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3 years ago

What are the two types of dichotomous keys. Which is easier to use?

Chemistry

1 answer:

SVEN [57.7K]3 years ago

5 0

I think the two are text and pictorial.

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True or False <br> a gas that ignites a glowing splint is oxygen

miss Akunina [59]

True, oxygen gas ignites a glowing splint

8 0

3 years ago

How many grams of fluorine are needed to react with 8.5g of phosphorus?

love history [14]

Step 1: write the equation:

P₄(s) + 6F₂(g) → 4PF₃(g)

Step 2: Molar mass of P₄ = 30.97 g/mol × 4 = 123.88 g/mol

Step 3: Number of moles of phosphorus

n = m/M

n = 8.5 g/123.88g/mol

n = 0.07 moles

Step 4: 0.07 × 12 = 0.84 moles of fluorine.

Fluorine is diatomic gas so we multiplied the number of moles by 12.

Step 5: To find the mass of fluorine we multiply the number of moles with the molar mass.

Mass of fluorine = 0.84 × 228

= 191.52 grams.

4 0

3 years ago

You notice that when the parchment paper of an ancient document is exposed to a certain chemical, the parchment paper becomes a

const2013 [10]

You have done a chemical change

5 0

3 years ago

The electron configuration below applies to which element? 1s2 2s2 2p6 3s2 3p1

zvonat [6]

Aluminum! hope this helps

6 0

3 years ago

When potassium metal is placed in water, a large amount of energy is released as potassium hydroxide and hydrogen gas are produc

blsea [12.9K]

Answer: The given reaction redox reaction not a combustion reaction.

Explanation:

Redox Reaction is defined chemical reaction in which oxidation and reduction takes place simultaneously. In Oxidation addition of oxygen occurs and in reduction addition of hydrogen occurs.

$2K+2H_2O\rightarrow 2KOH+H_2$

Potassium is getting oxidized by addition of oxygen.

Water us reduced to hydrogen gas by removal of oxygen

Combustion reaction is defined as chemical reaction in which burning of a chemical compound or element takes place in presence of oxygen occurs.

In the given reaction, oxygen molecule is absent which means this reaction is not combustion reaction.

Hence ,the given reaction redox reaction not a combustion reaction.

8 0

4 years ago