Answer:
Law of position
Explanation:
Answer:
Law of Superposition
Explanation:
"A major principle of stratigraphy stating that within a sequence of layers of sedimentary rock, the oldest layer is at the base and that the layers are progressively younger with ascending order in the sequence."
What is the oxidation number for N in the compound NH3? (Recall that H usually has an oxidation number of +1.)
0 -3
0-1
Ο Ο
O +3
Answer:
the oxidation number is -3
Taking into account the definition of oxidation number, the oxidation number for N in the compound NH₃ is -3.
Definition of oxidation numberThe oxidation number is the charge that an atom has; is an integer that represents the number of electrons an atom puts into play when it forms a given compound.
In other words, the oxidation number of an element is a value that indicates the number of electrons that element gains or loses when it combines with another.
Oxidation number determinationTo determine the oxidation state it is necessary to know that The oxidation number of hydrogen in a compound is +1, except in metal hydrides, where is –1.
On the other side, the sum of the oxidation numbers of the existing elements in a chemical formula must add up to zero.
Then, considering the oxidation numbers of each element, multiplying it by the number of existing elements in the chemical formula and adding it and equaling it to zero, the value of the missing oxidation number can be obtained.
Oxidation number of nitrogenIn this case, the oxidation numbers of nitrogen is calculated as:
NH₃: oxidation numbers of nitrogen + 3×(+1)= 0
Solving:
oxidation numbers of nitrogen + 3= 0
oxidation numbers of nitrogen = -3
Finally, the oxidation number for N in the compound NH₃ is -3.
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Which 20.0 g sample of metal is most likely to undergo the smallest change in temperature upon absorption of 100.0 J of heat?
Substance Specific Heat Capacity (J/g*K) Elements aluminum, 0.900 AI graphite, 0.711 iron, Fe 0.450copper, Cu 0.387 gold, Au 0.129a. copper
b. aluminum
c. graphite
d. iron
e. gold
Answer:
b. aluminum
Explanation:
The specific heat capacity is defined as the amount of heat required to raise the temperature of 1g of a material in 1°C.
Thus, the sample with the higher specific heat capacity is the sample that will require more energy to increase its temperature in 1°C, suffering the smallest change in temperature.
Thus, is the aluminium with 0.900J/gK the element that is most likely to undergo the smallest change in temperature:
b. aluminumCAN SOMEONE PLEASE HELP ME I WILL GIVE BRAINLIEST
Answer:
9812
Explanation:
i think
Answer:
if im correct its b but im not 100 percent sure
Explanation:
Diazomethane has the following composition by mass: 28.57% C, 4.80% H, and 66.64% N. The molar mass of diazomethane is 42.04 g/mol. Find the molecular formula of diazomethane.
Answer:
CH2N2
Explanation:
To find the molecular formula, we must first find the empirical formula as follows:
28.57% C - 28.57g of Carbon
4.80% H - 4.80g of Hydrogen
66.64% N - 66.64g of Nitrogen
Next, we convert this mass values to mole by dividing by their respective atomic mass.
C = 28.57/12 = 2.38mol
H = 4.80/1 = 4.80mol
N = 66.64/14 = 4.76mol
Next, we divide each mole value by the smallest mole value (2.38mol)
C = 2.38mol ÷ 2.38 = 1
H = 4.80mol ÷ 2.38 = 2.01
N = 4.76mol ÷ 2.38 = 2
The empirical ratio of C, H and N is therefore 1:2:2. Hence, the empirical formula is CH2N2
To calculate the molecular formula;
(CH2N2)n = 42.04 g/mol
{12 + 1(2) + 14(2)}n = 42.04
{12 + 2 + 28}n = 42.04
{42}n = 42.04
n = 42.04/42
n = 1.00009
Since n = 1, molecular formula is CH2N2
How many electron dots should As have?
Answer:
5
Explanation:
Help fast I really need it bad
Answer:
Pain
Explanation:
the pain depends on u banging your head
what is the purpose of attaching the clip/ clamp with graphite of the the pencil to the battery?
Please help I need help fast
What is the
difference in
the number of
neutrons
between an
atom of
Oxygen and
Boron?
Answer:
its 2
Explanation:
boron has 6 neutrons and oxygen has 8 neutrons on avg.
the difference is 2 neutrons
How are sunspots correlated with the sun's activity?
Answer:
If sunspots are active, more solar flares will result creating an increase in geomagnetic storm activity for Earth.
Explanation:
I ask mom
whats the awnser? i cant find it and i need it asap! anyone i will crown you the brainleist!
Is this a balanced equation?
Answer: NO
Explanation:
Answer:
yes
Explanation:
Which statement about stars is correct?
A. Star formation begins in a nebula.
B. White dwarfs become main-sequence stars when they gain mass.
C. Supergiants are stars that can absorb black holes.
D. Main-sequence stars are formed by comets.
Answer:
A. star formation begins in a nebula.
Explanation:
Which of the following bases is the STRONGEST? The base is followed by its Kb.A. C6H5NH2, 4.0 × 10-10 B. NH3, 1.76 × 10-5 C. CH3NH2, 4.4 × 10-4 D. (CH3CH2)2NH, 8.6 × 10-4 E. C5H5N, 1.7 × 10-9
Answer:
(D) (CH3CH2)2NH
Explanation:
In order to decide which base is strongest we need to calculate its PKb
PKb = -log [Kb]
A large Kb value and small PKb value gives the strongest base
Compound Kb PKb
(A) C6H5NH2 - 4 x 10^-10 9.349
(B) NH3 1.76x 10^-5 4.754
(C) CH3NH2 4.4x 10^-4 3.357
(D) (CH3CH2)2NH 8.6x 10^-4 3.066
(E) C5H5N 1.7x10^-9 8.77
Clearly (CH3CH2)2NH is the strongest base.
How much heat is required to heat 1.6g of ice from -16c to steam at 112c?
Answer:
Total heat ≅ 49.07 kJ
Explanation:
Given that:
mass = 1.6 g = 0.016 kg
Initial temperature = - 16 ° C
final temperature = 112° C
specific heat for ice = 2.06 kJ/kgC
specific heat of water = 4.186 kJ/kgC
heat fusion of ice = 334 kJ/kg
specific heat for steam = 2.1 kJ/kgK
heat of vaporization of water = 2256 kJ/kg
To heat ice from -16 ° C to 0 ° C
Q₁ = 2.06 kJ/kgC × 0.016 kg × 16 ° C
Q₁ = 0.52736 kJ
To melt Ice at 0° C
Q₂= 334 kJ/kg × 0.016 kg = 5.344 kJ
To heat water from 0° C to 100° C
Q₃ = 4.186 kJ/kgC × 0.016 kg × 100° C
Q₃ = 6.6976 kJ
To vaporize water to steam at 100° C
Q₄ = 2256 kJ/kg × 0.016 kg = 36.096 kJ
To heat steam from 100C to 112° C
Q₅ = 2.1 kJ/kgC × 0.016 kg × 12 C
Q₅ = 0.4032 kJ
Total heat = Q₁ + Q₂ + Q₃ + Q₄ + Q₅
Total heat = (0.52736 + 5.344 + 6.6976 + 36.096 + 0.4032) kJ
Total heat = 49.06816 kJ
Total heat ≅ 49.07 kJ
What happens to valence electrons when a covalent bond forms?
Explanation:
Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability
Please help me answer this
What is the difference between the systematic and common name for monatomic ions?
Answer:
The correct answer is B)The systematic name is the metal name followed by the charge on the metal atom. It is written as a Roman numeral and is in parentheses.
The common name is formed from the Latin root followed by -ous for low charge form, -ic for high charge form
I need a hand with this one:
Having this equation:
Na2SO4 +BaCl2 = BaSO4+NaCl
If 10.09 grams of Na2SO4 were added to a 50mL barium solution and reacted completely, what was the BaCl2 molarity of the solution?
Yes, I already know its a displacement reaction
Thx
Answer:
[BaCl₂] = 1.42M
Explanation:
Given: Na₂SO₄(aq) + BaCl₂(aq) => 2NaCl(aq) + BaSO₄(s)
The balanced equation shows a 1:1 reaction between Na₂SO₄(aq) & BaCl₂(aq) and means the moles of sodium sulfate used equals the moles of baium chloride used. The concentration is the theoretical mole value calculated divided by 0.050 Liters.
Na₂SO₄(aq) + BaCl₂(aq) => 2NaCl(aq) + BaSO₄(s)
Moles of Na₂SO₄(aq) = moles of BaCl₂(aq) = 10.09g/142.04g/mol = 0.071mole
∴ Molar Concentration of BaCl₂(aq) = moles BaCl₂/Volume of Soln in Liters
= 0.071mole/0.050Liters = 1.42M in BaCl₂.
A 7.417 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 10.52 grams of CO2 and 6.460 grams of H2O are produced. In a separate experiment, the molar mass is found to be 62.07 g/mol. Determine the empirical formula and the molecular formula of the organic compound.
Answer:
Empirical formula: CH₃O
Molecular formula: C₂H₆O₂
Explanation:
All carbon is converted in CO2 and all hydrogen in H2O. Thus, we can find mass of each element and, by subtracting, the mass of Oxygen:
Mass C:
10.52g CO2 * (1mol / 44g) = 0.239 moles CO2 = Moles C * (12.01g / mol) =
2.87g C
Mass H:
6.460g H2O * (1mol / 18g) = 0.359 moles H2O * 2 = 0.718 moles H * (1g / mol) =
0.718g H
Mass O:
7.417g Sample - 2.87g C - 0.718g H =
3.829g O
Now, we can determine empirical formula defined as the simples whole number ratio of atoms present in a compound with moles of each atom:
Moles C: 0.239 moles C
Moles H: 0.718 moles H
Moles O: 3.829g * (1mol / 16g) = 0.239 moles O
The ratio of moles of each atom divided in moles of oxygen:
C: 0.239 mol / 0.239 mol = 1
H: 0.718 mol / 0.239 mol = 3
C: 0.239 mol / 0.239 mol = 1
Empirical formula: CH₃OThe molar mass of CH3O is:
12.01g/mol + 1g/mol*3 + 16g/mol =
31.01g/mol
That means molecular formula is twice empirical formula because its molecular mass is 31.01g/mol * 2 = 62.02g/mol ≈ 62.07g/mol
Molecular formula: C₂H₆O₂A sample of rubidium contains two different isotopes. 72.15% of the sample
if Rubidium-85 while 27.85% is Rubidium-87. What is the average atomic
mass of the sample?
Answer:
Average atomic mass = 85.557 amu.
Explanation:
Given data:
Percent abundance of Rb-85 = 72.15%
Percent abundance of Rb-87 = 27.85%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (72.15×85)+(27.85×87) /100
Average atomic mass = 6132.75 + 2422.95 / 100
Average atomic mass = 8555.7 / 100
Average atomic mass = 85.557 amu.
CAN SOMEONE PLEASE HELP ME ANSWER THIS QUESTION
Answer:
Carbon Dioxide
Explanation:
Plants inhale Carbon Dioxide and exhale Oxygen
what is triavalent monovilant divalent ?
Answer:
I HOPE IT HELPED THANKS
How many TOTAL ELECTRONS are in the compound CO2?
o (2 dots at the top and 2 on the bottom) = c = o (2 dots on the top and 2 dots on the bottom)
16
14
12
8 ml
What is the correct name for PBr3?
phosphorus bromine
Phosphorus tribromide
monophosphorus tribromide
Answer:
22 electrons are in the compound CO2. And the correct answer is Phosphorus tribromide.
Explanation:
An exothermic reaction
.
In an endothermic reaction, the energy of the products is
the energy of the reactants.
Activation energy is
the potential energy of the products.
An exothermic reaction Produces energy
In an endothermic reaction, the energy of the products is more than the energy of the reactants. and Activation energy is always greater than the potential energy of the products
An endothermic reaction is a reaction which requires an external source of energy before the reaction will take place ( i.e. endothermic reaction absorbs energy in the form of heat from its surrounding ) while an exothermic reaction releases energy in the form of heat into the environment.
Activation energy is amount of energy required to start a reaction since an endothermic reaction absorbs energy from its environment to kick off its reaction, its activation energy is always higher than the potential energy of its products.
Hence we can conclude that An exothermic reaction Produces energy In an endothermic reaction, the energy of the products is more than the energy of the reactants. and Activation energy is always greater than the potential energy of the products.
Learn more : https://brainly.com/question/1160007
Answer:
An exothermic reaction
✔ produces energy
.
In an endothermic reaction, the energy of the products is
✔ more than
the energy of the reactants.
Activation energy is
✔ always greater than
the potential energy of the products.
Explanation:
2023 edge
What is the major cause of the greenhouse effect?
soot from coal plants in the water
carbon dioxide in the water
carbon dioxide in the atmosphere
soot from coal plants in the atmosphere
Answer:
carbon dioxide in the atmosphere
Explanation:
Carbon dioxide in the atmosphere is the major cause of greenhouse effect.
Greenhouse effect is the main cause of global warming.
This effect is produced as a result of some certain gases called greenhouse gases. These gases are carbon dioxide, water vapor, methane etc. They prevent short wave radiations from leaving the earth. This causes the increase in temperature of the surface.Oxygen
Hydrogen
Nitrogen
Carbon
A.
B.
c.
D
Which model represents the chemical formula NO2, nitrogen dioxide?
A)
A
B)
B.
o
C С.
D D
Answer:
the answer is C
Explanation:
there is 1 purple and 2 blues
The model which represents chemical formula of nitrogen dioxide is C.
What is chemical formula ?Chemical formula is a way of representing information about the proportions of elements which are present in a compound or molecule.It is generally written with the symbols of chemical elements. It also makes use of brackets and subscripts.
Number of atoms of each element is written as a subscript .Chemical formula makes use of no words . It is not the same as structural formula .Chemical formula in the simplest form is called as the empirical formula.
Drawbacks of chemical formula are that they do not provide information about the position of atoms and not also on the structure. Owing to these reasons, chemical formula is not that informative as that of structural formula.
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if a horse gallops 1 meter per second, how far can it travel in 1 minute?
pls help
Answer:
60 meters
Explanation:
Whatss the answer giving brainliest:)
Answer:
A.
Explanation:
I just know.
Answer:
a.
Explanation:
Please help me with this question
Answer:
It shows constant motion when a straight line( not parallel) is formed in distance time graph.
