5TH GRADE SCIENCE Listed below are the four phase changes. Which two phase changes occur when heat is lost?

A. Freezing
B. Evaporation
C. Condensation
D. Melting

Why does his teacher ask him to balance the equation by including the correct coefficient

For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate

Which fact represents evidence for the big bang theory?