Answer:
See below...
Explanation:
6.79 = 100 ( 1/2)^n solve for n = number of half lives
3.88 half lives
3.88 * 24000 = 93 130.7 years
Small bodies from which the planets formed are called _____.
Answer:
The small bodies from which the planets formed are called planetesimals.
If 10 moles of a gas are at a pressure of 3.6 atm and at a temperature of 27°C, what is the volume of the container that the gas is in.
Answer:
68.4 liters
Explanation:
PV = nR T R = gas constant = .082057 L atm / K-mole
n = 10 T = 27C = 300.15 K
3.6 V = 10 * .082057 * 300.15 solve for V = 68.4 liters
Identify those elements that can be isolated by electrolysis of their aqueous salts. (Select all that apply.)
lithium
tin
strontium
chlorine
Please solve the question.
Answer:
B
Explanation:
I think it might be B because if the student's hypothesis was incorrect why redo it and make sure the results are the same as last time if it was already incorrect before.
is CH3NH2O ionic or covalent
Answer:
i think ionic?
Explanation:
hope this helps
What is the molarity of a solution that is prepared by adding 3 moles of CaSO4 in 1.5 L of water?
Answer:
[tex][CaSO_4] = 2 mol/L[/tex]
Explanation:
[tex][CaSO_4] = \frac{3 mol}{1.5 L} = 2 mol/L[/tex]
Carbon Dioxide's Effects on Temperature (Edmentum)
Task 2:
Carbon Dioxide's Effects on Temperature
In this activity, you will use sodium bicarbonate tablets to see the effects of carbon dioxide on temperature. Sodium bicarbonate tablets are effervescent tablets that release carbon dioxide when dissolved in water.
Estimated time to complete: 1 hour
You will need these materials:
2 empty two-liter plastic bottles (or two similar-sized plastic containers with tight-sealing lids), rinsed
2 thermometers (not mercury)
1 liter of water, room temperature
a ball of clay, about 2 inches in diameter (needed only if you’re using two-liter plastic bottles)
2 sodium bicarbonate tablets (such as Alka-Seltzer)
a lamp with a 150-watt incandescent bulb (if direct sunlight is not available)
Follow these steps to set up the experiment. Then answer the question in part A.
Fill both bottles with water until they are half full.
In one bottle, place two sodium bicarbonate tablets.
Plug the opening of the two bottles tightly with clay. The clay will act as the cap.
Place one thermometer in each bottle by carefully piercing it through the clay, so that the thermometer dangles in the air inside the bottle. Stay safe: do not use mercury thermometers in the event that they might break. The bottles must remain tightly sealed. The thermometer must not touch the water.
Put both bottles in front of the lamp or in direct sunlight. Turn on the lamp and let the bottles stand for one hour. Stay safe: To avoid electrocution, keep all water away from electrical sources.
Hypothesis and Data Collection
Part A
Write down your predictions. After an hour, do you think there will be a temperature difference between the two bottles? Explain.
Part B
After one hour, record the temperatures. Write down your results.
Analyze and Extend
Part A
Was your prediction about the temperatures in the two bottles correct? Explain.
Part B
In your experiment, what is the dependent variable and what is the independent variable?
Part C
The tablets were a source of carbon dioxide. What can you conclude about the effect carbon dioxide has in the atmosphere?
Part D
The burning of fossil fuels, such as gasoline, coal, and oil, increases the amount of carbon dioxide in the atmosphere. Based on your experiment, what effects could this burning have on Earth’s temperature?
Part E
Mary is concerned about greenhouse gases in the atmosphere. She wants to buy an electric car that doesn’t use gasoline at all. What questions should Mary ask about electric cars to ensure that she is making a good choice for the environment?
Dispose of your waste properly:
Pour the water down the drain.
Rinse and recycle the plastic bottles.
Reuse the clay or place it in the trash.
Answer:
“You Asked” is a series where Earth Institute experts tackle reader questions on science and sustainability. Over the past few years, we’ve received a lot of questions about carbon dioxide — how it traps heat, how it can have such a big effect if it only makes up a tiny percentage of the atmosphere, and more. With the help of Jason Smerdon, a climate scientist at Columbia University’s Lamont-Doherty Earth Observatory, we answer several of those questions here.
(2 Question 6 Without modifying the apparatus, how could the reliability of the results be increased?
Explanation:
Reliability can be improved by completing each temperature more than once and calculating an average.
How many moles are in 7.8 g of acetamide, CH3CONH2?
Answer:
.13 moles
Explanation:
To begin this problem:
First you need to find the molar mass of acetamide, to do so:
C=12g, H=1.008g, O=16g, and N=14g2(12)+5(1.008)+1(16)+1(14)=59.04To find moles when given grams, we divide grams by the molar mass.
7.8g/59.04g/mol=.13 molesUsing 2 sig figs from what we are given, this is our final answer.
One pound (1.00 lb) of body fat is equivalent to approximately 3.488 x 103
kcal.
The average amount of calories burned during running is 125 kcal/mile.
How many miles does an athlete have to run to burn off 1.00 lb of body fat?
Show your calculations.
Your Answer:
1 mil
2400
270
Since one pound (1.00 lb) of body fat is equivalent to approximately 3.488 x 10^3 kcal, then 27.9 miles must be covered to burn off one pound.
What is energy?Energy is defined as the ability to do work. Now we are told that one pound (1.00 lb) of body fat is equivalent to approximately 3.488 x 10^3
kcal.
Hence;
If 125 kcal is burnt by running one mile
3.488 x 10^3 kcal is burnt by running x miles
x = 3.488 x 10^3 kcal * 1 mile/125 kcal
x = 27.9 miles
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Another word for axis tilted on its side
Please help!!
How many O2 molecules occupy a 1.0 L flask at 65°C and
103.7 kPa?
Select one:
O a. 28 molecules
O b. 2.2 x 1022 molecules
O c.
1.1 x 1023 molecules
O d.
1.6 x 1025 molecules
e. 1.7 x 1025 molecules
Answer:
B, 2.22×10^22 molecules
Explanation:
Given PV=nRT, n=PV/RT
n=103.7×1.0/8.314×(65+273.15)
= 0.0368858... moles
Given n= number of particles/avogadros number
number of particles=n×avogadros number
number of particles = 0.03688...×6.02x10^23
= 2.22×10^22 molecules
i need this done by tonight!!! GIVING BRAINLIEST TO CORRECT ANSWER
Match the terms to their definition.
Water circulation created by prevailing wind systems. The Gulf Stream is an example.
The length of open sea over which wind can blow steadily to create waves.
The amount of dissolved salt in a liquid.
The distance from the crest of one wave to the crest of another.
Water circulation created by differences in density.
This is what moves forward and through a wave.
The cyclical process of the changing state and movement of water around the Earth through evaporation, condensation, and precipitation.
As the amount of salt in water increases, the density of the water _________.
The type of energy possessed by moving water.
The rising of ocean water bringing nutrients up from the deep.
1.
The water cycle
2.
vapor transport
3.
salinity
4.
increases
5.
decreases
6.
surface currents
7.
Coriolis Effect
8.
deepwater currents
9.
trough
10.
wave period
11.
wavelength
12.
water molecules
13.
energy
14.
crest
15.
fetch
16.
electrical
17.
kinetic
18.
downwelling
19.
upwelling
Answer:
Gulf Stream. The Gulf Stream is a warm surface ocean current which originates in the Gulf of Mexico and flows northeast across the Atlantic, driven by the prevailing southwest winds. It influences the climate of the UK and Northwest Europe by bringing with it humid mild air.
Kathleen makes iced coffee by adding ice to her room temperature coffee in a glass. What statement explains what is taking place inside her glass?
The ce molecules will slow down over time.
The coffee molecules will speed up over time.
The cold is transferred from the ice to the coffee.
The heat is transferred from the coffee to the ice.
Answer:
The answer is the heat is transferred from the ice to the coffee.
Explanation:
Hot molecules tend to transfer to colder molcules, which causes the ice to melt and makes the coffee colder.
Hope this helps! :)
Why does the moon and the sun have the same mass.
Why does the moon and the sun have the same mass?
Answer: The difference is that, on the moon, you are much lighter than on the Earth, but you still have the same mass
How much energy is needed to raise the temperature of 15.21 g of a substance with a specific heat of 1.65 J/g°C from 137.0 °C to 234.3 °C?
Answer:
2441.9 Joules
Explanation:
This is a sensible heat change problem.
Energy = Specific Heat Capacity x Mass x Change in Temperature
To find the change in temperature, you need to use this formula: Temperature Final - Temperature Initial.
234.3 - 137.0 = 97.3
Energy = 1.65 x 15.21 x 97.3
Multiply that equation, and you get your answer! I hope this helps!
What’s the answer to this?
Benzene
Benzene has low density than the water itself of about 0.9 g/cm³
Low denisty object than the water usually floats on the water.
Another example: orange peel which floats on water has density of about 0.84 g/cm³
What is another word for a substance that is a base?
A.
indicator
B.
amphoteric
C.
buffer
D.
alkaline
Answer:
D) alkaline
Explanation:
a) Is ethanoic acid a weak electrolyte or a strong electrolyte, give a reason for your answer. Show the dissociation of ethanoic acid in water.
Answer:
Acetic acid is a weak electrolyte because its dissociation constant is small meaning there will be few ions in solution to conduct electricity.
Weak electrolyte are very less or partially ionized and strong electrolytes are completely ionized or 100% ionized. Ethanoic acid is weak electrolyte.
How to determine whether a acid is weak or strong electrolyte ?
To determine whether the acid is strong electrolyte or weak electrolyte check whether it is completely ionize or partially ionized. The molecular formula of ethanoic is [tex]CH_3COOH[/tex] and ethanoic acid is also called acetic acid. Ethanoic acid is weak electrolyte because it does not dissociate very much.
The dissociation of ethanoic acid in water:
[tex]CH_{3}COOH_{(aq)} + H_{2} O_{(l)}[/tex] ⇄ [tex]CH_{3}COO^{-}_{(aq)} + H_{3}O^{+}_{(aq)}[/tex]
Thus, from above conclusion we can say that Ethanoic acid is weak electrolyte and the dissociation of ethanoic acid in water is: [tex]CH_{3}COOH_{(aq)} + H_{2} O[/tex] ⇄ [tex]CH_{3}COO^{-}_{(aq)} + H_{3}O^{+}_{(aq)}[/tex]
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#SPJ2
Correct formula for barium hydroxide
Ba(OH)2
HOPE IT HELPS...!!!
Do you think a benitoite ring would be costly or inexpensive?
Answer:
I think it would be costly due to the fact that the gem is very rare and gorgeous. Also, the current prices are on average $3,000 per carat, so I would say that is pretty costly.
Explanation:
Hope this helps:)....if not then sorry for wasting your time and may God bless you:)
Many states require drivers to use hands-free cell phones only. A) TrueB) False
Answer:
True.
Explanation:
Typically, cars have built in radios for the reason of not using your phone. That's why you connect it with bluetooth to call, text, and use personal music instead of listening to the ones on the radio.
Answer:
True
Explanation:
It is to keep us safe. So, we answer calls without having to take our hands off the wheel. Although it is unsafe for that aswell. The best thing to do is have 0 things that would keep you from having your eyes on the road.
A particle has a velocity that is 70 % of the speed of light and weighs 206.8 times the mass of an electron. Find the wavelength of this particle?
SOLUTIONS
SHOW COMPLETE, CONVINCING WORK FOR THE FOLLOWING:
1.
A student is instructed to make 500.0 ml of 1.200 M silver nitrate solution for a lab. A stock solution of 5.00 M silver nitrate
is available. How many milliliters of the stock solution are required to make the solution needed for the lab?
120 mL
Answer: Because percent solutions can be expressed in three different ways, it is imperative that the type of percent solution be explicitly stated. If this information is not provided, the end user is left to "guess" whether w/v %, w/w %, or v/v % was used. Each percent solution is appropriate for a number of different applications. For example, commercial aqueous reagents, such as concentrated acids and bases, are typically expressed as weight/weight % solutions. For example, commercially available concentrated hydrochloric acid (HCl) is 37% by weight (w/w %). On the other hand, many dilute solutions used for biological research are expressed as weight/volume % (e.g., 1% sodium dodecyl sulfate, SDS). Volume/volume % solutes are also common, and are used when pure solutes in liquid form are used. For example, a 70 % (v/v) solution of ethanol can be prepared by dissolving 70 mL of 100% (i.e., 200 proof) ethanol in a total solution volume of 100 mL.
What is the molarity of the 8.76 g of Na2S dissolved in 0.500 L of solution?
Answer:
.224 M
Explanation:
To begin, we need to find the molar mass of Na2S
Na=22.99g, S=78.05g2(22.99)+1(32.07)=78.05To find Molarity, we use the equation M=moles/Liters of solution
We are given grams, so we must divide by the molar mass of Na2S to find moles.
8.76g Na2S / 78.05g/mol Na2S= .112 molesNow we use our Molarity equation:
.112 moles Na2S / .500L of solution = .224 MAs far as terrain, mountainous northern coast otherwise known as the
A. Sierra Nevada Mountains
B. Atlas Mountains
C. Rif Mountains
D. Appalachians
How much heat must be removed from 75.0 g of water at 90.0°C to cool it to 23.0°C?
Answer:
See below
Explanation:
75 g * ( 90 - 23) C * 1 cal / g-C
= 5025 cal = 21 034 .7 J
Ideal Gas Law 1
Calculate the volume of 3.00 g of carbon dioxide gas at 288K and 123.3 kPa.
Give your answer in litres to three significant figures. Do not include units.
Answer:
1•323
Explanation:
mass of carbon=12
mass of oxygen=2*16=32
no of moles = 3/44
PV=nRT
V=(0.06818*8.31*288)/123.3*10^3
Write the letter of the correct answer on the line
1.
-Which of the following is an opening
through which molten rock and gas leave a
volcano?
A pipe
B magma chamber
C crater
D vent
Answer:
D. Vent is the answer please
A Student Mixes 40. ML Of 0.10 M HBr(Aq) With 60. ML Of 0.10 M KOH(Aq) At 25°C. What Is The [OH-] Of The Resulting Solution?
After the complete neutralization reaction occurs, excess hydroxide ion is left unreacted and concentration of the hydroxide ion, [OH-] is 0.02 M.
What is the concentration of the hydroxide ion, [OH-]?The hydroxide ion concentration is the amount in moles of hydroxide ion in a solution.
The hydroxide ion concentration is written as [OH-].
The equation of the reaction is given below:
[tex]HBr(aq) + KOH(aq) \rightarrow KBr(aq) + H_2O(l) \\ [/tex]
1 mole of HBr reacts with 1 mole of KOH
Moles of HBr = 40 mL × 0.1 M = 4 mmmoles
Moles of KOH = 60 mL × 0.1 M = 6 mmoles
Moles of [OH-] = 6 - 4 = 2 mmoles
Volume of solution = 100 mL
[OH-] = 2mmoles/100 mL = 0.02 M
Therefore, the concentration of the hydroxide ion, [OH-] is 0.02 M.
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