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Questions (56)

sdvsd
1. 1 answer
2. 187 views
In the equation below, suppose 11 grams of Zinc (Zn) react with 12 grams of Hydrogen Chloride (2HCl) to form 16 grams of Zinc
1. 4 answers
2. 1,421 views
How much KNO3 will dissolve in 200ml of water at 50 degrees Celsius?
1. 2 answers
2. 660 views
I'm trying to work on this practice question But got confuse on this question:find the value of P = Q ( 1 - 1.03^-20 / 0.03)
1. 3 answers
2. 477 views
how many times as great as 15^9 is 15^10?
1. 1 answer
2. 348 views
5.0 grams of solid Ce2(SO4)3 was added to 100 mL of water.What is the total mass?
1. 2 answers
2. 602 views
1 junction of a thermocouple is kept in melting ice and the other in boilin H20.The readin of currnt on a micro ammeter is
1. 1 answer
2. 398 views
A Hg thermomtr is calibrated by immersing it in melting ice and thn in boiling H20.The column of the Hg is respctively 2.9cm
1. 1 answer
2. 377 views
The density of helium is 0.179kgm3.A Baloon hs a capacity of 27m3 and a mas of 12.5kg whn empty.a)fnd the total mas of baloon n
1. 2 answers
2. 928 views
What is the volume of a metal which weighs 28g less in kerosene and the densty is 800 kgm3 than it does in air
1. 2 answers
2. 1,223 views
I'm abit confusd hw to find the% of H2O of crystallization Na2SO4.10H20
1. 1 answer
2. 446 views
Can u help me plz.A compound producd 1200cm3 of N2 @ rtp.a) how many N2 molecules were in the sample & wat mas of N2 is producd
1. 1 answer
2. 377 views
Ben has 1L of 0.1mol/dm3 solution of KI & wish to take a sample containing 8.3g of solute.What volume should he measure
1. 2 answers
2. 965 views
An element x has 3 isotopes,a,b,c.a has 5% abundance b,20%,c,75% &a has a mas of 40,b 42,c 45.what is the essntial differnce in
1. 1 answer
2. 393 views
A density bottle has a mass of 35g when empty,85g when filled with water and 75g when filled with kerosene.Calculate the density
1. 4 answers
2. 1,412 views
You are provided with supply of 2M SO4.Explain how you may prepare 500ml of 0.5M SO4.
1. 1 answer
2. 355 views
50ml of 0.3M SO4 is titrated against KOH & end point is reached when 35.3 ml of the acid is added.find the molarity of the
1. 1 answer
2. 398 views
A sample of a compound is found to contain 21.84kg of phosphorous &28.16g of O2.find its emphirical formula
1. 1 answer
2. 393 views
Calculate the mass of carbon dioxide produced by burning 0.60kg of methane
1. 1 answer
2. 476 views
Calculate the % by mass of carbon in octane
1. 2 answers
2. 656 views
In the reaction:Zn+ 2HCL>ZnCl2+h2.What mass ZnCl2 is produced when 10g of zn reacted
1. 2 answers
2. 591 views
In the reaction:Zn+ 2HCL>ZnCl2+h2.What mass ZnCl2 is produced when 10g of zn reacted
1. 4 answers
2. 1,692 views
An element with relative atomic mass 20.8 is found to contain 2 isotopes having a relative atomic mass of 20 and 21.Find the %
1. 3 answers
2. 627 views
What is the dormain and range of h(x)=|2x -3|-1
1. 1 answer
2. 389 views
What is the dormain and range of g (x) =square root of x-5
1. 1 answer
2. 338 views
What is the dormain and range of square root of x-5
1. 1 answer
2. 437 views
Given that P(x)=x(x^2-13) +12,express P(x)as a product of linear factors.
1. 1 answer
2. 407 views
Given that x-2 is a factor of x^3-4x^2-2x +k,find k.
1. 1 answer
2. 473 views
A student lifts a box that weighs 185N.The box is lifted0.8m.the stdnt drps the bx.hw much gravity do on the bow whn it
1. 2 answers
2. 593 views
A rope is usd to pull a box 15mt across the floor.the rpe is @an angle of 46dgree to the horizntal. A force of628N is dne by the
1. 3 answers
2. 524 views
A man pushs a cart wt a force of 36N directd@ an angle 25dgree belw the horizontal. The horizntal comp oe the force is 32.6N.The
1. 1 answer
2. 465 views
A persn carries a 218N suitcse up a stairs.the displcment is 4.20m vertically & 4.60m horizntally. A.hw much work does the
1. 3 answers
2. 612 views
A car of mass 1200kg travelling @ 72 km/h is brought to rest in 4s and has a deceleration of 5m/s find the distance moved during
1. 3 answers
2. 1,148 views
A load of 500N is raised 0.2m by a machine in which an effort of 150N moves 1m.What is a) the work done on the load b)the work
1. 5 answers
2. 1,110 views
A)When the energy input to gas fired power station is 1000MJ,the electrical energy output is 300MJ.What is the efficiency of the
1. 5 answers
2. 3,956 views
In loading a lorry a man lifts boxes each of weight 100N throughta height of 1.5 m. a)how much work does he do in lifting 1 box
1. 7 answers
2. 4,158 views
A car of mass 1200kg travelling @ 72 km/h is brought to rest in 4s.Find a) the average deceleration b)the average braking force
1. 7 answers
2. 3,026 views
A hiker climbs a hill 300m high.If she weighs 50kg,calculate the work she does in lifting her body to the top of the hill
1. 6 answers
2. 3,408 views
How much work is done when a mass of 30N is lifted vertically through 6m
1. 3 answers
2. 972 views
A block of mass 2kg is pushed along a table with a constant velocity by a force of 5N.When the push is increased to 9N,what is
1. 9 answers
2. 2,928 views
A chair lift carries people of average mass 75kg to a height of 450m above the starting point. Calculate a) the work done by the
1. 2 answers
2. 980 views
A box of mass 5 kg is pulled along a horizontal frictionless surface by a force of 40N inclined @ 30dgrees. Calculate A)the work
1. 2 answers
2. 753 views
An 80kg golf hall is struck for a period of0.03s wt a force of 500n.the bal accelerate frm the tree.wat is its final speed.
1. 3 answers
2. 391 views
An archa fires an arrw of mas 96g wt a velocity of 120m/s @a target of mas 1500g hangin frm a piec o strin frm a tal tree. If
1. 1 answer
2. 422 views
Calculate the average translational kinetic energy (kJ/molecule) for a molecule of NH3 at 431 K, assuming it is behaving as an
1. 3 answers
2. 698 views
If 0.433 mol of gaseous CS2 and 1.62 mol of gaseous H2 are reacted according to the balanced equation at 454 K and in a 40.0 L
1. 3 answers
2. 705 views
A gas sample containing only SO2, PF3 and SF6 has the following mass percent composition: 30.4% SO2 and 28.4% PF3. Calculate the
1. 6 answers
2. 674 views
A gas sample containing only SO3, CH2O and C2H6O2 has the following mass percent composition: 65.1% SO3 and 8.79% CH2O.
1. 3 answers
2. 491 views
A 355.0 mL cylinder containing SO3 at a pressure of 0.700 atm is connected by a valve to 0.559 L cylinder containing COCl2 at
1. 2 answers
2. 565 views
Calculate the molality (m) of a 6.56 kg sample of a solution of the solute acetone dissolved in the solvent ethanol if the
1. 3 answers
2. 840 views
A 1.33 m solution of the solute diethyl ether dissolved in the solvent tetrahydrofuran is available. Calculate the mass(kg) of
1. 3 answers
2. 1,220 views
∆H⁰rxn, for the reaction of Ca(s) + 2H+(aq) -> Ca2+(aq) + H2(g) is -544 kJ/mol.∆H⁰rxn, for the reaction of CaO(s) +
1. 5 answers
2. 901 views
An element has hcp packing with a hexagonal unit cell. Its density is 21000 kg/m3 and the unit cell volume is 2.94 x 10-23 mL.
1. 3 answers
2. 529 views
An element has ccp packing with a face-centered cubic unit cell. Its density is 12400 kg/m3 and the unit cell volume is 5.50 x
1. 3 answers
2. 841 views
The element palladium has ccp packing with a face-centered cubic unit cell. The density of Pd is 12 g/cm3. Calculate the volume
1. 2 answers
2. 538 views
pierce co has a june 30 fiscal year end. it estimated its annual property taxes to be 24000 based on last year's property tax
1. 1 answer
2. 1,319 views

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