Which terms are used to identify pure substances?

(1) an element and a mixture

(2) an element and a compound

(3) a solution and a mixture

(4) a solution and a compound

How much energy is needed to heat a 35.5g sample of ice at - 17.5°C to liquid water at 77.3°C

How is current related to voltage in a circuit?

A scientist who wants to study the effects of fertilizer on plant growth sets up an experiment. Plant A gets no fertilizer, Plant B gets 5mg of fertilizer each day, and Plant C gets 10mg of fertilizer each day. What is the independent variable?

Which statement correctly describes the interaction between magnetic poles? North and south poles attract each other. North and south poles repel each other. Two north poles will attract each other. Two south poles will attract each other.

One side of a cube is 5 cm long. what is the cubes volume

N2 + 3h2 2nh3 how many moles of hydrogen are needed to completely react with two moles of nitrogen?

While in Europe, if you drive 119 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 30.0 mi/gal? Assume that 1euro=1.26dollars.

What type of star has an absolute brightness of 1 and a surface temperature around 7,500 °C?

Explain the difference between two types of elements with respect to the atoms

The ro - group is the nucleophile. think about which group in the alkyl halide (iodoethane) is the leaving group. keep in mind that the leaving group may be one atom or a group of atoms.