3 years ago

HELPPP PLEASE !/!/!/!/!/!/!/!

Chemistry

1 answer:

eduard3 years ago

6 0

Answer:

the second question should be along the staircase

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Based on their descriptions, classify these chemical changes as endothermic or exothermic.

Pavlova-9 [17]

_Award brainliest if helped!
1. Endothermic
2. Exothermic
3. Exothermic
4. Exothermic
5. Endothermic

(Endothermic absorbs energy (heat) from the surrounding making surrounding cooler, and vice versa for exothermic.)

3 0

3 years ago

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addition of sulfurous acid (a weak acid) to barium hydroxide ( a strong base) results in the formation of a precipitate. The net

Trava [24]

net ionic equation:

SO₄²⁻ (aq) + Ba²⁺ (aq) → BaSO₄ (s)

Explanation:

We have the following chemical reaction:

H₂SO₄ (aq) + Ba(OH)₂ (aq) → BaSO₄ (s) + 2 H₂O (l)

Now we write the ionic equation:

2 H⁺ (aq) + SO₄²⁻ (aq) + Ba²⁺ (aq) + 2 OH⁻ (aq) → BaSO₄ (s) + 2 H⁺ + 2 OH⁻ (aq)

We remove the spectator ions to obtain the net ionic equation:

SO₄²⁻ (aq) + Ba²⁺ (aq) → BaSO₄ (s)

where we have:

(aq) - aqueous

(s) - solid

(l) - liquid

Learn more about:

net ionic equation

brainly.com/question/7018960

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7 0

3 years ago

Do these 2 questions for brainest:)

Zarrin [17]

Answer:

element -Lead

atomic number- 82

Symbol- Pb

Mass-207.2

Element- Zinc

Atomic number-30

Symbol- Zn

Mass-65.39

4 0

3 years ago

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PLEASE HELP!! this is on USAtestprep a) b) c) d)

Fudgin [204]

D is the one or Na and MG

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3 years ago

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Write the following in scientific notation. Include the unit or it will be marked wrong. a. 3450 meters b. 0.0000432 liters c. 5

Anvisha [2.4K]

Answer:

$a. \: 3.450 \: \times \: {10}^{3} \: m \\ \\ b. \: 4.32 \: \: \times \: {10}^{ - 5} \: l \\ \\ c. \: 5.06 \: \times \: {10}^{5} {cm}^{3}$

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3 years ago