Is gasoline evaporated a chemical change

1. Salts consist of atomic particles that have an (blank) charge. fill in the blank 2. The metallic atoms have a positive charge, while the nonmetallic atoms have a (blank) charge.

How many moles of potassium chloride are in 28 grams of KCl? A.).265 mole KCl B.).856 mole KCl C.).376 mole of KCl (think it's this but idk) D.) 1.2 mole KCl

2,3,3,-3 Tetrafluoropropene (HFO-1234yf) is a popular hydrofluoroolefin with the molecular formula C4H2F4. What's the molar mass of this gas?!

Some properties of liquid water are very different from those of solid water (ice). Explain why freezing is considered a physical change, even though the properties of water change when it freezes.

Is there a relationship between an elements atomic number and its first ionization energy (IE) ?

If increase the amplitude how does the velocity change? (No google)

What is the result of multiplying (2.5 * 1010) * (3.5 * 10-7) ? Use the correct number of significant digits.

What is 0.002353 to two significant figures

10. Is the identity of an element determined by its mass number or atomic number? By omak

Nitric acid, hno3, dissociates in water to form nitrate ions and hydronium ions. what change in hybridization of the nitrogen atom occurs in this dissociation