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2 years ago

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Chemistry

1 answer:

Debora [2.8K]2 years ago

6 0

Answer:

chuma ya ndoshi.............

Explanation:

kwenda ukalale .............

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Its on the pic so plz look

Gre4nikov [31]

Answer:

Subscript

Explanation:

Hope this helps

3 0

3 years ago

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Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?

Vlad1618 [11]

Answer: option B.

carbon + oxygen → carbon dioxide

Explanation:

8 0

3 years ago

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A 2kg metal cylinder is supplied with 1600J of energy to heat it from 5*C to 13*C. What is the SHC of the metal?

gtnhenbr [62]

Answer:

100Jkg/°C

Explanation:

Given parameters:

Mass of metal = 2kg

Amount of heat energy = 1600J

Initial temperature = 5°C

Final temperature = 13°C

Unknown:

Specific heat capacity of the metal = ?

Solution:

Specific heat capacity of a body is the amount of heat needed to raise the temperature of unit mass of a body by 1°C.

H = m x C x (T₂ - T₁ )

H is the amount of heat

m is the mass

C is the unknown specific heat capacity

T is the temperature

Insert the parameters and solve;

1600 = 2 x C x (13 - 5)

1600 = 16C

C = 100Jkg/°C

3 0

3 years ago

Start with 100.00 mL of 0.10 M acetic acid, CH3COOH. The solution has a pH of 2.87 at 25 oC. a) Calculate the Ka of acetic acid

jasenka [17]

Answer: a) The $K_a$ of acetic acid at $25^0C$ is $1.82\times 10^{-5}$

b) The percent dissociation for the solution is $4.27\times 10^{-3}$

Explanation:

$CH_3COOH\rightarrow CH_3COO^-H^+$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= 0.10 M and $\alpha$ = ?

Also $pH=-log[H^+]$

$2.87=-log[H^+]$

$[H^+]=1.35\times 10^{-3}M$

$[CH_3COO^-]=1.35\times 10^{-3}M$

$[CH_3COOH]=(0.10M-1.35\times 10^{-3}=0.09806M$

Putting in the values we get:

$K_a=\frac{(1.35\times 10^{-3})^2}{(0.09806)}$

$K_a=1.82\times 10^{-5}$

b) $\alpha=\sqrt\frac{K_a}{c}$

$\alpha=\sqrt\frac{1.82\times 10^{-5}}{0.10}$

$\alpha=4.27\times 10^{-5}$

$\% \alpha=4.27\times 10^{-5}\times 100=4.27\times 10^{-3}$

5 0

3 years ago

What happens if you drink hydrogen peroxide?

ValentinkaMS [17]

When peroxide is swallowed, it generates oxygen bubbles in the stomach. Drinking higher concentrations of hydrogen peroxide can be very dangerous because it can cause tissue burns.

5 0

3 years ago