Which one of the following is an example of a weak acid?

O

A. Sodium hydroxide

O

B. Magnesium hydroxide

O

C. Hydrochloric acid

O

D. Acetic acid

Give one reason why the density of iron is higher than the density of oxygen

A 12 kg box sliding on a horizontal floor has an initial speed of 4.0 m/s. The coefficient of friction between the box and the floor is 0.20. The box moves a distance of 4.0 m in 2.0 s.

What are beats? Physics B

Jana filled a cup with water. She put the cup in the sunlight and checked the temperature every 30 minutes. After 90 minutes, she moved the cup into the shade. She continued to measure the temperature every 30 minutes.

Unless otherwise posted, what is the speed limit for cars in a residential area?_ A) 20 mph B) 25 mph C) 30 mph

As protostars continue to contract, their cores become hotter and more dense until what process begins ...

Emily jogs 3 laps at the track to warm up. She jogs at 5 mph. Then she runs 3 more laps at 7 mph. What is true about her average speed and her average velocity?

Which of the following elements are the most reactive? beryllium, calcium, magnesium, barium?

1.) State which definition of power below is correct. A.) the energy transferred per hour. B.) the energy transferred. C.) the energy transferred per second. D.) the force over a distance. 2.

Science and technology are closely related, but not the same. Which of the following is most likely a result of technology, not science?