according to the periodic table, which element is a noble gas?
Answer:
Argon, neon, krypton, Xenon, Radon and Organesson
I need help.
It measures 10 cm x 5 cm x 2 cm and has mass of 1,930g. What is the density of the gold bar?
2. Describe the difference between:
(a) a group and a period
Answer:
A group is a vertical row on the periodic table and a period is a horizontal row on the periodic table.
Explanation:
Answer:
A group on the periodic table refers to the vertical arrangement of the elements while a period refers to the horizontal rows of elements
how many oxygens are used per glucose molecule in glycolysis?
Answer:
0
Explanation:
Studying the brightness of a star can help scientist determine what part of the life-cycle a star is in. Is this true or false
Answer:
what do you mean?
Explanation:
Studying the brightness of a star can indeed help scientists determine what part of the life-cycle a star is in. The brightness of a star is directly related to its stage in the life cycle.The statement is true.
During the early stages of a star's life, it is formed from a cloud of gas and dust. As the star contracts under its own gravity, it starts to heat up and emits light. This is known as the protostar stage.
As the star continues to contract, it reaches a point where the core temperature becomes hot enough for nuclear fusion to occur. At this stage, the star enters the main sequence phase, where it will spend the majority of its life. The brightness of the star in this phase is determined by its mass. More massive stars are brighter than less massive ones.
As the star ages, it exhausts its hydrogen fuel in the core and begins to evolve. Depending on its mass, a star can become a red giant, a white dwarf, a neutron star, or even a black hole. Each of these stages has a different brightness profile.
By observing the brightness of a star over time, scientists can gather information about its age, mass, and evolutionary stage. This can provide insights into the star's life cycle and help in understanding the processes occurring within it.
Thus, studying the brightness of a star is an important tool for scientists to determine what part of the life cycle a star is in. By analyzing its brightness profile, scientists can gain valuable information about the star's age, mass, and evolutionary stage.The statement is true.
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Which subtance are acidic?
Please click above answer.
Finalmente responde:
- ¿Cuáles serían las características del agua filtrada que evidencie el funcionamiento del filtrador?
– Consideras que volver a filtrar la misma muestra de agua ¿disminuye la turbidez del agua?,, AYUDAAAAAAAAA
El agua se purifica a partir de un proceso de filtrado. Las características que evidencian el filtrado incluyen pH normal, color cristalino, ausencia de metales pesados y/o microorganismos, etc.
Los filtros para purificar agua son dispositivos que permiten el limpiado del agua con el objetivo de convertirla apta para consumo humano.En general, los filtros para lograr la purificación del agua consisten de carbón activado, el cual se prensa con alta presión. Este dispositivo de carbón activado permite secuestrar las partículas sólidas que pasan a través del filtro, con lo cual el agua sale a través del filtro completamente purificada.Las características que permiten determinar si el agua ha sido correctamente filtrada incluyen:
El agua sale cristalina, es decir, sin ningún tipo de color que evidencie la presencia de contaminación.El pH del agua potable debe oscilar entre valores normales (6,5 a 8,5)No debe contener metales tales como plomo, arsénico o cadmio (altamente tóxicos)No debe contener microorganismosAprende más sobre este tema en:
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Write Cadmium nitride formula using criss cross method
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here calcium is having an oxidation state of +2 called as Ca^{2+}Ca2+ cation and NO_3^{-}NO3− is a polyatomic anion with oxidation state of -1.. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral Ca(NO_3)_2Ca(NO3)2
Which physical change is represented by the diagram below? SC.8.P.9.2
Answer: Substances giving off heat and light, themselves, is always chemical. What we see in the sky are new colors and light. 1. Changing the size and shapes of pieces of wood would be a chemical change. 2. In a physical change, the makeup of matter is changed.
Explanation:
the energy level model of the atom was proposed by
Answer:
Niels Bohr
Explanation:
What is the main process that happens in the mantle?
Answer:
Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.
I think it is helpful for you!!!!
Please make me brainliest..
PLS HELP Make this a brief short summary.....
Answer:
Democritus was the first person to hypothesize the existence of atoms (the idea that you can't keep dividing matter forever). Scientists did eventually prove the existence of atoms. however, they aren't completley how he imagined them.
Could someone please help me
Answer:
Whistle 2 has a lower pitch, but is louder.
Whistle 3 has higher pitch and is less loud.
Explanation:
The more frequent the arches are the higher the pitch.
The larger the amplitude the louder the sound is.
;D
For This activity, you will create a diagram for each of the solutions you tested showing the dissolved solutes. Make sure to label the correct charges on the ions and circle the solutes that do not have charge. include a brief explanation under each diagram of its conductivity. Finally, write a brief explanation of what would happen to the conductivity of the ionic solutions if you were to mix in a covalant compound such as a sugar or one of the covalent solutions. Where have you seen a similar experiment and results?
Ionic solutions are known to be electrolytes due to the presence of free ions. Covalent solutions are non-electrolytes hence the decrease the conductivity of the ionic solutions.
Electrolytes are solutions that conduct electricity. The charge carriers in solution are ions. These ions are mobile. Covalent substances are molecular in nature. They do not contain ions hence they do not give ions when dissolved in water.
The conductivity of ionic solutions owes to the presence of ions in solution. The higher the concentration of ions in solution, the greater the conductivity of the solution. When covalent substances are mixed with ionic solutions, the concentration of ions decreases and the conductivity of the solution decreases.
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Can matter be created or
destroyed?
Yes or No
Answer:
No
Explanation:
The same amount of matter is present before and after chemical and physical changes. Matter cannot be created or destroyed
Answer:
none is created or destroyed. This concept is called the Law of Conservation of Mass.
atoms from different element combine to form
Answer:
new substances
Explanation:
Atoms of different elements can combine to make new substances. A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.
Cho 1,12 lít NH3 điều kiện tiêu chuẩn tác dụng với 16 g CuO nung nóng sau phản ứng còn một chất rắn x còn lại a tính khối lượng rắn x thu được b tính thể tích dung dịch HCl ph = 0,7 đủ để tác dụng với x
Answer:
11
Explanation:
because jrjrbd kiubsk luvs jd8uga
Anyone help me answer this please anyone
Answer:
[tex]\huge\boxed{\sf Q = 5880\ Joules}[/tex]
Explanation:
Given:
m = mass = 40 g = 0.04 kg
c = specific heat constant of water = 4200 J/Kg°C
ΔT = change in temperature = T2-T1 = 60 °C - 25 °C = 35°C
Required:
Q = change in heat energy = ?
Formula:
Q = mcΔT
Solution:
Q = (0.04)(4200)(35)
Q = 5880 Joules
[tex]\rule[225]{225}{2}[/tex]
what could cause a population of deer to decrease?
Explanation:
more predators, less deers. also starvation, and diseases.
Give reason:
Why Phosphorous is stored under water.
Answer:
Phosphorus ( white) us highly reactive and ignites at about 30°C when exposed to moist air
A space that is totally empty without any matter is called
What resources are sometimes shared by squirrels and certain birds answer quick I need to get to the bus stop!!
Answer:
I know someone that has the answer
Explanation:
I know someone that has the answer
For the following element, predict the most likely oxidation number (charge) for its corresponding ion.
Aluminum
A. Al+3
B. Al+1
C. Al-3
D. Al-1
The most likely ion of Aluminum is Al³⁺ (group 3A) since losing three electrons is the most energetically favorable way for it to follow the octet rule.
Because the charge on ions is equivalent to their oxidation state, then +3 is the most likely oxidation number of Aluminum.
during June , earth is 152,000,000km from the sun. how far is earth from the sun in miles
Answer:
94448421.2201
Explanation:
multiply the value in kilometers by the conversion factor '0.62137119223684'.
So, 152000 kilometers = 152000 × 0.62137119223684 = 94448.42122 miles.
Please answer with the correct answer <3
Substances can be categorized in two ways, as an (element, mixture or compound) or as a (solid,liquid or gas). Which of these methods are of most use to a chemist?
As a chemist, the classification of substances as elements, mixtures, or compounds is of more importance than the state of the substances.
Classification of substancesThe state of substances is mostly obvious to the eyes, even to those that are not chemists. In other words, the state of matter of substances is just a physical property that can be easily discerned.
Whether a substance is an element, mixture, or compound, however, is something that may not be discerned physically without carrying out some chemical analyses.
Thus, a chemist would be more interested in the classification of substances as elements, compounds, or mixtures.
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According to Democritus, which substance cannot be divided?
O A. molecules
O B. matter
O C. compounds
OD. atoms
Answer:
D.) Atoms.
I hope this helps! :)
Can someone make me a periodic table with color?
Answer:
The periodic table is also split into four blocks: s = red, p = green, d = yellow, and f = blue.
why can't you balance CaC2 + H2O > Ca(OH)2 + CH4?
Answer:
Balance The Chemical Equation Cac2 H2o Ca Oh 2 C2h2 Balance the chemical equation CaC 2 + H 2 O → Ca (OH) 2 + C 2 H 2 Calcium carbide react with water to produce calcium hydroxide and acetylene.
Explanation:
CaC2 + H2O > Ca(OH)2 + CH4
Ca + 2 H2O → Ca(OH)2 + H2 - Balanced equation
What is balance equation with example?A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia
What is the balance chemical formula?Balanced chemical equation - A chemical equation in which the number of each type of atom is equal on the two sides of the equation. Subscripts - Part of the chemical formulas of the reactants and products that indicate the number of atoms of the preceding element.
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a) What is the role of protons in an atom?
b) How do we determine how many protons are in an atom?
Answer:
The number of electrons, in turn, determines the chemical properties of the atom.
Protons contribute to the mass of an atom and provide the positive charge to the nucleus. The number of protons also determines the identity of the element.
Electrons have a negative charge. Since the atom is electrically neutral, the number of electrons must equal the number of protons.
The electrons arrange themselves in energy levels around the nucleus. The outermost or valence electrons of an atom are the ones that take part in chemical reactions. An element’s chemical properties depend on its valence electrons.
Explanation:
What is fire? Is it matter or is it energy?