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3 years ago

When water turns to ice does it add or take away energy?

1 answer:

3 0

It takes away energy, when water is in liquid form the atoms slide past each other, when frozen, the atoms get close together and do not move.

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What does the symbol ka mean in chemistry?

Dmitry_Shevchenko [17]

<span>Ka is an equilibrium constant for the partial ionization of "weak" acids in water.</span>

4 0

4 years ago

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A certain compound is made up of one phosphorus (P) atom, three chlorine (Cl) atoms, and one oxygen (O) atom. What is the chemic

yulyashka [42]

Answer: PCl₃O

Explanation:

1) The chemical formula tells the composition of a compound in terms of the ratio of number of atoms of each element that consitutes such compound.

2) You use the chemical symbol for each kind of atom (element) and subscripts to the right of each symbol to tell the number of atoms of each element.

3) For example, O₂ means two atoms of oxygen. Al₂O₃ means two atoms of aluminum and 3 atoms of oxygen.

4) Therefore, PCl₃O means a ratio 1 : 3 : 1 for phosphorus, chlorine, and oxygen.

Hence, PCl₃O is the chemical formula of your compound.

3 0

3 years ago

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A student is preparing to perform a series of calorimetry experiments. She first wishes to determine the calorimeter constant (C

Maru [420]

Explanation:

The given data is as follows.

$V_{1}$ = 50 ml, $T_{1}$ = 345 K

$T_{2}$ = 298 K, $T_{f}$ = 317 K,

$V_{2}$ = 50 ml

Now, we will calculate the heat energy as follows.

$Q_{hot} = m \times C_{p} \times (T_{1} - T_{f})$

= $50 g \times 4.184 \times (345 - 317)$

= 5857.6 J

$Q_{cold} = m \times C_{p} \times (T_{f} - T_{2})$

= $50 g \times 4.184 \times (317 - 298)$

= 3974.8 J

As, $Q_{hot} = -Q_{cold}$ so there will be loss of heat. And, some heat will go to the calorimeter.

Hence, $Q_{hot} = Q_{cold} + Q_{cal}$

$5857.6 = 3974.8 + Q_{cal}$

$Q_{cal}$ = 1882.8 J

We assume that the temperature of (calorimeter + water) is 298 K. Hence,

dT = $T_{f} - T_{2}$

= (317 - 298) K

= 19 K

Hence, we will calculate the specific heat as follows.

C = $\frac{Q}{dT}$

= $\frac{1882.8 J}{19}$

= 99.1 J/K

Thus, we can conclude that the value of $C_{cal}$ for the calorimeter is 99.1 J/K.

3 0

4 years ago

List the 5 chemicals with the highest flash point. (In order, staring with the highest)

Volgvan

Answer:

Flash point of Lube Oil is around the 187°C mark,

Flash point of Biodiesel of 130°C

Flash point of Diesel Ranging from 52° to 96°

8 0

4 years ago

All of the statements are true about the arrangement of elements in the periodic table EXCEPT that the

LUCKY_DIMON [66]

Answer: C) rare earth elements are in the first column, on the left.

Explanation:

In fact, rare earth elements are in the third column, on the left.

The periodic table of the elements is an arrangement of the chemical elements in the form of a table, ordered by their atomic number (number of protons), by their configuration of electrons and their chemical properties. It was progressively developed over time as the scientific knowledge advanced; for this reason many modifications and corrections might be done in the future.

This table is divided into rows and columns, which represent the periods and groups or families. For its location the atomic number and valence of each element was considered.

In this sense, the elements in the periodic table are mainly arranged as follows:

-Alkali metals and Alkaline Earth metals in the first two columns, on the left.

-Rare earth elements in the third column (rows 6 and 7), on the left.

-Transition metals in the center.

-Basic metals and semi-metals to the right

-Non-metals to the right (and Hidrogen in the first row and column)

-Noble gases (or inert gases) farthest to the right.

3 0

3 years ago

Read 2 more answers