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3 years ago

Observe this chemical reaction: 4 Fe + 302– 2Fe2O3 How many reactants are there ?

Chemistry

2 answers:

kirza4 [7]3 years ago

8 0

Answer:

2 Reactants

Explanation:

its the iron and oxygen

Veronika [31]3 years ago

8 0

2 because iron is one and oxygen is another.

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Photons of infrared radiation are responsible for much of the warmth we feel when holding our hands before a fire. These photons

KIM [24]

Answer:

$8.3\cdot 10^{22}$ photons

Explanation:

The energy of a photon is given by

$E_1 = \frac{hc}{\lambda}$

where

$h=6.63\cdot 10^{-34} Js$ is the Planck constant

$c=3.0\cdot 10^8 m/s$ is the speed of light

$\lambda$ is the photon wavelength

Here we have

$\lambda=1.5\cdot 10^{-6} m$

So, the energy of 1 of these infrared photons is

$E_1=\frac{(6.63\cdot 10^{-34})(3\cdot 10^8)}{1.5\cdot 10^{-6}}=1.32\cdot 10^{-19} J$

The amount of energy needed to increase the temperature of the cup of water is:

$E=mC\Delta T$

where

m = 175 g is the mass

$C=4.186 J/gC$ is the specific heat capacity

$\Delta T=40-25=15^{\circ}C$ is the increase in temperature

So,

$E=(175)(4.186)(15)=10,988 J$

Therefore, the number of photons needed is:

$n=\frac{E}{E_1}=\frac{10,988}{1.32\cdot 10^{-19}}=8.3\cdot 10^{22}$

5 0

3 years ago

Which statement is FALSE?

Assoli18 [71]

Answer:Mass number - Atomic Number = Neutrons

Explanation:

4 0

3 years ago

Which term describes the substance that is completely consumed (used up) during a chemical

MAXImum [283]

Limiting reactant I think

4 0

3 years ago

Read 2 more answers

The weathering of a tall mountain down into a low-lying hill is an example of a landform being changed through a ______ process

e-lub [12.9K]

an erosive process or erosion

erosion is when a rock is changed through the weather

7 0

3 years ago

Which element has the highest electronegativity and why?

BigorU [14]

Answer:

See below

Explanation:

Hello there!

Electronegativity is the atom's tendency to attract electrons in a chemical bond

There are two trends to electronegativity:

Electronegativity increases from bottom to top in a group (Li has a greater electronegativity than Fr, for example)
Electronegativity increases from left to right across a period (the further right the group, the greater the electronegativity)

Looking at a period table, Sb, Sn, Te, and I are all in the same period, so we'll need to decide which element has the highest electronegativity based on the group.

Sn belongs to group 4A (group 14)
Sb belongs to group 5A (group 15)
Te belongs to group 6A (group 16)
I belongs to group 7A (group 17)

As I belongs to group 7A, the group that is the farthest right based off of the options given, I has the highest electronegativity

Hope this helps!

8 0

3 years ago