Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations key terms

mass change

The difference in mass observed during a chemical reaction when a gas is involved as a reactant or product.

gas

A state of matter that can escape from a reaction system, potentially affecting the mass measurement of reactants and products.

metal oxide

A compound formed when a metal reacts with oxygen, resulting in a product that may have a greater mass than the original metal.

mass change

The difference in mass observed during a chemical reaction, particularly when gases are involved as reactants or products.

thermal decomposition

The process in which a compound breaks down into simpler substances when heated.

carbon dioxide

A colorless, odorless gas produced during the thermal decomposition of metal carbonates.

mass change

The difference in mass observed during a chemical reaction, particularly when gases are involved as reactants or products.

non-enclosed system

A system where matter can enter or leave, affecting the observed mass changes during a chemical reaction.

mass change

The difference in mass observed during a chemical reaction, particularly when gases are involved as reactants or products.

particle model

A scientific model that explains the behavior of matter in terms of particles, including their movement and interactions during chemical reactions.

gas escape

The release of gas from a reaction that can lead to a decrease in mass in an open system.

gas uptake

The absorption of gas during a reaction that can result in an increase in mass in an open system.

mass change

The difference in mass observed during a chemical reaction, particularly when gases are involved as reactants or products.

suitable apparatus

Equipment that is appropriate for conducting experiments to measure mass changes accurately in chemical reactions.

uncertainty

The doubt that exists about the result of any measurement. In Chemical measurements, this term helps explain explain that every measurement has some uncertainty in the result obtained for AQA GCSE Chemistry 8462 Unit 4.3.

mean

The average value obtained by adding all measurements and dividing by the number of measurements.

distribution

the arrangement of values or measurements in a dataset, showing how they are spread out.

uncertainty

the degree to which a measurement result may vary due to limitations in the measurement process.

uncertainty

A measure of the doubt about the result of a measurement. In Chemical measurements, this term helps explain make estimations of uncertainty from a set of chemical measurements for AQA GCSE Chemistry 8462 Unit 4.3.

chemical measurement

The process of quantifying the properties of substances in chemistry. In Chemical measurements, this term helps explain make estimations of uncertainty from a set of chemical measurements for AQA GCSE Chemistry 8462 Unit 4.3.

uncertainty

The degree to which a measurement result may vary due to limitations in measurement accuracy.

range

The difference between the highest and lowest values in a set of measurements, used to assess measurement uncertainty.

measurement uncertainty

The doubt that exists about the result of any measurement. In Chemical measurements, this term helps explain interpret repeated results to judge measurement uncertainty. (WS 3.4) for AQA GCSE Chemistry 8462 Unit 4.3.

repeated results

Multiple measurements taken under the same conditions to assess consistency and reliability.

uncertainty

A measure of the doubt about the result of a measurement. In Chemical measurements, this term helps explain distinguish uncertainty from mistakes or anomalous results when discussing chemical measurements for AQA GCSE Chemistry 8462 Unit 4.3.

anomalous results

Measurements that deviate significantly from the expected value or trend. In Chemical measurements, this term helps explain distinguish uncertainty from mistakes or anomalous results when discussing chemical measurements for AQA GCSE Chemistry 8462 Unit 4.3.