Answer:
PCl₅ = 208.22g/mol. UF₆ = 352.03g/mol.
Explanation:
Find the atomic mass of each element–and if there's a subscript (you multiply the atomic mass by that much). P= 30.97g, Cl= 35.45g; 30.97+35.45(5) = 208.22g [same idea with UF₆]
determine the number of charged particles in nucleus of calcium atom then deduce the number of electrons
NUCLEAR CHARGE (20+)
ATOMIC MASS (40 amu)
given the relative charge of a proton =1+\ m1nucleon=1amu
Answer:
detail is given below.
Explanation:
The charged particles of nucleus are protons while neutrons are neutral having no charge.
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus.
Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons.
one proton contribute 1 amu to the total weight. There are 20 protons and 20 neutrons in Ca thus its atomic mass is 40 amu.
While the atomic number is 20.
The more variation in a species, the less likely the chance that species has of surviving. true or false
Answer:
The more variation in a species, the less likely the chance that species has of surviving. false
Explanation:
As species have heritable variation the species produce more offsprings that can survive and offsprings within a favorable variation are more likely to survive and reproduce. Hence favorable variation makes the species diverse and more in population. Thus greater are the chances of survival, a decrease in diversity will lead to a decline in variability, and fewer chances of survival.Complete this sentence. If mass remains the same while the volume of a substance ________, the density of the substance will_______________.
(NOT GIVING BRAINLIEST, JUST ANSWERING A QUESTION MOST PEOPLE GOT WRONG ON)
A. decreases, decrease
B. increases, decrease
C. increases, stay the same
D. decreases, stay the same
**It's D**
Answer:
B. Increases, Decreases
Explanation:
I majored in Chemistry
A 1.25 g sample of aluminum is reacted with 3.28 g of copper (II) sulfate. What is the limiting reactant?
2Al(s) + 3CuSO4(aq) = Al2(SO4)3(aq) + 3Cu(s)
Select one:
a. Copper
b. Aluminum sulfate
c. Aluminum
d. Copper (II) sulfate
Answer:
d. Copper (II) sulfate
Explanation:
Given data:
Mass of Al = 1.25 g
Mass of CuSO₄ = 3.28 g
What is limiting reactant = ?
Solution:
Chemical equation:
2Al + 3CuSO₄ → Al₂ (SO₄)₃ + 3Cu
Number of moles of Al:
Number of moles = mass/molar mass
Number of moles = 1.25 g/ 27 g/mol
Number of moles = 0.05 mol
Number of moles of CuSO₄:
Number of moles = mass/molar mass
Number of moles = 3.28 g/ 159.6 g/mol
Number of moles = 0.02 mol
now we will compare the moles of reactant with product.
Al : Al₂ (SO₄)₃
2 : 1
0.05 : 1/2×0.05=0.025 mol
Al : Cu
2 : 3
0.05 : 3/2×0.05 = 0.075 mol
CuSO₄ : Al₂ (SO₄)₃
3 : 1
0.02 : 1/3×0.02=0.007 mol
CuSO₄ : Cu
3 : 3
0.02 : 0.02
Less number of moles of reactants are produced by CuSO₄ thus it will act as limiting reactant.
In any chemical process, the matter is neither lost nor gained. *
reaction
conservation of matter
covalent bonds
physical change
In any chemical process, the matter is neither lost nor gained according to conservation of matter. Therefore, the correct option is option B.
What is matter?Matter is any material that has weight and occupies space by having volume in classical physics as well as general chemistry. All common items that can be felt are ultimately constituted of atoms, which are composed of colliding subatomic particles, therefore "matter" typically comprises atoms and everything made up of them, as well as any particles that act as if they both rest weight and volume.
It does not, however, contain massless particles like photons or even other energy phenomena and waves like light or heat. There are numerous states of matter (also known as phases). In any chemical process, the matter is neither lost nor gained according to conservation of matter.
Therefore, the correct option is option B.
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How would life be different if there were 10 hours in a day
Answer:
If there was only 10 hours in a day, including the night time it would be complexly new environment. Say you are up for 7 hours and sleep 3, in those 7 hours you would go to work for probably 4 hours, come home and do stuff for 3 then go to bed and do it all over again.
What is this called? it might be sideways but it show look like a Y
Answer:
I'm thinking it might be Element 39: Yttrium, as this is Chemistry.
Explanation:
The number placed in front of a compound to balance a chemical reaction is called?
Answer:
coefficients
Explanation:
good luck
Which particle has no mass and no charge?
O alpha
O beta
gamma
O
neutron
Answer:
Neutrons
Explanation:
How do water currents transfer heat different part of the ocean?
Answer:
Energy in the ocean and the atmosphere
Explanation:
Hope this helps!
i need help asap plzz first person to answer i will mark brainliest
Diagram 1
What type of air mass was already present A?
What type of air mass is coming in B ?
What type of front is indicated by the purple arrow?
What weather change is occurring because of this front?
Answer:
it's both cold and hot weather so it could form a tornado
You are eating dinner with your familiy one night. Your little brother (Who is a disgusting monster ) asked if you likes "seafood?" When you said yes, He proceeded to show you his chewed up, or "See Food". Did a chemical reaction take place, yes or no? What evidence or lack of evidence do you have to support your answer?
Answer:
yes eating the food involves both physical and chemical changes. The chewing of food is a physical change, while the mixing of saliva with food triggers chemical reactions
Explanation:
Once the food mixes with the saliva in our mouth, chemical reactions start taking place in the food, leading to its breakdown and changes in its chemical composition. An evidence of the chemical changes is the taste that we feel when we eat something sweet or sour etc.
Answer:
a chechimal
Explanation:
(Pls help i will give brainlyest) Label the missing parts of the diagram.
Answer:
Sedimentary rock
Metamorphic rock Igneous rock
"Indicate in each whether the following electron configurations correspond to an atom in its ground state, excited state, or is impossible."
a. [tex]{1s}^{2} {2s}^{2} {2p}^{4} [/tex]
b. [tex] {1s}^{2} {2s}^{2} {2p}^{3} {2d}^{1} [/tex]
c. [tex] {1s}^{2} {2s}^{2} {2p}^{3}{3s}^{1} [/tex]
d. [tex] {1s}^{2} {2s}^{1} {2p}^{2} [/tex]
e. [tex] {1s}^{2} {2s}^{2} {2p}^{1} [/tex]
f. [tex] {1s}^{2} {2s}^{3} [/tex]
Please, I really need help. I don't know what to do...
Answer:
Explanation:
Firstly, let's define what ground and excited state electronic configuration.
Ground state electronic configuration is when the electrons of the atom are in there lowest possible energy level while excited state electronic configuration is when electron(s) have moved to a higher energy level. Examples of these are provided in the options
a. 1s²2s²2p⁴ - This is a ground state electronic configuration (of oxygen) because the electrons are in there lowest possible energy level.
b. This option is not displaying (it is displaying something like an image that isn't loading)
c. 1s²2s²2p³3s¹ - We can see from this that an electron jumped from 2p energy level to 3s (p energy level ought to be completely filled with 6 electrons before another electron moves to the next energy level) meaning the electron is in it's excited state thus this is an excited state electronic configuration (of oxygen).
d. 1s²2s¹2p² - We can see from this also that an electron jumped from the 2s energy level to the 2p energy level (making it 2p² instead of 2p¹ in the ground state). The 2s energy level should ordinarily have 2 electrons. Thus, this is an excited state electronic configuration (of boron).
e. 1s²2s²sp¹ - This is a ground state electronic configuration (of boron) since all the electrons are in there lowest possible energy level.
f. 1s²2s³ - This configuration is impossible because the s energy level should only contain a maximum of 2 electrons, thus impossible to have 3 electrons in the s energy level
Ratan started business with cash Rs 50000
Answer:
what's the question here then ?????
Explanation:
nepal ????
Does anyone know what Yttrium(II) Dichromate's formula would look like?
Answer:
YCr2O7
Explanation:
Observe Record the appearance (colors,
textures, etc.) of the reactants in the data table.
How many reactants are there?
DONE
Answer:
1
Explanation:
By observing the appearance (colors, textures, etc.) of the reactants in the data one reactant is there.
What is reactant?A reactant is a substance or can say a chemical compound that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products.
For example we take a reaction-
O₂(g) + H₂(g) → H₂O(g)
Here, O₂ and H₂ are the reactants and H₂O is the product.
A reactant is present 100% initially and after sometimes it reduces gradually to form product according to chemical kinetics.
Given, the picture shown and the colour and texture of the reactant is shown.
Therefore, By observing the appearance (colors, textures, etc.) of the reactants in the data one reactant is there.
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Which human activity can have the greatest positive effect on global climate change by helping to reduce the amount of carbon dioxide in the atmosphere
Answer:
C. Limiting internal combustion engines that power automobiles.
Explanation:
I majored in Chemistry
What is the bond order for a single covalent bond?
Answer:
We typically represent covalent bonds with a dash ( - ) between the atoms. This indicates a single bond. Ex: Cl - Cl
Single bond, double bond, triple bond.
Explanation:
We call it a single covalent bond because the atoms are sharing a single pair of electrons.
Answer: If you have this question: The bond order for a single covalent bond is ____.
Then the answer is oneExplanation:
What molecules tend to have high kinetic energy and low intermolecular forces.
Answer: Two factors determine whether a substance is a solid, a liquid, or a gas: The kinetic energies of the particles (atoms, molecules, or ions) that make up a substance. Kinetic energy tends to keep the particles moving apart. The attractive intermolecular forces between particles that tend to draw the particles together. As the temperature continues to drop, the matter forms a solid. Due to the solid's low kinetic energy, particles have no "time" to move around, the particles have more "time" to be attracted. Therefore, solids have the strongest intramolecular forces (because they have the strongest attraction). The three states of matter are: Solids: The strong bonds between molecules make solids rigid and very difficult to deform. Liquids: The relatively weak bonds between molecules allow liquids to be deformed without effort.
Hope this helps.......... Stay safe and have a Merry Christmas!!!!!! :D
which is a greater threat to a mountain ecosystem: a beetle that kills coniferous trees or a wolf thats hunts and eats deer?
Answer:
Explanation:
The mountain ecosystems are characterized by coniferous tree species such as pinus, firs, and spruces and species such as deers, bears, and wolves.
A beetle that kills coniferous trees would be a greater threat to the ecosystem than a wolf that hunts and eat deer because the dominant trees in the ecosystem are conifers. Hence, a beetle that kills coniferous trees might end up killing the dominant tree species in the ecosystem and this will gravely affect other plant and animal species within the ecosystem.
Wolves and deers have their niche in the mountain ecosystem already and hence, their populations are naturally limited by limiting factors of the environment. Hence, a wolf that hunts and eats deers would be of a lesser threat to the mountain ecosystem.
On a roller coaster, where is maximum kinetic energy I’ll mark the brainiest.
Answer:
its the pink one I think
Explanation:
Answer: At the bottom of a big hill
Can someone help please
Answer:
d. cells are made of atoms and molecules. :)
Explanation:
hope i helped
separation methods for coconut oil and water
Answer:
[tex]\huge\mathtt{{\colorbox{silver}{ANSWER~~~↴}}}[/tex]
we use a separating funnel to separate oil from water , we are using funnel because both water and oil both are immiscible liquids.
the process of separation of oil from water is called filtration ✔️
no copied answer :)
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What is the only force that acts on a falling body when it is in free fall?
Answer:
Gravity
Explanation:
Objects that are experiencing free fall, are not encountering a significant force of air resistance or as a matter of fact any other kind of forces, they are falling under the complete control of gravity.
AB + energy→ A +B
23.
The general equation shown is a reaction that is an
a. exothermic decomposition
b. endothermic decomposition
c. endothermic synthesis
d. exothermic synthesis
Answer:
b. endothermic decomposition
Explanation:
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
A + B → AB
Endothermic reactions:
The type of reactions in which energy is absorbed are called endothermic reactions.
In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.
For example:
C + H₂O + 131 kj/mol → CO + H₂
Thus, in given reaction energy is added and AB compound is decomposed to give A and B so this reaction is endothermic decomposition.
How is a scientific law different from other laws in society?
O A. A scientific law is a rule about how to treat and punish people.
B. A scientific law describes what always happens under specific conditions in nature. O C. A scientific law serves to protect people, property, and nature from harm.
O D. A scientific law is what scientists have decided should be forced to happen in nature.
Answer:
The answer will be A
Explanation:
A scientific law is based on repeated experiments or observations, that describe or predict a range of natural phenomena. A scientific law is something that is unexpected
Answer:
B
Explanation:
It just is.......
What is the molecule that formed between B and F?
Answer:
BF3
Explanation:
For this question, you need to use the number of valence electrons present in each element. Boron is in group 3/13 on the periodic table so you know it has 3 valence electrons while Fluorine is in group 7/17 so it has 7 valence electrons. These elements are both covalent so they will share electrons. All elements in the first three rows want to reach either have 8 valence electrons or zero valence electrons depending on whichever is easier. When B and F interact each Fluorine will only want to take one electron, but Boron wants to get rid of all 3 electrons, so it will bond with 3 Fluorine to get rid of all its valence electrons.
I hope this helps.
What causes these H-bonds to form?
Answer: It is caused by the tendency of some atoms in molecules to attract electrons more than their accompanying atom.
The following compounds will
decompose on heating except
A Ag2CO3.
B. CaCO3.
C. K2CO3
D. PbCO.
E. ZnCO3
AnsThe option C is correct