Choose the response that includes all the items listed below that are pure subst
ID: 994000 • Letter: C
Question
Choose the response that includes all the items listed below that are pure substances. orange juice ii. steam iii. ocean water iv. oxygen v. vegetable soup What is the name for P_2O_5 Which one of the following represents a chemical change? How many protons, electrons, and neutrons are in 48Ti^2+? 48 protons. 20 electrons. 22 neutrons 22 protons. 24 electrons. 26 neutrons 22 protons, 22 electrons, 26 neutrons 22 protons, 20 electrons. 26 neutrons boiling water to form steam bunting a piccc of coal breaking glass mixing iron filings and sand at room temperature What mass of LiF is needed to make 500 mL of a 0.500M solution? 2.4 km is how many millimeters?Explanation / Answer
You have too many questions, I will answer some of them and the rest, post them in another question thread:
1. A pure substance is a sample of matter with both definite and constant composition with distinct chemical properties. According to this definition, we can say that Oxigen is pure. Orange juice, vegetable soup and ocean water are solutions (mix of differents compounds. Steam could be a mix of H2 and O2 in gas phase.
2. a chemical change is represented in many ways. One of them is changing the physical state of water from solid to liquid or liquid to gas. According to this, boiling water to form steam is a chemical change, so this is the correct option.
3. use conversion factor:
2.4 km * 1000 m/1 km * 1000 mm/1m = 2,400,000 mm or simply 2.4x106 mm
4. 26.7 in scientific notation is:
2.67x101 or 0.267x102. In this case is 2.67x101
5. to know this, just count the decimals from the unit to the last decimal. in 1.3070 would be 5.
6. P2O5 is an non metallic oxide or anhydride of phosphorus, we have 5 oxygens and 2 P, so the name would be pentaoxide diphosphorus
The rest of the question post them in another question thread. Hope this helps