Answer:
1) 4
2) 8
3) 20
4) 5
What is thermal energy?
A- the average overall volume of a system
B-the total number of molecules in a system
C-the kinetic energy of particles in a system
D-the measure of temperature in a system
Answer:
D-the measure of temperature in a system
ALL ABSURD ANSWERS WILL BE REPORTED AND REMOVED!
How much energy is needed to completely condense 205g of steam into liquid water?
Answer:
What is the amount of energy needed to change 20g of ice at 0°C to steam at 100°C?
A mattress you can fall back on.
Use the formula
q = m·ΔHf
where q = heat energy; m = mass; ΔHf = heat of fusion
q = (20 g)x(334 J/g)
q = 6680 J
Step 2: Heat required to raise the temperature of 0 °C water to 100 °C water
q = mcΔT
q = (20 g)x(4.18 J/g·°C)[(100 °C - 0 °C)]
q = (20 g)x(4.18 J/g·°C)x(100 °C)
q = 8360 J
Heat required to raise the temperature of 0 °C water to 100 °C water = 8360 J
Heat required to convert 100 °C water to 100 °C steam
q = m·ΔHv
where q = heat energy; m = mass; ΔHv = heat of vaporization
q = (20 g)x(2257 J/g)
q = 45140 J
Heat required to convert 100 °C water to 100 °C steam = 45140 J
Total energy required: 6680+8360+45140=60180 Joules
Or practically understanding it: about 20s in a 3000W kettle.
How many number of orbitals are in Potassium (K)?
1s^2 2s^2 2p^6 3s^2 3p^6 4s^1
Explanation:
Each orbital can only carry at most 2 electrons wih opposite spins.
The first 3 shells are fully filled, giving 9 orbitals.
There is an extra electron in 4s, which gives another orbital. (even though it is not filled yet)
Hence there are 10 orbitals.
1. Identify the flaw in the way Maria set up her experiment.
A. She did not take pictures.
B. She did not wait long enough.
C. She did not measure the temperature.
D. She did not mix the substances well enough.
2. Which of the following describes Maria making an observation?
A. Maria measured the compounds.
B. Maria let the test tube sit for one minute.
C. Maria wrote her results in her lab notebook.
D. Maria saw that bubbles formed on the metal in in mixture.
Answer:
c and d, because if maria did not measure the temperature then the experiment would not work and if you observe something that is some thing you see.
The energy released by an earthquake moves out from the earthquake's __________ in the form of seismic waves.
Answer:
The answer is Focus
The seismic waves are produced by an earthquake’s focus, which is the area in the Earth’s surface that experiences stress. These waves radiate energy that travels through the layers of the Earth.
A gas in a container has a pressure of 0.77 atm, volume of 65,5 L and a temperature of 235 K. If the gas
is helium, what mass of helium is in the container?
A) 2.61 g
B) 10.5 g
C) 0.625 g
D) 0.859 g
Answer:
B) 10.5
Explanation:
PV= NRT -> N=PV/RT
N= mols . P= pressure . V= volume in Liters T= temp in Kelvin (Celsius degree = 273.15) . R= Gas constant (.0821 for atm)
N=(.77 x 65.5)/(.0821x235) = 2.614 mols of Helium
Mols x Molecular weight = weight in grams
2.614x4.003(Molecular weight ot He) = 10.46 round to 10.5
ASAP will give brainliest!!!
Which of the following solid substances contains positive ions immersed in a sea of mobile electrons?
Your answer:
O2
Cu
CuO
NO2
Answer:
For me
Explanation:
It's Cu because other compound contains negative radicals
Explain why you hear a “whoosh” sound when you open a can containing a carbonated drink. Which gas law applies?
Answer:
The carbon dioxide in the headspace above the liquid is at higher pressure than atmospheric pressure outside the can. ... The change in pressure as the gas rapidly moves to become dispersed through its new volume causes the "whoosh" sound. The gas law that applies is Boyle's law.
Explanation:
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how to separate water from aqueous magnesium sulphate?
Answer:
The method generally involves heating a mixture of epsomite and halite to form clusters of lower hydrated magnesium sulfate crystals and subsequently applying slight pressure to the clusters so that they collapse to yield fine, less hydrated magnesium sulfate crystals which can then be easily separated from the ...
We have that This Separation is done by heating the Mixture to form magnesium sulfate crystals
Pressure is then applied to the magnesium sulfate crystals causing a collapse to give Reduced hydration of magnesium sulfate crystals
From the question we are told
How to separate water from aqueous magnesium sulphate?
Generally
Water
the is a composition of hydrogen and Oxygen at a required Proportion and it exists in gaseous state
aqueous magnesium sulfate
the is a composition of magnesium and Sulfur at a required Proportion and exists in aqueous
Therefore
This Separation is done by heating the Mixture to form magnesium sulfate crystals
Pressure is then applied to the magnesium sulfate crystals causing a collapse to give Reduced hydration of magnesium sulfate crystals.
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What are the half-reactions for a galvanic cell with Zn and Mg electrodes?
the half-reactions
cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)
anode : Mg (s) → Mg²⁺ (aq) + 2e−
a balanced cell reaction
Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)
Further explanationGiven
Zn and Mg electrodes
Required
The half-reactions for a galvanic cell
Solution
To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.
To determine this, we can either know from the standard potential value of the cell or use the voltaic series
1. voltaic series
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au
The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent
So the metal on the left will easily undergo oxidation and function as anode
Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode
2. Standard potentials cell of Mg and Zn metals :
Mg2+ + 2e– → Mg E° = -2,35 V
Zn2+ + 2e– → Zn E° = -0,78 V
The anode has a smaller E°, then Mg is the anode and Zn is the cathode.
Answer:
Explanation:help
What new evidence do you have to disprove the claim that some non-living things are made of cells? Explain your reasoning
Answer:
it is because non living things are not alive and it cannot be
Explanation:
because cells are the building thing of a living thing it is the most particular and simple reason but if you go deeper it consist of things called DNA which is a strips of protein that determines the info of a living things thats why if there is a reasoning that a nonliving things have cell its not.. thats all .
Gold has a density of 19.32 g/mL. If its mass is 56.94 grams what is its volume? (BE SURE TO SHOW ALL THREE PARTS:
EQUATION, WORK, AND PROPER FULL ANSWER.
Answer:
2.95 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{56.94}{19.32} \\ = 2947204...[/tex]
We have the final answer as
2.95 mLHope this helps you
What is the electron configuration for the Magnesium ion?
Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. The electronic configuration of metal ion Mg²⁺ is 1s² 2s² 2p⁶.
What is Ions?Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.
Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
The electronic configuration of Magnesium is 1s² 2s² 2p⁶3s². To make magnesium ion Mg²⁺, we need to take out two electron from Magnesium. The electronic configuration of metal ion Mg²⁺ is 1s² 2s² 2p⁶.
Therefore the electronic configuration of metal ion Mg²⁺ is 1s² 2s² 2p⁶.
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15) The element X has three naturally occurring isotopes. The isotopic massed (amu) and % abundances of the isotopes are given in the table below. the average atomic mass of the element is _____ amu.
i am kobe's pioletdsdcddsdcdds sd s d
Which process causes the greatest depletion of oxygen from the atmosphere?
Group of answer choices
weathering and oxidation
decay and bacteria
fossil fuel combustion
respiration of air breathing organisms
Fossil fuel combustion since one of the reactants is O2 and this reactions occurs in enormous quantities compared to aerobic respiration
Fossil fuel combustion causes the greatest depletion of oxygen from the atmosphere. Therefore, option C is correct.
When fossil fuels, such as coal, oil, and natural gas, are burned for energy production. The combustion process consumes oxygen from the atmosphere and produces carbon dioxide as a byproduct.
This combustion reaction is responsible for the largest contribution to the reduction of oxygen levels in the atmosphere, especially when considering the vast quantities of fossil fuels burned globally for various purposes like electricity generation, transportation, and industrial processes.
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energy transfer by electromagnetic waves
Answer:
Radiation is the transfer of heat energy through space by electromagnetic radiation.
Explanation:
Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is in the form of visible light. Light is made of waves of different frequencies.
All elements in a group will have the same number of protons true or false
Answer: False
Explanation: Elements have the same number of electrons in a group, especially valence electrons.
Hope this is correct
Fluorine belongs to group 17. How many covalent bonds are formed between two fluorine atoms?
Your answer:
1
2
3
4
Answer:
3??
Explanation:
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A beaker contains 20.0 ml of a 50.0 g/L solution. What will the new concentration be if you add 40.0 mL of water?
Answer:
moles SO42- = 0.0500 L x 0.20 M=0.010
moles Ba2+ = 0.0500 L x 0.10 M = 0.0050
Ba2+ + SO42- = BaSO4 (s)
moles SO42- in excess = 0.010 - 0.0050=0.0050
total volume = 100 mL = 0.100 L
[SO42-]= 0.0050/0.100= 0.050 M
[Na2SO4] = 2 /2 = 1 M
moles Na2SO4 = 2 M x 0.500 L = 0.500
mass Na2SO4 = 0.500 x 142 g/mol=71.0 g
moles MgBr2 = 46 /184 =0.25
moles Br- = 0.25 x 2 = 0.50
[Br-]= 0.50 / 0.50 L = 1 M
The boiling points, at standard pressure, of four compounds are given in the table below. Which type of attraction can be used to explain the unusually high boiling point of H2O?
Explanation:
Hydrogen bonding! Each hydrogen atom with a high charge density forms bonds with lone pairs on oxygen atoms. These bonds require a lot of energy to break giving water a relatively high boiling point.
Hydrogen bonding is the strongest forces of attraction between the molecule. Water has unusually high boiling point because of hydrogen bonding.
What is boiling point?Boiling point is the temperature at which a liquid's internal pressure equals the external pressure imposed by the liquid's vapour; in this situation, the addition of heat causes the liquid to turn into vapour without rising the temperature.
A liquid partially vaporizes into the space above it at any temperature up till the vapour the liquid's pressure at a certain temperature, which is a characteristic value. Water has unusually high boiling point because of hydrogen bonding. Hydrogen bonding is the strongest forces of attraction between the molecule.
Therefore, Water has unusually high boiling point because of hydrogen bonding.
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How many miles are equal to 1.7 km (1 inch = 2.54 cm)
Answer:
1.056 miles are equal to 1.7km
The narrow layer of Earth where life-supporting conditions exist is called the
Answer:
The narrow layer of Earth where life-supporting conditions exist is called the biosphere.
if you put a rock in a rock in a graduated cylinder and the water went from 100 ml to 120ml, then how much space or volume did the rock take ?
Answer:
30 miles
Explanation:
How does a substances temperature change when the average kinetic energy of its particles increases ? When the average kinetic energy decreases ?
Answer:
The temperature of a substance when the average kinetic energy of its particles increases and decreases when the average kinetic energy decreases.
Explanation:
Atoms and molecules are in constant motion. Kinetic energy is a form of energy, known as energy of motion. Kinetic energy is a form of energy, known as energy of motion. The kinetic energy of an object is that which is produced due to its movements, which depends on its mass (m) and speed (v).
Temperature refers to a quantity used to measure the kinetic energy of a system. That is, temperature is defined as an indicator of the average kinetic energy of the particles in a body.
So, since temperature is a measure of the speed with which they move, the higher the temperature the faster they move.
Finally, the temperature of a substance when the average kinetic energy of its particles increases and decreases when the average kinetic energy decreases.
Given the following equation: 2 KClO₃ ➞ 2 KCl + 3 O₂, how many grams of O₂ can be produced by letting 5.00 moles of KClO₃ react? *
4 points
12.0 g of O₂
480 g of O₂
24.00 g of O₂
240 g of O₂
Answer:
240 g of O2
Explanation:
......................
Which reaction energy diagram below would be spontaneous?
when 5 moles of ion oxide react with 25 moles of carbon monoxide what is the moles of the product formed when one of the reagents is used in excess
Answer: 25 moles of product are formed.
Explanation:
The balanced chemical equation will be :
[tex]Fe_2O_3+3CO\rightarrow 2Fe+3CO_2[/tex]
According to stoichiometry :
1 mole of [tex]Fe_2)_3[/tex] require = 3 moles of [tex]CO[/tex]
Thus 5 moles of [tex]Fe_2O_3[/tex] will require=[tex]\frac{3}{1}\times 5=15moles[/tex] of [tex]CO[/tex]
Thus [tex]Fe_2O_3[/tex] is the limiting reagent as it limits the formation of product and [tex]CO[/tex] is the excess reagent.
As 4 moles of reactant give = 5 moles of product
Thus 20 moles of reactants will give =[tex]\frac{5}{4}\times 20=25moles[/tex] of products
URGENT URGENT URGENT pls help me with this !!!!
Answer:
B
Explanation:
Electron affinity decreases down the groups and left to right across periods. since selenium is below oxygen in the group, it has a lower affinity
Answer: B
The answer is B. Hope this helped you
How many moles of copper would be needed
to make 1 mole of Cu,O?
Answer:
You can view more details on each measurement unit: molecular weight of Copper(I) Oxide or grams The molecular formula for Copper(I) Oxide is Cu2O. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Copper(I) Oxide, or 143.0914 grams.
Explanation:
What kind of energy would a textbook lose if you dropped it off a building
Answer:potential energy
Explanation:
