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Questions and Answers

What happens when you burn fossil fuels?

Fossil fuels which are non-renewable produce energy and carbon dioxide when burned

Describe where you see nitrogen gas.

Nitrogen gas is very stable and is the most abundant in the earth's atmosphere.

What are the sources of carbon dioxide?

Cellular respiration, burning fossil fuels, volcanic eruption, and decomposition.

What is the difference between veins, arteries and capillaries?

<h1>Capillaries = Tiny vessels that connect arteries and veins•Have thin walls that allow blood to exchange substances with body tissue</h1> <p>Arteries = Carry deoxygenated blood and waste products back to the heart from organs•Have valves to prevent blood from flowing backward•Transport blood under lower pressure than arterie Veins = Carry oxygenated blood away from the heart to organs, have thick walls and are located deep in the muscles, transport blood under high pressure</p> Signup and view all the answers

What causes tumors and how does cancer spread?

<p>Caused by carcinogens, radiation and viruses. cancer spreads through a process called metastasis. (B)</p> Signup and view all the answers

Match the following phenomena:

<p>Mirage. = A virtual image that forms as a result of refraction and total internal reflection in Earth's atmosphere. Light rays coming down from the sky are refractedaway from the ground as they enter pockets of warmer air. The refracted rays totally internally reflect (rather than hitting the ground) and they enter our eye. Apparent depth = The depth at which an object appears to be due to the refraction of light in a transparent medium. It is a form of optical illusion. Objects under water always appear closer to the surface than they really are. Dispersion = When white light is passed through a glass prism and refracts into each individual colour (ROYGBIV). Shimmering = Caused by the light being refracted as it passes through air of different temperatures. This causes refraction of the light rays coming from the moon, which then enter into our eye.</p> Signup and view all the answers

What happens in a neutralization reaction?

<p>acid + base →salt + water (A)</p> Signup and view all the answers

Match the following:

<p>Triboluminescence = Light produced by the friction, rubbing, or scratching of crystals. Incandescence = Light produced by heating a thin wire (i.e: light bulb) Bioluminescence = Light produced by a living organism (i.e: firefly, jellyfish) Phosphorescence = Light produced by energy storage, which is then emitted slowly (i.e: glow-in-the-dark toys)</p> Signup and view all the answers

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