Chemistry, 20.09.2020 18:01 kelseeygee
Why do heated molecules rise? a Because they are less dense than the molecules around them b Because they are moving slower than the other molecules c Because they are denser than the molecules around them
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Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
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Chemistry, 23.06.2019 13:30
These traits describe either a chemical or a nuclear reaction. which statements describe a nuclear reaction? check all that apply. involves the loss, gain, or sharing of electrons may involve a change in total mass involve relatively low energy changes occur outside the nucleus involve very high-energy changes involve changes in nuclides when decay occurs
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Chemistry, 23.06.2019 16:30
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: 2
Chemistry, 23.06.2019 17:30
Iput 40 points on !i need an a or my mom is gonna kill me! 1. what three characteristics does grain perfect fabric have? 2. what do you need to know to identify your pattern layout on the guide sheet? 3. define: pressing 4. define: interfacing 5. define: design seam 6. when should you preshrink your fabric?
Answers: 1
Why do heated molecules rise? a Because they are less dense than the molecules around them b Because...
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