Mass - practice for 13 year olds - page 9 of 27
Number of problems found: 527
- Calculate 55793
Calculate the material amount of a water sample weighing 1 kg. M (H 2 O) = 18 g / mol. - Aluminum cylinder
The aluminum cylinder weighs 1400 g and is 26 cm high. Its density is 2700 kg/m³. Calculate the base area of the cylinder and express the result in cm². - KOH
How many g of 20% KOH solution do we need to mix with 500 g of 30% KOH solution to obtain a 25% KOH solution? - Ice to boiling water
Calculate the heat needed to convert 5kg of ice at a temperature of -5°C to water with a temperature of 100°C. c (water) = 4200 J/°C/kg, c (ice) = 2100 J/°C/kg. The mass group heat of solidification of water is l = 334 kJ/kg. Calculate the heat that 1k g - Mass fraction
Two teaspoons (24 g) of sugar are dissolved in a cup with 500 g of tea. Calculate the weight fraction of sugar in the tea. - Salami 54461
500 g of salami costs 4.2 euros. How much do we pay for 0.75 kg of salami? - A farmer 3
A farmer sells 9.3 kg of pears and apples at the farmers market. 3/4 of this weight is pears, and the rest is apples. How many kilograms of apples did she sell at the farmer's market? - Two-fifths
Two-fifths (2/5) of a pound of chicken for each person. How many pounds of chicken are required if eight people are to feed? - Beef taxation
In December, beef cost € 5.71 per 1 kg. How much should the price of 2.5 kg of beef change if VAT changed from 20% to 10%? How much will 2.5kg cost in January? - Chocolate bar
Shen's chocolate bar is 54% cocoa. If the weight of the chocolate bar is 54 grams, how many grams of cocoa does it contain? Round your answer to the nearest tenth. - The floor
The floor collapsed because three and a half times the amount it had been designed to hold had been stored in the room. If we had stored 980 tons in the room, what amount was the floor designed to hold? - Chad buys
Chad buys peanuts in 2-pound bags. He repackages them into bags that hold 5/6 pounds of peanuts. How many 2-pound bags of peanuts should Chad buy to fill the 5/6-pound bags without having any peanuts left over? - Big school kitchen
Suppose 250 learners can be fed by 75kg. How many kg can 600 learners be fed? - Lead melt
Find the heat needed to melt an object made of lead weighing 250g and an initial temperature of 35°C. Lead melts at 327°C at normal pressure. Mass heat capacity of lead c = 129 J/kg • K and mass latent heat of lead lt (t is the subscript) = 22.6 kJ/kg. - Two-thirds 49311
Chocolate pieces hang on a Christmas tree. One-third is made of milk chocolate, two-thirds of the rest is dark, and 200 g is white chocolate. How much do all the pieces weigh together? - There
There is 5 l of water with a temperature of 20°C in the bucket. We add 3 liters of hot water. The resulting temperature will be 30°C. What was the temperature of the hot water? - Kilograms 48761
Matthew paints his room. He paints square walls. He painted a wall with a side of 3 m and consumed 5 kg of paint. How many kilograms of paint will he need on a wall with a side length of 6 m? - Feed to hay
How many tons of water do we have to dehydrate from 8 tons of feed if the original moisture is 54 percent to get hay with a moisture content of 15 percent? Round to two decimal places. - School model
The beech school model of a regular quadrilateral pyramid has a base 20 cm long and 24 cm high. Calculate a) the surface of the pyramid in square decimeters, b) the mass of the pyramid in kilograms if the density of the beech is ρ = 0,8 g/cm³ - Diameter 48211
What is the diameter of the ball (for men) if it weighs 7,250 g and ρ = 7.8g / cm³
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