(2) Both substances are compounds.
(3) Substance A is an element and substance Z is a compound.
(4) Substance A is a compound and substance Z is an element.
Answer;
(3) Substance A is an element and substance Z is a compound.
Explanation;
-A compound is a substance formed when two or more chemical elements are chemically bonded together, such as water, carbon dioxide, methane, etc while an element is a pure chemical substance made of same type of atoms, such includes, oxygen, potassium, hydrogen, carbon, etc.
- Compounds can be brokendown or decomposed into simpler substances: elements cannot be broken down chemically into simpler substances .
joules.......I hope this helps
B. Reflection
C. Diffraction
D. Resonance
Answer:
Explanation:
A chemical change, as the name suggests, must result from a change in the chemical makeup and new substances are produced. A very common example is metal rusting.
A physical change can be observed without a change in chemical composition. No new substances are produces. Ripping paper and an ice cube melting are physical changes.
A rubber band stretching is a physical change. No new substances are made and the chemical makeup remains the same.
Answer:
physical
Explanation:
this is a physical action to create a change. does not involve chemicals or elements
Most metals are not liquid at room temperature. They are typically solid and have a crystalline structure. Therefore, the correct option is option 3.
Metals are known for their high thermal and electrical conductivity, as well as their malleability and ductility. These properties allow metals to be shaped into various forms, such as wires and sheets, and conduct heat and electricity efficiently.
However, the majority of metals have a solid state at room temperature, with exceptions such as mercury, which is a liquid metal. The solid nature of metals is due to the metallic bonding between atoms, which involves the sharing of electrons within a sea of delocalized electrons.
Thus, the ideal selection is option 3.
Learn more about Metals, here:
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The complete question is -
Most metals are NOT-
Ductile
good conductors of heat and electricity,
liquid at room temperature,
malleable.
2. It is the simplest ratio of atoms in a formula unit.
3. It represents the true molecular mass of a chemical formula.
4. It represents the highest ratio of coefficients in a chemical formula.
Answer:
2. It is the simplest ratio of atoms in a formula unit.
Explanation:
The empirical formula refers to how to provide the minimum proportion in which chemical elements combine into one substance. Sometimes it may happen that the minimum formula is equal to the molecular formula of the compound; However, this is not always true. In short, the empirical formula refers to the simplest ratio of atoms in a unit of formula.
For example, the empirical or minimal formula of water is H2O, indicating that there is a 2: 1 ratio between the elements that make up water molecules. And, coincidentally, this is also the molecular formula of water.