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3 years ago

What makes the periodic table arrangement so unique and useful?

1 answer:

8 0

Elements are ordered from left to right, increasing atomic number as they go. The periodic table allows us to find out and predict things about elements that haven’t been discovered yet!

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In a chemical equation, the new substance that is produced from a chemical reaction is called __________.

aleksandrvk [35]

Answer:

products

Explanation:

yeah the answer is product

6 0

3 years ago

Read 2 more answers

What item would you use to pour medium amounts of liquid

svp [43]

PVA glue or elmers glue PVA Glue does all the basics fairly well, and has all the binding ability you'd expect from an adhesive.

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4 years ago

Sodium carbonate can be prepared by heating sodium bicarbonate. 2 NaHCO3(s) ----> Na2CO3(s) + CO2(g) + H2O(g). Given that DHo

Likurg_2 [28]

Answer:

T = 401.6 K

Explanation:

Given reaction:

$NaHCO3(s) ----> Na2CO3(s) + CO2(g) + H2O(g)$

The thermodynamic parameters; ΔG°, ΔH° and ΔS° are related via the Gibbs -Helmholtz equation given as:

$\Delta G^{0}=\Delta H^{0}-T\Delta S^{0}----(1)$

For a given reaction, the gibbs free energy change ΔG° is related to the equilibrium constant K as:

$\Delta G^{0}=-RTln(K) ---(2)$

It is given that K = 1,

Therefore,

$\Delta G^{0}=-RTln(1) = 0$

Substituting for ΔG° in equation (1)

$0=\Delta H^{0}-T\Delta S^{0}$

$\Delta H = T\Delta S$

$T = \Delta H^{0}/\Delta S^{0}=\frac{128.9 kJ}{0.321 kj/mol-K}=401.6 K$

5 0

3 years ago

A new process converts potential energy of an object to kinetic energy. Neither work nor heat is added to the system. No reactio

MArishka [77]

Answer:

Change in height of the object

Explanation:

Change in height of the object

Since ,

We know potential energy can be written as mgh where

P.E. = mgh

M = mass ,

g = gravity constant

h = height

Kinetic energy can be written as 0.5 mv²

So , the Potential energy = kinetic energy

Then ,

velocity of object = √2 gh

Since g is a constant ,

Hence ,

Height of object will determine the velocity.

5 0

4 years ago

Answer true or false. A 163 g solution containing 8.0 mg of NaCl is 49 ppm. O True O False

beks73 [17]

Answer:

True

Explanation:

The unit ppm is parts per million.

In grams that is:

grams of solute in 1,000,000 grams of solution

Here, the solute is 8.0mg of NaCl. That is 0.0080g.

The solution is 163 g.

Then, set a proportion:

0.0080g NaCl / 163g solution = x / 1,000,000g solution

x = 1,000,000 g solution × 0.0080g NaCl / 163g solution

x = 49.08 ppm

Round to two significant figures = 49 ppm ← answer

6 0

3 years ago

What makes the periodic table arrangement so unique and useful?​

What makes the periodic table arrangement so unique and useful?