Answer:
Isotopes
Explanation:
Isotopes are atoms of the same element that contain an identical number of protons, but a different number of neutrons. Despite having different numbers of neutrons, isotopes of the same element have very similar physical properties.
Now molecules: Choose... molecules of H 2 + Choose... molecules of O 2 → Choose... molecules of H 2 O
Answer:
2 H2 + 1 O2 → 2 H2O
Explanation:
How many orbitals are in the subshell with the following quantum numbers: n=4,l=2,ml=−2,−1,0,1,2?
Select the correct answer below:
A. 1
B. 3
C. 5
D. 7
what is biopolymer ?
Answer:
Biopolymers are natural polymers produced by the cells of living organisms. Biopolymers consist of monomeric units that are covalently bonded to form larger molecules. There are three main classes of biopolymers, classified according to the monomers used and the structure of the biopolymer formed: polynucleotides, polypeptides, and polysaccharides.
Explanation:
i need ur help guys please. 50 pts
Answer:
Sodium Chloride - Food flavoring, preservation and desiccation, fermentation processes, wood pulp bleaching in paper industry, buna and neoprene production in plastic industry.
Sodium Hydroxide - Bar soap and detergent production, drain cleaning, paper manufacturing, purification of bauxite ore prior aluminium production, artificial fibers production, oil refining.
Sodium Carbonate - Glass manufacturing, water softening, food additive, soap manufacturing, antiacid production.
Sodium Sulphate - Drugs for therapeutical use, wood pulp production in paper industry, soap and detergent production.
Potassium Nitrate - Fertilizer production, rocket propellant and gunpower production, wastewater treatment.
Potassium Chlorate - Oxygen-supply systems in aerospace applications.
Potassium Permanganate (VII) - Treatments of fungi and bacterial infections, wasterwater treatment and gastric irrigation.
Potassium Chloride - Hypoalkemia treatment, flavor enhancing in food.
Explanation:
Sodium Chloride - Food flavoring, preservation and desiccation, fermentation processes, wood pulp bleaching in paper industry, buna and neoprene production in plastic industry.
Sodium Hydroxide - Bar soap and detergent production, drain cleaning, paper manufacturing, purification of bauxite ore prior aluminium production, artificial fibers production, oil refining.
Sodium Carbonate - Glass manufacturing, water softening, food additive, soap manufacturing, antiacid production.
Sodium Sulphate - Drugs for therapeutical use, wood pulp production in paper industry, soap and detergent production.
Potassium Nitrate - Fertilizer production, rocket propellant and gunpower production, wastewater treatment.
Potassium Chlorate - Oxygen-supply systems in aerospace applications.
Potassium Permanganate (VII) - Treatments of fungi and bacterial infections, wasterwater treatment and gastric irrigation.
Potassium Chloride - Hypoalkemia treatment, flavor enhancing in food.
Nepal is rich in species diversity why?? Explain with any three reason. Help this beginer out !!!
Answer:
Nepal is a multilingual, multiethnic, multicultural and multi-religious nation. Unity in diversity is the defining characteristics of Nepali society. Mutual coexistence, tolerance and cooperation have guided the people in achieving social cohesion, peace and happiness.
Explanation:
Please mark as brainliest!
Where does photosynthesis occur in a plant cell? In what part of a plant cell does photosynthesis occur?
Explanation:
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll.
Answer:
chloroplasts
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll
Explanation:
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
Need Help Asap How do islands form
Explanation:
An island is formed when magma builds up and breaks the ocean's surface. In some cases, like the island of Hawaii, land masses merge together. ... For many volcanoes, formation can take thousands of years, though some volcanic islands can sometimes appear quite suddenly
Answer:
As volcanoes erupt, they build up layers of lava that may eventually break the water's surface. When the tops of the volcanoes appear above the water, an island is formed.
Explanation:
In your own words, explain Earth's atmosphere.
Answer:
yes
Explanation:
because the atmosphere is the shield of earth
write the ground state electronic configuration of an atom having atomic mass number 37 and number of neutrons 20.
Answer: The ground state electronic configuration of an atom having atomic mass number 37 and number of neutrons 20 is [tex]1s^22s^22p^63s^23p^5[/tex]
Explanation:
Atomic number is equal to the number of protons.
Mass number is the sum of number of neutrons and number of protons.
Mass number = number of neutrons + number of protons
37 = 20 + number of protons
number of protons = 17
The atomic number is specific to an element, and the element with atomic number 17 is chlorine.
Electronic configuration represents the total number of electrons that a neutral element contains.
[tex]Cl:17:1s^22s^22p^63s^23p^5[/tex]
What does the reaction rate measure?
Answer:
It's C
Explanation:
cuz im goated
How many moles are in sample containing 2.71 x 10^24 atoms of iron?
Answer:
4.5 moles
Explanation:
One mole is equal to 6.022 x 10^23 atoms
2.71 x 10^24 atoms * 1 mol/ 6.022 x 10^23 atoms = 4.5 moles
if an element number has a mass number of 244 and an atomic number of 94, how many neutrons does the element have
Can someone help me with my stoichiometry homework, it is due tonight.
Answer:
1. 1 mole of NaCl.
2. 1 mole of H₂O.
Explanation:
The balanced equation for the reaction is given below:
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
1 mole of HCl reacted with 1 mole of NaOH to produce 1 mole of NaCl and 1 mole of H₂O.
Next, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above, we can see that 1 mole of HCl reacted completely with 1 mole of NaOH. Therefore, HCl is the limiting reactant and NaOH is the excess reactant since we have 3.6 moles of NaOH.
1. Determination of the amount of NaCl produced from the reaction.
NOTE: The limiting reactant is used to determine the maximum amount produced since all of it is consumed in the reaction.
The limiting reactant is HCl and the amount of NaCl produced can be obtained as follow:
From the balanced equation above, we can see that 1 mole of HCl reacted to 1 mole of NaCl.
Thus, 1 mole of NaCl was produced.
2. Determination of the amount of H₂O produced from the reaction.
From the balanced equation above, it is evident that 1 mole of HCl reacted to produce 1 mole of H₂O.
Thus, 1 mole of H₂O was produced.
BRAINLIEST AND POINTS!!
Describe three ways in which scientists communicate the results of their work.
Answer:
There are several ways that scientists communicate our results, including written reports and scientific journal publications, and by giving presentations to our colleagues and the public. One popular venue for scientists to present to colleagues is at scientific conferences.
Explanation:
Answer:
-Good writing explaining their data they have discovered
-Their research is shared with the other scientists, and is peer reviewed
-They present their results at national and international conferences where other scientists can listen and give their input.
Explanatio
true or false: the more matter a star contains,the longer it is able to shine.
Pls help fast
Explanation:
true ..........................
Magnesium is the limiting reactant in this experiment: Calculate the theoretical yield of MgO for each trial. Determine the percent yield of MgO for each trial. Determine the average percent yield of MgO for both trials.
Answer:
how do u want me to do this
Explanation:
A chemist determined by measurements that 0.050 moles of tin participated in a chemical reaction. Calculate the mass of tin that participated in the chemical reaction.
Be sure your answer has the correct number of significant digits.
Answer:
Explanation:
MM of I2 = 2 (127 g) = 254 g/mol
0.065 mol I2 x 254g I₂/ 1 mol I₂ = 16.5 g I2
What does the illustration indicate?
Answer: A
Explanation:
What is the molarity of a 300.0 mL solution containing 25.0 g of NaCl?
Answer:
1,43 M
Explanation:
molair mass NaCl = 58,44 g/mol
You need to calculate how many moles 25 g is:
25 g / 58,44 g/mol = 0,4278 mol
0,4278 mol / 0,3 L = 1,43 M
An Advil® cold and sinus capsule has a volume of 210. Mm3. How many microliters (µL) of the drug are needed to fill the capsule? ( 1 L = 106 µL)
Answer:
210 microliters of drug are needed to fill the capsule
Explanation:
As given in the question
1 liter is equal to [tex]10^6[/tex] micro liters
Volume of Capsule [tex]= 210[/tex] cubic millimeter
1 cubic millimeter [tex]= 10^{-3}[/tex] cubic meter
1 cubic meter [tex]= 10^3[/tex] liters
1 micro liter [tex]= 10^{-6}[/tex] micro liters
Converting [tex]210[/tex] cubic millimeter to micro liter
[tex]= 210 * (10^{-3})^3 * 10^3 \\= 210 * 10^{-6}\\= 210[/tex]micro liters
Do temperature and air pressure change in a smooth, gradual way as your balloon flies higher?
Answer:
yes ?
Explanation:
from what I have learned so far, the hair gradually gets thinner and thinner with less oxygen which would change the pressure
Denise was driving east over a hill in the afternoon, shortly after a rain shower. Suddenly the sun broke through the clouds, and she saw a rainbow ahead of her. Which of the following made the rainbow possible?
Answer: A. Raindrops act like a prism and separate the white light in sunlight.
Explanation:
The reason for the formation of rainbow is option A. Raindrop acts like a prism and separate the white lite into different colors.
What is rainbow?Rainbow is an arc of colors from a white light ray which can be formed by the separation of component colors from white light by the combination of reflection, and refraction.
White light absorbs all colors and reflect all of them. That is why a white object is seen white the mix of all colors. When the white light passes through a raindrop, it gets refracted, the refracted light then reflects from the drop and undergo one more refraction and that make the component colors in the form a bent or arc.
Therefore, raindrop is acting like a prism to separate the white light into its component colors. Hence, option A is correct.
Find more on rainbow:
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.
Please help!!
You have 5 moles of marbles. How many marbles is this?
Answer:
The answer is 3.011x^24 marbles
Explanation:
6.022 x 10^23 x 5 = 3.011 x 10^24
how many mongo seed are equal to 3.50 moles of mongo seeds?
answer:
2.107 x 10^24 mongo seeds
Answer:
50 moles of many mango seeds = 2.107.10²⁴ mango
Further explanation
A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12
While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule
With Avogadro's number
N = number of gas particles
No = Avogadro number (6.02.10²³)
n = number of moles
n= N/No
3.50 moles of many mango seeds are comparable to
N mango seeds= 3.5 x 6.02.10²³
N mango seeds=2.107 x 10²⁴..
How many carbon atoms are there in a 12.5 kg sample of carbon?
step by step solution
Answer:
6.27 X 10^26 atoms
Explanation:
Write down the formula:
number of moles = mass/Ar (Ar is atomic mass)
Ar of carbon = 12
mass = 12.5kg or 12500g
Substitue these values into the formula:
number of moles = 12,500g / 12 = 3125/3 or 1041.6
Convert this to atoms:
1 mole = 6.022 X 10^23 atoms
So, 1041.6 moles = 6.27 X 10^26 atoms
How many hydrogen ATOMS are needed to produce 2 water (H2O) molecules? HINT: ATOMS not molecules
Answer:
Just 4...
Explanation:
There are 2 hydrogen atoms in 1 water molecule, so in 2 water molecules would have 4 hydrogen atoms.
*booyah*
If we had 79.3 grams of Xe, would we expect a volume that is
greater than or less than that obtained with neon?
a
Greater than
b Equal
с
Less than
Answer:less than
Explanation:
If we had 79.3 grams of Xe, we would expect a volume that is less than obtained with neon. So, the correct option is (C).
What is Density?Density is defined as the mass per unit volume of a substance. The most commonly used symbol for density is ρ, although the Latin letter d can also be used. Density is defined as mass divided by volume:
[tex]{\displaystyle \rho ={\frac {m}{V}}}[/tex]
where ρ is density,
m is mass, and
V is volume.
The mass contained per unit volume of an object is known as density. where the SI unit of density is kilogram per cubic meter [tex](kg/m^3).[/tex] Density is inversely proportional to volume, so the density of Xenon is [tex]5.894 kg/m^3[/tex] while the density of neon is 0.89994 kg/m³. So, if density is more than volume will be less and vice versa. In this case, density of Xenon is more as compare to neon so, the volume of neon will be more.
Thus, if we had 79.3 grams of Xe, we would expect a volume that is less than obtained with neon. So, the correct option is (C).
Learn more about Density, here:
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Please help with this question!
Answer:
The answer is 1:1
Explanation:
How many electrons are needed in the outer energy levels of most atoms to be chemically stable?
Answer:
8 electrons
Explanation:
Determine whether each change represents oxidation or reduction. 1) CH3CHO to CH3CH2OH 2) CH3OH to CH4 3) N2H4to N2 4) gain of electrons 5) NO-2 to NH3 6) NAD+ to NADH 7) CH4 to Co2 8) Ag+ to Ag
Answer:
1) oxidation
2) Reduction
3) Oxidation
4) Reduction
5) Reduction
6) Reduction
7) Oxidation
8) Reduction
Explanation:
Oxidation is said to have taken place when there is a positive change in the oxidation number while reduction is said to have taken place when there is a decrease in the oxidation number.
The change from CH3CHO to CH3CH2OH represents on oxidation reaction.
The change from CH3OH to CH4 is a reduction because the oxidation number of carbon changes from +2 to -4.
The change from N2H4to N2 is an oxidation because the oxidation number of nitrogen increases from -2 to 0.
The gain in electrons is a reduction because the gain of electron leads to a decrease in oxidation number.
The change from NO- 2 to NH3 is a reduction because the oxidation number of nitrogen changes from +4 to -3.
The change from NAD+ to NADH is a reduction since NAD+ is the oxidized form of the enzyme while NADH is the reduced form of the enzyme.
The change from CH4 to Co2 is an oxidation because the oxidation number of carbon changes from -4 to + 4.
The change from Ag+ to Ag is a reduction because it involves the gain of one electron and a consequent decrease in oxidation number.
