It requires 2,500 joules to raise a certain amount of water (c = 4.186J/g°C) from 20.0°C to 65.0°C.

What is the mass of the water that is being heated?

a 80 g

b 138

c 40 g

d 158 g

2Fe2O3 + 3C 4Fe + 3C02 You add 28 grams of carbon. You find the actual yield to be 81.2 grams of CO2. What is the percent yield of CO2 if the theoretical yield is 102.6g? 126.35% 0.79% 1.26% 79.14%

A 15.0 mL sample of a liquid has a mass of 12.3 g. What is the density of the liquid? A. 0.820g/mL B. 1.22g/mL C. 185g/mL D. 12.3g/mL

Which is NOT part of the Cell Theory?

Which of the following cannot be determined from the spectrum of a star?

Convert the following75 mL to L

The atomic and mass numbers for four different atoms are given below. Which two are isotopes of the same element? Atom Atomic number Mass number a 100 257 b 101 257 c 101 260 d 102 259 A.) A and B B.) B and C C.) B and D D.) C and D

As water is added to a 0.10 M NaCl aqueous solution, the conductivity of the resulting solution

Which process creates food for plants in order to maintain homeostasis? Breathing Cell division Cellular respiration Photosynthesis

What is the percentage composition of soap (C12H35COON) ?

Which of the following pairs of elements are likely to form ionic compounds? Check all that apply. sodium and potassium nitrogen and iodine potassium and sulfur chlorine and bromine helium and oxygen magnesium and chlorine