Answer:
a system in chemical nomenclature and notation of indicating the oxidation state of the significant element in a compound or ion by means of a Roman numeral that is used in parentheses after the name or part of the name designating this element and ending invariably in -ate in the case of an anion and that is placed. Stock nomenclature for inorganic compounds is a widely used system of chemical nomenclature developed by the German chemist Alfred Stock and first published in 1919. In the "Stock system", the oxidation states of some or all of the elements in a compound are indicated in parentheses by Roman numerals.
Explanation:
Brainliest please?
The Periodic Table of the Elements is useful for revealing patterns and trends in the elements. Which statement accurately describes a pattern in the size of atomic radii in the Periodic Table of the Elements?
*Atomic radii decrease from left to right across a period and decrease from top to
bottom in a group.
*Atomic radii increase from left to right across a period and increase from top to
bottom in a group.
*Atomic radii decrease from left to right across a period and increase from top to
bottom in a group.
*Atomic radii increase from left to right across a period and decrease from top to
Wottom in a group.
Answer:
The answer is: Atomic radii decreases from left to right across a period and increases from top to bottom in a group.
Explanation:
100 cm3 of hydrogen is mixed with 25 cm3 of oxygen at a temperature of 150qC. The gases react as shown in the equation below. 2H2(g)+ O2(g) o 2H2O(g) The total volume of gas present at the end of the reaction is A 50 cm3 B 100 cm3 C 125 cm3 D 150 cm
Answer:
B 100 cm3
Explanation:
The balanced equation is given as;
2H2(g)+ O2(g) --> 2H2O(g)
From the reaction stochiometry, 2 cm3 of H2 would react with 1 cm3 of O2 to form 2 cm3 of H2O
Before Reaction --> 100cm3 of H2, 25cm3 of O2, 0cm3 of H2O
During Reaction --> 50cm3 of H2, 25cm3 of O2, 50cm3 of H2O
(Oxygen is sed uup in the reaction)
After Reaction --> 50cm3 of H2, 0cm3 of O2, 50cm3 of H2O
Total volume left = Unreacted H2 (50cm3) + 50cm3 of H2O formed
Total Volume left = 50 + 50 = 100cm3
The total volume of gas present at the end of the reaction is 100 cm³
What is a chemical reaction?a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
The balanced equation is given as;
2H₂(g)+ O₂(g) → 2H₂O(g)
From the reaction stoichiometry, 2 moles of H₂ would react with 1 mole of O₂ to form 2 moles of H₂O
Before Reaction: 100cm³ of H₂, 25cm³ of O₂, 0cm³ of H₂O
During Reaction: 50cm³ of H₂, 25cm³ of O₂, 50cm³ of H₂O
(Oxygen is used up in the reaction)
After Reaction: 50cm³ of H₂, 0cm³ of O₂, 50cm³ of H₂O
Total volume left = Unreacted H₂ (50cm³) + 50cm³ of H₂O formed
Total Volume left = 50 + 50 = 100cm³
Hence, The total volume of gas present at the end of the reaction is 100 cm³
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Hi! Can you help me with this?
Is a hydrogen gas a element, compound, or mixture?
Answer:
Hydrogen gas (H2) is a molecule, but not a compound because it is made of only one element. Water (H2O) can be called a molecule or a compound because it is made of hydrogen (H) and oxygen (O) atoms.
Explanation:
Hope this helped!!!
-BB
please mark me brainly
Answer:
It's an element. :)
Explanation:
True or false: an amplifier can adjust the amplitude
Answer:
ᴛʀᴜᴇ.................
Convert 4.92L of hydrogen at STP to moles
Answer:
0.22moles
Explanation:
Given parameters:
Volume of gas = 4.92L
Unknown:
Number of moles = ?
Condition = STP
Solution
At STP, the number of moles of a given gas is expressed as;
Number of moles = [tex]\frac{volume given}{22.4}[/tex]
Number of moles = [tex]\frac{4.92}{22.4}[/tex] = 0.22moles
What would you see if you were standing on the Earth's surface in the penumbra and you were looking up at the sky?
Answer:
clouds?
Explanation:
im sorry i just wanted the 23 points
En un vaso se han puesto 250 g de alcohol junto con 2 g de yodo, que se disuelven completamente. Calcular la concentración de la disolución en % en masa.
The translation of the question is
250 g of alcohol have been put in a glass together with 2 g of iodine, which dissolve completely. Calculate the concentration of the solution in% by mass?
Answer:
The %mass by mass of the given solution is 0.794%
Explanation:
We are given
Mass of solute(Iodine) = 2g
Mass of the solvent (Alcohol) = 250g
Since the Iodine dissolves completely in Alcohol
Total mass of the solution = 250 + 2 = 252g
the formula of concentration of the solution in % by Mass is given by
%[tex]\frac{w}{W} = \frac{Mass of the solute*100}{Total mass of the solution}[/tex]
%w/W = [tex]\frac{2*100}{252}[/tex]
= 0.794%
Therefore the %mass by mass of the given solution is 0.794%
Which one of the following statements about s orbitals is incorrect ?
Group of answer choices
PLS HELP ASAP I DONT KNOW WHAT TO WRITE AND I ONLY HAVE 6 MINUTES HELPP
Answer:
In all of the ecoregions, wind and rain can weather and erode the landforms and soil. Rivers are also
powerful weathering and erosion agents. They can cut into rock and form canyons. When rivers deposit
eroded material, they change their shape or extend the shoreline. When waves along coastlines deposit
sediment, they extend beaches; when they wash sediment away, the waves erode beaches. Rivers, rock
formations, soils, topography, and precipitation in an ecoregion will determine how the processes of
weathering, erosion, and deposition work to reshape it.
Explanation:
How does heat from the sun turn liquid water into gas called water vapor?
Answer:
Explanation:Once energy is added to water by heat from the sun, the bonds between the water molecules gain kinetic energy or energy in motion. Then they escape the surface of the liquid and become a gas (water vapor), which rises into atmosphere.
A sound with more vibrations per second sounds higher than a sound with fewer vibrations per second.
Lesson 4.07
Question 9 options:
True
False
Answer:
that is a false sentence
Answer:
I'm sure you've already finished the est but the real answer is true, I took the k12 test and got that one correct, hope this helps anyone!
Explanation:
5) Determine the mass if lithium hydroxide that is produced when 12.87 g of lithium nitride reacts with
an excess of water according to the following process:
Li,N + 3 H2O + 3 LiOH + NH,
Answer:
Mass = 26.58 g
Explanation:
Given data:
Mass of lithium nitride = 12.87 g
Mass of lithium hydroxide produces = ?
Solution:
Chemical equation:
Li₃N + 3H₂O → 3LiOH + NH₃
Number of moles of of Li₃N:
Number of moles = mass/molar mass
Number of moles = 12.87 g/ 34.83 /mol
Number of moles = 0.37 mol
now we will compare the moles of lithium nitride with lithium hydroxide.
Li₃N : LiOH
1 : 3
0.37 : 3/1×0.37 = 1.11 mol
Mass of LiOH:
Mass = number of moles × molar mass
Mass = 1.11 mol × 23.95 g/mol
Mass = 26.58 g
how many molecules of H3PO4 are in 125 g of H3PO4
Answer:
2.11 * 10^3 molecules of phosphoric acid
Explanation:
Ethyl alcohols formula is C2H50H,what is this?
a.A element
b.A compound
c.A mixture
Explanation:
C2H5OH is ethanol, which is a compound.
1.Identify the types of bonds between the carbon and the two oxogen molecules in the carbon dioxide molecule
2.then describe the bond angle
3. Explain how the structural formula can be used to determine bond angles .
Please help me answer this question.
Explanation:
Hydrochloric acid is HCl.
Hydrogen is H2.
Mole ratio is the numbers infront of them, which is 6 : 3.
Answer:Hydrochloric acid is HCl.
Hydrogen is H2.
Explanation:
Which is a better estimate for the volume of a fish bowl?.
1 gallon
1 cup
Answer: 1 gallon
Explanation:
Answer:
1 gallon
Explanation:
because gallons are constisting of cups and 1 cup wont be enough for a fish to swim
The Calories on a food label indicate the
amount of energy the food contains in
one serving. Which form of energy is
contained in food?
Answer:
chemical energy
Explanation:
what is meant by polimer
Answer:
i don't knoblol
Explanation:
i don't know lol
Answer:
a compound of high molecular weight derived either by the addition of many smaller molecules, as polyethylene, or by the condensation of many smaller molecules with the elimination of water, alcohol, or the like, as nylon. a compound formed from two or more polymeric compounds.
Explanation:
HOPE IT HELPS YOU:))
pls help me with science
On the graph, which dimension would be changed if the rate of reaction were to be altered by a catalyst?
Answer:
The alteration of the rate of the chemical reaction by the addition of a catalyst will change the dimension of L
Explanation:
The parts of the Energy profile of a reaction diagram the given letters represent are;
K = The energy possessed by the reactants
L = Activation energy required for the reaction to take place
M = Energy threshold required for the reaction to take place
N = The change in the enthalpy from the reactants to the products, which is also the energy released
O = The energy possessed by the products
The addition of a catalyst changes the route with which the reaction takes place such that the reaction rate is increased because the activation energy, L, is reduced.
Therefore, the dimension that will be changed if the rate of reaction were to be altered by a catalyst is L.
5.Summarize Which of the following is not an
advantage of using SI units?
A allows scientists to compare observations
and results
B can compare measurements made years
apart
C based on the number 5, which is easy to use
in calculations
D uses prefixes to express measurements that
are small or large
Answer:
C based on the number 5, which is easy to use in calculations
Explanation:
The SI unit system is not based on the number 5.
Please help-- 15 pts!
What kind of liquid will have the highest vapor pressure value?
a liquid with weak intermolecular forces and a low temperature
a liquid with weak intermolecular forces and a high temperature
a liquid with strong intermolecular forces and a high temperature
a liquid with strong intermolecular forces and a low temperature
Happy Holidays!!
Answer:
a liquid with weak intermolecular forces and a high temperature
Explanation:
According to encyclopedia Britannica, "Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature. The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid."
This implies that the vapour pressure of a liquid tends to increase as the temperature of the liquid increases. Recall that vapour pressure also depends on the magnitude of intermolecular forces. The greater the magnitude of intermolecular forces, the lower the vapour pressure hence water has very much higher vapour pressure than ethane.
Answer:
A liquid with weak intermolecular forces and a high temperature
Explanation:
I just took the test and got it right
If there are 5 protons, how many electrons does the atom have?
If there are 5 protons, there should be 5 electrons as well. Boron as an electron configuration of 2-3 or 1s2 2s2 2p.
What is proton ?The term proton is defined as a subatomic particle found in the nucleus of every atom. Its mass is slightly less than that of a neutron and 1,836 times the mass of an electron.
The protons are considered as elementary particles. The protons are called to be composite particles, containing three valence quarks, and together with neutrons are now classified as hadrons.
Boron has an atomic number of 5. In which it has 5 protons. Therefore, the atom also has 5 electrons. Its atomic mass is 10.811. Thus, it has 11 total particles in its nucleus i.e., protons and neutrons.
Thus,If there are 5 protons, there should be 5 electrons as well. Boron as an electron configuration of 2-3 or 1s2 2s2 2p.
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X-rays had a frequency of about 3x10^18 determine it's wavelength (in nm) and energy per photon
Answer:
λ = 0.1 nm
E = 2 × 10⁻¹⁵ J
Explanation:
Step 1: Given data
Frequency of X-rays (ν): 3 × 10¹⁸ s⁻¹
Step 2: Calculate the wavelength (λ) of a photon of X-rays
We will use the following expression.
c = λ × ν
where,
c: speed of light
λ = c / ν
λ = (3.00 × 10⁸ m/s) / 3 × 10¹⁸ s⁻¹
λ = 1 × 10⁻¹⁰ m × (10⁹ nm/1 m) = 0.1 nm
Step 3: Calculate the energy (E) of a photon of X-rays
We will use the following expression.
E = h × ν
where,
h: Planck's constant
E = 6.63 × 10⁻³⁴ J.s × 3 × 10¹⁸ s⁻¹
E = 2 × 10⁻¹⁵ J
help me pleaseeeee, if you do tyyy :)
A stretched out rubber band is an example of:
A. kinetic energy
B. potential energy
C. gravitational energy
D. light energy
By adding electrons to an uncharged object, the object *
becomes negatively charged
becomes positively charged
becomes energized
changes color
Answer:
becomes negatively charged
Explanation:
this is because when an object receives electrons it becomes negatively charged and the object that loses electrons becomes positively charged.
Answer:
First one because by adding more electrons it makes something more negative. So it becomes negatively charged
Balance the equation
__Ni(CIO)3 → _NiCl2+ _02
Can someone answer this for me?
Answer: The moles of nitrogen dioxide produced are 96.3
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}=\frac{3714L}{22.4L}=165.8moles[/tex]
[tex]4NH_3(g)+7O_2(g)\rightarrow 4NO_2(g)+6H_2O(g)[/tex]
According to stoichiometry:
7 moles of oxygen [tex](O_2)[/tex] produce = 4 moles of nitrogen dioxide [tex](NO_2)[/tex]
Thus 168.5 moles of oxygen [tex](O_2)[/tex] will produce = [tex]\frac{4}{7}\times 168.5=96.3[/tex] moles of nitrogen dioxide [tex](NO_2)[/tex]