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3 years ago

Which three of the five items would be best to include in a safety contract?

2 answers:

7 0

Student Safety Contract - Flinn Scientific
ties which require the use of hazardous chemicals. Safety in ... vided to you in this student safety contract. ... 3. Never work alone. No student may work in the laboratory without an instructor ... Look for things such as.
Missing: five ‎| Must include: five

jok3333 [9.3K]3 years ago

6 0

Answer:

(1) Label all containers

(2) Tie long hair back

(5) Wear safety goggles at all times

Explanation:

Took the test on Edge. Hope this helps! :)

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H2SO4 is added to a large beaker of water. How is the solution different from the original water?

Natasha_Volkova [10]

Answer is: A) The solution turns blue litmus to red.

Sulfuric acid (H₂SO₄) is a strong acid, it means that the solution of sufuric acid is more acidic (pH<7) than water (pH = 7).

Chemical dissociation of sulfuric acid in water:

H₂SO₄(aq) → 2H⁺(aq) + SO₄²⁻(aq).

When solution turns phenolphthalein pink, it means it is basic (pH>7).

Sulfuric acid has more hydrogen ions (H⁺) and less hydroxide ions (OH⁻) than water.

5 0

3 years ago

Read 2 more answers

Write a chemical equation for KOH(aq) showing how it is an acid or a base according to the Arrhenius definition.

Sati [7]

Answer:

Write a chemical equation for KOH(aq) showing how it is an acid or a base according to the Arrhenius definition.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Write a chemical equation for NH4+(aq) showing how it is an acid or a base according to the Arrhenius definition.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Explanation:

According to this theory, an acid is a substance that is a proton donor when the substance is dissolved in water.

The base is the one that gives OH- ions when dissolved in water.

KOH(aq) is a base.

Because it releases OH- ions when dissolved in water.

$KOH(aq)->K^+(aq)+OH^-(aq)$

The ammonium ion is an acid.

It can donate a proton when dissolved in water.

$NH_4^+(aq)->NH_3(aq)+H^+(aq)$

4 0

3 years ago

Combustion analysis of an unknown compound containing only carbon, hydrogen, and nitrogen produced 1.1385 g of co2 and 0.5652 g

taurus [48]

Co2 is correct hope this helps bud

5 0

4 years ago

What is the empirical formula for a substance if a 201.6 g sample of it contains 54.0 grams of nitrogen, 15.0 grams of hydrogen,

jeyben [28]

The empirical formula of the substance would be $NH_4Cl$

<h3>Empirical formula calculation</h3>

The constituents of the compound are as follows:

N = 54/201.6 = 26.78% = 26.78/14 = 1.91 moles

H = 15/201.6 = 7.44% = 7.44/1 = 7.44 moles

Cl = 132.6/201.6 = 65.48% = 65.48/35.5 = 1.84 moles

Divide the number of moles by the smallest"

N = 1.91/1.84 = 1

H = 7.44/1.84 = 4

Cl = 1.84/1.84 = 1

Thus, the empirical formula is $NH_4Cl$

More on empirical formula can be found here: brainly.com/question/14044066

#SPJ1

6 0

2 years ago

40.0% C, 6.72% H, 53.29%, O. Molar mass is 60 g/mol. Determine the empirical and molecular formula.

arsen [322]

Answer:

Molecular formula: C₂H₄O₂

Empirical formula: CH₂O

Explanation:

40 % C, 6.72 % H and 53.29 % O states the centesimal composition of the compound. These data means that in 100 g of compound we have x grams of a determined element.

We divide the mass by the molar mass of each:

40 g / 12 g/mol = 3.33 moles of C

6.72 g / 1 g/mol = 6.72 moles of H

53.29 g / 16 g/mol = 3.33 moles of O

We can determine rules of three to get, the molecular formula.

In 100 g of compound we have 3.33 moles of C, 6.72 moles of H and 3.33 moles of O; therefore in 60 g (1 mol) we must have

- (60 . 3.33) / 100 = 2 moles of C

- (60 . 6.72) / 100 = 4 moles of H

- (60 . 3.33) / 100 = 2 moles of O

Molecular formula is C₂H₄O₂

Empirical formula has the lowest suscripts; we divide by two, so the empirical formula is CH₂O

3 0

3 years ago