Can someone check these answers for me? I know some if not all are wrong, but I don't know which ones they are.
-Substances are elements or compounds.
Sometimes
-Elements exist as molecules.
Never
-Compounds are molecules.
Sometimes
-Mercury is an element.
Always
-Ions possess charges.
Always
Substances are elements or compounds.
Sometimes yes, but always
-Elements exist as molecules.
Never sometimes. P4 and S8 are examples of two.
-Compounds are molecules.
Sometimes always
-Mercury is an element.
Always OK
-Ions possess charges.
Always OK
Hmmm...I keep trying these answers, but it says it's wrong. I'm not sure why...
Oh I see, the answer to "compounds are molecules" was in fact "Sometimes." Not exactly sure why, though...
The difference may be semantic. Compounds ALWAYS CONSIST of molecules but you may only SOMETIMES have a single molecule of a compound.
That may be the problem.
Ahh ok I see. Thanks for the help!
To check these answers, let's go through each statement and explain how to determine its accuracy:
1. Substances are elements or compounds.
- To determine if this statement is correct, we need to understand the definitions of substances, elements, and compounds.
- A substance is a form of matter that has a constant composition and distinct properties.
- An element is a pure form of matter consisting of only one type of atom.
- A compound is a substance made up of two or more different elements chemically combined.
- Therefore, substances can be either elements or compounds, so the answer is sometimes correct.
2. Elements exist as molecules.
- To determine if this statement is correct, we need to understand the concept of molecules and elements.
- A molecule is a group of two or more atoms held together by chemical bonds.
- An element consists of only one type of atom, which means it cannot form molecules.
- Therefore, elements do not exist as molecules, so the statement is never correct.
3. Compounds are molecules.
- To determine if this statement is correct, we need to understand the definition of a compound and a molecule.
- A compound is a substance made up of two or more different elements chemically combined.
- A molecule is a group of atoms held together by chemical bonds.
- Compounds can exist as molecules when their atoms are bonded together, but some compounds may not form discrete molecules.
- Therefore, compounds can be molecules in some cases, but not always. So, the statement is sometimes correct.
4. Mercury is an element.
- To determine if this statement is correct, we need to know about mercury.
- Mercury (Hg) is an element with atomic number 80 on the periodic table. It is a shiny, silvery metal.
- Therefore, mercury is indeed an element, and the statement is always correct.
5. Ions possess charges.
- To determine if this statement is correct, we need to understand ions and their properties.
- An ion is an atom or molecule that has gained or lost electrons, resulting in a positive or negative charge.
- Since ions gain or lose electrons, they possess charges by definition.
- Therefore, ions do possess charges, and the statement is always correct.
Based on the explanations above:
- Statement 1: Sometimes correct.
- Statement 2: Never correct.
- Statement 3: Sometimes correct.
- Statement 4: Always correct.
- Statement 5: Always correct.