A helium balloon contains 0.46g off helium. how many moles of helium does it contain?

A student places a 12-gram cube of ice inside a container. After six hours, the student returns to observe the contents of the container. Which mtence suggests that the container is an open system? O A.

4) Terry's dog is racing down the lane in the part toward the east. The dog travels 36 meters in 18 seconds before it stops running. The velocity of the dog is. A. 2 m/s east B. 4 m/s east C. 8 m/s east D. 10 m/s east

After drawing the Lewis structures for the following covalent compounds which has the most bonds? a. H2S b. O3 c. SO3 d. NF3

Calcium (Ca) has an atomic number of 20. What is calcium's ground-state electron configuration? 1s21p61d101f2 1s21p62s22p63s23p2 1s22s22p63s23p64s2 1s22s22p63s23p63d2

Ora had a chemical splash into her eyes. She immediately told her teacher and went to the eyewash station. She then proceeded to wash her eyes out until they no longer hurt, which took about ten minutes.

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3

Identify and briefly describe two ecosystems in your community that are beyond schoolyard

Is N2H2 a ionic compound?

What do Lewis dot structures show?

300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percentage of carbon as it has oxygen. The percentage of hydrogen is known to be 5.98823%.