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3 years ago

What is one way to test weather an unknown solution is acidic or basic ?

Chemistry

1 answer:

alisha [4.7K]3 years ago

5 0

Use indicators such as :

Indicator Color in acid Color in alkali

<em>methy lorange</em> red yellow

<em>phenolphthalein</em> colorless pink

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Energy from the sun provides fuel for entire ecosystems true or false

Gekata [30.6K]

Answer: True

Explanation:

7 0

3 years ago

If the volume of oxygen gas is 259 cm3 at 112 kPa, what would the volume be at 101.3 kPa?

NARA [144]

Answer:

<h3>The answer is 286.36 cm³</h3>

Explanation:

In order to find the volume be at 101.3 kPa we use Boyle's law which is

$P_1V_1 = P_2V_2$

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

$V_2 = \frac{P_1V_1}{P_2} \\$

From the question

P1 = 112 kPa = 112000 Pa

V1 = 259 cm³

P2 = 101.3 kPa = 101300 Pa

We have

$V_2 = \frac{112000 \times 259}{101300} = \frac{29008000}{101300} \\ = 286.3573543...$

We have the final answer as

Hope this helps you

6 0

3 years ago

Why does electronegativity decrease from right to left within a period?

Firlakuza [10]

Explanation:

so, as you move down a group on the periodic table, the electronegativity of an element decreases because the increased number of energy levels puts the outer electrons very far away from the pull of the nucleus. electronegativity increases as you move from left to right across a period on the periodic table.

4 0

3 years ago

Balance the following chemical reactions:

Tcecarenko [31]

1. 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

2. CH₄ + 2O₂ → CO₂ + 2H₂O

3. Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

4. MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂

5. Pb(NO₃)₂ + 2NaCl → PbCl₂ + 2NaNO₃

$NaCl+AgNO_3=>NaNO_3+AgC\downarrow$