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mariarad [96]
1 year ago
13

Which substance is not a solid at 20˚C and one atmosphere of pressure?

Chemistry
1 answer:
levacccp [35]1 year ago
3 0
Choose A, Kr is noble gas
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Calculate the Cal(kcal) in 1 cup of whole milk: 12 g of carbohydrate, 9 g of fat, and 9 g of protein.
laiz [17]
 Fat: 1 gram = 9 calories    Protein: 1 gram = 4 calories    Carbohydrates: 1 gram = 4 calories    Alcohol: 1 gram = 7 calories"
So, (12 g carbohydrates)*4 Cal=48 Cal; (9 g fat) *9 Cal=81 Cal; (9 g protein)*4 Cal=36 Cal
48 Cal + 81 Cal + 36 Cal = 165 Cal in one glass of milk
5 0
3 years ago
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Balance the following reaction: AL2O3 + HCI ⇒ ALCI3 + H2O
Anastaziya [24]
To balance the following chemical equation, make a tally or a count of each of the atoms on both sides of the reaction, and make sure that those atoms are equal on both the reactant and product side.

AL2O3 + HCl => ALCl3 + H2O

Left side. Right side
AL = 2. AL = 1
O = 3 Cl = 3
H = 1. H = 2
Cl = 1. O = 1

First balance the metal atoms, aluminum, then hydrogen and then oxygen.

Balanced equation :
AL2O3 + 6HCl => 2ALCl3 + 3H2O.

Left side. Right side
AL = 2 AL = 2
O = 3 Cl = 6
H = 6 H = 6
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4 0
3 years ago
Why we need blood cholesterol?​
Rzqust [24]

Answer:

We need blood cholesterol because our body uses it to build your structure of cell membranes, make hormones like oestrogen, and testosterone, and to help your metabolism work well.

8 0
3 years ago
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Calculate the mass of O2 produced if 3.450 g potassium chlorate is completely decomposed by heating in presence of a catalyst (m
sergiy2304 [10]

The reaction is:

2 KClO3(s) → 3 O2(g) + 2 KCl(s) <span>

<span>A catalyst simply lowers the activation energy so MnO2 is not part of the overall reaction.

By stoichiometry: 

<span>3.45 g KClO3 x 1 mol/ 122.55g KClO3 x 3 mol O2/ 2 mol KClO3 x 31.99g/ 1 mol O2 = 331.096/ 245.1 = 1.35 grams O2 produced 

Answer:
1.35 grams O2</span></span></span>
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3 years ago
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Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles

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