Answer:
To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls.
Explanation:
Your welcome! :)
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
Given the reaction:
Ca + 2H,0→ Ca(OH)) + H2
How many moles of H,O are needed to exactly react with
2.0 moles of Ca
Answer:
4
Explanation:
because use the molar ratio of
ca:h2o
1:2
2;4
so u times it by 2 .
hope this helps:)
Why can’t neon store energy in this way?
Answer:
Neon is a noble gas, it is monoatomic in nature, which implies that it has only one atom present. If we compare neon with water, water has three atoms present, two hydrogen atoms and one oxygen atom. Hence water stores more energy than neon because it is polyatomic and contains chemical bonds.
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:
the element magnesium has 3 orbital and 3 electrons true or false
Answer: True
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
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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.
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.
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
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:
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:
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.
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 :)
mention two examples each of solid liquid and gaseous Alkanes
Answer:
gas ; methane , ethane
liquid ; octane , hexane
Explanation;
i cant find solid dear
pls help anyone with an example of a solid alkanes
A solution in which the [H+] is 1.0 X 10-4 mol/L is said to be:
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.
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
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$#'☠️
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.)
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 :)
How many grams of silver nitrate will be needed to produce 8.6 g of silver?
Answer:
13.5g of AgNO3 will be needed
Explanation:
Silver nitrate, AgNO3 contains 1 mole of silver, Ag, per mole of nitrate. To solve this problem we need to convert the mass of Ag to moles. Thee moles = Moles of AgNO3 we need. With the molar mass of AgNO3 we can find the needed mass:
Moles Ag-Molar mass: 107.8682g/mol-
8.6g * (1mol / 107.8682g) = 0.0797 moles Ag = Moles AgNO3
Mass AgNO3 -Molar mass: 169.87g/mol-
0.0797 moles Ag * (169.87g/mol) =
13.5g of AgNO3 will be neededWhich term is used to measure a star's brightness?
Answer:
Magnitude
Explanation:
Astronomers define star brightness in terms of magnitude (how bright the star appears from Earth)
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:
It is the gametes formation of a sex cells or reproductive cells.
Answer:
Meiosis
Explanation:
.bnsksksksjabsn...
Answer:
sana makatulong po sainyo
Struggling on this problem.
Answer:
4Al + 3O2 ----> 2Al2O3
Explanation:
first blank 4
second blank 3
third blank 2
Which has more molecules in it 10g H, 0 or 10g NaCl*
A)010g of H0
B)10g of NaCl
C)They have the same number of molecules
D)Cannot be determined
Answer:
10 grams of hydrogen
Explanation:
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?
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: