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I need ur help on 2.03 in science

I got 100%.

Explanation:

Observations Before Interaction

Example: Sugar + Heat-

The sugar is in tiny white particles in a pile. Heat is not seen but is implied by the heat source. The pile of sugar in the pot has a mass of 100 grams.

Observations After Interaction

Example: Sugar + Heat-      

There is a solid, light brown mass at the bottom of the pot. It has a mass of 100 grams.

How was mass conserved?

Example: Sugar + Heat-      

The mass of the sugar is the same in melted form as it is in solid crystal form.

Proof of a Chemical Reaction

Example: Sugar + Heat-

There was not a chemical reaction. Sugar did not change the composition. It only melted. Melting point is a physical property, and this is a physical change.

Observations Before Interaction

Steel Wool + Oxygen (Fire)-

The steel wool is bundled and has a dark color to it. The oxygen is captured in a blue tank so you couldn’t “see” the oxygen color. There are 6 grams of steel wool and 1 gram of oxygen (excluding the tank).

Observations After Interaction

Steel Wool + Oxygen (Fire)-

There is a powder, colored reddish-brown. It has a mass of 7 grams.

How was mass conserved?

Steel Wool + Oxygen (Fire)-

The mass of steel wool and oxygen were both the same in the combined form if you add their grams together.

Proof of a Chemical Reaction

Steel Wool + Oxygen (Fire)-

There was a chemical change reaction. The steel wool rusted and rust is a chemical change.

Observations Before Interaction

Egg + Heat-

The eggshell is brown but once you crack it open the yolk is yellow and the slimy part is transparent. It weighs 45 grams with the shell. The fire is red and hot but it is not weighed.

Observations After Interaction

Egg + Heat-

The egg is cooked on both sides so the egg wouldn’t be that slimy texture but would be hard. The mass of the cooked egg would be 41 and the shell is 4 grams.

How was mass conserved?

Egg + Heat-

The mass of the egg is the same mass as the cooked egg with its empty eggshell.

Proof of a Chemical Reaction

Egg + Heat-

It is a chemical reaction because the egg can’t be turned into that slimy texture, it is irreversible.

Observations Before Interaction

Water + Heat-

The water is a transparent “color”. It is liquid so it could take in any shape of its containment. The heat is hot but is transparent as well.

Observations After Interaction

Water + Heat-

The water and heat made a water vaper kind of like fog.

How was mass conserved?

Water + Heat-

The mass of the water (75 grams) is the same amount of mass as the steam (75 grams)

Proof of a Chemical Reaction

Water + Heat-

There is no chemical reaction because you change water vapor back into the water.

Observations Before Interaction

Zinc + Hydrogen Chloride-

The zinc is a light brown color and its shape in clumps. The hydrogen looks like a blue transparent liquid. The zinc is measured as 10 grams and the hydrogen is weighed to be 5 grams.

Observations After Interaction

Zinc + Hydrogen Chloride-

The zinc dissolved in the hydrogen chloride (but there is still some zinc left) then it released some hydrogen gas.

How was mass conserved?

Zinc + Hydrogen Chloride-

Although the new combination is 12 grams and not 15 the gas that was released as 3 grams would have made 15 grams. (since 3 + 12= 15)

Proof of a Chemical Reaction

Zinc + Hydrogen Chloride-

In chemical changes, if you combined two things You can’t change it back because it is chemically fused together. Therefore dissolving the zinc into the chloride can’t be changed back.  

Observations Before Interaction

Sodium Hydroxide + Copper Sulfate-

The sodium hydroxide is a transparent liquid and weighs 10 grams. The copper sulfate is also a transparent liquid but is colored blue and weighs 57 grams.

Observations After Interaction

Sodium Hydroxide + Copper Sulfate-

When the solutions were mixed it made a pale blue liquid and has a mass of 67 grams. (Sodium Sulfate 47 grams + Copper Hydroxide 20 grams= 67)

How was mass conserved?

Sodium Hydroxide + Copper Sulfate-

The mass of both sodium hydroxide (10 grams) and copper (57 grams) both equal to the new solutions which are 67 grams. (Sodium Sulfate 47 grams + Copper Hydroxide 20 grams= 67)

Proof of a Chemical Reaction

Sodium Hydroxide + Copper Sulfate-

When two solutions are mixed together it would mean you can’t separate them back especially when they are liquids.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates