Classify the chemical equations as being balanced or not balanced.

CaO + 3C → CaC2 + CO

Na + H2O → 2NaOH + H2

4Fe + O2 → 2Fe2O3

2Mg + O2 → 2MgO

The rate at which charge flows through a circuit is

The planet jupiter revolves around the sun in a period of about 12 years (3.79 * 108 seconds). what is its mean distance from the center of the sun? the mass of the sun is 1.99 * 1030 kilograms.

How much do a steel BB weight?

What difficulties have slowed efforts to conduct controlled fusion reaction?

If element X has 31 protons, how many electrons does it have?

Which statements correctly describe the properties of heat? Select all that apply. Heat is an essential component of life on Earth. Heat is energy that flows from one object to another. Heat flows from a hotter object to a colder one.

A book is sitting on a table at rest. Which of the following best describes the forces acting on the book? A.

When NASA's Skylab reentered the Earth's atmosphere on July 11, 1979, it broke into a myriad of pieces. One of the largest fragments was a 1770-kg lead-lined film vault, and it landed with an estimated speed of 120 m/s.?

A spring gains 2.34 joules of elastic potential energy as it is compressed 0.250 meter from its equilibrium position. What is the spring constant of this spring? (1) 9.36 N/m (3) 37.4 N/m (2) 18.7 N/m (4) 74.9 N/m

Form hypothesis: Where do you think we humans get energy?