How many joules of heat energy are required to raise the temperature of
100 grams of water from 21°C to 23°C?

836.8J

Explanation:

Heat energy = ?

Mass = 100g

Initial temperature (T1) = 21°C

Final temperature (T2) = 23°C

Specific heat capacity of water (c) = 4.184J/g°C

To solve this question, we'll need to use the formula for calculating heat energy of a substance.

Q = mc∇t

Q = heat energy of substance

M = mass of substance

C = specific heat capacity of substance

∇t = change in temperature = T2 - T1

Q = 100 × 4.184 × (23 -21)

Q = 418.4 × 2

Q = 836.8J

The heat energy required to raise 100g of water from 21°C to 23°C is 836.8J

is it a purebred? it looks more like a red nose, but it doesn't have the red could it be a staffordshire bull terrior? unsure if that's the right name for it sorry

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.