What is meant by the negative sign in an answer like"-46.8kJ"? When would you use a positive sign

The discovery of penicillin is attributed to which area of chemistry

You have a series of four chemical reactions (1->2->3->4). How do you calculate the triangleH2 if you know the other triangleH values? A. Triangle H2 = triangleH1 + triangleH3 - triangleH4 B. Triangle H2 = triangleH1 + triangleH3 + triangleH4 C.

Molecules tend to move from an area where they are more concentrated to an area where they are less concentrated. this process is called

What determines the name of an element

How many oxygen atoms are there in 6.00 g of sodium dichromate, na2cr2o7?

Four moles of hydrogen chloride (HCl) gas react with one mole of oxygen (O2) gas to produce two moles of chlorine gas (Cl2) and two moles of water gas (H2O).

what noble gas electron configuration is achieved by the bromine atoms in a molecule of BR2, a diatomic element?

What are facts on osmosis?

If a map of temperature displayed stripes parallel to the equator with equal temperatures at equivalent distances north and south of the equator, it would mean that only blank affected temperature.

What is the term for the amount of salts in water? Evaporation Evaporation Salinity Thermocline Density