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Schach [20]
3 years ago
14

Plz help me guys for 20 points 5th GRADE SCEINCE

Chemistry
2 answers:
nikitadnepr [17]3 years ago
6 0
Number 3 I'm fairly sure because forests compete environmentally by being animal homes but it would help to build homes for the economy
Usimov [2.4K]3 years ago
3 0
Option 3 using forest land to build homes
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8KCIO3 +1C12H22011
docker41 [41]

3.2 g KClO3

Explanation:

1.1 g C12H22O11 × (1 mol C12H22O11/342.3 g C12H22O11)

= 0.0032 mol C12H22O11

0.0032 mol C12H22O11 × (8 mol KClO3/1 mol C12H22O11)

= 0.026 mol KClO3

Therefore, the minimum amount of KClO3 needed is

0.026 mol KClO3 × (122.55 g KClO3/1 mol KClO3)

= 3.2 g KClO3

5 0
3 years ago
The atomic number is based on the number of protons.
chubhunter [2.5K]
It is the atomic mass because you add the protons and neutrons together to get this number
5 0
4 years ago
What's the pH of a solution composed of 0.2 moles of NH3 and 0.15 moles of nh4cl​
Norma-Jean [14]

Answer:

pH=4.63

Explanation:

Hello!

In this case, since the ionization of ammonia, which is a weak base, is written as:

NH_3+H_2O\rightleftharpoons NH_4^++OH^-

We can see that the ammonium ion is the conjugate acid whereas the hydroxide ions the conjugate base; that is why we use the Henderson-Hasselbach equation to compute the pH, given the pKb of ammonia 4.75:

pH=pKb+log(\frac{[conj\ acid]}{[base]} )

In such a way, for the given moles of ammonia, base, and those of ammonium chloride, conjugate acid form, we obtain:

pH=4.75+log(\frac{0.15}{0.2} )\\\\pH=4.63

Best regards!

8 0
3 years ago
Which describes the role of oxygen in photosynthesis and cellular respiration?
Marianna [84]

photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

4 0
4 years ago
Your mom is playing the drums in the basement. Whenever she hits the drum with all her force, the box next to the drums shakes,
snow_tiger [21]
It’s “a”, frequency because the sound waves will cause vibrations in object close by
3 0
4 years ago
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