Which substances are acids? check all that apply. 1; agoh 2; hf 3; niooh 4; nh4oh 5; hmno4 6; zn(oh)2

Only HF and HMnO₄ are acids and all others are base.

When the given substances are put in water, they break apart to give H⁺ or OH⁻ ions. Only HF and HMnO₄ will give H⁺ ions and others will give OH⁻ ions. It is these ions which give a substance its acidic or basic nature. All the substances that give H⁺ ions are acidic in nature. The others that give OH⁻ ions are basic in nature.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2