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fredd [130]
2 years ago
7

Select all the statements that are TRUE about igneous rocks:

Chemistry
1 answer:
Leya [2.2K]2 years ago
7 0

Answer:

Intrusive rocks are formed by slow cooling lava/magma.

Igneous rocks are always formed from lava/magma.

Explanation:

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Animals get energy from the food that they eat. However, when the molecules from the food enter your cells, how do the molecules
sattari [20]

Answer:

The ATP is broken down into glucose which the cells use for energy.

6 0
3 years ago
Calculate the cell potential at 25oC under the following nonstandard conditions: 2MnO4-(aq) + 3Cu(s) + 8H+(aq) ⟶ 2MnO2(s) + 3Cu2
baherus [9]

Answer:

1.346 v

Explanation:

1) Fist of all we need to calculate the standard cell potential, one should look up the reduction potentials for the species envolved:

(oxidation) Cu_{(s)} →Cu^{2+}_{(aq)} +2e E°=0.337 v

(reduction) MnO_{4 (aq)} + 3e + 4H^{+}_{(aq)}→MnO_{2 (aq)}+2H_{2}O E°=1.679 v

(overall) 2MnO_{4 (aq)}+3Cu_{(s)}+8H^{+}_{(aq)}→3Cu^{2+}_{(aq)}+2MnO_{2 (aq)}+4H_{2}O E°=1.342 v

2) Nernst Equation

Knowing the standard potential, one calculates the nonstandard potential using the Nernst Equation:

E=E^{0} -\frac{RT}{nF}Ln\frac{[red]}{[ox]}

Where 'R' is the molar gas constant, 'T' is the kelvin temperature, 'n' is the number of electrons involved in the reaction and 'F' is the faraday constant.

The problem gives the [red]=0.66M and [ox]=1.69M, just apply to the Nernst Equation to give

E=1.342 -\frac{298.15*8.314}{6*96500}Ln\frac{[.66]}{[1.69]}=1.346

E=1.346

5 0
2 years ago
Protons are positively charged and repel other protons. Which other particle is found in the nucleus and separates protons so th
VashaNatasha [74]
Neutrons which doesn't have any charge
8 0
3 years ago
Which subatomic particles affect the mass of an atom
klasskru [66]

Answer:

protons and neutrons

Explanation:

those particles account for 99.99% of mass

6 0
3 years ago
How many atoms of hydrogen (h) are present in 200 molecules of ammonia (nh3)? express your answer numerically?
natita [175]
<span>Chemical formula of ammonia = NH3 As we can see there are three atoms of hydrogen in one molecule of ammonia. So in the 200 molecule of ammonia there will be = 200*3 = 600 atoms of hydrogen. Answer - 600 atoms of hydrogen.</span>
6 0
3 years ago
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