STAAR Category 1 and 2

The chart shows properties of four elements. Based on these properties, which element is most likely a nonmetal?

• Element 1

• Element 2

• Element 3

• Element 4

Tags

NGSS.MS-PS1-1

Sodium and lithium have similar chemical properties. What characteristic of these elements explains why they are chemically similar?

• Their atoms both have one valence electron.

• Their atoms both have more neutrons than protons.

• Their atoms have the same number of energy levels.

• Their atoms contain equal numbers of protons and electrons.

The diagram shows a model of an atom. The model contains three different subatomic particles. Particles X and Y are inside the nucleus, and particle Z is outside of the nucleus. Which statements best describe the charges on the particles in this model?

• Both particles X and Y have a positive charge.

  Particle Z has a negative charge.

• Both particles X and Y have a negative charge.

  Particle Z has a positive charge.

• Either particle X or particle Y has a positive charge.

  Particle Z has a negative charge.

• Either particle X or particle Y has a negative charge.

  Particle Z has a positive charge.

Tags

NGSS.MS-PS1-1

Which of these observations is an indication that a chemical

reaction has occurred?

• Steam forms above boiling water.

• A solid forms when a clear solution is frozen.

• A solid forms when two clear solutions are mixed.

• Sugar crystals form on the sides of a boiling pot of sugar water.

Tags

NGSS.MS-PS1-2

A student prepared diagrams to model atoms of two elements. Atoms of which two elements are represented by these models?

• Oxygen‚ O, and Neon, Ne

• Fluorine, F, and Neon, Ne

• Silicon, Si, and Phosphorus, P

• Beryllium, Be, and Boron, B

Tags

NGSS.MS-PS1-1

If a Fluorine atom has a mass number of 19, how many neutrons

are in the atom?

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, nonmetal or metalloid. Which table was completed correctly?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

Students were asked to identify the location of elements in the periodic table based on clues printed on game cards. Based on the data, which periodic table shows the correct location of the four elements?

*the answer choices (F, G, H & J) are the same in the question image and the answer choice images...trying to make it so you can zoom in to see the answers!

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Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

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

Which statement correctly describes the location and charge of the neutrons in an atom?

• The neutrons are inside the nucleus and have a positive charge.

• The neutrons are outside the nucleus and have a neutral charge.

• The neutrons are outside the nucleus and have a negative charge.

• The neutrons are inside the nucleus and have a neutral charge.