Chemistry STAAR Review

Flashcard
•
Science
•
8th Grade
•
Hard
+1
Standards-aligned
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15 questions
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1.
FLASHCARD QUESTION
Front
How many valence electrons are in an atom of each element in Group 15 in the periodic table?
Back
5
2.
FLASHCARD QUESTION
Front
Based on atomic models, which element is the least reactive? Options: Neon, Chlorine, Gallium, Tin
Back
Neon, because it has two energy levels with eight electrons in the second level
Tags
NGSS.MS-PS1-1
3.
FLASHCARD QUESTION
Front
Which statement accurately describes the atoms of a specific element?
Back
A zinc‚ Zn‚ atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.
Tags
NGSS.MS-PS1-1
4.
FLASHCARD QUESTION
Front
Which chemical reaction involves the fewest oxygen atoms?
Back
Tags
NGSS.MS-PS1-1
NGSS.MS-PS1-2
NGSS.MS-PS1-5
5.
FLASHCARD QUESTION
Front
As part of an investigation, students combined substances in a beaker to observe chemical reactions. They performed two procedures. They measured the mass of each substance before and after each reaction. The table shows their observations. Assuming the students did not make any careless errors, what likely explains these changes in mass?
- Procedure 1: One of the products was a gas that escaped into the air. Procedure 2: A gas from the air reacted with one of the other reactants.
- Procedure 1: The reactants were liquids with different densities. Procedure 2: The reactants were combined into only one product.
- Procedure 1: One of the reactants was converted to thermal energy. Procedure 2: All the products were liquids.
- Procedure 1: All the reactants were liquids that evaporated. Procedure 2: A gas was formed as one product, and it escaped into the air.
Back
Procedure 1: One of the products was a gas that escaped into the air. Procedure 2: A gas from the air reacted with one of the other reactants.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
6.
FLASHCARD QUESTION
Front
Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, a nonmetal, or a metalloid. Which table was completed correctly?
Back
Tags
NGSS.MS-PS1-1
7.
FLASHCARD QUESTION
Front
Changes to food during digestion: Esophagus squeezes food into the stomach by wave-like muscle contractions. Peptidase enzymes in the small intestine break food molecules into smaller molecules.
Back
The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes.
Tags
NGSS.MS-LS1-7
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