Answer:it would be f
Explanation:
One of the methods that scientists can use to determine the toxicity of a chemical compound is to perform a dose-response analysis.
a. True
b. False
Answer:
a. True
Explanation:
Hello there!
In this case, since the dose-response method is crucial concept in toxicology as it exhibits the result of exposures to toxic chemical compounds with changes in body functions or health, this statement is a. True , as this analysis is understood by means of the relationship -the higher the dose, the more severe the response-, and of course, it is based on observed data from controlled experiments in animal, human clinical, or cell studies, in the light of the determination of the toxicity of the analyzed chemical.
Regards!
Consider 4.70 L of a gas at 365 mmHg and 20. ∘C . If the container is compressed to 2.00 L and the temperature is increased to 36 ∘C , what is the new pressure, P2, inside the container? Assume no change in the amount of gas inside the cylinder.
Answer:
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Explanation:
ASAP PLEAE ANSWER I NEED HELP ITS OVERDUE what’s the definitions?
Answer:
Eclipse: 3. To vanish
Corona: 2. During a solar eclipse, the moon covers the sun, a small ring of fire is visible around the edge
Umbra: 4. The inner, darkest, cone-shaped shadow is
Penumbra: 1. The outer, larger, lighter shadow
Answer:
I found 3. 2. 4. and 1.
Explanation:
I got my answer from this website https://eclipse.aas.org/eclipse-america/eclipse-glossary
explain the effect of the coil of wire after it has been charged by the batteries
how many moles are in 83 particles of sodium chloride?
Answer:
there are 1.4201927800478769 moles in 83 particles of sodium chloride. or 1.42 for short.
Explanation:
What heats up faster but loses heat faster?
-Water
-Air
Or
Land
Bonds are formed because atoms are more stable when they have the valence shell in the electron noble gas configuration (full outer valence shell). What is the net charge of either molecular
ionic compounds?
o
А
Positive
B
Negative
O &
D
Zero-neutral
How many atoms are in a ring made of pure gold, Au (element 79), if there are 0.092 moles of gold in it?
Answer:
i think it wil be 567489
Explanation:
ik im right :)
Which statement can be made about the above passage
Answer:
Explanation:
whats the qustion?
Potassium chlorate decomposes to produce potassium chloride and oxygen gas according to the balanced equation below. If 1.00 g of potassium chlorate decomposes, and 0.500 g of solid potassium chloride is collected, what is the theoretical yield of potassium chloride and the % Yield of potassium chloride
Answer: The theoretical yield of potassium chloride is 0.596 grams and the % Yield of potassium chloride is 83.9%
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} KClO_3=\frac{1.00g}{122.5g/mol}=0.008moles[/tex]
[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
According to stoichiometry :
2 moles of [tex]KClO_3[/tex] produce= 2 moles of [tex]KCl[/tex]
Thus 0.008 moles of [tex]KClO_3[/tex] will produce=[tex]\frac{2}{2}\times 0.008=0.008moles[/tex] of [tex]KCl[/tex]
Theoretical yield of [tex]KCl=moles\times {\text {Molar mass}}=0.008moles\times 74.5g/mol=0.596g[/tex]
% yield = [tex]\frac{\text {Actual yield}}{\text {Theoretical yield}}\times 100=\frac{0.500g}{0.596g}\times 100\%=83.9\%[/tex]
The theoretical yield of potassium chloride is 0.596 grams and the % Yield of potassium chloride is 83.9%
Write
a word equation for the reaction in which hydrogen and oxygen react to form water
Hydrogen + Oxygen → Water.
Suggest two observations that would be made when rubidium is added to cold water.
Answer:
1. Rubidium metal reacts very rapidly with water to form a colorless basic solution of rubidium hydroxide (RbOH) and hydrogen gas (H2).
2. Rubidium sinks because it is less dense than water. It reacts violently and immediately, with everything leaving the container. Rubidium hydroxide solution and hydrogen are formed.
What evidence can be used to explain the type of mutualistic relationship present between the water buffalo and frog?
the exact position of the electrons of an atom cannot be determined because they are in constant ___
help out here plzzzzzzzzzzzzz
Answer:
Chromosomes are duplicated in the "s phase" of interphase.
Which of the following statements are true?
Question 1 options:
According to collision theory, any factor that can cause more collisions will increase the rate of reactions.
According to collision theory, factors can cause more collisions, but will not change the rate of reactions.
According to collision theory, factors that can cause more collisions have less energies than the activation energy, thus will decrease the rate of reaction.
According to the collision theory, no factors can influence reaction rates.
Answer:
c
Explanation:
factor can cause more collision and increase the rate of reaction
Structure of benzylidene diacetate....
Explanation:
Benzal .....
Molecular Formula: C11H12O4
in which location are there no changes in season
a north pole
B South Pole
C equator
D antártica
Answer: I'm going to say it's Antartica because the only seasons it have is summer and winter and it doesn't change.
Explanation:
Please please help me please please
Answer: 1. A, 2.B, 3. D, 4. B, 5. C
Explanation:
i have P.E. too lol have a great day!
During a lab experiment performed at STP conditions, you prepare HCl by reacting 100. ml of Cl2 gas with an excess of H2 gas.
How many ml of a solution of Ba(OH)2 0.230M do you need to neutralize all the HCl produced?
Answer:
19.4 mL Ba(OH)2
Explanation:
H2(g) + Cl2(g) --> 2HCl(aq) (make sure this equation is balanced first)
At STP, 1 mol gas = 22.4 L gas. Use this conversion factor to convert the 100. mL of Cl2 to moles.
0.100 L Cl2 • (1 mol / 22.4 L) = 0.00446 mol Cl2
Use the mole ratio of 2 mol HCl for every 1 mol Cl2 to find moles of HCl produced.
0.00446 mol Cl2 • (2 mol HCl / 1 mol Cl2) = 0.00892 mol HCl
HCl is a strong acid and Ba(OH)2 is a strong base so both will completely ionize to release H+ and OH- respectively. You need 0.00892 mol OH- to neutralize all of the HCl. Note that one mole of Ba(OH)2 contains 2 moles of OH-.
0.00892 mol OH- • (1 mol Ba(OH)2 / 2 mol OH-) • (1 L Ba(OH)2 / 0.230 M Ba(OH)2) = 0.0194 L = 19.4 mL Ba(OH)2
The first step in answering this reaction is to write down the required reaction equations and then answer the questions from stoichiometry(mass-mole relationship).
The first equation is;
[tex]H2(g) + Cl2(g) ------->2HCl(g)[/tex]
The second equation is
[tex]2HCl(g) + Ba(OH)2(aq) -------> BaCl2(aq) + 2H2O(l)[/tex]
From stoichiometry;
1ml = 1cm3
Since hydrogen is in excess, chlorine is the limiting reactant
1 mole of Cl2 occupies 22400cm3
x moles of Cl2 occupies 100cm3
x = 1 * 100/22400
x = 0.00446 moles of Cl2
According to the reaction equation;
1 mole of Cl2 yields 2 moles of HCl
0.00446 moles of Cl2 yields 0.00446 * 2/1
= 0.00892 moles of HCl
From the reaction equation;
2 moles of HCl reacts with 1 mole of Ba(OH)2
0.00892 moles of HCl reacts with 0.00892 * 1/2 = 0.00446 moles of Ba(OH)2
Since 0.00446 moles of Ba(OH)2 reacted
number of moles = concentration * volume
number of moles = 0.00446 moles
concentration = 0.230M
Let the volume in ml be V
0.00446 = 0.230 * V/1000
V = 0.00446 * 1000/ 0.230
V = 19.39 ml
Volume in ml = 19.39 ml of Ba(OH)2
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which has a higher ionization energy magnesium or calcium?
Answer:
magnesium has a higher ionization energy because its radius is smaller. calcium has a higher ionization energy because it outermost sub-energy level is full. they have the same ionization energy because they have the same number of valence electrons.
Explanation:
hope this helps
A 16.4 g sample of calcium chloride is dissolved in enough water to make 750.0 mL of solution. Calculate the molarity of calcium chloride in this solution. plz help!!!
The molarity is an important method to calculate the concentration of a solution. The molarity of calcium chloride of 16.4 g in 750.0 mL of solution is 0.196 mol L⁻¹.
What is molarity?The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is mainly employed in calculating the molarity of a binary solution. It is represented as 'M' and unit is mol L⁻¹.
The equation used to calculate the molarity is given as:
Molarity = Number of moles of the solute / Volume of the solution in litres
Molar mass of CaCl₂ = 110.98 g/mol
Given mass = 16.4 g
Number of moles = 16.4 / 110.98 = 0.147
750.0 mL = 0.75 L
Molarity = 0.147 / 0.75 = 0.196 mol L⁻¹
Thus the molarity is 0.196 mol L⁻¹.
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A chemist mixed two substances together: a blue powder with no smell and a colorless liquid with a strong smell. Their repeating groups of atoms are shown above on the left. After they were mixed, the chemist analyzed the results and found two substances. One ending substance had the repeating group of atoms shown above on the right. Is the ending substance the same substance as the blue powder? What happened to the atoms of the starting substances when the ending substances formed? Be sure to explain your answers to both of these questions.
Answer:
fouse the fact sheet it helps more
PLS HELP AND ANSWER QUICK PLZ HELP
Answer:
i tried
Explanation:
1-A divergent boundary occurs when two tectonic plates move away from each other
2-A transform plate boundary occurs when two plates slide past each other
3-A convergent boundary is when two plates come together
4- I don't know
4NH3 + 502 --> 4NO + 6H20
How much excess reactant is leftover after if 6.30g of ammonia react with
1.80g of oxygen?
Answer:
5.52 g
Explanation:
4NH₃ + 5O₂ → 4NO + 6H₂OFirst we convert the given masses of both reactants into moles, using their respective molar masses:
6.30 g NH₃ ÷ 17 g/mol = 0.370 mol NH₃ 1.80 g O₂ ÷ 32 g/mol = 0.056 mol O₂Now we calculate with how many NH₃ moles would 0.056 O₂ moles react, using the stoichiometric coefficients:
0.056 mol O₂ * [tex]\frac{4molNH_3}{5molO_2}[/tex] = 0.045 mol NH₃As there more NH₃ moles than required, NH₃ is the excess reactant.
Then we calculate how many NH₃ moles remained without reacting:
0.370 mol NH₃ - 0.045 mol NH₃ = 0.325 mol NH₃Finally we convert NH₃ moles into grams:
0.325 mol NH₃ * 17 g/mol = 5.52 gneed this ASAP
Which of these must be FALSE, in order for evolution by natural selection to occur?
A. Variation between individuals exists in a population.
B. Particular variations of traits are passed on from one generation to the next.
C. Resources are limited, leading to competition within the population.
D. The particular traits present in one generation have no effect on traits in the next generation.
thank you :D
what is the pH level of soda?
Physical chemistry is the bridge between physics and chemistry.
a. True
b. False
Answer:
Im gonna go with.... B. False
________________________________
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Yes it is true. That physical chemistry is a bridge between physics and chemistry. Because here we study the physical behaviours of the chemical reactions.
46.0 mL sample of gas at 28.0°C and 748 torr. What volume would this gas
sample occupy at stp?
Answer:
2
Explanation:
what is the molar mass of aspartic acid
The molar mass of aspartic acid is 133.05g/mol.
What is molar mass?The molar mass is the mass per unit amount of substance of a given chemical entity. It is denoted by a symbol M. The SI unit of molar mass is kg/mol.
What is aspartic acid?Aspartic acid is one of the building-block of amino acids which is responsible for synthesizing proteins and regulating hormones in the human body.
The chemical formula of aspartic acid is C4H7NO4.
Atomic mass of C = 12.011u, H = 1.007u, N = 14.006u, O = 16u
Molar mass of C4H7NO4 = 4(12.011)+7(1)+14.006+4(16)
= 48.044+7+14.006+64
= 133.05g/mol
Hence, the molar mass of aspartic acid is 133.05g/mol.
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