Temperature
When temperature increases it causes matter to expand or contract?
Expand - or take up more space
when changes occur- warm or hot will causes changes to occur faster or matter to expand more
When you cut a slice of bread into 2 pieces is this a chemical or physical change?
Physical Change- change of shape or size
What state of matter is water?
liquid
When we put the kool aid into room temperature water it dissolved. Would warming the water cause it to dissolve faster or slower?
faster- heat causes the atoms to move around faster and the moving atoms break down the powder faster.
When you gain weight or loose weight, is this a chemical or physical change?
what state of matter is a table?
solid
If I place sugar in water and place it in the freezer will it dissolve faster or slower than sugar in room temperature water?
slower - the atoms move slower and therefore dissolve slower
When I mix eggs and flour to create cookies is this a physical or chemical change?
Physical- it can be undone
what state of matter is a powder?
solid
When I place large objects in water will they dissolve faster or slower than smaller objects?
When I bake bread I use yeast and mix it with flour- I then place the yeast and flour mixture into the fridge- lowering the temperature and allowing the yeast to grow. Is this a chemical or physical change
This is a chemical change- yeast, when wet will give off a gas bi product - yeast gives off a gas and therefore it causes chemical changes
what state of matter is oxygen?
gas
When we made volcanos we used room temperature vinegar, and observed a chemical change, and concluded that vinegar and baking soda create a chemical change. In science we must 1st hypothesize, and the preform the experiment, and then preform it again without change. Why is this important
To make sure that our hypothesis is correct and that the experiment was accurate. Only after we try the experiment multiple times with the same result. Could we change the variables- such as temperature.
When I play with fireworks I must light the match and then the sulfur inside the fire work explodes- is this a chemical or physical change?
Chemical - it can not be undone the sulfur explodes and gives off a light and gas explosion
if I heat up a liquid what will it change to
a gas it will evaporate