What would have to happen for water vapor to disappear?

Two compounds are mixed and light is emitted, the color changes, and heat is liberated. Which activity has occurred? A. Chemical reaction B. Chemical mixture C. Chemical nucleus exchange D. Chemical compromise

Which of the following is an example of a mechanical wave? O A. A light ray B. A seismic wave C. A radio wave D. An X-ray

Which pure substance can be classified as an element? -H2 -NO3 -NaCl -H2SO4

Base your answer to this question on the information below. During a bread-making process, glucose is converted to ethanol and carbon dioxide, causing the bread dough to rise.

What 3 things must occur for a reaction to successfully take place

Identify each element as a metal, metalloid, or nonmetal. a. gold b. silicon c. manganese d. sulfur e. barium

Extreme (1, 2, or 3) in the center of nebulae causes hydrogen atoms to shed their electrons and collide with one another. The (4, 5, or 6) of the collisions cause the smaller, bare nuclei to fuse into large helium nuclei. 1. expansion 2. heat 3.

What type of change is a substance that changes form but remains the same?

How to generate crystal structure using wyckoff positions?

What is a Agricultural waste used as fuel is an example of a?