Express the sum of 2222 km and 333 km using the correct number of significant digits.

a. 2500 km

b. 2550 km

c. 2550. km

d. 2555 km

If 455 J of heat is transferred to 25.0g of water at 45.0 degrees Celsius, what is the final temperature of the water?

The kw for water at 0 °c is 0.12 * 10-14 m2. calculate the ph of a neutral aqueous solution at 0 °c.

Which group of elements contains a metalloid? (1) Group 8 (3) Group 16 (2) Group 2 (4) Group 18

What was the atomic theory about?

Which of the following statements is true? A. Lithium will only react with metal ions that require the addition of one electron because of the fact that lithium only gives up one electron B.

Which organism is responsible for cleanup in this ecosystem? coyote vulture prairie dog grasshopper or prairie grass

What would happen if you tried to sqeeze a gas into a smaller container?

Paint, paint thinners and some cleaning agents can weaken the shell of a hard hat and may eliminate

A 10 chunk of metal has a specific heat of 0.25 J/g ºC. The temperature is changed from 10ºC to 45ºC. How much heat is required?

In this reaction what is the correct coefficient for sodium chloride? pb (no3) 2? nacl → pbcl2? nano3