Answer:
B) N2H4
Explanation:
name 2 elements that are liquid at room temperature and describe their colour
Answer:
Bromine
Mercury
Bromine (symbol Br and atomic number 35) is a reddish-brown liquid, with a melting point of 265.9 K. Mercury (symbol Hg and atomic number 80) is a toxic shiny silvery metal, with a melting point of 234.32 K.
a) Explain the changes in the following properties when going across Period 3 from
sodium (Na) to argon (Ar).
i. The element's reactivity towards oxygen
ii. The electrical conductivity of the oxides
Answer:
The ironization energies increase as you go across the period So the electrical conductivity of the oxides is your answer
Nguyên tử X có tổng số hạt là 34, số khối X là 56. Điện tích hạt nhân của X là?
Answer:
can u tell the question in english
Relate microscopic bonding properties to solid state properties
There are many factors that we can take into account when attempting to relate microscopic bonding properties to solid-state properties, for example, the rigid and immobile nature of solid states and their molecular bonds.
Solid-state properties are simply put, the properties we can observe and measure when studying an element in solid form. These solids have specific characteristics such as:
Structural rigidityThey do not change shapeDo not change the volume they occupyand so on, which although not initially obvious, are caused by the microscopic molecular bonds of their atoms.
The microscopic properties of solids are very similar to that of the solid-state properties. The atoms of a solid are very close together and strongly bonded to one another, because of this the atoms form a very rigid structure that resists changes to their shape or volume, much like the macroscopic properties of the solid. This serves to show how these properties may cause the solid-state effects we can observe normally.
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Hydrogen fusion creates _____ and lots of energy.
Explanation:
Fusion processes require fuel and a confined environment with sufficient temperature, pressure, and confinement time to create a plasma in which fusion can occur. The combination of these figures that results in a power-producing system is known as the Lawson criterion. In stars, the most common fuel is hydrogen, and gravity provides extremely long confinement times that reach the conditions needed for fusion energy production. Proposed fusion reactors generally use hydrogen isotopes such as deuterium and tritium (and especially a mixture of the two), which react more easily than hydrogen to allow them to reach the Lawson criterion requirements with less extreme conditions. Most designs aim to heat their fuel to around 100 million degrees, which presents a major challenge in producing a successful design.
As a source of power, nuclear fusion is expected to have many advantages over fission. These include reduced radioactivity in operation and little high-level nuclear waste, ample fuel supplies, and increased safety. However, the necessary combination of temperature, pressure, and duration has proven to be difficult to produce in a practical and economical manner. Research into fusion reactors began in the 1940s, but to date, no design has produced more fusion power output than the electrical power input.[1] A second issue that affects common reactions is managing neutrons that are released during the reaction, which over time degrade many common materials used within the reaction chamber.
Fusion researchers have investigated various confinement concepts. The early emphasis was on three main systems: z-pinch, stellarator, and magnetic mirror. The current leading designs are the tokamak and inertial confinement (ICF) by laser. Both designs are under research at very large scales, most notably the ITER tokamak in
how much heat will we use when 30 grams of ice turns into water at 30 degrees Celsius?
Answer:
more heat
Explanation:
more heat bro , more heat
Explanation:
The answer is given in the question
Which is the correct name for the covalent compound that
contains five oxygen atoms and two phosphorus atoms?
a Diphosphorus pentoxide
b Pentaoxygen diphosphide
C Phosphorus oxide
d Pentaoxygen diphosphorus
The correct name for the covalent compound that contains five oxygen atoms and two phosphorus atoms is Diphosphorus pentoxide.
The covalent compound has a combination of phosphorus and oxygen.
The oxygen atoms is 5 and the phosphorus atoms is 2.
Therefore, the combination can be represented chemically as follows:
P₂O₅The standard name for this compound is Diphosphorus pentoxide.
The prefix di simply means phosphorus is 2 atoms.
The pent indicates 5 atoms of oxygen.
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What is the limiting reactant from this equation
Answer:
A Option is the correct answer.
Explanation:
A reaction mixture initially contains 0.236 mol FeS and 0.670 mol HCl. Once the reaction has reached completion, what amount (in moles) of the excess reactant is left
Answer:
= 0.198 mole H₂S in excess
Explanation:
A quick way to determine limiting reactant is to convert reactant values given to moles and divide by respective coefficient. The smaller value is the limiting reactant other reactants will be in excess. However, when working problem, use mole values given to solve, not results of division.
FeS + 2HCl => FeCl₂ + H₂S
0.236mole/1 0.670mole/2
= 0.236 = 0.335
limiting reactant is FeS; HCl will be in excess.
Problem solution
0.236mole FeS used + 2(0.236 mole HCl used)
=> 0.236 mole FeCl₂ + 0.236 mole H₂S + (0.670 - 0.472) mole HCl in excess or, 0.198 mole H₂S in excess.
Hope this helps. :-)
Why do we need to build models of molecules to study atomic composition?
Answer:
for better understanding and visual understanding
Which of these properties is mainly responsible for the difference in
melting rate between salt water and fresh water?
O acidity
O temperature
G
O density
O mass
Answer:
Density is mainly responsible for the difference in melting rate between salt water and fresh water.
Explanation:
Hoped this helped.
What two things does pure substances have?
a.) Different chemicals and different properties.
b.) Same chemicals and different chemical properties.
c.) Same chemicals and same physical properties.
d.) Same chemicals and same chemical properties.
(e) alkaline earth element with the least massive atoms
The alkaline earth element with the least massive atoms is beryllium (Be). Beryllium, located in Group 2 of the periodic table, possesses the lowest atomic number and atomic mass within the alkaline earth elements.
Among the alkaline earth elements, which are found in Group 2 of the periodic table, beryllium (Be) stands out for having the least massive atoms. The periodic table is organized in a way that elements are ordered by increasing atomic number, which corresponds to the number of protons in an atom's nucleus. For alkaline earth elements, the atomic numbers increase from beryllium (Be) with atomic number 4 to radium (Ra) with atomic number 88.
Atomic mass, on the other hand, takes into account the sum of protons and neutrons in an atom's nucleus, as electrons contribute very little to the overall mass. Since beryllium (Be) has the lowest atomic number in the alkaline earth group, it also has the fewest protons and neutrons among its isotopes, leading to a lower atomic mass compared to other elements in the same group.
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People use solution of Na3PO4 to clean walls before putting up wall paper. If the entration is 1.7% (m/v). What mass of Na3PO4 is needed to make 2L of solution?
Answer:
34 grams
Explanation:
Assuming m/v means mass of solute / volume of solvent, then set up the equation:
1.7/100=m/2000, by cross multiplication, m=34 grams
What’s the frequency of radiation that has a wavelength of 13 um, about the size of bacterium?
Answer:
2.3)X10^13-Hz
Explanation:
What’s the frequency of radiation that has a wavelength of 13 um, about the size of bacterium?
a micro meter is 10^-6 meter
frequency of light times wavelength = c the speed of light 3X10^8 M/sec
so
frequency times 13 X10^-6 =3X10^8 M/
so
FR3EQUENCY = 3X10^8/13X10-6
=(30/13)10^13 =2.3)X10^13-Hz
7 X
6
He says that because the oxygen atoms are split between two different molecules in the products, the equation does not support the law of conservation of matter. Is your friend right? explain your answer?
According to conservation of matter, there should be equal amounts of all elements on both the reactant and product side.
Reactant:
1 Ca
1 C
1 O
Product:
1 Ca
1 C
3 O
Therefore, your friend is right because the law of conservation of matter is not followed in this chemical equation.
hidrógeno
notacion electronica
Answer:
Hydrogen
Electronic notation
Explanation:
What is the expression for the equilibrium constant for the
reaction N2+ 3H2 = 2NH3?
Answer:
For the reaction N2 + 3H2 2NH3 , the equilibrium expression may be written as K [ NH3 ]^2/ [ N2 ] [ H2 ]^3 .
Explanation:
Answer:
s K [ NH3 ]^2/ [ N2 ] [ H2 ]^3 .
Explanation:
because I know -_-
What happens to the kinetic energy of the bowling ball when it reaches the pins?
Answer:
The bowling ball has kinetic energy as it moves toward the pins.
Explanation:
Answer:
Most of it is transferred to the pins, but some of it is changed into heat and sound energy.
Explanation:
study island
How much heat is required to increase the temperature of 150 g of water from
38°C -55°C?
Answer:
-55°C
Explanation:
Bwcause 38°C is gonna make it colder so thats why you should use that.
Paano mo mapapanatili na gumagana ang iyong negosyo sa gitna ng pandemic na ito?
Tingnan ang pinakamahuhusay na kagawian at patnubay sa pampublikong kalusugan para mapanatiling ligtas ang iyong mga customer at tauhan.
HOPE IT HELPS:)
PLS FOLLOW:)
#BRAINLIEST
I need this done soon!
What is a saturated solution?
A. A solution with as much dissolved solute as it can hold at a given temperature.
B. A heated solution with more dissolved solute can hold at a lower temperature.
C. A solution that holds less dissolved solute than is possible at a given temperature.
D. A solution that holds as much solvent as possible at all temperatures.
Answer: A
Explanation:
A saturated solution is a chemical solution that contains the highest bound solvent level. In a saturated solution, the extra solution will not dissolve. Depending on a multitude of variables, the quantity of fluid that can we can add in a solvent to create a saturated solution.
True or false?
Increasing the temperature can help slow down chemical reactions by "burning away" unnecessary molecules
What kind of fault movement will create a tsunami?
Answer:
I THINK IT'S BECAUSE THE EARTH UNDER THE SEA SHIFTS AND THE VIBRATION OF THE WATER GETS BIGGER UNTIL IT BECOMES A TSUNAMI. BRAINLIST ???
HELPP PLISS :(
Achemist analyzes two samples. One sample contains 14 g of element X and 6.0 g of element Y. The second sample contains 28 g of element X and 6.0 g of element Y. Does it appear that the two samples are the same substance? Explain the reasons for your answer.
A chemist analyzes two samples. One sample contains 14 g of element X and 6.0 g of element
Fruit juice when boiled taste sweeter than sucrose because
Answer :see explanation
Explanation:
the sweet carbohydrate in fruit is not sucrose , it is fructose.
and fructose tastes sweeter than sucrose
fructose and glucose minus water equals sucrose
and fructose is sweeter than glucose
list several characteristics of ligroin
- Petroleum fraction consisting mostly of [tex]C_{7}[/tex] and [tex]C_{8}[/tex] hydrocarbons
- The fraction is also called heavy naphtha
- Boiling in the range 90‒140 °C
- Ligroin is used as a laboratory solvent
- Ligroin it also esed as a motor fuel or as a solvent for fats and oils in dry cleaning
[] All of these are different characteristics of ligroin
[] If you need more let me know
Have a nice day!
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- Heather
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Please draw the complete chemical structure of the tripeptide having the amino acidsequence: Asp-Leu-Ser
Answer:
I got you... 2 amino acids are linked to each other by a peptide linkage. A peptide linkage is formed when carboxyl group of one amino acid combine with the amine group of the other and during this process, a water molecule is removed.
The given tripeptide will have 2 peptide bonds. To draw the structure of given tripeptide, we will arrange them in the given order and then we will remove 2 water molecules to form 2 peptide bonds.
Explanation:
Hope this helps:)
Why is there an octet rule in writing Lewis structures?
Answer:
Before we can sketch the Lewis structures of molecules, we must first understand the octet rule. The octet rule asserts that when atoms combine to create compounds, electrons are gained, lost, or shared among them, resulting in a stable electron configuration defined by eight valence electrons as a result. These rules are used in conjunction with the main-group components of the second period.
Explanation:
Hope it helps:)
What is the chemical composition of shale?
Answer:
30.8 percent quartz, 4.5 percent feldspar, 3.6 percent carbonate, <0.5 percent iron oxides, 60.9 percent clay minerals, 1 percent organic material, and 2 percent other materials.