Answer:
Noble gases have a complete valence electron shell making them stable and nonreactive.
Explanation:
who is credited with developing the periodic table
Answer:
Dimitri mendleev and Albert something. I forgot his last name. I think ghorso. Albert ghorso.
True or false? The empirical formula of a compound is the simplest formula that shows the numerical relationship of the elements in the compound.
Answer:
True
Explanation:
the empirical formula usually shows us the atoms' symbols and then how much of them are present in this certain compound. For example there is H2O
what is actually chemistry
Answer:
Chemistry is the branch of science that deals with the properties, composition, and structure of elements and compounds, how they can change, and the energy that is released or absorbed when they change.
Answer:
Well my teacher said a more complex way he said chemistry is the science that deals with the properties, composition, and structure of substances.
Explanation:
An electron is present at an energy level with an energy of 16.32 x 10−19 J. During a transition to another level, 5.4 x 10−19 J of energy was absorbed. Which of the following is true about the present state of the electron?
Answer Choices:
A. The electron moved down to an energy level and has an energy of 10.92 x 10−19 J.
B. The electron moved down to an energy level and has an energy of 21.72 x 10−19 J.
C. The electron moved up to an energy level and has an energy of 10.92 x 10−19 J.
D. The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Answer:
D. The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
The statement which is true about electrons is that the electron moved up to an energy level and has an energy of 10.92 x 10[tex]^-[/tex]¹⁹ J which is found out as 16.32 x 10[tex]^-[/tex]¹⁹ -5.4 x 10[tex]^-[/tex]¹⁹=10.92 x 10[tex]^-[/tex]¹⁹ J.
What is an energy level?Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.
Energy of the stationary state is given as E= -R
1/n² where R
is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.
They can also be defined as the distances between electron and nucleus of an atom . Electrons present in K energy level have least energy .Energy level diagrams are studied to understand nature of bonding , placement of electrons in orbits and and elemental behavior under certain conditions.
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PLEASE DON'T PUT ANSWER AGAINST GUIDELINES!!!
Answer:
160.3 g S
Explanation: there you go
Give one example of how environmental factor could influence the way a gene is expressed.
Answer:
The presence of drugs or chemicals in an organisms environment can also influence gene expression in the orgains.
CH4+4S-CS2+2H2S
how many moles of CS2 can be formed by the complete reaction of 10.6 mol of S
Let's check the equation
[tex]\\ \sf\longmapsto {CH_4\atop 1mol}+{4S\atop 4moles}\longrightarrow {CS_2\atop 1mol}+{2H_2S\atop 2moles}[/tex]
4moles of S gives 1 mol of CS21mol of S gives 1/4=0.25mol of CS210.6mol of S gives:-[tex]\\ \sf\longmapsto 10.6(0.25)=2.65moles\:of\:CS_2[/tex]
Fill in the blanks:
87 pg = [? ]x10^[?]g
87 picograms are equivalent to [tex]8.7\times 10^{-11}[/tex] grams.
This is a unit problem, in which a derived unit must translated into a fundamental unit. A picogram is a equivalent to a trillionth of a gram, which is the fundamental SI mass unit. Mathematically speaking, we have the following equivalence:
[tex]1\,pg = 1\times 10^{-12}\,g[/tex]
Now we proceed to find the equivalent value for this case:
[tex]87\,pg[/tex]
[tex]87\times 10^{-12}\,g[/tex]
[tex]8.7\times 10^{-11}\,g[/tex]
87 picograms are equivalent to [tex]8.7\times 10^{-11}[/tex] grams.
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isotopes of an element contain different numbers of
A 24.81-g sample of a gaseous compound containing only carbon, oxygen, and chlorine is determined to contain 3.01 g C, 4.00 g O, and 17.81
g Cl. What is this compound's percent composition?
Explanation:
getting the empirical formula
For carbon
3.01/12 = 0.2508
For oxygen
4/16 = 0.25
For Cl
17.81/35.5= 0.501
0.2508 ÷ 0.25 = 1.0032
0.25 ÷ 0.25 = 1
0.501 ÷ 0.25 = 2.004
Empirical formula of the compound = CCl20
Molar mass = (1×12) + (2×35.5) + (1×16)
= 12 + 71 + 16
= 99g/mol
percentage composition= 24.81/99 × 100
= 25.06%
A 24.81-g sample of a gaseous compound containing only carbon, oxygen, and chlorine is determined to contain 3.01 g C, 4.00 g O, and 17.81 g Cl. the compound's percent composition is 25.06%.
What are the application of carbon ?The impure form of carbon is Amorphous which is used for the manufacture of car batteries and dry cells, ink and paints; So the majority element of carbon is present in charcoal, so these are used as fuel.
Graphite is derivative form of carbon used as a lubricant in heavy industrial machinery, making pencil leads, these carbon are used in the production of steel.
The empirical formula, For carbon 3.01/12 = 0.2508
For oxygen 4/16 = 0.25, For Cl 17.81/35.5= 0.501, 0.2508 ÷ 0.25 = 1.0032
0.25 ÷ 0.25 = 1
0.501 ÷ 0.25 = 2.004
Empirical formula of the compound = CCl20
Then the Molar mass = (1×12) + (2×35.5) + (1×16)
= 12 + 71 + 16
= 99g/mol
percentage composition= 24.81/99 × 100
= 25.06%
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15) The chemical formula of a compound indicates the
A) relative proportions of the elements in the compound
B) identity of the elements in the compound only
C) type and arrangement of the bonds in the compound
D) three-dimensional structure of the compound
How does thermal energy flow?
Answer:
Thermal energy typically flows from a warmer material to a cooler material.
Explanation:
23.
What would happen to the substance in the jar if energy was added?
Answer:
it would explode
Explanation:
dont put that as an answer i need point for finals
carbondiooxide does not support in burning but mg burs in it why.?
To keep burning, fires require oxygen. Carbon dioxide is used in certain fire extinguishers to put out flames. Explanation: Because magnesium is higher on the reactivity scale than carbon, it is more reactive and eliminates oxygen from carbon dioxide (to give carbon and magnesium oxide).
PLEASE HELP I DON´T KNOW WHAT THE DIFFERENCE BETTWEEN THE TWO IS!
What is the difference between a product and a reactant.
Answer:
A reactant is a substance that is present at the start of a chemical reaction. A product is a substance that is present at the end of a chemical reaction.
Explanation:
match each statements with the state of matter it describes?
Answer:
Solid liquids , plasma gas
Explanation:
It retains its shape regardless of the shape of the container
The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and
Answer:
Electrons
Explanation:
Isotopes are atoms which have the same number of protons and electrons but a different number of neutrons. This is also the reason why there are no other changes in the atom but the mass of the specific atom changes.
Hope this helps :)
Merry Christmas. Have fun.
Passing an electric current through a sample of water (H2O) can cause the water to decompose into hydrogen gas (H2) and oxygen gas (O2) according to the following equation. 2H2O Right arrow. 2H2 O2 The molar mass of H2O is 18. 01 g/mol. The molar mass of O2 is 32. 00 g/mol. What mass of H2O, in grams, must react to produce 50. 00 g of O2? 14. 07 23. 05 28. 14 56. 28.
The mass of water decomposed to produce 50 g oxygen has been 56.28 g. Thus, option D is correct.
The reaction for the decomposition of water has been:
[tex]\rm 2\;H_2O\;\rightarrow\;H_2\;+\;O_2[/tex]
From the balanced equation, 2 moles of water decomposes to form 1 moles of hydrogen and 1 mole of oxygen.
The mass of oxygen produced has been 50 g. The moles of oxygen has been given by:
[tex]\rm Moles=\dfrac{mass}{molar\;mass}[/tex]
The moles of oxygen has been:
[tex]\rm Moles_O_2=\dfrac{50}{32}\;mol\\Moles_O_2=1.5625\;mol[/tex]
The moles of oxygen produced has been 1.5625 mol.
The moles of hydrogen decomposed has been given from the balanced chemical equation as:
[tex]\rm 1 \;mole\;O_2=2\;mole\;H_2O\\1.5625\;mol\;O_2=1.5625\;\times\;2\;mol\;H_2O\\1.5625\;mol\;O_2=3.125\;mol\;H_2O[/tex]
The moles of hydrogen decomposes has been 3.125 mol.
The mass of hydrogen decomposed has been given by:
[tex]\rm Mass=moles\;times\;molar\;mass\\Mass_{H_2O}=3.125\;\times\;18.01\;g\\Mass_{H_2O}=56.28\;g[/tex]
The mass of water decomposed to produce 50 g oxygen has been 56.28 g. Thus, option D is correct.
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I know the answer is A/1 but I’m not sure how to explain it, I would like some help on the explanation part
3. The accompanying diagram represents a cell in water. Formulas of molecules that can move freely across the cell membrane are shown. Some molecules are located inside the cell and others are in the water outside the cell.
(Picture) diagram
Based on the distribution of these molecules, what would most likely happen after a period of time?
A. The concentration of O₂ will increase inside the cell.
B. The concentration of CO₂ will remain the same inside the cell.
C. The concentration of O₂ will remain the same outside the cell.
D. The concentration of CO₂ will decrease outside the cell.
Answer:
number one is the correct option
How does the weather caused by a warm front compare to the weather caused by a cold front?
A: A warm front brings fog, but a cold front brings clouds that form from dry air.
B: A warm front brings rapid changes in weather, but a cold front brings slow changes in weather.
C: A warm front brings widespread cloud cover, but a cold front brings intense sun coverage.
D: A warm front brings rain in humid air on occasion, but a cold front brings thunderstorms in summer.
Answer:
The weather caused by a warm from and a cold front compare by:
D. A warm front brings rain in humid air on occasion, but a cold front brings thunderstorms in summer.
A warm front is a phenomenon in which a warm air mass replaces a cold air mass, creating fog and rain on one occasion. While the cold front is the replacement of a warm air mass by a cold air mass changing the pressure and creating a thunderstorm in the middle of summer. The warm front happens in zones close to the equator and the cold fronts happen in almost every place.
Hope that helps. x
Give atleast 5 differences in cell structures of plant and animal cells
typhoons are more violent than hurricanes
Answer:
i think it is FALSE.
Explanation:
good luck
Which statement best describes what happens to the stability of hydrogen and oxygen atoms when they form bonds in a water molecule?
Answer:
It's c
Explanation:
Because I've checked
Find the mass in kilograms of the liquid air that is required to produce 600L of oxygen. In normal condition, 1L of liquid air has 1.3g
Explanation:
1L is 1.3 g so 600L is 780 g
1kg= 1000g so
780 g = 0.78kg
I GUESS
Mass in kilograms of liquid air required = 0.78 kg
Given that
1 Litre of liquid air contains 1.3 grams of oxygen ( air )
Determine the amount of liquid air in Kg
volume of air given = 600 L
mass of liquid air required = x
1 litre = 1.3 grams
600 L = x
∴ x ( mass of liquid air ) = 1.3 * 600
= 780 g = 0.78 kg
Hence we can conclude that Mass in kilograms of liquid air required = 0.78 kg
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In 1980 the Mt. St. Helens volcano erupted and impacted thousands of square miles of forest.Some areas are still undergoing secondary succession where
Answer:
Explanation:
1: Pioneer species are the first to colonize: During primary succession in lava on Maui, Hawaii, succulent plants are the pioneer species. After weathering breaks down the lava into the soil, the plants are able to take root. These plants will help to further change the soil by adding nutrients to it.
The first organisms to appear in areas of primary succession are often mosses or lichens. These organisms are known as pioneer species because they are the first species present; pioneer species must be hardy and strong, just like human pioneers.
Pb2O4 has a ratio of 2:4. It needs to be reduced to?
A.) 1:0
B.) 2:0
C.) 1:2
D.) 2:2
Answer:
C
Explanation:
The reason why is because if you divide 2 by 2 you get 1 and 4 divided by 2 is 2. Hope this helps .
What is the pH of a substance that has [H+] = 0.0081?
8.1
-1.09
-8.1
1.09
what happens to glucose in the body?
After your body has used all the energy it needs, leftover glucose is stored in the liver and muscles. We can store enough fuel for about a day, if you haven't eaten in a while, your blood glucose level drops. :)
Hope this helps!
When potential energy is converted into kinetic energy, some of that energy is always in the form of:
А.
light energy
B.
chemical energy
с
nuclear energy
D
heat energy
What happens in cellular respiration?
The answer would be B.
When glucose reacts with oxygen, it forms an ATP that is used by the given cell. Co2 and h2O are the byproducts.