If we have any substance, it can be concluded that a chemical change has happened if–

Which of the following would indicate the formation of a new substance?

Which of the following is an example of a physical change?

When two liquids are mixed, the container feels colder to the touch. This is evidence of what?

When two liquids are mixed, the color and temperature stay the same. This is evidence of what?

Which of the following is an example of chemical energy being converted into mechanical energy in the biosphere?

During digestion, which of the following energy conversions occurs?

A bird that eats seeds converts the energy stored in the seeds into the energy of its flight muscles. This conversion is from what kind of energy to what other kind of energy?

Green plants use sunlight to make their own food in the form of glucose. This process, known as photosynthesis, is an example of which of the following energy conversions?

Thermal energy is one of the forms of energy resulting from digestion which gets energy from food in the form of –

Site of water absorption from remaining undigested food to make feces.

Muscular sac-shaped bag where acid and enzymes digest food and kill bacteria. Muscles in the walls churn (contract) to promote mechanical (physical) digestion.

Teeth cut and grind food into smaller peices by chewing and saliva lubricates food and adds enzymes to start chemically changing food.

Tube connecting mouth to stomach.

Long tube wehre only chemical digestion occurs. Finger-like projections called villi are found here which allow for the absorption of nutrients into the capillaries of the bloodstream to be sent to the rest of the body.

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