Science TEKS 8.5A

Strontium phosphate, Sr₃(PO₄)₂ is a crystalline substance used in medicine and industry. How 42 many phosphorus atoms are represented in the formula for Sr₃(PO₄)₂?

• 2

• 3

• 4

• 8

Tags

NGSS.MS-PS1-1

Students in a science class prepared flashcards so that they could quiz one another about the arrangement of the periodic table. One of the flashcards contained information about two elements, Element L and Element M. The students had to use the information on the flashcard 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 flashcard?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?

• 72 protons, 178 neutrons, 106 electrons

• 72 protons, 106 neutrons, 72 electrons

• 178 protons, 250 neutrons, 72 electrons

• 106 protons, 72 neutrons, 106 electrons

Tags

NGSS.MS-PS1-1

The table shows the chemical formulas for four substances. Which substances have the same number of carbon atoms?

• Substances 1 and 2

• Substances 2, 3, and 4

• Substances 2 and 3 only

• Substances 1 and 3

Tags

NGSS.MS-PS1-1

Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans of food. Which statement accurately describes atoms of tin?

• Tin atoms have 50 protons.

• Tin atoms have five valence electrons.

• Tin atoms have 119 neutrons.

• Tin atoms have 68 electrons.

Tags

NGSS.MS-PS1-1

The chemical equation shown below represents a reaction that produces fuel for certain cars. Which substance represented in this equation is classified as an element?

• CO

• H₂O

• CO₂

• H₂

Tags

NGSS.MS-PS1-1

An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom?

• 36

• 84

• 48

• 72

Tags

NGSS.MS-PS1-1

All the following reactions are correctly balanced except—

• 2C₂H₂ + 5O₂ ---> 4CO₂ + 2H₂O

• 4Fe +3O₂ ---> 2Fe₂O₃

• NaHCO₃ ---> Na₂CO₃ + H₃O + CO₃

• 2CH₃OH + 3O₂ ---> 2CO₂ + 4H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the atomic number of oxygen?

• 5

• Sandwich

• 8

• 17

Tags

NGSS.MS-PS1-1

Who was Dimitri Ivanovich Mendeleev?

• Periodic table inventor

• Sandwich

• A singer

• An Astronomer

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5