Physical sciences category

Physical sciences category

Space and astronomy

Posted by Kokoi12 some time ago

Discuss what will happen if a beam of white light with frequency between 4x1014 Hz to 7.9x1014 Hz is incident on both surfaces.

Posted by Linda Joy some time ago

Did you know a tractor beam can be produced using matter waves now in addition to light and sound waves?

Posted by bostjan64 some time ago

If an asteroid hits the Earth on election's eve, will the people still be able to vote?

Posted by Linda Joy some time ago

Will you be watching the eclipse or the meteor showers?

Posted by DancesWithWolves some time ago

Which Program Was Better : Lost In Space or Star Wars ?

Posted by Roaring some time ago

If you punch three holes in a container near the bottom, middle and near the top, and fill with water, which hole squirts the water farthest?

Posted by bostjan64 some time ago

At what temperature do ideas boil?

Posted by Creamcrackered some time ago

Does math exist in reality?

Posted by Gabriela4678 some time ago

Two samples of cooper(II) sulfate solution with concentrations of 0.080M and 0.30M were analysed using a spectrophotometer. Which sample would show the strongest absorption of light? PLS HELP ME. Im dumb in Chem :)

Posted by bostjan64 some time ago

What is your favourite heavy metal?

Posted by Lauren674 some time ago

Calculating concentration of fluoride in a homemade mouthwash.

Posted by Linda Joy some time ago

Will you be watching the perseids meteor shower?

Posted by Nicole Osborne some time ago

a) If 14.6 mL of HNO3 reacts with 25.0 mL of 0.750 M Ca(OH)2, what is the molarity of the HNO3 solution? b) What volume of 0.300 M Ca(OH)2 is required to react with 250.0 mL of 0.500 M HNO3?

Posted by Sylvester10 some time ago

What is the criterion for choosing the type of Van der Waals correction in Quantum Espresso calculations?

Posted by Nicole Osborne some time ago

What volume (in L) of hydrogen at STP is produced as sulfuric acid (H2SO4) acts on 102 g of metallic calcium (Ca).

Posted by Nicole Osborne some time ago

A) Starting with 600.0g of glucose, what is the theoretical yield of ethyl alcohol? B) If 76.9g of C2H5OH was obtained, what was the percentage yield?

Posted by Nicole Osborne some time ago

For the reaction: 2Fe + 3CuCl2 = 2FeCl3 + 3Cu. 10g of Fe and 18.0g of CuCl2 are mixed together and a reaction occurs.

Posted by Nicole Osborne some time ago

What is the maximum weight of SO3 that could be made from 10.0 g of SO2 and 5.00 g of O2 by the following reaction?

Posted by Nicole Osborne some time ago

How many grams of iron (III) oxide would ideally be formed by the reaction of 55.0 g Fe with excess oxygen gas? If the actual reaction involving this same 55.0 g Fe produced only 26.9 g of iron (III) oxide, what would be the percent yield?

Posted by Nicole Osborne some time ago

Determine the mass of CO2 and H2O produced on combusting 140 g of C2H2 in the presence of excess O2.

Posted by Nicole Osborne some time ago

How many grams of Al2O3 can be formed when a mixture of 6.9 g of aluminum and 12.8 g of oxygen is ignited? Which substance is in excess and how many grams is in excess?

Posted by Nicole Osborne some time ago

The heating of NaNO3 decomposed it to NaNO2 and O2. How many grams of NaNO3 would you have to decompose to produce 2.63 g of O2?

Posted by Nicole Osborne some time ago

Upon the addition of heat to an unknown amount of KClO3, 0.48 g of oxygen was produced. How many grams of KClO3 reacted?

Posted by Nicole Osborne some time ago

225 g of calcium carbonate is decomposed to yield calcium oxide and carbon dioxide, according to the equation: CaCO3(s) → CaO(g) + CO2(g) Only 28.2 L of carbon dioxide is recovered at STP. a) Calculate the theoretical yield of CO2 (as a volume of gas at STP). b) Determine the percent yield of the reaction.

Posted by bostjan64 some time ago

Are you willing to drink hydrogen hydroxide?

Posted by bostjan64 some time ago

Where can I get metal test coupons?

Posted by Mikayla N Kriechbaum some time ago

345 kJ of heat energy is released when a sample of liquid water is frozen to solid ice. How many grams of water were frozen? heat of fusion of water = 334 J/g

Posted by bostjan64 some time ago

What chemical change causes oil-based substances to yellow as they age?

Posted by Imogen58princess some time ago

How to convert -log mol/kg to mg/kg?

Posted by Linda Joy some time ago

Are you ready to sign up for the U.S. Space Force?

Posted by Linda Joy some time ago

What do you think of the new smart clothes that generate electricity?

Posted by Perkulator some time ago

KHP titration help

Posted by Perkulator some time ago

titration help please

Posted by Perkulator some time ago

write the condensed, complete, and net ionic equations for any reaction that occurs between K2CrO4(aq) and Fe(NO3)3(aq).

Posted by bostjan64 some time ago

Weight on an elevator problem

Posted by Dona some time ago

explain Hydraulic Jack Oil and its Fluid Properties ?

Posted by bostjan64 some time ago

What is the freezing point (or gel point) of Gasoline?

Posted by bostjan64 some time ago

Batman vs. Joker

Posted by Linda Joy some time ago

How can such a tiny thing be such big news?! First time ever quantum entanglement in space!

Posted by Luis Maldonado some time ago

The Velocity of a 600kg automobile is changed from 10 m/s to 44 m/s by an applied force. Calculate that force.

Posted by Shiva Abhishek some time ago

Find total energy of body of 5kg mass,which is at a height of 10m from earth and falling downwards with a velocity of 20m/s.take acceleration due to gravity as 10m/s

Posted by Victoria Tapia some time ago

Physics Question

Posted by Linda Joy some time ago

What changes flavor as it travels?

Posted by bostjan64 some time ago

What is the cause of the nonparabolicity of the energy-size dependence for the lowest optical absorption transition of quantum dots?

Posted by Linda Joy some time ago

True or False: Massless particles don't experience time.

Posted by Linda Joy some time ago

Do you ever wonder if our entire universe is rotating around something larger we haven't discovered yet?

Posted by Stpauligerle some time ago

CERN makes terrible error

Posted by Linda Joy some time ago

Did you know NASA's Psyche Mission launch date has been moved up a year?

Posted by Linda Joy some time ago

Did you see this? AI is going to help ET find his home!

Posted by Aman Pal some time ago

Estimate the speed of sound in air at standard temperature and pressure the mass of one mole of air is 29.0 into 10 ki power minus 3 kg

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