Answer:
8
Explanation:
Answer:
the answer is 8 :D
Explanation:
2x4 also known as 2+2+2+2 is equal to 8
What best describes what models are used for?
A. Models are used as substitutes for compounds.
B. Models are used to explain how something works.
C. Models are used to perform experiments.
D. Models are used to develop new technologies.
Explanation:
is b or c but i think asnwer is b
The correct statement is " Models are used to explain how something works."
What is model?To introduce specific content, models might be employed. A model can help students learn crucial words and create a setting in which they can investigate pertinent processes.
Models can be used to improve explanations, promote discussion, make predictions, present graphical images of abstract concepts, and generate mental models in research.
Therefore, Models are used to explain how something works .
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Most molecules in life are made up of complex molecules based around which of the following type of atoms?
Nitrogen
Carbon
Oxygen
Helium
Answer:
Carbon is the answer. hope that helped
Which set of elements below is the most similar in chemical behavior?
OH, Be, SC
O Fr, Ra, Rf
O TI, V, Cr
O Be, Ca, Ra
Answer: Be, Ca, Ra
Explanation:
Elements are distributed in groups and periods in a periodic table.
Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.
Berrylium (Be) , Calcium (Ca) and radon (Rn) are elements which belong to Group 2. They have 4, 20 and 88 electrons respectively and contain 2 valence electrons each and thus can lose two electrons to complete their octet. Thus they will show similar chemical properties.
The chemical reactivity of elements is governed by the valence electrons present in the element.
which chemical equation represents a redox reaction?
Answer:
B if i'm not mistaken.
Explanation:
How many grams are in 3.01 x 1024 molecules of H2SO4
Answer:
490. g H₂SO₄
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.01 × 10²⁴ molecules H₂SO₄
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of H - 1.01 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol
Step 3: Convert
[tex]3.01 \cdot 10^{24} \ molecules \ H_2SO_4(\frac{1 \ mol \ H_2SO_4}{6.022 \cdot 10^{23} \ molecules \ H_2SO_4} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )[/tex] = 490.287 g H₂SO₄
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
490.287 g H₂SO₄ ≈ 490. g H₂SO₄
PLEASE HELP CHEMITRY!
What happens to the binding energy of lighter elements when they undergo fusion?
What is the most stable nucleus (the one with the highest binding energy)?
What happens to the binding energy of elements like uranium when they undergo fission?
Why does the fusion of elements beyond iron in our universe require a supernova? Use this diagram to explain your answer.
Answer:
.
Explanation:
Answer:
1) In fusion reactions, two light atomic nuclei fuse together to form a heavier nucleus. In doing so, they release a comparatively large amount of energy that arises from the binding energy, creating an increase in temperature of the reactants.
2) iron-56
3) When a large, fissile atomic nucleus such as uranium-235 or plutonium-239 absorbs a neutron, it may undergo nuclear fission. However, one neutron does collide with an atom of uranium-235, which then splits and releases two neutrons and more binding energy.
4) Iron cannot release energy by fusion because it requires a larger input of energy than it releases. This energy blows the outer layers of the star off into space in a giant explosion called a supernova (plural: supernovae.)
have you tried G o o g l e
which would indicate the water in a lake is not safe for drinkinh
Answer:
Explanation:
Alge. Waste and dead things
what is wrong with you how cant you do this I'm not being mean I'm just asking dont answer if you dont want to its ur life
is graph paper a homogeneous or heterogeneous mixture
Answer:
There is no chemical symbol for paper since it is not an element but rather a mixture of several different compounds. Mixtures in two or more phases are heterogeneous mixtures.
Explanation:
put the following in order from LARGEST TO SMALLEST nuclueus,molecule,electron,atom,proton and a teacher
Answer:
electron, proton, nucleus, atom, molecule teacher
on this graph below, the independent variable is
Select all that apply tomitosis (Choose 4)
A
Muscle cells reproduce this way
B
Does not require a male and female to reproduce.
C
Results in the production of gametes
D
Final cell is identical to parent cell
E
Repairs skin following sunburn
F
Final cell has only half of the parent's DNA
G
Requires a male and female to reproduce
H
Results in the production of haploid cells.
Scientists can engage in many different activities in many different sequences.
Question 2 options:
when using the scientific method.
when convincing peers they have all the answers.
when proving the existence of aliens.
when explaining and documenting their work
Answer:D-when explaining and documenting their work
Explanation:I took the k-12 test and got it right!:) Hope this helps!!!!
Scientists can engage in various activities in various sequences. It can be best explained by documenting and explaining their work. Thus, option D is correct.
What is the scientific method?The scientific method has been a series of events that uses observed phenomena to conduct research by testing the hypothesis that raises the question. It conducts the experiment and reaches the results to conclude the findings.
In various scientific sequences, scientists can be engaged at a time similar to explaining and documenting the work involves representation of the proper rationale and its deep and thorough explanation so to justify the hypothesis and its accountability.
Therefore, option D. the explanation and documentation are the various activities involved in different sequences.
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I need to know what the matter is of a tree
Answer:
heterogenous mixture i believe.
Explanation:
Which of the following explains the VSEPR geometry of a carbon tetrachloride molecule? (5 points)
:Č:
:Č-c- CI:
:CI:
OIt is bent because there are four bonded pairs around carbon.
OIts tetrahedral because there are four bonded pairs around carbon.
OIt is bent because there are two bonded pairs and two lone pairs around carbon.
OIts tetrahedral because there are two bonded pairs and two lone pairs around carbon.
Answer:
B) It is bent because there are four bonded pairs around carbon.
Explanation:
Since carbon forms a single bond with all four chlorides (four domains), the shape and geometry will both be tetrahedral. There are no lone pairs of electrons that cause the shape to appear bent.
Its tetrahedral because there are four bonded pairs around carbon. This explains the VSEPR geometry of a carbon tetrachloride molecule. Therefore, the correct option is option B.
What is VSEPR geometry?
The acronym VSEPR (pronounced "vesper") is frequently used to refer to the model known as Valence Shell Electron Pair Repulsion Model. The model essentially predicts the shape of molecules. In particular, organic compounds and polyatomic ions' bonding & molecular geometry are examined by VSEPR models. Almost all compounds with a central atom which is not a metal can benefit from it.
Due to their two-dimensionality, Lewis structures can only reveal the quantity and kind of atom-atom bonds. The 3-D shapes of ions and molecules are predicted by the VSEPR model, but it is unable to offer any exact details on the bond length and the bond itself. Its tetrahedral because there are four bonded pairs around carbon. This explains the VSEPR geometry of a carbon tetrachloride molecule.
Therefore, the correct option is option B.
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Given the nuclear equation:
232U + In → Ba + Kr + 3}n + energy
28.
State the type of nuclear reaction represented by the equation.
Answer:
Nuclear fission
Explanation:
Even though the equation is not too clear, however, we can see that the uranium nucleus was bombarded with a particle leading to its disintegration to yield other nuclides.
A nuclear fission reaction is one in which a heavier nuclide is bombarded with a particle (usually a neutron) leading to the disintegration of that nuclide into other nuclides with the release of tremendous energy. More neutrons are released in the process to continue the reaction. Hence, it is a chain reaction.
what elements react with mercury?
fluorine, F2, chlorine, Cl2, bromine, Br2, or iodine, I2
How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?
a. by measuring how fast sea-floor spreading occurs
b. by observing eruptions of molten material on the seafloor
c. by determining the age of rock samples obtained by drilling on the seafloor
d. by mapping rocks on the seafloor using sonar
Scientists discover that rocks farther away from the mid-ocean ridge were older than those near it by C. determining the age of rock samples obtained by drilling on the seafloor.
According to the scientists, it was noted that new oceanic crusts were formed at the mid-ocean ridges. When it cools down, then the magnetic field during its formation is recorded.
The magnetic stripes become older when they move away from the mid-ocean ridge. The geologic dating technique was used in the seafloor rocks. It was found that the youngest rocks were at the mid-ocean ridges while the rocks get older due to their distance from the ridge crest.
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Lets say a giant radioactive monster is attacking
Phoenix. This monster is so radioactive and big the air in
Feels easily over 120°. Is this an endothermic or
exothermic reaction?
Answer: exothermic reaction
The monster is releasing heat energy to the environment surrounding it. The term "exo" means "outside".
In contrast, an endothermic reaction is one where energy is absorbed from the environment to cool down the surrounding air.
At constant temperature, the behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased because the.
At constant temperature, the behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased because there is an increase in the average distance between the molecules.
In chemistry, real gas does not obey gas laws under all conditions of pressure and temperature.
On the other hand, an ideal that obeys gas laws has negligible interaction and space among the molecules.
For an ideal gas, if the temperature is kept constant then the average speed and kinetic energy of the molecules remain unchanged.
Neither the size of molecules changes.
Under such conditions, it can be concluded that the ideal gas does not expand and its volume remains the same.
However, the distance between molecules increases for a real gas as its molecules expands under different temperatures and volume increases.
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Given the unbalanced equation below, answer the following: Calculate the number of liters of 3.00 M lead (II) iodide solution produced when 1.66 mol Kl react?
Pb(NO3)2 + 2KI → 2KNO3 + PbI2
The number of liters of 3.00 M lead (II) iodide : 0.277 L
Further explanationReaction(balanced)
Pb(NO₃)₂(aq) + 2KI(aq) → 2KNO₃(aq) + PbI₂(s)
moles of KI = 1.66
From the equation, mol ratio of KI : PbI₂ = 2 : 1, so mol PbI₂ :
[tex]\tt \dfrac{1}{2}\times 1.66=0.83[/tex]
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
So the number of liters(V) of 3.00 M lead (II) iodide-PbI₂ (n=0.83, M=3):
[tex]\tt V=\dfrac{n}{M}\\\\V=\dfrac{0.83}{3}\\\\V=0.277~L[/tex]
I need help:< for my chemistry class we have to write the equation at first it says "Expand the right side by multiplyig each term. that is... 5 x 27 = 135 and 5 x 3a = 15a
so i get "2a = 135 -15a i just want to know how i have to write the equation because i suck at Math i'm so bad at it. Pls gave me some help!!!
The value of 'a' is 7.9
Chemical equations - chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.
Balancing of chemical equation is necessary because the law of conservation of mass states that during a chemical reaction, matter cannot be generated or destroyed. This is only conceivable if the total number of atoms on the reactants' and products' sides is identical. A chemical reaction should therefore always be in balance.
According to the given equation-
2a = 135 - 15a
2a + 15a = 135
17 a = 135
a = 135/ 17
a = 7.9
You can solve it by simply transferring the variables on one side and the constants on the other side. When you transfer -15 a on the left side it becomes =15a. now, 2a + 15 a is 17 a.
For taking out the value of 'a' simply divide 135 by 17.
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a homogeneous mixture has the same composition throughout, while a heterogeneous mixture has different compositions in different regions.
This is the difference between a homogeneous and a heterogeneous mixture.
For example, salt (NaCl) and water make a homogeneous mixture (the same proportions of its components throughout any given sample), because both substances are polar.
A solution is homogeneous mixture composed of two or more substances.
In aqueous solution, a solvent is water and solute (in this example sodium chloride) is a substance dissolved in water.
A heterogeneous mixture is not uniform in composition (in this mixture different metals and minerals), but proportions of its components (for example mixture particles of different colors, small pebbles) vary throughout the sample.
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Is Sucrose a ionic or covalent bond
Answer:
covalent bond
Explanation:
hope this helps :D
Planets that orbit closer to the Sun than Earth have ____ years than we do.
Answer:
Well, it depends on where they are orbiting! Planets that orbit closer to the Sun than Earth have shorter years than Earth. Planets that orbit farther from the Sun than Earth have longer years than Earth.
Write the complete and net ionic equation for the following reaction:
Al2(SO4)3(aq) + Mg(OH)2(aq) → MgSO4(aq) + Al(OH)3(s)
Answer:
Al2(SO4)3 + 3Mg(OH)2 → 2Al(OH)3 + 3MgSO4
Explanation:
measuring carbon dioxide burning fuels in power plants and motor vehicles emits carbon dioxide, which may continue to global warming
A major contributor to global warming is the usage of personal vehicles. For every gallon of gas, vehicles and trucks generate about 24 pounds of carbon dioxide and other greenhouse gases, making up approximately one-fifth of total US emissions.
Our national security is under risk, and other fundamental human necessities are also threatened by global warming. Some effects, like as extreme flooding and droughts, rising sea levels, and record-high temperatures, are already happening more frequently.A major contributor to global warming is the usage of personal vehicles. For every gallon of gas, vehicles and trucks generate about 24 pounds of carbon dioxide and other greenhouse gases, making up approximately one-fifth of total US emissions. The extraction, manufacture, and distribution of the fuel account for about five pounds, whereas the majority of heat-trapping emissions—more than 19 pounds per gallon—come directly from a car's tailpipe. Vehicles that are more fuel-efficient require less fuel to cover the same distance as their inefficient counterparts. Less fuel consumption results in fewer emissions.CO2 emission leads to global warming.
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_Cl2 + _NaBr → _NaCl + _Br2
Answer: 1,2,2,1
If someone gave you flour, sugar, butter, eggs, baking soda, and salt, what could those ingredients turn into?
Answer:
You can make Cake CAke Cake Cake and other stuff too Ig
Explanation:
which of these waves cannot travel through the vacume of space
a. microwaves
b. radio waves
c. light waves
d. sound waves
Answer
the answer is sound waves have a nice night
Explanation:
Answer:
sound waves
Explanation:
Sound can't travel in space
What’s the answer???
Answer:
D
Explanation:
Answer:
C - Up and Down in a Circle
Explanation:
Waves are actually energy passing through the water, causing it to move in a circular motion. When a wave encounters a surface object, the object appears to lurch forward and upward with the wave, but then falls down and back in an orbital rotation as the wave continues by, ending up in the same position as before the wave came by.