Science STAAR TEKS

Which information could a student determine from only the chemical formula of a protein?

• The color of the protein

• The number of molecules in each sequence that makes up a protein

• The physical arrangement of atoms in the structure of the protein

• The number of atoms of each element in the protein

Tags

NGSS.MS-PS1-1

A teacher asks a student to write the chemical equation for photosynthesis. The student’s response is shown below. The equation is not balanced correctly. Which of these is a balanced equation for photosynthesis?

• 
• 
• 
• 

Tags

NGSS.MS-LS1-6

NGSS.MS-PS1-5

When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?

• The total number of neutrons in the unknown element

• The total number of particles in the nuckleus of the unknown element

• The number of protons in the nucleus of the unknown element

• The number of valence electrons in the unknown wlwment

An atom has 25 protorn, 30 neutrons, and 25 electrons. What is the charge of the atom's nucleus?

• +25

• +30

• -25

• -30

How many atoms of oxygen are in a molecule of glucose (C₆H₁₂O₆)

• 6

• 12

• 24

• 3

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

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 is not very reactive

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

• The element is fluorine, and it is highly reactive

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

A model of an atom is shown. An atom of which element is represented by this model?

• Boron (B)

• Carbon (C)

• Neon (Ne)

• Sodium (Na)

Tags

NGSS.MS-PS1-1

All objects viewed from Earth have slightly longer wavelengths. Evidence suggest that all objects in the universe are

• moving away from each other.

• hotter than our Sun.

• older than our solar system.

• absorbing radiation from stars.

Tags

NGSS.HS-ESS1-2