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3 years ago

The pH of an acid substance is between what values on the pH scale? A)0 and 4 B) 0 and 7 C) 7 and 14 D) greater than 14

Chemistry

1 answer:

cricket20 [7]3 years ago

7 0

B, THE PH OF ACID IS ALWAYS BETWEEN 0 AND 7, BUT REMEMBER THAT 7 IS NEUTRAL

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Word or symbol used to describe how data was measured

Orlov [11]

Answer:

Unit

Explanation:

Unit is used to describe how data is measured.

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3 years ago

Give an example of a substance that is MORE dense in its solid state when compared to its liquid state.

Natalka [10]

Answer: Wax

Explanation:

Density is defined as the mass contained per unit volume.

$Density=\frac{mass}{Volume}$

Usually solids are more denser than liquid, as molecules in solid are more strongly packed and thus have more mass per unit volume.

Liquids on the other hand contain molecules which are less tightly bound and thus thus contain less mass per unit volume as compared to solid.

Example: Solid wax is more denser than liquid wax.

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3 years ago

Two moles of ideal He gas are contained at a pressure of 1 atm and a temperature of 300 K. 34166 J of heat are transferred to th

iragen [17]

Explanation:

The given data is as follows.

n = 2 mol, P = 1 atm, T = 300 K

Q = +34166 J, W= -1216 J (work done against surrounding)

$C_{v}$ = $\frac{3R}{2}$

Relation between internal energy, work and heat is as follows.

Change in internal energy ( $\Delta U$ ) = Q + W

= [34166 + (-1216)] J

= 32950 J

Also, $\Delta U = n \times C_{v} \times \Delta T$

= $3R \times (T_{2} - T_{1})$

32950 J = $3 \times 8.314 J/mol K \times (T_{2} - 300 K)$

$\frac{32950}{24.942} = T_{2} - 300 K$

1321.06 K + 300 K = $T_{2}$

$T_{2}$ = 1621.06 K

Thus, we can conclude that the final temperature of the gas is 1621.06 K.

8 0

3 years ago

Be sure to answer all parts. Write an unbalanced equation to represent each of the following reactions: Do not include phase abb

Eva8 [605]

Answer: The unbalanced chemical equations are written below.

Explanation:

An unbalanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is not equal to the total number of individual atoms on the product side. These equations does not follow law of conservation of mass.