help pls! this is for chemistry tmr is my last day in trying to get this in
Answer:
130.76g of Zn are needed
Explanation:
Zinc, Zn, reacts with silver nitrate, AgNO3, as follows:
Zn + 2AgNO3 → Zn(NO3)2 + 2Ag
Where 1 mole of Zn reacts with 2 moles of AgNO3
For a complete reaction of 4 moles of AgNO3 are needed:
4mol AgNO3 * (1mol Zn / 2mol AgNO3) = 2mol Zn
The mass of Zn is (Molar mass: 65.38g/mol):
2mol Zn * (65.38g / mol) =
130.76g of Zn are needed(reply w the answer or get reported) Please answer this
Explanation:
The distribution of electrons of an atom or molecule in an atomic orbital is called electronic configuration.
1. The electronic configuration of Fluorine: [He] 2s²2p⁵.
2. The electronic configuration of Neon: [He]2s²2p⁶
3. The electronic configuration of Sulfur: 1s²2s²2p⁶3s²3p⁴
4. The electronic configuration of Calcium:[Ar] 4s²
5. The electronic configuration of Iron: [Ar] 3d⁶4s²
Hence, this is the required solution.
dont know how to do this one someone pls help?
Answer:
the answer is C There is simply more collisions
Multicellular organisms are organized into tissues, organs, and organ systems.TRUE OR FALSE
Answer:
True i think..............
What is the mass of 2.15 liters of N2 gas at STP?
1.82 grams
2.68 grams
2.92 grams
3.11 grams
Answer:
2.68
Explanation:
Considering the definition of STP conditions, the mass of 2.15 liters of N₂ gas at STP is 2.68 grams.
Definition of STP conditionThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance. In other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of N₂ gasYou can apply the following rule of three: if by definition of STP conditions 22.4 L are occupied by 1 mole of N₂, 2.15 L are occupied by how many moles of N₂?
[tex]amount of moles of N_{2} =\frac{2.15 Lx1 mole}{22.4 L}[/tex]
amount of moles of N₂= 0.096 moles
In this case, the molar mass of N₂ is 28 g/mole.
Now, you can apply the following rule of three: If 1 mole of N₂ contains 28 grams, 0.096 moles of N₂ contains how much mass?
[tex]mass of N_{2} =\frac{0.096 molesx28 grams}{1 mole}[/tex]
mass of N₂= 2.68 grams
Finally, the mass of 2.15 liters of N₂ gas at STP is 2.68 grams.
Learn more about STP conditions:
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Which of the following accurately describes a Brønsted-Lowry acid?
A)
A Brønsted-Lowry acid receives a protein and has a matching conjugate acid.
B)
A Brønsted-Lowry acid donates a proton and has a matching conjugate base.
C)
A Brønsted-Lowry acid receives a proton and has a matching conjugate base.
D)
A Brønsted-Lowry acid donates a protein and has a matching conjugate acid.
Answer:
B. A Brønsted-Lowry acid donates a proton and has a matching conjugate base.
Explanation:
Here's HA is bronsted acid and its conjugate base pair is A-.
Answer:
Explanation:
The actual answer is B. The equation has an acid on one side and a base on the other. The acid donates a proton. Donates means gives up the equivalent of a proton.
What are changed after fushing the cover of the jar?
Answer:
the volume decreases and the pressure increases.
Answer:
When you first set the water balloon on top of the jar, the air pressure outside the jar and the air pressure inside the jar are the same. ... So now there is less air, less stuff, in the jar
Explain:
(a) Ethanol should be rectified after distillation.
Answer:
Ethanol (boiling point 78°C) and methanol (boiling point 65°C) are two miscible liquids. There is only a small difference in their boiling points. These two liquids are separated from their mixture by fractional ths distillation.
When vapours of the mixture pass through the fractionating column, repeated liquefaction and vapourisation take place. Subsequently, the vapours of low boiling methanol enter the condenser from the fractionating column, condense to liquid and get collected in the round bottomed flask first. Similarly, ethanol with higher boiling point can be collected later in another round bottomed flask.
WHAT IS OZONE.....................
How does it acts as safeguard?
Explanation:
The ozone layer is a natural layer of gas in the upper atmosphere that protects humans and other living things from harmful ultraviolet (UV) radiation from the sun. ... The ozone layer filters out most of the sun's harmful UV radiation and is therefore crucial to life on Earth.
saturated solution can be changed into unsaturated solution by treating. why??
Answer:
A saturated solution is that which is dissolved as much solute as it is capable of dissolving. By heating the solution a saturated solution can be changed into an unsaturated solution. Without adding any solvent it can be changed into an unsaturated solution. :]
When the sunlight stikes a leaf on a tree, what form of energy is it transformed to?
Answer:
ATP
Explanation:
Answer:
chemical energy
Explanation:
How many molecules of H2O are contained in 78.34 grams?
6.342 X 1019 molecules
2.618 X 1024 molecules
5.634 X 1025 molecules
9.984 X 1022 molecules
1.198 X 1026 molecules
Answer:
4.716x10^25
Explanation:
1 molecule of water is equivalent to 6.02x10^23
hence 78.34 is equivalent to 78.34x6.02x10^23
and the answer is 4.716x10^25
5. Which particle can not be accelerated by the electric
or magnetic fields in a particle accelerator?
A) neutron
B) proton
C) alpha particle
D) beta particle
Answer:
A. neutron
Explanation:
Neutrons cannot be accelerated in an electric or magnetic field because they are neutral in charge.
List at least three different properties that would help you determine whether the bars are made of the same metal.
Answer:
Refractive index
Heat capacity
Density
Explanation:
Properties that are used to identify materials are called intensive properties. These intensive properties are characteristic of the material and does not depend on the amount of material present.
Thus, if i want to identify whether the three bars are made of the same metal, i can look out for the following properties;
Refractive index
Heat capacity
Density
These properties are intensive properties thus they can be used to identify an unknown substance.
What is the percent yield for the reaction below when 544.5 g SO2 and 160.0 g O2 produce 382.0 g SO3? 2SO2(g) + O2(g) 2SO3(g) A. 56.1% B. 54.2% C. 23.9% D. 47.7%
Answer:
Option A.
Explanation:
Balanced equation is:
2SO₂ (g) + O₂(g) → 2SO₃(g)
First of all, we need to determine the limiting reagent. We convert mass to moles:
544.5 g . 1 mol / 64.06g = 8.5 moles of sulfur dioxide
160 g . 1mol / 32g = 5 moles of oxygen
Ratio is 1:2. 1 mol of oxygen needs 2 moles of sulfur dioxide
5 moles of oxygen may react to (5 . 2) /1 = 10 moles of SO₂
We only have 8.5 moles of SO₂ but we need 10 moles. In conclussion limiting reagent is SO₂.
Ratio is 2:2. 2 moles of SO₂ can prdouce 2 moles of SO₃
Then 8.5 moles of SO₂ must produce 3 moles of SO₃
We convert mass to moles, to determine the theoretical yield (100 % yield reaction) → 8.5 mol . 80.06 g /mol = 680.51 g
Formula for percent yield is: (Produced yield / Theoretical yield) . 100
(382 g / 680.51g) . 100 = 56.1 %
[HELP PLEASE !!} Which has a pH below 7?
a
acid
b
base
Answer: A- Acid.
Explanation: Because pH's greater than 7 are alkaline which is basic.
What property is not included in Dalton’s atomic model ?
what happens when two of the atoms get close together in javalab ionic bond simulation? (I've been messing with this thing for a hour and I still dont get what's happening)
Count the number atoms in the following compound
3 Al(OH)3
AL=
O
H=
1
2
Answer:
Explanation:
Let us look closely at the compound, Count the number atoms in the following compound Al(OH)3;
We shall considered the number of each atom present in this compound.
There is one atom of aluminum present
There are three atoms of oxygen present
There are three atoms of hydrogen present
Hence, there are a total of seven atoms of different elements in the compound.
Lion on a clifs edge pounces onto a deer below and consumes it what are the three energy transformations
Answer:
Energy from the question above: is converted first from gravitational potential energy, to mechanical energy, then finally to chemical energy.
Gravitational potential energy— mechanical energy— chemical energy
Explanation:
The Lion on the clifs edge, is above the earth's surface, has its energy stored in the form of gravitational potential energy. Gravitational energy = mgh (m = mass, g = gravitational field, h = height). The lion pouncing on the deer now has mechanical energy which comprises the addition of the lion's potential energy and its kinetic energy. After consuming the deer, the energy is in chemical energy which is important to build molecules of glucose.
someone help me with this please
periods occurred during the Mesozoic Era?
what is an equationwhat is a what is a catalyst
Which statement best describes the role of plate tectonics in changes that occur on Earth?
A: Convection currents in the mantle cause mountain ranges to slowly collapse over time.
B: The subduction of oceanic crust cools the mantle and prevents volcanic eruptions.
C: The movement of plates builds pressure that is released during an earthquake.
D: Seafloor spreading causes ocean basins to get smaller and shallower over time.
Answer:
the answer is A i learned this in class and i had the exact same question
help? why is chem SO HARD
Answer:
D. The potential energy of the products is greater than the potential energy of the reactants.
UwU
Differentiate between compounds and mixtures using the particle model of
matter.
Answer:
compounds are substance which can be formed by chemically combining two or more elements.
mixtures are substance that are formed by physically mixing two or more substances
what is the ideal gas constant?
A.it is a constant that applies only at STP
B.it is a specific constant for a specific gas
C.it is constant that depends on the conditions
D.it is a universal constant for all glasses
4) How many moles of O2 are produced with 42.0 moles of H2O?
Answer:
1.2353 mol
Explanation:
Which of the following statements explains how temperature affects the rate of a reaction ? (5 points ) When temperature decreases , collision of particles increases . When temperature decreases , kinetic energy increases . When temperature increases , particles move slower . When temperature increases , particles move faster
Answer:
As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return to the gas phase. Therefore, the solubility of a gas decreases as the temperature increases.
Explanation:
As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return to the gas phase. Therefore, the solubility of a gas decreases as the temperature increases.
The statement which explains the affects to temperature to the rate is that when temperature increases, particles move faster.
What is the rate of reaction?Rate of any reaction gives idea about the speed of the completion of any chemical reaction.
If temperature of the chemical reaction increases, then the movement of the particle increases.Fast movement increases the collision.And more collision in turn increases the rate of the reaction.Hence, when temperature increases, particles move faster.
To know more about rate of reaction, visit the below link:
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What is the source of all food energy on Earth?
A : decomposers
B : herbivores
C : producers
D : carnivores