Answer:
Temperatures decrease with increasing height as the ozone layer is left behind and the air thins out with increasing altitude. The lowest portion of the low-pressure mesosphere is heated by the warm air of the upper stratosphere. This heat radiates upward, getting less intense as altitude increases.
Explanation:
Brainliest please?
True testing means that a serious effort is made to _________.
Question 8 options:
be absolutely positively, without a shadow of a doubt, correct.
create experiments that support your hypothesis
falsify (“disprove”) each possible explanation.
complete testing that supports manufacturers claims, so you can cash in and make money.
Explanation:
This explanation is the opposite of true testing - a term known as falsifiability. Falsifiability, when it relates to science, refers to how it should be possible to prove a hypothesis or theory wrong. Thus, the point of testing for falsifiability is to test in which condition is the theory wrong.
A term that might relate to the phrase ‘true testing’ used in the question would be testability. Which refers to the practice of testing a hypothesis or theory to see whether it is true or false.
True testing has been the scientific method that uses various steps to conclude the findings. "True testing means that a serious effort is made to create experiments that support your hypothesis." Thus, option B is correct.
What is True testing?True testing has been defined as the assessment scientific method that is involved in solving the question and issue by formulating the hypothesis and then researching the possible observations and solution that concludes and proves the findings.
It falsifies or proves the hypotheses right or wrong based on the experimental design setup. It does not falsify each possible explanation, nor is always fully correct. It also is not conducted to support the manufacturing and support it financially.
Therefore, option B. True testing experiments to sustain the hypothesis.
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Which chemical equation represents a decomposition reaction?
O A. 2C2H6 + 702 + 4CO2 + 6H20
O B. AgNO3 + LiCl → AgCl + LINO3
O C. Ca + MgS → CaS + Mg
O D. 2H20 2H2 + O2
Decomposition reaction D. 2H20⇒ 2H2 + O2
Further explanationEvery chemical reaction involves a compound consisting of reactants and products
Reactants are compounds that react and form new compounds called products
There are several forms of reactions that can occur, including single replacement, double replacement, synthesis, decomposition, etc.
A. 2C2H6 + 702 ⇒ 4CO2 + 6H20
Combustion : reaction of Hydrocarbon and Oxygen
B. AgNO3 + LiCl → AgCl + LINO3
Double replacement : there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
C. Ca + MgS → CaS + Mg
Single replacement :one element replaces the other elements of a compound to produce new elements and compounds
D. 2H20⇒ 2H2 + O2
Decomposition : One compound breaks down into 2 components
Decomposition, often known as rot, is the breakdown of dead organic matter into more basic organic or inorganic components such as carbon dioxide, water, simple sugars, and mineral salts. Here among the given options, the decomposition reaction is 2H₂O→ 2H₂ + O₂. The correct option is D.
Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. For instance, the thermal breakdown of potassium chlorate (KClO₃) is a typical technique used in laboratories to generate oxygen gas.
Soft drink carbonic acid breaks down to release carbon dioxide gas. As water breaks down, gases like hydrogen and oxygen are released. Food digestion is a response to breakdown.
Thus the correct option is D.
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What type of plate boundary forms
snowy mountains?
J. convergent
K. divergent
L. transform
M. transition
Answer:
I believe it's j, convergent plate boundaries
The type of plate boundary that forms snowy mountains are convergent plate boundaries. option J is correct.
What are convergent plate boundaries?The convergent plate boundaries are which consist of two plates that move toward each other which results in the process called collision of two plates with each other.
The snowy mountains are full of snow which melts due to the change in temperature and leads to the formation of different plates and boundaries and the collision of two continental plates leads to the formation of this.
Therefore, option J is correct, the type of plate boundary that forms snowy mountains are convergent plate boundaries.
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CaO + H2O -> Ca(OH)2
3.50g of Ca(OH)2 was made from 4.20g of CaO? What is the % yield of Ca(OH)2?
The % yield of Ca(OH)₂ : 62.98%
Further eplanationPercent yield is the compare of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
CaO + H₂O ⇒ Ca(OH)₂
mass CaO= 4.2 g
mol CaO(MW=56,0774 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{4.2}{56,0774 g/mol}\\\\mol=0.075[/tex]
mol Ca(OH)₂ based on mol CaO
mol ratio CaO : Ca(OH)₂,= 1 : 1, so mol Ca(OH)₂ = 0.075
mass Ca(OH)₂(MW=74,093 g/mol) ⇒ theoretical
[tex]\tt mass=mol\times MW\\\\mass=0.075\times 74,093 g/mol\\\\mass=5.557~g[/tex]
% yield :
[tex]\tt =\dfrac{actual}{theoretical}\times 100\%\\\\=\dfrac{3.5}{5.557}\times 100\%\\\\=62.98\%[/tex]
9.25x10^-8 x6.40x10^3 in scientific equation
Answer:
5.92E-4 or 5.92x10^-4
Explanation:
Based on the diagram, which statement explains how energy is conserved
during this chemical reaction?
А
B
Potential energy
of a system
С
Reaction progress
O A. The potential energy gained by the reaction system (A) is lost
from the surroundings.
B. The potential energy lost by the reaction system (C) is gained by
the surroundings
C. The potential energy changes indicated by A and B involve energy
lost by the surroundings.
D. The potential energy lost during the formation of products (B) is
lost by the surroundings.
PLEASE HELP and try not to get it wrong :(
Answer:
it's B it's B It's B BBBBBBBBBBBBBBB
BOYLES LAW
GUYS PLZ HELP ME WITH THESE TWO
ILL CHOOSE U BRAINLIEST
use the formula p1v1= p2v2
for 1
300×300=500×x
x=180ml
Which of the following best represents and explains the formula for a compound made from fluorine and hydrogen?
A. HF, because both fluorine and hydrogen are capable of forming only one ionic bond.
B. HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
C. H2F, because fluorine is short of two electrons, and hydrogen is short of one electron.
D. H2F, because fluorine is capable of forming one, and hydrogen is capable of forming two covalent bonds.
Thank you
The answer is B
HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond. The correct option is option B.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion. Covalent bond is weaker than ionic bond.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron.
The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
Therefore, the correct option is option B.
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2 Na + Cl2 --> 2 NaCl
According to the balanced equation above, how many Lof Cl2 at STP are
needed to completely react with 25.0 g Na?
Answer:
12.208 L
Explanation:
We'll begin by calculating the number of mole in 25 g of Na. This can be obtained as follow:
Mass of Na = 25 g
Molar mass of Na = 23 g/mol
Mole of Na =?
Mole = mass /Molar mass
Mole of Na = 25/23
Mole of Na = 1.09 moles
Next, we shall determine the number of mole of Cl2 required to react with 1.09 moles of Na. This can be obtained as follow:
2Na + Cl2 –> 2NaCl
From the balanced equation above,
2 moles of Na reacted with 1 mole of Cl2.
Therefore, 1.09 moles of Na will react with = (1.09 × 1)/2 = 0.545 mole of Cl2.
Thus, 0.545 mole of Cl2 is needed for the reaction.
Finally, we shall determine the volume of Cl2 required for the react as follow:
Recall: 1 mole of any gas occupy 22.4 L at STP.
1 mole of Cl2 occupied 22.4 L at STP.
Therefore, 0.545 mole of Cl2 of Cl2 will occupy = 0.545 × 22.4 = 12.208 L at STP.
Therefore, 12.208 L of Cl2 is needed for the reaction.
51 liters of helium and 29 liters of oxygen (O2), both at 35°C and 1.0
atmosphere, are pumped into a tank that has a volume of 5 liters. Calculate the number
of moles of each component and the total pressure in the tank at 35°C
Answer:
If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, ... If I contain 3.0 moles of gas in a container with a volume of 60. liters and at a ... Mixtures of helium and oxygen are used in scuba diving tanks to help prevent ... volume of 5.00 Lat 25.0C. Calculate the partial pressure of each gas and the ...
Explanation:
The main product of the photosynthesis reaction is
OA.
protein.
OB.
sugar.
Oc.
fat.
OD.
DNA.
Answer: Sugar
Explanation: Because after photosynthesis (Carbon dioxide, water, and sunlight) react, they make two products. Glucose (A sugar) and Oxygen.
4)
What is the mass of the gas that exactly fills a 200.0 ml container?
The density of the gas is 5 g/ml.
Answer:
1000 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 5 × 200
We have the final answer as
1000 gHope this helps you
She remembered that chemical equations can summarize what happens in a chemical reaction. What is the name of the two parts found on the left side of the equation below? 4 Fe + 3O2 → 2Fe2O3 A. products B. reactants C. scientific notation D. synthesis
Answer:
The name of the two parts found on the left side of the equation is reactants.
Explanation:
Chemical reaction is the way one substance reacts against another. That is, a chemical reaction is that chemical process in which two or more substances, by the action of an energy factor, are converted into other substances. The new substance (s) that are formed usually present a totally different appearance from that of the starting substances.
In a chemical reaction there are the substances that react, that is, the reactants, and the substances produced, called products.
A chemical reaction is represented by a chemical equation. The formulas of the reactants are written on the left, and those of the products on the right, both separated by an arrow indicating the direction of the reaction.
Reactants ⇒ Products
Then, the name of the two parts found on the left side of the equation is reactants.
Sulfur dioxide gas reacts with oxygen to form sulfur trioxide gas, as represented by the equation2 SO2(g) + O2(g) <---->2 SO3(g) ∆H = −197.8 kJ ....In order to obtain the equilibrium system above, 2.60 mol of SO2(g) and 2.30 mol of O2(g) are injected into a 1.00 L container. When the system reaches equilibrium, the concentration of the remaining SO2(g) is 1.32 mol/L. The concentration of O2(g) at equilibrium is ________ mol/L. (do NOT write units, simply give a 3-digit numeric answer
Answer:
1.66mol/L remain
Explanation:
Based on the reaction:
2 SO2(g) + O2(g) ⇄ 2 SO3(g) ∆H = −197.8 kJ
2 moles of SO2 react per mole of oxygen. To find the concentration of SO2 we need to see the moles of SO2 that react to find thus moles of oxygen that react and the moles and concentration of O2 that remains in the equilibrium:
Moles SO2 that remain:
1.32mol /L = 1.32moles of SO2 remains
2.60 initial moles - 1.32moles that remains = 1.28 moles of SO2 react
Moles O2 that reacted:
1.28 moles SO2 * (1mol O2 / 2mol SO2) = 0.64 moles O2
Moles O2 that remain:
2.30 moles O2 - 0.64 moles = 1.66 moles remain
And concentration is:
1.66moles / 1L =
1.66mol/L remainList the metals and non metals in BaF
Answer:
Ba is a metal while F is non metal
To make a balanced equation, 6 H2O + 6 CO2 ---> C6H12O6 + _
Answer:
6O₂
General Formulas and Concepts:
Chemistry/Biology
Photosynthesis Equation: 6H₂O + 6CO₂ → C₆H₁₂O₆ + 6O₂Explanation:
Most of the equation comes from the Photosynthesis Equation. Plants take in water and carbon dioxide and sunlight (energy) to produce glucose and oxygen. When we balance the equation and predict reaction. we should get 6O₂ as our answer.
Which of the following molecules has a central atom with precisely two unshared
pairs of electrons?
Mass Number
19
Atomic Number
Elements
Fluorine
Neon
Aluminium
Phosphorus
10
13
15
a. i. Which of the elements would not be capable of forming compounds
Answer:
Explanation:
The atomic number is the number of protons inside the nucleus of an atom. ... 1.1% carbon 13 with 7 neutrons and a mass of 13.00335 u (measured), and a ... The value given is the mass number of the most stable isotope of that element. ... That's because the chemistry of helium is more like neon (Ne), argon (Ar), etc.
Chemistry
How many Fluorine ions are there in 202 grams of CaF2
HINT: Find the percentage of Fluorine in Calcium Fluoride, then find out how many grams of fluorine are in 200 grams of Calcium Fluoride. Lastly solve for ions
There are 48.72 g Fluorine ions
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
%F in CaF₂ :
[tex]\tt \%F=\dfrac{2.Ar~F}{MW~CaF_2}\times 100\%\\\\\%F=\dfrac{2.19}{78}\times 100\5=48.72\%[/tex]
mass of Fluorine :
[tex]\tt 48.72\%\times 200=97.44~g[/tex]
So mass Fluorine ions(2 ions F in CaF₂⇒Ca²⁺+2F⁻) :
[tex]\tt =\dfrac{97.44}{2}=48.72~g[/tex]
How many molecules are in 4.5 moles of Ca(OH),?
We will use dimensional analysis to solve this.
We will need to know Avogadro's number, which is 6.02 × 10²³.
4.5 mol × [tex]\frac{6.02 * 10^{23} molecules}{1 mol}[/tex] = 2.71 × 10²⁴ molecules.
There are 2.71 × 10²⁴ molecules in 4.5 moles of Ca(OH).
Which of the definitions below is best for the word molecule? Atoms of different elements chemically joined together More than one atom chemically joined together A type of compound More than one atom of the same type chemically joined together A group of atoms together
Answer: More than one atom of the same type chemically joined together
Explanation:
An atom is the smallest unit of any matter which may or may not have independent existence. Example: Argon (Ar) is an element which exist as Ar atom only.
Molecule is the smallest unit of any matter which always have independent existence. For example: Hydrogen (H) is an element which can exist in nature as [tex]H_2[/tex] molecule only.
Atoms of different elements chemically joined together is called as a compound. Example: [tex]H_2O[/tex] is a compound formed by chemical combination of hydrogen (H) and oxygen (O) atom.
Identify two reasons why the relative size of an atom become smaller due to the loss of electrons .
Answer:
nucleus as electrons are being added to the same principal energy level. These electrons are gradually pulled closer to the nucleus because of its increased positive charge. Since the force of attraction between nuclei and electrons increases, the size of the atoms decreases.
Explanation:
Nuclear attractive pull to the electrons results in smaller atomic radius. Two reasons that leads the size of an atom smaller by electron loss are nuclear pulling and emptying outermost orbital.
Why atomic radius reduces by electron loss?
The nucleus have a net positive charge and electrons are negative in charge, thus, each electron experience a nuclear attractive pull. However, each electrons are shielded slightly from this attraction by the surrounding electrons.
The reasons which make the atomic radius smaller are the following.
By losing electrons the total number of electron is reducing therefore, the screening or shielding of an electron by other electron from the nuclear attractive pulling reduces, and thus due to the nuclear attraction, the orbitals shrinks inwards and reduces the atomic size. By losing electron from the outermost orbital if it contains only one electron then the orbital becomes empty and the atomic radius shrinks to the penultimate shell or orbital.
Therefore, due the two reasons mentioned above, the atomic radius reduces by electron loss.
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molecules of solid ice cannot
Anything that has mass and takes up space is ____
A. Solid
B. Matter
C. Gas
D. Liquid
Answer:
d
Explanation:
(d) Liquid O2 conforms to the shape of its container but has a fixed volume; it contains relatively densely packed molecules. (c) Gaseous O2 fills ...
Missing: ice | Must include: ice
what volume of water has a mass of 1 kg
Answer:
[tex]V=0.001\ m^3[/tex]
Explanation:
Mass, m = 1 kg
The density of water, d = 1000 kg/m³
We need to find the volume of water. The formula for the density of an object is equal to mass divided by volume. Its formula is :
d = m/V
V is the volume of water
[tex]V=\dfrac{m}{d}\\\\V=\dfrac{1\ kg}{1000\ kg/m^3}\\\\=0.001\ m^3[/tex]
So, the volume of water is [tex]0.001\ m^3[/tex].
Answer:
Volume of water has a mass of 1 kg is explained below in details.
Explanation:
One liter of h2O has a volume of approximately specifically one kilogram when estimated at its maximum frequency, which happens at about 4 °C. It observes, therefore, that thousand of a liter, recognized as one milliliter (1 mL), of h2O has a volume of about 1 g; 1000 liters of h2O has a volume of about 1000 kg (1 tonne).
convert 80kg into grams
Answer:
80000 grams
Explanation:
kilo means 1000
80 x 1000 = 80, 000
How many kilograms is 0.22 lb?
O A. 0.22 kg
O B. 0.454 kg
C. 0.0998 kg
O D. 0.49 kg
Answer:
C)0.0998kg
explanation:
1 POUND=0.453592...kg
What is the first stroke of a 4 stroke cycle?
A. intake
B. exhaust
C. compression
D. power
Answer:
Intake
Explanation:
It is the very first thing you do.
Figure 4: Four-Stroke Cycle In the first stroke, also known as the Intake Stroke or Induction, the piston travels from the top dead centre (TDC) to the bottom dead centre (BDC) with the intake valve open and exhaust valve closed. This creates a vacuum due to the increase in volume in the combustion chamber.
The stroke cycle is used in the operating cycle of gasoline or petroleum engines. The first stroke in the 4 stroke cycle is intake. Hence, option A is correct.
What is stroke cycle ?An internal combustion (IC) engine is referred to as having four strokes when the piston is rotating the crankshaft. A stroke refers to the whole journey of the piston along the cylinder, in either direction.
In gasoline/petrol engines, a four-stroke cycle is used. The four strokes are intake (1), compression (2), power (3), and exhaust (4). The intake port is on the right's blue side, and the exhaust port is on the left's brown side.
The piston head is surrounded by a thin sleeve called the cylinder wall, which provides a space for the combustion of fuel and the production of mechanical energy. Therefore, the first stroke of a 4 stroke cycle is intake.
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NEED HELP PLSSSS THANK UU
Answer: rotation
Explanation:
orbitttttttttttt
Explanation:
can yall help me wit this?
Answer:
the color change
Need help. Is this correct
Answer:
Yes, that is correct!
Explanation:
Answer:
Yes
Explanation:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
