science reviewer.docx

**\#\#\# \*\*Mock Exam for Grade 6 Science\*\*** \-\-- \#\#\#\# \*\*Topic 1: Classification of Matter\*\* 1\. What are the two main types of matter? 2\. Is air considered a pure substance or a mixture? Explain. 3\. Which of the following is an example of a compound? a\) Oxygen (O₂) b\) Water...

**\#\#\# \*\*Mock Exam for Grade 6 Science\*\*** \-\-- \#\#\#\# \*\*Topic 1: Classification of Matter\*\* 1\. What are the two main types of matter? 2\. Is air considered a pure substance or a mixture? Explain. 3\. Which of the following is an example of a compound? a\) Oxygen (O₂) b\) Water (H₂O) c\) Iron (Fe) d\) Carbon (C) 4\. How do the molecules in a solid differ from the molecules in a gas? 5\. Classify the following as an element, compound, or mixture: a\) Gold (Au) b\) Saltwater c\) Carbon dioxide (CO₂) \-\-- \#\#\#\# \*\*Topic 2: Classification of Mixtures\*\* 1\. What is a mixture? Give one example. 2\. What is the difference between a homogeneous and heterogeneous mixture? 3\. Is milk a homogeneous or heterogeneous mixture? Explain. 4\. Which of the following is a heterogeneous mixture? a\) Saltwater b\) Oil and water c\) Vinegar d\) Sugar water 5\. Which of the following mixtures can be separated by filtration? a\) Muddy water b\) Vinegar c\) Salt dissolved in water d\) Sugar dissolved in tea \-\-- \#\#\#\# \*\*Topic 3: Solutions, Suspensions, and Colloids\*\* 1\. What is the main difference between a solution and a suspension? 2\. Is blood considered a solution, suspension, or colloid? 3\. Which of the following is a characteristic of a colloid? a\) Particles settle at the bottom b\) Particles are visible c\) Particles scatter light d\) Particles dissolve completely 4\. Which of the following is an example of a suspension? a\) Milk b\) Saltwater c\) Orange juice with pulp d\) Soda 5\. What type of mixture is fog? \-\-- \#\#\#\# \*\*Topic 4: Ways of Separating Homogeneous and Heterogeneous Mixtures\*\* 1\. Which separation technique would you use to separate sand from water? 2\. How can you separate salt from saltwater? 3\. What is the purpose of distillation? 4\. What is the best way to separate iron filings from sand? 5\. Which of the following can be used to separate mixtures based on particle size? a\) Filtration b\) Evaporation c\) Magnetism d\) Decanting \-\-- \#\#\#\# \*\*Topic 5: Skeletal System\*\* 1\. How many bones are in the human body? 2\. What is the function of the skeletal system? 3\. Which of the following is not a type of bone? a\) Long bones b\) Short bones c\) Flat bones d\) Round bones 4\. What connects bones to muscles? 5\. Where is the femur located? \-\-- \#\#\#\# \*\*Topic 6: Muscular System\*\* 1\. What is the main function of the muscular system? 2\. How do muscles work in pairs? 3\. Which of the following is an involuntary muscle? a\) Skeletal muscle b\) Smooth muscle c\) Cardiac muscle d\) All of the above 4\. What is the difference between voluntary and involuntary muscles? 5\. What type of muscle makes up the heart? \-\-- \#\#\#\# \*\*Topic 7: Integumentary System\*\* 1\. What is the largest organ in the human body? 2\. Name the three main layers of the skin. 3\. What is the function of melanin in the skin? 4\. How does the integumentary system protect the body from infections? 5\. What part of the integumentary system helps regulate body temperature? \-\-- **\#\#\# \*\*Answer Key (Separate Page)\*\*** \-\-- \#\#\#\# \*\*Topic 1: Classification of Matter\*\* 1\. Pure substances and mixtures. 2\. Air is a mixture because it contains different gases. 3\. b) Water (H₂O) 4\. In a solid, molecules are tightly packed and vibrate in place; in a gas, molecules move freely and are far apart. 5. a\) Element b\) Mixture c\) Compound \-\-- \#\#\#\# \*\*Topic 2: Classification of Mixtures\*\* 1\. A mixture is a combination of two or more substances that are not chemically combined. Example: salad. 2\. Homogeneous mixtures have uniform composition throughout, while heterogeneous mixtures do not. 3\. Milk is a colloid (homogeneous mixture) because its components are evenly distributed. 4\. b) Oil and water 5\. a) Muddy water \-\-- \#\#\#\# \*\*Topic 3: Solutions, Suspensions, and Colloids\*\* 1\. In a solution, particles are fully dissolved, while in a suspension, particles are large and settle out. 2\. Blood is a colloid. 3\. c) Particles scatter light 4\. c) Orange juice with pulp 5\. Fog is a colloid. \-\-- \#\#\#\# \*\*Topic 4: Ways of Separating Homogeneous and Heterogeneous Mixtures\*\* 1\. Filtration 2\. Evaporation 3\. To separate liquids based on their boiling points. 4\. Magnetism 5\. a) Filtration \-\-- \#\#\#\# \*\*Topic 5: Skeletal System\*\* 1\. 206 bones 2\. To support the body, protect organs, and allow movement. 3\. d) Round bones 4\. Tendons 5\. In the upper leg (thigh bone). \-\-- \#\#\#\# \*\*Topic 6: Muscular System\*\* 1\. To help the body move. 2\. Muscles work in pairs; when one contracts, the other relaxes. 3\. c) Cardiac muscle 4\. Voluntary muscles are controlled by the person (like skeletal muscles), while involuntary muscles work automatically (like heart and digestive muscles). 5\. Cardiac muscle \-\-- \#\#\#\# \*\*Topic 7: Integumentary System\*\* 1\. Skin 2\. Epidermis, dermis, hypodermis. 3\. Melanin protects the skin from UV rays. 4\. The skin acts as a barrier to pathogens and produces oils that can kill bacteria. 5\. Sweat glands (which are part of the skin).