Based on the models, why do you think helium is number 2( the second element) and beryllium number 4( the fourth element) on the periodic table?
Points!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Is that you?
Explanation:
in which ratio will group (1) elements react with group (vi) elements
Answer:
Group1 elements will react with groupvi element in the ratio
1:2
Group ( 1 ) elements react with group ( vi ) elements in 1 : 2 ratios. Group ( 1 ) elements are alkali metals and group ( vi ) elements are chalcogens.
What is element ?A chemical element is a species of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei.
Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules. All living and non-living things are made up of elements, which are fundamental building blocks.
They serve as the universe's center. Elements make up every particle, no matter how little or large. The five primary elements that make up our body are carbon, hydrogen, oxygen, nitrogen, and calcium.
Thus, Group ( 1 ) elements react with group ( vi ) elements in 1 : 2 ratios.
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How does a refrigerator cool food and drinks
Answer:
Refrigerators work by causing the refrigerant circulating inside them to change from a liquid into a gas Explanation: Its :
called evaporation, cools the surrounding area and produces the desired effect.
Find the relative molecular mass of hydrated iron (II) sulphate FeSO4.7H2O
Answer:
the relative molecular mass of hydrated iron (II) sulfate FeSO4.7H2O is 278.02
Explanation:
What is kaleidoscope? Write it's use .
Answer:
Kaleidoscope is an optical toy consisting of two mirrors at a particular angle. Some common uses of the kaleidoscope are: Kaleidoscope produces beautiful patterns that are used by fashion designers. A kaleidoscope is used as a toy for entertainment.
Hope it's helpfulcalculate the translational partition function of xenon and helium at the them temperature and volume
Explanation:
a) The ratio of the translational partition of D2 and H2 is 2.82
b) The ratio of the translational partition of xenon and helium is 187.56
Explanation:
a) The translational partition for D₂ is equal to:
Where
m = mass of molecule
k = Boltzmann constant
T = absolute temperature
V = volume of container
h = Planck constant
If rewrite the equation:
The same for the H₂ molecule:
Taking the ratio D₂ and H₂:
Where
mH₂ = 2.015894 amu
mD₂ = 4.028204 amu
b) The same way to part a)
5 mL of Metal A has a mass of 2.45g. What is the density?
Answer:
Density = Mass/Volume
= 2.45/5
Density= 0.49 g/ml
Please help due today
Which mixture is heterogeneous?
A. coffee with milk
B. lemonade with ice
C. paint
D. liquid detergent
Answer: lemonade with ice ?
Explanation:
The density of aluminum is 2.70 g/mL. What is the mass of a 15.9 cm X 11.6 cm X 7.3 cm block of aluminum?
Hi, the answer is 3510g
Step-by-step explanation:-
We know that density of a substance tells us the mass of exactly one unit of volume of given substance. In this question,
Aluminium density = 2.70g/mL
So,
V = L x W x H = 1300 cm³ = 1300 mL
m = D x V = (2.70 / 1300) = 3510g
In this question you should assume that all gases behave ideally.
Hydrogen and iodine react reversibly in the following reaction. The system reaches dynamic
equilibrium.
H2(g) + I2(g) 2HI(g) ∆H=–9.5kJmol–1 Which statement must be true for the Kp of this equilibrium to be constant?
A The partial pressures of H2, I2 and HI are equal.
B The external pressure is constant.
C The forward and reverse reactions have stopped.
D The temperature is constant.
Answer:
B
Explanation:
The number of moles of each reactant is equal, there by pressure has no effect on the chemical system. Pressure is constant
If you were to have a bottle containing compound X in your closet, what phase would it most likely be in? *
Answer:
Most likely gas
Explanation:
Which has higher specific heat capacity, iron or brick (Concrete
Answer:
Brick
Explanation:
Answer:
Explanation:
Brick has a heat capacity of 840 J/kg degree Centigrade.
That means that if you have 1 kg of brick, you will need to add 840 joules of heat to get it to go up 1 degree C.
The heat capacity of iron is 450 J/kg (degree centigrade).
Brick has the higher heat capacity. Undefined in all of this is a joule. It is a work unit. The problem is that to define a joule accurately, you need to bring in a lot of other units. Content yourself by understanding that both the iron and the brick are measured in the same units -- Joules.
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Answer:
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Suppose a 250.mL flask is filled with 1.1mol of Br2 , 1.8mol of OCl2 and 0.50mol of BrOCl . The following reaction becomes possible: +Br2gOCl2g +BrOClgBrClg The equilibrium constant K for this reaction is 3.38 at the temperature of the flask. Calculate the equilibrium molarity of OCl2 . Round your answer to two decimal places.
I lil one nice to meet you and how is your day
A 18.5-mL sample of a glucose IV solution has a mass of 19.1 g. What is the density of the glucose solution ?
Answer: 1.0324(g/ml)
We have the formula [tex]m = Vd[/tex]
Where m is the mass, V is the volume, and d is the density
Divide both sides by V, we get [tex]d=\frac{m}{V}=\frac{19.1}{18.5} = 1.0324 (g/ml)[/tex]
what is chlorine anyone tell
Answer:
A toxic, green, gaseous chemical element (symbol Cl) with an atomic number of 17.
why are you taking chemistry class?
Answer:
Because it helps me connects other sciences to each other, such as biology, physics, geology, and environmental science. Basic knowledge of chemistry helps you to read and understand product labels. Chemistry can help you make informed decisions.
(Happpy to help!)
Answer:
Because chemistry class is very important.
Convert 4752 meters into miles
Answer:
2.935 miles
Explanation:
because when you convert feet into miles, it all adds up
Which of the following describes an atom?
A. smallish units of two hydrogen joined together
B. 6 protons six neutrons in the nucleus and six electrons in the electron cloud
C. hydrogen chemically combined with an oxygen
D. 6 protons 6 neutrons in the nucleus and seven electrons in the electron cloud
Answer:
Correct answer is option (3) .
Explanation:
Hope it helpful....
State the difference that may be observed between the solids obtain by evaporating a solution of a solid to dryness or letting it the solution stand until the solid crystallizes.
Answer:
It well melt.While theother one will dry
Explanation:
Why would a line graph be better to show the relationship between predator and prey birds in an ecosystem than a circle graph?
A. A circle graph would be better to show this relationship.
B.The number of the two classes stays the same over time.
C.The number of the two classes changes over time.
D.None of the above.
Answer:
C
Explanation:
Line graphs are better to show the relations between over time, as circle shows the amount or present of something in a cert time
Which of the following represents the electronic structure of three elements in the periodic table
A. 2.8.1 2.8.3 2.8.4 B. 2.8 2.8.1 2.8.2
C. 2.7 2.8 2.8.1 D. 2.1 2.8.1 2.8.8.1
Answer:
a
Explanation:
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what are the properties of alkali earth metals
Properties of the Akali Earth Metals.
They have low melting points.They have low boiling points.They are shiny in nature.They are generally Silvery-white in colour.They have low densities.They are highly metallic.They are good conductors of electricity.They are strong reducing agents.They are highly reactive.[tex] \\ [/tex]
How many inches are in 4.5 miles?
How does the state of matter affect the behavior of molecules?
Answer:
The behavior of molecules in different phases of matter represents a balance between the kinetic energies of the molecules and the attractive forces between them. All molecules are attracted to each other. The molecules are in the solid-state. At higher temperatures, the kinetic energy of the molecules is higher.
Molecules are the various elements linked together and are present in the matter. The molecules in different phases of matter are represented by kinetic energies and attractive forces.
What is the kinetic molecular theory of matter?The kinetic molecular theory of matter elucidates the composition of the matter of particles of tiny size. The theory explains matter like gas, liquids, and solids.
The different states of matter explain the constant movement and negligible intermolecular force and volume of the particles. The particle matter is said to undergo elastic collision.
The molecules of solids have low kinetic energy whereas the molecules of liquids and gases show high kinetic energy as the particles are placed at larger distances.
Therefore, the state of matter affects the behavior of molecules.
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A complete reaction indicated by the chemical equation below produces 79.0 g of sulfur. Estimate the number of hydrogen atoms found in the amount of water that forms as a second product in this reaction.
2 H2S(g) + SO2(g) → 3 S(s) + 2 H2O(l)
a. 1.98 × 10^24 atoms
b. 4.80 × 10^23 atoms
c. 6.40 × 10^25 atoms
d. 1.02 × 10^26 atoms
e. 3.00 × 10^24 atoms
Answer: A, 1.98x10^24 atoms of H
Explanation: 39.0 g of sulfur = (79.0g/32.1 g/mole) = 2.46 moles S
The balanced equation promises we'll get 2 moles H2O for every 3 moles ofS, a molar ratio of (2 moles H2O)/(3 moles S)
(2.46 moles S)*[(2 moles H2O)/(3 moles S)] = 1.64 moles H2O
(1.64 moles H2O)*(6.02x10^23 molecules H2)/mole H2O)*(2 H atoms/H2O molecule) = 1.97x10^24 atoms of H
you have 100ml of 0.5M HCL solution and you want to dilute it to exactly 0.1M how much water should you add?
Answer:500 ml
Explanation:
M1 = 0.5
V1 = 100 ml
M2 = 0.1
V2 =??
M1 * V1 =M2 * V2
0.5 M * 100 ml = 0.1 M *V2
V2 =0.5 M * 100 ml /0.1 M
V2 = 500 ml
Draw out a Simple electro Chemical Symbols in ions
Answer:
In redox reactions, electrons are transferred from one species to another. If the reaction is spontaneous, energy is released, which can then be used to do useful work. To harness this energy, the reaction must be split into two separate half reactions: the oxidation and reduction reactions. The reactions are put into two different containers and a wire is used to drive the electrons from one side to the other. In doing so, a Voltaic/ Galvanic Cell is created.
Explanation:
When a redox reaction takes place, electrons are transferred from one species to the other. If the reaction is spontaneous, energy is released, which can be used to do work. Consider the reaction of a solid copper (Cu(s)) in a silver nitrate solution (AgNO3(s)).
he AgNO3(s) dissociates in water to produce Ag+(aq) ions and NO−3(aq) ions. The NO3-(aq) ions can be ignored since they are spectator ions and do not participate in the reaction. In this reaction, a copper electrode is placed into a solution containing silver ions. The Ag+(aq) will readily oxidize Cu(s) resulting in Cu2+(aq), while reducing itself to Ag(s).
This reaction releases energy. When the copper electrode solid is placed directly into a silver nitrate solution, however, the energy is lost as heat and cannot be used to do work. In order to harness this energy and use it do useful work, we must split the reaction into two separate half reactions; The oxidation and reduction reactions. A wire connects the two reactions and allows electrons to flow from one side to the other. In doing so, we have created a Voltaic/ Galvanic Cell.