Answer: The half-life of the compound is 93 minutes
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant =100
a - x = amount left after decay process = (100-36) = 64
a) for completion of 36 % of reaction
[tex]60=\frac{2.303}{k}\log\frac{100}{100-36}[/tex]
[tex]k=\frac{2.303}{60}\log\frac{100}{64}[/tex]
[tex]k=0.0074min^{-1}[/tex]
b) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]t_{\frac{1}{2}}=\frac{0.693}{0.0074min^{-1}}=93min[/tex]
The half-life of the compound is 93 minutes
6. What is a solution an example of?
A) element
B) heterogeneous mixture
(C)compound
D) homogeneous mixture
Answer:
solution is a homogeneous mixture of two or more component
Answer:
B) heterogeneous mixture
Explanation:
What is true about matter?
A. Matter has mass and takes up space.
B. Matter has mass but does not take up space.
O C. Matter takes up space but does not have mass.
O
D. Matter does not have mass or take up space.
Answer:
A
Explanation:
Matter is always anything that can take up space and in order for something you can touch (matter is tangible) It has to have mass.
Which explains why many places on Earth experience four seasons each year rather than just
two?
A As Earth orbits around the Sun, the axis changes its amount of tilt, which causes a change in
the amount of sunlight reaching Earth.
B Eastern and western hemispheres each experience a different season when Earth is at each
position shown and when it is 14 and 34 around its orbit.
C Halfway between the positions shown, the amount of solar energy received is less than when
the axis is pointed toward the Sun, but more than when the axis is pointed away from the
Sun.
D When Earth is 14 and 3/4 around its orbit, the northern hemisphere points directly at the Sun.
Answer:
d is the right one I think
A valley or depression between continents
A. Ocean Ocean basin.
B. Divergent boundary
C. Transform boundary.
D. Convergent boundary
A valley or depression between continents is called Ocean basin. Therefore, the correct option is option A.
What is valley?A valley is indeed a long, low region that commonly runs between mountains or hills and has a river and stream that runs through one end to another. Most valleys are produced through long-term erosion of the ground surface by streams or rivers. Some valleys are produced by glacial ice erosion.
These glaciers may persist in valleys in mountainous areas or in polar regions. These glacially produced valleys could have been constructed or extended during ice periods at lower latitudes or elevations, but they are currently ice-free and populated by rivers or streams. A valley or depression between continents is called Ocean basin.
Therefore, the correct option is option A.
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Calculate ΔGo if the equilibrium constant is 1.37 x 10-5
Explanation:
your answer willing be 8.7
Which example is NOT a chemical change? *
A. Hydrogen peroxide bubbles in an open wound on your skin.
B. Piece of pizza digested when eaten.
C. Rotting Easter eggs. .
D. Dissolving salt in water.
Answer:
The answer would be D as no chemical change is occuring.
Explanation:
Answer:
D. Dissolving salt in water.
Explanation:
No chemical change is actually occurring when salt is added to water
What does the image represent?
Answer:
ether
Explanation:
Write the chemical formula for the following structure. You can't write subscripts so just
do full size subscript numbers.
Answer:
H2O2
Explanation:
By numbering the atoms we know about that it’s Hydrogen Peroxide
13. What is the meaning of the word faint?
please can someone describe this picture? helppp
Answer:
They are in a periodic table
Answer:
it is in periodic manner
Explanation:
I hope it will helps you
Which statement describes an interaction between the biosphere and the atmosphere that is related to
photosynthesis?
• During photosynthesis, plant roots take in water from soil.
O During photosynthesis, plants take in carbon dioxide from the air.
O Through photosynthesis, energy stored in plants is released into the air.
O Through photosynthesis, energy stored in plants is transferred to humans who eat them
Answer:
O During photosynthesis, plants take in carbon dioxide from the air.
Answer: The answer is: During photosynthesis, plants take in carbon dioxide from the air.
Explanation: I have my ways ;>
A tree leaf appears to be green. Which statement explains why the leaf isn't a
blackbody radiator?
A. The leaf reflects light and does not emit it.
B. The leaf does not change temperature when it reflects light.
C. The leaf emits light but does not reflect it.
D. The leaf emits only blue and yellow light.
Answer: A- Like the comments in the other one,the answer is A.
Explanation: Leaves don't emit visible light.
The statement that explains why the leaf isn't a blackbody radiator is the leaf reflects light and does not omit it. The correct option is A.
What is a blackbody radiator?A blackbody radiator is an object that absorbs all the electromagnetic radiation, of any wavelength and coming from any direction. This object does not emit any light to it. According to law, the good absorber is one who is also a good emitter.
The tree leaf is not a blackbody radiator, because it absorbs only green light and other lights are emitted by it, that's why it appears green. Whereas a blackbody radiator does not emit any amount of light even if the temperature will be increased.
Thus, the correct option is A. The leaf reflects light and does not omit it.
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what is the pH of pure water?
7 if not exposed to the environment
Answer:
(H20) is 7 at 25oC,
Explanation: hope this helps but when exposed to the carbon dioxide in the atmosphere this equilibrium results in a pH of approximately 5.2.
How many moles are in 74.8 grams of NaCl?
Answer:
1.28 mol NaCl
Explanation:
Find the mass of NaCl by adding the two elements atomic mass
Na: 22.99
Cl: 35.45
22.99+35.45=58.44 g
Now convert to moles
74.8 g / 58.44 g = 1.27994524298 mol
The bear population in a national forest was monitored for ten years. The collected data for two winter months can be seen in the bar graph. Which statement would be a researcher observation from the data collected during the ten years?
Answer:
C. is the answer i did the test and it was right.
Answer:
is D
Explanation:
largest bear population Feb 2000
In a chemical reaction, if one knows the mass of A, one could determine:
1) the mass of any other reactant and product
2) only the mass of B
3) only the mass of C
4) only the mass of A
If one knows the mass of A, they may calculate the mass of any other reactant and product in a chemical reaction.
How can the mass relationship in a chemical reaction be determined?Find out how many moles each reactant has. To identify which reactant is limiting, compare the mole ratios of the reactants with the ratio in the balanced chemical equation. Determine how many moles of the limiting reactant can be converted into the product.
When the mass of the limiting reactant is known, how does one calculate the mass of the product?Calculate the maximum number of moles of product that can be produced from the limiting reactant using mole ratios. Add the product's molar mass to the number of moles.
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How many moles are in 5.34 x 10*21 particles of Nitrogen?
PLEEAASSEE HELP ITS ALREADY WAY PAST DUE AND ILL GIVE BRAINLIEST
Which of the following would be the evidence of a physical change?
A. unexpected change in odor
B. change in state of matter
C. formation of bubbles
D.precipitate was formed
Answer:
A. unexpected change in odor
Explanation: Common physical changes include melting, change of size, volume, color, density, and crystal form. Example the classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change.
Calculate the number of grams of 3.24 x 10^22molecules of CH3(CH2)8(OH)2
8.68 g CH₃(CH₂)₈(OH)₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
3.24 × 10²² molecules CH₃(CH₂)₈(OH)₂
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of C - 12.01 g/mol
[PT] Molar Mass of H - 1.01 g/mol
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of CH₃(CH₂)₈(OH)₂ - 12.01 + 3(1.01) + 8[12.01 + 2(1.01)] + 2[16.00 + 1.01] = 161.3 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 3.24 \cdot 10^{22} \ molecules \ CH_3(CH_2)_8(OH)_2(\frac{1 \ mol \ CH_3(CH_2)_8(OH)_2}{6.022 \cdot 10^{23} \ molecules \ CH_3(CH_2)_8(OH)_2}) \cdot (\frac{161.3 \ g \ CH_3(CH_2)_8(OH)_2}{1 \ mol \ CH_3(CH_2)_8(OH)_2})[/tex]Multiply/Divide: [tex]\displaystyle 8.67838 \ g \ CH_3(CH_2)_8(OH)_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
8.67838 g CH₃(CH₂)₈(OH)₂ ≈ 8.68 g CH₃(CH₂)₈(OH)₂
For the balanced equation shown below, how many moles of Al will react with 98.7 moles of CuSO4
Answer:
65.8 mol
Explanation:
Step 1: Write the balanced equation for the single displacement reaction
2 Al + 3 CuSO₄ → Al₂(SO₄)₃ + 3 Cu
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of Al to CuSO₄ is 2:3.
Step 3: Calculate the number of moles of Al that will react with 98.7 moles of CuSO₄
98.7 mol CuSO₄ × 2 mol Al/3 mol CuSO₄ = 65.8 mol Al
Predict the chemical formula for the ionic compound formed by NH4+ and POsub4exponent3-
2. Which of the following diagrams accurately represents the use of gases in both cellular respiration
and photosynthesis?
CO
CO,
Cellular
respiration
Photosynthesis
Cellular
respiration
Photosynthesis
O
0
a.
c.
CO
Cellular
respiration
Cellular
respiration
Photosynthesis
CO,
(Photosynthesis
0
b.
d.
0
Answer:
In algae or any other photosynthetic organism, there is the internalization of carbon dioxide gas in the reaction with water in the presence of sunlight to produce sugar molecules and oxygen gas in the atmosphere. So, photosynthesis is the process that releases or produces oxygen gas.
In cellular respiration (aerobic) the product of photosynthesis, glucose molecules, and oxygen react to produce the energy and releases carbon dioxide and water as byproducts.
The given question is incomplete, it lacks the diagrams (choices), however, the correct choices are attached as image:
The diagrams accurately represent the use of gases in both cellular respiration and photosynthesis is - diagram d. (check image)
CELLULAR RESPIRATION:
is the process in which living organisms obtain energy (ATP) by breaking down food molecules in their cells. It combines glucose and oxygen to produce carbon dioxide (CO2) and water (H2O) as follows: C6H12O6 + 6O2 = 6CO2 + 6H2OPHOTOSYNTHESIS
is the process in which green plants manufacture their own food using energy from sunlight. It combines carbon dioxide (CO2) and water (H2O) to produce glucose and oxygen (O2) as follows:6CO2 + 6H2O = C6H12O6 + 6O2
Thus, The correct choice of the diagram is - diagram d.
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An athlete can run 4 m/s. How far can she run in 3 minutes?
Answer:
720
Explanation:
4 m/s
60 seconds
= 180 seconds
3 minutes
4 m/s
= 720 m/s
180 seconds
This person is fishing in a small, freshwater body of water. This body of water flows into a larger body of water called a river. What is this small body of freshwater called?
Answer:
Explanation:
The smallest body of water is the brook, a natural stream of water that is found aboveground and is often called a creek as well. A brook is usually a tributary (a small body of water that naturally flows into a large one) of a river, but this is not always the case.
Answer:
pond
Explanation:
I’m stuck on number 2
The definitive difference between speed and velocity is the consideration of _____.
A. variation
B. Direction
C. angles,
Answer: direction
Explanation:
Which of the following elements is a gas at room temperature?
Answer:
hydrogen, nitrogen, oxygen, fluorine, chlorine
What is the difference between a homogenous and a heterogeneous?
Answer:
Explanation:
A homogeneous mixture consists of one single phase while a heterogeneous mixture consists of two or more phases.
what is the characteristics of solid
Answer:
they have there own shape that is not manipulated and they are typically hard
Explanation:
Which of the following is the best example of kinetic energy being transformed into potential energy?
A. water flowing into lake behind a dam
B. an avalanche sliding down a mountainside
C. wind pushing a sailboat through the water
D. a motorboat pulling a water skier across a lake
WHICH ONE IS IT?!
Answer:
The correct answer is A
Explanation:
That water stops moving once it gets to the dam and turns into potential energy