Answer:
5 point) Chemists used systems and order because they study the basic unit of all forms of matter, which is the atom . However, there are several different kinds of atoms, called elements . Chemists organize these elements using the periodic table .
Explanation:
how many moles are in 1.02 x 10^23 atoms of argon gas
Answer:
0.17 mol
Explanation:
Given data:
Number of atoms of Ar gas = 1.02×10²³ atom
Number of moles = ?
Solution:
The given problem will solve by using Avogadro number.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
1.02×10²³ atom × 1 mol / 6.022 × 10²³ atoms
0.17 mol
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
Pls help please!!! I really need help :(
How can you differentiate or measure the strengths of acids and bases qualitatively and quantitatively?
How does the electrolysis of water produce hydrogen gas?
o
A. Hydrogen cations give electrons to the anode through reduction reactions.
B. Hydrogen cations give electrons to the anode through oxidation reactions.
C. Electrons from the cathode combine with hydrogen cations through reduction reactions.
о o
D. Electrons from the cathode combine with hydrogen cations through oxidation reactions.
г
Answer: C. Electrons from the cathode combine with hydrogen cations through reduction reactions.
Explanation: 100% on edg 2021 quiz
The sun provides heat
1.what is the mass of an atom.
2.what is the difference between an ion and atom.
Answer: Atoms are single neutral particles, and an ion is a positively or negatively charged particle.
Explanation:
As a child (with a mass of 35.0 kg) you take your 5.0-kg sled to Orchard Downs. If you are sliding down the hill on your sled, with a kinetic energy of 260 J, how fast are you moving?
Velocity = 3.61 m/s
Further explanationGiven
mass of child = 35 kg
mass of sled = 5 kg
Kinetic energy = 260 J
Required
velocity
Solution
Energy because its motion is expressed as Kinetic energy (KE) which can be formulated as:
KE = 1/2.mv²
mass of object :
= mass child + mass sled
= 35 kg + 5 kg
= 40 kg
Input the value :
v²=KE : 1/2.m
v²= 260 : 1/2.40 kg
v²=13
v=3.61 m/s
Thermal energy is the energy associated with
O electric fields.
O being stored in chemical bonds.
O the pull of gravity.
O temperature.
Answer:
I think temperature. sorry if the answer is wrong
Thermal energy is the energy associated with temperature. Therefore, the correct option is option D.
What is thermal energy?
By virtue of its temperature, a system in a condition of thermodynamic equilibrium has thermal energy, or internal energy. Unlike the energy of systems which are not in a state of thermodynamic equilibrium, thermal energy cannot be transformed into meaningful work as quickly.
For instance, the energy contained in a flowing fluid or perhaps a moving solid can be used to create mechanical work in a windmill or even a waterwheel, yet a single fluid or solid with the same energy in a thermal equilibrium state cannot produce mechanical work unless it's combined with some other substance at such a different temperature. Thermal energy is the energy associated with temperature.
Therefore, the correct option is option D.
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Why methanol is not an alkane
Answer: it’s not in the first group in the periodic table
Explanation:
When a nitrogen atom becomes an ion, the atom becomes a... A. Negative ion with a radius smaller than the radius of the atom B. Negative ion with a radius larger than the radius of the atom C. Positive ion with a radius smaller than the radius of the atom D. Positive ion with a radius larger than the radius of the atom
Answer:
B. Negative ion with a radius larger than the radius of the atom
Explanation:
When a negative ion is formed, electrons are added to the atom. As electrons are added to the atom, the size of the electron cloud increases accordingly.
As a result of this, a negative ion is always larger than its corresponding atom. Hence, nitrogen ion must be larger than the nitrogen atom based on the facts stated above.
The Earth’s circumference around the equator is slightly bulged as compared to the circumference around the poles. If the circumference around Earth’s equator is 29,902 miles, what is this in Mm?
Answer: 48.123 Mm
Explanation:
according to the kinetic molecular theory which statement describes the particles in a sample of an ideal gas
Answer:
According to the kinetic molecular theory, which statement describes the particles in a sample of an ideal gas? The motion of the gas particles is random and in a straight-line.
Explanation:
look at the answerAccording to the kinetic molecular theory, which statement describes the particles in a sample of an ideal gas? The motion of the gas particles is random and in a straight-line.
1.
Which description accurately compares mass and weight?
A Mass indicates the density of an object, while weight indicates its volume.
B. O Mass indicates the volume of an object, while weight indicates the pull of gravity on an object.
Mass indicates how much matter an object has, while weight indicates the pull of gravity on a
Mass indicates the pull of gravity on an object, while weight indicates the amount of matter ar
D
Answer:
B
Explanation:
What happens to the volume of a liquid when pressure is applied? A. Increases B. Decreases C. Stays the same D. Evaporates
Answer:
it willl have less dense and decreases the voloume of liquid .
Answer:
Stays the same maybe?
Explanation:
Changes in presure have very little effect on the volume of a liquid. Liquids are relatively incompressible because any increase in pressure can only slightly reduce the distance between the closely packed molecules. If the pressure above a liquid is increased sufficiently, the liquid forms a solid.
Using stoichiometry a student determines that 33.3 grams of PbCrO4 will be produced during a reaction. After performing the experiment, 27.2 grams of PbCrO4 are collected. What is the percent yield of the reaction?
Answer:
81.7% is percent yield of the reaction
Explanation:
Percent yield of a reaction is defined as 100 times the ratio between actual yield and theoretical yield of the reaction. The theoretical yield is obtained using stoichiometry.
In the problem, theoretical yield was 33.3g of PbCrO₄ and the yield obtained was of 27.2g of PbCrO₄. That means percent yield is:
27.2g / 33.3g * 100
= 81.7% is percent yield of the reaction
Carbon is the most common element in the human body.
True
False
state the reason
Give the ideas that you have at this time about how energy relates to differences between solids, liquids and gases.
Answer:
The energy content of substances is related to the physical state in which the substance exists. Molecules of gases are always in motion as they possess very high kinetic energy, hence, they exist as gases. Liquid molecules are less energetic than gas molecules, hence they have less flow than gases. Solid molecules on the other are fixed at a place because they possess very low kinetic energy and can only vibrate about their fixed positions.
Explanation:
The three states in which matter exist are solid, liquid and gas.
Solids are made of molecules that are closely packed together and held together by strong intermolecular forces. The particles in a solid possess very low kinetic energy and are not free to move about but can only vibrate and rotate about their fixed positions.
Liquids particles are able to move about as they possess enough kinetic energy to limit or reduce the strength of the intermolecular forces binding them together. Thus, liquids can flow.
The particles in a gas are relatively far apart and possess kinetic energy more than the particles of a liquid or solid. The intermolecular forces binding particles of gas together are weak due to the very high kinetic energy of yhe gas particlest
Tin fluoride, SnF2, is used in some toothpastes. It is made by the reaction of tin with hydrogen fluoride according to the following equation: Sn(s) + 2HF(g) --> SnF2(s) +H2(g). If a toothpaste manufacturer reacts 30.00 of HF with enough tin, how many grams of SnF2 can they expect to get?
Please show your work or how you got the answer, I really need it.
Mass of SnF2 : 117.53 g
Further explanationGiven
Reaction
Sn(s) + 2HF(g) --> SnF2(s) +H2(g).
30 g of HF
Required
mass of SnF2
Solution
mol HF (MW= 20 g/mol) :
= mass : MW
= 30 : 20
= 1.5
From the equation, mol ratio of HF : SnF2 = 2 : 1, so mol SnF2 :
=1/2 x mol HF
= 1/2 x 1.5
= 0.75
mass SnF2(MW=156.71 g/mol) :
=mol x MW
= 0.75 x 156.71
= 117.53 g
What are characteristics of a chemical equation?
a.Equation must contain correct formulas for reactants and products.
b.Equation must represent known facts .
c.Equation must satisfy Law of Conservation of Mass.
d.All of the above.
e.Number 1 and 3 only.
Number of atoms in 125 g of C2H22011
Could someone suggest an experiment to the statement on why hydrogen peroxide is stored in a dark bottle
Answer:
Hydrogen peroxide is not stored in clear bottles because they are transparent and light can easily penetrate through these glass bottles to oxidize into water and oxygen gas
Explanation:
there you go
HELP ASAP ITS TIMED!!!
Which of the following hydrocarbon are the most reactive?
Select one:
a. C7H12
b. C8H18
c. C7H16
d. CH4
Answer:
C would be the right answer
Answer:
B
Explanation:
I have a similar question and it was correct try B
What mass of fluorine is needed to completely react with 3.6 grams of water?
= 18.02 g/mol) im sure its that
What is the formula for compound formed by Iron ( II ) ions and chromate ions?
Answer:
The formula of the compound formed by Iron (ii) ions and chromate ions is FeCrO₄
Explanation:
Iron (ii) ions, Fe²⁺ have a positive charge of +2. Chromate ions, CrO₄²⁻, on the other hand have a positive charge of -2. When iron (ii) ions and chromate ions combine two form a compound, each ion will contribute a mole of ion towards the formation of the compound. This is in line with the idea that a compound carries no charge. The positive charge (+2) of the iron (ii) ions are balanced by the negative charge of the chromate ions as shown mathematically as follows;
+2 + (-2) = 0; i.e. Fe²⁺ + CrO₄²⁻ = FeCrO₄
Therefore, the formula of the compound formed by Iron (ii) ions and chromate ions is FeCrO₄
The formula formed by the compound by Iron ii ions and chromate ions will be FeCrO₄
What will be the formula for the compound of Iron ii and chromate ions?Iron (ii) ions [tex]\rm Fe^{2+}[/tex] have a positive charge of +2. Chromate ions, [tex]\rm CrO_3^{2-}[/tex] on the other hand, have a positive charge of -2.
When iron (ii) ions and chromate ions combine to form a compound, each ion will contribute a mole of ion towards the formation of the compound.
This is in line with the idea that a compound carries no charge. The positive charge of the iron (ii) ions 2+ are balanced by the negative charge of the chromate ions -2 as shown mathematically as follows;
[tex]\rm +2+(-2)=0[/tex]
[tex]\rm Fe^{2+} +CcrO_4^{2-}=FeCrO_4[/tex]
Thus the formula of the compound formed by Iron (ii) ions and chromate ions is FeCrO₄
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Can someone please try and help me with this? I'll give brainliest if I can
Answer:
boom Corvette Corvette pop in the popular vet like that like that why you walk like that why you talk like that like I said boom boom boom I'm in the cold Mira, she needs to be back I remember seeing everyone Nee u i
What affect might plate movement have on the size of the ocean basin
(Science)
The affect of plate movement might have on the size of the ocean basin would be negative and over many millenia it will gradually decrease in size
a.
Zn (s) + HCl (aq)
→ ZnCl2 (aq)
+ H2(g)
b. 2H20 (1)→ H2(g) + O2(g)
c. ALC3 (s) + H20 (1) → CH4 (g) + Al(OH)3 (s)
d. CH4 (g) + 2O2(g) → CO2 (g) + 2H20 (3)
Which chemical equation supports the law of conservation of mass
Answer:
CH₄ + 20₂ → CO₂ + 2H₂O
Explanation:
The reaction equation that supports the law of conservation of mass is the one in which the number of atoms on both sides of the expression are found to be the same.
The law of conservation of mass states that "in a chemical reaction, matter is neither created nor destroyed".
The reaction expressions are given as:
Zn + HCl → ZnCl₂ + H₂
2H₂O → H₂ + O₂
AlCl₃ + H₂O → CH₄ + Al(OH)₃
CH₄ + 20₂ → CO₂ + 2H₂O
In the highlighted reaction above:
Number of atoms
Reactants Products
C 1 1
H 4 4
O 4 4
Elephant toothpaste is an example of a chemical reaction.
True
False
True, "The foam is oxygen-filled bubbles that result from the hydrogen peroxide being broken down into water (H2O) and oxygen (O2)."
how do the electrons not fall into the nucleus? simple explanation please :)
Answer:
because they have fixed orbit according to its power QM probhits electron to fall into nucleus
Scientists found evidence of a fish that lived
millions of years ago. The fish had features that
were possibly used to move on land. This fish is
now extinct.
What scientific evidence did the scientists most
likely find that confirmed the existence of this fish?
a fossil
B.
a description
C.
a photograph
D.
a cave drawing
Answer:
fossil
Explanation:
Calculate the second volumes.
7.03 Liters at 31 C and 111 Torr to STP
The second volume : V₂= 0.922 L
Further explanation Given7.03 Liters at 31 C and 111 Torr
Required
The second volume
Solution
T₁ = 31 + 273 = 304 K
P₁ = 111 torr = 0,146 atm
V₁ = 7.03 L
At STP :
P₂ = 1 atm
T₂ = 273 K
Use combine gas law :
P₁V₁/T₁ = P₂V₂/T₂
Input the value :
0.146 x 7.03 / 304 = 1 x V₂/273
V₂= 0.922 L
