Answer:
Fluorine gas reacts with water.
What is the concentration of a solution with a volume of 0.900 L that contains 2.05 mol of iron (II) hydroxide?
Answer:
The concentration is 2.277
Explanation:
The formula for finding the concentration of a solution is C= mole of solute divided by the volume of the solution
Therefore, C= 2.05/0.900
C=2.277
What is the limiting reactant in the following equation? How much Fe2O3 will be produced if 2.1 g of Fe reacts with 2.1 g of O2?
4 Fe + 3O2 —> 2Fe2O3
Answer:
Fe is limiting reactant and 3.00g of Fe2O3 will be produced
Explanation:
To solve this question we must convert the mass of each reactant to moles and, using the reaction we can find limiting reactant. With moles of limiting reactant we can find moles of Fe2O3 and its mass as follows:
Moles Fe -Molar mass: 55.845g/mol-
2.1g * (1mol / 55.845g) = 0.0376 moles
Moles O2 -Molar mass: 32g/mol-
2.1g * (1mol / 32g) = 0.0656 moles
For a complete reaction of 0.0656 moles of O2 are needed:
0.0656moles O2 * (4mol Fe / 3 mol O2) = 0.0875 moles Fe
As there are just 0.0376 moles,
Fe is limiting reactant
The mass of Fe2O3 is:
Moles:
0.0376 moles Fe* (2mol Fe2O3 / 4mol Fe) = 0.0188 moles Fe2O3
Mass:
0.0188 moles Fe2O3 * (159.69g / mol) =
3.00g of Fe2O3 will be produced
Which equation represents the total ionic equation for the reaction of HNO3 and NaOH?
OH+ + OH -> H2O
O HNO3 + NaOH → NaNO3 + H20
OH + NO3 +Na+ + OH -> Na + NO3 + H20
OH + NO3 + OH →→ NO3 + H20
Answer:
H⁺(aq) + NO₃⁻(aq) + Na⁺(aq) + OH⁻(aq) → Na⁺(aq) + NO₃⁻(aq) + H₂O(l)
Explanation:
First, we will write the molecular equation for the neutralization reaction between nitric acid and sodium hydroxide.
HNO₃(aq) + NaOH(aq) → NaNO₃(aq) + H₂O(l)
The total ionic equation includes all the ions and the molecular species.
H⁺(aq) + NO₃⁻(aq) + Na⁺(aq) + OH⁻(aq) → Na⁺(aq) + NO₃⁻(aq) + H₂O(l)
What occurs when a reaction reaches equilibrium?
1)The concentration of the reactants increases.
2)The concentration of the products increases
3)The rate of the forward reaction is equal to the rate of the reverse reaction
4)The rate of the forward reaction is slower that the rate of the reverse reaction.
Answer:
3)The rate of the forward reaction is equal to the rate of the reverse reaction
Answer:
The Rate of Forward Reaction is equal to the rate of the reverse reaction.
Explanation:
Hope this helps :)
Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?
- The temperature is always lower.
- The temperature is always the same.
- The temperature is usually lowest
- The temperature is usually higher.
The temperature at the beginning and the end of a change of state correct option is : The temperature is usually the same.
When looking at a temperature vs. time graph during a change of state, such as melting or boiling, the temperature remains constant throughout the duration of the change. This is because during a change of state, the heat energy is used to break the intermolecular bonds rather than increase the temperature. As a result, the temperature remains constant until the entire substance has completed the phase transition.At the beginning of the change of state, the substance is at its melting or boiling point, and the temperature remains constant as the substance absorbs heat energy to transition from a solid to a liquid (melting) or from a liquid to a gas (boiling). At the end of the change of state, the substance has fully transitioned, and the temperature remains constant until all the substance has completely melted or boiled.The correct option is: The temperature is usually the same.
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The temperature at the beginning of a change is always lower than the temperature at the end of the change option A
Does the temperature increase as the phase change progresses?The temperature doesn't vary during a phase transition, such as melting or boiling, until the phase change is finished. This is so that intermolecular forces can be broken rather than the average kinetic energy of the particles, which is related to temperature, being increased by the heat energy being applied to the substance.
But the temperature does increase from one point to the other on the heating curve.
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How is matter classified,Give example for each?
Matter can be classified into 2 groups, Pure substance and Mixture.
Pure substance is a type of matter with "the same physical and chemical properties throughout the sample". Examples include tin, copper, oxygen, chlorine.
Mixtures on the other hand, are two or more combined substances that can be seperated. Some examples include smog, mud, sea water and air.
After extended stirring of a spatula sized portion of a solid drug in 100 mL of water, the drug appeared to be insoluble. Yet when the liquid was separated from the solid and heated, solid residue was observed forming as the liquid evaporated. This evidence suggests that the liquid portion of the mixture formed after stirring the drug with water was
Answer:
a saturated solution
Explanation:
A saturated solution is a solution that already contains just as much solute as it can normally hold at a given temperature.
When more solute is added to a saturated solution, the added solute does not dissolve.
The fact that when the liquid was separated and evaporated, some solid crystals were recovered means that the liquid has already dissolved the amount of solute that it can normally hold at that temperature. That is, the liquid is already a saturated solution hence more solute does not dissolve.
At 27.0°C, the volume of a gas is 630 L. At the same pressure, its volume is 92,0 mL at a temperature of
Answer:
–272.96 °C
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T₁) = 27.0 °C
Initial volume (V₁) = 630 L.
Final volume (V₂) = 92.0 mL
Final temperature (T₂) =?
Next, we shall convert 27.0 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 27.0 °C
Initial temperature (T₁) = 27.0 °C + 273
Initial temperature (T₁) = 300 K
Next, we shall convert 92.0 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
92 mL = 92 mL × 1 L / 1000 mL
92 mL = 0.092 L
Next, we shall determine the final temperature.
Initial temperature (T₁) = 300 K
Initial volume (V₁) = 630 L.
Final volume (V₂) = 0.092 L
Final temperature (T₂) =?
V₁ / T₁ = V₂ / T₂
630 / 300 = 0.092 / T₂
2.1 = 0.092 / T₂
Cross multiply
2.1 × T₂ = 0.092
Divide both side by 2.1
T₂ = 0.092 / 2.1
T₂ = 0.04 K
Finally, we shall convert 0.04 K to celsius temperature. This can be obtained as follow:
T(°C) = T(K) – 273
Final temperature (T₂) = 0.04 K
Final temperature (T₂) = 0.04 – 273
Final temperature (T₂) = –272.96 °C
A 251 ml sample of 0.45M HCl is added to 455 mL of distilled water. What is the molarity of the
final solution?
We are given:
251 mL sample of 0.45M HCl added to 455 mL distilled water
Whack a mole! (finding the number of moles):
We know that in order to find molarity, we use the formula:
Molarity = number of moles / Volume (in L)
so, number of moles is:
Number of moles = Molarity * Volume(in L)
now let's plug the values for the HCl solution to find the number of moles
Number of moles = 0.45M * 0.251 L
Number of moles = 0.113 moles
Time to concentrate (finding the final concentration):
Total final volume = 251 mL + 455 mL = 706 mL = 0.706 L
Number of moles of HCl = 0.113 moles
Molarity = Number of moles / Volume (in L)
Molarity = 0.113 / 0.706
Molarity = 0.16 M
___________________________________________________________
BONUS METHOD TIME!!!
We know the relation:
M1 * V1 = M2 * V2
where M1 and M2 are the initial and final molarities and V1 and V2 are initial and final volumes respectively
notice that I didn't mention that the volume has to be in Liters, that's because of the units being concerned with both sides of the equation, say I have the volume in mL and want to convert both these volumes to L, I would divide both sides by 1000, which would NOT change the overall value
Now, plugging values in this equation
(0.45) * (251) = (251 + 455)* (M2)
112.95 = (706)(M2)
M2 = 112.97/706 [dividing both sides by 706]
M2 = 0.16 Molar
Under the right conditions aluminum will react with chlorine to produce aluminum chloride.
2 Al + 3Cl2 -> 2 AlCl3
How many grams of aluminum chloride can be produced when 157.0g of aluminum react with excess chlorine?
Answer:775.9 g AlCl3
but what the steps pls help
Answer:
775.9 g
Explanation:
Step 1: Write the balanced equation
2 Al + 3 Cl₂ ⇒ 2 AlCl₃
Step 2: Calculate the mass corresponding to 157.0 g of Al
The molar mass of Al is 26.98 g/mol.
157.0 g × 1 mol/26.98 g = 5.819 mol
Step 3: Calculate the moles of AlCl₃ produced from 5.819 moles of Al
The molar ratio of Al to AlCl₃ is 2:2. The moles of AlCl₃ produced are 2/2 × 5.819 mol = 5.819 mol.
Step 4: Calculate the mass corresponding to 5.819 moles of AlCl₃
The molar mass of AlCl₃ is 133.34 g/mol.
5.819 mol × 133.34 g = 775.9 g
[H+] [OH-] =
NEED HELP ASAP!!!
A bottle labeled 0.01 M HCl is found in the laboratory. Assuming that the HCl is completely ionized calculate the [H+], [OH-] and the pH of the solution.
Answer:
[H⁺] = 0.01 M[OH⁻] = 1x10⁻¹² MpH = 2Explanation:
The assumption that the HCl is completely ionized means that the original concentration of the acid is equal to [H⁺].
[H⁺] = 0.01 MWith [H⁺], we can calculate [OH⁻], by using the following formula:
[H⁺] * [OH⁻] = 10⁻¹⁴0.01 M * [OH⁻] = 10⁻¹⁴[OH⁻] = 1x10⁻¹² MFinally we calculate the pH of the solution:
pH = -log[H⁺]pH = 2Which of the following substances can be dissolved in pure water to give a basic solution?
Hydrogen chloride
Sodium bromide
Sodium hydroxide
Sodium chloride
I think it's sodium hydroxide
Explanation:
sodium hydroxide is a base
Consider the aldol-dehydration reaction. Draw the two possible products of the reaction between benzaldehyde and methylethylketone. (Do not draw the products of the double-condensation.)
Solution :
An [tex]$\text{aldol condensation}$[/tex] reaction is a type of [tex]\text{condensation reaction}[/tex] in organic chemistry where the enol or an enolate ion reacts with the carbonyl compound and forms a [tex]$\beta$[/tex]-hydroxyaldehyde or a [tex]$\beta$[/tex]-hydroxyketone, and then followed by a dehydration to give conjugated enone.
Benzaldehyde reacts with methylketone and forms two products:
How many particle in 3.5 of CO2
Answer:
Carbon dioxide (chemical formula CO
2) is an acidic colorless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas. The current concentration is about 0.04% (412 ppm) by volume, having risen from pre-industrial levels of 280 ppm.[8] Natural sources include volcanoes, hot springs and geysers, and it is freed from carbonate rocks by dissolution in water and acids. Because carbon dioxide is soluble in water, it occurs naturally in groundwater, rivers and lakes, ice caps, glaciers and seawater. It is present in deposits of petroleum and natural gas. Carbon dioxide has a sharp and acidic odor and generates the taste of soda water in the mouth.[9] However, at normally encountered concentrations it is odorless.[1]
Carbon dioxide

Explanation:
As the source of available carbon in the carbon cycle, atmospheric carbon dioxide is the primary carbon source for life on Earth and its concentration in Earth's pre-industrial atmosphere since late in the Precambrian has been regulated by photosynthetic organisms and geological phenomena. Plants, algae and cyanobacteria use light energy to photosynthesize carbohydrate from carbon dioxide and water, with oxygen produced as a waste product.[10]
CO2 is produced by all aerobic organisms when they metabolize organic compounds to produce energy by respiration.[11] It is returned to water via the gills of fish and to the air via the lungs of air-breathing land animals, including humans. Carbon dioxide is produced during the processes of decay of organic materials and the fermentation of sugars in bread, beer and wine making. It is produced by combustion of wood, peat and other organic materials and fossil fuels such as coal, petroleum and natural gas. It is an unwanted byproduct in many large scale oxidation processes, for example, in the production of acrylic acid (over 5 million tons/year).[12][13][14]
It is a versatile industrial material, used, for example, as an inert gas in welding and fire extinguishers, as a pressurizing gas in air guns and oil recovery, as a chemical feedstock and as a supercritical fluid solvent in decaffeination of coffee and supercritical drying.[15] It is added to drinking water and carbonated beverages including beer and sparkling wine to add effervescence. The frozen solid form of CO2, known as dry ice is used as a refrigerant and as an abrasive in dry-ice blasting. It is a feedstock for the synthesis of fuels and chemicals.[16][17][18][19]
Carbon dioxide is the most significant long-lived greenhouse gas in Earth's atmosphere. Since the Industrial Revolution anthropogenic emissions – primarily from use of fossil fuels and deforestation – have rapidly increased its concentration in the atmosphere, leading to global warming. Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid.[20]
Study the reaction.
CH4 + 2O2 → CO2 + 2H2O
If 7.4 moles of carbon dioxide (CO2) form at the end of the reaction, how many moles of methane (CH4) and oxygen gas (O2) entered the reaction?
? moles of methane and
? moles of oxygen gas
7.4 moles of methane (CH₄)
14.8 moles of oxygen gas (O₂)
Help Me plz I'm so tired
If 3.13 mol of an ideal gas has a pressure of 2.33 atm and a volume of 72.31 L, what is the temperature of the sample in degrees Celsius?
Answer:
382.49 C degree Celsius
Explanation:
Hello,
This problem deals with understanding the ideal gas law which hopes to predict how ideal gases might behave in any given condition. I listed the formula below and we are basically just going to solve for temperature by rearranging the equation as seen on the picture (there's also other rearranged ones in case you need to solve for those).
Universal gas constant R has a value of 0.0821 L * atm/(mole * K) when working with these given units so it will be part of this equation. R value changes based on what units you have.
T = PV/nR
= (2.33) (72.31) / (3.13)(0.0821)
= 655.64 K
Question is asking temperature in celsius so we employ the formula attached below:
C = K - 273.15
= 655.64-273.15
= 382.49 degree Celsius
382.49 degree Celsius is the answer!
Do u believe that you are beautiful/handsome?
Yes or No?
what is the partial pressure of each gas in a 26L container at 27°c that holds 5 moles of carbon dioxide,3.3 moles of nitrogen and 1.5 moles of hydrogen, and has a total pressure of 1.05
Answer:
pCO₂ = 0.54 atm
pN₂ = 0.35 atm
pH₂ = 0.16 atm
Explanation:
Step 1: Calculate the total number of gaseous moles
The total number of gaseous moles (n) is equal to the sum of the moles of the individual gases.
n = nCO₂ + nN₂ + nH₂ = 5 mol + 3.3 mol + 1.5 mol = 9.8 mol
Step 2: Calculate the partial pressure of each gas
We will use the following expression.
pi = P × χi
where,
pi: partial pressure of the gas i
P: total pressure (1.05 atm)
χi: mole fraction of the gas i
pCO₂ = 1.05 atm × (5 mol/9.8 mol) = 0.54 atm
pN₂ = 1.05 atm × (3.3 mol/9.8 mol) = 0.35 atm
pH₂ = 1.05 atm × (1.5 mol/9.8 mol) = 0.16 atm
How do atoms combine to form all of the diverse types of matter in our universe?
Pls, Help with a good valid answer and explanation. will mark brainliest.
Answer:
Using electrons.
Explanation:
The properties of matter depend on the types of atoms that matter is made of. Matter can exist in two forms. It can be a pure substance. (ck12.org)
Atoms combine, or bond, using their electrons. When atoms from two or more different elements bond, they form a compound. (resources.finalsite.net) Atoms form chemical bonds with other atoms when there's an electrostatic attraction between them. This attraction results from the properties and characteristics of the atoms' outermost electrons, which are known as valence electrons. (wonderpolis.org)
Something like this??
When electrons move to a shell closer to the nucleus, energy is released as
Answer:
it is released as lower energy
lower energy will be the answer
hope it helps!!!!!
Draw the major organic product in the reaction scheme. Be sure to clearly show stereochemistry (if applicable). The starting material is an alkyne where carbon 1 is bonded to cyclopentane and carbon 2 is bonded to H. Step 1 is N a N H 2. Step 2 is C H 3 I. Step 3 is sodium in liquid ammonia. Draw the major organic product.
Answer:
See answer below
Explanation:
The picture below will show you the final product and mechanism.
In the first step, the NaNH₂ is a strong base, so, this base will substract the hydrogen from carbon 2, to generate a negative charge there, and then, carbon 2 becomes a nucleophyle.
As a nucleophyle it will attack to the CH₃I in the next step, and it will attach to the CH₃.
The second step is just a regular step to reduce the triple bond of the alkyne to alkane or alkene, this will depend on the quantity of the reactant. In this case, an alkene.
Hope this helps,,,,,,k
Besides filament-based detectors, what else are sometimes used to find flammable liquids?
A. Radar detectors
B. Dogs
C. Chemical sprays
D. Carbon monoxide detectors
Answer:
D
Explanation:
can u be my friend i'm new
Besides filament-based detectors, sometimes used to find flammable liquids are carbon monoxide detectors. Hence option D is correct.
What are detector?Detector are defined as a tool for detecting the presence of radioactivity or electromagnetic waves. Since 1881, metal detectors have been employed for diagnostic purposes. They have been used to identify a wide range of foreign bodies and medical equipment, including bullets, intraocular metallic pieces, ingested coins, and other foreign things. Detecting metallic things quickly may help with diagnosis or therapy.
Carbon monoxide detectors are defined as a tool that looks for carbon monoxide (CO) gas to stop carbon monoxide poisoning. The purpose of CO alarms is to alert you to any unexpected CO buildup in your home. These greater levels of CO may be brought on by fuel-burning appliances that are not properly maintained, installed, or operated, by fireplaces or appliances that draft backward, or by idling cars in garages.
Thus, besides filament-based detectors, sometimes used to find flammable liquids are carbon monoxide detectors. Hence option D is correct.
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Which describes the sequence of events of the development of the universe?
big bang → star and galaxy formation → expansion and cooling → atom formation → continuation of expansion and cooling
atom formation → star and galaxy formation → expansion and cooling → continuation of expansion and cooling → big bang
atom formation → big bang → star and galaxy formation → expansion and cooling → continuation of expansion and cooling
big bang → expansion and cooling → atom formation → star and galaxy formation → continuation of expansion and cooling
Answer:
big bang → expansion and cooling → atom formation → star and galaxy formation → continuation of expansion and cooling
Explanation:
Answer:
D: big bang → expansion and cooling → atom formation → star and galaxy formation → continuation of expansion and cooling
Explanation:
i just took the quiz and it was right! :)
8
What happens to solid waste in the circulatory system?
A it's expelled through the lungs
B
It pumps into the coronary circulation
C
It's dropped off in the kidneys
D
It's deposited in the aorta
Answer:c it’s dropped off in the kidneys
Explanation:
I took the quiz
The solid wastes are from the circulatory system is expelled to the kidney where, the nitrogenous wastes like urea and uric acid is excreted as urine from the body.
What is circulatory system ?A circulatory system is an organ system, where the blood is purified and oxygenation of blood takes place. Through circulatory system, the blood reaches throughout the body pumped from the heart through veins.
The organs included in circulatory system are lungs, heart, aorta, veins, blood vessels etc. There are various kinds of blood vessels each having specific functions.
There is a network of blood vessels including arteries and large veins, capillaries that join the venules and other veins. All the nutrients and ions are circulated throughout the body through blood and solid wastes are then expelled to kidney.
Kidney function as a sieve to clean the good fluid from waste products. Uric acid and urea along with water excreated as urine then. Thus, option C is correct.
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how many molecules are in 0.610 moles of neon gas?
A bowl containing 70 grams of water, is heated from 10 °C to 90 °C. The specific heat of
water is 4.184 J/gºC. How much heat energy is required to heat the water?
Answer:
23430.4 J.
Explanation:
From the question given above, the following data were obtained:
Mass (M) = 70 g
Initial temperature (T₁) = 10 °C
Final temperature (T₂) = 90 °C
Specific heat capacity (C) = 4.184 J/gºC
Heat (Q) required =?
Next, we shall determine the change in the temperature of water. This can be obtained as follow:
Initial temperature (T₁) = 10 °C
Final temperature (T₂) = 90 °C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 90 – 10
ΔT = 80 °C
Finally, we shall determine the heat energy required to heat up the water. This can be obtained as follow:
Mass (M) = 70 g
Change in temperature (ΔT) = 80 °C
Specific heat capacity (C) = 4.184 J/gºC
Heat (Q) required =?
Q = MCΔT
Q = 70 × 4.184 × 80
Q = 23430.4 J
Therefore, 23430.4 J of heat energy is required to heat up the water.
The cation that has the same number of electrons (isoelectronic) as Ne is
None of the listed options
O Na
Mg 2-
All of the listed options
O AI 3-
If the pH of a solution is 6.96, then the solution is a
Answer:
acid
Explanation:
solution with pH less than 7 is acid
those with more that 7 is base
those equal to 7 is neutral