Find the correct title about calcium.

Three percent of the Earth's crust is made of calcium. It's everywhere, but you rarely find it alone. It's almost always in some compound with other elements.

Find the correct title about calcium.

While calcium is super important to your bones and teeth, it's just as important in smaller amounts to your nerves and muscles. On an atomic level, calcium ions are used to trigger nervous and muscular activity.

Find the correct title about calcium.

We're not sure if this is still true. But once upon a time, your teacher's chalk was made with calcium carbonate.

One of the most famous compounds is limestone. It is...

What color have rust?

Find the correct title about iron.

We'll start big. The core of the Earth is believed to be made of molten iron. A huge ball in the center of our planet. Just outside of the core are other layers with molten iron and other elements. That core of iron creates the Earth's magnetic field..

Find the correct title about iron.

On the other end of the size chart is the compound hemoglobin that uses on atom of iron in each molecule. Hemoglobin is the compound found in your red blood cells that carries oxygen throughout your body.

Find the correct title about iron.

Even though the core is made of iron, there is still a large amount of iron in the crust of the Earth. It is the fourth most common element. All of the reddish rocks have trace amounts of iron.

Find the correct title about iron.

Iron was used alone for many years. Historians call it the "Iron Age." Eventually metallurgists started to mix iron with other metals and developed many alloys. The most successful of these alloys has probably been steel which is used to make everything from paper clips to skyscrapers.

Find the correct title about iron.

Iron is a very magnetic element. Large amounts can create the magnetic field of the Earth. Smaller amounts can be used to make magnets that you use every day. It might be the pointer on a compass or a horseshoe magnet used in science class.

Iron belongs to the group

Find the correct title about aluminum.

The next time you sit down to eat dinner at a restaurant you should know that aluminum was used to make the utensils. When you see forks, knives, and spoons they usually have some aluminum inside.

Find the correct title about aluminum.

Aluminum is a really light metal. When it is mixed with other elements it can also become very strong. Engineers found out that they could build airplanes with aluminum because it is sturdy and light.

Find the correct title about aluminum.

There is a very special stone called a ruby. It is found in all sorts of jewelry. It has a very deep red color. There are aluminum atoms inside of all rubies.

Find the correct title about aluminum.

Wow! Aluminum is in a lot of gem stones. First you learned that it is in rubies and now you're learning that aluminum is inside of sapphires. Maybe rubies and sapphires aren't that different!

Find the correct title about aluminum.

This one's easy! You should know what an aluminum can is. All of your soda usually comes in cans and those cans are usually made of aluminum.

Карбонат кальция по другому называют

Кальций, как и другие активные металлы, легко окисляются на воздухе. Поэтому его хранят..

Число электронов на внешнем энергетическом уровне атома алюминия

Алюминий

Самый распространённый металл в земной коре

Самый тугоплавкий металл

В протекторной защите от коррозии в качестве протектора используют наиболее активный металл. Если конструкция будет сделана из цинка, какой металл необходимо использовать в качестве протектора

Назовите вид коррозии

Назовите вид коррозии

Назовите вид коррозии

Назовите вид коррозии

Ржавчина имеет формулу

Какие ионы обуславливают временную жёсткость?

Формула известковой воды

Кальций и его соединения окрашивают пламя

Лакмус в растворе сульфата меди имеет цвет

Железо вытесняет металл из раствора соли

Наиболее твёрдый металл

Наиболее электропроводный металл

Самый тяжелый металл

Железо

Молярная масса карбоната кальция

Молярная масса хлорида алюминия