Classify the chemical equations as being balanced or not balanced.

CaO + 3C → CaC2 + CO

Na + H2O → 2NaOH + H2

4Fe + O2 → 2Fe2O3

2Mg + O2 → 2MgO

An organism's scientific name consists of a. its class name and its family name. b. its kingdom name and its phylum name. c. its genus name and its species name. d. its phylum name and its species name.

Protons are made up of ___ up quark (s) and ___ down quark (s). a. 1, 1 b. 1, 2 c. 2, 1 d. 2, 2

What is the voltage drop through a resistor of 6 ohms (2 amps) ?

Two frictionless blocks, having masses of 8.0 kg and 1.0 kg, rest on a horizontal surface. if a force applied to the 8.0 kg block gives it an acceleration of 5.0m/s2, then the same force will give the 1.0 kg block an acceleration (in m/s2 of

It takes 3 minutes to make toast in a 1500 watt toaster. Calculate how much work is done by the toaster. A) 8.3 J B) 60 J C) 90,000 J D) 270,000 J

When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 45.0

An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the acceleration? 4 m/s2 in negative acceleration 4 m/s2 in positive acceleration 9 m/s2 in positive acceleration 9 m/s2 in negative acceleration

Two students walk in the same direction along a straight path at a constant speed-one at 0.90 m/s and the other at 1.90 m/s. •How far would the students have to walk so that the faster student arrives 5.50 min before the slower student? A.) 460s B.

During the process of accretion, each planet-in-the-making, or proto-planet, grew in size and mass. The amount of gravity for the proto-planets is best represented by which graph?

Theories and Laws. • How are they alike? • How are they different? • Can you explain why scientific theories will change over time? • Give an example of a scientific theory that has changed.