Explanation:
a) 0.4998 mol
b) 0.249 mol
Analyses of mutations show they only result in variations in?
Answer:
Genetic variation
Explanation:
measure of the genetic differences that exist within a population.
Select the correct answer from A, B, C, D & E for each statement given below:
A: Anthracite B: Diamond
C: Carbogen D: Urea E: Lampblack
1. An allotrope of carbon used as a tip for deep boring drills.
2. The type of coal with the highest carbon content.
3. An allotrope of carbon, obtained by burning kerosene oil in a limited supply of air.
4. A nitrogenous fertilizer obtained from carbon dioxide.
5. A compound which finds use for a victim of carbon monoxide poisoning.
Answer:
Didn't know the answer, sorry.
True or false: An atom’s valence electrons are those electrons that have the highest energy.
Answer:
False
Explanation:
Valence electrons depend of their what group they're in.
Answer: false
Explanation:
Because I looked it up
Which group of elements can act as semiconductors?
Answer:
metalloids
Explanation:
I think that is the answer
According to the electronic configuration, group 14 of elements can act as semiconductors.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Materials that allow electricity to flow through them easily are called conductors which of these would be a good conductor of electricity?
Group of answer choices
Carbon
Steel
Rubber
Plastic
N2+3H2=>>2NH3. If 6.72dm³ of each of Nitrogen and hydrogen (measured at S.T.P.) are made to produced Ammonium. Which of the reacted will be in excess and by how many moles?
Answer:
Hydrogen, 0,2 mol
Explanation:
[tex]V_{M}[/tex] = 22, 4 l/mol
V ([tex]N_{2}[/tex]) = 6,72 [tex]dm^{2}[/tex] = 6,72 l
V ([tex]H_{2}[/tex]) = 6,72 [tex]dm^{2}[/tex] = 6,72 l
The formula is:
n = [tex]\frac{V}{V_{M} }[/tex]
n ([tex]N_{2}[/tex]) = 6,72l /22,4 l/mol = 0,3 mol
n ([tex]H_{2}[/tex]) = 6,72l /22,4 l/mol = 0,3 mol (the same)
But from the equation we get a proportion that 1 mol ([tex]N_{2}[/tex]) - 3 mol ([tex]H_{2}[/tex])
[tex]\frac{0,3}{1} > \frac{0,3}{3}[/tex] (we have more hydrogen than is need for the reaction)
So there is excess of [tex]H_{2}[/tex]
We only need [tex]\frac{0,3}{3}[/tex] = 0,1 mol ([tex]H_{2}[/tex])
0,3 mol (hydrogen quantity we have) - 0,1 mol (hydrogen quantity we need for the reaction) = 0,2 mol (excess)
make me the brainliest
why does aluminium form at negative electrode during electrolysis
Answer:
The negative electrodes (cathodes ) and the positive electrodes (anodes ) are made of graphite, a form of carbon. During electrolysis: positively charged aluminium ions gain electrons from the cathode, and form molten aluminium. oxide ions lose electrons at the anode, and form oxygen molecules.
(EASY POINTS!!!!!!!!!!!!!!!)How do we change the world... one random act of kindness at a time
Answer:
less polution
Explanation:
describe Transpiration
Answer:
is the process of water movement through a plant and its evaporation from aerial parts, such as leaves stems and flowers.
Answer:
well in easy terms... its just like the loss of water from the leaves or other parts of a plant due to evaporation
Explanation:
Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism.
If a string of Christmas lights goes out entirely when one light bulb burns out, the bulbs are connected in parallel with each other.
True
or
False
Answer:
False
Explanation:
A series circuit is one that is all connected
Given 35.0 grams of aluminum at 22.0 °C. What will be the final temperature of the Al if 300.0 joules of heat energy is added to the Al? (The specific heat of Al is 0.217 cal/g°C)
What is the primary intermolecular force the exist between molecules of carbon tetrachloride?
Answer:
Carbon tetrachloride is non-polar and so the only kind of force that can exist is induced dipole.
2. Many calculations in chemistry will involve certain symbols, such as the symbol triangle or delta
What does this symbol stand for or mean?
A. "The total"
B. "The change in"
C. "The unit"
D. "The formula"
B. "The change in"
I saw that symbol a lot in chemistry and physics so I immediately recognized it.
Which environmental conditions contribute most to the spread of bacteria?
O A. cold temperatures and low humidity
B. warm temperatures and low humidity
oc, cold temperatures and high humidity
O
D. warm temperatures and high humidity
URGENT!
(a) A gas' pressure is 765 torr at 296k. At what temperature will the pressure be 560. torr?
(b) Which gas law is being represented above?
Boyle's Law, Charle's Law, Gay-Lussac's Law?
Answer !BOTH! questions.
Answer:
GAY-LUSSAC'S LAW.
Explanation:
P1 = 765 torr
T1 = 23°C = 296K
P2 = 560. torr
T2 = ?
(765 torr)/(296K) = (560. torr)/ T2
T2 = 226 K = -57°C
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore the new temperature is -57°C. the law that is used over here is Gay-Lussac's Law.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Ideal gas is only for ideal gas.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
P1 = 765 torr
T1 = 23°C = 296K
P2 = 560. torr
T2 = ?
Applying Gay-Lussac's Law
(765 torr)/(296K) = (560. torr)/ T2
T2 = 226 K = -57°C
Therefore the new temperature is -57°C. the law that is used over here is Gay-Lussac's Law.
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High solubility of ammonia in water what type of interaction is responsible for?
Answer:
The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).
Answer:
Hydrogen Bonding
Explanation:
The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).
hello, if you can please help!
Answer:
A: False
Explanation:
B: True
C: part of earths mantle.
describe the relationship between kinetic energy and mass
Answer:
Kinetic energy has a direct relationship with mass, meaning that as mass increases so does the Kinetic Energy of an object. ... Objects with greater mass can have more kinetic energy even if they are moving more slowly, and objects moving at much greater speeds can have more kinetic energy even if they have less mass
Elements can be described by various properties, and identified by their boiling and melting points. For example, gold melts at 1,064ºC and boils at 2,856ºC. Does boiling point depend on the mass present?
A. No; chemical properties stay the same regardless of mass.
B. No; physical properties stay the same regardless of mass.
C. Yes; physical properties can change when mass increases or decreases.
D. No; qualitative properties like boiling point stay the same regardless of mass.
Answer:
Explanation:
Melting and boiling point variations are not clear (do not have uniform pattern) in periodic table. But we can see, some elements have higher melting and boiling points and some have less. Here we study melting and boiling points of s, p, d blocks elements. IVAth group elements (C,Si) show high melting and boiling points because they have covalent gigantic lattice structures.
When a molecule is separated into its components parts it form
A. Componds
B. Atoms
C. Protons
D. Ions
When a molecule is separated into its components it forms atoms as molecules are made up of same or different kind of atoms.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Which of the following is NOT a way unbalanced forces can cause an object to change its motion?
A. changing the object's direction
B. stop the obect from moving
C. the object's motion stays constant
D. start the object moving
How are air resistance and friction similar?
A. They are both noncontact forces.
B. They are both types of nuclear forces.
C. They both slow things down.
D. They both work using gravity.
7. Put the following elements in order from smallest to largest atomic radius and explain
why:
C.0, Sn, Sr
Answer:
O, C, Sn, Sr
Explanation:
As per the periodic table trends, atomic radius of an atom deceases from left to right and increases down a group this is so because across a period or from left to right, number of protons increases that increases the nuclear charge and nuclear radius decreases. Down the group, atomic radius increases because energy level increases and distance between nucleus and outermost orbital increases.
The elements in order from smallest to largest atomic radius are:
O, C, Sn, Sr because as per the periodic table trends, oxygen (O) fall into right side of Carbon (C) in the periodic table and Strontium (Sn) and Tin (Sn) fall into down the group where Tin (Sn) is on the right side of Strontium (Sn).
Hence, the correct order is "O, C, Sn, Sr".
After mixing equal amounts of the two molecules, the solution achieved equilibrium at 25 ∘ C . 25 ∘C. The concentration at equilibrium of glucose 1‑phosphate is 0.01 M, 0.01 M, and the concentration at equilibrium of glucose 6‑phosphate is 0.19 M. 0.19 M. Calculate the equilibrium constant, K eq , Keq, and the standard free energy change, Δ G ∘ , ΔG∘, of the reaction mixture.
Answer:
Keq = 19
ΔG° = -7.3kJ/mol
Explanation:
Based on the chemical reaction:
Glucose 1-phosphate ⇄ Glucose 6-phosphate
The equilibrium constant, Keq is defined as:
Keq = [Glucose 6-phosphate] / [Glucose 1-phosphate]
Where [] are equilibrium concentrations of each substance
Replacing:
Keq = [0.19M] / [0.01M]
Keq = 19
Now, standard free energy change, ΔG° is defined as:
ΔG° = -RT ln K
Where R is gas constant 8.314J/molK
T is absolute temperature (25°C + 273.15K = 298.15K)
and K is equilibrium constant = 19
Replacing:
ΔG° = -8.314J/molK*298.15K ln 19
ΔG° = -7299J/mol
ΔG° = -7.3kJ/mol
C3H8+5O2 --> 3CO2 + 4H2O
If you start with 434 g O2
1. How many grams of C3H8 are needed?
2. How many grams of CO2 form?
3. How many grams of H2O form ?
please show work
Answer:
3, 4 ,1
Explanation:
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explain how phytomining is used to extract copper from low grade ores. Full explanation
Explanation:
-plants that can absorb copper ions are grown on soil with low grade copper ores.
-the plants are burned and the copper compounds are within the Ash.
-copper ions can be leached from the Ash by adding sulphuric acid, this makes a solution of copper sulphate
-the displacement of scrap iron makes pure copper metals.
Plant Extraction (Plant Mining)
crops are grown in soil containing low-grade ore. Plants take up metal ions from the roots and concentrate these ions on the cells. The plants are harvested and burned. The remaining ash contains metal compounds.
How is phytomining used to extract copper?Plants absorb metal ions from their roots in a process called plant mining. It removes toxic metals from contaminated soil-eg around old mines. In the future, when high-grade ore is depleted, it may extract metals by burning plants to produce ash.
How to extract copper from low-grade copper?How to extract copper from low-grade copper ore? Copper is extracted from low-grade copper ore by hydrometallurgy. Cu is treated with cast iron or H2 and leached by acid.
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if you have 12g of compound A2B3 (159.7g/mol), how many moles do you have?
Answer:
0.075 moles n=m/M so divide the mass (m) by the molar mass (M) to get the n which is the number of moles
Explanation:
Give an example of an element which was named as honour to a scientist!!
Explanation:
1) Einsteinium
2) Albert Einstein
Answer:
Einsteinium, Rutherfordium, Nobelium, Curium etc are some examples of elements named after scientists
Dwarf planets are smaller than planets. What is another way that dwarf planets are different?
A. They are not spherical.
B. They do not orbit the sun.
C. They have large objects in their orbit.
D. They move more slowly along their orbits.
Answer:
number C
Explanation:
If the empirical formula of a compound is CH2O what is a possible molecular formula for
the compound?
A C2H4O2
B CH20
C C5H705
D CH40