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OverLord2011 [107]
2 years ago
13

Jamie grinds his teeth at night, so his dentist suggested wearing a mouth guard. After wearing the mouth guard for two weeks Jam

ie noticed that his jaw no longer hurt during the day.  About two weeks later, Jaime’s parents received a call from the dentist’s billing department, who indicated that their insurance did not cover the cost of the mouth guard.  A __________ effect is that Jaime’s jaw no longer hurts during the day. A ___________ effect is that his parents’ health insurance did not cover the cost of the mouth guard. a.
positive; negative
b.
negative; positive
c.
negative; negative
d.
positive; positive
Chemistry
1 answer:
slavikrds [6]2 years ago
3 0
The answer is a. Positive; Negative.
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The formula for a compound of Li₊ ions and Br_ ions is written LiBr. Why can't it be written Li₂Br? Why isn't it written BrLi?
bogdanovich [222]

Answer:

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Explanation:

Lithium is in the first column of the periodic table, so it will have 1 valence electron.

Bromine is in the seventh column of the periodic table, so it will have seven valence electrons.

They must combine in a way to reach 8.

When combining elements to form compounds, the "crisscross method" is used. Above Li would be a charge of +1, and above Br would be a charge of -1.

Cross the 1 from the top of Li to the bottom of Br, and so there is 1 Br.

Cross the 1 from the top of Br to the bottom of Li, and so there is 1 Li.

It is not written BrLi because chemists decided to order them the other way. Technically speaking, it isn't wrong, but the positive charge is normally put on the left and the negative charge is normally put on the right.

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3 years ago
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2. Why can we eliminate the claim you circled?
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Answer: theres no image or claim

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Model B: In this model the atom is a solid sphere that cannot be divided up into smaller
vivado [14]

Answer:

They are called corpuscles

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3 years ago
Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?
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Answer:

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3 years ago
Olympic cyclists fill their tires with helium to make them lighter. Assume that the volume of the tire is 860 mL , that it is fi
nata0808 [166]

Answer:

a)  the mass of air = 8.24 grams

b) the mass of helium = 1.14 grams

c) the mass difference = 7.10 grams

Explanation:

Step 1: Data given

Volume of the tire = 860 mL

Total pressure = 120 psi

Temperature = 26°C

molar mass of air = 28.8 g/mol

Step 2:  Convert psi to atm

(

120 psi) (1 atm / 14.7 psi) = 8.163

Step 4: Calculate moles

PV = nRT

 ⇒ with P = the pressure = 8.163 atm

⇒ with V = the volume = 860 mL = 0.860 L

⇒ with n = the number of moles = TO BE DETERMINED

⇒ with R = the universal gas constant = 0.08206 L*atm/K*mol

⇒ with T = the temperature = 26 °C = 299 Kelvin

n = (8163*0.860)/(0.08206*299)

n = 0.2861 moles of gas

Step 5: Calculate the mass of air in an air-filled tire.

Mass = moles * molar mass

Mass = (0.2861 moles of gas) (28.8 g/mol)  

Mass = 8.24 grams

Step 6: Calculate the mass of helium in a helium- filled tire.

mass of helium = 0.2861 moles of gas * 4 g/mol)  

mass of helium  = 1.14 grams

Step 7: What is the mass difference between the two?

Δmass=  8.24 grams -  1.14 grams

Δmass= 7.10 grams

8 0
3 years ago
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