The following phrases best describe this reaction : A Endothermic, absorbing energy
Further explanationDelta H reaction (ΔH) is the amount of heat change between the system and its environment
(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)
∆H positive (endothermic): energy (heat) is absorbed from the environment to the system
∆H negative (exothermic): energy (heat) released from the system to the environment
Reaction
H₂O(g) + energy ⇒ H₂(g) + 1/2O₂(g)
In this reaction, it is shown that to break the bonds on the H₂O molecule to form H₂ and O₂ molecules will require energy (breaking the bonds requires energy)
This energy is usually called ∆H dissociation⁰
Jessica is holding a ball. What happens when she lets go of the ball as a result of forces acting on it?
What is another name for a row on the periodic table?
Answer choices :
Group
Period
Family
Transition Metals
How does an organism express a dominant trait?
Answer:
An organism will always express a dominant trait in the offspring if the dominant allele is present, even if there is only one copy
Explanation:
Hope this helps u:)
Most of the elements on the Periodic Table are metals.
True
False
Answer:
the answer is true
Explanation:
I hope so it is helpful to u
The identity of the element shown in the model above is determined by the number of -
Answer:
The number of protons or electrons in its atomic structure
Explanation:
Elements are substances which constitute the building block of matter. The smallest particles of elements that can ever exist are known as atoms. Atoms of different elements are different in their structure properties. This difference is due to to the number of sub-atomic particles present in the atom of each element.
The three sub-atomicparticles are protons, neutrons and electrons. Protons and neutrons are present in the nucleus of an atom, while the electrons revolve around the nucleus in orbits. The identity of each element is determined by the number of protons present in the atomic nucleus of that element. This is known as the atomic number of that element. For neutral atoms, the proton number is equal to electron number.
For the given element, the electron and proton number are respectively 4, therefore, the atomic number of the element is 4. The element with atomic number 4 is Beryllium.
Criminalist Julie Sandel is investigating a series of threatening notes written in pencil and sent to a local politician. A suspect is arrested and Julie directs the suspect to prepare writing samples to compare to the writing on the notes. She has the suspect sit at a desk in an empty office and gives him a pen and a piece of paper. She begins to read one of the notes and asks the suspect to write the words she dictates. After reading about half a page, she stops, then dictates the same part of the note a second time for the suspect. At one point, the suspect indicates that he does not know how to spell one of the words, so Julie spells it for him. After completing the task, Julie takes the origi- nal notes and the dictated writing from the suspect to a document examiner. What mistakes, if any, did Julie make?
Answer:
See explanation
Explanation:
Julie Sandel, the Criminalist made several mistakes in handling this investigation. They include;
It is true that handwriting can be deduced by comparing a suspects's handwriting to the questioned document, however Julie made a mistake by not making the suspect to write many pages. The suspect may intentionally decide to change his/her hand writing. This trick can be neutralized by asking the suspect to write several pages.
Secondly, the suspect ought to have been given a pencil and paper similar to the one used to write the threatening document. Rather, Julie gave the suspect a pen.
Thirdly, the suspect only wrote half a page instead of a full page. Secondly, Julie took only two exemplars when she should have taken more.
She should not have dictated the spelling of any word to the suspect. The examiner is not supposed to do that.
The threatening documents should have first been shown to the document examiner before taking the exemplars.
What causes metal atoms to form metallic bonds?
Answer:
Metallic bond, force that holds atoms together in a metallic substance. ... The atoms that the electrons leave behind become positive ions, and the interaction between such ions and valence electrons gives rise to the cohesive or binding force that holds the metallic crystal together.
Explanation:
how many dots would a dot diagram for selenium, one of the group 16 elements, have?
Answer:
Because selenium is in the 16th column on the periodic chart, it has 6 valence electrons. Thus, the Lewis structure (or electron dot structure) for selenium has 6 dots around it.
It will look similar to this without the underscores:
__.
. Se:
_. .
Explanation:
The Lewis structure (or electron dot structure) for selenium has 6 dots around it.
What is an electron dot structure?Electron dot diagrams are diagrams in which the valence electrons of an atom are shown as dots distributed around the element's symbol.
Selenium is in the 16th column on the periodic chart, it has 6 valence electrons. Thus, the Lewis structure (or electron dot structure) for selenium has 6 dots around it.
Learn more about electron dot structure here:
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I would really appreciated if someone can help !!
A student calculated that 15 grams of his product were supposed to be produced. After completing the experiment, he actually
collected 11 grams of product. What is his percent yield?
a 73%
b 7.3%
c 14%
d 140%
Which of the following transports electricity between objects in a circuit?
Battery
Light bulb
Switch
Wire
Answer:
Wire.
Explanation:
The wire has movable electrons, which moves the charge and the electricity around.
Battery provides the electricity by electrical potential energy, not transport it.
The switch toggles between an open circuit and a closed one, where only the closed one has a full loop of wire to transport electricity.
And the light bulb uses electricity.
Hope this helped!
What type of reaction does each of the following equations represent?
A. Single replacement
B. Double replacement
C. Decomposition
Answer:
Option C. Decomposition
Explanation:
To know which option is correct, it is important we know what is a single displacement reaction, double displacement reaction and decomposition reaction.
A Single displacement reaction can be defined as a reaction in which a single element is replaced by another element in a compound.
A double displacement reaction is a reaction involving the exchange of ions of two parts of ionic compounds to form two different compounds.
A decomposition reaction is a reaction in which a compound splits into two or more simpler compound or element.
Bearing the above definitions in mind and considering the question given above, we can conclude that the reaction given in the question above is a decomposition reaction since the compound (NH₄OH) splits into two different compound (NH₃ and H₂O)
Which element is depicted from this orbital diagram? A NA N 3p 35 Increasing Energy A NA A 2p 2s 11 1s O Fluorine O Chlorine O Neon Argon
Answer:
Explanation:
neon
what is formula for Bromine?
Br2
I looked it up and it said that Bromine's formula is Br2
Answer:Br2
Explanation:
The elements on the Periodic Table of the Elements are arranged in order of increasing
Answer: The Atomic Number increases. Hope this helps!!!
Explanation:
Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass.
Answer:
The Atomic number increases....
Explanation:
Duh
Which of the following does NOT agree with the Law of Conservation of Mass?
A. Mass can be destroyed.
B. Matter cannot be created.
C. Mass prior to chemical change is the same as mass after chemical change.
mass prior to chemival change is. thesame as mass after chemical change
Predict the precipitate that will be formed in the following reaction:
NaF(aq) + AgNO3(aq) →
The precipitate that will be formed : AgF
Further explanationOne indication of the double displacement reaction is the precipitation reaction
Solubility Rules:
• 1. soluble compound
All compounds of Li +, Na +, K +, Rb +, Cs +, and NH4 +
All compounds of NO₃⁻ and C₂H₃O₂⁻
Compounds of Cl−, Br−, I− except Ag⁺, Hg₂²⁺, Pb²⁺
Compounds of SO₄²⁻ except for Hg₂²⁺, Pb²⁺, Sr²⁺, Ba²⁺
• 2. insoluble compounds
Compounds of CO₃²⁻ and PO₄³⁻ except for Compounds of Li +, Na +, K +, Rb +, Cs +, and NH₄ +
Compounds of OH− except Compounds of Li +, Na +, K +, Rb +, Cs +, NH₄⁺, Sr²⁺, and Ba²⁺
Reaction
NaF(aq) + AgNO₃(aq) →NaNO₃(aq)+ AgF(s)
From the solubility rules above, it has been shown that the salts of the Ag⁺ cations are insoluble salts
I need help please #4
Answer:
The first one??
Explanation:
1. 2KCIO3, -- 2KCI + 302
How many moles of O2 will be produced from 2.25 moles of KCIO3?
Answer:
3.375moles of O₂
Explanation:
The reaction expression is given as;
2KClO₃ → 2KCl + 3O₂
Number of moles of KClO₃ = 2.25moles
Now;
To find the number of moles of O₂ produced we use known number of moles.
So;
2 mole of KClO₃ will produce 3 moles of O₂
2.25moles of KClO₃ will produce [tex]\frac{2.25 x 3}{2}[/tex] = 3.375moles of O₂
true or false: Some fungi are unicellular and some fungi are multicellular
Answer:
True
Explanation:
What is the name of the following chemical compound?
Answer: Dinitrogen pentoxide
Explanation:
Answer:
Dinitrogen Pentoxide
Explanation:
A population of snails lives in a large field. As the size of the population grows, individual organisms on one side of the field stop mating with individuals from the opposite side. Which of the following statements is true?
Over time, genetic differences between individual snails will increase.
Over time, genetic differences between individual snails will decrease.
The snail population will eventually split in two and evolve side by side in cospeciation.
This is an example of an increase in gene flow.
Answer:
I believe that the answer is c
Explanation:
The snails will split hope this helps! <3
Answer:
A. Over time, genetic differences between individual snails will increase.
Explanation:
Which element could provide one atom to make an ionic bond with fluorine
At STP, 1 liter of O (g) and 1 liter of Ne(g) have the same (1) Mass (2) Density (3) Number of molecules (4) Number of atoms I
The world's largest importer of fish products is:
A. Japan
B. China
C. United States
D. Norway
PLEASE GICE ME THE RIGHT ANSWER MY GRADES ARE BADDDD
Answer:
A. Japan
Explanation:
Answer:
japan xd
Explanation:
Matching: Which is involved in making energy for the cell?
A. cell membrane
B. nucleus
C. endoplasmic reticulum
D. mitochondria
E. cell wall
F. ribosomes
A.
B.
C.
D.
E.
F.
Answer:
D. Mitochondria
Explanation:
This is the one that makes the energy that powers the cell, aka, the powerhouse.
A Lewis structure is a two-dimensional representation of a molecule that does not necessarily show what shape that molecule would take in three dimensions. From the given Lewis structure and what you know about VSEPR theory, identify the shape of the molecule. A molecule with atom Y single bonded with 2 X substituents. The Y atom has two lone pairs.
Answer:
Orbital geometry is Tetrahedral
Molecular geometry is Bent/V shape
Explanation:
Using the VSEPR theory which states that
The shape of a molecule depends upon the number of valence shell electron pairs (bonded or nonbonded) around the central atom. Pairs of electrons in the valence shell repel one another since their electron clouds are negatively charged. These pairs of electrons tend to occupy such positions in space that minimize repulsion and thus maximize distance between them. The valence shell is taken as a sphere with the electron pairs localizing on the spherical surface at maximum distance from one another. A multiple bond is treated as if it is a single electron pair and the two or three electron pairs of a multiple bond are treated as a single super pair. Where two or more resonance structures can represent a molecule, the VSEPR model is applicable to any such structureso we have Y as the central atom and it has 2X substituents on its either sides with two lone pairs on Y. This is a case of Y which has
2 bonds with X on either sides
2 lone pairs on Y
The orbital geometry will be Tetrahedral but its Molecular geometry will be Bent/V shaped
The formula of the compound will be YX2
Water with chemical Formula of H2O bears the same features.
The shape of the given molecule according to the VSEPR theory has been Bent/V shape.
VSEPR theory has been the Valence Shell Electron Pair Repulsion theory. It helps in the determination of the molecular and geometrical shape based on the presence of the atoms attached.
The given molecule has the presence of 2 single-bonded X atoms.
The atoms repel each other, while the presence of loan pairs results in the force for the molecule to occupy the tetrahedral orbital geometry. The repulsion from the loan pair to the X atoms acquires the Bent V shape as molecular geometry.
For more information about the VSEPR theory, refer to the link:
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How long would it take a current of 10A to deposit 6.36g of copper during the electrolysis of copper (ll) tetraoxosulphate VI solution. (Cu = 63.5,1F=96500C)
Cu2+ + 2e- Cu
It take 0.54 hours to deposit 6.36g of copper
Further explanationFaraday's Law I
"The mass of the substance formed at each electrode is proportional to the electric current flowing in the electrolysis
W = e.i.t / 96500
[tex]\tt \large {\boxed {\bold {W \: = \: \dfrac {e \times i \: x \: t} {96500}}}}[/tex]
e = equivalent = Ar / valence
i = current, A
t = time, s
W=6.36 g
e = 63.5 : 2 =31.75
i = 10 A
[tex]\tt t=\dfrac{W\times 96500}{e.i}\\\\t=\dfrac{6.36\times 96500}{31.75\times 10 }\\\\t=1933.04~s\approx 0.54~hours[/tex]
Yes its flocab but...HELPPPPPP(science)
Answer:
dense
Explanation:
Answer: dense
Explanation:
Which observations is the best evidence that unknown liquid X is a composed of only pure substance
Answer:
A substance that is composed only of atoms having the same atomic number is ... 36 grams of an unknown liquid at its boiling point,.
6CO2 + 6H20 --> C6H12O6 + 602
What is the total number of grams of water needed to make 6.2 moles of CoH1206?
79.5 g
402.9
670.2 g
381.2 g