high-density protogalactic clouds
rapidly spinning protogalactic clouds
colliding/merging protogalactic clouds
Answer
Explanation:
Acid and base have different characteristic which identify either it is acid or base.
1. Substance A is tested and found to have a pH of 3.
This option is for acid because acid have pH in the range of 0-6
2. Substance B, a common food, tastes sour?
This option is also for acid because acid have sour taste.
3. Substance C causes metals to corrode.
This option is also for acid because acid can cause corrosion
4. Substance D feels slippery in solution
This option is not for acid but it is for base because bases have the properties of slippery.
In chemistry and phase equilibria, phase transition is a common phenomenon. There are many terms related to the phase transition. The process deposition is a physical process. This process is the opposite of sublimation.
Deposition is a phase transfer or phase transition process in which a substance in the gaseous state changes directly to the solid state. Freezing of air is an example of deposition in which the water vapour directly changes to ice.
Here the gaseous state converts into solid state without being in the liquid state.
An example is:
CO₂ (g) → CO₂ (s)
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The measurement 0.025 g has two significant digits. Leading zeroes are not counted as significant.
The correct answer to the question is (b) 2. The number 0.025 g has two significant digits.
In Physics, a significant digit is any non-zero digit or any embedded or trailing zeroes in a number. Leading zeros, which are zeros at the beginning of a decimal number, are not considered significant digits. In the number 0.025 g, the leading zeros are not counted as significant because they only indicate the decimal place of the significant digits (in this case, the digits 2 and 5). Therefore, the number of significant digits is 2.
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