Answer:
1) harm life forms that rely on carbonate-based shells and skeletons, 2) harm organisms sensitive to acidity
Explanation:
Explanation:
19/9 F -1 (19 is stacked over 9 next to F) #protons: 9, #neutrons: 10, #electrons: 10
55/26 Fe +3, atomic #: 26, mass #: 55, #protons: 26, #neutrons: 29, #electrons: 23
2.7 x 10^24, since 4.5 has two significant figures.
Answer:
Element: Sulfur ; S
Compound: Water ; H2O
Mixture: Gunpowder ; 2 KNO3 + S + 3 C -> K2S + N2 + 3 CO2
Explanation:
An element is a pure substance that cannot be broken down into simpler substances. A periodic table for example has elements.
A compound is a chemical substance that's made of multiple elements held together by chemical bonds. All elements from the periodic table can be combined to make a compound but they have to bond a specific way in order for them to actually make something. Water is the easiest to remember.
A mixture is two or more substances that are physically combined. They are not chemically combined though. There are a few types of mixtures including homogeneous, heterogeneous, etc. Gunpowder is actually a mixture. It contains sulfur, carbon and potassium nitrate.
Don't be afraid to reach out with further questions, I hope this helps!
Strontium (Sr) lies in the second group of the periodic table, which means it has two valence shell electrons so it forms the Sr⁺² ion. Meanwhile, bromine (Br) has seven valence shell electrons, which means it forms the Br⁻ ion. Each strontium atom is therefore able to donate electrons to two bromine atoms. So the ratio of the ions in neutral strontium bromate (SrBr₂) will be 1 : 2.