physical vs chemical change lab

Is this a physical change or chemical change

Observations before: soda was a white powder, and the vinegar was a strong smelling liquid

Observations after: bubbles were fizzing, and gas was produced.

• physical, because they just mixed together, and the baking soda simply dissolved, which tells us the physical properties didn't change.

• Chemical, because the state of matter changed since a solid and liquid formed bubbles to produce a gas, and there isn't a strong smelling liquid either.

• Chemical, because the sound changed since new substance has the noise of fizzing, which is an indicator that a chemical change occurred.

• Physical, because the bubbles are produced from the new substance, but NOT actually part of the new substance.

Is this a physical or chemical change?

Observations Before: Phenolphthalein and Ammonia (2 clear liquids).

Observations After: Bright pink liquid.

• Chemical, because the substance has new atoms in it, since there was no pink substance before

• Physical, because the 2 clear liquids are being simply mixed together.

• Physical, because the texture, nor state of matter changed since it's still a liquid.

• Chemical, because the color has changed, which is an indicator that the atoms and molecules rearranged to form a new substance.

Is this a physical or chemical change?

Observations before: two clear liquids

Observations after: one foaming, cloudy, stringy substance

• Chemical, since the color changed from clear to white, and the texture changed from smooth to soft, which are indicators of a chemical change

• physical, because a clear liquid can be white, foamy, which means the liquids just mixed together.

• Chemical, because the state of matter changed from liquid to gas since it's foaming, which is the ONLY way a substance can change.

• Chemical, since the liquid was white which means it's flamable, because if you let the it sit out for a while, it would turn into candle wax.

Is this a physical or chemical change?

Observations before: Grey and shiny

Observations after: brown and orange

• Physical, because if the change is just color, the atoms and molecules didn't rearrange, which means no new substance has formed.

• Chemical, because the new brown and orange substance is darker, which is an indicator that a chemical change occurred.

• Chemical, because the color changed, which is an indicator that a chemical change occurred.

• Physical, because there brown and orange in the new substance, which means they haven't fully reacted with each other yet.

Is this a physical or chemical change?

Observations Before: Yellow and purple chalk pieces seperated

Observations after: chalks mixed together

Note: chalk was separated back to original colors at the end with tweezers and a magnifying glass

• Chemical, because the color changed when they were mixed together, which is an indicator that a chemical change occurred.

• Physical, because we were able to separate the chalk at the end, which tells us that this was just a mixture.

• Chemical, because the molecules could have broken apart, which means that they did rearrange to form new molecules.

• Physical, because each individual small piece of chalk looked the same before, during and after the expeirment.

Is this a physical or chemical change?

Observations before: clear water, and green food coloring

Observations after: Water turned green

• Chemical, because the color changed, which is an indicator that a chemical change occurred.

• Physical, because it's still a liquid, and change in state of matter is the only way a chemical change can occur.

• Chemical, because the size of the food coloring changed, when it mixed in with the clear water, since the water turned green.

• Physical, because if the water evaporates, then the green substance would remain, which tells us that it was just a mixture that occurred.

Is this a physical or chemical change?

Observations before: individual sugar crystals and a flame

Observations after: Bubbles formed, the sugar carmelized and turned brown, and there was a smell.

• Chemical, because the state of matter changed since the sugar formed bubbles, which means it's a gas.

• Chemical, because the sugar turned brown and caramelized, which changes the color, texture, and odor.

• Chemical, because new atoms are created, when sugar forms carmel, which is an indicator that a chemical change occurred.

• Physical, because the only thing that changed was the temperature of the sugar, since the flame just made it warmer.

Is this a physical or chemical change?

Observations before: small chunky pieces of salt and clear water

Observations after: A grey, cloudy liquid

• Chemical, because the color changed, which is an indicator that a chemical change occurred.

• Chemical, we can't really change it to the way it originally was, which tells us that when the water and salt combined, reactivity occurred.

• Physical, because the only thing that changed was the state of matter, since a solid and a liquid turned into a liquid

• Physical, because salt simply dissolved in water, and if the water evaporated, then the salt would be left behind, which tells us that the atoms didn't rearrange to form new molecules.