Question 1

What is density and how do I calculate it?

Accepted Answer

Density is mass per unit volume (ρ = m/V). For example, water has a density of 1 g/cm³ or 1000 kg/m³. To calculate density, divide mass by volume. Density varies with temperature and pressure, especially for gases. Our density calculator handles multiple units and materials.

Question 2

How do I convert between grams and moles?

Accepted Answer

Use the formula: moles = grams ÷ molar mass. Molar mass is the atomic/molecular weight in g/mol (found on periodic table). Example: 18 grams of water (H₂O, molar mass 18 g/mol) = 1 mole. Our calculator includes molar masses for common substances.

Question 3

What is frequency and how does it relate to wavelength?

Accepted Answer

Frequency (f) is cycles per second (Hz). Wavelength (λ) is distance per cycle. They're related by: f × λ = wave speed. For light in vacuum: f × λ = c (speed of light, 3×10⁸ m/s). Higher frequency means shorter wavelength. Our calculator converts between frequency, wavelength, and energy.

Question 4

How do I calculate specific heat capacity?

Accepted Answer

Specific heat capacity (c) is energy needed to raise 1 kg of material by 1°C. Formula: Q = mcΔT where Q is heat energy, m is mass, c is specific heat, ΔT is temperature change. Water has high specific heat (4184 J/kg°C), meaning it resists temperature change.

Question 5

What is molarity and how do I calculate solution concentrations?

Accepted Answer

Molarity (M) is moles of solute per liter of solution. Formula: M = moles ÷ liters. Example: dissolving 0.5 moles of NaCl in 2 liters of water gives 0.25 M solution. Our calculator handles molarity, molality, mass percent, and other concentration units.

Question 6

How do I convert between energy units (joules, calories, eV)?

Accepted Answer

Common conversions: 1 calorie = 4.184 joules, 1 eV = 1.602×10⁻¹⁹ joules, 1 kWh = 3.6 MJ. Different fields use different units: chemistry (kJ/mol), physics (eV), nutrition (calories). Our calculator converts between all standard energy units.

Question 7

What is the difference between atomic mass and molecular mass?

Accepted Answer

Atomic mass is for single atoms (e.g., carbon = 12 u). Molecular mass is sum of atomic masses in a molecule (e.g., H₂O = 2(1) + 16 = 18 u). Both use atomic mass units (u or amu). Molar mass is the same number but in g/mol.

Question 8

How do I calculate pH and understand acid-base chemistry?

Accepted Answer

pH = -log₁₀[H⁺] where [H⁺] is hydrogen ion concentration. pH scale: 0-7 acidic, 7 neutral, 7-14 basic. Each pH unit is 10× difference in acidity. pH 3 is 100× more acidic than pH 5. Our calculator converts between pH, pOH, [H⁺], and [OH⁻].

Question 9

What are significant figures and how do they work?

Accepted Answer

Significant figures (sig figs) indicate measurement precision. Rules: non-zero digits are significant, zeros between non-zero digits are significant, leading zeros aren't significant, trailing zeros after decimal are significant. Example: 0.00450 has 3 sig figs. Calculations should maintain appropriate precision.

Question 10

How do I calculate kinetic and potential energy?

Accepted Answer

Kinetic energy: KE = ½mv² (depends on mass and velocity squared). Potential energy: PE = mgh (gravitational, depends on mass, gravity, and height). Total mechanical energy is conserved in ideal systems. Our calculator handles various energy types and units.

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