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ehidna [41]
3 years ago
5

Henry is in the community investigating sources of chemical energy for his science experiment. Select the best examples of chemi

cal energy Henry can use.
A gas station and people playing hopscotch
A squirrel eating acorns and a fire burning
Someone reading a book and eating a sandwich
Someone sliding down the slide and someone drinking water
Chemistry
2 answers:
djverab [1.8K]3 years ago
8 0
B it seems as a fire is better then the rest
Julli [10]3 years ago
6 0

Explanation:

Determine whether the following symbols are universal or contextual. In "The Nightingale and the Rose,"

Oscar Wilde uses a red rose as a symbol for love. In To Kill a Mockingbird, Harper Lee uses a mockingbird as a symbol for innocence.

In A Little Princess, Frances Hodgson Burnett uses hot buns as a symbol for the connection between the main character and a poor street child.

In "The Water of Life," the Brothers Grimm use water as a symbol for life.

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A student dissolved 5.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution
Marianna [84]

Answer:

0.136g

Explanation:

A student dissolved 5.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are there in the final solution?

Co(NO_3)_2(aq)\rightarrow Co^{2+}(aq)+2NO_3^{-}(aq)

Initial mole of Co(NO3)2  =\frac{mass}{molar mass}

=\frac{5.00}{182.94} \\\\=0.02733mol

Mole of Co(NO3)2 in final solution

=\frac{4.00}{100}\times 0.02733\\\\=0.04\times 0.02733\\\\= 0.001093mol

Mole of  NO3- in final solution = 2 x Mole of Co(NO3)2

=2\times 0.001093\\\\=0.002186mol

Mass of  NO3- in final solution is mole x Molar mass of NO3

=0.002186\times62.01\\\\=0.136g

6 0
4 years ago
(1.7m - 2) + (2m – 4)
Pavel [41]

Answer: 3.7 m − 6

Explanation: Simplify the expression.

brainliest or a thank you pls :)) <3

6 0
3 years ago
PLEASE HELP ASAP!!!
kogti [31]
1 CH4 (g) + 2 O2 (g) -----> CO2 (g) + 2H2O(l) ΔH= - 890 kJ
1 mol           2 mol
1)  If ΔH has minus, it means "release". We need only "release" choices.<span>
2) From reaction
1 mol </span>CH4 (g)  "releases"  ΔH= - 890 kJ  - We do not have this choice.

2 mol  O2 (g)   "release" ΔH= - 890 kJ, so
1 mol  O2 (g)   "release" ΔH= - 445 kJ
Correct answer is B.
3 0
3 years ago
Read 2 more answers
22 Which of the following statements is true for all loving organisms? A. All living organisms are made of one or more cells wit
Klio2033 [76]
The answer is C. No all cells have cell walls. Prokaryotes don’t have a nucleus or chloroplast. Leaving C to be correct
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3 years ago
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A science student observes that a dissolvable antacid tablet acts faster in relieving stomach pain when taken with warm water th
LekaFEV [45]

Answer:the medication would not last as long

Explanation:

Because of the desolving of the tablet so quickly it would

4 0
4 years ago
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