Explain how you know that gasoline burning in a car engine is a chemical change.?

A+slab+of+a+thermal+insulator is 100cm2 in crss-section and 2cm thick. If it has a thermal conductivity of 0.1J/s/m / (C°) and a temperature difference of 100°C between opposite faces: calculate the heat flow through the slab in a day

our canisters contain helium gas. If all the canisters had the same amount of particles, which canister would have the fastest moving particles?

An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? Question 15 options: The one on the moon The one on Earth Not enough information to say They have the same mass.

How are atomic emission spectra like fingerprints for the elements

What is the closest of a measurement to the actual value being measured

Water is a compound. O A. True B. False

How do air quality scientists ensure the air is cleaned? What steps do they take?

Is a mirrors surface opaque or transparent or translucent?

Sound waves can combine to become bigger or smaller true or false

Archimedes supposedly was asked to determine whether a crown made for the king consisted of pure gold (density of gold is 19.3 * 103 kg/m3). According to legend, he solved this problem by weighing the crown first in air and then in water.