Which of the following is a phase change?

an explosion

mixing paint

a suspension

ice melting

AThe proper pH range for a swimming pool is between 7.2 and 7.8. Most pools use two substances, Na2CO3and HCL, to maintain this range. How would you adjust the pH if you found it was 8.2? 6.9?

Electroforming is basically the same process as electroplating, but it is used to create a part formed around a pattern, and the plate thickness is much greater than in electroplating: True or false?

Which answer accurately describes the difference between speed and velocity? Question 8 options: A. Speed can be constant or it can change. Velocity is always constant. B. Speed requires direction. Direction doesn't matter when calculating velocity.

Sunlight is a form of electromagnetic energy true of false?

A (n) 1555.4 kg car is coasting along a level road at 40 m/s. A constant braking force is applied, such that the car is stopped in a distance of 55.6 m. What is the magnitude of the braking force? Answer in units of N.

Bio mass, sun, wind, water

What is the mass of 5 moles of gold

A crane lifts a 400 N crate full of baked beans 15 m. How much work was done by the crane?

High altitude high velocity rivers of air are called

A string of 18 identical Christmas tree lights are connected in series to a 130 V source. The string dissipates 61 W. What is the equivalent resistance of the light string? Answer in units of Ω.