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Solve for x: 2x + 5 = 15
5
A triangle has sides of lengths 5 cm, 12 cm, and 13 cm. Is it a right triangle?
Yes
Find the area of a circle with a radius of 7 cm.
153.86 cm2
A shop offers a 20% discount on a $50 item. What is the final price?
40
Solve for y: 3y - 8 = 2y + 5
13
A car travels 240 km in 4 hours. What is the average speed?
60 km/h
Find the perimeter of a rectangle with a length of 8 cm and a width of 5 cm.
26
A square has an area of 49 cm2. Find its perimeter.
28
Calculate the molar mass of H2O.
18 g/mol
How many moles are in 36 g of H2O?
2
Balance the equation: H2 + O2 => H2O
2H2 + O2 => 2H2O
If 5 g of NaCl is dissolved in 100 g of water, what is the mass percentage of NaCl in the solution?
4.76%
How many atoms are there in 2 moles of oxygen gas (O2)? (Avogadro's number = 6.002 x 10^23)
2.41 x 10^24 atoms
What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-3 M?
pH = -log(1 x 10^-3) = 3
How many grams of NaCl are in 0.5 moles?
29.25 g
What is the volume of 2 moles of gas at standard temperature and pressure?
44.8 L
