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ivann1987 [24]
2 years ago
7

Answer this correctly please...

Chemistry
1 answer:
Iteru [2.4K]2 years ago
6 0

Answer:

1. B

2. C

3. B or D

6. A

7. D

8. A

9. A

Explanation:

Brainliest plz answered to the best of my abilitys

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List any two uses of Brass , Bronze , Sulphur , Iodine
NikAS [45]

BRASS :It is easy to form into various shapes, a good conductor of heat, and generally resistant to corrosion from salt water. 1 pipes and 2 tubes, 3 screws, 4 cartridge casings for firearms.

BRONZE :for bearings because of its friction properties, and as 1 musical instruments ,2 and medals

Sulphur :1 making car batteries, 2 fertilizer

IODINE :1 Iodine regulates skin moisture levels and aids in the healing of cuts and scars through cellular regeneration. 2 Iodine also regulates the hormones responsible for acne breakouts.3 Treating thyroid cancer.

5 0
3 years ago
A bumblebee flies with a ground speed of 15.0 m/s . Calculate its speed in km/h.
zheka24 [161]
Speed in km/hr = 15 x 18
                            ------------
                                 5
             
                          =   54 km/hr.

Hope this helps!

5 0
3 years ago
Read 2 more answers
in the laboratory a student dilute 13.3 ml of a 10.8 m hcl solution to a total of 300.0 ml what is the concentration of the dilu
krek1111 [17]

<u>Answer:</u> The concentration of the diluted solution is 0.4788M

<u>Explanation:</u>

To calculate the concentration of the diluted solution, we use the following equation:

M_1V_1=M_2V_2

where,

M_1\text{ and }V_1 are the molarity and volume of HCl solution

M_2\text{ and }V_2 are the molarity and volume of the diluted HCl solution.

We are given:

M_1=10.8M\\V_1=13.3mL\\M_2=?M\\V_2=300mL

Putting values in above equation, we get:

10.8\times 13.3=M_2\times 300\\\\M_1=0.4788M

Hence, the concentration of the diluted solution is 0.4788M

6 0
3 years ago
If a substance has a density of 2.545g / mL how many grams would the substance weigh if the sample has a volume of 122.1 mL?
grin007 [14]

Answer: 310.7 grams

Explanation:

Multiply the two values so the units of mL cancel and you get grams

2.545*122.1 = 310.7 grams

4 0
3 years ago
How many moles of hydrogen are in 5.2 moles of C7H18
maksim [4K]
In one mole of C7H18 there are 18 moles of H (the number folowing the H)*
>> the ratio is 1:18

In 5.2 moles of C7H18 there are x moles of H
>> the ratio is 5.2:x

Cross multiply the two ratios
1x = 18×5.2
x = 93.6 moles of H

>> In 5.2 moles of C7H18 there are 93.6 moles of H




* This isnt a rule that you can always use.
However to find the mole of a certain element in a certain molucle all you have to do is count how many moles of the element are present in the molecule.
>> example1 >> H2O ;
2 H and 1 O

>> example2 >> CH3COOH ; [you add up all the moles of the same element]
(1+1) 2 C , (3+1) 4 H and (1+1) 2 O

>> example3 >> Mg(OH)2 ; [you multiply whetever is in parenthesis by the number after it 2] 1 Mg , (1×2) 2 O and (1×2) 2 H
6 0
3 years ago
Read 2 more answers
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