15.5 grams of hydrogen gas (H2) reacts with 30.0 grams of oxygen gas (O2) to form water vapor (H2O). How many grams of water vapor will form?

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

*will mark you brainliest + 15 points ** why does the equilibrium of a system shift when the pressure is increased? a. to maximize the stress on the system b. to stop restoring equilibrium to the system c. to increase the total moles of gas in the system d. to decrease the total moles of gas in the system

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.