CHEMISTRY!

Answer this carefully thanks


Identify whether the composition of substances in each statement is an element, compound or mixture.

1. Gold is used in making jewelry. It consists of an atom gold.

2. Helium is a gas used to inflate party balloons. It consists of helium atom.

3. Steel is an alloy a physical combination of the elements iron and carbon.

4. Ammonia in industry is used as fertilizer it is a chemical consisting of a nitrogen atom and three hydrogen atoms that are chemically combined.

5. Carbon dioxide needed in photosynthesis is a chemical combination of one carbon atom and two oxygen atoms.

6.Iron nail
7. Copper wire
8. Vegetable salad
9. Muriatic acid or Hydrochloric acid (HCl)
10. Agua oxigenada or Hydrogen peroxide (H2O2)

11. The density of an object is?
a) The mass divided by the volume D = m/v
b) The volume divided by the mass D = v/m
c) The same as its weight
d) The same as the size of the object

12. If two objects have the same volume but one has a greater mass, the one with greater mass
a) Has a lower density
b) Has a higher density
c) Will float
d) Will sink

13. If two objects have the same volume but one is made up of smaller and heavier atoms, the one with small heavy atoms will
a) be larger than the other
b) be less dense than the other
c) be denser than the other
d) float

14. If you cut a wooden block in half, each half would have
a) half the density of the original piece
b) twice the density of the original piece
c) the same density as the original piece
d) no density at all

15. A tiny piece of sand is very light but sinks in water. This is because _____ .
a) Sand is a solid
b) Sand is less dense than water
c) There is more water than sand
d) Sand is denser than water


I will report unhelpful answers!
​