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Alenkinab [10]
3 years ago
11

What words do you use in a hypothesis

Chemistry
1 answer:
Misha Larkins [42]3 years ago
6 0

Answer:

"If________, then _______ will happen because ________.

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What is 50% of 90??​
Alekssandra [29.7K]

Answer:

45

Explanation:

50% = 1/2

one half of 90 is 45

4 0
3 years ago
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I need help with this
ipn [44]
Can’t see it properly:(
6 0
3 years ago
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What is the density of 2 mol of (He) at STP? (Show work and explain, please!!!)​
Svetradugi [14.3K]

Answer:

d = 1.8 × 10⁻⁴ kg/L

Explanation:

Given data:

Moles of helium = 2 mol

Temperature and pressure = standard

Density = ?

Solution:

PV = nRT

V = nRT/ P

V = 2 mol × 0.0821 atm. L/ mol. K × 273 K / 1 atm

V = 44.8 L

Mass of helium:

Mass = number of moles  × molar mass

Mass = 2 mol × 4 g/mol

Mass = 8 g

Mass = 0.008 kg

Density;

Density = mass/ volume

d = 0.008 kg/ 44.8 L

d = 1.8 × 10⁻⁴ kg/L

7 0
4 years ago
Dehydrohalogenation of 1-chloro-1-methylcyclopropane affords two alkenes (A and B) as products.
UNO [17]

Explanation:

Dehydrohalogenation reactions occurs as elimination reactions through the following mechanism:

Step 1: A strong base(usually KOH) removes a slightly acidic hydrogen proton from the alkyl halide.

Step 2: The electrons from the broken hydrogen‐carbon bond are attracted toward the slightly positive carbon (carbocation) atom attached to the chlorine atom. As these electrons approach the second carbon, the halogen atom breaks free.

However, elimination will be slower in the exit of Hydrogen atom at the C2 and C3 because of the steric hindrance by the methyl group.

Elimination of the hydrogen from the methyl group is easier.

Thus, the major product will A

4 0
3 years ago
Which element is a halogen and has a larger average atomic mass than arsenic (As)?
olganol [36]
Answer:
              Iodine (I)

Explanation:
                    The atomic mass of Arsenic (As) is 74.92 amu. Also, we know that Halogen Group consists of following elements.

           Fluorine, Chlorine, Bromine, Iodine, Astatine and Tennessine

And in given four options only Chlorine and Iodine belongs to halogen family. And we know that the atomic mass of chlorine is 35.45 amu which is less than that of Arsenic, therefore Iodine with atomic mass of 126.90 amu is the correct answer.
3 0
3 years ago
Read 2 more answers
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