Could you help and check? Please?
Maria and Miquel were enjoying the fireworks when they got into a chemistry argument. Maria insisted that the fireworks were the result of a chemical reaction. Miguel disagreed. What would you tell them to solve this argument.
A) It is a change of state, solid to gas, due to the addition of energy.
B) The color changes and the release of energy indicate a chemical reaction.
C) Because the fuse were lit and energy is added, it is a physical reaction.
D) It is an endothermic reaction because energy was added; therefore it is a chemical reaction,
Molecules are different from atoms because they...
A) have less energy.
B) are much smaller. <<i dont think this one is right
C) have unique properties.
D) contain chemical bonds.<<<<<i think its this one
A student takes four samples of a silver, metallic solid and and subjects each piece to different treatment.
Piece 1: The solid is hammered into a flat sheet.
Piece 2: The solid is heated in a flame until it melts.
Piece 3: The solid fizzes when acid is dropped on the surface.
Piece 4: The solid is place in a beaker of water and it floats.
Which piece, when treated, indicates a chemical change?
A) piece 1
B) piece 2
C) piece 3 <<<<<<<this one is it, right?
D) piece 4
The Venn diagram describes a phase change from solid to gas phase between the areas marked. (pic 1) Answer: C?
A + B → C + D
If there are 4 grams of product produced by the chemical reaction, how many grams of reactant were consumed? Answer: its 4, right?
Summarize the Venn diagram. (pic 2)
A) Compounds are found inside the matter of atoms. <<<<<i think its this one
B) A pure substance may contain subatomic particles but not atoms.
C) Compounds are the most basic form of matter. They combine to form larger atoms.
D) Atoms are the most basic form of matter. They combine to form larger electrically stable compounds.