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Chemistry

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Darron DuBuque

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Cards in this guide (8)
What is 20 plus 88

20 + 88 = 108

If a sample of gas occupies 20 ml at -132 C what volume does the sample occupy at 50 C

280 ml

Which of the following indicates that a chemical change has happened during cooking a The food darkens b Bubbles form in boiling water c Butter melts d Energy is transferred from the stove to a pan

the food darkens!

What is the formula for table surgar

C h o

12 22 11

Why does the density of a substance not change with the sample size

Density = mass / volume

As sample size increases, both mass and volume increase in the same ratio.

What is the percentage of a mixture homogeneous

A homogeneous mixture is 100% homogeneous.

What is a physical change strawberries left out to mold strawberries cooked into jelly Or strawberries liquefied in a blender
  1. mold: biochemical change as the fungus digests and eats the berries
  2. cooked: chemical change as heat triggers hydrolysis of proteins and starches in the berries
  3. blended: physical as blender blades chop the berries into puree
If the particles of matter that make up a substance are relatively far apart and can move freely the substance is in a state.

This is a gas.

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