4 observations that suggest a chemical change is occurring

A chemical reaction has two elements as reactants. Which type of reaction might occur? synthesis decomposition single replacement double replacement

Which one of the following classes of organic compound does not contain the carbonyl (C=O) group? A) aldehydesB) carboxylic acidsC) ketonesD) alcoholsE) esters

What two elements do not need eight valence electrons to stay stable?

KNO3 (s) - -->ž K + (aq) + NO3 - (aq) This reaction was carried out in a Styrofoam insulated calorimeter and the following data were recorded:Mass of solid KNO3 dissolved10.1 gMass of aqueous solution (c = 4.18 J/gºC) 100. gT initial30.0ºCT final21.

Which molecule make up proteins?

A small 15 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?