Answer:
207g/mol
Explanation:
Given parameters:
Mass of the lead = 41.4g
Number of moles = 0.2mole
Unknown:
Molar mass of lead = ?
Solution:
The molar mass of substance is related to mass and number of moles using the expression below;
Mass = number of moles x molar mass
Molar mass = [tex]\frac{mass}{number of moles }[/tex]
Now insert the parameters and find the molar mass;
Molar mass = [tex]\frac{41.4}{0.2}[/tex] = 207g/mol
During an experiment, 456 g of carbon dioxide is produced. What is the mass of carbon dioxide in kg?
Answer:
0.456
Explanation:
Carbon Dioxide, CO2 0.456
456÷1000=0.456
How much tin II fluoride will be made when reacting 45.0 grams of tin with an excess of hydrofluoric acid if the percent yield for the reaction is 60%
Sn + HF = SnF2 + H2
Mass of SnF₂ produced : 35.634 g
Further explanationReaction
Sn+2HF⇒SnF₂+H₂
mol Sn (Ar 118.710 g/mol) :
[tex]\tt \dfrac{45}{118.710}=0.379[/tex]
mol SnF₂ = mol Sn = 0.379
mass SnF₂ (MW=156.69 g/mol) :
[tex]\tt 0.379\times 156.69=59.39~g[/tex]⇒theoretical
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\60\%=\dfrac{actual}{59.39}\times 100\%\\\\actual=0.6\times 59.39=35.634~g[/tex]
What is true of a decomposition reaction? (4 points)
Answer:
C
Explanation:
It starts with one reactant to give and create new compounds as a product. They need a source of energy that can be heat, light, or electricity to break up chemical bonds.
Answer:
The addition of energy in the form of heat or electricity is often required.
Explanation:
A decomposition reaction is a chemical reaction that starts with single reactants to give new compounds as the products. These reaction requires a source of energy that could be light, heat or electricity to facilitate the breaking-down of the chemical bonds.
To ensure that a vehicle crash is inelastic, vehicle safety designers add crumple zones to vehicles. A crumple zone is a part of a vehicle designed to crumple easily in a crash. Use Newton’s second law to explain why crumple zones reduce the force in a collision.
Answer:
well because with the velocity of the two, using the second law, it can slow the velocity before there is a casualty.
Explanation:
Check all the answers that apply. Energy is the ability to
Question 8 options:
Change speed
Do work
Change direction
Change temperature
A change in temperature causes a change in density. \
True False
Answer:
it will be true
Explanation:
How many unpaired electrons are present in the ground state of the atoms in Group 4A(14)?
unpaired electrons
Answer:
the correct answer is 2
Explanation:
i just did this assignment :)
There will be 2 unpaired electrons in p orbital of unpaired electrons present in the ground state of the atoms in Group 4A(14).
What are unpaired electrons?The unpaired electrons are those which do not have any pair due to absence of no more electrons and they are highly unstable elements if the electrons are not paired in the orbitals.
There are 4 types of orbitals s, p, d, and f s-orbital consist of one pair of electrons to fill and the p-orbital have 3 blocks which can be filled with 3 pair that is 6 electrons after filling, and two unpaired electrons left in p-orbital.
Therefore, in the ground state of the atoms in Group 4A(14) 2 unpaired electrons in the p orbital of unpaired electrons are present.
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this was wrong!! plz answer asap! i cant get this wrong :/
what is the net ionic equation for bel2(aq) + pbso4(aq) = baso4(aq) + pbl2(s)?
Answer:
The net ionic question is bel2(aq) + pbso4(aq)
We see these two addends come at both sides of the equation.
It is the answer to this.
How many grams of Phosphorus is required to complete combustion of 40g Oxygen P+O2-mm>P2O5 . Please balance
Answer:
Mass = 31 g
Explanation:
Given data:
Mass of phosphorus required = ?
Mass of oxygen = 40 g
Solution:
Chemical equation:
4P + 5O₂ → 2P₂O₅
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 40 g/ 32 g/mol
Number of moles = 1.25 mol
Now we will compare the moles of P and oxygen.
O₂ : P
5 : 4
1.25 : 4/5×1.25 = 1
Mass of phosphorus:
Mass = number of moles × molar mass
Mass = 1 mol × 31 g/mol
Mass = 31 g
is it possible to recover reactants like sugar from a drink mix using heat? Explain your answer.
Answer:
Yes it is.
Explanation:
If you melted down the sugar, you can clearly use it.
What do isotopes of an element have in common? How do they differ?
Answer:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
Answer:
It is the electrons that determine the chemical behaviour of a particular element. Isotopes of an element share the same number of protons but have different numbers of neutrons
which compound is made from metals and non metals
Why is there no reaction between solid silver and copper (II) nitrate
For the reaction to occur, it is necessary that the metal which replaces the metal from the compound LIES above that metal in the ELECTROCHEMICAL SERIES(ECS). The metal in the compound here is Copper (II) nitrate where as the metal trying to displace is silver. Silver lies below the copper in a ECS, that means Copper is more reactive than silver. The reaction is not possible because more reactive metal displaces less reactive metal from its compound, and silver is LESS reactive than copper so it cant displace the copper from copper nitrate.
_____________________________________THE ELECTROCHEMICAL SERIES IS ATTACHED BELOWI'll give 40 pts for this one but pls help me....
What is the new volume when the pressure of 20 milliliters of an ideal gas decreases from 202 kPA to 101 kPA?
When the element selenium (Se) ionizes to have a complete valence shell of electrons, the
result will be an lon that is?
Answer:
Positively Charged
Explanation:
The is a group XVI and period 4 element of the periodic table with similar physical and chemical to that of tellurium and sulfur. Selenium exist in different allotropic forms, which have different solubility including selenate, selenite and selenium in elemental form
The Se ion in selenate has a positive charge of +6, while the selenate ion has a charge of -2
The Se ion in selenite has a charge of +4, while the selenite ion has a negative charge of -2.
The charge of Se in elemental selenium is 0.
Please help me solve this USING DIMENSIONAL ANALYSIS! :
Get yourself a snack. Read the nutrition label. How many calories are in the snack? Now convert this into the international unit of energy, the Kilojoule.
How many kJ are in your snack?
1 dietary Calorie = 1000 calories (the dietary Calorie, with a capital C, is what is listed on your nutrition label. This is different than a lower-case c "calorie.")
1 calorie = 4.184 Joules
Complete this sentence: In my ___________, there are _______kJ of energy.
Answer:
Explanation:
Given: 1 dietary Calorie = 1000 calories
1 calorie = 4.184 Joules
But,
1 dietary Calorie = 1 Kcalorie
= 1000 x 4.184 Joules
= 4184 Joules
= 4.184 KJoules
1 dietary Calories contains 4.184 KJ of energy.
A bottle of Coca cola contains 42 Kcalories; thus,
1 Kcalorie = 1000 calories
= 4.184 KJoules
Energy = 42 x 1 dietary Calories
= 42 x 4.184 KJoules
= 175.728 KJoules
Energy ≅ 176 KJ
So that;
In my bottle of coca cola, there are 176 KJ of energy.
PLEASE HELP WITH THIS ASAP
Determine the frequency of light with a wavelength of 4.50 x 10-7 m.
Answer:
f = 0.67×10¹⁵ s⁻¹
Explanation:
Given data:
Frequency of light = ?
Wavelength = 4.50 ×10⁻⁷ m
Solution:
Formula:
Speed of light = wavelength × frequency
Speed of light = 3×10⁸ m/s
Now we will put the values in formula.
3×10⁸ m/s = 4.50 ×10⁻⁷ m × f
f = 3×10⁸ m/s / 4.50 ×10⁻⁷ m
f = 0.67×10¹⁵ s⁻¹
calculate the number of moles of nitrogen gas present in 400cm3 sample of it a pressure of 790 mmHg and 27°C.
Answer:
0.02 mol
Explanation:
Given data:
Number of moles of nitrogen = ?
Volume of sample = 400 cm³
Pressure = 790 mmHg
Temperature = 27°C
Solution:
Volume of sample = 400 cm³ (400/1000=0.4 L)
Pressure = 790 mmHg (790/760 = 1.04 atm)
Temperature = 27°C (27+273=300 K)
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1.04 atm ×0.4 L = n× 0.0821 atm.L/ mol.K ×300 K
0.416 atm.L = n× 24.63 atm.L/ mol
n = 0.416 atm.L /24.63 atm.L/ mol
n = 0.02 mol
14. Killer whales share more traits with dolphins than whales. Therefore, they are the
largest members of the dolphin family.
A.) Claim
B.) Evidence
C.) Reasoning
Answer:
I believe the correct answer is
C.)Reasoning
Explanation:
PLS ANSWER THANK YOUU
Answer:
Chicken Noodle Soup
Explanation:
The rest do have other things in them but are dissolved unlike the chicken noodle soup.
Hope this Helps!!
:D
How much energy is required to raise 10.0 grams of water (c=4.18j/gC) by 20*C?
Answer:
Q = 836 J
Explanation:
Given data:
Mass of water = 10.0 g
Temperature increased =ΔT = 20°C
Specific heat capacity of water = 4.18 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Q = 10.0 g × 4.18 J/g.°C × 20°C
Q = 836 J
HELP ME, MARKED AS BRAINEST
Answer:
The answer is B
Explanation:
2Na + 2H2O = 2NaOH + H2
What is a solution?
Answer
there are to answers one is an answer to a problem or a mixture of chemicals
Explanation:
Answer:
a liquid mixture in which the solute is uniformly distributed within the solvent.
Explanation:
how many joules are needed to warm 25.5 grams of water from 14.0°C to 22.5°C? the heat capacity of liquid water is 4.184J/g°C
Answer:
Q = 906.882 J
Explanation:
Given data:
Mass of water = 25.5 g
Initial temperature = 14.0 °C
Final temperature = 22.5 °C
Specific heat capacity of water = 4.184 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 22.5 °C - 14.0 °C
ΔT = 8.5 °C
Q = 25.5 g × 4.184 J/g.°C × 8.5 °C
Q = 906.882 J
Is PDB ionic or Covalent?
Is Sodium chloride ionic or Covalent?
is Potassium chloride ionic or Covalent?
Answer: Sodium chloride ionic , Potassium chloride ionic, PDB Covalent
Explanation:
Which statement BEST explains whether or not matter is conserved in this chemical reaction? A Matter is being conserved because there is an equal number of atoms of each element in the reactants and products, and the total mass of the reactants is equal to the total mass of the products. B Matter is not being conserved because there are more atoms of oxygen in the reactants than there are in the products, so there is also more mass in the reactants than there is in the products. C Matter is being conserved because carbon, hydrogen, and oxygen are found in the reactants and in the products in different arrangements, and the mass of the reactants is equal to the mass of the products. D Matter is not being conserved because there are 11 units in the reactants, one C8H8 and 10 O2, and 12 units in the products, eight CO2 and four H2O, so there is also more mass in the products that in the reactants.
Answer:
D
Explanation:
The matter is being conserved because the equal number of atoms of each element in the reactants and products, and the total mass of the reactants is equal to the total mass of the products. Therefore, option (A) is correct.
What is the law of conservation of matter?One or more initial substances change into different substances in any chemical change. Both the initial and final substances are made up of atoms as all matter is made up of atoms.
According to the law of conservation of matter, matter can neither be created nor destroyed, we just can convert it from one form to another. So the same number and kind of atoms before and after the chemical change are present.
According to this law, the total mass of the reactants in a chemical reaction must be equal to the total mass of products for a low-energy thermodynamic process.
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Add 2 teaspoons of baking soda and 2 teaspoons of citric acid to the foam cup. Add the half cup of water to the cup and stir. Is a chemical reaction taking place? How do you know? Please help this is due in 2 hours
Answer:
Test for carbon dioxide gas.
Explanation:
The reaction between baking soda and citric acid will form sodium ions, citric acid ions, carbon dioxide gas, and water. So all you have to do is add the gas produced (by gas displacement method or something) and test whether the gas is carbon dioxide, with lime water or other methods like hydrogencarbonate indicator. Hope this helped!
PLEASE GIVE BRAINLIEST
On mixing citric acid and baking soda a chemical reaction takes place which is indicated by the evolution of carbon dioxide gas .
What is a chemical reaction?
Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction, there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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How many possible values are there for the quantity "c", considering a specific chemical reaction represented by the equation aA+bB--> cC +dD, in this equation the letters A,B,C and D represent chemicals, and the letters a,b,c and d represent confessions in the balanced equation.
Answer:
There is only one possible value for the quantity "c"
Explanation:
There is only one possible value for the quantity "c". This is because the a,b,c and d represent number of moles in he balanced equation. And since the number of moles of a particular substance (atom or compound) in a balanced equation must be distinct, it (the substance) can only have one value. For example, consider the equation below
2C₂H₂ + 5O₂ ⇒ 4CO₂ + 2H₂O
It can be seen from the above equation that the individual number of moles are distinct and have just one possible value. And if C₂H₂ is A, O₂ is B, CO₂ is C and H₂O is D, then 4 is "c".
Thus, "c" is the number of moles for the substance "C" with just one possible value.