Grade 7 Science Questions???

Question

I am doing a unit on substances in my grade 7 class.

1. Are these solutions or mechanical mixtures ?: wood, orange juice, tap water, a loonie coin.

2. What would an example be of a solid in a solid?

If anyone can help me, it would be greatly appreciated.

Thank you, everybody! Now I understand it a little bit better. I'm not sure who to pick for best answer, but I will in a few hours.

Answer 1

1. A solution is when you dissolve or mix something with water.
So wood is not a solution, neither is a loonie.
Orange juice is, and tap water is as well (its a thin solution of minerals in water).

2. A solid in a solid - a hardboiled egg (sort of, a hardboiled egg isn't a complete solid like a rock but its not a liquid or a gas), a twonie coin, crystals inside a rock (called a geode), or maybe a stawberty frozen inside an icecube.

Answer 2

Homework questions.................why can't you just figure these things out by using your gray matter. When you grow up, bosses will expect it of you, and you won't last long at a good job unless you do. But, I guess McDonald's or Starbuck's could always use cheap labor.

What is a mechanical mixture? Do rivers of orange juice just naturally flow in the "Great White North"? Don't think so. Orange juice comes from..............Oranges -- peeled, pulverized, Pastuerized and packaged. Sounds pretty mechanical.

Do "loonie coins" grow on trees? Don't think so. 91.5% Nickel, coated with Bronze (about 7.5% Copper and the rest is Tin). Is it a pure substance or a mixture, mechanically put together? You decide.

Now, if you're going to tell me you're having problems with tap water (not natural spring water, eh?) or wood, then your noggin's atrophied.

Question 2??? I guess diamonds aren't a girl's best friend. Look up Kimberlite on the "net". Read up on it.

Answer 3

A loonie coin is a mechanical mixture. Tap water could be either. My tap water has both naturally dissolved minerals and mechanically added minerals.

Wood is neither. Wood is a mixture, but it's hardly mechanical.

Orange juice is a solution, I guess, unless you have pulp. Even then, it's not mechanical. There is orange juice inside the orange. It's mechanically removed from the orange, but humans don't mix it. Well, unless it's Minute Maid.

Fly in amber?
Occlusions in a gem?
Those lucite paperweights with the glass art inside them?
Novelty ice cubes?

Answer 4

1) Dry wood is obviously a mixture. Orange juice contains insolubles as well as solubles - both a solution and a mixture. You can do tap water by yourself. A loonie is 91.5% Ni (core), 8.5% bronze plating (88% Cu, 12% Sn). Work it out.

2) Be naughty - a toonie! Raisin bread, too.

Answer 5

An example of a solid in a solid would be steel. Steel is mostly iron, but other metals such as nickel or chromium are added. In some specialized types of steel, beryllium is added.

The entire thing is melted and stirred so that the metals disperse within each other evenly and then the whole thing is cooled down.

In essence, the nickel (for example) is dissolved within the iron.

Answer 6

wood orange juice tap water are all subs.
a loonies is mechanical mixture.
a grain of sand with in a sand stone.

Answer 7

To much Q. !!!!!!!!!😤😤😤😤