Depends on the severity of the procedure. If it's something simple then often they don't use anything and rely on the people keeping their mouth open on their own. When more complicated procedures are happening, then they use a Cheek Retractor, which is a fairly simple device that holds the mouth open and enables them to work even if you're sleeping due to anesthesia.
Answer: increase temperature by adding heat, increases the surface area of the reactants, increase the concentration of the reactants, or add a catalyst.
Explanation:
The number of significant figures in each of the following numbers are as follows:
- 640 cm³ - number of significant figures: 2
- 200.0 mL - number of significant figures: 4
- 0.5200 g - number of significant figures: 4
- 1.005 kg - number of significant Figures: 4
- 10,000 L - number of significant figures: 1
- 20.900 cm - number of significant figures: 5
<h3>What is significant figures?</h3>
Significant figures are those figures that are meaningful with respect to the precision of a measurement.
In other words, a digit that is nonzero, followed by a nonzero digit,or (for trailing zeroes) justified by the precision of the derivation or measurement is a significant figure.
Based on the question, the number of significant figures in each of the following numbers are as follows:
- 640 cm³ - number of significant figures: 2
- 200.0 mL - number of significant figures: 4
- 0.5200 g - number of significant figures: 4
- 1.005 kg - number of significant figures: 4
- 10,000 L - number of significant figures: 1
- 20.900 cm - number of significant figures: 5
Learn more about significant figures at: brainly.com/question/14359464
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A proton is a subatomic particle that has a positive charge