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3 years ago

Please help I will mark Brainly!

Chemistry

1 answer:

olga nikolaevna [1]3 years ago

8 0

I think C. Ionic compounds are very difficult to break apart because they are fully negative or positive charges, like magnets.

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Which statement defines specific heat capacity for given sample?

Aleks04 [339]

Answer:

D. the quantity of heat that is required to raise 1 g of the sample by 1*C (kelvin) at a constant pressure.

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3 years ago

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Compare the number of valence electrons in an atom of oxygen, o, with the number of valence electrons in an atom of selenium, se

Fiesta28 [93]

Oxygen and selenium both have 6 valence electrons. They're in the same group hope this helps

4 0

3 years ago

What is the half-life of a first-order reaction if it takes 4.4 x 102 seconds for the concentration to decrease from 0.50 M to 0

elena55 [62]

Answer: The half-life of a first-order reaction is, $3.3\times 10^2s$

Explanation:

All the radioactive reactions follows first order kinetics.

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = ?

t = time taken = 440 s

$[A_o]$ = initial amount of the reactant = 0.50 M

[A] = left amount = 0.20 M

Putting values in above equation, we get:

$k=\frac{2.303}{440s}\log\frac{0.50}{0.20}$

$k=2.083\times 10^{-3}s^{-1}$

The equation used to calculate half life for first order kinetics:

$t_{1/2}=\frac{0.693}{k}$

Putting values in this equation, we get:

$t_{1/2}=\frac{0.693}{2.083\times 10^{-3}s^{-1}}=332.69s=3.3\times 10^2s$

Therefore, the half-life of a first-order reaction is, $3.3\times 10^2s$

4 0

3 years ago

Can anyone break down it<br>just like 2nd picture and send me plz

Alona [7]

Answer:

this photo is very blur(￣ヘ￣;)

4 0

3 years ago

A toaster has a resistance of 28 Ω and is plugged into a 110 V circuit. Using the GRASS method, what current is measured?

BARSIC [14]

Answer:

The current of the toaster is 3.93A

Explanation:

Using the GRASS method:

G: Given: The information that is given is that we have 28Ω of Resistance and 110V of voltage.

R: Required: We need to find the current measured.

A: Action: We can use Ohm's law that relates resistance, voltage and current in the equation:

V = R*I

Or:

I = V/R

<em>Where I is current in A, V is voltage = 110V and R is resistance = 28Ω</em>

S: Solve:

I = 110V / 28Ω

I = 3.93A

S: Statement:

<h3>The current of the toaster is 3.93A</h3>

4 0

3 years ago