States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Which length is the longest?
![**Question: Which length is the longest?**
- ○ 0.035 km
- ○ 84 dm
- ○ 21,000 mm
- ○ 418 cm
***Explanation of options in detail:***
1. **0.035 km:**
- Kilometer (km) is a unit of length in the metric system, equal to 1,000 meters.
- Converting 0.035 km to meters:
\[ 0.035 \text{ km} \times 1000 = 35 \text{ meters} \]
2. **84 dm:**
- Decimeter (dm) is a unit of length in the metric system, equal to 0.1 meters.
- Converting 84 dm to meters:
\[ 84 \text{ dm} \times 0.1 = 8.4 \text{ meters} \]
3. **21,000 mm:**
- Millimeter (mm) is a unit of length in the metric system, equal to 0.001 meters.
- Converting 21,000 mm to meters:
\[ 21,000 \text{ mm} \times 0.001 = 21 \text{ meters} \]
4. **418 cm:**
- Centimeter (cm) is a unit of length in the metric system, equal to 0.01 meters.
- Converting 418 cm to meters:
\[ 418 \text{ cm} \times 0.01 = 4.18 \text{ meters} \]
From these conversions, the longest length is 35 meters (0.035 km).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F42c9ca3c-cb39-47fb-a603-0de5ef67ab03%2Fafc6e6b1-481e-42ef-bdd1-665e97328f95%2Fthunwjs_processed.png&w=3840&q=75)
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