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4 years ago

10

The standard unit for measuring mass is the gram. a. True b. False

1 answer:

kifflom [539]4 years ago

6 0

True. It is the unit for measuring mass. :)

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Do all metal oxides produce alkaline solutions? explain why or why not?

ELEN [110]

Answer:

Forming acids and alkalis. Soluble metal oxides (or metal hydroxides) produce alkaline solutions. Soluble non-metal oxides produce acidic solutions. Insoluble oxides will not affect the pH of water.

Explanation:

8 0

3 years ago

What do the quantum numbers of electrons represent?

soldier1979 [14.2K]

It represents The number of subshells, or , describes the shape of the orbital. Itcan also be used to determine the number of angular nodes. The magnetic quantum number, ml, describes the energy levels in a subshell, and ms refers to the spin on the electron, which can either be up or down.

4 0

4 years ago

air is trasferred from 75 L tank where the pressure is 125 psi and the temperature is 288 K to a tire with a volume. of 6.1 L an

just olya [345]

Answer:

4.7K

Explanation:

Given parameters:

Initial volume = 75L

Initial pressure = 125psi

to atm gives 8.5atm

Initial temperature = 288K

New volume = 6.1L

New pressure = 25psi

to atm gives 1.7atm

Unknown:

New temperature = ?

Solution:

To solve this problem, we use the combined gas law which is given below:

$\frac{P1 V1}{T1}$ = $\frac{P2 V2}{T2}$

P, V and T are pressure, volume and temperature

1 and 2 are initial and new states

$\frac{8.5 x 75}{288}$ = $\frac{1.7 x 6.1}{T2}$

T2 = 4.7K

5 0

3 years ago

Which of the following is true about population and resources?

katrin [286]

Answer:

B.

People in the US use more resources per person than people in less developed countries

Explanation:

3 0

2 years ago

In a 1.2mM aqueous solution of butanoic acid C3H7CO2H, what is the percentage of butanoic acid that is dissociated? You can find

Alik [6]

Answer:

11% is the percentage of butanoic acid that is dissociated.

Explanation:

$HBu\rightleftharpoons H^++Bu^-$

Initially

c 0 0

At equilibrium

(c-cα) cα cα

Concentration of acid = c = [HBu] = 1.2 mM = 0.0012 M

Dissociation constant of butanoic acid = $K_a=1.51\times 10^{-5}$

Degree of dissociation = $\alpha$

Dissociation constant of an acid is given by:

$K_a=\frac{[Bu^-][H^+]}{[HBu]}$

$1.51\times 10^{-5}=\frac{(c\alpha )^2\times x}{(c -c\alpha )}$

$1.51\times 10^{-5}=\frac{c(\alpha )^2\times x}{(1-\alpha )}$

$1.51\times 10^{-5}=\frac{0.0012 M\time (\alpha )^2}{(1-\alpha )}$

$\alpha = 0.1060\approx 0.11 =11\%$

11% is the percentage of butanoic acid that is dissociated.

4 0

3 years ago