Which is the least dense?

1000 g of water

1000 g of feathers

1000 g of concrete

1000 g of mercury

What has a lot of support and is more than just a hunch in science?

Which is one way that waves erode coastlines?

Of the following reactions, which is a fission reaction? a. hydrogen-2 and hydrogen-3 combining to form a helium-4 atom and a neutron b. carbon-12 and hydrogen-1 combining to form a nitrogen-13 atom c.

What are the two types of pure substances

C. Neither a Physical or Chemical Changu D. Both a Physical and Chemical Change 2. If a substance changes color then what has occurred? A. Physical Change B. Chemical Change C. Either a Physical or Chemical Change D.

What ionic bond occurs between what particles? A. Two Negative Ions B. A positive and negative ion C. Two positive ions D. Two neutral atoms

Which of the following are good traits of a hypothesis? it will be able to be tested it can predict an outcome it will explain the observations all of these

What is the mass of a box of nails

In a phase change of water between the liquid and the gas phases, 770.1 kJ of energy was released by the system. What was the product, and how much of it was formed in the phase change? (dа ta: H₂O (l) → H₂O (g) ΔH = 44.01 kJ/mol.) A.

Explain the problem surrounding the ammonia-making process in terms of chemical equilibrium. Chemical equation for producing ammonia: N2 + 3H2 ⇌ 2NH3 + energy