Answer:
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Vitamin A is a fat-soluble vitamin and an essential nutrient for humans. It is a group of organic compounds that includes retinol, retinal (also known as retinaldehyde), retinoic acid, and several provitamin A carotenoids (most notably beta-carotene (β-carotene).
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Can someone calculate the percentage of Hydrogen in NaOH?
Answer:
33%
Explanation:
Since there is only 1 particle for each element in the molecule, 100/ by 3 is 33.
Which of the following is in correct order in terms of increasing intermolecular forces?
Answer:
C
Explanation:
I PROMISE you its right :D
Vitamin A has the molecular
formula C20H300. How many
carbon atoms are in
6.02 x 1023 molecules vit A?
Answer: 307.923
Explanation: Im not sure but thats my best guess. :p
If you are required to use 25.00 mL of 0.200 M NaOH for a titration reaction, how many moles of NaOH will you use?
Answer:
0.20 moles is used
Explanation:
molarity =given wt / gm mw ×1000/v(ml)
Which step in a comparative is not included in a descriptive investigation?
Answer:
the answer is a A
Explanation:
Answer:
Compare
Explanation:
Complete the balanced molecular reaction for the following weak acid with a strong base:HNO2(aq) + Ca(OH)2 (aq)
Answer:
[tex]2HNO_2(aq)+Ca(OH)_2(aq)\rightarrow H_2O(l)+Ca(NO_2)_2(aq)[/tex]
Explanation:
Hello.
In this case, considering that the reaction between nitrous acid and calcium hydroxide yield both water and calcium nitrite as a neutralization chemical reaction:
[tex]HNO_2(aq)+Ca(OH)_2(aq)\rightarrow H_2O(l)+Ca(NO_2)_2(aq)[/tex]
As it is not balanced due to the two nitrites at the right, we obtain:
[tex]2HNO_2(aq)+Ca(OH)_2(aq)\rightarrow H_2O(l)+Ca(NO_2)_2(aq)[/tex]
Which means that 2 before the nitrous acid balance both nitrogen and oxygen.
Regards.
What is the molar mass of NaOH?
Answer:
39.99g/mol
Explanation:
Na = 22
O= 16
H = 1
= 40g or 39.99g/mol
Answer: 39.99g/mol
Explanation:
right
who knows this........
Answer:
D
Explanation:
This creates a gap that we call an oceanic trench
:)
Which element requieres the least amount of energy to remove the outermost electron
Answer: Sodium
Explanation: The sodium has only one electron at the outer layer.
Hope this helps! :)
Which process uses the sun's energy to convert water on Earth's surface into water vapor?
Condensation
Evaporation
Precipitation
Transpiration
Answer:
Evaporation
Explanation:
Feel free to give brainliest.
Have an amazing day!
the re-closing of Purine ring in step 11 doesn't consume ATP. Why?
My Answer:
Because the closing of the Purine ring is used to conserve energy all throughout. Purine biosynthesis is a process used to destroy and break down waste without wasting as much energy as some other biological processes.
[tex]Hope\\ this\\ helps![/tex]
Is average atomic mass and atomic mass the same
Answer:
no
Explanation:
The key difference between atomic mass and average atomic mass is that the atomic mass is the mass of an atom, whereas the average atomic mass is the mass of an atom of a particular chemical element calculated by considering isotopes of that element.
50 POINTS
When the temperature of air increases, how does the pressure change?
Assume there is no change in air volume.
1. The pressure decreases
2. The pressure remains the same
3. The pressure increases
Answer:
the pressure in The air increase
A compound contains only Fe and O. A 0.2729 g sample of the compound was dissolved in 50 mL of concentrated acid solution, reducing all the iron to Fe2+ ions. The resulting solution was diluted to 100 mL and then titrated with a 0.01621 M KMnO4 solution. The unbalanced chemical equation for reaction between Fe2+ and MnO−4 is given below.
MnO−4(aq)+Fe2+(aq)→ Mn2+(aq)+Fe3+(aq) (not balanced)
The titration required 42.17 mL of the KMnO4 solution to reach the pink endpoint.What is the empirical fomula of the compound?
Answer:
FeO
Explanation:
The balanced reaction equation is
MnO−4(aq)+5Fe2+(aq)→ Mn2+(aq)+5Fe3+(aq)
Number of moles of KMnO4 reacted = 0.01621 M × 42.17/1000 = 6.84 × 10^-4 moles
Since
1 mole of MnO4^- reacted with 5 moles of Fe^2+
6.84 × 10^-4 moles of MnO4 will react with 6.84 × 10^-4 moles × 5 = 34.2 × 10^-4 moles of Fe^2+
Mass of Fe^2+ reacted = 34.2 × 10^-4 moles of Fe^2+ × 56gmol-1 = 0.192 g of Fe
Hence % of iron in the sample = 0.192/0.2729 × 100 = 70.4%
% of oxygen = (0.2729 -0.192)/0.2729 × 100 = 29.6%
Empirical formula of the compound is obtained by
70.4/56, 29.6/16
1.257, 1.85
Divide through by the lowest ratio
1.257/1.257, 1.85/1.257
1, 1
Hence the empirical formula is FeO
Breyana and her friend found a piece of metal which they want to
identify.Here is what they figure out so far:
Mass of this metal is 37 g
Volume of this metal is 20 cm3
Answer:
The density of beryllium is 1.85 g/cm³. Thus given metal is beryllium.
Explanation:
Given data:
Mass of metal = 37 g
Volume of metal = 20cm³
Which metal is this = ?
Solution:
We will solve this problem by using density formula. After finding density we will check from literature which metal has a density similar to our calculated density.
d = m/v
d = 37 g/ 20cm³
d = 1.85 g/cm³
The density of beryllium is 1.85 g/cm³. Thus given metal is beryllium.
its is possible for a molecule to have a polar bond but have an overall polarity of nonpolar?
By definition
Definition of electronegativityThe electronegativity of an element is defined as the relative ability of an atom to attract electrons from another atom to chemically bond and form a compound.
In other words, electronegativity is a measure of the attractive force that one atom exerts on the electrons of another when a chemical bond forms.
Polarity of a bondThe polarity of a chemical bond occurs when there is an asymmetric distribution of the electron cloud of the bond around the two atoms that form said bond. This happens when both atoms have different electronegativity.
This is, the polarity of a bond is determined by the difference in electronegativity between the atoms that form it.
If the atoms forming the bond have very similar electronegativities, the bond is nonpolar.
On the contrary, if the difference in electronegativity is appreciable, the bond is polar and the electrons are not shared in a balanced way, creating electric dipoles.
Polarity of a moleculeThere are molecules whose bonds are polar and yet the molecules are nonpolar due to their geometry. This causes the dipole moments of the individual bonds to be canceled and, globally, the molecule will be apolar.
That is, the different dipole moments cancel each other out.
AnswerIn summary, its is possible for a molecule to have a polar bond but have an overall polarity of nonpolar.
Learn more about polarity:
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Explore: Natural gas is a mixture of methane (CH4), ethane (C2H6), and other gases. Find two ways that natural gas forms. List the steps of the two carbon pathways below:
Answer:
1. Atmosphere ⇒ Ocean ⇒ Marine Plants ⇒ Sediments ⇒ Natural Gas .
2. Atmosphere ⇒ Land Plants ⇒ Natural Gas.
Explanation:
Hello,
In this case, it is widely known there are two ways in which natural gas is formed:
1. Atmosphere ⇒ Ocean ⇒ Marine Plants ⇒ Sediments ⇒ Natural Gas .
In this one, the carbon dioxide in the atmosphere, is able to get through the ocean and in touch with marine plants which have the capacity to undergo photosynthesis and yield sugars which are subsequently fixated in the soil as sediments containing fossil fuels, coal and/or natural gas.
2. Atmosphere ⇒ Land Plants ⇒ Natural Gas.
In this one, the carbon dioxido also in the atmosphere is captured by the land plants which use it to undergo photosynthesis and subsequently fix it into the underground as fossil fuels, coal and/or natural gas as well.
Best regards.
Natural gas occurs naturally in the atmosphere and includes various forms of gases. Natural gases are formed from the atmosphere through the ocean or land.
What is the carbon cycle?The carbon cycle is the pathway of the formation and its flow in the different spheres of the planet.
The first pathway of the natural gas formation is explained as:
The natural gas or the carbon dioxide from the air or the atmosphere moves towards the ocean and marine plants that use them in the photosynthesis that laters get fixed as sediments in the ocean beds.
The second pathway of the natural gas formation is explained as:
The carbon dioxide from the air moves towards the land and is captured by the plants to use as reactants in process of photosynthesis. The carbon captured by the plant is fixed as fossils in the underground soil.
Therefore, natural gas can be formed by land and oceanic plants.
Learn more about natural gas here:
https://brainly.com/question/21634981
Which of the following types of fingerprints is collected with gray or black powder and fingerprint tape?
fingerprints are collected with gray or black powder and fingerprint tape. These fingerprints are not visible to the naked eye.
Answer:
latent
Explanation: its latent.
Answer:
latent
Explanation:
_____ are most broadly defined as compounds that are electron-pair acceptors.
A: Bases
B: Acids
Answer:
Acids
Explanation:
i tested it and it is acids. hope this helps :)
A salute of hydrochloric acid has a molarity of 4.0m HCL. if a reaction requires 0.73 g of HCl what volume of the solution should be used?
Answer:
Explanation:
Molar weight of HCl is 36.46g/mole
The reaction requires 0.73 g of HCl so it requires
0.73/36.46 = 0.02 mole of HCl
Molarity of HCl is 4.0M = 4mole/liter
0.02/4 = 0.005L = 5mL
5 mL of HCl solution should be used.
Susan and her friend found a piece of metal which they want to
identify.Here is what they figure out so far:
Mass of this metal is 74 g
Volume of this metal is 40 cm3
Answer:
The given metal is beryllium.
Explanation:
Given data:
Mass of metal = 74 g
Volume of metal = 40 cm³
Which metal is this = ?
Solution:
First of all we will calculate the density.
it is mass divided by volume.
d = m/v
d = 74 g/40 cm³
d = 1.85 g/cm³
In literature it is given that the density of beryllium is 1.85 g/cm³. Thus given metal is beryllium.
how many hydrogen atoms would be present in 12 molecules of water( H2o)?
3
2
24
12
Answer:
Don't know if the answer is correct or not.
There will be 24 atoms of hydrogen
Explanation:
for H2O there is 2 atoms
Therefore:
12×2=24
What is the charge on an electron?
-1
0
+1
+2
Answer:
-1
Explanation:
Proton +1
Neutron 0
Electron −1
The energy produced by the sun and stars comes from ________.
mechanical energy
nuclear fission
nuclear fusion
i'll mark brainliest
Answer:
nuclear fission
Explanation:
Fission is the act of energy cells splitting give brainliest please
How many moles in 4 g of Ca3N2?
.027 mol
.613 mol
2.05 mol
.760 mol
Answer:
0.027mole
Explanation:
What do you think would happen to the Earth’s energy balance if the concentration of greenhouse gases increase
Answer:
rise to an imbalance in Earth's energy budget
Explanation:
Increased atmospheric greenhouse gas concentrations give rise to an imbalance in Earth's energy budget by initially reducing the amount of emitted thermal infra-red radiation. The result of this imbalance is an accumulation of excess energy in the Earth system over time.
Answer:
Increased atmospheric greenhouse gas concentrations give rise to an imbalance in Earth's energy budget by initially reducing the amount of emitted thermal infra-red radiation. The result of this imbalance is an accumulation of excess energy in the Earth system over time.
Explanation:
hope it helps you
7. What are the correct coefficients in order for the equation to be balanced?
Explanation:
I hope you benefit
this is the correct coefficient...
The recommended single dose for acetaminophen is 10.0 to 15.0 mg/kilograms of body weight for adults. Using this guideline calculate the maximum single dosage for a person who weighs 197 pounds
163 lb * 1 kg / 2.205 lb * 15.0 mg/kg = 1108.8 mg or about 1.11 g
. A room temperature white solid is mixed with a room temperature clear liquid resulting in a clear, colorless liquid that is hot to the touch. Has a chemical reaction occurred? Why or why not? (It may be possible to argue in favor of yes OR no. Defend YOUR answer.)
Yes, the chemical reaction occurs because new substance is formed and heat energy is released.
What is chemical reaction?Chemical reaction is a process in which one or more substances i.e. the reactants, are converted to one or more different substances i.e. the products so we can conclude that the chemical reaction occurs because new substance is formed and heat energy is released.
Learn more about chemical reaction here: https://brainly.com/question/11231920
Ateacher wants to figure out the amount of a solution that is needed for a litration experiment in a class lab. The dass
has 15 students, and each experiment needs 50 ml. of solution
If each student will perform the experiment two times, how many ml of solution will the teacher need for the whole
class?
O 375 ml
750 ml
1500 ml
3000 ml
Answer:
750 ml
Explanation:
Given parameters:
Number of students in the class = 15
Volume of solution needed per student = 50ml
Unknown:
Volume of solution needed for the whole class = ?
Solution:
The total volume needed for the class;
= number of students x volume of solution per student
= 15 x 50
= 750ml
The volume of solution needed by the teacher for the whole class is 750mL