Which of the following describe chemical properties?
- water boils at 0c
- helium is th...
Chemistry, 14.10.2019 04:30 ednalovegod
Which of the following describe chemical properties?
- water boils at 0c
- helium is the lightest monatomic element
- sugar burns in air to form water and carbon dioxide
- iodine (a purple solid) becomes a purple gas
Answers: 3
Chemistry, 23.06.2019 03:00, sharondacarruth1656
Is it safe to take 450mg of diphenhydramine hydrochloride?
Answers: 1
Chemistry, 23.06.2019 10:30, malum2009
Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.
Answers: 2
Chemistry, 23.06.2019 16:30, peperivera2652738
In chile, the deepest earthquake occurred at 61.7°w longitude at a depth of 540 km. if the rocks at the focus began subducting 10 million years ago and are now 1000 km from their original position, what is the average rate of subduction in cm/yr?
Answers: 1
Chemistry, 23.06.2019 16:50, alexisbaronetp85kek
How can a scientist assess whether a pure niobium (nb) sample is responsible for contaminating the lab with radioactivity? test the niobium sample to see whether it now contains other elements. test the niobium sample for the presence of niobium oxide compounds. heat the niobium, and see if the level of radioactivity in the lab increases. place the niobium under pressure, and see if the level of radioactivity in the lab increases.
Answers: 3
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