Answer:
15.2L at STP
Explanation:
Given reaction expression;
CaCO₃ → CaO + CO₂
Number of moles of CaCO₃ = 0.68mol
Unknown:
Volume of CO₂ produced at STP = ?
Solution:
To solve this problem, we must first find the number of moles CO₂ produced,
1 mole of CaCO₃ will produce 1 mole of CO₂
0.68mole of CaCO₃ will produce 0.68mole of CO₂ at STP
Now;
1 mole of gas occupies a volume of 22.4L at STP;
0.68mole of CO₂ will then occupy 0.68 x 22.4 = 15.2L at STP
What would be my conclusion for the question How much salt will it take to make an egg float.
Answer:
adding 3 tbsp. of salt should be about enough to make the egg float.
Explanation:
The density of the average egg will be slightly greater than that of water, so it will sink. To make the egg float, we have to make the water more dense by adding salt. For 1 cup of water.
A geologist is making observations from atop a small mountain. She sees two parallel faults: one directly to the east and one directly to the west. She concludes that these faults are caused by tension stretching the crust. From what type of land feature is the geologist making her observations? plateau anticline syncline fault-block mountain
Answer: fault-block mountain
Explanation:
I got it right on edgen 2020
Answer:
d fault-block mountain
Explanation:
How has atomic theory changed since Dalton wrote his postulates?
Select one:
a. Atomic theory has not changed.
b. We have discovered that atoms are made up of smaller particles, called subatomic particles.
c. We have discovered that atoms of one element can change into atoms of another element through chemical reactions.
d. We have discovered that air is not made of atoms.
Answer:
The correct answer is - option b. We have discovered that atoms are made up of smaller particles, called subatomic particles.
Explanation:
Dalton made various postulates related to the atom which is an atomic theory that was first try to describe all properties of atoms. The major part of this atomic theory is that the atoms are unit that makes all the matter which is indivisible.
This postulate of the atomic theory is incorrect and changed as atoms are not indivisible and can divide into subatomic particles (proton, neutron and electron) however atoms are the unit that involves in reaction.
The way in which the atomic theory changed since John Dalton wrote his postulates is that: B. We have discovered that atoms are made up of smaller particles, called subatomic particles.
An atom can be defined as the smallest, indivisible, fundamental unit of matter that forms all chemical elements. Thus, it is the fundamental (basic) building blocks of matter.
The first model of an atom was proposed by a notable English chemist called John Dalton. In the early 1800s, John Dalton adopted Democritus' theory to formulate the first model of an atom.
Dalton's atomic theory postulated that the atom of a chemical element as an impenetrable, indivisible, very small (tiny) but movable hard sphere i.e it cannot be divided into subatomic particles.
However, it has been established by other atomic model that an atom comprises three subatomic particles such as:
ProtonsElectronsNeutronsRead more on atoms here: https://brainly.com/question/377844
Which of the following statements about photosynthesis is true?
A. Plants release CO2 into the atmosphere.
B. Plants take in CO2, then use the carbon (C) to make sugar.
C. Plants only do photosynthesis when they are hungry.
D. None of the above
A. Stamens (p) The portion of the pistil receiving the pollen
B. Filament (q) The female structure of a flower
C. Pistil (r) The stalk of an anther
D. Stigma (s) The male part of a flower
D. Stigma (s) The male part of a flower
1-A→(s); B→(r); C→(q); D→(p)
2-A→(s); B→(q); C→(r); D→(p)
3-A→(r); B→(s); C→(p); D→(q)
4-A→(q); B→(r); C→(s); D→(p)
answer please 30pts
Answer:
(A) A-(S) ; B-(R) ; C-(Q) ; D-(P).
Explanation:
(A)-S_ The male part of a flower.
(B)-R _The stalk of an anther.
(C)-Q_ The female structure of a flower.
(D)-P _The portion of the pistil recieving the pollen.
Someone please help!!
Balances these redox equations
Cr2O7^2-(aq)+ I-(aq)-> Cr^3+(aq)+ I2(s)
Which organelle provides a protective covering to the cell and controls what enters and leaves?
Cell Membrane. Has multiple proteins between it that allow certain things in and out. I think.
Neutrons released in a fission reaction can strike other nuclei and cause
Answer:
Chain reaction
Explanation:
Select all that apply.
How would you compare Venus's rotation to Earth's rotation?
Venus's rotation is backward compared to Earth's.
Venus's rotation is the opposite compared to Earth's.
Venus's rotation is retrograde compared to Earth's.
Venus's rotation is the same compared to Earth's.
I need answers ASAP
Answer:
backward, opposite, retrograde
Explanation:
why, i just got it right when i put that.
Answer:
here they are
Explanation:
Venus's rotation is backward compared to Earth's.
Venus's rotation is the opposite compared to Earth's.
Venus's rotation is retrograde compared to Earth's.
How do you understand electrons and the periodic table? I am lost.
Answer:
Explanation:
Electron configurations and the periodic table. Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.
What are “condensation nuclei”?
Answer:
Cloud condensation nuclei or CCNs are small particles typically 0.2 µm, or 1/100 the size of a cloud droplet on which water vapor condenses. Water requires a non-gaseous surface to make the transition from a vapour to a liquid; this process is called condensation.
Given 8.55 g of butanoic acid and excess ethanol, how many grams of ethyl butyrate would be synthesized, assuming a complete 100% yield?
Answer: Amount of ethyl butyrate formed = 11.3 g
Explanation: The reaction between butanoic acid (C3H7COOH) and excess ethanol (C2H5OH) is:
Since ethanol is the excess reagent, the formation of the product i.e. ethyl butyrate is influenced by the amount of butanoic acid present
Based on the reaction stoichiometry:
1 mole of butanoic acid produces 1 mole of ethyl butyrate
Mass of butanoic acid = 8.50 g
Molar mass of butanoic acid = 88 g/mol
Moles of ethyl butyrate = 0.097
Molar mass of ethyl butyrate= 116 g/mol
brainless, please
Grams of ethyl butyrate produced : 11.27 g
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
The reaction between Butanoic acid-C₄H₈O₂ and an excess Ethanol-C₂H₅OH to produce ethyl butyrate-C₆H₁₂O₂ :
C₄H₈O₂+C₂H₅OH⇒C₆H₁₂O₂+H₂O
mass Butanoic acid- C₄H₈O₂= 8.55 g, so mol C₄H₈O₂ (MW=88,11 g/mol) :
[tex]\tt \dfrac{8.55}{88.11}=0.097[/tex]
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%[/tex]
For 100% yield ⇒ actual=theoretical
Because Ethanol as an excess, so Butanoic acid as a limiting reactant and mol Ethyl butyrate based on mol Butanoic acid
From equation, mol ratio of mol C₆H₁₂O₂ : mol C₄H₈O₂ = 1 : 1, so : mol C₆H₁₂O₂=mol C₄H₈O₂= 0.097
mass C₆H₁₂O₂(MW=116.16 g/mol)
[tex]\tt 0.097\times 116,16 g/mol=11.27~g[/tex]
Why is fractional distillation not used to produce drinking water from sea water?
Answer:
Please mark me brainliest. the answer is
Explanation:
The problem is that the desalination of water requires a lot of energy. Salt dissolves very easily in water, forming strong chemical bonds, and those bonds are difficult to break. Energy and the technology to desalinate water are both expensive, and this means that desalinating water can be pretty costly.
Fractional distillation not used to produce drinking water from sea water Because single step distillation process is enough to purify sea water.
What is Fractional Distillation ?The separation of a liquid mixture into fractions differing in boiling point (and hence chemical composition) by means of distillation, typically using a fractionating column.
We don’t need fractional distillation but single step distillation to purify seawater.
Fractional distillation is most commonly used to separate various volatile organics out of crude oil as the fractions of the crude have different uses.
Removing water from a solution is a single step process we can easily do at home.
Hence,Fractional distillation not used to produce drinking water from sea water Because single step distillation process is enough to purify sea water.
Learn more about Distillation here ;
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Prokaryotic cells and Eukaryotic cells both contain all 4 biomolecules. True or False
The electron that is located in the outermost shell of the octet rule.
Answer:
im not sure what answer you're looking for here, their called valence electrons if thats what you're looking for.
Explanation:
Which phrase best describes the particles in a solid?
a. sliding around
b. very far apart
c. closely packed
d.completely still
Answer:
C
The particles in solid are closely packed which prevent it from changing its shape
The phrase that best describes the particles in a solid is closely packed.
SOLIDS:
Matter is any substance that has mass and occupies space. It can exist in three states namely: solid, liquid and gas.Solids as a state of matter contains particles that are closely packed together and hence, appear compact in shape. The force of attraction that holds the particles of a solid together are firm. Therefore, phrase that best describes the particles in a solid is closely packed.Learn more at: https://brainly.com/question/17061172?referrer=searchResults
What organisms are not able to photosynthesize?
A. Grasses
B. Rabbits
C. Algae
D. Some bacteris
Answer:
B. Rabbits
For photosynthesis you need chlorophyll but rabbits don't have it.
i need help on question 3 true or false thxxx quick i’m timed
Answer:
The answer is true.
explain why solid sodium chloride does not conduct electricity
Answer:
It does not contain free mobile ions
Explanation:
Solid sodium chloride does not conduct electricity because it does not contain free mobile ions.
Although sodium chloride is an ionic compound, in solid state, there is absence of free mobile ions. In aqueous solutions or in molten form, ionic compounds can conduct an electric current using free mobile ions as carriers. Therefore, they are electrolytes.In solid state ions are arranged into crystal lattice and will not conduct a current of electricity.
What is the Molarity of volumetric flask 1
What is the Molarity of volumetric flask 2
The Molarity of volumetric flask 1 : 1.26 M
The Molarity of volumetric flask 2 : 0.06 M
Further explanationDilution is a process of decreasing the concentration of a solution by adding a number of solvents
Can be formulated
M₁V₁=M₂V₂
M₁ = Initial Molarity
V₁ = Initial volume
M₂ = Final Molarity (after dilution)
V₂ = Final volume (after dilution)
Volume of volumetric flask = 500 ml
flask 1[tex]\tt M_1.V_1=M_2V_2\\\\9\times 0.07=M_2.0.5\rightarrow M_2=1.26[/tex]
flask 2[tex]\tt M_1.V_1=M_2V_2\\\\1.26\times 0.023=M_2\times 0.5\rightarrow M_2=0.06[/tex]
What is the concentration of H3O+ ions in saliva if [OH-] = 4.22 x 10-10 M? Provide the pH and the classification of this sample of saliva.
pH=4.625
The classification of this sample of saliva : acid
Further explanationThe water equilibrium constant (Kw) is the product of concentration
the ions:
Kw = [H₃O⁺] [OH⁻]
Kw value at 25° C = 10⁻¹⁴
It is known [OH-] = 4.22 x 10⁻¹⁰ M
then the concentration of H₃O⁺:
[tex]\tt 10^{-14}=4.22\times 10^{-10}\times [H_3O^+]\\\\(H_3O^+]=\dfrac{10^{-14}}{4.22\times 10^{-10}}=2.37\times 10^{-5}[/tex]
pH=-log[H₃O⁺][tex]\tt pH=5-log~2.37=4.625[/tex]
Saliva⇒acid(pH<7)
A chemical change always involves...
A. a color change
B. a change in shape
C. the state of matter changing
D. a new substance forming
SOMEONE PLEASE ANSWER
How many grams are in 15.6 moles of Barium Chloride?
How many molecules are in 156.0g of Iron (II) Sulfate?
How many moles are in 123.0g of Lithium Carbonate?
Convert 1.8 moles of Ca to number of atoms.
How many atoms are in 12.3 moles of Lithium
Answer:You can view more details on each measurement unit: molecular weight of BaCl2 or grams This compound is also known as Barium Chloride. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles BaCl2, or 208.233 grams.
Explanation:
Which of the following landforms (physical features) was formed when two landmasses collided?
Hawaiian Islands
Mariana Trench
Himalayan Mountains
HELP ME NOW ASAP PLEASE, 10 POINTS HURRY
The chemical equation below shows the reaction of methane (CH4) and oxygen gas (O2) to form carbon dioxide (CO2) and water (H2O).
CH4 + 2O2 → CO2 + 2H2O
In this equation, which of the following are products?
Answer:
CO2 + 2H2O
Explanation:
left side of the equation is the products side, right side is the reactant side
Answer:
Carbon Dioxide(CO2) and Water (H2O)
Explanation:
Whatever is on the right side of the equation is the products, the left side is the reactants.
What type of kinetic energy is a rainbow?
How many orbitals in iron are half-filled, that is, have only one electron?
(A) 1
(B) 2
(C) 3
(D) 4
Answer:
B.
Explanation:
1 orbital is 4 half of 4 is 2.
Which element has four energy levels?
cesium (Cs)
rubidium (Rb)
potassium (K)
sodium (Na)
Answer:
Potassium (K)
Explanation:
Out of the four options, Potassium is the only one to fill a total of 4 energy levels.
Both Cesium (Cs) and Rubidium (Rb) fill more than three energy levels, with Cesium filling 6 and Rubidium filling 5.
Sodium (Na) only fills 3 energy levels.
Thus, that leaves Potassium (K), which has 4 energy levels.
Hope this helped ^-^
Help Me Just One Question Okay
What occurs when cells breakdown food to release energy?
A.Respiration
B.Photosynthesis
Answer:
respiration
Explanation:
respiration means break down of food for production of energy
photosynthesis is the process by which plants produce there own food