Chemistry » Page 45

Chemistry

Adison Williams

What is a decay series?

A. A chart that lists isotopes by how likely they are to decay.

B. When an unstable isotope begins to decay and emits particles that cause atoms around it to become unstable.

C. A chart showing the energy released when different isotopes decay.

D. When a daughter nuclei from a fission reaction is unstable and continues to decay until it reaches a stable isotope.

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Chemistry

Paul White

What is a heterogeneous mixture

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Chemistry

Makayla Day

As seen in the following reaction, O2 + 2H2 à 2H2O, what particles composing the oxygen atoms (O2) and hydrogen atoms (H2) were directly involved in making the chemical reaction which created the water molecules?

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Chemistry

Nikolas Bray

Slated telephone poles or evidence of?

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Chemistry

Guest

5. There is water on the pan of the scale as you measure the mass of a mineral. If you were to

ignore the water, what would be the effect on your density calculation?

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Chemistry

Hugh

A student comes to the conclusion that solids are denser than liquids. Is this true? Explain.

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Chemistry

Aires

Any substance with a value between 8 and 14 is considered what?

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Chemistry

Jett Moody

How many chromosomes would be in a sex cell of a Syrian hamster

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Chemistry

Livia Waller

if you pull a Tomac radius versus First ionisation Energy would the graph reveal a direct or inverse relationship

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Chemistry

Jerome Roach

Which of the following bonds is the most polar in nature:

(1) Cl2

(2) HCl

(3) HBr

(4) HI

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Chemistry

Tripp

Combustion analysis of a 13.42-g sample of the unknown organic compound (which contains only carbon, hydrogen, and oxygen) produced 36.86g CO2 and 10.06g H2O. The molar mass of estriol is 288.38g/mol.

Find the molecular formula of the unknown compound

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Chemistry

Foster

What concept in Dalton's atomic theory has been modified?

A. All matter is composed of atoms.

B. Atoms of different elements have different properties and masses.

C. Atoms can combine in chemical reactions.

D. Atoms cannot be divided.

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Chemistry

Hugh Weiss

Which particles in an atom can increase or decrease in number without changing the identify of the elements?

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Chemistry

Turner Blair

Which process best describes the cause of lightning

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Chemistry

Carlie Mccormick

Which formula can be used to express the law of conservation of momentum, where p = momentum? pi = pf pi > pf pi < pf pi ≠ pf

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