How do you pass sience

In which way of the following situations would a spring scale be used? A) a study of the effect of different fertilizers on plant growth B) an investigation of the efficiency of different simple machines C) a measurement of the effect of a catalyst

Answer the lab question ("what is the effect of temperature on the solubility of a solid in a liquid?") with a hypothesis:

You have a solution of 75% zinc and 25% iron. Which is the solute and which is the solvent? (SPS6a; DOK2) a. zinc is solute; iron is solvent c. both are solvents b. zinc is solvent; iron is solute d. both are solutes

You construct a voltaic cell for the following chemical reaction: Tl3 + (aq) + 2Cr2 + (aq) → Tl + (aq) + 2Cr3 + (aq) The measured cell potential under standard conditions is + 1.19 V. Given that E°red for Cr3 + (aq) | Cr2 + (aq) is - 0.

Why is hydrogen bonding only possible with hydrogen? Hydrogen is the most electronegative element. Hydrogen's nucleus is electron deficient when it bonds with an electronegative atom Hydrogen tends to form covalent bonds.

At what temperature would the volume of a gas be 0.550 L if it had a volume of 0.432 L at - 20.0 o C?

A sample of a compound contains 9.11 g Ni and 5.89 g F. What is the empirical formula of this compound? A.) NiF B.) Ni3F2 C.) NiF2

Combining aqueous solutions of bai2 and na2so4 affords a precipitate of baso4. Which ions are spectator ions in the reaction?

Which kind of wave increases in height due to strong winds?

Solid lead IV oxide decomposes into solid lead and oxygen gas.