Which of the following are clues that a chemical reaction may have taken place?

A. Temperature remains constant

B. Release of heat

C. Formation of a solid

D. Mass increase

For al, its atomic number is 13 and its mass number is 27. how many neutrons does it have

A 25 n box is pulled across a frictionless surface by an applied force of 22 n. the coefficient of kinetic friction between the box and the surface is 0.3. find the acceleration of the box. use g = 10 m/s2.

Rt a - the forces acting on an oil droplet watch the animation. identify the types of forces acting on an oil droplet while the voltage is turned on and the droplet is either falling or rising.

Which of the following statements about language is true? a There is a direct relationship between a specific word and the object or idea it represents. b All the languages in the world are symbolic except for Asian languages.

Yesemin is using a sugar cookie recipe with a flour to sugar ratio of 11: 6. To make one batch of cookies, 2.75 cups of flour are needed.

A 16.0 kg canoe moving to the left at 12.5 m/s makes an elastic head-on collision with a 14.0 kg raft moving to the right at 16.0 m/s. After the collision, the raft moves to the left at 14.4 m/s. Disregard any effects of the water.

How many significant figures does the number 91010.0 have?

Convert 9.75 millimeters to centimeters.

A 4357 kg roller coaster car starts from rest at the top of a 36.5 m high track. determine the speed of the car at the top of a loop that is 10.8 m high

A person runs at a speed of 4 meters per second. How far will the person travel in 40 seconds?