Answer:
gdfktfnfgh trhdfih tdjgd
Perform the following calculation and report the answer with the correct number of significant figures.
755.684 - 67.71 =
Answer:
687.974 is your answer
Explanation:
What makes up soil???????
Answer:
Soil is a material composed of five ingredients — minerals, soil organic matter, living organisms, gas, and water. Soil minerals are divided into three size classes — clay, silt, and sand (Figure 1); the percentages of particles in these size classes is called soil texture.
Explanation:
Calculate the Gibbs Free-Energy and the standard Gibbs Free-
Energy by the cell in the given cell notation: Zn(s) |Zn2+(aq) || H+(aq)| H2(g) |Pt (s)
When [Zn+2] = 4.0 x 10 -3 M, [H2] = 0.010 M, [H+] = 1.0 M
PLEASE ANSWER THIS ILL GIVE MANY POINTS
[tex]\bull\sf \Delta H=4.0\times 10^{-3}M[/tex]
[tex]\bull\sf T=0.010M[/tex]
[tex]\bull\sf \Delta S=1.0M[/tex]
[tex]\\ \bull\sf\longmapsto \Delta G=\Delta H-T\Delta S[/tex]
[tex]\\ \bull\sf\longmapsto \Delta G=0.004-0.01(1)[/tex]
[tex]\\ \bull\sf\longmapsto \Delta G=0.004-0.01[/tex]
[tex]\\ \bull\sf\longmapsto \Delta G=-0.006J[/tex]
The pKa of formic acid is 3.75. At pH of 5.00, _______ .
a) [formate] < [formic acid]
b) [formate] > [formic acid]
c) Insufficient information to be determined.
d) [formate] = [formic acid]
The pKa of formic acid is 3.75. At pH of 5.00, b) [formate] > [formic acid].
Formic acid is a weak acid. Thus, together with its conjugate base (formate) they form a buffer system. We can calculate the pH of a buffer system using Henderson-Hasselbach's equation.
[tex]pH = pKa + log \frac{[formate]}{[formic\ acid]} \\\\5.00 = 3.75 + log \frac{[formate]}{[formic\ acid]}\\\\\frac{[formate]}{[formic\ acid]} = 17.8[/tex]
As expected, at a pH above the pKa, the concentration of formate is higher than that of the formic acid.
The pKa of formic acid is 3.75. At pH of 5.00, b) [formate] > [formic acid].
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2. How many GRAMS of boron trichloride are present in 2.26*10^22 molecules of this compound?
___ grams.
Answer:
1.17x1024 molecules 2) 0.13 moles
Explanation:
hope this helps
I got tha last one wrong Wha this one ?
Answer:
I think 10.5 or 10.55
Explanation:
Hope this helps :)
Find the initial temperature of 45.0g of water if its final Temperature after submerging a metal with the mass of 8.5g is 22.0°C . The initial temperature of metal before submerging it to water is 82.0°C
The initial temperature of the water that resulted in the final temperature of the water-metal mixture is 20.7 ⁰C.
"Your question is not complete, it seems to be missing the following information;"
the specific heat capacity of the metal is 0.45 J/g⁰C.
The given parameters;
mass of water, [tex]m_w[/tex] = 45 gfinal temperature of the water, [tex]t_w[/tex] = 22 ⁰Cmass of the metal, m = 8.5 ginitial temperature of the metal, t = 82 ⁰C.specific heat capacity of the metal, c = 0.45 J/g⁰C.The initial temperature of the water will be calculated by applying the principle of conservation of energy;
heat gained by water = heat lost by metal
[tex]Q_{water} = Q_{metal}[/tex]
[tex]m_wc_w \Delta t_w = mc\Delta t[/tex]
where;
[tex]c_w[/tex] is the specific heat capacity of the water = 4.184 J/g⁰C.
Substitute the given values;
45 x 4.184 x (22 - t) = 8.5 x 0.45 x (85 - 22)
4142.16 - 188.28t = 240.98
188.28t = 4142.16 - 240.98
188.28t = 3901.18
[tex]t = \frac{3901.18}{188.28} \\\\t = 20.7 \ ^0 C[/tex]
Thus, the initial temperature of the water that resulted in the final temperature of the water-metal mixture is 20.7 ⁰C.
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please someone help me Balance this equation.
K2CrO7 + H2SO4 + 2C2H5OH = 3CH3COOH + 2K2SO4 + 4H2O + 2Cr2(SO4)3.
Answer: This is an oxidation-reduction (redox) reaction:
3 C-II - 12 e- → 3 CII (oxidation)
4 CrVI + 12 e- → 4 CrIII (reduction)
C2H5OH is a reducing agent, K2Cr2O7 is an oxidizing agent.
During oxidation of ethanol to ethanol, the ethanol formed was found to be contaminated with unconverted ethanol, describe how you would obtain ethanal free from ethanol
Answer:
Ethanol is oxidised by acidified sodium dichromate in a test tube reaction, firstly to form ethanal (acetaldehyde), and with further oxidation, ethanoic acid (acetic acid)
Procedure
Place about 3 cm3 of acidified sodium dichromate solution in a boiling tube.
Use a teat pipette to add 5–7 drops of ethanol, with shaking.
Cool the mixture in the tube under a tap. Note the sweetish smell of ethanal (acetaldehyde) at first, then becoming sharper as oxidation continues and forms ethanoic acid (acetic acid).
When the reaction has subsided, the mixture can be warmed gently; the smell of ethanoic acid will become more noticeable.
The process of how we would obtain ethanal free from ethanol is described in the explanations below.
In Chemistry, Ethanol undergoes oxidation in the presence of sodium dichromate plus sulphuric acid to yield ethanal and water.
The procedure for achieving this in the laboratory is as follows;
Step 1; Measure a quantity of a solution of sodium dichromate acidified in a dilute sulphuric acid and pour into a test tube.Step 2; Add excess ethanol. This is because if we don't do so there will be plenty of oxidizing agent to carry out a second operation which changes the aldehyde to ethanoic acid. However, we need only the aldehyde. Step 3; When the aldehyde ethanal begins to form which will be evident by the change in the colour of solution from orange to green, then the mixture should be distilled from the test tube and tbethe aldehyde collevted so that it doesn't undergo additional oxidation into ethanoic acid.Read more at; https://brainly.in/question/18574624
When titrating a NaF(aq) solution with HCl(aq), the equivalence point will occur at a pH value ______ .
a) above 7 because it is determined by NaF(aq)
b) below 7 because HCl(aq) is a strong acid
c) below 7 because it is determined by HF(aq)
d) at 7 because it is determined by H2O(l)
At the equivalence point, the NaF completely reacts with the HCl
The correct option that gives the equivalence point when titrating NaF solution with HCl(aq), occur at a pH value is option c);
c) Below 7 because it is determined by HF (aq)
Reason:
The ionic equation of the reaction taking place in the titration is presented as follows;
NaF + HCl → HF + NaClNa⁺ (aq) + F⁻ (aq) + H⁺ (aq) + Cl⁻(aq) → HF (aq)+ Na⁺(aq) + Cl⁻(aq)Therefore, by removing the spectator ions, we get;
F⁻(aq) + H⁺(aq) → HF(aq)Therefore;
The net ionic equation is the formation of hydrofluoric acid, HF, which is a
weak acid, therefore, the pH value will be below 7 because it is determined
by HF
Learn more about equivalence point here: titration
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In 1–2 sentences, explain why weather can be predicted only as probable, not definite.
Answer:
Meteorologists use computer models to predict the weather. And computational power has come an extended way. Yet meteorologists still have trouble correctly predicting the weather over some days. Sometimes they don’t even comprehend right over 24 hours! Why does this happen? Their ability to predict the weather is restricted by the number of available data, the time available to research it, and therefore the complexity of weather events.
Explanation:
Expressing personal ability to predict weather is limited by the amount of data available, the amount of time available to research it, and thus the complexity of weather events.
What is weather forecasting?Weather forecasting is the prediction of the weather using physics principles supplemented by a variety of statistical and empirical techniques.
The goal of weather prediction is to provide information that people and organizations can use to reduce weather-related losses.
It also improve societal benefits such as life and property protection, public health and safety, and economic prosperity and quality of life.
As much information as possible about the current weather and the state of the atmosphere is gathered.
Temperature, pressure, humidity, and wind speed observations are collected from around the world and fed into powerful supercomputers.
Three factors limit the ability to predict the weather:
The amount of available data.The time available to analyze it.The complexity of weather events.Thus, weather can be predicted only as probable, not definite.
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Which season is signaled by warmth and new life after a cold period?
1. winter
2. summer
3. spring
4. fall
The season that is signaled by warmth and new life after a cold period is the spring season.
There are four seasons of the year; winter, spring, summer and autumn(fall). In these four seasons, the coldest season is the winter season which is characterized by extreme temperatures and snow.
Immediately after this extremely cold season comes the spring which is a warm season. In this season, plants begin to blossom again as the rains begin to fall.
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31. Why would a valence electron be easier to steal from a Francium atom than a Fluorine
atom? Give two reasons.
1.
2
Answer:
1. Because a Francium atom is deeper down the alkali metals, it is much easier to lose a valence electron.
2. A fluorine atom can easily gain a valence electron, but it could not easily lose a valence electron because it is one electron away from filling the outer shell
Explanation:
The answer is the explanation
Please select the word from the list that best fits the definition
The compound, CH3COOH, is an example of which type of organic compound?
alcohol
amine
amino acid
carboxylic acid
Answer:
carboxylic acid
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help please thank you!!!!
Answer:
I think the coefficient is 4
calculate the volume of the gas in the balloon using the equation for volume of a sphere
Answer:
We can just use the formula for the volume of sphere which is 4/3 PI R cubed R is the radius. So if you have a balloon that's a sphere.
Explanation:
Do you think more foam will form if the ice cream is added to the glass before the root beer or after the root beer?
Answer:Sure, any carbonated soda will create bubbles when it's poured into a glass, but just add ice cream and a root beer float foams up like nothing else!
Explanation:
PLEASE HELP ME!!!!! I NEED REAL HELP PLEASE I KEEP GETTING NON REAL ANSWERS!!
You are required to write a MINIMUM of 5 sentences. This means you can always do more than 5 sentences, but no less.
I will not be grading your spelling or grammar. I'm looking for Science vocabulary and understanding of the concepts..
(minimum of five sentences. If you can't count five sentences then write some more)
We have been talking about plant and animal cells these past weeks. Plant cells have two organelles that animal cells do not contain. Name the two organelles that can be found in plant cells but not in animal cells and describe what each of those organelles do.
Plant cell Organelles
Cell wall : The outer most covering of the plant cell is the cell wall. The main constituent of it is cellulose. The main functions of the cell wall are, to maintain the shape of the cell, support and protection of the cell.Chloroplasts : Chloroplasts are organelles that conduct photosynthesis, where the photosynthetic pigment chlorophyll captures the energy from sunlight, converts it, and stores it in the energy-storage molecules ATP and NADPH while freeing oxygen from water in plant and algal cells.From its position in the periodic table, determine which atom in each pair is more electronegative: (a) N or P (b) N or Ge (c) S or F (d) Cl or S (e) H or C (f) Se or P (g) C or Si
Answer:
p, get, s, s, c, se, SIse hhgggggggg I no
Answer:
1) Cl
2) O
3) O
4) S
5) N
6) P
7)N
Explanation:
Which option correctly shows the concentration of H3O+ ions in pure water?
7 mol/L
1.0 × 10-7 mol/L
1.0 x 10-14 mol/L
14 mol/L
Answer:
C 1.0 x 10-14 mol/L
Explanation:
also do you do connections academy?
I will mark brainlist please help
1) What is the concentration of a solution that contains 6 moles of solute in 2 liters of solution
• 6M
• 12M
• 7M
• 3M
2) what is the number of moles of solute in 250 mL of a 0.4M solution?
• 0.1 mol
• 0.16 mol
• 0.62 mol
• 1.6 mol
3) the molality of a solution containing 8.1 moles of solute in 4847 g of solvent is
• 39m
• 1.7m
• 0.17m
• 598m
4) which of the following is unchanged when a solution is diluted by addition of solvent?
• volume of solvent
• mass of solvent
• number of moles of solute
• molarity of solution
Answer:
1)3M
2)0.1 moles
3)1.7m
4) number of moles of solute
Which of the following are uses for radiation? Check all that apply.
O A. Food preservation
B. Energy production
C. Medical applications
D. Dating artifacts
(I have a feeling it’s b and c but I want to double check )
Answer:
b and c
Explanation:
b nuclear energy and d is radiology dating if I am correct
How to Study and make notes and what to do if everything seems important
Describe how you can figure out how many grams of a COMPOUND if you know how many moles there
are.
Which of the following is an opening on the surface of a planet or moon that allows material warmer than its surroundings to escape from its interior?
Question 10 options:
Tsunami
Volcano
Tornado
Earthquake
A volcano can be defined as an opening on the surface of a planet that allows material warmer than surroundings to escape from its interior. Therefore, option (B) is correct.
What is volcano?A volcano can be described as an opening in the earth's crust through which lava, volcanic ash, and gases escape from its interior. When this material escapes, then eruptions can be calmer, with gentle flows of material, or can be explosive, sending material high into the sky.
When pieces of Earth's crust slowly move away from each other, magma can rise. The magma rises to fill in space and underwater volcanoes can form.
The tectonic plates can also move toward each other when magma rises. The part of Earth's crust can be forced deep into its interior which can cause the crust to melt and rise as magma.
The magma can also rise over hot spots. Hot spots can be defined as the hot areas inside of Earth where magma heats up and becomes less dense. With each way of rising the magma can form volcanoes.
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Help
Mg + HCl MgCl2 + H2
Double replacement – two compounds switch parts with one another.
AgNO3 + K2SO4 Ag2SO4 + KNO3
Answer:
Mg + 2 HCl = MgCl2 + H2
2 AgNO3 + K2SO4 = Ag2SO4 + 2 KNO3
Explanation:
What does the number of
protons tell us about an
element?
Answer:
it determines an element's atomic number..
What isotope has a mass of 79 and 44 neutrons?
Answer:
bromine
Explanation:
The atomic mass of bromine (Br) is 79.90. There are two main isotopes at 79 and 81, which average out to the 79.90amu value. The 79 has 44 neutrons and the 81 has 46 neutrons. While it won't change the average atomic mass, scientists have made bromine isotopes with masses from 68 to 97.
3
Convert 5.492 x 104 grams to units of micrograms.
(Click to select 4
x 10
ug
Answer:
5.492*10^10
Explanation:
1g=1000000microgram
the ___is the area that allows us to pinpoint the location of pain, identify a texture and be aware of how our limbs are positioned?
Answer:
The somatosensory cortex is a region of the brain which is responsible for receiving and processing sensory information from across the body, such as touch, temperature, and pain.
Area 1 specifically is important in sensing the texture of an object. :)
Hope this helps!