Which two observations below can be evidence that a chemical change has occurred

A. Production of bubbles (a gas)

B. melting

C. vaporization

D. production of heat

What characteristic property did arrhenius attribute to acids and bases?

Which energy source is a nonrenewable resource?

How might the government make sure scientific research is done in an ethical way?

Which statement accurately describes renewable energy sources? Question 1 options: They are quickly replenished. They take millions of years to form and should be used responsibly. They include fossil fuels and hydroelectric power.

The larger the molecules of a substance, the the London forces between them. A larger molecule has more electrons and a greater of having its electron cloud distorted from its nonpolar shape.

In order to use the value 22.4 L for molar volume in a mass-volume or volume-mass stoichiometry problem, the gas must be assumed to be at STP. A. True B. False

The gravitational attraction between two objects would increase if both masses are

If the pH indicator bromothymol blue was added to the nitric acid solution, it's colour would be?

The specific heat of copper is 0.385 j/g°c which equation would you use

Which list includes three types of chemical formulas for organic compounds? 1. covalent, metallic, isotopic 2. covalent, metallic, molecular 3. empirical, structural, isotopic 4. empirical, structural, molecular