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Questions in chemistry

📝 Answered - Valuable ore deposits and gem crystals are often associated with: a. oceans b. oil deposits c. thin crustal areas d. igneous intrusions Which of the following shows a possible sequence that leads to the formation of sedimentary rocks? a. squeezing, heating, bending, folding b. rising, weathering, erosion c. weathering, deposition, compaction, cementation d. melting, cooling, crystallization

📝 Answered - Which idea that was once accepted is now considered scientifically inaccurate? A. The nucleus is the center of the atom B. An atom is solid material C. Electrons have a negative charge D. Electrons are arranged in layers

📝 Answered - Iron in the form of fine wire burns in oxygen to form iron (III) oxide. Write the balanced chemical equation.

📝 Answered - The landscape feature that forms when plate movement forces the crust to bend downward is a ______.

📝 Answered - Why might Earth's oceans be described as one huge ocean?

📝 Answered - In kilometers, how much larger is the distance around the Earth from east to west than the distance from north to south?

📝 Answered - A passenger walks toward the rear of a moving train. 1. Describe her motion from a reference point on the train. 2. Describe her motion from a reference point on the ground.

📝 Answered - Why is classification an important life skill?

📝 Answered - What is Neon’s group and period number?

📝 Answered - Perform the following calculations. Express the answers with the correct number of significant figures. a) \( 7 \, \text{g} - 3.5 \, \text{g} - 2.75 \, \text{g} = \) b) \( 200.00 \, \text{kg} - 199.0 \, \text{kg} = \) c) \( 25 \, \text{L} - 3.0 \, \text{L} = \) d) \( 0.67 \, \text{cm} + 2.0 \, \text{cm} + 0.090 \, \text{cm} = \) e) \( 104.5 \, \text{g} + 0.40 \, \text{g} = \)