All categories

4 years ago

Both the brain and the spinal cord are protected by _____.

Chemistry

2 answers:

patriot [66]4 years ago

6 0

It is a watery fluid called <span>cerebrospinal fluid. Answer C :)
</span>

nikklg [1K]4 years ago

4 0

Hello,

Both the brain and the spinal cord are protected by _____.
C.a watery fluid

hope ly answer help you
have a wonderful day
if u might giving me a brainliest please
bye..

You might be interested in

Please help!!

viva [34]

Answer:

Answer is 2nd

Explanation:

some energy is transformed into mass

5 0

3 years ago

An organic acid was analyzed and the following percent composition was obtained: 68.85% carbon, 4.9% hydrogen, and 26.2% oxygen.

rewona [7]

Answer:

The molecular formula of the compound is: C14H12O4

Explanation:

Step 1: find molality

ΔT = Kf x m

ΔT = Tfinal - Tinitial = 3.37 - 5.50 = -2.13

molality (m) = ΔT/Kf = -2.13/-5.12 = 0.416 m

step 2: find number of moles

m = number of moles (n)/Kg solvent which is the benzene

n = molality x Kg solvent = 0.416 molality X (10 x 10^-3 Kg) = 0.00416 mole

Step 3: find molecular mass of the organic compound

n = mass/Molecular mass = m/Mm

Mm = m/n = 1.02/0.00416 = 245.19 g/mole of organic compound molecular formula

Step 4: find number of mole of each compound

let consider it being in 100g where each % will correspond to the mass of the element in 100g of the compound.

C = mass/molar mass = 68.85/12.01 = 5.7327 mole

H = mass/molar mass = 4.9/1.01 = 4.8515 mole

O = mass/molar mass = 26.2/16 = 1.6375 mole

Step 5: divide by smallest number of mole

C = 5.7327/1.6375 = 3.5 = 7/2

H = 4.8515/1.6375 = 3

O = 1.6375/1.6375 = 1

C7/2H3O1

multiply by two to remove the fraction: C7H6O2 in which the empirical molecular mass = 122.13 g/mole

to find the factor for the molecular formula x = Mm of molecular/Mm of empirical = 245.19/122.13 = 2

Multiply the empirical by 2 = 2 x (C7H6O2) = C14H12O4

8 0

4 years ago

Which equation obeys the law of conservation of mass? A. 2C4H10 + 2Cl2 + 12O2 7CO2 + CCl4 + 10H2O B. C4H10+ Cl2 + 2O2 7CO2 + CCl

Reptile [31]

Answer : The correct option is A.

Explanation :

Law of conservation of mass : In the chemical reaction, the mass of reactant must be equal to the mass of product.

A. $2C_4H_{10}+2Cl_2+12O_2\rightarrow 7CO_2+CCl_4+10H_2O$

The mass of reactant side = $2C_4H_{10}+2Cl_2+12O_2=[8(12)+20(1)]+4(35.5)+24(16)=642g$

The mass of product side = $7CO_2+CCl_4+10H_2O=7(12)+14(16)+12+4(35.5)+20(1)+10(16)=642g$

This means, the mass of product is equal to the mass of reactant. The mass remains conserved and obeys the law of conservation of mass.

The reaction B, C, D, E does not obey the law of conservation of mass.

Therefore, Only reaction A obey the law of conservation of mass.

7 0

4 years ago

Describe how you would prepare exactly 80 ml of a 0.2 M solution of glycerol in water. The molecular weight of glycerol is 92.1

poizon [28]

You would ask bill nye he prolly know

3 0

3 years ago

Calculate the pH of a solution that is 0.113 M HCI.

Alex Ar [27]

Simplified concentration

$\\ \rm\Rrightarrow 1.13\times 10^{-2}M$

Now

$\\ \rm\Rrightarrow pH=-log[H^+]$

$\\ \rm\Rrightarrow pH=-log(1.13\times 10^{-2})$

$\\ \rm\Rrightarrow pH=-log1.13-log10^{-2}$

$\\ \rm\Rrightarrow pH=-0.05+2$

$\\ \rm\Rrightarrow pH=1.95$

Highly acidic

6 0

2 years ago