Which of these is NOT a physical change?

A.

Candle burning.

B.

Evaporation of water.

C.

Magnetisation of iron.

What is conserved during a chemical reaction? A. mass, only B. charge, only C. both mass and charge D. neither mass nor charge

Is mint chocolate chip ice cream an element or compound

Elemental calcium reacts with water at room temperature to form calcium hydroxide and hydrogen gas as shown in this equation. Sodium undergoes a similar reaction with H2O. What would be the coefficient for sodium in a similar reaction?

Which applies to the collision theory? A. Particles need to collide in order to react. B. Particles may obtain successful collisions in any molecular orientation. C. Temperature increase causes kinetic energy of particles to decrease. D.

What are steroids that Aid in the development of muscles called

Before a race, an athlete warms up by jogging around the track shown below at a constant rate of 2.3 m/s. What statement best describes his motion as he jogs around the curved part of the track?

What physical property is changed when a waitress pours coffee from a pot into four mugs? temperature density volume color

Calcule o calor especifico do estanho sabendo que foram necessarias 100 cal para elevar em 20ºC a temperatura de 100 g de estanho

What's the smallest part of a compound

The inertness of the noble gases is due to a. the outermost shell has six electrons. b. the bonds they form with other elements. c. the number of protons and neutrons. d.