Answer:
Explanation:
5
how do I calculate the density
What is the electron configuration of a ground-state Nb2+ ion? Select one: a. 1s22s22p63s23p64s23d104p65s24d1 b. 1s22s22p63s23p64s23d104p64d3 c. 1s22s22p63s23p64s23d104p65s14d2 d. 1s22s22p63s23p64s23d104p64d5 e. 1s22s22p63s23p64s23d104p65s24d3
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the electronic configuration of Nb²⁺ is [Kr]4d³.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The systematic distribution of electrons in the various atomic orbitals is called its electronic configuration. The atomic number of Nb is 41. The electronic configuration of Nb is [Kr] 4d⁴ 5s¹. The electronic configuration of Nb²⁺ is [Kr]4d³. Nb²⁺ also has an odd number of valence electrons. The superscripts represents the number of electrons in each orbitals.
Therefore, the electronic configuration of Nb²⁺ is [Kr]4d³.
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If you have 250mL of an 11M solution and add enough water to dilute it to 7 M, then what is the final volume of the solution?
please help balance
_NH4NO3=_N2+O2+H2O
Answer:
2NH4NO3 = 2N2 + O2 + 4H2O
Explanation:
What happens to the particles of a solid when the solid changes into a liquid? (5 points) a They increase in size. b They decrease in size. c The attractive force between them increases. d The attractive force between them decreases.
Help I got only 15 minutes left
Answer:
90g
Explanation:
I hope this helps plz give brainliest ! :D
Consider this reaction.
What volume of oxygen gas, in milliliters, is required to react with 0.640 g of SO2 gas at STP?
11.2 mL
22.4 mL
112 mL
224 mL
Answer:
The correct answer is C 112
Explanation:
I just took the test good luck :)
Answer:
I think it is 112
If air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body _______
Answer:
Mechanical energy
Explanation:
Given that,
Potential energy of an object is given by :
P = mgh
The kinetic energy of an object is given by :
[tex]K=\dfrac{1}{2}mv^2[/tex]
Where
m is mass
h is height
v is velocity of the object
The sum of potential and kinetic energy is equal to total energy or the mechanical energy.
Hence, if air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body is equal to mechanical energy.
Which of the following are physical properties?
Radioactivity
Color
Temperature
Flammability
Texture
Reactivity
Answer:
Explanation:
The properties that are observed or measured without changing the composition of matter are called physical properties.
color, Temperature, Texture are the physical properties as the composition of matter remains the same.
On the other hand, Radioactivity, Flammability and Reactivity comes under chemical property as during the chemical reactions there might be some changes in the properties.
Which is the balanced half-reaction equation for the reduction of Al3+ to Al?
1. A13+ + 3e - Al
2. A13+ - Al + 3e
3. Al + 3e - A13+
4. Al - A13+ + 3e
Answer:
1. Al³⁺ + 3e⁻ → Al
Explanation:
In a reduction, the oxidation number of a species is converted to a lower value.
In the following half-reaction:
Al³⁺ + 3e⁻ → AlThe number of atoms is the same on both sides of the equation (one Al atom). The electrical charge is also the same, as there is a total charge of 0 on both sides.
A reaction that is considered fast is likely to have which of the following characteristics?
A) A high activation energy
B) A high temperature
C) A low collision frequency
D) Reactants in low concentrations
Answer:
I believe it's either a or b but I'm pretty sure that it's a
which has a lower freezing point oxygen or ethonal
Answer:
Ethanol
Explanation:
Study the reaction.
2AgNO3 (aq)+Cu (s)→Cu(NO3)2 (aq)+2Ag (s)
If the oxidation number of copper changes from 0 to +2, is this a redox reaction?
-No; copper gained 2 electrons and was reduced.
-Yes; copper lost 2 electrons and was oxidized.
-Yes, the products have 2 fewer electrons than the reactants.
-No, the products have as many electrons as the reactants.
Answer: If the oxidation number of copper changes from 0 to +2 then yes this is a redox reaction as copper lost 2 electrons and was oxidized.
Explanation:
When an element or atoms loses an electron then it acquires a positive charge.
This charge on an atom represents its oxidation state.
For example, [tex]2AgNO_{3}(aq) + Cu(s) \rightarrow Cu(NO_{3})_{2}(aq) + 2Ag(s)[/tex]
Here, oxidation number of copper changes from 0 to +2.
A redox reaction in which electrons are removed from an atom or a reaction where an increase in oxidation number of an atom takes place is called oxidation-half reaction. The atom itself gets oxidized.
This means that here copper lost 2 electrons and was oxidized.
Thus, we can conclude that if the oxidation number of copper changes from 0 to +2 then yes this is a redox reaction as copper lost 2 electrons and was oxidized.
If 2 carbon atoms, underwent fusion. What element would you get?
Answer:
Two Helium atoms
If two carbon atoms underwent fusion (of 600 million kelvin) you would get two helium atoms.
solid iron with copper (II) sulfate. Assume the iron will form a +2 charge on the product side. Write the balanced equation for this reaction
Answer:
hey here is the answer to your question.
Explanation:
1) Write a balanced equation for the reaction occurring. (*Iron occurs in a few different oxidation states, but I will assume we're referring to Fe(II) or Fe2+)
Fe + CuSO4 -> Cu + FeSO4
2) Calculate the number of moles of each reactant.
Fe: 1.924 g * (1 mol / 55.85 g) = 0.03455 mol Fe
CuSO4: 0.1363 L * (0.0750 mol / 1 L) = 0.01022 mol CuSO4
3) Determine the limiting reactant. Because we have fewer moles of copper(II) sulfate and are reacting both reactants in a 1:1 ratio, we will run out of copper(II) sulfate first, making it the limiting reactant.
4) Convert moles of the limiting reactant to moles and grams of product of interest.
0.01022 CuSO4 (1 mol Cu / 1 mol CuSO4 ) (63.55 g Cu / 1 mol Cu) = 0.6495 g Cu
What type of element did fermi expect to find when uranium absorbed a neutron and then ejected a beta particle? what did they find ( they were identified by someone else much later.) what reason did fermi and his group give for not being able to identify the products? answer?
Answer: a)neptunium b) the element is unstable
Explanation:
a) 238 0 239 -1
U + n = Np e
92 1 93 0
b) it is an isotope of neptunium with half-lives less than 4.5 days, with most less than 50 minutes. It is therefore not stable that's why they where unable to identify it
If you want to make 8.00 moles of AlF₃ how many moles of F₂ will you need, using the following balanced chemical equation? 2 Al + 3 F₂ → 2 AlF₃
Answer:
You will need 12.0 moles of F₂
Explanation:
Based on the chemical equation, 2 moles of AlF₃ are produced when 3 moles of F₂ are added in an excess of Al.
Using this expression: 2mol AlF₃ = 3mol F₂ we can find the moles of F₂ as follows:
8.00 mol AlF₃ * (3mol F₂ / 2mol AlF₃) =
You will need 12.0 moles of F₂A new chemistry teacher arrives in her new room and discovers that the room was left in total chaos by her predecessor. While organizing the room, she finds a box on a shelf in the prep room labeled "Electrochemistry demonstration". The box contains some metal strips, and a solution in a bottle. The metal is labeled "Metal E" and the solution is labeled "1 M nitrate salt of E". In an attempt to organize the activity, she looks throughout the room for similar samples. She manages to find samples of metals and their nitrate solutions labeled A, B, C and D in addition to the original sample. In a file cabinet, she finds a paper labeled "Electrochemistry Activity" which lists five metals: zinc, aluminum, magnesium, silver and tin She is not able to find anything that identifies which metals correspond to which letters. She makes some quick observations, summarized below.
Answer:
D in addition to the original sample. In a file cabinet, she finds a paper labeled "Electrochemistry Activity" which lists five metals: zinc, aluminum, magnesium, silver and tin She is not able to find anything that identifies which metals correspond to which letters. She makes some quick observations, summarized below.
Explanation:
The reaction between solid aluminum and liquid bromine is exothermic. This reaction creates
the product aluminum bromide.
What equation includes the correct formulas and demonstrates conservation of mass?
A Al(s) + Br2(1) - AlBr3(s)
B Al(s) + Br(l) - AlBr(s)
C Al(s) + 3Br(1) - AlBr3(s)
D
2Al(s) + 3Br2(1) - 2AlBr3(s)
Answer:
correct answer is d)
Explanation:
This answer demonstrates law of conservation of mass because the mass of the products is equal to the mass of reactants with the help of the coefficients which is the process known as balancing. This answer also includes the correct formulas, as Br is a gas so it MUST be written as Br2. hope this helps:)
2Al(s) + 3Br2(1) - 2AlBr3(s) is the correct formulas and demonstrates conservation of mass.
What is Conservation of Mass?Every action has an equal and opposite response, states Newton's Third Law. This indicates that any force applied to an item will have an equal and opposite-directed response force of the same magnitude. A force pair is the collective name for these connected forces.
Each individual object will have a different force pair with each other object in systems of numerous objects where all things interact. In the case of charged particles, the charge of each object will dictate the direction of each force in the force pair.
Similar charges will cause particles to repel one another by directing their forces away from one another. With their forces pointing in the same direction, particles with opposing charges attract one another.
Therefore, 2Al(s) + 3Br2(1) - 2AlBr3(s) is the correct formulas and demonstrates conservation of mass.
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Which is a process that involves collecting information and ideas that are supported by belief or opinion?
science
systematics
pseudoscience
hypothesis
Answer:
The answer is C
Explanation:
I did it on edge
which of the following is an indicator of a chemical reaction?
A. changing states of matter(solid/liquid)
B. increasing in temperature.
C. two different compounds mixing and remaining separate.
D. decreasing in size.
Answer:
B
Explanation:
B is the best showing of a chemical reaction out of the choices
Answer:
it is all except C
Explanation:
a chemical reaction occurs when 2 substances completely mix together and they do not remain separate
Please help I beg this is going to determine my grade for the end of the year so please what ever you do please help me and my grade
Answer:
there's nothing in the picture or post
Answer:
There doesn't appear to be a question here.
Explanation:
you might need to reupload this with the question
Describe Electrovalent bond.
Answer:
The chemical bond formed by the transfer of electrons from the valence shell of one tom to the valence shell of another atom is called electrovalent bond or ionic bond ad the valency is electrovalency. The compounds which are formed as a result of lectrovalent bonding are called electrovalent compounds or ionic compounds.
Explanation:
ectrovalent bond is formed between two atoms in which one atom belongs to a etal while the other to a non-metal. The metal atom loses its valance electron to tain stable electronic configuration and gains positive ion or cation. On the other nd, the non-metal atom gains electrons from the metal to form stable negative ion anion. The atom of an element which has less than 4 electrons in its valence shell has tendency to lose electrons whereas the atom which has more than 4 electrons in its lance shell has a tendency to gain electrons to attain the inert gas configuration. As a sult, these atoms acquire electrical charges; called ions. Usually metal atoms lose ectron (s) and gain positively charged whereas non-metal atoms usually gains electron and acquires a negative charge. These two oppositely charge ions i.e. cation and mion are bonded together by the force of attraction to form the ionic bond.
Answer:
the chemical which transfer elements totally
What would be the pressure, in atm, exerted by 3.2 moles of oxygen with a volume of 12.3 liters and a temperature of 294 K?
Answer:
6.3 atm
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesIdeal Gas Law
Ideal Gas Law Formula: PV = nRT
P is pressure (in atm)V is volume (in L)n is number of molesR is gas constant (0.0821 L · atm · mol⁻¹ · K⁻¹)T is temperature (in K)Explanation:
Step 1: Define
Identify variables
[Given] n = 3.2 mol O₂
[Given] V = 12.3 L
[Given] T = 294 K
[Solve] P
Step 2: Solve for P
Substitute in variables [Ideal Gas Law Formula]: P(12.3 L) = (3.2 mol)(0.0821 L · atm · mol⁻¹ · K⁻¹)(294 K)Multiply [Cancel out units]: P(12.3 L) = 77.2397 L · atmIsolate P [Cancel out units]: P = 6.27965 atmStep 3: Check
Follow sig figs and round. We are given 2 sig figs as our lowest.
6.27965 atm ≈ 6.3 atm
What characteristic of the light is affected by the amplitude of the light
wave
(A) color
(B) brightness
Answer:
I think B but I'm not sure.
Answer: Amplitude of the light wave impacts brightness; the wavelength is what impacts/is associated with color.
Molecules are large atoms true or false
Answer:
False
Explanation:
Molecules are not more sizable atoms than the average atom. Molecules are compunds of two different symbolic elements, when you combine then you get a molecule. The answer to your question is false because if they were larger molecules, they would be in object around us but molecules are not in all objects around us.
How many Joules are needed to raise 29.4g of aluminum from 32.0°C to 92.0°C? (The specific heat of aluminum is 0.900J/g °C)
Type your answer....
Answer:
1,587.6
Explanation:
You use 92-32 =60
Then 60*29.4*0.9
You will get the answer
Single Replacement Reactions:
AI+CU(CIO3)2----->
Ag+Li3PO4----->
Answer:
2Al + 3Cu(ClO3)2 → 2Al(ClO3)3 + 3Cu and
3Ag + Li3PO4 → Ag3PO4 + 3Li
Explanation:
In single repacement reactions, one element is substituted for another to produce a different compound. In the problem, the cation is exchange and the elements produced are:
Al(ClO3)3 and Ag3PO4.
The reactions are:
2Al + 3Cu(ClO3)2 → 2Al(ClO3)3 + 3CuAnd:
3Ag + Li3PO4 → Ag3PO4 + 3Li
7. List all of the variables that you controlled or kept the same.
Salt water
Answer:
Temperature is a common type of controlled variable. If a temperature is held constant during an experiment, it is controlled. Other examples of controlled variables could be an amount of light, using the same type of glassware, constant humidity, or duration of an experiment.
Explanation:
10.0 mL of 3.0 M sulfuric acid has been added to 50.0 mL of water.
What is the new concentration?
M1V1=M2V2
15 M
1.7 M
0.60M
0.20 M
Answer:
the new concentration is 0.60M
Explanation:
The computation of the new concentration is shown below;
We know that
M1V1=M2V2
(3.0M) (10.0 mL) = M2 (50.0mL)
30 = M2 (50.0mL)
So, M2 = 0.60 M
Hence, the new concentration is 0.60M
The same is considered and relevant