A rectangular steel block of dimension 100cm * 50m * 20cm has a mass of 450kg. Calculate the density.

6h2s 6co2 6s0 glucose takes place under aerobic conditions. takes place under anaerobic conditions. the amount of oxygen does not make any difference.

How many electrons will fluorine gain or lose in forming an ion

What improvements have been made in modern farming? Select all that apply. 1. machines can do more work over less time 2. better seeds sprout and grow much more quickly 3. trains can transport food over long distances faster 4.

4. which answer below is the formula mass of a water molecule? a. 18.02 amu b. 18.02 moles c. 18.02 grams d. 6.02 x 102 molecules

What is the formula for the ionic compound formed from the lead (ii) ion and the carbonate ion?

O2 (g) → O2 (l) Predict whether the reaction above would have an increase or a decrease in entropy.

The periodic law states that the physical and chemical properties tend to repeat periodically when elements are arranged according to what trend

In which of the following situations does water undergo a change in physical properties? a. The bathroom fills with steam when you take a hot shower. b. The neighbor's pond freezes over in winter. c. Water is broken down to yield H2 and O2. d. a.

Which statement best describes the ideas of two scientists who studied properties of light? Newton and Maxwell had similar ideas about light being made of particles.

As transformações estão presente em nosso cotidiano, elas nunca param de acontecer, na sua maioria invisível a olho nu. Quais critérios é preciso observar para identificar se ocorreu transformação?