✅Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.
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Answer:
C. pieces of hair found at the crime scene.
Explanation:
using the pieces of hair, you can get the DNA of the person. This will give u a better lead in solving the crime.
Hope it helps u ....
The correct option is B.
Matters exist in three phases, which are solid, liquids and gas. These three phases behaves differently based on their structures. Solids have definite shape and volume and their particles are tightly connected, so their particles vibrate about a fixed position. Liquids have definite volume but no shape. The inter molecular force among liquid particles is not as strong as that of solid, so the particles can move around slowly. Gases has no shape and no volume. The inter molecular force in gas particles are negligible and thus, they move about freely and randomly and fill all the available spaces.
Answer:
The answer to your question is the letter B.
Explanation:
Data
Single replacement reaction
Definition
A single replacement reaction consists most of the times of a metal that reacts with a compound and this metal replaces the cation of the compound.
The options show
A. A synthesis reaction
B. A single replacement reaction
C. A double replacement reaction
D. A double replacement reaction
<span>For addition and subtraction you round to decimal places.
Round the number so that it has the same number of decimal places as the number in your data that has the least number of decimal places.
9 cm + 2.8 cm = 11.8 cm
the 9 has no decimal places so
= 12 cm
(this is rounded to 0 decimal places.)
(It has 2 sig figs) </span>
