What is the simplest whole number ratio of atoms in a molecule or formula unit called?
the molecular formula
the molar mano
the percent composition
the empirical formula
PLEASE HELPP
Can some answer this?
Determine the mass of the following samples.
7.52 X 10 25molecules of NH3
Explanation:
Find moles first
moles = number of particles/ 6×10^23
= 7.52 ×10^25 / 6×10^23
=125.33
calculate molar mass
(1×14) +(3×1) =17
convert to mass
mass= moles × molar mass
=125.33 × 17
=2130.67g
This is a pretty big value usually it's smaller but I'd assume it's because the number of particles was large.
How many moles are in 4.01x10^24 particles?
Answer:
6.64
Explanation:
so moles
[tex] \frac{number \: of \: \: particles \: }{6.02 \times {10}^{23} } [/tex]
then do =4.01×10^24/6.02×10^23
you get the answer as 6.6445 u only need to write the answer to
3.S.F 6.64 moles
hope this make sense :)
The compounds that form from the bonding of the hydroxyl group (-OH) to a hydrocarbon are called the aldehydes.
True
False
Answer:
False.
I just got it right, lol.
Which of these is true for natural selection but not artificial selection?
A.Humans choose specific organisms to reproduce.
B.Competition for resources determines reproductive success.
C.Unfavorable traits decrease in frequency in a population.
D.Genetic engineering introduces new traits into a population.
Answer:
B
Explanation:
URGENT!! 7.(06.02 MC)
A list of changes is shown.
A. Temperature decreases
B. Intermolecular bonds become weaker
C. Melting
D. Intermolecular bonds
become stronger
E. Temperature remains constant
F. Temperature increases
G. Vibration of molecules slows down
H. Molecules vibrate faster
Which of the above changes would be accompanied by an increase of the kinetic energy of particles in a solid? (5 points)
1. A, B, C, and H
2. A, C, D, and G
3. B, E, F, and G
4. B, C, F, and H
Answer:
3.B,E,F and G
Explanation:
1.A,B,C and H
Answer:
4. B, C, F, and H
Explanation:
Hydrazine, N2H4, reacts with dinitrogen tetroxide, N2O4:
2 N2H4 (l) + N2O4 (g) → 4 H2O (l) + 3 N2 (g)
When 0.10 mol of hydrazone reacts with 0.10 mole of dinitrogen tetroxide, which of the following quantities would be consumed or produced?
Select one:
Answer:(I)+3 N2(g) that is correct
Explanation:
Use the reaction N2(g) + 3H2(g) 2NH3(g) to answer the following questions
a. 1 pt: What does Le Châtelier's principle predict would happen to the equilibrium conditions if N2(g) + 3H2(g) were added to the system?
b. 1 pt: What would happen to the equilibrium if the pressure were decreased?
c. 2 pts: Write the equation for calculating Keq
d. 3 pts: Calculate the value for Keq given the following concentrations
[NH3] = 6 M
[H2] = 4 M
[N2] = 3 M
Answer:
K
C
=
[N
2
][H
2
]
3
[NH
3
]
2
N
2
+3H
2
⇌2NH
3
=
(1.5×10
−2
)(3×10
−2
)
3
(1.2×10
−2
)
2
=
1.5×10
−2
×27×10
−6
1.44×10
−4
=
40.5×10
−4
1.44
=0.035×10
4
I. Witch direction does the electric field point at a position directly west of a positive charge
Answer:
The answer is North
Explanation:
The direction of the field is taken to be the direction of the force it would exert on a positive test charge.
the element magnesium has 3 orbital and 3 electrons true or false
Answer: True
Explanation:
calculate the pressure in atm of .68 mol of H at 298K and occupying 4.5 L
Answer:
3.7 atm
General Formulas and Concepts:
Atomic Structure
MolesGas Laws
Ideal Gas Law: PV = nRT
P is pressureV is volumen is number of molesR is gas constantT is temperatureExplanation:
Step 1: Define
Identify variables
[Given] n = 0.68 mol H
[Given] T = 298 K
[Given] V = 4.5 L
[Given] R = 0.0821 L · atm · mol⁻¹ · K⁻¹
[Solve] P
Step 2: Find Pressure
Substitute in variables [Ideal Gas Law]: P(4.5 L) = (0.68 mol)(0.0821 L · atm · mol⁻¹ · K⁻¹)(298 K)Multiply [Cancel out units]: P(4.5 L) = (0.055828 L · atm · K⁻¹)(298 K)Multiply [Cancel out units]: P(4.5 L) = 16.6367 L · atmIsolate P [Cancel out units]: P = 3.69705 atmStep 3: Check
Follow sig fig rules and round. We are given 2 sig figs as our lowest.
3.69705 atm ≈ 3.7 atm
¿Cuál de las siguientes configuraciones globales corresponde a un elemento químico que se comporta como metal? 1 punto [He]2s2 2p6 [Ar] 4s2 3d2 4p3 [Ne]3s2 [Ar] 4s2 3d10 4p4
Answer:
[Ne]3s2
Explanation:
ahora tenemos que mirar cada una de las configuraciones electrónicas de cada átomo de cerca antes de tomar una decisión.
considerando la configuración electrónica más externa de cada una de las especies mostradas;
para la primera configuración, ns2 np6 corresponde a un gas noble.
para la segunda configuración ns2 np3 corresponde a un elemento no metálico del grupo 5.
para la tercera configuración, ns2 corresponde a un elemento metálico del grupo 2.
para la cuarta configuración, ns2 np4 corresponde a un elemento no metálico del grupo 6
Carbon (C): 1sH2sI2pJ
H=
I =
J =
Answer:
H =2; I = 2; J = 2
Explanation:
Carbon is element 6 in the Periodic Table.
Start at element 1 (H) and count from left to right until you reach element 6 (C).
You get the electron configuration
C: 1s² 2s²2p².
Thus,
H =2; I = 2; J = 2
sources of magnesium to plants
It is the gametes formation of a sex cells or reproductive cells.
Answer:
Meiosis
Explanation:
.bnsksksksjabsn...
Answer:
sana makatulong po sainyo
URGENT PLEASE HELPIf 25 grams of liquid water releases 75J of heat when water cools from 88 degrees Celsius what is the final temperature?
Answer:
HEY RUBY!! WE ARE BOTH FAILING!!!!!!!
Explanation:
#&-78$#'☠️
How many atoms are in 0.432 g of KNO3? Round your answer to three significant
figures.
A…2.58 x 1021
B…7.10 x 10-27
C…0.00428
D…43.6
A
I did it and got this but it know the first one is right as it only missing of some point it will be calculator error and also the answer is to the power of 21.
hope this make sense :)
Indica en qué modelos se fueron descubriendo las partículas atómicas y las unidades en la que se expresan su masa y su carga eléctrica
Answer:
En total son 8 modelos, en la explicación los nombraremos por orden de antigüedad.
Explanation:
Modelo atómico de Demócrito (450 a.C.)
Modelo atómico de Dalton (1803 d.C.)
Modelo atómico de Lewis (1902 d.C.)
Modelo atómico de Thomson (1904 d.C.)
Modelo atómico de Rutherford (1911 d.C.)
Modelo atómico de Bohr (1913 d.C.)
Modelo atómico de Sommerfeld (1916 d.C.)
Modelo atómico de Schrödinger (1926 d.C.)
If the pH of a solution is 3, its pOH is
Explanation:
If the pH of a solution is 3, its pOH is 14-3= 11
Select the correct answer.
What does the empirical formula of a compound describe?
Ο Α. .
the type and number of atoms
OB.
the type and ratio of atoms
O C.
the number of atoms
OD
the type and mass of atoms
Reset
Next
Answer:
b
Explanation:
cause empirical formular is the elementary or the foundation for molecular formula and molecular formula depends on the empirical formula
what form of the ideal gas law would you use to calculate the volume of gas
Answer:
V = nRT/P
Explanation:
The ideal gas law states that
PV=nRT
where P = pressure, V = volume, n = number of moles, R = ideal gas constant, and T= temperature
P V = n R T
to get V on its own, divide both sides of the equation by P
V = (nRT)/P
any artist out there?
I need help knowing what colors I should use for a painting.
you can explain your question i can help if i know it
Answer:
You could use red, blue, yellow, white, black, brown, green, orange, purple
Other useful colors:
Payne grey
Yellow or golden ocher
Titanium buff or raw titanium
Explanation:
A solution in which the [H+] is 1.0 X 10-4 mol/L is said to be:
What charge would Balloon #2 have? How did you determine this?
Answer:I belive it would be attracted seeing as how there are more magmatic charges on that side of no 2 and how there are more positive charges on the middle side of ballon no1.
Explanation:
Struggling on this problem.
Answer:
4Al + 3O2 ----> 2Al2O3
Explanation:
first blank 4
second blank 3
third blank 2
identify water resevoirs as usuable or unusuable on their current state
number 2 pls help me :):)
Answer:None of the tunes make a correct statement the third choice is closed but may still dating the pencil operates broken because the light been to a zoo from a straight line when it across the boundary between air and water
Explanation:
Which BEST describes how the genetic color variation within the beetle population helps them to survive? A. The color variation helps them to locate food B. The color variation helps them avoid predators C. The color variation helps them compete for resources D. The color variation helps them find mates for reproduction
Answer: B
Explanation: The beetles would be able to use their genetic color to learn how to adapt to the environment and hide from predators.
The statement, that describes the genetic color variation within the beetle population helps them to survive is "the color variation helps them avoid predators."
What is genetic variations?Genetic variations that can exist in a human population include skin color, hair color, dimples, freckles, and blood type. Human skin tone is a classic changeable characteristic that is regarded to be adaptive. Natural selection can result in major changes in the appearance, behavior, or physiology of individuals in a group in a matter of generations.
What is color variation?Meiosis and sexual reproduction combine various alleles in novel ways to generate genetic variety once new alleles emerge. Because of natural selection, green beetles outnumber red beetles. Color diversity can involve camouflage, and beetles could utilize their genetic color to learn how to adapt to their surroundings and hide from predators.
Because this feature has a genetic foundation, the surviving beetles have progeny of the same hue. Brown coloring, which permits the beetle to have more offspring, becomes increasingly prevalent in the population.
Hence the correct option is B.
Learn more about genetic color variation here
https://brainly.com/question/9983861
#SPJ2
If crystal growth does not start on its own after the solution in the flask returns to room temperature, identify the best ways to promote this process. Select one or more: Add a bit of solid as a seed crystal. Scratch the bottom of the flask gently with a stirring rod. Place the flask on a hot plate to evaporate some solvent. Add ice cubes to the solution.
Answer: The best way to promote the process are:
--> Add a bit of solid as a seed crystal.
--> Scratch the bottom of the flask gently with a stirring rod.
Explanation:
A crystal growth is seen is SUPERSATURATED solutions which contains more solute than it can normally dissolve at that given temperature. It is usually very UNSTABLE and capable of releasing the excess solute if disturbed, either by shaking or seeding with a tiny crystals.
Crystallization can be used for the separation of two salts with different solubilities as well as for purification of a soluble salt that contains insoluble solid impurities. Recrystallization improves the validity of the process. Crystallization can be initiated by:
--> Scratching the bottom of the flask gently with a stirring rod: scratching initiates crystallization by providing energy from the high-frequency vibrations.
--> Adding a bit of solid as a seed crystal: Seed crystals create a nucleation site where crystals can begin growth.