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Questions in Grade Middle-school

[Free] How does vinegar affect the growth of a plant?

[Free] What details from the May 15th entry prove that Charlie's intelligence is growing and increasing daily?

[Free] Iron is a solid, grey metal. Oxygen is a colorless gas. When iron and oxygen chemically combine, rust is formed. Rust has a reddish-brown color. **Why does rust differ from iron and oxygen?**

[Free] A water molecule gains enough energy to enter the gas phase. Is this a chemical or physical change? Why?

[Free] Why is there no ocean-continent divergence?

[Free] Argyle has 8 t-shirts and 5 pairs of shorts that he wears with either sandals or sneakers. If all the colors and patterns coordinate, how many different outfits can he make?

[Free] Your body consists of \(\frac{7}{10}\) water. Is more than \(\frac{1}{2}\) of your body water? Explain.

[Free] Florence wants to buy onions and doesn't want to spend more than $3. Can she buy 2.5 pounds if they are $1.25 per pound? Write the inequality to find the answer.

[Free] I am a number between 500 and 600. My ones digit is 5. My tens digit is the difference between my ones and hundreds digits. Who am I?

[Free] What is \( E = mc^2 \), the famous theory of Albert Einstein?