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2 years ago

If a substance has a ph of 3, what is it

Chemistry

2 answers:

nadya68 [22]2 years ago

6 0

It is is then referred to as Acidic

andriy [413]2 years ago

4 0

Answer:

Acidic

Explanation:

On a standard Ph scale, anything lower than 7 on a scale is acidic and anything over 7 is alkaline lemon consists a large amount of acidity due to the amount of citric acid equipped inside it, Bleach is placed on the alkaline side of the scale because it includes chemicals such as Sodium hypochlorite and KOH(Potassium hydroxide) which can cause chemical burns when they are near contact as a substance itself.

Simply, if a substance has a ph of 3 it is acidic.

(if you'd like you could choose my answer as brainliest it would help me a lot)

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Which element has the same number of valence electrons as calcium?

kipiarov [429]

Answer:

Barium has the same number of valence electrons as calcium

Explanation:

Valence electrons is the number of electrons of an atom on the outer shell.

Those valence electrons can participate in the formation of a chemical bond (if the outer shell is not closed); in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

Calcium is an atom, part of group 2, called the alkaline earth metals. The alkaline earth metals have 2 valence electrons.

Sulfur is part of a group 16, called the chalcogens or oxygen family. Those atoms have 6 valence electrons. They can form a bound with atoms of group 2 such as calcium, but do not have the same number of valence electrons.

Potassium is part of group 1, called the alkali metals or lithium family. Those atoms have 1 valence electrons. That means Potassium do not have the same number of valence electrons like calcium.

Neon is part of group 18, the noble gasses. Those are stable atoms, which means they have 8 valence electrons. They do not have the same number of valence electrons like Calcium.

Barium an atom, part of group 2, called the alkaline earth metals. The alkaline earth metals have 2 valence electrons. Calcium is also part of this group.

This means barium has the same number of valence electrons as Calcium.

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2 years ago

What are some similarities amongst elements within a group?

kifflom [539]

Elements in the same group have the same amount of electrons.

Elements in the same period have the same amount of atomic orbits.

Hope this helps!

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2 years ago

Estimate the standard internal energy of formation of liquid methyl acetate (methyl ethanoate, ch3cooch3) at 298 k from its stan

LenKa [72]

solution:

$the reaction for formation of methyl acetate is\\CH_{3}OH+CH_{3}COOH----------->CH_{3}COOCH_{3}+H_{2}O\\standard internal energy \\\delta u=\delta H -\delta(pv)=\delta H -\delta n\times RT\\where \delta n=change in number of moles=0\\\delta u=\delta H\\=-442kj/mol$

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2 years ago

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Express the product of 9.0 x 10^-4m and 8.1 x 10^4m using the correct number of significant digits

Assoli18 [71]

Answer:

7.3 × 10¹ m²

Explanation:

The language "product" means that we must multiply the numbers given to get our answer.

9.0 × 10⁻⁴ m × 8.1 × 10⁴ m = 7.3 × 10¹ m²

The significant figures rule for multiplication is that we must us the amount of significant figures in the number with the least significant figures, in this question this is 2 significant digits from both 9.0 × 10⁻⁴ m and 8.1 × 10⁴ m.

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3 years ago

Calculate thr number of photons having a wavelength of 10.0 μm required to produce 1.0 kJ of energy.

ddd [48]

Ok so first you need to figure out the energy of ONE photon with that wavelength. Using E=hc/lambda, you get E= 1.99 * 10^-20 J/photon. Now, how many photons do you need to add up to get to one kilojoule=1000 joules? 1000J / (1.99 * 10^-20 J/photon) = approximately 5 * 10^22 photons hope this helps

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2 years ago

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