Science Chemistry

An irregularly shaped piece of gold was lowered into a graduated cylinder holding a volume of water equal to 17 ml. The height of the water rose to 20 ml. If the mass of the gold was 27 g, what was its density?

• 9 g/mL

• 10.5 g/mL

• 6.5 g/mL

• 8 g/mL

How many electron shells does the pictured atom have?

• 1

• 2

• 3

• 4

What is the atomic number of the atom pictured? 

• 9

• 10

• 18

• 19

Tags

NGSS.MS-PS1-1

Which of the following determines the identity of an element?

• number of protons

• atomic mass

• number of neutrons

• number of shells

The Periodic Table of Elements is most related to...

• Chemistry

• Geology

• Astronomy

• Biology

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the study of matter and how it changes?

• Biology

• Physics

• Chemistry

• Geology

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?

• The element is sodium, and it is highly reactive

• The element is fluorine, and it is highly reactive

• The element is sodium, and it is not very reactive

• The element is fluorine, and it is not very reactive

In this model, which particle determines the reactivity of this atom?

• Particle W

• Particle X

• Particle Y

• Particle Z

Tags

NGSS.MS-PS1-1

Elements in the same group or column have the same ...

• # of valence electrons and similar properties

• # of electron shells

• # of protons

• Mass Number

Which two elements have properties in common?

• Nitrogen and Phosphorous

• Oxygen and Nitrogen

• Sulfur and Nitrogen