What is causing the change in the dry ice and the water ice? Describe what is happening at the molecular level to the substances (water and carbon dioxide) as they experience a phase change.

Which of the following statements about the relationship between science and technology is not true

How many molecules are in 2.34 mol H2O?

Ethylene C2H2 reacts with Oxygen according to the equation below. what volume of Oxygen (in dm3) reacts with 0.40 dm3 of C2H2? 2C2H2 (g) 5O2 (g) → 4 CO2 (g) 2H2O (g) ? (1) 0.4 (3) 0.80 (2) 1.0 (4) 2.0

What are the most chemically stable elements (in terms of reactivity) on the periodic table?

Match these items. 1. ethanol and benzoic acid butanyl butyrate 2. benzyl alcohol and acetic acid isopropyl formate ethyl benzoate 3. butyric acid and butanol 4. n-pentanol and propanoic acid 5.

In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction? 18 g 54 g 72 g 90 g

In the following combustion reaction, what is the mole ratio of diatomic oxygen to water?2 c2h6 7 o2 ( g. - - > 4 co2 6 h2o a. 6/7 b. 7/4 c. 7/6 d. 6/7

1. A cube has a mass of 40 grams. One side of the cube has a length of 3.4. What is the Density of the cube?

Which of the following is the trend down a period? A. The number of complete electron shells increases by one. B. The number of complete electron shells stays the same. C. The number of outer shell electrons decreases by one. D. None of these.

How does sugar affect the rate of cellular respiration in yeast?