Hich of the following equations is balanced correctly?

A.

2 C2H2 + 5 O2 → 4 CO2 + 2 H2O

B.

3 H2O → H2 + 3 O2

C.

2 C3H3 + O2 → 2 CO2 + H2O

D.

Cl2 + 2 KBr → KCl + Br2

The free body diagram below represents Silly Sally hanging from a trapeze bar. Sally weighs 1,000 Newtons. What is the force in each of the chains holding the trapeze bar? A) 1,000 N B) 9,800 N C) 500 N D) 10.41 N

In addition to average weather conditions, climatological data also describes annual variations and fluctuations of temperature, precipitation, __, and other variables. A. cloud height B. wind speed C. ocean temperatures D. soil moisture

Sodium = Na Water = H2O Gold = Au Silicone = Si Boron = ? What is the symbol for Boron?

1. Some wooden rulers do not start with 0 at the edge, but have it set on a few millimeters. How could this improve the accuracy of the ruler? 2. You find a micrometer that has been badly bent.

Why do we classify elements

Is electric charge a property of just electricity or is charge a property of all atoms?

Which of the gases found in the Earth's atmosphere is an important factor for weather conditions? A) oxygen B) hydrogen C) nitrogen D) water vapor

How do repeater stations improve the quality of a broadcast?

What is the total number of atoms in the following formula? CaBr2 04

The Amazon River is in Europe. True or False