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Questions in chemistry

📝 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) \( 104.5 \, \text{g} + 0.40 \, \text{g} = \)

📝 Answered - What causes climate change?

📝 Answered - Is \(\text{Ba(NO}_3)_2\) covalent or ionic?

📝 Answered - What are some advantages of using less farm machinery in planting?

📝 Answered - If water and ethanol both have all three intermolecular bonds, why does ethanol evaporate so much quicker?

📝 Answered - How is groundwater formed?

📝 Answered - Explain why ionic compounds are formed when a metal bonds with a nonmetal but covalent compounds are formed when two nonmetals bond.

📝 Answered - How is \(0.00025\) written in scientific notation?

📝 Answered - Why is a piece of apple rotting a chemical change?

📝 Answered - Name five kinds of landforms caused by plate movement.