Question:

which statement about chemical reaction rates is true?

answers:

(a) the reaction rates cannot change.

(b) the reaction rates are always constant.

(c) the reaction rates can increase.

(d) the reaction rates cannot decrease.

How many molecules are present in 3 mols of silicon dioxide (sio2)?

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

What is the magnitude of the acceleration vector which causes a particle to move from velocity −5i−2j m/s to −6i+ 7j m/s in 8 seconds. answer in m/s.