When recording a measurement we report the final value in terms of number followed by specific units. The numeral has to be reported to correct number of significant figures. The final answer must have all the known figures with one estimated digit. In order to see which number is significant we follow a set of rules. All non zero numbers are significant. Embedded zeroes are significant. In a decimal, leading zeroes are insignificant. Trailing zeroes are not significant unless present in a decimal number.
Units are the second important thing to consider while recording a measurement, units give us an idea on what the dimensions of measurement are. For example, length is measured in the units of meters, mass in thee units of grams.
Answer:
chemical change occur when a substance combines with another to form a new substance.
Explanation:
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Answer:
Concentration of the reactants decreases;
Rate of a reaction decreases
Explanation:
Since volume is held constant in a solution, the concentration of the reactants will decrease.
Simply speaking, concentration is the ratio between moles and volume. Volume is constant here. Over time, the number of moles of the reactants will decrease, as they react to produce products and they are disappearing. Since moles are directly proportional to concentration, this implies that concentration will also decrease, while the concentration of the products will increase, as they're formed.
The rate of a reaction decreases as the reaction continues, as we have lower and lower amounts of the reactants remaining in the solution as time progresses. Therefore, the probability of a successful collision leading to products decreases.
d. it forms lighter atoms changing them into gasses instead of a liquid
