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3 years ago

What are 5 physical changes in matter

Chemistry

1 answer:

Gennadij [26K]3 years ago

3 0

Answer:

cutting, bending, dissolving, freezing, and boiling

Explanation:

A physical change is a change in one or more physical properties of matter without any change in chemical properties. In other words, matter doesn't change into a different substance in a physical change. Examples of physical change include but are not limited to, from solid to liquid or from liquid to gas are also physical changes.

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Balance Na2CrO4 + AlPO4

Sonbull [250]

Answer:

2Na3PO4 + Al2(CrO4)3

Explanation:

these are the products

3 0

3 years ago

What is the pH of a 3.5 x 10-5 M solution of HCl?

kolezko [41]

Answer:

4.46

Explanation:

Applying,

pH = -log(H⁺)....................... Equation 1

Where H⁺ = Hydrogen ion concentration of HCl solution

From the question,

Given: H⁺ = 3.5×10⁻⁵ M

Substitute these values into equation 1

pH = -log(3.5×10⁻⁵)

pH = 4.46

Hence the pH of HCl solution is 4.46

4 0

3 years ago

Question 6 The mineral barite, (BaSO.) has a ke of 1.1 x 10" at 25°C. Calculate the solubility of barium sulfate in water, in: 6

Sav [38]

Explanation:

(6.1). The reaction equation will be as follows.

$BaSO_{4}(s) \rightleftharpoons Ba^{2+}(aq) + SO^{2-}_{4}(aq)$

Assuming the value of $K_{sp}$ as $1.1 \times 10^{-10}$ and let the solubility of each specie involved in this reaction is "s". The expression for $K_{sp}$ will be as follows.

$K_{sp} = [Ba^{2+}][SO^{-}_{2}]$ (Solids are nor considered)

= $s \times s$

s = $\sqrt{K_{sp}}$

= $\sqrt{1.1 \times 10^{-10}}$

= $1.05 \times 10^{-5}$

Therefore, solubility of barium sulfate in water is $1.05 \times 10^{-5}$ .

(6.2). As the molar mass of $BaSO_{4}$ is 233.38 g/mol

Therefore, the solubility is g/L will be calculated as follows.

$233.38 g/mol \times 1.05 \times 10^{-5}$

= $2.45 \times 10^{-3} g/L$

Therefore, solubility of barium sulfate in grams per liter is $2.45 \times 10^{-3} g/L$ .

8 0

3 years ago

The reaction between calcium carbonate (CaCO3) and HCl produces calcium chloride (CaCl2), carbon dioxide (CO2), and water (H2O).

Aleks [24]

The given chemical reaction is between calcium carbonate and hydrochloric acid to produce calcium chloride, carbon dioxide and water. This reaction can be represented as,

$CaCO_{3}(s) + 2HCl(aq)-->CaCl_{2}(aq)+H_{2}O(l)+CO_{2}(g)$

When the concentration of the reactants is increased, the number of collisions that take place between the reactant molecules increases. This speeds up the reaction. Therefore, when the concentration of HCl is doubled as long as there is enough calcium carbonate to react with HCl, the number of effective collisions giving products increases, this causes the rate of forward reaction to increase.

8 0

3 years ago

Laws differ from theories because laws do NOT provide what

max2010maxim [7]

Answer:

C. An Explanation

Explanation:

5 0

4 years ago