Is melting butter exothermic or endothermic?

Which subatomic particles are found in the nucleus of an atom of beryllium? (1) electrons and protons (2) electrons and positrons (3) neutrons and protons (4) neutrons and electrons

Which contributes to the polarity of a water molecule? B. deflection of hydrogen atoms by lone pairs of electrons C. no difference in the electronegativity of oxygen and hydrogen

Q. A Substances that form hydrogen ions when released in water are called ... Choose one high acids bases saturated suspension salt solution hydrogen ions

A sample of oxygen gas occupies a volume of 250. mL at a pressure of 740. torr. What volume will the gas occupy at a pressure of 800. torr if temperature is held constant?

3) The ozone layer in the stratosphere protects Earth from the sun's ultraviolet radiation. Where does the ozone come from? A) The ozone is released from the oceans as part of the carbon cycle.

A pair of ice tongs is a double: first-class lever second-class lever third-class lever

On a ceiling, there were tiny droplets of blood less than 1 mm in diameter. the victim was lying in a pool of blood. no other marks were found on the other walls.

How would you prepare 70.0 ml of 0.200 m hno3 from a stock solution of 5.00 m hno3?

How do chemists know that an oxygen molecule have unpaired electrons?

How is firelight produced