Chemistry » Page 47

Chemistry

Carelyn

How many moles of H2 would be required to produce 5.0 moles of water

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Chemistry

Guest

Why is oil on able to dissolve well in water?

A. Water is polar and oil is nonpolar which means they have no attraction for each other

B. Oil molecules or too large to fit between the closely spaced water molecules in the liquid state

C. Water has a greater density than oil which means that they are not compatible for mixing together

D. The cohesive properties of water molecules make it difficult for substances like oil to dissolve

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Chemistry

Cash Morton

What is enthalpy a measure of?

A. The heat content of a system.

B. The kinetic energy of a system.

C. The number of moles of a reactant in a system.

D. The disorder of a system.

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Chemistry

Kylie Jimenez

Calculate the missing variable. M1 = 4.0 M V1 = 450mL M2 = ? V2 = 800mL

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Chemistry

Karter

The following substituents are listed in random order. Using the Cahn-Ingold-Prelog convention, rank the groups below from highest priority to lowest priority.-H, - SH, - CH2SH, - CH2CH2SH

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Chemistry

Eden Evans

Why is hydrogen not considered part of any group

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Chemistry

Devin Grant

What type of plate boundary is near mount manaro

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Chemistry

Dracula

All the following are signs of chemical reaction may have taken place in a piece of glass except:

A. glass changes colors

B. new substances beside glass are form

C. shape of glass changes

D. energy is used or given off

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Chemistry

Lyric Kaufman

Which of the following does NOT show the law of conservation of mass?

A. 24 g of Mg burn in 32 g O2 to produce 56 g of MgO.

B. 24 mL of Mg burn in 32 mL O2 to produce 56 mL of MgO.

C. 2 atoms of Mg react with 1 molecule of O2 to produce 2 units of MgO.

D. 1 atom of Mg reacts with 1 atom of O to produce a unit of MgO that contains 2 atoms.

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Chemistry

Guest

Calculate the percent activity of the radioactive isotope iridium-192 remaining after 2 half-lives.

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Chemistry

Damian Greene

Predator-prey relationships are shown through food trees. food chains. food webs. food networks.

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Chemistry

Kasen Robinson

Consult to find (a) two metals less dense than water, (b) two metals more dense than mercury, (c) the densest known solid metallic element, and (d) the densest known solid nonmetallic element.

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Chemistry

Mareli Sanchez

To a sample of water at 23.4oC in a constant pressure calorimeter of negligible heat capacity is added a 12.1 g piece of aluminium whose temperature is 81.7oC. If the final temperature of water is 24.9 oC, calculate the mass of the water in the calorimeter.

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Chemistry

Kendrick Bailey

How many electrons are in the second energy level of an atom of each element?

A. Chlorine

B. Phosphorus

C. Potassium

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Chemistry

Duncan Rivas

Which of the are not true in regarding to atomic raqdii of main group elements.

a. Atomic radii generally increase as you move from left to right across a period

b. atomic radii size is related to the number of electrons in the valence level and the number of protons in the nucleus.

c. atomic radii decrease size when the pull of electrons forward the nucleus of an atom is greater

d. atomic radii generally increase as you move down a group

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