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4 years ago

What activity is considered a proper laboratory technique chem?

Chemistry

1 answer:

ale4655 [162]4 years ago

4 0

One of the activity of laboratory is the addition of acid to water.

The addition of acid to water make it easier for the reaction so that the acid gets diluted safely. On the other hand if water is added to acid it will get splash vigrously and may injure the hand of the chemist. The addition of water directly to acid contribute to exothermic reaction and releases more heat which may result in spraying around.

Adding acid to water, result in solution with very dilute solution and releases small heat. This small heat is not sufficient even to vaporizes a single drop of water.

Thus, adding acid to water is safer for dilution.

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200 ml of wagter increases to 203.5 ml what is the volume in milliliters

nlexa [21]

Answer: 203.5 millilitres

Explanation: ???

3 0

3 years ago

How many atoms are there in each of the following ?a.)1.50 mol Na c.) 0.250 mol. Sib.)6.755 mol Pb

tamaranim1 [39]

$a) \: n = \frac{N}{NA} \\ 1.5 = \frac{x}{6.02 \times \: {10}^{23} } \\ x = 1.5 \times 6.02 \times {10}^{23} \\ x = 9.03 \times {10}^{23} \: atoms \: of \: Na$

$b) \: n = \frac{N}{NA} \\ 0.25 = \frac{x}{6.02 \times \: {10}^{23} } \\ x = 0.25 \times 6.02 \times {10}^{23} \\ x = 1.505 \times {10}^{23} \: atoms \: of \: Si \:$
$c) \: n = \frac{N}{NA} \\ 6.755 = \frac{x}{6.02 \times \: {10}^{23} } \\ x = 6.755 \times 6.02 \times {10}^{23} \\ x = 40,6651 \times {10}^{23} \\ x = 4.07 \times {10}^{24} \: atoms \: of \: Pb \:$

5 0

3 years ago

What are the 6 branches of chemistry? With the definition and examples.

netineya [11]

Answer:

Listed below

Explanation:

Analytical chemistry: using quality and quantity observations to identify and measure physical and chemical properties of substances.EXAMPLE: medical diagnosis

Physical chemistry: Combination of physics and chemistry. EXAMPLE:nitric acid eating through wood.

Organic chemistry: Studying of compounds containing carbon in them. EXAMPLE: there are different products that make use of this type of chemistry for example perfumes,gasoline and many more.

Inorganic chemistry: Studies materials without carbon i them. EXAMPLE: Metals AND Gases.

Biochemistry: studies chemical processes occurring in living organisms. EXAMPLE: Human bodies and muscles

Theoretical chemistry: provides explanations to chemical and physical observation. EXAMPLE: Concepts of chemical reactions

HOPE IT HELPED

5 0

4 years ago

Please help me out with these questions please..<br><br> Both are in 1 picture:)

jeka57 [31]

Answer:

1. B

2. C

Explanation: The law that the properties of the elements are periodic functions of their atomic numbers. And the second one is, most of the air we breathe is made of oxygen.

8 0

3 years ago

Read 2 more answers

What product is formed when benzene reacts with isobutyl chloride in the presence of AlCl3?

oee [108]

The product formed when benzene reacts with isobutyl chloride in the presence of AlCl3 is tertiary butyl benzene.

THE CHEMICAL REACTION AS

step 1 : CH₃ - CH - CH₂Cl + AlCl₃ → CH₃ - CH₂ -CH₂ - CH₂⁺ + AlCl⁻

step 2: CH₃ - CH₂ - CH₂ - CH₂⁺ ---H SHIFT--→ (CH₃)₃C⁺

PRODUCT

C₆H₆ + (CH₃)₃ C⁺ → C₆H₆ ( CH₃)₃ C⁺

Hence the product formed is tertiary butyl benzene.

Learn more about chemical reaction on

brainly.com/question/11231920

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4 0

2 years ago