Which of these is an example of a physical change

A breaking chemical bonds

B melting a substance

C nuclear decay

D forming chemical bonds

What state of matter is fire?

Which of the following is not true about the structure of an alveolus? A. It has thick walls to trap gases that enter during the breathing B. It has many capillaries running through its structure C.

To what class of minerals do gold, silver, and copper belong? A. carbonates B. native elements C. halides D. sulfates and sulfides

The element phosporus is located to the right of the element magnesium along the same period in the periodic table. Which best describes the relationship of the elements? Magnesium has a larger atomic number. Phosphorus has a larger atomic mass.

What is the number of moles of 7L of gas at 10 atm and held at a temperature of 298K?

Initially you dissolved all, or most, of the p-aminobenzoic acid in ethanol. then you slowly added sulfuric acid. as you did this, a large amount of white solid formed. during the course of the reaction, that white solid dissolved.

How do you know if a chemical reaction has occurred?

Why must a container or system be closed for equilibrium to be established?

What is the bond angle between the hydrogen atoms in an ammonia (NH₃) molecule?

In Experiment 1, the density of pure ethanol was found to be:Question 1 options:less than 0.793 g/mL. 0.793 g/mL. 0.999 g/mL. greater than 0.999 g/mL.