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VARVARA [1.3K]
3 years ago
5

Someone Help me please

Chemistry
1 answer:
Eddi Din [679]3 years ago
3 0
The answer is starch because iodine reacts with starch to change the colour to inky blue or black.
All the others are present in milk naturally so I’m assuming they intent starch
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Which of the following is a pure substance? Choose all that apply.
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Nickel is a pure substance

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Everyone in squidwards family has light blue skin which is dom trait for body color in hid homtonof squid vally
ArbitrLikvidat [17]
Okay what am i answering?
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2 years ago
What mass of F2 is needed to produce 180 g of PF3 if the reaction has a 78.1% yield?
nexus9112 [7]

Answer:

91.26 g

Explanation:

Given data:

Mass of PF₃ = 180 g

Mass of F₂ required = ?

Solution:

Chemical equation:

P₄ + 6F₂   → 4PF₃

Moles of PF₃:

Number of moles = mass/ molar mass

Number of moles = 180 g/ 88 g/mol

Number of moles = 2.05 mol

Now we will compare the moles of PF₃ with F₂.

                        PF₃            :           F₂

                          4               :           6

                          2.05         :           6/4×2.05 = 3.075

Mass of  F₂:

Mass of F₂ = moles × molar mass

Mass of F₂ = 3.075 mol × 38 g/mol

Mass of F₂ =  116.85 g

If reaction yield is 78.1%:

116.85 /100 ×78.1 = 91.26 g

6 0
3 years ago
True or false - The electrostatic attraction of the nucleus and the outermost electron increases as you go down the group.
Mashutka [201]

Answer:

its true

Explanation:

3 0
2 years ago
Balance these 2 equations AND identify the products and the reactants:
iogann1982 [59]

Answer:

Explanation:

1) NaCl → Na + Cl₂

2) Na + HCl  → NaCl + H₂

Chemical equation:

NaCl → Na + Cl₂

Balanced chemical equation:

2NaCl → 2Na + Cl₂

There are two moles of sodium and two mole of chlorine on both side of equation so given chemical equation is correctly balanced and follow the law of conservation of mass.

2)

Chemical equation:

Na + HCl  → NaCl + H₂

Balanced chemical equation:

2Na + 2HCl  → 2NaCl + H₂

There are two moles of sodium and two mole of chlorine and hydrogen on both side of equation so given chemical equation is correctly balanced and follow the law of conservation of mass.

Law of conservation mass

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

6 0
3 years ago
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