, ΔG° = - 92640.
This is less than zero[0]. Therefore, it is possible to remove 99.99% Cu2 by converting it to Cu(s) because the reaction is a spontaneous reaction.
A student in chemistry class mixes two clear solutions together. Which of the following is the best evidence that a chemical reaction has occurred?
Question 5 options:
The solutions are soluble when mixed together.
The volume of the liquids increased.
A Yellow precipitate is formed when mixed together.
One liquid is insoluble in the other liquid.
Answer:
a yellow precipitate is formed when mixed together
A student in chemistry class mixes two clear solutions together. Then, a Yellow precipitate is formed when mixed together.
What is the solution ?A particular kind of homogenous combination made up of two or more components is known as a solution. A solute is a material that has been dissolved in a solvent, which is the other substance in the combination.
In a combination called a solution, every component is well combined. Solutions can contain solids, liquids, and gases and are regarded as homogenous mixes. A solute plus a solvent makeup a solution. Any material that dissolves in a solvent is referred to as a solute.
Solid, liquid, and gaseous solutions can be classified as solutions based on the physical states of the solvent and solute. Both the solute and the solvent are in the solid state in solid solutions.
Thus, option C is correct.
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Suppose you are titrating an acid of unknown concentration with a standardized base. At the beginning of the titration, you read the base titrant volume as 2.04 mL. After running the titration and reaching the endpoint, you read the base titrant volume as 20.95 mL.
1. What volume, in mL, of base was required for the titration?
2.Calculate the mass percent of a vinegar solution with a total mass of 96.92 g that contains 2.28 g of acetic acid.
Answer:
1) 18.91 mL
2) 2.35 %
Explanation:
1. The volume of base that was required is equal to the difference between the reading at the end of the titration and the reading at the beginning:
V = 20.95 mL - 2.04 mL = 18.91 mL2. The mass percent can be written as:
Mass Percent = Mass solute / Total mass * 100%For this problem:
Mass solute = 2.28 gTotal mass = 96.92 gWe input the data and calculate the mass percent:
% mass = 2.28/96.92 * 100% = 2.35 %Which is an example of a compound? * He3 or H2O or C
Answer:
H2O
Explanation:
There is more than one element
A buffer is prepared by adding 24.6 mL of 0.65 M to 49.6 mL of 0.28 M. What is the pH of the final solution?
The given question is incomplete, the complete question is:
A buffer is prepared by adding 24.6 mL of 0.65 M NaF to 49.6 mL of 0.28 M HF. What is the pH of the final solution?
Answer:
The correct answer is 3.23.
Explanation:
The calculations of pH in a buffer solution is determined with the help of Henderson-Hasselbalch equation, that is,
pH = pKa + log[conjugate base]/[acid]
= pKa + log[A⁻][HA]
Here Ka is the equilibrium constant.
Based on the given information, the volume and concentration of NaF is 24.6 ml and 0.65 M. Now the millimoles of NaF can be determined by using the formula,
millimoles = Molarity × Volume
= (0.65 M) (24.6 ml) (1 mmol/ml/1M)
= 16 mmol
Thus, the millimoles of NaF or F⁻ is 16 mmol.
On the other hand, the volume and concentration given of HF is 49.6 ml and 0.28 M. Now the millimoles of HF will be,
Millimoles = 0.28 M × 49.6 ml (1mmol/ml/1M)
Millimoles = 13.9 mmol
Thus, the millimoles of HF is 13.9 mmol.
The value of Ka for strong acid is 6.8 × 10⁻⁴.
Now the pH of the buffer solution can be determined by using the above mentioned Henderson-Hasselbalch equation,
pH = pKa + log[F⁻]/[HF]
= -logKa + log[16 mmol]/[13.9 mmol]
= -log(6.8 × 10⁻⁴) + 0.06
= 3.17 + 0.06
= 3.23.
Hence, the pH of the solution is 3.23.
Why do the carbon anodes need to be replaced regularly in the electrolysis of Al2O3 into aluminum metal?
A) They get oxidized into carbon monoxide and carbon dioxide by the oxygen molecules generated on the electrode.
B) The intense heat for the reaction breaks them apart.
C) They become saturated with aluminum metal.
D) They get oxidized by air in the intense heat of the reaction.
Answer:
A) They get oxidized into carbon monoxide and carbon dioxide by the oxygen molecules generated on the electrode.
Explanation:
In the electrolysis of Aluminium, the oxygen reacts with the carbon anodes forming carbon dioxide. That is, the anodes are oxidized. To ensure that the reaction completes, the anode must gradually be replaced as the reaction proceeds. The correct option is hence;
A) They get oxidized into carbon monoxide and carbon dioxide by the oxygen molecules generated on the electrode.
Please respond guys I’ll give brainliest and 100 points
Compare and contrast the reactions of lithium and cesium when they are added to water. At least 5 sentences
Answer:Both lithium and cesium are classified as alkali metals because they both have just one electron in their outermost shell.
The electronic configuration of both atoms are:
Lithium = 2, 1
Cesium = 2, 8, 18, 18, 8, 1
Explanation:
S this true or false most energy we use comes from fossil fuels
Answer:
True. Hope this helps. :)
A balloon contains a mixture of 2 gases, X and Y. If the pressure in the balloon is 1.50 atm and there are 3 moles of X and 7 moles of Y present, what is the partial pressure of each gas?
Answer:
Partial Pressure of X = 0.45 atm
Partial Pressure of Y = 1.05 atm
Explanation:
Mixture of gas = Gas X + Gas Y
Total number of moles = 3 + 7 = 10 moles
Total pressure = 1.50 atm
The relationship between partial pressure, total pressure and number of moles is given as;
Partial pressure of gas X / Total pressure = Number of moles of gas X / Total number of moles
Partial Pressure of gas X / 1.50 = 3 / 10
Partial Pressure of gas X = 1.5 * 3 / 10 = 0.45 atm
The total pressure of a mixture is a sum total of the individual pressures, hence;
Pressure of mixture = Partial Pressure of X + Partial pressure of Y
1.5 = 0.45 + Partial pressure of Y
Partial Pressure of Y = 1.5 - 0.45 = 1.05 atm
How many atoms of oxygen are present in the reactants
6CO2+6H2O=C6H12O6+6O2
Answer:
3.6132 * 10^24 atoms/molecules of 02
Explanation:
When we look at the balanced chemical equation, we can see that there are 6 moles of O2.
In order to convert from moles to formula units (atoms and molecules),
you need to multiply by avogadro's number.
6 moles * [tex]6.022*10^{23}[/tex]/1 mol = 3.6132 * 10^24 atoms/molecules of 02
A 12.0% sucrose solution by mass has a density of 1.05 gem, what mass of sucrose is present in a 32.0-mL sample of this solution?
A) 0.126g
B) 3.66g
C) 4.03g
D) 3.84g
E) 280 g
Answer:
Option C. 4.03 g
Explanation:
Firstly we analyse data.
12 % by mass, is a sort of concentration. It indicates that in 100 g of SOLUTION, we have 12 g of SOLUTE.
Density is the data that indicates grams of solution in volume of solution.
We need to determine, the volume of solution for the concentration
Density = mass / volume
1.05 g/mL = 100 g / volume
Volume = 100 g / 1.05 g/mL → 95.24 mL
Therefore our 12 g of solute are contained in 95.24 mL
Let's finish this by a rule of three.
95.24 mL contain 12 g of sucrose
Our sample of 32 mL may contain ( 32 . 12) / 95.24 = 4.03 g
How many atoms of carbon are present in the products?
6CO2+6H2O=C6H12O6+6O2
Answer:
2.41 * 10^24 atoms of carbon present in the products.
Explanation:
First, we need to find the moles of carbon in the products in order to find the number of atoms.
We see that in the chemical formula, carbon belongs to the compound known as glucose. To get the amount of moles of carbon, we need to divide my the amount of carbon within glucose (in grams) from the total amu ( or grams) of glucose to get the moles.
C6 = 72.066.
C6H12O6 = 180.156
72.066/180.156 = 0.4000199827 moles of Carbon within the Glucose compound
Now we will convert to atoms/molecules by multiplying the moles by avogadro's number..
0.4000199827 moles C * 6.022*[tex]10^{23}[/tex] = 2.408920336 *[tex]10^{24}[/tex] atoms of Carbon present in the products
*Note --> this can be estimated to 2.41 * [tex]10^{24}[/tex] atoms of Carbon
Based on the information in the table, which of the following arranges the bonds in order of decreasing
polarity?
Choose 1 answer:
H-S > Sn-Te > Si-F
Sn-Te > H-S > Si-F
Si-F>H-S > Sn-Te
Si-F > Sn-Te > H-S
Answer:
what grade so i can help
Explanation:
Answer:
I believe it’s Sn-Te > H-S > Si-F
Explanation:
How much excess reactant remains from the reaction of 8.3g of sodium and 4.5g of chlorine?
a. 8.2g Na
b. 5.4g Na
c. 5.4g Cl2
d. 8.2g Cl2
Answer:
5.4 g Na
Explanation:
Calculate the mass of sodium chloride from both reactants. The lesser value is the amount is the theoretical yield. Subtract the mass of the calculated mass of sodium chloride from the mass of the reactants.
Which sentence from “Broken Chain” contains the most descriptive language? “He asked his mother if he could have braces, like Frankie Molina, her godson, but he asked at the wrong time.” “He went to the back yard, where he unlocked his bike, sat on it with the kickstand down, and pressed on his teeth.” “Sunday morning, Ernie and Alfonso stayed away from each other, though over breakfast they fought over the last tortilla.” “At four he decided to get it over with and started walking to Sandra’s house, trudging slowly, as if he were waist-deep in water.”
Answer:
" At four he decided to get it over with and started walking to Sandra's house, trudging slowly, as if he were waist-deep in water. "
Explanation:
The sentence "At four he decided to get it over with and started walking to Sandra's house, trudging slowly, as if he were waist-deep in water" is the most descriptive language.
What is descriptive language?Descriptive language is a technique that are used in speaking and writing which involves a detailed description of a place or a person.
It's intended to create a vivid and specific picture in the reader's mind to give them a better feel for the story
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Question 8 (3 points) What is the formula for Silver (III) sulfide? O Ag2(SO4)3 O Ag3(SO4)2 Ag3S2 Ag2S3
The formula of Silver (III) Sulfide is Ag2S3.
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Middle school science help please. ill give brainliest
Answer:
It converts The liquid into a gas at the same temperature.
Explanation:
Answer:
it converts the liquid into gas at the same temperature
Explanation:
when heat is added to a liquid at boiling temperature it converts the liquid into gas at that same boiling temperature
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What are the roles of chlorophll, light, carbon dioxide, and water in the production of food and oxygen for a plant? (15 points to answer)
Explanation:
Chlorophyll make food the plant can use from carbon dioxide, water, nutrients, and energy from sunlight. This process is called photosynthesis. During the process of photosynthesis, plants release oxygen into the air. People and animals need oxygen to breathe.
hope it helps!
Occurs when the membrane surrounds a large substance and engulfs it.
) Active Transport
O Diffusion
O Endocytosis
Exocytosis