The equation for the complete combustion of methane is:CH4(g) + 2O2(g) CO2 (g) +2H2O (g)If 1.60 g of methane were completely burned in 8.00 g of oxygen (an excess) to…

The sex of a species of fruit fly is determined by the number of X chromosomes relative to the number of non-sex chromosomes (A) in a cell. This is called…

Simplify:2x + 3     +      2x – 3 -2 2x – 3             2x + 3 Answer: 24) D Let us first solve the first…

A car is being driven at 20 m / s when the driver sees a child run into the road. The driver’s usual reaction time is 0.70 s, but this…

Which of the following have the same electron arrangement? Answer: 2) C In order to answer the question, we only need to find out how many electrons each of the…

Mitochondria are the site of aerobic respiration in animal cells. A theory of the evolution of animal cells states that these mitochondria may once have been aerobic bacteria that were…

A class of݊ n pupils takes a spelling test. Their mean score for the test is݉ m. Another pupil takes the test and scores݊ n. When this pupil’s result is…

Part of a radioactivity decay series is represented below. It involves the change of a nucleus M into a nucleus N by the emission of a beta-particle, followed by a…

The reaction between the gases S and T occurs according to the following equation. Which statement about this reaction is correct? Answer: 18) C A – a catalyst would increase…

The diagram shows part of the carbon cycle. Which row shows the numbered processes that use digestive or respiratory enzymes? Answer: 17) H In order to convert carbon in plants…