Directions: Fill in the blank with the correct word. Choose from the list of possible answers in the word bank below:
1. An is made up of just one kind of atom.
2. Matter is made up of tiny .
3. In a mixture called a the particles are larger and can settle out.
4. A of water is made up of two hydrogen atoms and one oxygen atom.
5. Two or more elements chemically combined form a .
6. are the building blocks of matter.
7. Seawater is an example of a mixture because it is the same throughout.
8. Vegetable soup is an example of a .
9. In a one substance is dissolved in another.
10. A mixture that is not the same throughout is called a mixture.
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This seems like a whole test...And I can't read the last question on the bottom. It has a weird symbol on it...
Controlled experiment is an experiment which is designed to test a variable, which can be changed during the experiment.Explanation:
Hence in this experiment, the importance of experiment is being tested, as it is added only in one set of plant.
A manipulated variable is an independent variable whose amount can be changed during an experiment.
Here the fertilizer is a manipulated variable.Question 2:
Because theory is the most organised statement proved by a set of independent experiments.Explanation:
Hypothesis is the initial idea on which basis different experiments are conducted. But if 1 experiment succeeded and it supports the hypothesis, hypothesis do not become a theory.
For a theory, different experiments are necessary which supports that hypothesis.Question no 4.
Density = 1.909 kg/m3Explanation:
Mass of the object = 42 kg
Volume of the object = 22 m3
Density of the object = ?
Density = mass/volume
Density =42/22 = 1.909
Density = 1.909 kg/m3
Hence the density of the object is 1.909 and its unit is kg/m3 which is system international unit of density.Question 5.
Chlorine and water in swimming pool are mixed in such a way that there composition remains same throughout the mixture. And chlorine cannot be separated back from water. This is the homogeneous mixture.Explanation: A homogeneous mixture is a mixture of more than one substance which are mixed together in such a way that they cannot be separated and the composition of the mixture remains same throughout the mixture. Example of homogeneous solution is sugar solution in water. As for swimming pool cleaning chlorine is added in pool water, it mixes in the whole water by diffusion. Hence it is a homogeneous mixture. Question no. 6.
Because physical change does not include composition change, it includes change in physical parameters. And in splicing tomato only change in shape is done.Explanation: Chemical change means irreversible chemical composition change like the burning of toast. Physical change means reversible or irreversible change in shape, volume density without change in chemical composition. Splicing tomato comes under 2nd category because it does not include chemical change.
Remaining questions are attached in the files.