Predict what the Co, levels will be when you are "old". How many plants/trees need to be planted now to keep carbon dioxide in the atmosphere at its current level or lower?

Choose all the answers that apply. Calcium (Ca) has two electrons in its outermost shell. Calcium: is a metal is a nonmetal fills its shell by giving up two electrons fills its shell by gaining six electrons becomes a negatively charged ion becomes

After reaching equilibrium, the rate of formation of products is less than the rate of formation of reactants. After reaching equilibrium, the rate of forming products and reactants is the same. Equilibrium is obtained prior to Te.

Which salt is produced when H2SO4 reacts with NaOH?

When 13.0 g of a hydrocarbon are burned in excess O2, 9.0 g of H2O are formed. What is the formula of the hydrocarbon?

Which is a pure substance? A) Trail mix B) Table salt C) Salt water D) Pasta salad

Which outcome is not caused by gravitational force?

Explain the properties of the substance around us depend on the atoms and molecules that compose them

What is an ion (1 mark) what is the charge on a chloride ion (1 mark) what is an ionic bond (1 mark)

Why do northern lights appear in different colors? Because charged particles of solar wind ignite different gases in Earth's atmosphere Because electrons and protons of solar wind ignite the plasma present in the corona Because electrons and protons

Which organ system consists of the following levels of organization? kidney cells - - > kidney tissues - - > kidney A. excretory B. circulatory C. respiratory D. integumentary