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Aleks04 [339]
3 years ago
5

How does the number of coupons you use affect the amount of money you save?

Chemistry
1 answer:
slega [8]3 years ago
7 0
Using coupons seems like an old-fashioned, time-consuming way to save a few cents on the products you buy at the grocery store. After all, most coupons don't usually have a face value of more than $1 and, quite often, they're worth far less. But done properly, couponing can save you thousands of dollars every year.
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Evaluate each scenario described to determine the direction of heat flow.
LuckyWell [14K]

Answer: tap water to ice cube

Explanation:

3 0
3 years ago
The international space station (ISS) orbits in this layer of Earth's atmosphere.
garri49 [273]

Answer:

D thermosphere

Explanation:

The thermosphere is home to the International Space Station as it orbits Earth. This is also where you'll find low Earth orbit satellites

3 0
3 years ago
ΔH for the reaction below is -826.0 kJ/mol. Calculate the heat change when a 69.03-g sample of iron is reacted.4Fe(s) + 3 O2(g)
Anuta_ua [19.1K]

Answer:

c. -1020.9 kJ

Explanation:

4Fe (s) + 3 O₂ (g) --> 2 Fe₂O₃(s)         ΔH  =  -826.0 kJ/mol.

atomic weight of iron = 56

69.03 g = 69.03 / 56

= 1.23268 moles

Heat released by 1.23268 moles

= 1.23268 x 826.0

= -1020.9 kJ .

4 0
3 years ago
Atomic number of f^-1
victus00 [196]
The atomic number is 9 Ions have the same atomic number since atomic number signifies number of protons not electrons
7 0
3 years ago
There are ________ σ bonds and ________ π bonds in h3c-ch2-ch=ch-ch2-c≡ch.
FrozenT [24]
The number of sigma and pi bonds are,

          Sigma Bonds  =  16

          Pi Bonds         =   3

Explanation:
                   Every first bond formed between two atoms is sigma. Pi bond is formed when already a sigma bond is there. While in case of Alkyne (triple Bond) there is one sigma and one pi bond already present, so the third bond is formed by second side-to-side overlap of orbitals, hence, a second pi bond is formed.
Below all black bonds are sigma bonds, while in alkene there is one pi bond and in alkyne there are two pi bonds.

6 0
3 years ago
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