Chemistry

Does a change in energy always indicate that a chemical reaction has taken place? Explain. No, a change in energy does not always indicate a chemical reaction has taken place.

What kind of fat forms as a result of hydrogenation? monounsaturated saturated trans cholesterol

Use the chemicals written below to answer questions 13-16. They may be used more than once. A H_2O K+ E B C_6H_12O_6 F N_2 C NH_3- G CO_2 D O_2 13 Which of the above is/are molecule/s? 2pts _ 14 Which of the above is/are compound/s? 2 pts _ 15 Which of the above is/are ion/s? 2pts _ 16 Which of the above is/are organic compound/s? 2pts_

Atoms with 5-7 valence electrons want to _electrons and become _charged ions. A Gain B Lose 3. Atoms with 1-3 valence electrons want to _electrons and become _charged ions. C. Positively D Negatively

Name:_ WS2.6 Chem.1: Unit 2 Review Hour: Directions: Match the statements at the left with the correct scientist at the right 1. conducted the gold foil experiment. 2. conducted the cathode ray tube experiment 3. _discovered the nucleus A. Democritus 4. _discovered the electron B. Bohr C. Thomson 5. _found the charge of the electron D. Dalton 6. _found the c...

When using a separatory funnel, when should it be vented? Immediately every time it is inverted Only during the frst inversion Only during the final inversion.

When the lonic compound magnesium chloride forms, a ragnesium atom loses efectrones each. The resulting opposhelly charged attr r a s

A 30.141 mg sample of a chemical known to contain only carbon, hydrogen, sulfur, and oxygen is put into a combustion analysis apparatus, yielding 53.694 mg of carbon dioxide and 21.980 mg of water. In another experiment, 38.053 mg of the compound is reacted with excess oxygen to produce 16.44 mg of sulfur dioxide. Add subscripts to the formula provided to co...

A student creates the model of a carbon-12 atom shown. He wants to add 3 more sub-atomic particles to the model to create a carbon-15 atom. Identify how many protons and neutrons he should add to the model. 3 Neutrons 2 Neutrons 0 Neutrons 1 Neutron 0 Protons 1 Proton 3 Protons 2 Protons

Using the balanced chemical equation for your unknown acid with NaOH. Let’s say you used 12.0 mL of acid and 12.0 mL of base in this reaction. Calculate the: 1. number of moles of each reactant used based on the molarity and volume used 2. limiting reactant 3. theoretical yield of water theoreti calyield=frac molesLR . molproduct/molLR . gproduct/molproduct ...