what does the Law of Conservation say?
Answers
Answer:
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
Explanation:
yw <3
Answer:
energy cannot be created or destroyed. it is instead transferred from one form to another
Explanation:
Related Questions
Which medicines are including Chemicals?
Can you help Please!
Answers
Answer:
Compounds used as medicines are most often organic compounds, which are often divided into the broad classes of small organic molecules (e.g., atorvastatin, fluticasone, clopidogrel) and "biologics" (infliximab, erythropoietin, insulin glargine), the latter of which are most often medicinal preparations of proteins
5
Select the correct answer.
If a stone dropped into a well reaches the water's surface after 3.0 seconds, how far did the stone drop before hitting the water?
ОА
1.4 meters
OB.
44 meters
Ос.
49 meters
OD
54.2 meters
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on samantium All riachte nennund
mentum com/assessments delivery
Answers
Answer:
s= 0.5 at^2
0.5 x 9.81 x 3^2 = 44m
Explanation:
OB.
44 meters
Learning to be safe in chemistry laboratories is best accomplished by Select one: Performing experiments to see what’s safe and what isn’t Memorizing safety rules Thinking about the hazards and risks associated with experiments Learning from one’s own mistakes
Answers
Answer:
I think C is the most reasonable answer
In a sample of 400 lithium atoms, it is found that 30 atoms are lithium-6 (6.015 amu) and
370 atoms are lithium-7 (7.016 amu). What is the average atomic mass?
Answers
Answer:
667.3
Explanation:
What is a column called in the periodic table and what do the elements in each column have in common?.
Answers
The elements in the same column of the periodic table was having a same amount of valence electrons.
define valence electrons ?
A valence electron is an electron connected with an atom in the outer shell that can participate in the production of a chemical bond if the outer shell is not closed. A shared pair originates in a single covalent connection, with both atoms donating one valence electron.
The existence of valence electrons can influence an element's chemical characteristics, such as its valence—whether it can connect with other elements and, if so, how easily and how many times. In this approach, the reactivity of a particular element is strongly reliant on its electrical arrangement. A valence electron can only reside in the outermost electron shell of a main-group element; a valence electron can also exist in the innermost electron shell of a transition metal.
The elements in the same column of the periodic table was having a same amount of valence electrons.
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PLEASE HELP ME!!!!!!
1.) List the actual volume of titrant needed to produce a color change for Sample A and Sample B. Answer:
Volume of titrant needed to produce a color change for Sample A: ___ ml Volume of titrant needed to produce a color change for Sample B: ___ ml
2.) There are many aspects to the technique known as titration that are extremely important if results are to be accurate. In a traditional or authentic laboratory setting, these techniques are important and sometimes delicate. List two of the techniques used in this lab that provided you will the most accurate possible results. Describe why these techniques are important and how ignoring the techniques would affect the lab.
Answer:
Technique #1: …
Why technique is important: …
Technique #2: …
Why technique #2 is important: …
3.) The titration procedure you have just performed is similar to what is carried out by water-quality workers throughout the world. They use a kit to perform titration on location instead of in a laboratory. In real-life situations, workers collect water samples in a lake or stream. In lakes and streams calcium carbonate (CaCO3) causes alkalinity. Calcium carbonate acts as a buffer, a substance that serves to resist small changes in acidity or alkalinity in a solution. When acid rain enters lake water, it can be neutralized by the bases present and thus the lake does not become too acidic. Since the key ion is the hydroxide ion, the nature of the location doesn’t matter in this case. All over the world, right now, pollution workers are measuring calcium carbonate in lakes and streams.
If a worker studied two lakes and Lake X had a greater ppm (concentration in parts per million) of calcium carbonate than Lake Z, and both lakes are the exact same size, which of the two lakes would be able to withstand a greater amount of rain that is acidic? Explain your answer.
Answer:
Lake ___ would be able to withstand a greater amount of acid rain.
Explanation: …
Answers
Answer:
the first answer will be for A. 35 and second B. 47 then second no t dude
A 2.0 L container of nitrogen gas had a pressure of 3.2 atm. What volume would be necessary to decrease the pressure to 1.0 atm
Answers
Answer:
6.4 L
Explanation:
When all other variables are held constant, you can use Boyle's Law to find the missing volume:
P₁V₁ = P₂V₂
In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can find the theoretical volume by plugging the given values into the equation and simplifying.
P₁ = 3.2 atm P₂ = 1.0 atm
V₁ = 2.0 L V₂ = ? L
P₁V₁ = P₂V₂ <----- Boyle's Law
(3.2 atm)(2.0 L) = (1.0 atm)V₂ <----- Insert values
6.4 = (1.0 atm)V₂ <----- Simplify left side
6.4 = V₂ <----- Divide both sides by 1.0
Answer:
6.4L or C on Brainly.
Explanation:
the process used to mine salts by filling shallow ponds with sea water is
Answers
The process used to mine salts by filling shallow ponds with seawater is known as solar salt production.
The process of mining salts by filling shallow ponds with seawater is called solar salt production. It is a method commonly used to extract salt from seawater on a large scale. The process takes advantage of the natural evaporation of water under the sun, leaving behind concentrated salt crystals that can be collected and processed.
The process begins by selecting suitable coastal areas or salt flats, typically in arid or semi-arid regions with access to the sea. These areas are usually flat and have low rainfall, facilitating the evaporation process. Shallow ponds or basins, also known as salt pans or evaporation ponds, are constructed to contain the seawater.
Seawater is then pumped into these ponds or is allowed to flow in naturally during high tide. The ponds are designed to maximize the exposure of seawater to sunlight and heat. The sun's energy drives the evaporation process, causing the water to gradually evaporate, leaving behind concentrated brine solutions.
Over time, as the water continues to evaporate, the salt concentration in the remaining brine increases. The concentrated brine, also known as bittern, becomes supersaturated with dissolved salts, including sodium chloride and other minerals. As the saturation point is reached, salt crystals begin to precipitate and form salt beds at the bottom of the ponds.
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WILL GIVE BRAINLIEST FOR THE RIGHT ANSWER!!!!!Which elements can form diatomic molecules joined by a single covalent bond?
A. hydrogen only
B. halogens only
C. halogens and members of the oxygen group
D. hydrogen and the halogens only
Answers
Answer:
b
Explanation:
that's the answerer
what is the percent of carbon in an unknown hydrocarbon that is found to contain 21.7 grams of carbon and 4.85 grams of hydrogen?
Answers
A hydrocarbon is an organic compound in organic chemistry that is made entirely of hydrogen and carbon.
carbon 81.7%
What Is a Hydrocarbon ?Crude oil, natural gas, and coal are all examples of hydrocarbons, which are organic compounds made of hydrogen and carbon. The world's primary energy source and a highly combustible substance, hydrocarbons. Petrol, jet fuel, propane, kerosene, and diesel are just a few of its uses.A hydrocarbon is an organic compound in organic chemistry that is made entirely of hydrogen and carbon.Examples of group 14 hydrides include hydrocarbons. The majority of hydrocarbons are colorless and hydrophobic, and their odors are typically insignificant or best characterized by those of gasoline and lighter fluid. They can be gases (like methane and propane), liquids (like hexane and benzene), low melting solids, and a wide variety of other molecular forms.To learn more about : Hydrocarbons
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when 100g of gaseous water decomposes 1337 kj of heat are used by the reaction. how much heat would be needed to decompose water and produce 17g of oxygen
Answers
255.7 KJ of heat is needed to decompose water and produce 17g of oxygen.
Balance chemical reaction is given by,
H₂O → H₂ + 1/2 O₂ .
Atomic mass of H = 1 u ,
Atomic mass of O = 16 u ,
Molar mass of H₂O = 2 × 1 + 1 × 16 = 18 g/mol ,
Molar mass of O₂ = 2 × 16 = 32 g/mol ,
Moles = mass/molar mass ,
Moles of H₂O = 100/18 = 5.555 mol ,
Moles of O₂ = 17/32 = 0.5312 mol ,
From balanced chemical reaction :
1 mol H₂O --------> 0.5 mol O₂
x --------> 0.5312 mol O₂ .
x = 0.5312/0.5 = 1.0625 mol H₂O
Moles of H₂O = 1.0625 mol ,
Hence ,
5.555 mol H₂O ----------> 1337 KJ
1.0625 mol H₂O ----------> x
x = 1.0625 mol H2O × 1337 KJ/5.555 mol H₂O
x = 255.7 KJ .
Heat = 255.7 KJ .
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Số oxi hoá của nitơ trong NH3, H2SO4, NO3 lần lượt là:
Answers
Answer:
3,6,6...................................
Uzupełnij zapis powstawania jonu z atomu. Podaj liczby protonów i elektronów wjonie.( ... / 2 p.)a) S ................. → S2–b) K ..................... → K+ liczba protonów: ........... Liczba protonów: ........... Liczba elektronów: .......... Liczba elektronów: ..........
Answers
Answer:
Only when a podaj is connected with equal terms with a wjonie.( .. / 2 p.a)a) S
Explanation:
hope this helps :)
To properly measure 20 ml of water, what must be at the 20 ml mark of the graduated cylinder?
Answers
To properly measure 20 ml of water, the 20 ml mark of the graduated cylinder must be at the meniscus.
We measure at the meniscus for what reason?
To have the "actual" volume be what is marked, the mark must be placed where the bottom of the meniscus should be on the glass. Therefore, by taking measurements from the bottom of the meniscus, you are harmonizing your measurement process with the method used to calibrate the markings on the glass in the first place.
The meniscus is what?
When a molecular substance (water, of course) comes into contact with another material, the surface forms a meniscus. You may imagine that happening with water when it adheres to the interior of a glass.
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which example has particles that can be drawn closer to occupy smaller volume
Answers
One example of particles that can be drawn closer to occupy a smaller volume is a gas.
Understanding Gaseous StateIn the gaseous state, particles have high kinetic energy and are not strongly attracted to each other. They move freely and randomly, colliding with each other and the container walls.
Since there are minimal intermolecular forces holding them together, gas particles can be compressed or drawn closer together by reducing the volume of the container.
By decreasing the volume of a gas, such as by compressing it in a cylinder or container, the particles have less space to move around. They collide with each other more frequently, increasing the frequency of intermolecular collisions. As a result, the gas particles are drawn closer together, and the overall volume occupied by the gas decreases.
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How many moles of FeCI3 are present in 345.0 g FeCI3
Answers
Answer:
\(\boxed {\boxed {\sf About \ 2.127 \ moles \ of \ FeCl_3}}\)
Explanation:
To convert from moles to grams, the molar mass must be used.
1. Find Molar Mass
The compound is iron (III) chloride: FeCl₃
First, find the molar masses of the individual elements in the compound: iron (Fe) and chlorine (Cl).
Fe: 55.84 g/molCl: 35.45 g/molThere are 3 atoms of chlorine, denoted by the subscript after Cl. Multiply the molar mass of chlorine by 3 and add iron's molar mass.
FeCl₃: 3(35.45 g/mol)+(55.84 g/mol)=162.19 g/molThis number tells us the grams of FeCl₃ in 1 mole.
2. Calculate Moles
Use the number as a ratio.
\(\frac{162.19 \ g \ FeCl_3}{1 \ mol \ FeCl_3}\)
Multiply by the given number of grams, 345.0.
\(345.0 \ g \ FeCl_3 *\frac{162.19 \ g \ FeCl_3}{1 \ mol \ FeCl_3}\)
Flip the fraction so the grams of FeCl₃ will cancel.
\(345.0 \ g \ FeCl_3 *\frac{1 \ mol \ FeCl_3}{162.19 \ g \ FeCl_3}\)
\(345.0 *\frac{1 \ mol \ FeCl_3}{162.19 }\)
\(\frac{345.0 \ mol \ FeCl_3}{162.19 }\)
Divide.
\(2.12713484 \ mol \ FeCl_3\)
3. Round
The original measurement of grams, 345.0, has 4 significant figures. We must round our answer to 4 sig figs.
For the answer we calculated, that is the thousandth place.
The 1 in the ten thousandth place tells us to leave the 7 in the thousandth place.
\(\approx 2.127 \ mol \ FeCl_3\)
There are about 2.127 moles of iron (III) chloride in 345.0 grams.
2. Unfortunately, the National Park System, which provides breathtaking tourist
destinations and major outdoor activities, has been dismantled. The NPS used to cover
85 million acres of land in the United States. In its place, Disneylands will be
constructed over this land, with its cost estimated to be $17.5 million for every 80
acres. What is the cost to replace the National Park System with Disneylands?
Answers
Answer:
Explanation:
these are really dark questions. would Disneyland really need 85 million acres of park? :DDD that seems like way way too much ground.
Anyway
85,000,000 / 80 = 1062500
17,500,000*1062500 = $18,593,750,000,000 or approx. 18.6 Trillion
why are ionic solids brittle
Answers
Answer:
-The ionic solids are hard and brittle because the ions in ionic solids are held in a lattice due to the electrostatic forces of attraction in cations and anions as well as the repulsion with the like charges. ... Because the ionic solids are localized, these solids tend to be stiff and brittle like covalent solids.
Explanation:
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16) Which of the following single-replacement reactions will result in NO REACTION?
A. Na(s) + Mg(NO3)2(aq)
B. Na(s) + Al(NO3)2(aq) ->
C. Na(s) + Cu(NO3)2(aq) ->>
D. Na(s) + Fe(NO3)2(aq) →>>
E. Na(s) + Ba(NO3)2(aq)
Answers
each of the following laboratory techniques can be used to separate an organic mixture except one. which one is the exception?
Answers
Filtration is the likely exception among these techniques for separating an organic mixture.
To identify the laboratory technique that is an exception and cannot be used to separate an organic mixture, we need to consider common separation methods used in organic chemistry. Here are some commonly used techniques for separating organic mixtures:
Distillation: This technique utilizes differences in boiling points to separate volatile components from a mixture.
Extraction: Involves the selective dissolution of one or more components in a suitable solvent.
Chromatography: Separates components based on their differential affinity to a stationary phase and a mobile phase.
Filtration: Uses a porous medium to separate solid particles from a liquid or gas.
Crystallization: Involves the formation of pure crystals from a saturated solution to separate a solid component.
The exception among these techniques is likely filtration. Filtration is primarily used to separate solid particles from a liquid or gas but may not be suitable for separating components in an organic mixture where all components are in a liquid or gas phase. Filtration is more commonly employed to separate solids from liquids or gases, rather than separating different liquid or gaseous components from each other.
Therefore, filtration is the likely exception among these techniques for separating an organic mixture.
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Balance the following chemical equation: H2+ 02 – H2O
Answers
Answer:
2H2 + O2 ⇒ 2H2O
Explanation:
In order to balance a chemical equation you need to make sure that the number of atoms on both sides of the equation are equal.
H2 + O2 = H2O
H = 2
O = 2
Products:
H = 2
O = 1
Change coefficient to 2:
H = 2 × 2 = 4
O = 1 × 2 = 2
H2 + O2 = 2H4O
H2 = 2H2 = 2 × 2 = 4
2H2 + O2 ⇒ 2H2O
Hope this helps.
HELP PLEASE❗️❗️‼️
An increase in temperature is an increase in.... ( there are two correct answers)
A.) Water molecules
B.) The melting point
C.) pressure
D.) Fun
Answers
Hope this helps!
what is the volume occupied by 4 grams of oxygen at room temperature
Answers
Answer:
volume of O2 = 3000cm³
Explanation:
no. of moles= mass of oxygen (g)/molar mass of oxygen(g/mol)
= 4/32
=0.125
volume of oxygen= no. of moles × 24000 cm³ (or 24dm³)
= 0.125 × 24000 cm³
=3000cm³ (or 3dm³)
Which salt is the most common found in ocean water?
magnesium
calcium carbonate
potassium
sodium chloride
Answers
Answer:
Sodium chloride
Explanation:
There are several salts in seawater, but the most abundant is ordinary table salt or sodium chloride (NaCl). Sodium chloride, like other salts, dissolves in water into its ions, so this is really a question about which ions are present in the greatest concentration. Sodium chloride dissociates into Na+ and Cl- ions.
Which characteristic describes mixtures?
They form new substances when combined.
They are made entirely of compounds.
They can be separated through physical means.
They are never immiscible.
Answers
A blueberry bush uses energy from the Sun to make carbohydrates. Which set of energy transformations BEST describe this process?
A.radiant energy → chemical energy → nuclear energy
B.radiant energy → nuclear energy → chemical energy
C.nuclear energy → radiant energy → chemical energy
D.nuclear energy → chemical energy → radiant energy
Answers
Fusion powers the sun. This creates nuclear energy, which then goes to earth in the form of radiation. The plants get sunlight and photosynthesise (the process of getting glucose by sunlight). The answer should be C.
In addition to dispersion forces, what intermolecular forces are present in a solution between methanol (ch30h ) and bromine (br2)? ( dipole-dipole dipole-induced dipole ion-dipole ion-induced dipole
Answers
In addition to dispersion forces, dipole-induced dipole intermolecular forces are present in a solution between methanol and bromine .
So , second option is correct one .
The intermolecular force of attraction are the electrostatic in nature and include van der waals forces and hydrogen bonds . Molecule in liquids are held to another molecules by intermolecular interaction , which are weaker than intramolecular interaction that hold atoms within molecules and polyatomic ions.
A liquid that evaporates at a slow rate exhibits strong intermolecular forces . This happens because the energy applied to the liquid would need more time to separate the molecules of a substance that are strongly attached.
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Question 14
1 pts
How many moles of NaCl could be found in 0.4 L of a 0.9 M solution? Round your answer to
two decimal places.
Answers
Answer:
0.36mol
Explanation:
Given parameters:
Volume of NaCl = 0.4L
Molarity = 0.9M
Unknown:
Number of moles = ?
Solution:
To find the number of moles, the molarity of a solution is the amount of solute contained in a solution.
Molarity = \(\frac{number of moles}{volume}\)
Number of moles = molarity x volume
Insert the parameters and solve;
Number of moles = 0.4 x 0.9 = 0.36mol
If I have 7.4 moles of gas at a pressure of 0.09 atm and at a temperature of 46C, what is the volume of the container that the gas is in?
Answers
Answer:
175.2 liters
Explanation:
the gas is in is 175.2 liters.
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answer this question no links
Answers
Answer:
it is b, a stethiscope is the thing they put on your heart
Explanation: