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Vika [28.1K]
3 years ago
13

??????????????? why ????????????????

Chemistry
2 answers:
Svetllana [295]3 years ago
8 0

Answer:

because

Explanation:

life sucks

stealth61 [152]3 years ago
4 0

Answer:

because

Explanation:

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Round off the following measurement to three significant figures. 1.296 g
REY [17]
It would be 1 or 2 because if the number is higher than 5 you need to round up , if its lower than 5 you need to round down.

7 0
3 years ago
The antibiotic doxycycline is used to treat Lyme disease. A 100 mg dose of the antibiotic consists of 59.5 mg of C, 5.40 mg of H
never [62]

Answer:

C₁₁H₁₂NO₄

Explanation:

In order to determine the empirical formula of doxycycline, we need to follow a series of steps.

Step 1: Determine the centesimal composition

C: 59.5 mg/100 mg × 100% = 59.5%

H: 5.40 mg/100 mg × 100% = 5.40%

N: 6.30 mg/100 mg × 100% = 6.30%

O: 28.8 mg/100 mg × 100% = 28.8%

Step 2: Divide each percentage by the atomic mass of the element

C: 59.5 /12.0 = 4.96

H: 5.40/1.00 = 5.40

N: 6.30/14.0 = 0.450

O: 28.8/16.0 = 1.80

Step 3: Divide all the numbers by the smallest one

C: 4.96/0.450 = 11

H: 5.40/0.450 = 12

N: 0.450/0.450 = 1

O: 1.80/0.450 = 4

The empirical formula of doxycycline is C₁₁H₁₂NO₄

5 0
3 years ago
Will give brainliest this is simple plz help
julsineya [31]

Answer:

IIron is the 26th element on the periodic table. It is located in period 4 and group 8. And for the properties, iron, like other metals, conducts heat and electricity, has a luster, and forms positive ions in its chemical reactions. Pure iron is fairly soft and can easily be shaped and formed when hot. Its color is silvery white. Iron is easily magnetized.

Explanation:

4 0
3 years ago
I need help solving this chemistry question ​
Arturiano [62]

Answer:

I think the answer is 22.2

Explanation: What i DID was adding 12.0 + 10.0 and than that gave me 22 the I had added the to 0.200 and that how i got 22.2. Sorry if i got is wrong. :(

3 0
3 years ago
PLEASE ANSWER ASAP
Sergio [31]

Answer:

Low level (altitude) clouds that are wispy and made of ice crystals.

precipitation and surface runoff

Hail

Nitrogen

Stratosphere

Decreases

Please Award Brainliest!

7 0
2 years ago
Read 2 more answers
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