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Chemistry

How many protons are in an ion with 54 electrons and a - 1 charge?

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Jamarion Shields

Chemistry

Which of the following experimental observations proved that the idea of matter and mass being evenly distributed in an atom was flawed?

A. Less than 1% of the alpha particles went un-deflected through the gold foil.

B. Less than 1% of the alpha particles were deflected by angles greater than 90°.

C. The beam from the negative electrode was deflected by electrically charged rods.

D. The beam from the negative electrode cast a shadow on the positive electrode.

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Chemistry

Ionization involves completely removing an electron from an atom. light of a particular wavelength can cause ionization to occur if it has the required energy. the energy to ionize a certain element is 342 kj/mol. what wavelength contains enough energy in a single photon to ionize one atom of this element?

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America Coleman

Chemistry

How many molecules are contained in a 7.20-g sample of dimethylmercury?

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Chemistry

Could a nuecles of more than one proton but no nuetron exist? Explain

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Chemistry

Which of this is the method by which fire extinguisher works?

a) the cut of oxygen supply to the burning substance.

b) the reflect away the heat because of there colour and does cool down the burning substance.

c) the exert force on the substances, that has caught on fire because of which the fire gets extinguish.

d) they release chemicals, which react with oxygen in the air and stop it form reaching the burning substances.

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Chemistry

Stereoisomers are: Molecules that are coiled into compact and spherical shapes Molecules that release heat and have negative enthalpy changes Molecules with the same molecular formula but differ in the way their atoms are connected. Molecules with the same chemical bonds and formula but have a different geometry

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Messiah Whitney

Chemistry

Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?

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Chemistry

When you perform this reaction, what substances could remain at the end of the reaction?

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Chemistry

How many moles of CuSO4 are used to make 250 ml of a 0.50 M CuSO4 solution?

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Chemistry

The amount of kinetic energy and object has depends on it

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Chemistry

Naphthalene has a relatively high vapor pressure for a solid (because of its volatility, naphthalene is the active ingredient in some brands of mothballs). In view of this, what might happen if you place naphthalene under vacuum or in an oven for several hours to dry it?

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Chemistry

Titanium will react with magnesium oxide but sodium reacts with titanium oxide.

The position of titanium will be

a. above sodium

b ... below magnesium but above iron

c. below sodium but above magnesium

d ... below silver

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Chemistry

6. Cooked food that is being held for

later service must be held at a

temperature of:

A. 130°F or above B. 120°F or above

C. 160°F or above D. 135°F or above

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Chemistry

Sue has to find the empirical formula of a compound containing 81.8 grams of carbon and 18.2 grams of hydrogen in 100 grams of compound. What should her first step be?

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