Category 1 Reteach

Which characteristic of an atom is NOT used to determine the number of neutrons in an atom?

• Protons

• Atomic number

• Atomic mass

• Electric charge

How many hydrogen atoms are in one molecule of camphor? C₁₀H₁₆O

• 16

• 10

• 26

• 27

Which model has properties most similar to chlorine?

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Two students complete a lab using two unknown substances in a chemical reaction. Which sign is NOT an indication of a chemical reaction?

• Shape change

• Bubbles

• Temperature change

• Odor change

After researching the local community, a student diagrams a simple food web.

• A grasshopper is prey for the mouse, snake and bird

• A snake feeds on a mouse and grasses

• A mouse eats both grasshopper and grasses

• A mouse and grasshopper sometimes provide food for the bird

The pictures show several objects made of copper. Copper can be shaped into various forms due to a physical property called —

• luster

• malleability

• reactivity

• conductivity

Which example describes a chemical change that occurs during the digestion of food?

• Saliva breaking down the starch in potatoes into simpler sugars

• Teeth grinding cookie into smaller pieces

• Esophagus moving food particles from the mouth to the stomach

• Large intestine absorbing water from waste to be removed from the body

A student finds that the mass of an unknown metal is 11.9 grams and the volume is 7 cm³. What is the density of the unknown metal AND what is the identity of the unknown metal the student is measuring?

Potassium hydroxide, KOH, reacts with hydrochloric acid, HCl, to form a salt and water. What mass of hydrochloric acid, to the nearest hundredth of a gram, is required for this chemical reaction?

(a)  

What is the best description of a molecule of glucose?

• Six atoms of carbon, twelve elements of hydrogen and six atoms of oxygen

• Six molecules of carbon, twelve molecules of hydrogen, and six molecules of oxygen

• Six atoms of carbon, twelve atoms of hydrogen, and six atoms of oxygen

• One atom of carbon, one atom of hydrogen, and one atom of oxygen