Science STAAR Review Category 4

Which pair of properties describes the elements in Group 18?

• they are chemically stable and liquid at room temperature

• they have eight valence electrons and are flammable

• they are magnetic and boil at low temperatures

• they are gaseous at room temperature and chemically stable

Element R and Element Q have the same number of valence electrons. These elements both have similar chemical behavior, but Element R has fewer energy levels than Element Q. Which statement best describes the positions of the two elements in the periodic table?

• the two elements are in the same period, with element R the first element in the period and element Q the last element

• the two elements are side by side in the same period, with element Q to the left or element R

• the two elements are in the same group, with element R just above element Q

• the two elements are in the same group, with element Q at the top of the group and element R at the bottom

Tags

NGSS.MS-PS1-1

Students in a science class prepared flash cards so that they could quiz one another about the arrangement of the periodic table. One of the flash cards contained information about two elements, Element L and Element M.

The students had to use the information on the flash card to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in locations that match the information on the flash card?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

You know you a chemical reaction has occurred if 

• there is a precipitate.

• there is a color change.

• there is a temperature change.

• All of these answers are evidence.

Tags

NGSS.MS-PS1-2

In this image, the information to the RIGHT of the arrow (in BLACK) is called the_______.

• Product

• Reactant

• Chemical Subscript

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Read the following chemical formula: C₆H₁₂O₆. How many hydrogen atoms are in the formula?

• 12

• 6

• 4

Tags

NGSS.MS-PS1-1

What is the mass of sodium (Na) atom that has 11 neutrons? (Answer to the nearest whole number)

Mathematical Equivalence

ON

Which element does this model represent?

• Nitrogen

• Hydrogen

• Carbon

• Boron

Tags

NGSS.MS-PS1-1

The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed in the image.

Which of these elements is in this group:

• Lithium

• Strontium

• Aluminum

• Silicon

How many total atoms are in the compound C₂H₈O ?

• 11

• 2

• 8

• 1

Tags

NGSS.MS-PS1-1