Answer:
The same 45.98 g of NaCl will be produced since 2 moles of Na will react with 2 moles of NaCl. Hence the stoichiometric coefficient will be in a ratio of 1:1
A hot summer day it could go up in flames. And on a cold day it expands.
Answer:
B. She can measure the volume and mass of the marble, the volume and mass of the water, and the mass of the empty graduated cylinder.
Answer:
C. solid iodine subliming into a gas
Explanation:
A physical change is a change that is reversible and can be reversed back into the original product. The atoms and molecules undergoes some rearrangement in the physical change. The process of change in the state of matters are placed under physical change. Solid iodine sublimes into purple gas on heating. The gas is then changed back to iodine crystals after being cooled. Hence, this is an example of a physical change.
Answer: B
Explanation:
K is +1 & S is -2 ==> K2S
Potassium sulfide is the inorganic compound with the formula K₂S. The colourless solid is rarely encountered, because it reacts readily with water, a reaction that affords potassium hydrosulfide and potassium hydroxide.