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Which of the following statements correctly distinguishes respiration from photosynthesis?
1. Photosynthesis needs oxygen, while respiration needs water
2. Photosynthesis needs carbon dioxide, while respiration needs oxygen and sugars
3. Photosynthesis makes oxygen, while respiration makes water
4. Photosynthesis makes water, while respiration makes carbon dioxide
Grade 8 Periodic Table and Elements
During which of these is oxygen being released?
1. cellular respiration
2. photosynthesis
3. breathing
4. fermentation
Grade 8 Periodic Table and Elements
When oxygen in the air reacts with iron, iron oxide forms. Which of the following statements is correct?
1. This is a physical change.
2. This is a chemical change.
3. Iron and iron oxide have the same properties.
4. Oxygen and iron have similar properties.
Compare and contrast mixtures and compounds. Which statement is true about mixtures and compounds?
1. Mixtures and compounds are the same throughout.
2. Mixtures and compounds are made of two or more elements in a definite proportion.
3. Mixtures must be separated by chemical methods and compounds by physical methods.
4. Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.
Grade 8 Periodic Table and Elements
Grade 8 Periodic Table and Elements
$MgF_2$ is an example of a(n)
1. Ionic bond
2. Metallic bond
3. Covalent bond
4. Noble bond