Chemistry » Page 69

Chemistry

Carlee Cohen

True or false. elements in the same period have the same number of valence electrons

Answer Answers (1)

Chemistry

Cohen Mata

A base a. causes phenolphthalein indicator to change from colorless to pink. b. donates a proton in a proton transfer reaction. c. accepts electrons in an electron transfer reaction. d. produces hydrogen ions in solution. e. does none of the above.

Answer Answers (1)

Chemistry

Lorelai Zavala

Which of these is an indicator that a chemical reaction has occurred?

precipitate forms

temperature remains the same

color is diluted

mass increases

Answer Answers (1)

Chemistry

Trace

The half-life of isotope X is 3 days, how long will it take for one half of 10g sample to decay

Answer Answers (1)

Chemistry

Donovan

A 69.1-g sample of h2o contains how many molecules of water?

Answer Answers (1)

Chemistry

Kimberly Cox

Why is ac used instead of dc

Answer Answers (1)

Chemistry

Raegan Briggs

A metal, M, forms an oxide compound with the

general formula M20. In which group on the

Periodic Table could metal M be found?

Answer Answers (1)

Chemistry

Edgar Campbell

In your reading, perhaps you saw that in 1995, three chemists were awarded the Nobel Prize for their studies involving the ozone layer. First, in 1970, scientist, Paul Cruzen, hypothesized that nitrogen oxides could participate in the destruction of ozone. He was concerned that high-flying jet aircraft, such as the Concorde, could be the culprit that created the nitrogen oxide. He proposed the following mechanism to show how these compounds were involved in the destruction of ozone: Step 1 : NO (g) + O3 (g) → NO2 (g) + O2 (g) Step 2 : NO2 (g) + O (g) → NO (g) + O2 (g) The rate equation for this reaction was found to be: Rate of reaction = k[NO][O3] Looking at this rate law, which of the above steps would be the rate determining step and why?

Answer Answers (1)

Chemistry

Cali Medina

What is the resultant molarity of 20mL of a 3.5M solution is diluted to 100mL? Will mark brainliest

Answer Answers (1)

Chemistry

Judah Leonard

The shape of molecules that contain only two atoms is

Answer Answers (1)

Chemistry

Serena Santiago

Standing near a campfire, you can feel heat. This is an example of

a) acceleration

b) conduction

c) convection

d) radiation

Answer Answers (1)

Chemistry

Natalya Glass

Find the mass in grams of 2.00*1023 molecules of C10H140

Answer Answers (1)

Chemistry

Madalyn Gill

Choose the substance with the lowest surface tension. Choose the substance with the lowest surface tension. a) H2O b) (CH3) 2CO c) CH3CH2CH2CH3 d) C6H6 e) CH3OH

Answer Answers (1)

Chemistry

Peter Dunlap

the men's world record for swimming 1500.0 m in a long course pool (as of 2007) is 14 min 34.56 s. At this rate, how many seconds would it take to swim 0.150 miles?

Answer Answers (1)

Chemistry

Kate White

Why is radioactive decay a good method of measuring the absolute age of ancient fossils

Answer Answers (1)