Answer:
some example includes:
gold, copper, oxygen, chlorine, diamond
Explanation:
What is phase change? How does matter change in phase?
Answer ASAP pls :(
Answer:
when the chemical composition of a substance change and it is not reversible it is called phase change.for example: turning milk in to yogurt
What could be a reason for the difference between the theoretical and experimental heats of reaction
Answer:
Theoretical value is the value a scientist expects from an equation, assuming perfect or near-perfect conditions. Experimental value, on the other hand, is what is actually measured from an experiment. Rarely (in fact never) are these numbers the same.
Take the area of a sheet of paper. I know that the area of a rectangle can be found by multiplying the lengths of both sides together. I can assume an 8.5x11 sheet, so I calculate exactly 93.5 square inches. This is my theoretical value. When I actually do the measurements on my paper, it turns out my paper has been slightly cut on one end, or I’m measuring with a shoddy ruler. Therefore, I might measure only 92.8 square inches. This is my experimental value. See thats it’s close, but not exact.
Expanding on this concept, quantum mechanics is so widely accepted in the scientific community because many theoretical values calculated by mathmaticians concurred with experimental values to many, many decimal places. These would be constants such as Plank’s Constant, energy levels of harmonic potentials, and energy levels of the hydrogen atom.
Explanation:
Theoretical result is based on information and mathematics. Trials or experiments are the foundation of experimental result. What ought to occur is theoretical probability. What actually occurs is experimental probability.
What is difference between theoretical and experimental result ?The definition of theoretical probability. It is not necessary to do the experiment and then analyze the findings for theoretical probability. The theoretical probability, however, represents what you anticipate will occur in an experimnet.
In experimental probability, information is gathered via repeated experimentation. In theoretical probability, data is gathered without doing the experiment by taking into account every possibility that has a chance of occurring.
Thus, difference between the theoretical and experimental heats of reaction the incomplete combustion may result in the formation of carbon and carbon monoxide instead of carbon dioxide and water.
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When electricity runs through an electric stove, what other type of energy is produced?
A.
heat energy
B.
sound energy
C.
chemical energy
D.
mechanical energy
define pure substance
I'm horrible at Chem plse help! Determine whether the reaction given below would be spontaneous or not. JUSTIFY your answer.
Mg2+ (aq) + Ag (s) → Ag+ (aq) + Mg (s)
Thank you
Answer:
This is a not a spontaneous reaction.
Explanation:
No, it would not be one because if you add the reactants the products would have to be the same (same types of atoms. number of atoms, and the arrangement of the atoms). In this case the reactants and the products are not equal.
A 13. 00 g sample of citric acid reacts with an excess of baking soda as shown in the equation. Upper H Subscript 3 Baseline Upper C Subscript 8 Baseline Upper H Subscript 5 Baseline Upper O Subscript 7 Baseline 3 Upper N a Upper H Upper C Upper O Subscript 3 Baseline right arrow 3 Upper C Upper O Subscript 2 Baseline 3 Upper H Subscript 2 Baseline Upper O Upper N a Subscript 3 Baseline Upper C Subscript 8 Baseline Upper H Subscript 5 Baseline Upper O Subscript 7. What is the theoretical yield of carbon dioxide? 0. 993 g 2. 98 g 3. 65 g 8. 93 g.
Answer:
The answer is C.
Explanation:
i got a 100 on the test
The theoretical yield of carbon dioxide, CO₂ obtained from the reaction is 8.93 g
We'll begin by calculating the mass of citric acid, H₃C₆H₅O₇ that reacted and the mass of carbon dioxide, CO₂ produced from the balanced equation.
H₃C₆H₅O₇ + 3NaHCO₃ —> 3CO₂ + 3H₂O + Na₃C₆H₅O₇
Molar mass of H₃C₆H₅O₇ = (3×1) + (12×6) + (5×1) + (7×16) = 192 g/mol
Mass of H₃C₆H₅O₇ from the balanced equation = 1 × 192 = 192 g
Molar mass of CO₂ = 12 + (2 × 16) = 44 g/mol
Mass of CO₂ from the balanced equation = 3 × 44 = 132 g
From the balanced equation above,
192 g of H₃C₆H₅O₇ reacted to produce 132 g of CO₂
Finally, we shall determine the theoretical yield of CO₂. This can be obtained as follow:
From the balanced equation above,
192 g of H₃C₆H₅O₇ reacted to produce 132 g of CO₂.
Therefore,
13 g of H₃C₆H₅O₇ will react to produce = (13 × 132) / 192 = 8.93 g of CO₂.
Thus, the theoretical yield of CO₂ is 8.93 g
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The pathogen below is a single-celled organism without a nucleus that can cause illness in a humans.
Answer:
bacteria
Explanation:
The pathogen below is a single-celled organism without a nucleus that can cause illness in a humans.
Atoms: SC.8.P.8.7
Match the definition to proper definition:
Term:
Definition:
1. Atoms
A.Positive subatomic particles found in the
nucleus of the atom
2. Neutron
B. Negative subatomic particle found in the cloud
3. Proton
C. Substance that has no electrical charge
4. Nucleus
D. Basic building block of all matter
5. Electron cloud
E. Substance that consists of only one type of ato,
6. Electrons
F. Center of an atom with a positive charge
G. Outside of the atom with a negative charge
7. Element
Answer:
1 = D
2 = C
3 = A
4 = F
5 = G
6 = B
7 = E
please help me with this question as it's really important
Answer:
(i)
A → CH3CH2CH3 ( Propane )
B → CH3CH(Cl)CH3 ( 2-Chloropropane )
C → No product
D→ CH3CH=CH2 ( 2-propene )
E → CH3CH2COOH ( Propanoic acid )
(ii)
Reagent X → Acidified water [ H+ / H2O ]
Reagent Y → Bromine with Carbon tetrachloride [ Br2 / CCl4 ]
Reagent Z → Sodium hydroxide [NaOH]
A wave is moving towards shore with a velocity of 5.0 MS if it’s frequency is 2.5 Herz what is the wave length
Answer:
2 mExplanation:
The wavelength of a wave can be found by using the formula
[tex]\lambda = \frac{c}{f} \\[/tex]
where
c is the speed of the wave
f is the frequency
From the question
c = 5 m/s
f = 2.5 Hz
We have
[tex] \lambda = \frac{5}{2.5} = 2 \\ [/tex]
We have the final answer as
2 mHope this helps you
the chemical and mechanical processes of food breakdown are called ________.
Answer:
digestion
Explanation:
hii what the procedures of making organic fertilizer and its precautions. can u answer it i kinda need it now
Answer:
Go through your kitchen waste. Vegetables and fruit peelings are the number one food remnants you should keep aside. ...
Add other organic materials to the compost. ...
Collect some garden waste. ...
Create the compost. ...
Apply the fertilizer.
Answer:
AbstractOrganic fertilizers are an essential source for plant nutrients and a soil conditioner in agriculture. Due to its sources and the composition of the organic inputs as well as the type, functionality and failures of the applied treatment process, the organic fertilizer may contain various amounts of infectious agents and toxic chemicals, especially the antibiotics that can be introduced to the subsequent food chain. A range of human and animal pathogens of bacterial, viral and parasitic origin have been the cause of food-borne epidemics due to unintended contamination from organic fertilizers. The use of antibiotics by humans and in animal feeds will also end up in the organic fertilizers. These antibiotics and other chemicals, depending on the sources of the organics, will enhance the likelihood of occurrence of resistant and multi-resistant strains of microorganisms in society and have been reported to cause ecotoxicological environmental effects and disruption of the ecological balance. Exposure of microorganisms to sublethal concentration of antibiotics in the organic products induces antibiotic resistance. WHO guidelines for the reuse of excreta and other organic matters identify the risk for the exposed groups to the reuse of the
Explanation:
will give 80 points: Use the word bank to fill in the rock cycle steps in the diagram below. You many only use each word 1 time. 2 of the words will not be used at all
Word Bank:
Erosion, Heat and Pressure, Crust, Metamorphic Rock, Magma, Sedimentary Rock, Igneous Rock, Compaction, Melting, Earth
Filling the rock cycle steps with the world Bank is as follows;
1 = Erosion1 = Erosion2 = Compaction1 = Erosion2 = Compaction3 = Sedimentary rock1 = Erosion2 = Compaction3 = Sedimentary rock4 = Heat and Pressure1 = Erosion2 = Compaction3 = Sedimentary rock4 = Heat and Pressure5 = Metamorphic rock1 = Erosion2 = Compaction3 = Sedimentary rock4 = Heat and Pressure5 = Metamorphic rock6 = Melting1 = Erosion2 = Compaction3 = Sedimentary rock4 = Heat and Pressure5 = Metamorphic rock6 = Melting7 = Magma1 = Erosion2 = Compaction3 = Sedimentary rock4 = Heat and Pressure5 = Metamorphic rock6 = Melting7 = Magma8 = Igneous rock.Additionally, the conversion of igneous, Sedimentary and metamorphous rock to sediments happens by a process termed Erosion/Weathering.
Also, conversion of magma to igneous rock is by cooling and vice versa is by heating.
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In your own words, what is the conservation of mass?
Answer:
In chemistry, the law of conservation of mass states that the mass of the products (the chemical substances created by a chemical reaction) will always equal the mass of the reactants (the substances that make the chemical reaction). Think of it as being similar to balancing an algebraic equation.
Explanation:
(winks and runs off)
Answer:
Mass cannot be created or destroyed.
Explanation:
Conservation of mass is "a principle stating that mass cannot be created or destroyed" (Oxford Languages).
Have a nice day! (there is not much rewording/etc you can do here as it is a simple principle, but I hope this will still help!)
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
answer this step by step pls
Answer:
neutrons = mass number - atomic number
. = 39-19 =20
How do catalysts generally affect chemical reactions? A They increase the temperature of the system. B They increase the surface area of the reactants. C They increase the activation energy by introducing enzymes. D They lower the activation energy by providing an alternate pathway.
Answer:
D
Explanation:
A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy without itself being consumed by the reaction.
Activation energy is the minimum amount of energy required for a chemical reaction to proceed in the forward direction.
A catalyst increases the reaction rate by providing an alternative pathway or mechanism for the reaction
The difference between Physical/Chemical properties and Physical/Chemical changes
Physical changes can be reversed and chemical changes can’t be reversed. A physical property is a characteristic which can be identified without changing the substance but to identify a chemical property, you do have to change the substance.
In the image above, the region labeled “ A “ is called the . . .
White matter
Dorsal Horn
Central Canal
Ventral Root
Answer:
Ans B)=====> Dorsal Horn
Two arms, each known as a Dorsal Horn, are formed by the core grey matter at the back of the spinal cord. In the image, the region labeled “ A “ is called the Dorsal Horn. Therefore, option B is correct.
What is dorsal horn ?One of the gray longitudinal columns discovered inside the spinal cord is the dorsal horn. Through the dorsal roots of the spinal nerves, it predominantly serves as the end of primary afferent fibers.
A complex network of excitatory and inhibitory interneurons, as well as projection neurons, make up the dorsal horn, which serves as an intermediary processing center for this information. It transmits the processed somatosensory information from the spinal cord to the brain.
The cell bodies of sensory neurons are located in the dorsal horns. The ventral horns are two arms of central grey matter that are found at the front of the spinal cord.
Thus, option B is correct.
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[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Question~}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Solve this question ~
Find the Hybridization of N in compound " NH3 " and determine its shape ~
Let's check Electronic configuration of N in ground state
[tex]\\ \sf\longmapsto 1s^22s^22p^3[/tex]
In exited state[tex]\\ \sf\longmapsto 1s^22s^22px^12py^12pz^2[/tex]
3 p orbitalsIn hydrogen case
[tex]\\ \sf\longmapsto 1s^1[/tex]
1 s orbitalHence Hybridization
[tex]\\ \sf\longmapsto s-p-p-p[/tex]
[tex]\\ \sf\longmapsto sp^3[/tex]
Structure is tetrahedral .
Spare way:-
Bond pairs==3=>Bonding electrons=6Lone pair=1=>Anti bonding electrons=2Hybridization
[tex]\\ \sf\longmapsto \dfrac{1}{2}[\sigma+\sigma *][/tex]
[tex]\\ \sf\longmapsto \dfrac{1}{2}[6+2][/tex]
[tex]\\ \sf\longmapsto \dfrac{1}{2}[8][/tex]
[tex]\\ \sf\longmapsto 4[/tex]
sp3 HybridizationShape-Tetrahedral .are most of the elements on the periodic table classified as a metal or a non-metal?
Answer:
Metals
Explanation:
There are more metals next time trying checking the table they will be in colored squares to count to see which has more! HOPE THIS HELPED!
<3 :D
Hurry i only have till today to finsh this!
Instructions: For this lab, use the Energy Skate Park Basics simulation and the lab report to record your information. You will submit your completed lab report.
Answer:
With the friction on, the minimum height I can place the skater so that he makes it all the way around the loop is 6 meters. This is about a meter higher than if the friction were turned off. The “lost” energy is going towards thermal energy. This means in real life that heat is being created due to the friction.
Explanation:
Answer:
With the friction on, the minimum height I can place the skater so that he makes it all the way around the loop is 6 meters. This is about a meter higher than if the friction were turned off. The “lost” energy is going towards thermal energy. This means in real life that heat is being created due to the friction.
Explanation:
Which of the following typically increases the rate of a chemical reaction? А avoiding the use of a catalyst B heating the reaction C increasing the volume of the reaction vessel D decreasing the concentration of the reactants
B: heating the reaction
hope i could help :D
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this is the text code sir
Answer:
okay?
Explanation:
Answer:
[tex]\huge\blue{\boxed{\tt{\colorbox{black}{babyheaven}}}}[/tex]
what is the accepted iupac name for the compound mg3p2?
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the IUPAC name of the Mg[tex]_3[/tex]P[tex]_2[/tex] is Tri magnesium Di phosphide.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. The IUPAC name of the Mg[tex]_3[/tex]P[tex]_2[/tex] is Tri magnesium Di phosphide. The oxidation state of phosphide is -3.
Therefore, the IUPAC name of the Mg[tex]_3[/tex]P[tex]_2[/tex] is Tri magnesium Di phosphide.
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Excited hydrogen atoms emit light in the ultraviolet at 2.47x1015Hz. What is the
energy of a single photon with this frequency?
The energy of a single photon of this frequency is 1.638 × 10⁻¹⁸ J
Using Planck's equation, the energy of the photon E = hf where h = Planck's constant = 6.63 × 10⁻³⁴ Js and f = frequency of ultraviolet light = 2.47 × 10⁻¹⁵ Hz.
Substituting the values of the variables into the equation, we have
E = hf
E = 6.63 × 10⁻³⁴ Js × 2.47 × 10¹⁵ Hz.
E = 16.3761 × 10⁻¹⁹ J
E = 1.63761 × 10⁻¹⁸ J
E ≅ 1.638 × 10⁻¹⁸ J
So, the energy of a single photon of this frequency is 1.638 × 10⁻¹⁸ J
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9. The “power plant” of the cell is the
(a) nucleus.
(b) ribosome.
(c) chloroplast.
(d) mitochondria.
Answer:
D. Mitochondria
Explanation:
The mitochondria, labeled the powerhouse of the cell, are the organelle responsible for energy production within the cell
HURRY
What type of reaction is this? 2H2 + O2=>2H 20 + Energy
A. Exothermic reaction
B. Endothermic reaction
C. Chemical reaction
D. Nuclear reaction
Answer: Both A and C
Explanation:
It is a combustion reaction that is exothermic. It is a chemical reaction. Choices A and C are both correct, so I'm not certain what criteria are most important in answering.
How do I convert 50 years into seconds. Express your answer in scientific notation?
Answer: 15768 seconds
Explanation: (50 years) x (365 da/yr) x (86,400 sec/da)
= (50 x 365 x 86,400) seconds
= 1.5768 x 10⁹ seconds
Which over lappings are present in carbon(iv)oxide molecule
Answer:
the double carbon to oxygen bond
Segments of DNA found in chromosomes are called ——— ?
Answer:
Physically, a gene is a segment (or segments) of a chromosome. Functionally, a gene can play many different roles within a cell.
Explanation: