Science STAAR Review (6, 7 and 8)

What is the mass number of a potassium (K) atom that has 20 neutrons?

Many processes occur in the digestive system. Which process best classifies a physical change?

Which of the following describes a hydra bud? (Hydra is an animal that reproduces asexually)

When a lion eats a zebra & then uses the energy from the zebra to run, the lion's body converts

Based on these observations, which sample is most likely a nonmetal?

A student walks 2 km in 30 min. What is the student's average speed in km/h?

An atom of which element is represented by this model?

A mineral sample has a mass of 14.7g & a volume of 2.2 cm3. What is the density of that sample?

Where would an element be that is a pale-yellow brittle solid and does not conduct electricity?

Which substance most likely caused a new substance to be formed when mixed with water?

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

What types of particles are found in the cloud surrounding the atom's nucleus?

Which substance represented in this equation is classified as an element?

Which structure is only found in plant cells and helps plants capture energy from sunlight?

Which of the following best describes an electron?

Which of the following situations shows work being done?

Which ecosystem would be more likely to survive if a disease killed the grasses?

What energy transformations occur when propane gas is used to lift the balloon?

Which will most likely occur first when observing ecological succession in an empty garden?

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

Which of these statements could be represented by the graph?

Farmers want to increase milk made by cows. How can farmers use selective breeding to do this?

In which kingdom should this organism be classified?

What is one disadvantage of asexual reproduction in a species?

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

What property of an element determines if other elements react with it?

Hay is made up of organic compounds. What are the main elements in many organic compounds?

The chemical formula for sodium sulfate is NA₂SO_4. How many sulfur atoms are in the formula?

At which point does the ball have both the greatest kinetic energy and least potential energy?

Based on its chemical formula, which of the following substances is an organic compound?

What characteristic of calcium is most closely related to its chemical reactivity?

Based on the dichotomous key, which type of tree is this a sample from?