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pshichka [43]
3 years ago
9

Which statements about exothermic and endothermic reactions are correct? (its a multiple choice question)

Chemistry
1 answer:
geniusboy [140]3 years ago
5 0

Answer:

C)1 and 3 only☺️

Explanation:

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How many sulfur atoms would be present in 41.8 moles of sulfur?
Montano1993 [528]

Answer:

2.51 x 10*25 atoms

6 0
3 years ago
The state of matter in which a material has a definite shape and a definite volume is the _____ state.
Scilla [17]

Answer:

solid

Explanation:

in the solid state the material will has a fixed shape and volume whatever the container that contains it

where in liquid the shape will be different depending on the container

and in gas state the shape and volume are not definite

3 0
2 years ago
Which of the following represents a pair of isotopes?
Nonamiya [84]
B.
Isotopes is an atom has same number of electrons and protons but different number of neutron.
3 0
3 years ago
Which hydrocarbons are present in styrene?<br> a) alkene <br> b) alkyne<br> c) none of the above?
sleet_krkn [62]
Option a: alkene

Styren is C6H5CH=CH2, i.e. ethenylbenzene 
6 0
3 years ago
The Gateway Arch in St. Louis, MO is approximately 630 ft tall. How many U.S. half dollars would be in a stack of the same heigh
Paraphin [41]

Answer:

The number of half dollars in the stack of the height of the Gateway Arch in St. Louis is 89,313 half dollars

Explanation:

The given height of the Gateway Arch in St. Louis = 630 ft

The thickness of each half dollar = 2.15 mm

By conversion of factors, we have;

1 feet = 304.8 mm

Therefore;

630 ft. = 304.8 × 630 mm = 192,024 mm

The number of half dollars that will stack up to 630 ft or 192,024 mm, is therefore, given as follows;

The number, n, of half dollars in the stack of the height of the Gateway Arch in St. Louis = The height of the Gateway Arch in St. Louis/(The thickness of each half dollar)

n = 630 ft/(2.15 mm/(half dollar)) = 192,024 mm/(2.15 mm/(half dollar)) = 89,313.49 ≈ 89,313 half dollars

The number of half dollars in the stack of the height of the Gateway Arch in St. Louis = 89,313 half dollars.

6 0
3 years ago
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