Answer:
in sixth period out of 32 elements, 14 elements have been placed separately in horizontal row below periodic table.
What are some chemical properties of nickel?
Answer:
It is a good conductor of heat and electricity
Its melting point is 1453°C and its boiling point is 2913°C
It's bivalent and it has a valency of two
An element has a half-life of 5.0 days. How many days would
pass before only 1/8th of the original amount of a sample of this
element remained?
How do you blow up a lithium watch battery?
Answer:
poke a hole in the battery ( it should me charged ) and then threw it in water
simple
Answer:
pock a hole and throw it in some water
Explanation:
when does mass change?
Answer:
the mass of an does not change with speed but changes when we add or cut a part of it.
Explanation:
Answer:
weight
Explanation:
reserve one spot for dmndburgess thx
Answer:
thanks for the points have a nice day :D
Explanation:
Which has more mass?
a
1 mole of Carbon
b
1 mole of Oxygen
c
1 mole of Chlorine
d
1 mole of Hydrogen
Answer:
Chlorine has more mass than the other elements.
Explanation:
We can find the mass of each element using the following equation:
[tex] m = \eta*A [/tex]
Where:
η: is the moles
A: is the standard atomic weight
a) For carbon, we have:
[tex] m_{C} = \eta*A = 1 mol*12.011 g/mol = 12.011 g [/tex]
b) For oxygen, we have:
[tex] m_{O} = 1 mol*15.999 g/mol = 15.999 g [/tex]
c) For chlorine, we have:
[tex] m_{Cl} = 1 mol*35.45 g/mol = 35.45 g [/tex]
d) And for For hydrogen, we have:
[tex] m_{H} = 1 mol*1.008 g/mol = 1.008 g [/tex]
Therefore, chlorine has more mass than the other elements.
I hope it helps you!
What i
Chemistry:
Collect information regarding periodical development of fundamental
particles and structure of atom with different atomic models and display
then information Chart.
Answer:
Periodical development of fundamental particles and structure of atoms can be explained from different atomic models .
Explanation:
Periodical development of fundamental particles :
About 2600 years ago an Indian sage called kanada proposed that all forms of matter are composed of very small particles called as Anu and each Anu is made up of smaller particles called Parmanu .
Later Greek philosopher Democritus called these atoms and according to him atoms are indivisible and indestructible .
John Dalton's theory describes elements in terms of atoms which he believed to be indivisible particles.But Later John Dalton's postulate which suggests that atom is indivisible is disproved by various experiments conducted by various scientists :
1. Electron - J.J Thomson discovered the electron while experimenting with cathode rays in 1897.
2. Proton - Proton was discovered by Gold stein in 1920.
3. Neutron was discoverer by James Chadwick in 1932 by bombardment of alpha particle at beryllium . Structure of atom :
J.J Thomson atomic model : After the discovery of electrons ; he proposed his plum and pudding model which shows that electrons are embedded throughout the positively charged material.Rutherford alpha particle scattering experiment : This experiment lead to the discovery of nucleus . According to this experiment all the positive charge and most of the mass of atom is concentrated in a small core called nucleus . According to this model nucleus is composed of neutrons and protons . Electrons are distributed around the nucleus and occupy most of the volume. Bohr atomic model : Bohr modified Rutherford atomic model of atom by suggesting that electrons move in specific energy levels around nucleus.Schrodinger's model of atom : This model is most precise model and is used in present days . According to him electrons are present in a particular region or space around the nucleus called as orbitals where probability of finding the electrons are more.
The people in a coastal location are packing emergency supplies and evacuating their homes. Which of these statements best explains this behavior of people in the location?
They want to track the origin of a hurricane.
They plan to prevent the occurrence of a hurricane.
They want to escape from the fury of a hurricane.
They plan to watch a hurricane from a high location.
Answer:
They want to escape from the fury of a hurricane.
Explanation:
Your welcomeeeeeeeeeeeee
Answer:
They want to escape from the fury of the hurricane
Explanation:
None of the other choices made sense. They are packing to leave.
Have a splendid day!
Define Isotopes with an example.
Answer:
One or more number of species which have same number of atomic number but different mass number are called isotopes.
For example, [tex]^{1}_{1}H, ^{2}_{1}H, ^{3}_{1}H[/tex] are the isotopes of hydrogen.
So here, the atomic number of each of these isotopes is 1 and have different mass number, that is, 1, 2, 3.
On the microscopic level, which answer best explains the concept of energy
transfer as heat when a hand is placed in water that is 50 °C. Body temperature is
37 °C. Choose the correct answer. *
Answer:
See explanation
Explanation:
The question is incomplete but i will try to help you the much i can.
You see, we already know about the fact that energy is transferred from a hotter object to a cooler object. This is largely because of the collision of the molecules of a hotter body with the molecules of a cooler body ultimately leading to a transfer of energy from the hotter body to the cooler body. This now makes the temperature of the cooler body to rise.
Keep in mind that temperature is a measure of the average kinetic energy of the molecules in a body.
Hence, since the water is at a higher temperature, energy is transferred from the water to the hand and the temperature of the hand rises accordingly.
5.6 x 10^3 cm = ___m
Answer:
56 m
Explanation:
5.6 x 10^3 = 5600
5600 / 100 = 56m
Iron (III) chloride reacts with potassium hydroxide to produce iron (III) hydroxide and
potassium chloride.
Answer:
The balanced chemical equation is :
FeCl3 + 3KOH → Fe(OH)3 + 3KCl
Question 2
Which of the following is a balanced chemical equation?
A
2 Al(OH)3 - Al2O3 + 3 H2O
B
2 Al2O3 + 3 H2O - 2 Al(OH)3
С
2 Al(OH)3 - Al2O3 + 3 H2O
D
Al(OH)3 + 3 H20 - AlO3
Answer:
C
Explanation:
For A, 2Al(OH)3 contains 6H on the left side of the equation but only has 3H on the right side of the equation, thus its not balanced
For B, there is 2(Al2), which is 4, on the left side of the equation but only 2Al on the right side of the equation, so it is not balanced.
For D, theres a total of 6 H on the left side of the equation as there is (OH)3 and 3H, but none of the right side, so its not balanced.
C is the correct answer as
on the left side of the equation:
2 Al(OH)3 has 2Al, 6O, and 6H
on the right side of the equation:
Al2O3 has 2Al and 3O
3 H20 has 3H and 6O
this makes a total of 2Al, 6H and 6O, which is equal to the number of each element in the left side, thus it is balanced and is the right answer.
In the future for these type of qns, you want to add up the number of each element on the left, then the ride, and see compare the numver of element they have. if the number of all the elements on both sides are the same, the equation is balanced.
What is the mid-ocean ridge? Two complete sentences.
Answer:
A mid-ocean ridge is an underwater mountain range, formed by plate tectonics.Mid-ocean ridges represent one of the most important geologic processes shaping the Earth
What does it mean for a solution to be supersaturated?
A. More solute has dissolved than should be possible.
B. More solute can still be dissolved in the solvent.
C. The dissolving speed was increased through heating.
D. The maximum amount of solute has been dissolved.
Explanation:
A supersaturated solution is a solution that contains more than the maximum amount of solute that is capable of being dissolved at a given temperature. The recrystallization of the excess dissolved solute in a supersaturated solution can be initiated by the addition of a tiny crystal of solute, called a seed crystal.
Supersaturated solutions have much more dissolved solute as saturated solutions, and then they can dissolve greater solute than that of the solution can at a specific temperature.
What is supersaturated solution?
Whenever the concentration of even a solute surpasses the concentration determined by the quantity equilibrium solubility, the chemical solution is said to be supersaturated.
.
A solution, which includes more than just the maximum quantity of solute that may be dissolved at a particular temperature is called a supersaturated solution. The injection of a microscopic crystal of solute, known as a seed crystal, can start the recrystallization of additional dissolving solute in a supersaturated solution.
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Are electrons shared with ionic or covalent bonds
Explain the particles in Solutions of sodium sulfate alone and lead nitrate alone explain what happens to these particles of the two solutions are added together steered then allowed to sit for a couple minutes
Answer:
white precipitates of PbSO4 will appear
Explanation:
Now let us first consider the reaction equation;
Na2SO4(aq) + Pb(NO3)2(aq) ---->2NaNO3(aq) + PbSO4(s)
So, if i mix solutions of sodium sulfate and lead II nitrate, stir it and allow it to stand for a couple of minutes, i will begin to see the appearance of white precipitates of PbSO4.
This follows from the solubility rules. Sulphates are soluble in water except those of group II ions, Pb^2+ and silver I ion.
When a fast moving particle runs into a slower moving particle
what happens ?
Answer:
It depends upon the mass of the particles also. Assuming equal mass, then the slower moving particle gains some energy, and the faster-moving particle loses energy. However, if the slower moving particle had greater mass, it could transfer energy to the faster-moving particle.
Explanation:
Hope I could help! :)
Dr. Laude doesn’t care for fancy definitions of a mole. He prefers the idea that a mole is:
A) an amount of a substance you can hold in your hand.
B) the amount of a substance you can store in a shoebox.
C) the amount of a substance you can place on the head of a pin.
D) the amount of a substance you can see with a microscope.
Answer:
A
Explanation:
Dr. Laude prefers the idea that a mole is an amount of a substance you can hold in your hand.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons .Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
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sulpher is a non metal
Answer:
Sulphur is a non-metal because it's valency is 6 and it have many character of non-metal.
What is a scientific theory?
A theory is a summary of a scientific fact based on observation.
A theory is an explanation of why a scientific process occurs.
A theory is a proven scientific law.
A theory is a guess as to what will happen.
Answer:
Explanation:
I'm guessing B)
I'm 86.7% sure that might be right.
Answer:
A theory is a broad, natural explanation for a wide range of phenomena.
urgent plzz help meeee thx
3,1,2 should be the correct answer
*
Which of the following would NOT be found in an animal cell?
Chloroplasts
Endoplasmic Reticulum
Cell Membrane
Nucleus
Answer:
chloroplasts
Explanation:
chloroplasts are what make plants green, they are not included in animal cells
what is base? what Is the sugar also a base?
Answer:
base is also known as alkaline
n sugar is not a base
Which of the following are evidence that a chemical reaction has occurred?
A. Two liquids are combined and a gas is released
B. A substance is added to water and dissolves
C. Two liquids are combined and a solid precipitate forms
D. A new substance is formed
E. A single reactant changes from a liquid to a solid
Answer:
A, B and C
Explanation:
The 7 rules of chemical change....
Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas. ...
Formation of a Precipitate. ...
Color Change. ...
Temperature Change. ...
Production of Light. ...
Volume Change. ...
Change in Smell or Taste.
Liquids and solids are referred to as "condensed phases" because the attractive forces cause molecules to become stationary. leave little space between the molecules. create large spaces between the molecules. that hold the molecules together are negligible.
Answer:
leave little space between the molecules.
Explanation:
Matter is made up of small particles called molecules. These molecules present in matter are arranged inside its bulk.
In liquids and solids, the molecules are arranged very close together in such a way that there is only a little space between them. This is why liquids and solids are referred to as "condensed phases".
They are quite unlike gases where there is a lot of space between gas molecules.
Answer:
B
Explanation:
Which of the following words/phrases can be used to describe table salt (NaCl)?
Select one or more:
a.Compound
b.Element
c.Mixture
d.Pure substance
Which condition most likely causes a V-shaped valley to form? A Fast-moving river B Deposition of rock C Erosion by wind D Slow-moving glacier
Answer:
C
Explanation:
how do stars generate energy??
Answer:
The energy source for all stars is nuclear fusion. Stars are made mostly of hydrogen and helium, which are packed so densely in a star that in the star's center the pressure is great enough to initiate nuclear fusion reactions. In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom.
There are two main isotopes of chlorine. 75% of chlorine atoms have a mass number of 35, while 25% have a mass number of 37. Use this information to work out the relative atomic mass of chlorine.
Answer:
Relative atomic mass = 35.5
Explanation:
Given data:
Abundance of Cl -35 = 75%
Abundance of Cl -25 = 25%
Average atomic mass = ?
Solution:
Relative atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Relative atomic mass = (75×35)+(25×37) /100
Relative atomic mass = 2625 + 925 / 100
Relative atomic mass = 3550 / 100
Relative atomic mass = 35.5