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Reika [66]
2 years ago
12

Cecil is working with samples of chlorine (Cl), oxygen (O), bromine (Br), and silver (Ag). The samples are all at room temperatu

re. Which substance is most likely the most dense?
Chemistry
1 answer:
Tpy6a [65]2 years ago
4 0

Answer:

itsy I just got the tests back and I got it right letterc

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What is the halflife of a radioisotope if a 20-g sample becomes 10g after 16 hours
ohaa [14]

Answer:

T½ = 16hours

Explanation:

Final mass (N) = 10g

Initial mass (No) = 20g

Time (t) = 16hours

T½ = ?

T½ = In2 / λ

But λ = ?

In(N/No) = -λt

In(10/20) = -(λ * 16)

In(0.5) = -16λ

-0.693 = -16λ

λ = 0.693 / 16

λ = 0.0433

Note : λ is known as the disintegration constant

T½ = In2 / λ

T½ = 0.693 / 0.0433

T½ = 16hours

The half-life of the sample is 16hours

5 0
2 years ago
when switch s is closed positive ions will undergo 1) oxidation at electrode B 2) oxidation at electrode A 3) reduction at elect
stepladder [879]

Answer:

reduction at electrode B

Explanation:

4 0
2 years ago
A graduated cylinder holds 100 mL of water. A lead weight is dropped into the cylinder bringing the new volume up to 450 mL. If
dolphi86 [110]

11.43g/mL

Explanation:

Given parameters:

Volume of water in the graduated cylinder = 100mL

Volume of water + lead weight = 450mL

Mass of lead weight = 4000g

Unknown:

Density of the lead weight = ?

Solution:

Density is the mass per unit volume of a body.

  Density  = \frac{mass}{volume}

Volume of the lead weight = volume of water displaced

 Volume of lead weight = 450 - 100 = 350mL

Density = \frac{4000}{350}  = 11.43g/mL

learn more:

Density brainly.com/question/2690299

#learnwithBrainly

6 0
2 years ago
The nutrition label on the back of a package of hotdogs (purchased within the US) indicates that one hotdog contains 100 calorie
Olenka [21]

Answer:

C. 100

Explanation:

Biochemical researches and studies have found out that an average health hotdog has a calorie of between 100 and 150 which is usually dependent on the additives.

Since the nutrition label on the back of a package of hotdogs (purchased within the US) indicates that one hotdog contains 100 calories then it truly contains such amount of calories. The standard number of calories present in a hotdog is independent of the amount eaten by individuals.

5 0
2 years ago
Which of the following is not a common use of gypsum? a. wallboard/drywall for homes b. a primary ingredient for toothpaste c. s
Nataliya [291]

Answer:

pH reducing agent for acidic soils

Explanation:

Gypsum is not used to reduce soil pH because it will displace the soil H+ but there's no means of extracting the H from the soil. So the pH of the soil remains the same.

3 0
2 years ago
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