Why is hydrogen placed above the alkali metals, on the periodic table?

Which is an example of a chemical change? a. mixing of poster colors b. formation of clouds c. metal corroding in salt water d. sugar dissolving in water e. separating salt from seawater

What are the two characteristics of air mass

How did rutherford know that the nucleus was positively charged?

The wavelength of a light wave can be used to measure which of the following

When water cools from 10 °C and then freezes to become ice, which of the following best describes describe the heat flow between the system and surroundings? A) The energy of the universe is decreasing because the water is cold.

Sara and Sam went for a two-hour drive. According to the graph, between. 75 hours and 1.25 hours into their trip, they A) slowed down to a speed of 15km/hour. B) travelled at a constant rate of 30km/hour.

Define the following terms: acids, bases, oxoacids, oxoanions, and hydrates.

Calculate the concentration of a solution that has 6.7 moles in a volume of 0.6 liters.

Is sidewalk cement an element or a compound?

1.4 Explain why it is important to support individuals to challenge information about services that may present a barrier to participation