Question

fill in the blanks with the numbers ______________ is a measure of the resistance to flow. A high _____________ liquid has a high resistance to flow and flows slowly. The ancients thought everything in the world was made of 4 __________. We now know that there are 94 naturally occurring _____________ and scientists have created another 24 _________. I am certain they will create even more. Honey flows slowly because it has a high _______________ to flowing. A ______________ can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. A _________________ cannot be separated by physical means. All matter is made up of __________. All elements are ________ with the same number of protons. If it is just a single ______ or many _______ bonded together, if all of them have the same number of protons, it is an element. In a piece of pure iron metal, all the _____ are joined together, that piece of iron metal is called elemental iron. A single ______ of iron is called elemental iron. A ___________________ mixture has differences from place to place. We might need a microscope to see them or they might be obvious to the unaided eye. There are surfaces separating it into different phases. A _________________ mixture is the same everywhere. It is uniform. There are no surfaces separating it into different phases. If different kinds of atoms (different elements) are bonded together by their electrons, it is called a __________. There are physical means of ____________ to isolate the different pure substances in a mixture and there are chemical means of ____________ to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance

Answer 1

The answers are listed below according to number and sequence:

9. Viscosity

10. Resistance

1. Elements

1. Elements

1. Elements

9. Viscosity

3. Mixture

6. Pure substance

7. Atoms

7. Atoms

7. Atoms

7. Atoms

7. Atoms

7. Atoms

4. Heterogeneous

5. Homogeneous

2. Compound

8. Separation

8. Separation

If you'd like to know more about this, read on:

Viscosity as mentioned above is the resistance of a fluid to flow or deform. You could think about it as the "thickness," of fluid. Honey is viscous, so the resistance of it to flow is high. If you compare it to water, water easily deforms, which means it has low viscosity.

In the ancient times, the Greeks believed that Earth was made up of 4 elements, which are Earth, Water, Air and Water. Aristotle even added a 5th element later on, which was Aether. This was the belief during 450BC.

Elements today is not what they used to think. 94 of them naturally occur on Earth, and the 24 elements are synthesized or made in laboratories.

Matter is made up of atoms.

Matter can be separated into two categories based on composition: Pure substances and Mixtures.

Pure substances can also be categorized into either elements or compounds.

All elements are made up of atoms. Each element have specific number of protons and that is what helps identify the element. The number of protons indicate the atomic number, which is the number you usually see on the top of the element in a periodic table.

Compounds are two or more elements that are chemically bonded. This is what makes it different from the other category of matter, which is mixtures.

Mixtures is a combination of 2 or more pure substances that are not chemically bonded. They can be physically separated as well.

Mixtures can either be homogeneous or heterogeneous. Homogeneous mixtures have a uniform appearance, which means they look the same throughout. They also usually contain one phase, either liquid, solid or gas. A good example would be Air. Air is made up of different pure substances but are not visible. (It is not just oxygen)

Heterogeneous on the other hand are mixtures is a combination of pure substances and usually more than one phase. An example of this would be oil and water. If you look at oil in water, you can distinguish both in the mixture. Not all can be seen easily, but if you use microscopes, you can see how they are separated.

There are ways to separate mixtures, like filtration, distillation, and many more. These are physical methods of separation. Pure substances are chemically separated.