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3 years ago

What is the chemical equation for the alpha decay of erbium-144

Chemistry

1 answer:

iren [92.7K]3 years ago

8 0

Answer:

Er-144 -------> Dy-140 + He-4

Explanation:

Alpha decay is the release of a hydrogen nucleus. So the original atom will decrease the mass by 4 and the atomic number by 2.

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If a 22.4 L volume of a sample of gas has a density of 0.900 grams/L at 1.00 atm and 0.00°C. Given

disa [49]

Answer:

Formula Weight of gas sample = 20.1 g/mole => Neon (Ne)

Explanation:

Use Ideal Gas Law formula to determine formula weight and compare to formula weights of answer choices.

PV = nRT = (mass/fwt)RT => fwt = (mass/Volume)RT = Density x R x T

Density = 0.900 grams/L

R = 0.08206 L·atm/mole·K

T = 0.00°C = 273Kfwt = (0.900g/L)(0.08206L·atm/mole·K )(273K)

= 20.1 g/mol => Neon (Ne)

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3 years ago

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zloy xaker [14]

The last-Hypothesis Experiment

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3 years ago

What is the total number of joules of heat needed to change 300 g of water to

Mandarinka [93]

Answer:

6.78 × 10⁵ J

Explanation:

Step 1: Given and required data

Mass of water (m): 300 g

Latent heat of vaporization of water (ΔH°vap): 2260 J/g

Step 2: Calculate the heat (Q) required to vaporize 300 grams of water

We will use the following expression.

Q = ΔH°vap × m

Q = 2260 J/g × 300 g

Q = 6.78 × 10⁵ J

6.78 × 10⁵ Joule will be required to convert 300 g of water to steam at 100 °C.

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3 years ago

100 points! Formation of an Ion

RUDIKE [14]

$\huge\bold {Answer}$

Aluminum ions have a charge of +3. This means that the atoms have three more protons than electrons. In order to add electrons to aluminum ions, the purification process therefore requires a large amount of electricity.

Uncharged Aluminum atom must need to lose it's electrons,in order to form the bond with oxygen which has vacant orbitals

ion
atom that has a positive or negative charge because it lost or gained one or more electrons

chemical bond
the attractive force that holds atoms or ions together

ionic bond
a chemical bond in which one atom loses an electron and the other atom gains electrons to form ions

chemical formula
a combination of chemical symbols and numbers to represent a substance

covalent bond
bond formed by the sharing of electrons between atoms

Thanks

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3 years ago

Read 2 more answers

Where would (aq) (s) go in Cr(NO3)3+K3PO4

Ivenika [448]

Answer:

Cr(NO3)3 (aq) +K3PO4 (s)

Explanation:

7 0

3 years ago