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4 years ago

Select all that apply.

2 answers:

5 0

Tasting it and touching it are both potentially dangerous for a start haha. SO DONT DO THOSE ONES.

Litmus paper is a good choice because its colour changes based on the presence of an acid or base.
Phenolphthalein is an acid-base indicator and does a similar thing to litmus.

Litmus paper and phenolphthalein are the right choices

Nikitich [7]4 years ago

5 0

Answer : The correct options are, litmus paper and phenolphthalein.

Explanation :

Acid : It is a substance that has ability of donating proton or hydrogen ion, $H^+$ .

The properties of an acid are :

Acids are sour in taste.

The texture of an acid solution is sticky.

It changes the color of the litmus paper to red.

Base : It is a substance that has ability of donating hydroxide ion, $OH^-$ .

The properties of an base are :

Base are bitter in taste.

The texture of an base solution is slippery.

It changes the color of the litmus paper to blue.

Indicators : It is a substance that gives the visible sign by the color change of the chemical species like an acid or a base.

Litmus paper : It turns red when it is added to a strong acid, it turns blue or purple when it is added to a strong base and it turns a yellowish-green when it is added to a neutral solution.

Phenolphthalein : It is also used as an indicator in acid–base titrations. It turns colorless in acidic solutions and pink in basic solutions.

Thus, there are two good ways to test whether a solution is an acid or a base which are litmus paper and phenolphthalein.

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How many moles are there in 45.0 grams of sulfuric acid,<br> H2SO4?

olga2289 [7]

Answer:

the answer is 0.4588162459

Explanation:

1 mole = 0.010195916576195

= 45 ×"

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3 years ago

What percent of the ocean is euphotic zone

valina [46]

Depth where light intensity falls to one percent<span> of that at the surface, called the euphotic depth</span>

7 0

4 years ago

Compare and contrast 10kg of melting ice and 1kg of freezing water address temperature heat flow thermal energy what is the simp

iris [78.8K]

Answer:

10 kg of ice will require more energy than the released when 1 kg of water is frozen because the heat of phase transition increases as the mass increases.

Explanation:

Hello!

In this case, since the melting phase transition occurs when the solid goes to liquid and the freezing one when the liquid goes to solid, we can infer that melting is a process which requires energy to separate the molecules and freezing is a process that releases energy to gather the molecules.

Moreover, since the required energy to melt 1 g of ice is 334 J and the released energy when 1 g of water is frozen to ice is the same 334 J, if we want to melt 10 kg of ice, a higher amount of energy well be required in comparison to the released energy when 1 kg of water freezes, which is about 334000 J for the melting of those 10 kg of ice and only 334 J for the freezing of that 1 kg of water.

Best regards!

7 0

3 years ago

How many atoms are in 87.1 g of nickel?

devlian [24]

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4 0

3 years ago

Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Zn2+, Ni4+, F-

hram777 [196]

Ionic compounds are formed between oppositely charged ions.

A binary ionic compound is composed of ions of two different elements - one of which is a positive ion(metal), and the other is negative ion (nonmetal).

To write the empirical formula of binary ionic compound we must remember that one ion should be positive and other ion should be negative, then only the correct formula should be written. To write the empirical formula the charges of opposite ions should be criss-crossed.

First empirical formula of binary ionic compound is written between $Zn^{2+} (Positive ion)and F^{-} (Negative ion)$

First Formula would be $ZnF_{2}$

Second empirical formula is between $Zn^{2+}(Positive ion) and O^{2-}(Negative ion)$

Second Formula would be $Zn_{2}O_{2}$

Note : When the subscript are same they get cancel out, so $Zn_{2}O_{2}$ would be written as $ZnO$

Third empirical formula is between $Ni^{4+}(Positive ion) and F^{-}(Negative ion)$

Third Formula would be : $NiF_{4}$

Forth empirical formula is between $Ni^{4+}(Positive ion)and O^{2-}(negative ion)$

Forth Formula would be : $Ni_{2}O_{4}$ or $NiO_{2}$

Note- The subscript will be simplified and the formula will be written as $NiO_{2}$ .

The empirical formula of four binary ionic compounds are : $ZnF_{2}, ZnO, NiF_{4},NiO_{2}$

8 0

3 years ago

Read 2 more answers