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GrogVix [38]
3 years ago
7

1.what do many scientists believe contributed to the extinction of the dinosaurs

Chemistry
2 answers:
inysia [295]3 years ago
5 0
1) A
2) B
3) and i am not 100% sure about this one but I think that it is B idk tho
PtichkaEL [24]3 years ago
4 0
1) A
2) D
3) C
Hope these help!
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What is the empirical formula of a carbon-oxygen compound, given that a 95.2 g sample of the compound contains 40.8 g of carbon
algol [13]

Answer:

95.2 - 40.8 = 54.4 g of oxygen

number of moles = mass (g)/ Mr

no. of moles of carbon = 40.8/12 = 3.4

no. of moles of oxygen = 3.4

divide both by smallest value which is 3.4 and you’ll get 1 mole of carbon and 1 mole of oxygen therefore the empirical formula is CO

Explanation:

hope this helps :)

4 0
3 years ago
If a reaction releases 675,000 Joules, how many kcal does it release?
Mamont248 [21]

Answer: If a reaction releases 675,000 Joules then it means it releases 161.328872 kcal.

Explanation:

According to the standard conversion,

1 Joule = 0.000239006 kcal

Therefore, 675,000 Joules will be converted into kcal as follows.

1 Joule = 0.000239006 kcal\\675,000 J = 675000 J \times \frac{0.000239006 kcal}{1 J}\\= 161.328872 kcal

Thus, we can conclude that if a reaction releases 675,000 Joules then it means it releases 161.328872 kcal.

5 0
3 years ago
Which of the following is a renewable resource?
spayn [35]

Answer:

Wind

Explanation:

Wind is renewable because we have an unlimited amount unlike coal, oil, and natural gas.

7 0
4 years ago
Read 2 more answers
Explain how acid–base indicators can be used to determine the approximate pH of a substance.
mezya [45]
PH stands for potential hydrogen.
pH can be accurately tested using acid-based indicators since it is a part of the pH of something itself. (acid and bases) The indicators themselves work when the acidic properties of the indicator begins to dissolve and form ions which gives the color indicating the pH.


5 0
3 years ago
I need those two questions answered!!!!help please
Zepler [3.9K]

Answer:

The answer to number 32 is hydrosphere

Explanation: Hope this helps hon!

6 0
3 years ago
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