A first order reaction has a rate constant of 0.00318 min^-1. The half-life of this reaction is therefore 94.7 min
the lens of the eye is clear so that light can go through.
A. True
B. False
Answer:
true
Explanation:
the clear lens over the eye is called the cornea
Sugar is made of carbon , hydrogen, and oxygen atoms. sugar is ?
Answer:
The white stuff we know as sugar is sucrose, a molecule composed of 12 atoms of carbon, 22 atoms of hydrogen, and 11 atoms of oxygen (C12H22O11). Like all compounds made from these three elements, sugar is a carbohydrate.
Explanation:
I need help please <33
Answer:
Option 3 is correct.
The atomic nucleus of each element has a unique number of protons. Therefore, the energy of the electron layers of the atoms of each element is unique.
If we have the energy released from each electron transfer between the layers of the atom, we can identify the element.
What occurs in photosynthesis reaction
Answer and Explanation:
Photosynthesis reaction involves two reactants, carbon dioxide and water. These two reactants yield two products, namely, oxygen and glucose.
What is the concentration of a 500 mL solution with 25 mol of HF? Write your answer with TWO decimal places and round accordingly. ______M
Answer:
23
Explanation:
The concentration of the solution is given as the ratio of the moles and the volume of the solution. The concentration of hydrogen fluoride is 50 M.
What is molarity?Molarity is the colligative property that is expressed in the terms of the moles of the solute expressed per liter of solution. It is given by the formula:
[tex]\rm Molarity = \rm \dfrac{\text{moles of solute}}{ \text{liters of solution}}[/tex]
Given,
Volume of solution (V) = 0.5 L
Moles of the solute (n) = 25 moles
Molar concentration (M) = ?
Substituting values in the equation we get:
[tex]\begin{aligned} \rm M &= \rm \dfrac{n}{V}\\\\&= \dfrac{25}{0.5}\\\\&= 50\end{aligned}[/tex]
Therefore, 50 M is the concentration of 25 mol Hydrogen fluoride.
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What are the similarities and differences between polyatomic ions and monoatomic ions?
Answer:
similarities: they both carry a charge
differences:
polyatomic ion- composed of more than one atom
monatomic ion- composed in a single atom.
A 45 ml sample of nitrogen gas is cooled from 135 degrees celsius to 15 degrees Celsius in a container that can contract or expand at constant pressure. What is the new volume of nitrogen gas?
Answer:
32 mL
Explanation:
To answer this question we'll use Charles' law, which relates the temperature and volume of a gas at constant pressure:
V₁T₂=V₂T₁
Now we convert the given temperatures to K:
T₁ = 135 °C ⇒ 135 + 273.16 = 408.16 KT₂ = 15 °C ⇒ 15 + 273.16 = 288.16 KAnd given that V₁ = 45 mL, we can input the data:
45 mL * 288.16 K = V₂ * 408.16 KAnd solve for V₂:
V₂ = 32 mLDefinition of specific heat
Answer and Explanation:
Heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree).
Answer:
the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree)
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2, 3-diethyl–4-octene what is structure of this pls help
Answer:
(CH2CH3).
!
CH-CH-CH-CH=CH-CH2-CH2-CH3
!
(CH2CH3)
2, 3-diethyl–4-octene
i am not sure.
What is the electron configuration for
beryllium (atomic number = 4)?
А
B
1s22s
2.
2s22p
2
Answer:
1s22s2
Explanation:
Heat flows from hotter objects to colder objects until it reaches a state where heat is no longer flowing. What have the objects reached when heat is no longer
flowing?
Answer:
It has reaced thermal equlibrum
iron (II) chloride + chlorine gas
iron (III) chloride
Answer:
Fe2Cl + Chlorine
Explanation:
Fe2Cl2
Take your time please.
1. Dependant Variable
2. Scientific Method
3. Data
4. Consistency
5. Metric Balance
6. Mean
7. Technology
8. Dependant Variable
9. Hypothesis
10. Spring Scale
Explanation:Hello! I hope this helped and please correct me if some are wrong. I did my research and matched them. Have a good one!
(>‿◠)✌Answer:
dependent variablescientific methodDataconsistency metric balancemeantechnologydependent variablehypothesisspring scalehope it is helpful to you
fill in the blanks
the law of conservation of energy states that energy cannot be ______ nor _____.
Answer:
created nor destroyed.
3. An object's kinetic energy remains constant as long as:
A. an object remains the same size and continues to move at the same
speed
B. an object remains the same size
C. an object continues to move at the same speed
D. an object doesn't move
Answer:
A
Explanation:
the kinetic energy also depends on mass so kinetic energy remains constant as mass and speed are constant
Which of would be The acid-base pair that can create NaCL with water?
A)LiCland NaOH
B)HCl and NaOH
C)Cl2 and KaI
D)BaO + KO
Answer:
i
Explanation:
Answer:1
Explanation:v
In a circuit that has a total current of 4 amps with 4 lightbulbs wired in parallel, what is the current at each bulb?
Answer: 1 A for each lamps
Explanation: we assume lamps are similar and lamps have same resistance.
Then current is divided according Kirchhoff s law equally to all lamps.
g the following statements as they apply to gas chromatography. Decide if each is true or false. The technique referred to as gas chromatography is actually gas-liquid chromatography since the stationary phase is a liquid adsorbed on the surface of an inert solid. To be separated using GC, analytes must be volatile. An air peak is commonly used to determine the dead time when using a TCD detector. An FID is insensitive to non-combustible gases such as water and carbon dioxide. A column temperature equal to or slightly above the average boiling point of the sample components results in a reasonable elution time.
Answer: To be separated using GC, analytes must be volatile.
An air peak is commonly used to determine the dead time when using a TCD detector.
An FID is insensitive to non-combustible gases such as water and carbon dioxide.
A column temperature equal to or slightly above the average boiling point of the sample components results in a reasonable elution time.
Explanation:
The gas chromatography works on the principle of separation of gaseous substances based on the differences of vapor pressure. The thermal conductivity detector works on the principle of detection of effluents from the has chamber and the air peak gives indication of the retention time of the effluents. Flame ionization detector can be used for the detection of organic compounds but insensitive for the detection of halogens, non-combustible substances like carbon dioxide and water. The temperature of the column is kept higher than the average boiling point of the substance so as to attain separation of substances by the differences in the elution time.
Which element's properties form the basis for all life?
Answer:
carbon
Explanation:
The properties of carbon forms the basis for all life. Explanation: The atoms of carbon are found in the molecules of all living species.
Is this statement true or false?
All gymnosperms lose their leaves in the winter.
Answer:
they do fall off of themselves
Answer:
True!
Explanation:
They usually fall off in the winter
What are the spectators ions in this reaction?
Answer:
Option C. Na⁺(aq) and Cl¯(aq)
Explanation:
From the question given above, we obtained the following:
Na₂SO₄(aq) + CaCl₂(aq) —> CaSO₄(s) + 2NaCl(aq)
Ionic Equation:
2Na⁺(aq) + SO₄²¯(aq) + Ca²⁺(aq) + 2Cl¯(aq) —> CaSO₄(s) + 2Na⁺(aq) + 2Cl¯(aq)
From the ionic equation above, we can see that Na⁺(aq) and Cl¯(aq) are present on both side of the equation.
Therefore, Na⁺(aq) and Cl¯(aq) are the spectator ions because they did not participate directly in the reaction.
Sound waves cannot pass through one another.
A. True
B. False
In a 250.0 g sample of ammonium sulfate, how many moles of ammonium ions are present?
Answer:
1.89 mol
Explanation:
in 250 g of ammonium sulfate 1.89 moles are present
What is the concentration of a strong base solution (of an alkali metal) that has a pH of 11.39?
Answer:
[tex][OH^-]=2.455x10^{-3}M[/tex]
Explanation:
Hello there!
In this case, since a strong base produce OH ions in solution, it possible to first compute the pOH as shown below:
[tex]pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-11.39\\\\pOH=2.61[/tex]
Thus, via the definition of the pOH we can compute the concentration of the strong base as follows:
[tex]pOH=-log([OH^-])[/tex]
Thus, solving for the concentration we obtain:
[tex][OH^-]=10^{-pOH}=10^{-2.61}[/tex]
[tex][OH^-]=2.455x10^{-3}M[/tex]
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Draw a line to connect the following terms to their definition.
The close packing of particles in solids results in
Answer:
Close packing in crystals refers to space efficient arrangement of constituent particles in a crystal lattice. To understand this packing more clearly we have to assume all particles (atoms, molecules and ions) are of the same spherical solid shape. So the unit cell of a lattice is a cubic shape.
Explanation:
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Question 7 (1 point)
A sample of a gas has a pressure of 0.895 bar when the volume is 318 L. What is the
pressure of the gas when the volume is 125 L?
Answer:
2.28bar
Explanation: Boyle's law P1V1=P2V2 manipulate formula in favor of V2 the new formula should beP1V1/V2
0.895*318/125=2.2768 but to same sigfig it is 2.28
which of the following is the ether- containing analgesic drug (pain fever reducer) that likely contributed to the death of famous aviator howard hughes
Answer:
Happy Birthday HAHAHAHAHAYAHYAHAHAH
Phenacetin is the ether-containing analgesic drug that is likely to contribute to the death of famous aviator Howard Hughes.
What is phenacetin?It is a drug used for relieving pain and reducing fever.
It was taken off the market as a medicine in the 1970s because it was deemed hazardous.
This was the reason for the death of the famous aviator Howard Hughes.
The chemical formula of [tex]\rm C_1_0H_1_3NO_2[/tex].
Thus, the correct option is C, phenacetin.
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Given the unbalanced equation:
_C3H8(g) + _O2(g) -> _H2O(g) + _CO2(g)
When the equation is completely balanced using
smallest whole numbers, the coefficient of O2
Answer:
C3H8 + 502 ----> 3CO2 + 4H20
Explanation:
The twin Keck Observatory telescopes (pictured) are able to detect
electromagnetic waves with a wavelength of 10 meters. Use the following
electromagnetic spectrum to correctly determine the type of wave the
telescopes detect?
A: visible light
B:Microwave
C:Ultraviolet
D: X -Ray
Answer:
From Hawaii’s Maunakea, astronomers around the world use W. M. Keck Observatory to observe the universe with unprecedented power and precision.
The twin Keck Observatory telescopes are the world’s most scientifically productive optical and infrared telescopes. Each telescope weighs 300 tons and operates with nanometer precision. The telescopes’ primary mirrors are 10-meters in diameter and are each composed of 36 hexagonal segments that work in concert as a single piece of reflective glass.
In the middle of the Pacific Ocean, Hawaii Island is surrounded by thousands of miles of thermally stable seas. The 13,796-foot Maunakea summit has no nearby mountain ranges to roil the upper atmosphere. Few city lights pollute Hawaiian night skies, and for most of the year, the atmosphere above Maunakea is clear, calm and dry -— offering the best seeing on Earth.
Answer:
give them brainliest
Explanation: