Answer:
initiated the comprehensive discovery and cataloguing of a 'parts list' of most human genes
Explanation:
How many elements make up Ibuprofen?
C13H18O2
Answer:
Explanation:
wouldn't it be three because every capital is a new element?
hello everyone, i need resources to help for my chemistry test, if you have any free sources for studying: mole conversions, stoichiometry, thermochemistry, reaction types, molar mass, hess' law and chemical equations. That would be nice cuz im studying last minute. Thank you.
Answer:
Yes, there are some free resource like quiz..let quizzes to help guide you through your studying, so if you want just post the questions and I can answer them as well.
Question 22 of 25
What are two benefits of scientists using a diagram to model the water cycle?
I A. Only a few factors in the water cycle can be shown on the
diagram
B. It can show changes that occur in many different parts of Earth at
the same time.
C. It can be used to show as much detail as is present in the actual
water cycle.
D. It can be used to show how the parts of the cycle relate to one
another.
Answer:
D. and B.
Explanation:
I got it right on my quiz
Five important things about Fluorine>
Answer
here hope this helps !
Which one of the following indicators would be best to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl?
When there is 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl, and the pH mathematically given as
pH=4
The indicator is Methyl red
What is best for titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl?Generally, the equation for the Chemical Reaction is mathematically given as
HCl +BOH--->BCl+H20
Therefore
pH=0.5(pkw-pkb-logl)
pH=0.5()14-5.8-logl
pH=4
In conclusion, The best indicator should have pKa =pH
Hence
Methyl red is best
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The best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.
What is an acid-base indicator?An acid-base indicator is a substance which change colour or develop turbidity at a particular pH.
Acid-base indicators are used during acid-base titrations to detect when neutralization has occured.
The indicators to be used when combining acid and base are as follows:
Strong acid-strong base - PhenolphthaleinWeak acid-strong base - PhenolphthaleinStrong acid-weak base - Methyl orangeMorphine is a weak base while hydrochloric acid is a strong acid.
Therefore, the best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.
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Select the statement that correctly describes the connection between two nucleotides:
A phosphodiester bond would form between the phosphate groups of each of the nucleotides..
A phosphodiester bond would form between the base of one nucleotide and the phosphate of the second nucleotide.
A phosphodiester bond would form between the phosphate group of one nucleotide and a hydroxyl group of the second nucleotide.
A phosphodiester bond would form between a purine base of one nucleotide and a hydroxyl group of the second nucleotide.
Answer:
The band that looks like milk in the night sky isn't actually milk,
Explanation:
Which is a trait of a technical text?
A particular tank of oxygen gas contains 785 L at 21°C.If the pressure remains constant,what volume will the gas occupy if the temperature is changed to 28°C? (Write procedure)
What is one way to spearate awater an salt
Answer:You can boil or evaporate the water and the salt will be left behind as a solid. If you want to collect the water, you can use distillation. This works because salt has a much higher boiling point than water.
Explanation:
hope it hepls
14 Water falling from the sky as
rain or sleet is called
A water cycle
B precipitation
C snow
D hail
Pls help
Answer:
b precipitation
Explanation:
When rain or sleet falls, it is concidered precipitation!
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Calculate the molarity of 0.5 moles NaHCO3 in 3,691 of solutions
Answer: 0.135 M
Explanation:
Explain anaerobic respiration with yeast in your own words
Answer:
Is breaking down of food substances in the abscence of Oxygen
The bottom wave has a greater _____
Answer:
frequency because it moves up and down faster.
Explanation:
Answer: current and pull making quicker wave and smaller
Explanation:
Find the weight of sodium hydroxide needed to form a 1M solution of 500 mL.
[tex]\\ \rm\Rrightarrow Molarity=\dfrac{Moles\:of\:solute}{Volume\:of\: solution \:in\:L}[/tex]
[tex]\\ \rm\Rrightarrow 1=\dfrac{n}{0.5}[/tex]
[tex]\\ \rm\Rrightarrow n=0.5mol[/tex]
Molar mass of NaOH=23+16+1=40u[tex]\\ \rm\Rrightarrow n=\dfrac{Given\:mass}{Molar\:mass}[/tex]
[tex]\\ \rm\Rrightarrow 0.5=\dfrac{Given\:mass}{40}[/tex]
[tex]\\ \rm\Rrightarrow Given\:mass=40(0.5)=20g[/tex]
A chemist has 2. 0 mol of methanol (CH3OH). The molar mass of methanol is 32. 0 g/mol. What is the mass, in grams, of the sample? 16 grams 30 grams 32 grams 64 grams.
The mass, in grams, of the sample of methanol (CH₃OH) is 64 grams.
How we calculate mass from moles?Mass of any substance can be calculated by using moles as:
n = W/M, where
W = required mass
M = molar mass
In the question that:
Moles of methanol = 2mole
Molar mass of methanol = 32g/mole
On putting these values in the above equation, we get
W = n × M
W = 2mole × 32g/mole = 64g
Hence, 64 grams is the mass of the sample.
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Which of the following factors is needed during light-dependent reactions to create ATP and NADPH energy molecules?
Oxygen
Solar energy
Carbon dioxide
Water
4. Which is a clastic rock?
A
coal
B.
limestone
U
rock gypsum
D
sandstone
Answer:
B limestone
Explanation:
Which statement best describes the atoms in a gas?
Answer:
They move freely in all directions.
Explanation:
Given the chemical formula, KNO3, the percent nitrogen in the compound
Answer:
16 % is the percentage of nitrogen
What is the oxidation number of oxygen
in N02-?
Nitrogen dioxide (NO2) is a molecule which contain two oxygen atom and one nitrogen atom. Oxidation number of nitrogen atom can be found by two methods, algebra method and observing structure of molecule. Oxidation number of nitrogen is important to decide to whether NO2 can be oxidized or reduced.
A sample originally contains 24 grams of a radioactive isotope. After 18 days, 18.8 grams of the isotope remain in the sample. What is the half-life of the isotope
The sample's decay constant for the given time of radioactive decay is 0.0058 days⁻¹. Thus, the half life of the sample is 119.48 days.
What is radioactive decay?Heavy unstable radioactive nuclei undergo radioactive decay by the emission of charged particles. They stable isotopes or new atoms by radioactive decay.
It is given that the sample of 24 grams decays to 18.8 grams within 18 days. The decay constant k can be calculated as follows:
k = 1/t log (Ci/Ct)
Where Ci is the initial amount and Ct be the final amount.
k = 1/18 log (24 g /18.8 g)
= 0.0058 days⁻¹
Now, the half life time of the sample can be calculated as:
t1/2 = 0.693 / k
= 0.693/0.0058 days⁻¹
= 119.4 days.
Therefore, the half life of the sample is 119.4 days.
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Last night you were watching the news on the television and the weather forecast for today is muggy and hot. The temperature in the house is rising you turn on the air condition unit and made the room temperature lower.
Answer:
The weather from the outside has impact n what goes on inside. Due to it being hot and muggy out, the weather was able to mess with the temperature in the house.
Explanation:
An air condition is used to regulate the temperature of a room by removing heat as well as reducing humidity.
What is temperature?Temperature is the degree of coldness or hotness of an object or a particular place.
The temperature of an area is affected by the climate and the amount of sunshine.
Also due to heating, water vapor rises into the atmosphere resulting in humidity.
An air condition makes a temperature room cooler by removing heat as well as reducing humidity.
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Read the passage.
Water can react with hydrochloric acid (a strong acid) to form hydronium and chlorine ions. In this case, water acts as a base. Water also reacts with ammonia (a strong base) to form ammonium and hydroxide ions. In this case, water acts as an acid.
Which option correctly describes the reason for this phenomenon?
1. Water is a neutral compound. It can act as a base when coupled with a strong acid, or as an acid when coupled with a strong base.
2.Every substance can act as a base or an acid depending on the reaction they partake in. This property of substances is called amphotericity.
3. Water acts as a conjugate acid when coupled with a strong acid, or as a conjugate base when coupled with a strong base.
4. Water is an amphoteric compound. It can act as a base when coupled with a strong acid, or as an acid when coupled with a strong base.
you and a friend each hold one end of a long spring toy and shake it back and forth to make waves. What is the medium fot these waves? A:Your friends hand
B:The air C:The spring D:Your hand
What change was caused by a change in temperature?
Answer:
The temperature of the earth determines how much water there is in our atmosphere. Carbon dioxide is the most commonly discussed of the greenhouse gases. This has occurred primarily because of the huge amounts of carbon dioxide humans are moving from the earth to the atmosphere in the burning of fossil fuels.Explanation:
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If I gave you 3 moles of methane, how many moles of water will be produced?
Answer: 6 moles
Explanation:
What happens to the energy absorbed during an endothermic reaction
Answer:
more energy is absorbed when the bonds in the reactants are broken
The molar mass of hydrogen (H2) is 2. 02 g/mol. A sample contains 4. 00 mol of H2. What is the mass, in grams, of this sample? 1. 98 grams 2. 02 grams 4. 00 grams 8. 08 grams.
Answer:
8.08 G/mol
Explanation:
This is because a mole just equals 1 amount of something. Example, 1 mol of carbon is about 12 AMU. To convert from Mols to Grams, you need to multiply the substance mass by the amount of mols, this case 2.02g/mol by 4.
Hope this helps!
Use the map to identify which body of water (A, B, C, or D) matches bar 3, and explain your answer.
please help me 50 points!
Answer:
AgNO and NaNO + AgCI
Explanation:
Because 10 mol of NaCI is AgNO!
How many grams of sodium chloride are present in 11.00 moles?
331.0 g
4500 g
156.6 g
642.9 g