Calculate the pressure kPa of 0.421 mole of helium gas at 254 degree celsius when it occupies a volume of 3.32 L.
Enzymes are proteins that speed up chemical reactions in the body.
How do they work?
A) They provide a path with lower activation energy.
B) They increase the concentration of reactants.
C) They decrease the concentration of products.
D) They increase the surface area of reactants.
Answer:
D. They Increase the surface area of reactants.
Explanation:
And why I say the answer is D, Because Enzymes are soluble protein molecules that can speed up chemical reactions in cells
When Enzymes are proteins that speed up chemical reactions in the body so here it increase the surface area of reactants. hence, option d is correct.
What are enzymes?It is the substance that is treated as the catalyst in the living organism.
In this, the biological process arises within the living organism are considered to be the chemical reactions.
Also, enzymes should be soluble protein molecules that speed up the chemical reaction in cell.
hence, the option d is correct.
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Calculate the molarity of the following solution: 1.0 mole of KCl in .75 L of solution.
1.3 M
2.0 M
0.750 M
99 M
Answer:
1.3 M
Explanation:
1 mole= Concentration * Volume
1 mole=C*0.75 L
C=1.3 M
Write the electron configuration for Gold (Au). You may choose to write it in the long form or in the noble gas configuration form (shortcut).
Answer:
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s¹4f¹⁴5d¹⁰
Explanation:
In which classification of matter are the components chemically combined?
A metal
B compound
C mixture
D Metalloids
If the change in velocity increases, what happens to the acceleration during the same time period?
Acceleration decreases.
Acceleration increases.
Acceleration becomes negative.
Acceleration becomes steady.
Answer:
Acceleration decreases
Answer:
its b
Explanation:
How many silicons atoms are there in 0.0356 moles of silicon
Answer:
2.14 × 10²² atoms Si
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesStoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Identify
[Given] 0.0356 mol Si
[Solve] atoms Si
Step 2: Identify Conversions
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
Step 3: Convert
[DA] Set up: [tex]\dipslaystyle 0.0356 \ mol \ Si(\frac{6.022 \cdot 10^{23} \ atoms \ Si}{1 \ mol \ Si})[/tex][DA] Multiply [Cancel out units]: [tex]\dipslaystyle 2.14383 \cdot 10^{22} \ atoms \ Si[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
2.14383 × 10²² atoms Si ≈ 2.14 × 10²² atoms Si
How much mass does 1 mol of O2 gas have?
O A. 16.00 x 2g
O B. 16.00 x (6.02 x 10^23) g
C. 2 x (6.02 x 10^23) g
D. 16.00 g
Answer:
Option A.
Explanation:
1 mol of anything contains 6.02×10²³ particles.
We know that 1 mol of oxygen gas contains 2 moles of O.
1 mol of oxygen weighs 16 g/mol, the mass for 1 molecule of O.
By the way, the mass for 1 mol of O₂ may be:
Option A → 16 g/mol . 2 mol
32 g
Oyxgen is a dyatomic molecule, that's why we have 2 moles of O.
Another example can be:
1 mol of water (H₂O) contains 2 moles of H and 1 mol of O.
2. When we lift a stool, its ____________
A) gravitational potential energy is increased
B) gravitational potential energy is decreased
C) kinetic energy is decreased
D) gravitational potential energy remains unchanged
A.)
Standing on an elevated ledge would be more potential energy than standing on the ground. Same applies for anything else -- Including a chair!
please help me thank u !
[tex]what \: is \: acid \: \: \: {?} [/tex]
meaning:An acid is a chemical substance, usually a liquid, which contains hydrogen and can react with other substances to form salts. Some acids burn or dissolve other substances that they come into contact with.
Answer:
Hope it help you#CarryOnLearninghow many moles are in 150 grams of water
Answer:
Solution given:
H20=1+1+16=18grams
we have
1 mole of water =18grams
now
150grams of water=1/18*150=25/3 =8.33mole.
150 grams of water =8.33mole.
Note:
mole =given mass/actual mass of molecule/atom
1 mole of water is 18 grams.
Then,
150 grams of water,
→ 1/18 × 150
→ 25/3
→ 8.33333 . . .
Hence, 150 grams of water is 8.3 moles.
Consider the reaction 4FeS2 + 11O2 → 2Fe2O3 + 8SO2. If 8 moles of FeS2 react with 15 moles of O2, what is the limiting reactant? (3 points)
Select one:
a. FeS2
b. Fe2O3
c. O2
d. SO2
If 8 moles of FeS2 react with 15 moles of O2, the limiting reactant is O2.
WHAT IS LIMITING REACTANT:A limiting reactant is reactant that is totally consumed when the chemical reaction is completed.According to this question, the following reaction was given: 4FeS2 + 11O2 → 2Fe2O3 + 8SO2.4 moles of FeS₂ reacts with 11 moles of O₂
This means, 8 moles of FeS₂ will react with (8 × 11/2) = 22 moles of O₂15 moles of O₂ is available. In comparison with 22 moles, O₂ is in short supply .
Therefore, If 8 moles of FeS2 react with 15 moles of O2, O₂ is the limiting reagent.
Learn more about limiting reactant at: https://brainly.com/question/14225536
Answer:
They are right it's O2
Explanation:
I accidently rated it low but it's 100% right
Which of the following is a correct statement about water?
A)Hydrogen bonding causes water to be strongly cohesive.
B)Hydrogen bonding causes water to have a low surface tension.
C)Water is a universal solvent because polar and nonpolar solutes can dissolve in it.
D) Water is less dense as a liquid than as a solid because of changes in bond structure.
Answer:
D) Water is less dense as a liquid than as a solid because of changes in bond structure.
Explanation:
I hope I was able to help!
Have a nice day :)
The correct statements about water is that hydrogen bonding causes water to be strongly cohesive and is less dense as a liquid and solid.
What is hydrogen bonding?It is bonding in between the hydrogen atom and most electronegative atoms like flourine, chlorine, oxygen atoms, etc.
In water molecule hydrogen bonding is present in the form of intermolecular as well as intramolecular force and makes it more cohesive to get attracted towards each other.Water molecule has a high surface tension, as a result of which it is able to form a drop of water.Water is not a universal solvent, else it is a polar solvent and able to dissolve only polar molecules.It is also true that water is less dense as a liquid than as a solid because of changes in bond structure.Hence water is less dense as a liquid than as a solid because of changes in bond structure and hydrogen bonding causes water to be strongly cohesive.
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What type of molecule is shown below?
A. Ether
B. Alcohol
C. Aldehyde
D. Ketone
The given molecule is an aldehyde with the formula HCHO. It is the simplest and primary aldehyde . Hence, option c is correct.
What are aldehydes ?Aldehydes are a class of organic compounds that contain a carbonyl group (a carbon double-bonded to an oxygen) at the end of a carbon chain. The general formula for an aldehyde is RCHO, where R is a substituent or side chain attached to the carbonyl group.
Aldehydes are often characterized by their distinctive odor, which can be described as pungent and irritating. Some common aldehydes include formaldehyde (used in building materials and as a disinfectant), acetaldehyde (found in alcoholic beverages), and benzaldehyde (used in food flavorings).
Aldehydes are important intermediates in many chemical reactions, and they are used in a variety of industrial and laboratory applications. They can be synthesized by the oxidation of primary alcohols or by the partial oxidation of hydrocarbons. The given compound is formaldehyde HCHO.
Find more on aldehydes:
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What is the gram molecular mass of a compound if 5 moles of the compouns has a mass of 100 grams?
Answer:
20 grams.
Explanation:
5 mols of a compound has a mass of 100 grams
1 mol of the same compound has a mass of 100/5 = 20 grams
The
volume
occupied by 5.0g in neon
03368 atm and
a temperatureof
35°C will be?
Answer:
uryehrufurudududjehshsyshzyyxzhsu
help chemistry pls answer
The expression for the equilibrium constant for the reaction:
Ba3N2 (aq) + 6 H2O(1)-
3 Ba(OH)2 (aq) + 2 NH3 (9)
Answer:
[tex]Kc\frac{(Ba3N2)(H2O)^6}{(Ba(OH)2)^3(NH3)^2}[/tex]
Explanation:
Because kc equals products/reactants hope this helps :)
Which statement accurately describes a P wave?
Answer:
A P wave can move through solid rock only. P wave can travel through liquid accurately describes a P wave.
which of these elements has two valence electrons?
a. hydrogen (H)
b. barium (Ba)
c. nitrogen (N)
d. krypton (Kr)
e. bromine (Br)
Calculate the volume of an
object with the following
dimension:
4.0 cm x 1.2 cm x 2.5 cm
[?] cm3
Answer: The volume of given object is 12.0 [tex]cm^{3}[/tex].
Explanation:
Given: Length = 4.0 cm
Width = 1.2 cm
Height = 2.5 cm
Formula to calculate the volume of such an object is as follows.
[tex]Volume = length \times width \times height[/tex]
Substitute the values into above formula as follows.
[tex]Volume = length \times width \times height\\= 4.0 cm \times 1.2 cm \times 2.5 cm\\= 12.0 cm^{3}[/tex]
Thus, we can conclude that the volume of given object is 12.0 [tex]cm^{3}[/tex].
HELPPPP pleaseeeeee!!!!
Answer:
Length=Meter
Mass=Kilogram
Time=Second
Explanation:
Si is the International System of Units and means not just the U.S metric system.
Hope this helps and Please mark as Brainliest
How many moles of sucrose
are in 5.25x1029 sucrose
molecules? (in scientific notation)
Answer:
8.72 × 10^5 moles
Explanation:
To find the number of moles in 5.25 x 10^29 molecules of sucrose, we divide the number of molecules by Avagadro constant (6.02 × 10²³ molecules). That is;
no. of moles = no. of molecules ÷ 6.02 × 10²³ molecules
In this case of sucrose, no of moles contained is as follows;
5.25 × 10^29 ÷ 6.02 × 10²³
5.25/6.02 × 10^ (29-23)
0.872 × 10^6
= 8.72 × 10^5 moles
Se realiza una mezcla de minerales de Cu y Fe: 20 kg FeS2 (pirita), 70 kg de Fe2O3 (hemetita) 15 kg de CuFe2 (calcopirita) y 90 kg de CuO (tenorita). Calcule: Porcentaje de hierro Porcentaje de cu Porcentaje de azufre y oxigeno
Answer:
34.78% Fe
39.66% Cu
5.48% S
20.07% O
Explanation:
Para resolver esta pregunta debemos hallar la masa de cada átomo en cada mineral. Así, podremos hallar el porcentaje de cada átomo:
Pirita (Fe: 55.845g/mol; S: 32.065g/mol; FeS2: 119.975g/mol)
Masa Fe:
20kg FeS2 * (1*55.845g/mol / 119.975g/mol) = 9.31kg Fe
Masa S:
20kg FeS2 * (2*32.065g/mol / 119.975g/mol) = 10.69kg S
Hemetita (Fe: 55.845g/mol; O: 16g/mol; Fe2O3: 159.688g/mol)
Masa Fe:
70kg Fe2O3 * (2*55.845g/mol / 159.688g/mol) = 48.96kg Fe
Masa O:
70kg Fe2O3 * (3*16g/mol / 159.688g/mol) = 21.04kg O
Calcopirita (Fe: 55.845g/mol; Cu: 63.546g/mol; CuFe2: 175.236 g/mol)
Masa Fe:
15kg CuFe2 * (2*55.845g/mol / 175.236 g/mol) = 9.56kg Fe
Masa Cu:
15kg CuFe2 * (1*63.546g/mol / 175.236 g/mol) = 5.44kg Cu
Tenorita (O: 16g/mol; Cu: 63.546g/mol; CuO: 79.545 g/mol)
Masa O:
90kg CuO * (1*16g/mol / 79.545 g/mol) = 18.10kg O
Masa Cu:
90kg CuO * (1*63.546g/mol / 79.545 g/mol) = 71.90kg Cu
Masa Total: 20kg + 70kg + 15kg + 90kg = 195kg
Porcentaje Hierro:
9.31kg Fe + 48.96kg Fe + 9.56kg Fe / 195kg * 100 =
34.78% Fe
Porcentaje Cobre:
5.44kg Cu + 71.90kg Cu / 195kg * 100 =
39.66% Cu
Porcentaje Azufre:
10.69kg S / 195kg * 100 =
5.48% S
Porcentaje Oxígeno:
21.04kg O + 18.10kg O/ 195kg * 100 =
20.07% O
Combination reactions always:
use only one reactant
require oxygen gas
involve an element and an ionic compound
form only one product
Answer:
require oxygen
Explanation:
Angiosperms produce brightly colored blooms and sweet-smelling flowers. Why have angiosperms developed these adaptations? A. to ensure seed dispersal B. to keep predators from eating the plants C. to attract pollinators and help ensure fertilization D. to allow time for seed development
Answer:
C
Explanation:
Angiosperms have developed these adaptations because it attracts pollinators which helps the ecosystem grow.
When the gravimeter was invented.
Answer:
it was invented in 1960
Explanation:
it was descibed as a wooden instrument ideally suited for gravity programmes in areas of limited latitude and temperature variations
A certain element has two naturally occurring isotopes. The atomic mass of isotope 1 (35.4723 % natural abundance) is 184.9529 amu. Determine the atomic mass of isotope 2. The average atomic mass of the element is 186.2071 amu. Do not include units; report answer to 4 decimal places.
Answer:
the value
Explanation:
A 16.4L sample of NO2(S) has a density of 1.89 g/L. What is the mass of the sample NO2(s)?
A) 31.0 grams
B) 14.5 grams
C) 8.68 grams
D) 0.115 grams
Answer:
A. 31.0
Explanation:
Remember the formula [tex]Density = \frac{mass}{Volume}[/tex], or [tex]D=\frac{m}{V}[/tex].
The problem tells us that the density is 1.89 g/L, and that the volume is 16.4 L.(Remember that if the units are in some form of liters, it is volume, similar to how if the units are in grams, it is mass.)
Plug in the numbers for density and volume, and you will get:
[tex]1.89=\frac{m}{16.4}[/tex]
Then, multiply both sides by 16.4 to get:
m = 30.996 g ≈ 31.0 g
Hope this helps!
