Free Printable Chemistry STAAR Review Category 1 JH

Worksheets

Chemistry STAAR Review Category 1 JH

Total questions: 22

Worksheet time: 18mins

Name

Class

Date

Calculate the number of Oxygen atoms in Al(OH)₃

How many total POTASSIUM atoms are in this formula?

How many total atoms are in (NH₄)₂CrO₄?

Determined whether the following equation is balanced or unbalanced. Ag + O_{2 --->}2Ag₂O

Balanced

Unbalanced

Determine whether the following equations is balanced or unbalanced. H₄+ O₂---> 2H₂O

Balanced

Unbalanced

How many elements are in this chemical formula? $NaHCO_3$

Identify the Product (s) 2H₂O₂ -> 2 H₂O + O₂

2H₂O₂

2H₂O and O₂

A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -

could show that a gas is forming

always rise to the top of a liquid.

are almost always perfectly spherical.

usually burst after a few minutes.

Hydrogen peroxide breaks down to form water and oxygen gas. Which observation is evidence that a chemical reaction has occurred?

The mass of the solution remains the same.

Phase changes are observed.

The color of the solution remains clear.

The temperature of the solution increases.

10.

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?

A dark solid formed on the zinc metal.

The zinc metal remained silver-colored and shiny

The CuSO₄solution turned blue when the zinc metal was added.

None of these

11.

Which element has 3 protons, 4 neutrons, and 3 electrons? (write the name with the first letter capitalized)

(a)

12.

Which element has 5 valence electrons and 2 energy shells? (write the name with the first letter capitalized)

(a)

13.

Which element is in period 6 and group 4? (write the name with the first letter capitalized)

(a)

14.

Which element has similar properties and reactivity (same # of Valence electrons) as Bromine, but has fewer protons?

Flourine

Krypton

Arsenic

Iodine

15.

Based on the data collected, which table shows the correct location of the four elements?

16.

Which of the following is a physical change?

Baking cookies

Rust forming on a bike

Sharpening a pencil

Hydrogen and oxygen creating water.

17.

What is the law of conservation of mass?

Mass cannot be created nor destroyed in a chemical reaction.

Mass can be created but not destroyed in a chemical reaction.

Mass can be destroyed but not created in a chemical reaction.

Mass can be created and/or destroyed in a chemical reaction.

18.

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.

19.

How many neutrons are in magnesium?

20.

What is the atomic number of silicon?

21.

How many electrons are in Potassium

22.

What element is represented in this Bohr Model?

Carbon

Hydrogen

Aluminum

Lithium

100 %

Chemistry STAAR Review Category 1 JH

Total questions: 22

Worksheet time: 18mins

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