question 4 .Which process is a physical change?

A.burning coal


cooking an egg


melting ice


rusting iron

If you break a piece of glass, the shape of the glass changes, but the properties in the fragments remain the same. Which of the following has occurred?

Question 6 options:

A.a chemical change


a temperature change


a phase change


a physical change
A substance made up of two or more elements that have been chemically combined is called

Question 9

A.an element


a mixture


a compound


an atom

Of the three ordinary states of matter, gas is the only state that



A.has a definite shape


has mass


is highly compressible


is fluid
In which state of matter do the particles have the most energy?

A.solid


gas


liquid

Elements in group 18 called Noble Gases are highly reactive because they have 1 valence electron.

Question 12 options:
True
False

Atomic mass is the sum of

Question 13 options:

neutrons and protons


protons and neutrons


metalloids and metals


protons and electrons

The current model of the atom is known as

Question 14 options:

Rutherford's model


Bohr model


Quantum mechanical (electron cloud) model


planetary model

Most elements on the periodic table are

Question 15 options:

non-metals


metalloids


gases


metals

Which is not a quality of a non-metal?

Question 16 options:

shiny


not malleable


gas at room temperature


poor conductors