Answer:
A. The energy change will be positive as bonds are being broken.
Explanation:
The breaking of a bond is an endothermic process. An endothermic process is one in which energy must be absorbed in order for the process to take place.
In breaking a chemical bond,energy is absorbed as the bonding species are being separated from each other.
Hence, the energy change of this process shown will be positive as bonds are being broken.
Why is it important for scientists to use the scientific method?
Answer:
The scientific method attempts to minimize the influence of bias or prejudice in the experimenter. Even the best-intentioned scientists can't escape bias. ... That's the job of the scientific method. It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results.
Answer:
to get used to them
Explanation:
you have to practice them so that they can get into your head
La presión de vapor del agua pura a 25 oC es 24,56 mmHg y la de agua de mar es 23,99 mmHg, y si suponemos que el agua de mar sólo contiene cloruro de sodio, calcula su concentración molal.
Answer:
1.32m es la concentración de NaCl en el agua de mar
Explanation:
La disminución de presión de vapor sigue la ecuación:
P = XP⁰
Donde P es la presión de la solución = 23.99mmHg
X es la fracción molar del solvente
P⁰ la presión del agua pura = 24.56mmhg
23.99mmHg = X*24.56mmhg
0.97679 = X
La fracción molar del solvente se define como:
Moles Solvente / (Moles soluto + Moles solvente)
Asumiendo que las moles de soluto = NaCl = 1:
0.97679 = Moles solvente / (1 + Moles solvente)
0.97679 + 0.97679 Moles solvente = Moles solvente
0.97679 = 0.02321 moles solvente
42 moles solvente = 42 moles de agua.
masa de agua:
42 moles * (18.01g / mol) =758g de agua = 0.758kg
Molalidad, m, son las moles de soluto (1mol NaCl) por kg de solvente (0.758kg):
1mol / 0.758kg =
1.32m es la concentración de NaCl en el agua de marWhen crossing parents with genotypes Rr and rr what will be the percentage of the genotypes of the offspring
Answer:
Explanation:
Heterozygous cross with a hom.ozygous recessive yields the following results
50% rr (hom.ogyzous recessive)
50% Rr (heterozygous dominant)
A heterozygous cross with a homozygous recessive gives the following results: 50% rr (homozygous recessive) and 50% Rr (heterozygous dominant).
What is Parental crossing?Crossing over is a type of cellular process which occurs during the process of meiosis when chromosomes of the same type line up. When these two chromosomes – one from the mother and one from the father – line up, parts of the chromosome can be switched. Two chromosomes contain the same genes, but the genes may have different forms.
The organisms in this initial hybridization are called the parental or P generation. The progeny of the Rr x rr cross are called F1 generation which will have a heterozygous cross with the homozygous recessive giving the following results: 50% Rr (homozygous recessive) and 50% rr (heterozygous dominant)
A cross between two of the offspring in F1 generation would produce a new set of progeny called second filial generation (or F2 generation).
Thus, a heterozygous cross with a homozygous recessive gives the following results: 50% rr (homozygous recessive) and 50% Rr (heterozygous dominant).
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PLEASE HELP MEEEEEEEEEEEEE
Answer:
Explanation:
THE BEST ANSWER IS CCC
How many grams of LiF are needed to make 87 g LiF solution into a
34.5% solution?
solution?
answer options:
30 g LIF
0.01 g LIF
45.8 g LIF
0.02 g LIF
Answer: 30 g LiF
Explanation:
What happens to a catalyst in a reaction?
Question 1 options:
a)
It is incorporated into the products.
b)
It remains unused.
c)
It is incorporated into the reactants.
d)
It evaporates.
Answer:
it's eveporates remains unused products
[tex]\huge{ \mathcal{ \underline{ Answer }\: \: ✓ }}[/tex]
Catalyst are substance that are added to a reaction in order to speed of the reaction.
And they remain the same before and after the reaction, hence the correct option is :
B. It remains unused.
__________________________
[tex]\mathrm{ ☠ \: TeeNForeveR \: ☠}[/tex]
why do some chemical reactions will not generate products?
Answer:
Some chemical reactions will not generate products is because the molecules in a chemical reaction aren´t able to line up with each other correctly.
Explanation:
Answer:
The reason that a chemical reaction doesn't happen is that the molecules weren't able to line up with each other correctly. It's the same as you extending your right hand and your friend extending his right hand at the same time.
Explanation:
Two water molecules are weakly attracted to each other when a slightly positive hydrogen atom in the first molecule is attracted to the slightly negative oxygen atom on the second molecule. What type of bond is this
What reacts with the hydrocarbon fuel in a combustion reaction? small words, please
Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.
#small words#True or False
a. The cones in our eyes detect color, while the rods perceive brightness.
b. In white light, white objects absorb all the colors.
c. At night, when light is dim, our cones are not activated so objects will appear as their normal color.
P.
d. Violet has the longest wavelength which is why it gets refracted the most.
V
e. The angle of incidence always equals the angle of reflection.
true
false
true
true
false
(PLEASE HELP)
Analyzing the pros and cons of a decision can help you make a difficult choice. Which of the following is a pro associated with the use of hydropower as an energy source?
A. A large amount of energy can be released by a small amount of fuel.
B. The use of hydropower produces environmentally friendly waste products.
C. Hydropower is a renewable energy source.
D. The chemical reactions involved remove harmful substances from the air.
A chloride ion, : Cl :i– , acts as a alternate base when it combines with
A. a OH– ion
B. a K+ ion
C. an H– ion
D. an H+ ion
Answer:
D
Explanation:
The answer is D...and if you need explanation you can comment
Which products are the same in both the copper carbonate and the calcium carbonate reactions shown above
Answer:
The common product is H2CO3
Explanation:
Complete question
Which products are the same in both the copper carbonate and the calcium carbonate if they react with hydrochloric acid in different reactions?
Solution
Reaction of copper carbonate and hydrochloric acid is as follows
CuCO3 + 2 HCl --> CuCl2 + H2CO3
Reaction of calcium carbonate and hydrochloric acid is as follows
CaCO3 + 2HCl --> CaCl2 + H2CO3
The common product is H2CO3
Please please help meeee! I will give brainliest
Answer:
The carbons on either side of the double bond are pointed in the same direction
ATOMS: MULTIPLE CHOICE
Answer:
Double bonds. It says I have to write more words lol but yeah it's double bonds
A group of students found metamorphic rocks near a campsite. The presence of metamorphic rock is most likely evidence of that the rock formed from .
Answer:
Igneous or sedimentary rocks.
Explanation:
The presence of metamorphic rock is most likely evidence of that the rock formed from igneous or sedimentary rocks. The igneous rock converted into metamorphic rocks when the rock experience intense heat and pressure within the Earth's crust. These metamorphic rocks are crystalline and often have a “squashed” texture. So due to high temperature and pressure, the metamorphic rock is formed from igneous rock.
what is the ingredient formula for petroleum
Answer:
(C15H15N)
Explanation:
How many significant figures are in the measurement 1.3000 meters
Answer:
5
Explanation:
mark me brainliest!
If you have 500 mL of a 0.10 M solution of the acid, what mass of the corresponding sodium salt of the conjugate base do you need to make the buffer with a pH of 7.74 (assuming no change in volume)
Answer:
5.90g of NaClO are needed
Explanation:
Assuming the weak acid is HClO pKa = 7.54
To solve this question we must use the H-H equation for acids:
pH = pKa + log [A-] / [HA]
Where pH is the pH we want = 7.74
pKa is pKa of the weak acid = 7.54
[A-] could be taken as the moles of the conjugate base (Moles NaClO) and [HA] moles weak acid = 0.500L * (0.10mol/L) = 0.0500 moles HClO
Replacing:
7.74 = 7.54 + log [NaClO] / [0.0500 moles]
0.20 = log [NaClO] / [0.0500 moles]
1.5849 = [NaClO] / [0.0500 moles]
Moles NaClO = 0.0792 moles
The mass is: -Molar mass NaClO = 74.44g/mol-
0.0792 moles * (74.44g / 1mol) =
5.90g of NaClO are needed5.90g of NaClO mass of the sodium salt of the conjugate base are need to make the buffer with a pH of 7.74.
What is pH?pH tells the solution is acidic or basic. pH means potential hydrogen.
Given,
Assuming the weak acid is (hypochlorous acid) HClO
pKa = 7.54
[tex]pH = pKa + \dfrac{ log[A-] }{ [HA]}[/tex]
(Moles NaClO) and [HA] moles weak acid = 0.500L * (0.10mol/L) = 0.0500 moles HClO
Putting the value
[tex]7.74 = 7.54 + \dfrac{ log[NaClO] }{ [0.0500 moles]}\\0.20 =\dfrac{ log}{[0.0500 moles]} \\1.5849 =\dfrac{ [NaClO]}{Moles\;of\; NaClO } = 0.0792 moles[/tex]
The mass is
Molar mass NaClO
= 74.44g/mol - 0.0792 moles * (74.44g / 1mol)
=5.90g of NaClO are needed
Thus, 5.90g of NaClO are needed.
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What do you think are the products of cellular respiration? *
Answer:
Cellular respiration uses oxygen in addition to glucose. It releases carbon dioxide and water as waste products. Cellular respiration actually "burns" glucose for energy.
Explanation:
Formulas for the compounds below.
Sulfur Trioxide
Sodium hydroxide
Sulphur Trioxide = So3
Sodium Hydroxide = NaoH
Answer:
[tex]\huge\boxed{Sulfur \ Trioxide\hookleftarrow}[/tex]
✐ SO3[tex]\huge\boxed{Sodium \ Hydroxide\hookleftarrow}[/tex]
✐ NaOHʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
# ꧁❣ RainbowSalt2²2² ࿐
More energy can be absorbed by a larger sample of a substance due to its higher mass.
True
or
False
?
Answer:
true
Explanation:
Write the chemical reaction happening in self heating cans …..
[tex]\huge\mathsf{\red{\underline{\underline{Answer}}}}[/tex]
[tex]{\green{\dashrightarrow}}[/tex]Self-heating cans work through an exothermic chemical reaction between two chemicals. Popular combinations are aluminum and silica, calcium oxide and water, and copper sulfate and zinc. When the two substances combine, the reaction produces enough heat to raise the temperature of the can.
What is indicated by the methyl-prefix?
Answer:
The molecule is a branched hydrocarbon.
Explanation:
The methyl prefix indicate the presence of a single carbon or the molecule is a branched hydrocarbon.
Prefix in IUPAC NomenclatureThe Prefix is used to show or indicate the substituents, side chains of the molecule and prefix attached to the beginning of a word and the molecules name is based on the number of carbon atoms in IUPAC nomenclature. The International Union of Pure and Applied Chemistry (IUPAC).
For Example:
Number of carbon Atoms Root Name Prefix (side group)
1 meth- methyl-
2 eth- ethyl-
3 prop- propyl-
4 but- butyl-
5 pent- pentyl-
6 hex- hexyl-
7 hept- heptyl-
Thus, we can say that prefix tells us the number of carbon atoms in each molecule. A presence of single carbon is indicated by the methyl prefix or we can also say that the molecule is branched hydrocarbon.
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Pick the MAIN output form of energy.
A snail eating a carrot so the snail has energy to move.
Electrical Kinetic Energy
Motion Kinetic Energy
Chemical Potential Energy
Thermal Kinetic Energy
Motion Potential Energy
Nuclear Potential Energy
Answer:
Chemical Potential Ener
During chemical reactions, in general, the rate of reactions decreases when temperature increases:
1) yes
2) no
Answer:
b the same like this page provide the best way to go with it the hell are nutrients to
Explanation:
bush administration of jute bags and purses and then a good day to day basis and then we will have the same IP Android app and wanted to let you know that I am a
What is the iupac name of CH3-O-CH2-CH2-CH3?
Answer:
The iupac name of CH3-O-CH2-CH2-CH3 is Methoxybutane.
Which of the following are base formulas? (Choose 2)
CH3OH
NH3
CH4
NaOH
HNO3
H2SO4
Answer:
Na0H
Ca(OH)2
NH40H
Are the answers
Most of the electricity that is used in everyday life comes from________ current.
Fill in the blank
Answer:
electric is your answer :)
Explanation:
Edge STEM instruction/assignment perhaps???
Answer:
A. C (alternate current)
Whatt happens to water when its heated from 0 °C to 4 °C?
Answer:
molecules gain energ and start to move quickly
Water has highest density at 4∘C. This changes its properties from other simple fluids. When water is heated from 0∘C to 4∘C, the volume of liquid decreases. Thus for this transition, P ΔV is negative.