In a chemical reaction, one element replaces another element in a compound to form a new substance. Which of the following best describes this type of chemical reaction?
Combustion
Neutralization
Double Replacement
Single Replacement

single replacement

Explanation:

In the question it says one element replaces another element which means there is only one replacement.

the simple machine has three main features. they are:

fulcrum is the center point or pivot point of the machine. effort is input force/ applied force. load is external force/ output.

the keisha 's machine labels are

x : load

y: fulcrum

z: lever

the total distance traveled by the car is

30km + 49km = 79 km .