Chan hee is inflating a basketball using an air pump. he notices that the pump gets warm as he uses it. what is a good hypothesis that could lead to new experimentation?

Describe when an ionic compound can conduct electricity

Electrolysis uses electrical current to break water molecules into oxygen gas and hydrogen gas. How do you know that this is a chemical change?

In a different experiment, the student uses a calorimeter which is perfectly insulated. She fills the calorimeter with 100.0 g of 25.00°C dilute HCl solution and adds 0.594 g Mg metal (24.3 g/mol). The final temperature of the apparatus comes to 41.

A sample of hydrated calcium sulfate has a mass of 2.643 g. After dehydration, the sample has a mass of 2.090 g. What is the percent by mass of water in the hydrate?

Why the element in periodic table which have more than three electron valens must plus ten in order to know the group in periodic table?

A compound is a pure substance. It can not easily be broken down into parts by physical means. A) True B) False

How do you use the periodic table to find the matter, number of subatomic particles, family name, reactivity, and number of valence electrons?

You see rainforests a is far as the eye can see It rains every day and the humidity is fiercel Where might you be? Polar climate Tropical climate Subtropical climate Temperate climate

What is the evaluation of 60.1 x - 9.2? (I pressed chemistry, but I ment to press mathematics, sorry!)

How can I calculate the percent concentration of solution? m solute = 15g m solution = 100g