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4 years ago

Which of the following best describes elements?

Chemistry

1 answer:

sukhopar [10]4 years ago

6 0

Explanation:

Elements are distinct substances that cannot be split-up into simpler substances. Such substances are made up of only one kind of atom.

Elements are classified as pure substances.
They are homogeneous in all parts.
They have a definite composition.
They cannot be split or broken into simpler substances by physical means.
There are over a hundred known elements.
Elements are usually symbolized by a capital letter or capital letter followed by a smaller letter derived from the English or Latin or Greek name of the element concerned.

learn more:

Element brainly.com/question/2572495

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What is the ph of a 2.00 m hno2 solution if ka=5.00 e-6?

zysi [14]

Answer: -

2.5

Explanation: -

Initial [HNO₂] = 2.00 M

ka = 5.00 x 10 ⁻⁶

ICE table for HNO₂ =

[ $\left[\begin{array}{cccc}concentrations&HNO2&H+&NO2\\Initial&2.00&0&0\\Change&-x&+x&+x\\Equilibrium&2.00-x&x&x\end{array}\right]$

Ka = $\frac{x2}{2.00-x}$

5.00 x 10-6 = $\frac{x2}{2.00-x}$

x = 0.0032 M

pH = - log [H⁺]

= - log 0.0032

= 2.5

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3 years ago

What is the best reason for a student to remove a dangling bracelet when heating test tubes of acidic solutions in a hot-water b

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alexira [117]

Answer:

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3 years ago

The mass of an object is 13.76 g. the volume of the object is 2.83 ml. what is the density of the object to the correct number o

Firlakuza [10]

Answer:

D ≈ 4.86 g/mL

Explanation:

Density = Mass over Volume

D = m/V

Step 1: Define variables

m = 13.76 g

V = 2.83 mL

D = unknown

Step 2: Substitute and Evaluate for Density

D = 13.76 g/2.83 mL

D = 4.8621908127208480565371024734982 g/mL

Step 3: Simplify

We are given 3 sig figs.

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