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3 years ago

What 3 characteristics of matter does chemistry deal with?

1 answer:

3 0

Chemistry is concerned with:

1) Composition
The composition of matter helps determine how it will behave chemically and physically, and is studied in chemistry

2) Structure
The structure of a certain element or compound also governs how the substance behaves, making it another vital aspect of chemistry

3) Behavior
The behavior of substances is studied in order to have explanations presented for it, expanding our understanding.

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What is the wavelength of an X-ray that has a frequency of 7.8 x 1017 Hz

SVEN [57.7K]

Answer:

λ = 0.38 ×10⁻⁹ m

Explanation:

Given data:

Wavelength of xray = ?

Frequency of xray = 7.8 ×10¹⁷ Hz

Solution:

Formula:

Speed of light = wavelength × frequency

speed of light = 3×10⁸ m/s

Now we will put the values in formula.

3×10⁸ m/s = λ × 7.8 ×10¹⁷ Hz

λ = 3×10⁸ m/s / 7.8 ×10¹⁷ Hz

Hz = s⁻¹

λ = 3×10⁸ m/s / 7.8 ×10¹⁷s⁻¹

λ = 0.38 ×10⁻⁹ m

3 0

3 years ago

Nitroglycerine decomposes violently according to the chemical equation below. What mass of carbon dioxide gas is produced from t

Ulleksa [173]

Explanation:

Below is an attachment containing the solution.

5 0

4 years ago

You wish to prepare a buffer consisting of acetic acid and sodium acetate with a total acetic acetate plus acetate concentration

vovangra [49]

Ans: Acetic acid = 90.3 mM and Sodium acetate = 160 mM

Given:

Acetic Acid/Sodium Acetate buffer of pH = 5.0

Let HA = acetic acid

A- = sodium acetate

Total concentration [HA] + [A-] = 250 mM ------(1)

pKa(acetic acid) = 4.75

Based on Henderson-Hasselbalch equation

pH = pKa + log[A-]/[HA]

[A-]/[HA] = 10^(pH-pKa) = 10^(5-4.75) = 10^0.25 = 1.77

[A-] = 1.77[HA] -----(2)

From (1) and (2)

[HA] + 1.77[HA] = 250 mM

[HA] = 250/2.77 = 90.25 mM

[A-] = 1.77(90.25) = 159.74 mM

7 0

3 years ago

How many grams are in 562 dg? 56.2 g 56,200 g 5.620 g 5.62 g

lana66690 [7]

Answer:

56.2

Explanation:

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7 0

3 years ago

A radioactive substance of mass 768g has a half life of 3 years. After how many years does it leave only 6g undecayed?

vagabundo [1.1K]

Answer:

The answer is 21 years.

Explanation:

7×3

8 0

3 years ago

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