Answer:
Calcium
Explanation:
is a silver-gray metal which takes its name from the Latin word calx, which means lime. It is the fifth most abundant element in the earth's crust and is widely distributed as limestone (CaCO3), quicklime (CaO) and calcium fluoride.
Alkaline earth metals are present on the left of the periodic table. Therefore, calcium is the alkaline earth metal is the components of quick lime.
What is metal ?Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.
The properties of metals are:
1.Since metals have free electrons that's why they can conduct electricity
2. Since atoms in metals are very closely packed in a definite crystal so these are solid. It is not brittle that is it can not be broken down easily
3. It does not react with water easily.
4.It is denser than water hence it sink in water.
The formula for quick lime is quicklime (CaO). The alkaline earth metal that is component of quick lime is calcium Ca. Quick lime is used in white washing.
Therefore, calcium is the alkaline earth metal is the components of quick lime.
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A balloon contains Helium, Neon, Argon, and Krypton gases. The pressure of the balloon is 1000 kPa. The following pressures are known: PHe = 350 kPa, PNe = 220 kPa, and PAr = 70 kPa. Determine the pressure of krypton in the balloon.
Answer:
360kpa
Explanation:
all those gases are noble gases.they do not react with each other.therefore the the total pressure of the balloon equals to the addition of all individual pressures of the gases.
total pressure=[ pHe+pNe+pAr+pKr]
1000kpa=[350kpa+220kpa+70kpa+pKr]
pKr=360kpa
Please help me to calculate the volume of the rectangle above
Answer:
200m
Explanation:
V=L x W x H
V=5m x 4m x 10m= 200m
Answer:
volume is 200m³
Explanation:
The volume of a rectangle is length x width x height.
h=10m, w=4m, 5m
multiply together to get 200
volume is cubed so the unit is m³
What is the Protist kingdom made up of?
1. Plants
2. Simple organisms
3. Complex organisms
4. Animals
Answer:
2 is the answer
Explanation:
What is the problems in the HYDROELECTRIC?? Please tell me I will mark you !!!!
Answer:
Using hydroelectricity or Hydropower can cause enviromental threats, such as damaging wild life, habitat, water quality, and obstruct fish behaviors. Also it diminish recreational benefits of rivers.
Explanation:
An atom of sodium -23 na -23 had a net charge of +1 identify the number of protons, neutrons, and electrons in the atom then explain how you determined the number of each type of particle
Answer:
Protons = 11
Electrons = 10
Neutrons = 12
Explanation:
The atomic number of an element is the number of protons present in the nucleus of an atom of that element. A neutral atom of an element contains equal number of protons and electrons, therefore, the atomic number is also the electron number for a neutral atom.
The mass number is the sum of proton and neutrons in the nucleus of an atom of an element.
The atomic number of sodium-23, Na-23 is 11 while the mass number is 23.
An atom of sodium that has a net charge of +1 has lost an electron. Therefore, from the above information, the number of protons, neutrons and electrons present in this atom of sodium-23 is as follows:
Protons = 11
Electrons = 11 - 1
Electrons = 10
Neutrons = 23 - 11
Neutrons = 12
Select the correct answer.
What is the chemical formula of trisilicon tetranitride?
A.
Si3N4
B.
Si4N3
C.
Si3N6
D.
Si6N3
E.
Si4N6
Which statement about energy is correct?
A) A little energy is lost every time an energy transformation occurs.
B) Because of the conservation of energy, it is possible to have a machine that would never need energy.
C) Conservation of energy occurs only when some of the energy is converted to light.
D) Energy can change form, but energy can never change in total amount.
Answer:
B) is true
Explanation:
because in the 24th century that we are now people have created machine that can work without energy
The transfer of energy between systems through work is the expansion of gas in a steam engine. By doing work or by transferring heat, energy can be transferred. Therefore, option B is correct option.
What is energy transfer?
Energy transfer is a phenomenon in which energy transfer from one matter to another matter. energy requirement is necessary to move nay object so work has to be done by the gas to the piston.
Heat can be transferred by three ways radiation, convention or conduction. In conduction, direct contact of two body is necessary for transfer of molecules. Due to the conservation of energy, it is possible to synthesize a machine that would never need energy.
Therefore, the option B is correct option that is because of the conservation of energy, it is possible to have a machine that would never need energy.
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In an experiment, marble chips reacted with dilute hydrochloric acid and carbon dioxide gas was given
off. The experiment was done twice, once using small marble chips and again with large marble chips.
Look at the graph. Was the total mass of marble chips the same each time?
Answer:
no
Explanation:
Small marble chips reacts faster
the distribution of electrons in atomic orbital is called
Answer:
electronic configuration
Q3. Which of the following elements is a noble gas?
A Argon
B Chlorine
C Potassium
D Bromine
Answer:
The answer is argon. Pls mark as brainliest
NaCl + NH3 + CO2 + H20 NaHCO3 + NH4CI
Which Lewis electron-dot diagram correctly represents the reactant containing nitrogen in the equation?
Option (1) represents the Lewis electron-dot diagram correctly containing nitrogen in the equation.
Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the two atoms.
Valence electrons are given by hydrogen atoms = [tex]1\times3=3[/tex]
Valence electrons are given by nitrogen atom = [tex]5\times1=5[/tex]
Total valence electrons = 3 + 5 = 8
So, the calculation above is shown only the first option. So, (1) Lewis electron-dot diagram correctly represents the reactant containing nitrogen in the equation.
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Minerals in geodes form spectacular euhedral crystals because ________. A. all of the elements incorporated in the crystals are in plentiful supply B. the crystals have abundant room to grow in their hollow surroundings C. minerals within geodes are always framework silicates D. minerals within geodes always contain iron
Answer:
C. minerals within geodes are always framework silicates
Explanation:
This is true going by the facts that, it is only the silicates that can be able to form crystals as obtainable in diamonds etc. Since the minerals in geodes are in the framework of silicates families, they can be able to form euhedral crystals.
what does indicator that a chemical change has occurred?
Answer:
change in color or state of matter
Explanation:
hope i helped! ❤❤
Microwave radiation is absorbed by the water in food. As the water absorbs the heat it causes the food to get hot. If the wavelength of a microwave is 10, calculate the frequency and the energy of each photon.
Answer:
1) The frequency of each photon is 3.0 × 10⁹ Hz
2) The energy of each photon is 1.98786 × 10⁻²⁴ J
Explanation:
The energy, 'E', in a photon of light is given by Planck's equation as follows;
E = h·f = h·c/λ
Where;
E = The energy of a photon
h = Planck constant = 6.6262 × 10⁻³⁴ J·s
f = The frequency of the photon/radiation
c = The speed of light = 3.0 × 10⁸ m/s
λ = The wavelength of the photon/radiation
The given parameters of the microwave are;
The wavelength, λ = 10 cm = 0.1 m
The type of wave = Microwave
1) From E = h·f = h·c/λ, we find that the frequency, 'f' equals c/λ
∴ f = 3.0 × 10⁸ m/s/(0.1 m) = 3.0 × 10⁹ 1/s = 3.0 × 10⁹ Hz
The frequency of each photon, f = 3.0 × 10⁹ Hz
2) From E = h·f = h·c/λ, the energy, 'E', of each photon is given as follows;
E = h·c/λ = 6.6262 × 10⁻³⁴ J·s × 3.0 × 10⁸ m/s/(0.1 m) = 1.98786 × 10⁻²⁴ J
The energy of each photon, E = 1.98786 × 10⁻²⁴ J
Balance the equation Ag2O ->Ag + O2
Answer:
For balancing this equation
we need to put
Ag2O. = 2
Ag = 4
O2 = 1
Hope it will help
The balanced chemical equation of decomposition of silver oxide is 2 Ag₂O -> 4 Ag + O₂.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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When KOH dissolved in ethanol, what is the intermolecular attraction between OH- ions and C2H5OH molecules
When the zinc atom breaks its bonds with chlorine to make bonds with copper, is it a chemical or physical change?
Answer: it is a chemical change
Explanation:
The two basic types of air pollutants are _____.
liquids
invisible
particulates
gases
Answer:
particulates and gases
Explanation:
A worker paints a 5.2 foot wide crosswalk on a street her boss tells her to make crosswalk 1.25 foot
The question is incomplete. The complete question is :
A worker paints a 5.2 foot wide crosswalk on a street her boss tells her to make crosswalk 1.25 feet wider. How wide is the finished crossroad ?
Solution :
It is given that the worker paints a crossroad on a street whose width is = 5.2 feet.
The boss of the worker asks the worker to make the width of the cross road 1.25 feet more wider.
Thus the required width of the cross road is = 5.2 feet + 1.25 feet
= 6.45 feet.
Therefore the finished cross road is = 6.45 feet wide.
Can you help me please....
sorry the pic is blocked
Which type of reaction occurs in the sun to release light and heat?
cohesion
chemical
fission
nuclear
Answer:
The answer is nuclear
Explanation:
The Sun is a main-sequence star, and, as such, generates its energy by nuclear fusion of hydrogen nuclei into helium.
Balance this equation: Ca(OH)2 +
HCI →
CaCl2
+
H20
Answer:
Double Displacement (Acid-Base)
Explanation:
7. A small stone added to boiling liquids to make them boil more evenly without sudden violent releases of
vapours are called
Answer:
A boiling chip, boiling stone, porous bit or anti-bumping granule is a tiny, unevenly shaped piece of substance added to liquids to make them boil more calmly.
These help in making the liquid boil more easily
Answer:
umm i think it's called boiling chip
What is the difference between a divide and a drainage basin?
Answer:
Drainage basin, also called catchment area, or (in North America) watershed, area from which all precipitation flows to a single stream or set of streams. ... The boundary between drainage basins is a drainage divide: all the precipitation on opposite sides of a drainage divide will flow into different drainage basins.
Explanation:
just looked it up
Why is there a difference in the heating rates of land and water?
Just need the two blanks filled :)
Answer:
Dont answer this question its an online exam question
Explanation:
1 point
7) While preparing a temporary mount of cheek cells, teacher asked Rohit
to pick up the stain. He had four bottles A, B, C and D containing Methylene
blue, glycerin, distilled water, Canada balsam respectively. Which one
should he pick? *
А
B
C
D
Initially, the chalk had a mass of 323.5 grams but upon completion, its mass had dropped to 301.2 grams. What is the change in mass?
What factors determine the amount of energy stored in a gummy bear, and how do they affect the amount of energy stored?
Some ideas to get you started: Type of bond, number of bonds, etc
Answer:i don’t know
Explanation:i don’t know
is a mirror transparent, translucent, or opaque?