Alice added sodium chloride to water and stirred the water for several minutes. Alice is most likely trying to demonstrate that ionic compounds 1. are hard 2. can dissolve 3. are clear 4. can melt

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?