Your teacher gives you an unknown substance: liquid x. you pour some of it into a dish, let it evaporate, and find a white residue in the dish. which of the following best describes liquid x? compound element mixture pure substance

Which of the following items represents a chemical change? burning melting evaporation freezing

Which of the following is the major regulator of oxygen consumption during oxidative phosphorylation? a. NADH b. NAD+ c. NADPH d. NADP+ e. ATP f. ADP g. O2 h. H20 i. CO2

Question 12 2 pts A gas is initially at STP. When heated to 25°C what will the pressure be in atmospheres assuming constant volume and moles?

What's the difference between Mixture and Solution?

Which best defines nitrogen fixation

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?

How can equilibrium of a closed system chemical reaction be disturbed? Select all that apply. Adding or removing products or reactants. Keeping the concentration of products and reactants the same. Keeping the temperature of the system constant.

Why does an exothermic reaction need activation energy?