Every cell is surrounded by a thin membrane. What is the main function of this cell membrane?

A container with a fixed volume, filled with hydrogen gas at - 104°C and 71.8 K PA is heated until the pressure reaches 225.9 K PA. What is the temperature of the hydrogen gas in degrees Celsius

The density of magnesium is 1.7 g/cm3, and the density of iron is 7.9 g/cm3. Consider a block of iron with a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?

On a graph, which type of line shows a direct proportion? A - downwardly curved line B - jagged line C - straight line D - upwardly curved line

Which type of reaction occurs in the following equation? 2NO2 (g) + 2OH" (aq) - - NO2 (aq) + NO, (aq) + H2O (1) a combination redox reaction a displacement redox reaction a synthetic redox reaction a disproportionation redox reaction

How many electron cloud energy levels are present in aluminum?

Which of these is a covalent compound? 1. AICI3 2. CO 3. MgO 4. LiCI

What is a protein used for

Atoms of the halogen family typically steal two electrons from other atoms when they react true or false

Looking at the periodic table, which group consists of elements that will not form an acid when combine with hydrogen? A) radon, neon, calcium B) neon, bromine, barium C) beryllium, iodine, krypton D) lithium, potassium, fluorine

Mixtures have (exact, relative) amounts of the same substances