Why can't alpha particles penetrate deeply into solids?
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In the world of chemistry a mole is a number of something a very large number of something.Just as a dozen is 12 of something a mole is about 6.02*10^23 of something.In chemistry we like the number of atoms or molecules in moles.If one mole is equal to 6.02*10^23 atoms and you have 9.00 *10^23 atoms then how many moles do you have?
Element X has five valence electrons, element Y has one valence electron, and element Z has five valence electrons. Which two of these elements are most likely to have similar properties? Explain your answer
Express the answer in scientific notation and with the correct number of significant figures: (6.32 x 10-4) ÷ 12.64
A particle has 5 protons, 6 neutrons, and 5 electrons. What is its net charge.
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Answer: If you have a crush on someone, it can be difficult to decide whether to express your feelings or not. There are no hard and fast rules, but here are some things to consider:
Assess your feelings: Before you decide to act on your crush, it’s important to take some time to reflect on your feelings. Ask yourself why you like this person and what you hope to gain from expressing your feelings. Be honest with yourself about your motivations and expectations.
Consider the risks: While expressing your feelings can be exciting, it can also be risky. You may face rejection or damage an existing friendship. Think about how you would feel if the other person doesn’t feel the same way.
Think about timing: Timing is important when it comes to expressing your feelings. You don’t want to catch the other person off guard or put them in an awkward position. Consider whether this is a good time for both of you.
Be respectful: If you do decide to express your feelings, make sure you do so in a respectful way. Be honest but also considerate of the other person’s feelings.
Be prepared for any outcome: No matter what happens, be prepared for any outcome. If the other person doesn’t feel the same way, try not to take it personally. Remember that there are plenty of other people out there who would be lucky to have you in their life.
I hope this helps! Let me know if there’s anything else I can do for you.
Answer: Ask them
Explanation:
If you miss your chance you might regret it.
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Answer:
Mole fraction = 0,0166
Explanation:
Mole fraction is defined as mole of a compound per total moles of the mixture. In the solution, the solute is fructose and the solvent is water. That means you need to find moles of fructose and moles of water.
The molecular mass of fructose is 180,16g/mol and mass of water is 18,02 g/mol. Using these values:
91,7g fructose × (1mol / 180,16g) = 0,509 moles of fructose
545g water × (1mol / 18,02g) = 30,24 moles of water
Thus, mole fraction of fructose is:
Mole fraction = 0,0166
I hope it helps!
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Human Movement is important because it most commonly used to insure optimal athletic ability. It can also be used to identify the cause of most common sports injuries and movement-related problems. The name for this type of study is called Kinesiology. This is a very necessary part of students understanding dance, sports, and physical well-being. Studying Kinesiology results in better physical performance, as well as many cardiovascular improvements. Kinesiology is used to answer many still unknown question about human movement.
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NaCl is 1:1, while H2O is 2:1.
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IF there is a decrease in the temperature at the equator then it is possible that there is an increase in the speed of current.
H20(g)
1. Balance the equation above by putting coefficients into each blank space.
1C5H12+ 8O2----- 5CO2+ 6 H2O (this is what I got)
2. How many atoms of oxygen are in 144 grams of pentane?
step 1: 144g of C5H12*(1mole/72.17)= 1.995moles of C5H12
step 2: 1.995moles of C5H12*(8moles of O2/1mole of C5H12)= 15.962 moles of O2
step 3: 15.962 moles of O2*(6.02*10^23 atoms of O2/1mole of O2)= 9.609*10^24 atoms of O2 (I don't know if I did this right)
3. How many atoms of oxygen are in 192 grams of carbon dioxide gas?
step 1: 192 grams of CO2 *(1mole of CO2/44.01grams of CO2)= 4.363 moles of CO2
step two: 4.36moles of CO2* ( 1 mole of O2/1mole of CO2)=
step 3: 4.363* (6.02*10^23) = 2.627*10^24 atoms of O2 (I don't know if this is correct.
4. A) CIRCLE ONE: True or False:
reactant you begin with fewer grams of is your limiting reactant.
B) If 32 g of oxygen gas and 32 g of pentane are combined, how much water will be produced, in moles? (Use your reaction from the top of the first page)
NEED HELP ASAP THANK YOU!!!
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2) Step 1: Moles=Mass/Mr, so it's 144/72= 2mol
Step 2: Stoichiometry means the ratio of oxygen to pentane is 1:8 so moles of oxygen is moles of pentane times 8. 2*8=16mol of oxygen
Step 3: 16= 9.6*10^24
3) The ratio of oxygen to carbon in CO2 is 1:2
so it's 192/3 = 64
64*2=128g
Moles = Mass/Mr = 128/32 = 4mol = 2.41*10^24 atoms of oxygen
Basically you needed to work out the mass of oxygen using ratios before using a moles equation instead of just working with moles
4) True
5) 1C5H12+ 8O2----- 5CO2+ 6 H2O
32g 32g
Moles of oxygen = Mass/Mr = 32/32= 1mol so you'd need 0.125mol of pentane to react fully
Moles of pentane= Mass/Mr = 32/72=0.4mol so you'd need 3.2mol of oxygen to react fully
This makes oxygen the limiting factor, because you need more of it to react fully with the pentane, so we use oxygen
Stoichiometry means for every 8mol of oxygen there's 5mol of CO2
So, 1/8*5=0.635mol of CO2