Sin^4x+2sin^2x-3=0 find interval [0,2pie)

Is sand a solid, liquid or gas? whats your claim (state what you think) whats your evidence (give two examples) reasoning (explian the science behind your cilam)

A buffer contains 0.18 mol of propionic acid (C2H5COOH) and 0.26 mol of sodium propionate (C2H5COONa) in 1.20 L. What is the pH of this buffer? What is the pH of the buffer after the addition of 0.

Which of these is an example of plants depending on animals? A. Flowering plants are pollinated when bees and other insects move around in the flowers. B. Burrs are seeds from a plant that are dispersed by getting stuck to the fur of animals. C.

The specific heat of aluminum is 0.90 J/g·°C. How much energy is required to raise the temperature of 10 grams of aluminum from 10°C to 20°C?

The discovery of the electron as a subatomic particle was a result of 1) collision theory 2) kinetic molecular theory 3) the gold-foil experiment 4) experiments with cathode ray tubes

A liquid is placed in an evacuated, sealed flask. When will this closed system reach dynamic equilibrium?

How much heat is required to decompose 25.5 grams of NaHCO3? 2NaHCO3 (s) + 129 kJ 2Na2CO3 (s) + H2O ( g. + CO2 ( g.

An element is identified by: A. Its number of protons B. the atomic mass C. The type of charge D. its number of isotopes

A neutralization reaction between koh (aq) and h2so4 (aq) would give which two products?

A cube has a mass of 83.021 g and a side length of 7.55cm. Find the volume of the cube in cm3.