When writing electron configuration the 3d block comes after the 4s block.

Question 4 options:

True

False

A scientist conducts an experiment to determine which fungi glow under ultraviolet light. What did the scientist most likely do before conducting the experiment? O A. Form a hypothesis B. Analyze data O c. Develop a theory D. Draw a conclusion

A flask contains 4.4g of carbon dioxide gas. calculate how many moles CO2 gas does it contains?

A parallelogram has side lengths of 4 and 6 and an angle of measure 55°. Law of cosines: a2 = b2 + c2 - 2bccos (A) What is x, the length of the diagonal, to the nearest whole number? 3 5 6 7

What is the scientific notation for 1073

Ten years ago, the ratio of birds to snakes in a local desert ecosystem was 2:5. Over the last 10 years, disease and hunting by humans has cut the bird population in half. The snake population has not changed.

A substance is analyzed and found to contain 85.7% carbon and 14.3% hydrogen by weight. A gaseous sample of the substance is found to have a density of 1.87 g/L, and 1 mol of it occupies a volume of 22.4 L.

Which property of a mineral sample does not influence how quickly it settles in water? 1) density 2) hardness 3) shape 4) size

Dinitrogen difluoride gas is collected at in an evacuated flask with a measured volume of. When all the gas has been collected, the pressure in the flask is measured to be.

How is the mass number of an isotope expressed in the name of an atom?

1. A sample of sodium chloride (NaCl) has a mass of 28.36g. Calculate the number of moles of NaCl in the sample. Show your work. 2. Calculate the number of moles of each element (number of moles of Na and number of moles of Cl) in NaCl in the sample.