Select the equations that are correctly balanced.

a. H2O + 2O2 → H2O2

b. Fe2O3 + 3H2 → 2Fe + 3H2O

c. Al + 3Br2 → AlBr3

d. CaCO3 → CaO + CO2

The highest temperature recorded in the same city during the past year was 304.89 K. What was the temperature in degrees Celsius?

How many km/hr is 30 m/s?

A voltaic cell converts chemical energy to A) electrical energy with an external power source B) nuclear energy with an external power source C) electrical energy without an external power source D) nuclear energy without an external power source

How many moles are in 65 g of carbon dioxide (CO2) ?

The heat of combustion of butane, c4h10, is 2874 kj/mol. what is the heat of combustion of butane, in kj per gram? (provide the right sig. fig)

He substance, cocl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

The weighted average atomic mass of an element depends upon the a. relative abundance of protons in the element b. mass and relative abundance of each isotope of that element c. mass and relative abundance of each neutron of that element d.

What part of an atom do we change for isotopes

The Safe Drinking Water Act (SDWA) sets a limit for mercury-a toxin to the central nervous system-at 0.002 mg/L. Water suppliers must periodically test their water to ensure that mercury levels do not exceed 0.002 mg/L.

The smallest unit of an element is a blank