Answer:
D
Explanation:
D as being a medical doctor requires you to have studied chemistry and aslo hair-colouring technician as you would need to understand chemicals and such to create such a thing
Select the correct structure that corresponds to the name.
3,3-dimethylcyclopentene
Answer:
See image
Explanation:
what is photosynthesis ?
Answer:
the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
Explanation:
basically when plants make food for themselves
Answer:
photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.Explanation:
hii are you also from India ¯\_(ツ)_/¯Please help me :(
How many atoms are present in 179.0 g of iridium?
A. 6.464x10
B. 1.157x10
C. 5696x10
D. 1078 x 10
Answer: There are [tex]5.696 \times 10^{23}[/tex] atoms present in 179.0 g of iridium.
Explanation:
Given: Mass = 179.0 g
Moles is the mass of a substance divided by its molar mass. So, moles of iridium (molar mass = 192.217 g/mol) is as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{179.0 g}{192.217 g/mol}\\= 0.931 mol[/tex]
According to the mole concept, 1 mole of every substance contains [tex]6.022 \times 10^{23}[/tex] atoms.
Therefore, atoms present in 0.931 moles are calculated as follows.
[tex]0.931 mol \times 6.022 \times 10^{23} atoms/mol\\= 5.696 \times 10^{23} atoms[/tex]
Thus, we can conclude that there are [tex]5.696 \times 10^{23}[/tex] atoms present in 179.0 g of iridium.
a thermometer is used to measure which of the following?
A.The kinetic energy of the molecules in a substance
B.The potential energy a solution has
C. The density of a fluid
D.All of the above
Answer:
c. i hope im not wrong hmmm
I need help, please. ASAP anyone willing to help a port innocent child like me
Answer:
Kₑq = [H₂]² [O₂] / [H₂O]²
Explanation:
We'll begin by defining equilibrium constant for a reaction. This is given below:
The equilibrium constant for a given reaction is defined as the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient.
With the above information in mind, we shall determine the equilibrium constant for the reaction given in the question above. This is illustrated below:
2H₂O (g) <=> 2H₂ (g) + O₂ (g)
Kₑq = [H₂]² [O₂] / [H₂O]²
Dãy các chất tác dụng với nước ở nhiệt độ thường là
A. SO2, BaO, Mg.
B. Na2O, P2O5, K.
C. SO3, BaO, Fe.
D. CaO, BaO, Fe
Look at the picture to answer please!!
Need help asp :))
for a clear understanding of how closely they are related, scientists compare their DNA, an essential molecule that's the instruction manual for building each species. Humans and chimps share a surprising 99 percent of their DNA.
Why do avocados brown?
Explanation:
bc they are avocado.. and brown
what is chemical reaction
When two ice skaters initially at rest push off one another, their final
momenta are..."
Answer:B
Explanation:
Given the equilibrium reaction at constant pressure:
2HBr(g) + 17.4 kcal — H2(g) + Br2(g)
When the temperature is increased, the equilibrium will shift to the
A Right, and the concentration of HBr(g) will increase
B Left, and the concentration of HBr(g) will decrease
C Right, and the concentration of HBr(g) will decrease
D) Left, and the concentration of HBr(g) will increase
Answer: C Right, and the concentration of HBr(g) will decrease
Since it is an endothermic reaction the equilibrium will shift to the right direction i.e. product side decreasing concentration f HBr.
In the case when the temperature is increased so here the equilibrium should be shifted to the right and the concentration of HBr(g) will decrease.
Impact on increase in temperature:The given reaction represent the endothermic reaction since it absorb the heat.
So in the case when there is endothermic reaction so here there should be increase in temperature since the reaction should goes forward direction and the concentration of HBr(g) will decrease.
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In which of the following substances do you find strong hydrogen bonding?
A hydrogen sulphide
B liquid ammonia
D hydrogen gas
C hydrochloric acid
Answer:
The strength of an individual H bond depends on the polarity of the H-X bond and therefore on the electronegativity of X ( the more delta positive the H atom, the stronger the electrostatic force of attraction between it and a lone pair of electrons). Thus, on a per bond basis, HF H bonding is strongest. However, as water has two H atoms, each molecule can form two H bonds so on a per molecule basis, water H bonding is strongest (this is evidenced by the boiling points of the three substances; NH3 < HF < H2O.)
Explanation:
Correct me if I'm wrong
Concentrations-
A student dissolves 5.62 grams of magnesium Sulfate, MgSO4, in 100.0 ml of distilled water. What is the molarity of this solution?
If possible, provide work.
100 POINTS !! "IMAGE INCLUDED" I NEED HELP WITH THIS PLEASE
Answer:
Explanation:
Factor 1 is amount of sunlight as it provides energy for photosynthesis; the process in which the energy storage molecules are produced.
Factor 2 is amount of carbon dioxide as it is the reactant, along with water, which is converted through photosynthesis into energy storage molecules, glucose.
Answer:
Explanation:
1 - sun light cuz' its energy source 4 photosynthesis which produces the energy storage molecules
2 - CO2 n H2O cuz' they react during photosynthesis to produce energy storage molecules
Calcular la cantidad de NaOH necesaria para preparar medio litro de disolución 2,5 N. (Dato: peso molecular del NaOH = 40 g/mol).
Answer:
The amount of NaOH required to prepare a solution of 2.5N NaOH.
The molecular mass of NaOH is 40.0g/mol.
Explanation:
Since,
NaOH has only one replaceable -OH group.
So, its acidity is one.
Hence,
The molecular mass of NaOH =its equivalent mass
Normality formula can be written as:[tex]Normality=\frac{mass of solute NaOH}{its equivalent mass} * \frac{1}{volume of solution in L} \\[/tex]
Substitute the given values in this formula to get the mass of NaOH required.
[tex]2.5N=\frac{mass of NaOH}{40g/mol} *\frac{1}{1L} \\mass of NaOH=2.5N*40gmol\\ = 100.0g[/tex]
Hence, the mass of NaOH required to prepare 2.5N and 1L. solution is 100g
The Copper Chloride solution used in the investigation contained 300 grams per dm3 of solid CuCl2 dissolved in 1dm3 of water.
The student used 50cm3 of copper chloride solution in each experiment. Calculate the mass of solid copper chloride used in each experiment.
Answer:
The mass of solid copper chloride used in each experiment=15 g
Explanation:
We are given that
Mass of copper chloride in solution=300g/dm3
Volume of solution used in each experiment=50 cm3
We have to find the mass of solid copper chloride used in each experiment.
[tex]1cm^3=0.001 dm^3[/tex]
[tex]50cm^3=0.05 dm^3[/tex]
1 dm3 contained solid copper chloride=300 g
0.05 dm3 contained solid copper chloride=[tex]300\times 0.05[/tex]g
0.05 dm3 contained solid copper chloride=15 g
Hence, the mass of solid copper chloride used in each experiment=15 g
Biggest oil fields in the world?
Answer:
Ghawar field location-Saudi Arabia
Burgan Field location-Kuwait
Ahvaz field location-Iran
Upper Zakum Oil Field Location-Abu Dhabi UAE
Explanation:
I learned this yesterday :D
An organism with 44XY chromosome
Answer:
Rabbit,Dolphin
Explanation:
There are more organism of 44 cromosomes.
which of the following element is not in group vii of the periodic table
Answer:
Oxygen group element, also called chalcogen, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv). ... Modern version of the periodic table of the elements (printable).
II. Which statement seems more likely to be true?
A.
Double replacement reactions are always neutralizations.
B.
Neutralizations are always double replacement reactions.
Answer:
B
Explanation:
Neutralisations are always double replacement reactions
Which of the following is the best example of a physical system?
a) A city
b) A school
c) A hospital
d) A television
(15 points no links ) (also this is a serious question please excuse any somewhat offensive language)What are the specialized structures in the body that produce sex cells? a. Eggs c. Gonads b. Sperm d. Chromatin Please select the best answer from the choices provided A B C D
the answer is C . GONADS.
PLEASE HELP ME
How are the electron structures of hydrogen (H) and lithium (Li) similar?
A. They both have 1 electron in an s sublevel.
B. Neither one has any valence electrons.
C. They both have valence electrons in the 1s sublevel.
O D. They both have valence electrons in the first main energy level.
The electron structures of hydrogen (H) and lithium (Li) are similar as " they both have 1 electron in an s sublevel".
What is sub-level?The quantum theory defines a sublevel as an energy level. Sublevels in chemistry refer to the energy caused by electrons. Sublevels can also relate to energy caused with the nucleus in physics.
It is know that the atomic number of hydrogen is 1 and the atomic number of lithium is 3.
The electronic configuration of H = [tex]1s^{1}[/tex].
The electronic configuration of Li = [tex]1s^{2} 2s^{1}[/tex].
Its can be seen that hydrogen and lithium both posses 1 electron in s sublevel
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I NEED HELP, PLZZ
When a basketball player makes a bounce pass to another player, the bounce height is lower for each subsequent bounce and the energy of the ball decreases. What is the main reason that the bounce height decreases?
A. The energy from the pass has been destroyed.
B. The energy from the pass has been conserved.
C. The energy from the pass has been transferred to the floor.
D. The energy from the pass has been transformed into horizontal motion.
Answer:
d
Explanation:
Calorimetry can be used to determine the specific heat capacity of an unknown substance.
True
False
Answer:
TRUE
Explanation:
Main job of calorimeter is to measure energy changes or determine specific heat capacity of different substances. Specific heat is an intensive property (like density, color, etc.) that does not depend on the amount of a substance present. This allows substances to be identified using their specific heat. Thus, calorimeter comes very handy in determining the specfic heat of unknown substance.
Aluminum and cloride undergoes a synthesis reaction if 8molnof Al reacts with 10mol of cl, what is the maximum amount of AlCl3 can produce
Answer: The mass of [tex]AlCl_3[/tex] produced is 889.38 g
Explanation:
We are given:
Moles of Al = 8 mol
Moles of [tex]Cl_2[/tex] = 10 mol
For the given chemical reaction:
[tex]2Al+3Cl_2\rightarrow 2AlCl_3[/tex]
By stoichiometry of the reaction:
If 3 moles of chlorine gas reacts with 2 moles of Al
So, 10 moles of chlorine gas will react with = [tex]\frac{2}{3}\times 10=6.67mol[/tex] of Al
As the given amount of Al is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.
Thus, chlorine gas is considered a limiting reagent because it limits the formation of the product.
By the stoichiometry of the reaction:
If 3 moles of [tex]Cl_2[/tex] produces 2 mole of [tex]AlCl_3[/tex]
So, 10 moles of [tex]Cl_2[/tex] will produce = [tex]\frac{2}{3}\times 10=6.67mol[/tex] of [tex]AlCl_3[/tex]
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
We know, molar mass of [tex]AlCl_3[/tex] = 133.34 g/mol
Putting values in above equation, we get:
[tex]\text{Mass of }AlCl_3=(6.67mol\times 133.34g/mol)=889.38g[/tex]
Hence, the mass of [tex]AlCl_3[/tex] produced is 889.38 g
what is the chemical formula for Mg2+ and I1- ( magnesium and iodine)
Answer:MgI2
Explanation:
URGENT!!!
A solution has a [H3O+] of 1 × 10−5 M. What is the [OH−] of the solution? (5 points)
9 M
14 M
1 × 10−9 M
1 × 10−14 M
Answer:
[tex]{ \bf{from \: ionic \: product \: of \: water : }} \\ { \boxed{ \tt{k _{w} = [H _{3} O {}^{ + } ][OH {}^{ - } ]}}} \\ \\ { \tt{1 \times {10}^{ - 14} = (1 \times {10}^{ - 5} ) [OH {}^{ - } ]}} \\ \\ { \tt{[OH {}^{ - } ] = 1 \times {10}^{ - 9} }} \: M[/tex]
A solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.
What is [OH−] of the solution?The water is made up of H2O only and when the pH of it is 7 then the concentration of all the ions would be the same while dissociation the water will get dissociate into H+ ions and OH- ions.
The concentration of OH- ions will be
OH- = Kw {H3O+}
{H3O+} = 1 × 10−5 M.
Kw = 14
substituting the value in the equation,
OH = 14 { 1 × 10−5 M.}
OH = 1 × 10−9 M
Therefore, the solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.
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the structure of butanoic acid
answer on here fjchcjfjdnc.com
Air is a solution of gases, what is the solvent in air?