Answer:
True (see detailed explanation).
Explanation:
Hello!
In this case, since insecticides are substances that keep crops from insects that can eat or damage them, it has been acknowledged they are important for the agricultural industry and therefore the citizens sustainability.
However, since insecticides have really complex chemical structures, they are unlikely or sluggishly decomposed by the humans and other animals' cells, which can lead to irreversible genetic damage, cancer and other serious diseases; therefore, when they are used incorrectly, say higher amounts than necessary, spread on crops that are not significantly affected by insects or by any other reason, they are very likely to be damaging for us, animals and in general the environment.
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A calorie is a unit of measurement that measures what?
Answer:
Okay
Explanation:
Where are each located? How does each contribute to the formation of the atom (think balance)?
Answer:
Where are what located no picks no pdf so what?
If 2.00 moles of H₂ and 1.55 moles of O₂ react how many moles of H₂O can be produced in the reaction below?
2 H₂(g) + O₂(g) → 2 H₂O(g)
Answer:
2 mol H₂O
Explanation:
With the reaction,
2H₂(g) + O₂(g) → 2 H₂O(g)1.55 moles of O₂ would react completely with ( 2*1.55 ) 3.1 moles of H₂. There are not as many moles of H₂, thus H₂ is the limiting reactant.
Now we calculate the moles of H₂O produced, starting from the moles of limiting reactant:
2.00 mol H₂ * [tex]\frac{2molH_2O}{2mol H_2}[/tex] = 2 mol H₂OThe number of moles of H₂O that could be produced in the reaction is 2.00 moles
From the question,
We are to determine the number of moles of H₂O that could be produced.
The given balanced chemical equation is
2 H₂(g) + O₂(g) → 2 H₂O(g)
This means,
2 moles of H₂(g) reacts with 1 mole of O₂(g) to produce 2 moles of H₂O
From the given information
Number of moles of H₂ present = 2.00 moles
and
Number of moles of O₂ present = 1.55 moles
Since,
2 moles of H₂(g) reacts with 1 mole of O₂(g) to produce 2 moles of H₂O
Then,
The 2.00 moles of H₂(g) will react with 1.00 mole of O₂(g) to produce 2.00 moles of H₂O
∴ 2.00 moles of H₂O will be produced during the reaction
(NOTE: Only 1.00 mole of the O₂(g) will react, meaning O₂(g) is the excess reactant)
Hence, the number of moles of H₂O that could be produced in the reaction is 2.00 moles
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If the concentration of a reactant is tripled (all other things remain constant), and the reaction rate increases nine times, what is the reaction order with respect to the tripled reactant? Enter your answer as a number.If the concentration of a reactant is increased 1.5 times (all other things remain constant), and the reaction rate increases 2.25 times, what is the reaction order with respect to the reactant? Enter your answer as a number.If the concentration of a reactant is tripled (all other things remain constant), and the reaction rate remains constant, what is the reaction order with respect to the tripled reactant? Enter your answer as a number.When 29.0 mL of 0.220 M KIO3 is combined with 38.0 mL of H2SO3 and 50.0 mL of water, what is the resulting concentration of KIO3?
The reaction order for the following conditions are:
a. two
b. two
What do you mean by reaction order?Reaction order is the number of reactants, whose concentration affects the reaction rate.
The reaction order can be determined by adding the exponents of each reactant.
The rate equation is [tex]v^0 = k[A]^x + k[B]^y[/tex]
The first-order reaction is in which the reaction is dependent on one variable concentration.
The second-order reaction is that in which the reaction is dependent upon the concentration of two variables.
Thus, the correct options are a. two, b.two.
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How much water must be added to 424 mL of 0.189 M HCl to produce a 0.140 M solution?
Answer:
Volume of water added = 148.4 mL
Explanation:
Given data:
Initial volume = 424 mL
Initial molarity = 0.189 M
Final molarity = 0.140 M
Volume of water added = ?
Solution:
Formula:
M₁V₁ = M₂V₂
0.189 M×424 mL = 0.140 M×V₂
V₂ = 0.189 M×424 mL /0.140 M
V₂ = 80.136 M.mL / 0.140 M
V₂ = 572.4 mL
Final volume of solution is 572.4 mL.
Volume of water added = Final volume - initial volume
Volume of water added = 572.4 mL - 424 mL
Volume of water added = 148.4 mL
Explain how astronomers use spectrographs to identify the composition of a star.
Spectrographs are useful to astronomers as they help in studying the composition of a star as each component absorbs light at specific wavelengths.
What are spectrographs?It is defined as a graph which depicts the spectral information about the component. Spectrographs consisting of lines are called atomic spectra as the lines represent wavelengths which are radiated from atoms when electrons jump or make a transition from one energy level to another.
Band spectra is given to a group of lines spectrum which are so close that they appear like a band . They are produced by molecules when they radiate their vibrational or rotational energies.
Amount of light which is absorbed is unique for each element and hence astronomers can measure the position of lines to determine which elements are present in the target.
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A crow flies 100 meters east in 5 minutes. What is the crow’s velocity?
Answer: 20 m/min east
Explanation: The speed is distance divided by time
distance between start-point and end-point = 100 meters
time to cover the distance = 5 minutes
100 m ÷ 5 min = 20 m/min east
you have to add east since velocity is the measure of speed and direction and your answer needs to include the direction
if someone takes a breath and the lungs expand from 4.5 L to 5.6 L in volume, and the intial pressure inside the lungs is 756mm Hg,what was the pressure inside the lungs before any additional air is pulled in
Answer:
P₂ = 607 mmHg
Explanation:
Given data:
Initial volume = 4.5 L
Final volume = 5.6 L
Initial pressure = 756 mmHg
Final pressure = ?
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
756 mmHg × 4.5 L = P₂ × 5.6 L
P₂ = 3402 mmHg. L/5.6 L
P₂ = 607 mmHg
Calcium sulfide has a face-centered cubic unit cell with calcium ions in octahedral holes and sulfide ions at the lattice points. How many ions of each element are contained in each unit cell
Answer:
4 calcium ions and 4 sulfide ions.
Explanation:
In a face centered unit cell, 8 corners of the unit cell are occupied by 8 atoms. Each corner is 1/8 of a cell. In addition it has 6 atoms in the face of the lattice, which is 1/2 of a cell. (1/8 * 8) + (1/2 * 6) = 4. CaS has a 1:1 ratio. Therefore, they each have 4 ions.
Each cubic unit cell contains FOUR (4) calcium ions in octahedral holes and FOUR (4) sulfide ions at the lattice points.
Calcium sulfide is a solid inorganic compound (chemical formula: CaS) that shows a white appearance and crystallizes in cubes like rock salts. This molecule (calcium sulfide) is widely used to produce certain classes of paints, ceramics, paper, etc.Calcium has a valence of 2 electrons, while sulfur has '6' valence electrons, thereby the number of valence electrons in CaS is equal to 2 + 6 = 8.Calcium sulfide (CaS) adopts a sodium chloride crystal structure where each CaS unit cell contains four sulfide (S²⁻) ions and four calcium (Ca²⁻) ions.In conclusion, each cubic unit cell contains FOUR (4) calcium ions in octahedral holes and FOUR (4) sulfide ions at the lattice points.
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Which of these types of changes is a physical change?
A. Changing one substance into another
B. Dissolving one substance in another
C. Breaking apart one substance into two substances
D. Making a new substance
Answer:
answer is c
Explanation: cause there breaking it
A competitive high school swimmer takes 56.7 seconds to swim 100. yards. What is his rate in m/min?
m
min
Answer:
96.72 m/min
Explanation:
The following data were obtained from the question:
Time (t) = 56.7 s
Distance (d) = 100 yard
Rate (R) =?
Next, we shall convert 56.7 s to minutes. This can be obtained as follow:
60 s = 1 min
Therefore,
56.7 s = 56.7 s × 1 min /60 s
56.7 s = 0.945 min
Next, we shall convert 100 yard to metre (m). This can be obtained as follow:
1 yard = 0.914 m
Therefore,
100 yard = 100 yard × 0.914 m /1 yard
100 yard = 91.4 m
Finally, we shall determine the rate of the swimmer as follow:
Time (t) = 0.945 min
Distance (d) = 91.4 m
Rate (R) =?
R = d/t
R = 91.4/0.945
R = 96.72 m/min
Thus the rate of the swimmer is 96.72 m/min
how many sodium ions are in 1.4 kg of sodium chloride, NaCl?
Answer:
1.44 x 10²⁵ ions of Na⁺
Explanation:
Given parameters:
Mass of NaCl = 1.4kg = 1400g
Unknown:
Number of ions of sodium = ?
Solution:
The compound NaCl in ionic form can be written as;
NaCl → Na⁺ + Cl⁻
In 1 mole of NaCl we have 1 mole of sodium ions
Now, let us find the number of moles in NaCl;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Number of moles = [tex]\frac{1400}{58.5}[/tex] = 23.93mol
So;
Since 1 mole of NaCl gives 1 mole of Na⁺
In 23.93 mole of NaCl will give 23.93 mole of Na⁺
1 mole of a substance = 6.02 x 10²³ ions of a substance
23.93 mole of a substance = 6.02 x 10²³ x 23.93
= 1.44 x 10²⁵ ions of Na⁺
The barometric pressure measured outside an airplane at 3 km ( ft) was 524 mmHg. Calculate the pressure in kPa.
Answer:
69.8609 KPa.
Explanation:
The following data were obtained from the question:
Pressure (in mmHg) = 524 mmHg.
Pressure (in KPa) =?
Thus we can obtain the pressure in KPa as follow:
760 mmHg = 101.325 Kpa
Therefore,
524 mmHg = 524 mmHg × 101.325 KPa / 760 mmHg
524 mmHg = 69.8609 KPa
Thus, 524 mmHg is equivalent to 69.8609 KPa.
find the percent yield,if 6.0g of Lithium chloride are actually produced and the theoretical yield is 35.4g of Lithium chloride.
Answer:
Percent yield = 17%
Explanation:
Given data:
Actual yield of lithium chloride = 6.0 g
Theoretical yield of lithium chloride = 35.4 g
Percent yield = ?
Solution:
Formula:
Percent yield = (actual yield / theoretical yield )× 100
Now we will put the values in formula.
Percent yield = (6.0 g/ 35.4 g)× 100
Percent yield = 0.17 × 100
Percent yield = 17%
The pressure of a 5.0 L sample of gas changes from 3.0 atm to 10.0 atm while the temperature remains constant. What is the gas’s new volume?
Answer:
The answer is 1.5 LExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{5 \times 3}{10} = \frac{15}{10} = \frac{3}{5} \\ [/tex]
We have the final answer as
1.5 LHope this helps you
A gas at constant temperature has a pressure of 404.6 kPa with a volume of 12 ml. If the volume changes to 43ml, what is the new pressure
Answer:
The answer is
112.912 kPaExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
404.6 kPa = 404600 Pa
From the question we have
[tex]P_2 = \frac{404600 \times 12}{43} = \frac{4855200}{43} \\ = 112911.6279... \\ = 112912[/tex]
We have the final answer as
112.912 kPaHope this helps you
At the Sparta Fault in Greece, the hanging wall is below the footwall. This type of fault is called a .
Answer:
1 a
Explanation:
Determine the molarity of a solution prepared by dissolving 0.198 g of "KHP" (C8H5O4K) in enough water to make 125 mL of solution.
When the solution is found and titrated with aqueous sodium hydroxide, the endpoint is reached after the addition of 27.80 mL of base solution. How many moles of NaOH reacted? What is the concentration of the NaOH?
Answer:
0.007756M KHP; 0.0009695 moles NaOH reacts; 0.03488M NaOH.
Explanation:
Potassium hydrogen phthalate, KHP, is a salt used as standard to determine concentration of basic solutions as NaOH solutions.
To find molarity of the KHP solution we need to convert mass of KHP to moles and divide this in 125mL = 0.125L:
Moles KHP -Molar mass: 204.22g/mol-:
0.198g * (1mol / 204.22g) = 0.0009695 moles KHP
Molarity:
0.0009695 moles KHP / 0.125L = 0.007756M KHP
NaOH reacts with KHP as follows:
NaOH + KHP → Na⁺ + KP⁻ + H₂O
That means 1 mole of NaOH reacts per mole of KHP, that means moles of NaOH that reacts are = Moles of KHP added:
0.0009695 moles NaOH reacts
In 27.80mL = 0.02780L the NaOH was contained. Molarity is:
0.0009695 moles NaOH / 0.02780L =
0.03488M NaOH
Moles of NaOH added will be "0.034".
According to the question,
→ [tex]Molarity = \frac{Number \ of \ moles}{Volume}[/tex]
By substituting the values, we get
[tex]= \frac{0.198}{204}\times \frac{1000}{125}[/tex]
[tex]= 0.0077 \ M[/tex]
Let,
The number of moles added be "[tex]M_2[/tex]".Now,
→ [tex]M_1 V_1 = M_2 V_2[/tex]
→ [tex]0.0077\times 125=M_2\times 27.8[/tex]
→ [tex]M_2 = 0.034 \ moles[/tex]
Thus the above answer is appropriate.
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Which of the following examples of erosion would occur most quickly?
OA. A river erodes sediment to form a canyon.
ОВ.
A glacier carves out a path as it moves.
OC. A wind storm moves sand from one area to another
OD
Ocean waves erode a large rocky cliff.
Answer: OC
Explanation:
The Others Could Take Many Millions Of Years
is metal and plastic beads magnetism, state of matter, or solubility?
please help!!!!
Phrase to describe ice
Answer:
Here are some adjectives for ice: para-elemental, kinder thin, thick continental, invisibly transparent, dirty, rock-hard, immense and almost innumerable, thin, flawless, horizontal and pelting, nearly horizontal and pelting, more pelting, beautifully numbing, pure compact, new catastrophic, dirty brash, largely foamy, ...
Explanation:
What mass of glucose (C6H12O6) should be dissolved in 12.0 kg of water to obtain a solution with a freezing point of -5.8 ∘C?
Solution properties are the properties of a solution that don't depend on the type of solute but only on the concentration of the solute.
Solutions from volatile substances have a higher boiling point and lower freezing points than the solvent
For freezing point can be formulated
[tex]\tt \Delta T_f=K_f.m[/tex]
K = molal freezing point constant
m = molal solution
A solution with a freezing point of -5.8 ∘C
[tex]\tt \Delta T_f=T_f~solvent-T_f~solution=0-(-5.8)=5.8[/tex]
[tex]\tt mass~of~glucose:\\\\\Delta T_f=K_f.m\\\\5.8=1.86^oC/m.\times \dfrac{mol~glucose}{12}\\\\mol~glucose=\dfrac{5.8\times 12}{1.86}=37.42[/tex]
[tex]\tt mass=mol\times MW=37.42\times 180=6735.6~g=6.7356~kg[/tex]
The diagram shows water in a graduated cylinders. Graduated cylinder B has 30 mL of water.
What is this statement and example of?
(4 Points)
Prediction
A theory
An observation
A hypothesis
which has a higher melting point CH3CH2CH2CH2CH2CH3 or CH3CH2CH2CH2CH2CH2CH2CH3
Answer:
the second one
Explanation:because its higher
Answer:
CH3CH2CH2Ch2Ch2Ch3
Explanation:
That's the answer
1. How many atoms are in 0.25 moles of carbon?
2. How many atoms are in 12.3 grams of sodium?
3. How many grams are there in 0.52 moles of boron?
4. How many grams are there in 2.0 moles of HCl?
5. How many moles are in 3.4 grams of HBr?
6. How many grams are there in 4.5x10^10 atoms of NaCl?
7. How many atoms are there in 45.1 grams of MgO?
Answer 1 mole = 6.02 × 1023 atoms
0.25 moles × (6.02 × 1023) = 1.5 × 1023 atoms Carbon
for the first one
Draw the structures of the starting materials needed to make 2‑methylhept‑3‑yne or 2‑methyl‑3‑heptyne. The starting materials may be any bromoalkane having five carbons or fewer.
Answer:
Explanation:
The structures of the starting materials 2‑methylhept‑3‑yne can be seen in the diagram attached below. We will also notice the role of NaNH₂ which acts as a strong base and whose function is to extract acidic proton and form an alkyne as a product.
The reaction with NaNH₂ yields acetylide ion which is then reacted with a straight-chain alkyl halide to form an extended carbon chain.
CHECK THE DIAGRAM BELOW.
How many atoms of phosphorus are in 5.70 mol of copper(II) phosphate?
Answer:
Cu3 (PO4)2 contains a total of 2 atoms of phosphorus in just one molecule. (2.10 mol)(6.02214 x 10^23 atoms / mol)(2 phosphorous) = 2.53 x 10^24 atoms of phosphorous per molecule of copper i
Explanation:
Cells pump definition
Answer:
Pumps also called transporters, are transmembrane proteins that actively move ions and/or solutes against a concentration or electrochemical gradient across biological membranes.
How many atoms are in 1.4 mol of phosphorus trifluoride (PF3)?
Number of atoms in 1.4 mol of Phosphorus trifluoride (PF₃) : 8.428 x 10²³
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
1.4 mol of Phosphorus trifluoride (PF₃), number of atoms :
[tex]\tt N=1.4\times 6.02\times 10^{23}\\\\N=8.428\times 10^{23}[/tex]
What are the different layers of the earth and how do they interact.
Answer: The crust and the upper layer of the mantle together make up a zone of rigid, brittle rock called the Lithosphere . The layer below the rigid lithosphere is a zone of asphalt-like consistancy called the Asthenosphere . The asthenosphere is the part of the mantle that flows and moves the plates of the Earth.
Explanation: