Answer:
whoa this question is long
Explanation:
how did u write it gosh
The electron configuration for Helium (He) is shown below.
1s2
Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?
Answer:
3rd image
Explanation:
Describe the nucleus of the
atom.
Answer:
The nucleus of atom is composed of two subatomic particles that each have charges.
Protons, which are positively charged particles.Neutrons, which are neutrally charged particles.Both reside in the nucleus of an atom. The amount of protons and neutrons (Electrons can to) is what helps us identify each atom apart. Electrons are NOT in the nucleus of atom but orbit it in outer layers called orbitals.
Do all particles pass right through the atoms undeflected?
AnswereYs
Explanatioynt:Yes
Some copper is palced in a previouly weighted crucible and reweighed .
Mass of crucible + copper = 5.92g
Mass of crucible = 4.65g
Clculate the mass of copper used in the experiment
We can find the mass of copper by finding the difference between the mass of the crucible and the copper, and just the crucible. This is possible since the mass that is left would be attributed to just the copper.
Mass of copper = (Mass of crucible + copper) - Mass of crucible
= 5.92 g - 4.65 g
= 1.27 g
How didMendeleev feel about Russian science education when he came back from Germany?
While he was researching and writing that book in the 1860s, Mendeleyev made the discovery that led to his most famous achievement. He noticed certain recurring patterns between different groups of elements and, using existing knowledge of the elements' chemical and physical properties, he was able to make further connections. He systematically arranged the dozens of known elements by atomic weight in a grid-like diagram; following this system, he could even predict the qualities of still-unknown elements. In 1869, Mendeleyev formally presented his discovery of the periodic law to the Russian Chemical Society.
Hope This is Ok :)
why does magnesium in an aqueous solution of magnesium chloride conduct electricity but solid magnesium chloride does not?
Answer:
Delocalized electrons
Explanation:
Magnesium Chloride is an ionic compound, so its lattice structure prevents the flow of electrons. However, when you convert the ionic compound into an aqueous solution it allows movement of electrons/ions due to the breakdown of the molecular forces which make it conductible. In short, Ionic compounds as a solid are not conductible but they are in an aqueous form.
What gas in our atmosphere is thought to have come from plants and algae alone?
Answer:
Oxegen
Explanation:
All that oxygen has to come from somewhere. You might already know that it comes from photosynthetic organisms like plants.
Carbon tetrachlordie (CCI4) is ___
A. iconic
B. Covalent
Answer:
b
Explanation:
Don't really understand the question
Answer:
Did they mean those diagrams are the salt or what?
.
Approximately now much energy will it take to
break all the bonds present in the molecule below?
Answer:
498 kj/mol
Explanation:
Chemical reactions occur as a result of bond breaking and bond formation.
The bonds in reactants are broken and atoms are rearranged to form new bonds.
During bond breaking energy is absorbed to break the bonds of reactants while bond formation involves the release of energy during the formation of new bonds.
In our case;
In 1 mole of the Oxygen molecule, there is one O=O bond
Energy absorbed to break O=O is 498 kJ/mol
Therefore, the ΔH required to break all the bonds in one mole of Oxygen(O₂) molecules is 498kJ/mol.
Note that, bond breaking is endothermic since energy is absorbed from the surroundings.
mark brainliest pls
I need help with this
Answer:
87 (whatever unit its using)
Element with the largest electron cloud
Out of the answer choices, rubidium has the highest energy valence shell. With a single electron in the fifth energy level, krypton will have the highest number of energy levels of the group I elements listed.
kasama na po jan ang explenation
balance CHCl3 + O2 = CO2 + H2O + Cl2
Answer:
2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2
Explanation:
Left Hand Side(LHS)
We have CHCl3 and O2
Right Hand Side(RHS)
We have CO2, H2O and Cl2
Balancing
To make sure that they have same values, put 2 before CHCl3 giving 2CHCl3 and 3 on Cl2(RHS) for chlorine gas giving 3Cl2
H2O remains the same
Before CO2 put 2 giving 2CO2
To make sure that oxygen is balanced put 5/2 before it. This gives 5/2 O2 (2 cancels out don't worry)
Combining all;
2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2
I hope this helps. Have a nice studies.
please help pick more then one answer!!!
Select all the correct answers.
How will the results of the Human Genome Project benefit the future of genetics? (Select all that apply.)
A. Scientists can develop better diagnostic methods for genetic diseases.
B. Scientists can successfully prevent the occurrence of genetic diseases in humans.
C. Scientists can prevent the process of human aging.
D. Scientists can compare the genomes of humans and other different organisms.
E. Scientists can produce organisms more superior than humans.
Answer: A. B.
Explanation:
What causes streams to form?
O absorption
O precipitation
O glaciers
O lakes
Answer: essay the answer is B: precipitation
Explanation:
carbon reduction process is not applied for extraction of alkali metal . why ?
Answer:
The alkali metals are the highly electropositive metals. Highly electropositive metals cannot be extraction carbon reduction process, because these metals do not react with carbon
Explanation:
Question
How are chemical equations balanced?
Answer:
According to the law of conservation of mass, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants. A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side
write True If the statement Is Correct And False If Not
Answer:
11.false12.true13.true14.false15.true16.false17.false18.false19.true20.false21.PC22.CC23.PC24.CC25.CCExplanation:
I think it is helps youI need help with this question please
1-propanol is the correct answer.
How many different types of atoms are in the formula Ba(OH)2 • 8H2O?
A)3
B)2
C)11
D)22
a brief description of atoms and how they relate to
molecules and compounds
Answer:
Explanation:
Atoms are the thing that make up molecules and compounds. Molecules contain two or more atoms and are held together by covalent bonds
An unknown element X forms a compound with chlorine: XCL2. Predict the chemical formula of the compound that element X makes with oxygen. Justify your answer.
How might a molecule have a very strong molecular dipole?
Answer:
When you make the electronegativities of A(Positive partial charge) and C (Negative Partial charge) less and have B with a strong electronegativity to create a very strong molecular dipole. ... Both molecules possess strong molecular dipoles.
Calculate the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy.
Q = mcΔT
The specific heat of water is 4.18 J/g°C.
Taking into account the definition of calorimetry, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body can receive or give up without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gaseous) does not change. Since the molecular structure does not change, a change in temperature is observed.
In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= 1800 J c= 4.18 [tex]\frac{J}{gC}[/tex] m= 5 g ΔT= ?Replacing in the expression to calculate heat exchanges:
1800 J= 4.18[tex]\frac{J}{gC}[/tex]× 5 g× ΔT
Solving:
1800 J ÷ (4.18[tex]\frac{J}{gC}[/tex]× 5 g)= ΔT
ΔT= 86.12 C
In summary, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
Learn more:
brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultsWhat can you say about the reactants of photosynthesis and the products of cellular respiration?
Answer:
The reactants of cellular respiration are oxygen and sugar, which are the products of photosynthesis
Explanation:
how long does it take to rehydrate after being dehydrated
Answer:
up to 120 minutes to digest water and rehydrate your body
One of the few resources on Mars is
Answer:
iron .. titanium.. nickel....aluminum... sulfur... and calcium
Suppose that you experimentally determine the molar extinction coefficient (ε) of a complex ion sample to be 8171 L/mol-cm at 510 nm. The literature value for the ε of the complex ion sample is reported as 8400 L/mol-cm. What is the percent purity of your experimental sample
The percent purity of your experimental sample is 97.3 %
The percentage purity % = impure value/pure value × 100 %.
Actual value of molar extinction coefficient = impure value = 8171 L/mol-cm, pure value = literature value = 8400 L/mol-cm.
Substituting the values of the variables into the equation, we have
% purity = 8171 L/mol-cm/8400 L/mol-cm × 100 %
% purity = 0.9727 × 100 %
% purity = 97.27 %
% purity ≅ 97.3 %
The percent purity of your experimental sample is 97.3 %
Learn more about percentage purity here:
https://brainly.com/question/17836636
Please help I will give brainliest ;3
Answer:
oxygen, carbondioxide
carbondioxide, oxygen
can anyone tell me "what are the exceptions of law of reciprocal proportions??"