# Please help me answer these questions. Thank you How much heat is required to raise the temperature of 400.0 grams of water from 45.5 oC to 60.5 oC?

How much heat is required to raise the temperature of 400.0 grams of water from 45.5 oC to 60.5 oC? Specific heat of water is 4.184 J/g.oC.

42.7 kJ

101 kJ

76.1 kJ

25.1 kJ

A 45.4 grams of a gold metal sample at 34.3 oC was heated with the amount of energy of 228 J. Which of the following would the most plausible temperature of the gold sample after heating? The specific heat of gold is 0.131 J/g.oC.

52.1 oC

61.1 oC

72.6 oC

38.3 oC

120. grams of a solid absorbs 3.00 kJ of heat to raise its temperature from 23.5 oC to 57.3 oC. What is the specific heat of the solid?

0.392 J/g. oC

1.06 J/g.oC

0.436 J/g.oC

0.740 J/g.oC

When 55.0-grams of metal at 115.0 oC was placed into 125 grams of water, temperature of water rose from 26.3 oC to 30.6 oC. Find the specific heat of the metal.

0.24 J/g.oC

1.25 J/g.oC

0.48 J/g.oC

0.95 J/g.oC

Which of the following releases energy?

riding a bicycle

burning sugar

melting ice

vaporizing water to steam

Which of the following is not proposed by Dalton’s atomic theory?

Elements are composed of minute, indivisible particles called atoms.

Atoms of same elements can have different sizes.

Atoms of the same element have the same mass.

Atoms of two elements may combine in different ratios to form more than one compound.

Which of the following subatomic particles has the smallest mass?

a neutron

an electron

a proton

The mass of a hydrogen atom is 1.673 x 10-24 grams. What is the mass of 1.84 x 1025 atoms of hydrogen (H)?

30.8 g H

209 g H

1.10 g H

11.0 g H

Identify the numbers of protons, electrons, and neutrons of the isotope below.

number of neutrons

11             23             34             12

number of protons

11             23             34             12

number of electrons

11             23             34             12

The number of protons in an atom is referred as;

mass number

atomic mass

atomic number

charge

Which of the following describes an isotope of oxygen?

an atom with 8 protons and 8 neutrons

an atom with 16 protons

an atom with the atomic number of 16

an atom with the atomic number of 16 and the mass number of 16

Which of the following elements has 20 neutrons and has a mass number of 39?

Yttrium

calcium

potassium

phosphorus

An atom with an atomic number of 38 loses two electrons to become an ion.

How many protons are there in the resulting ion?

40             anion             cation             +1             38             36             -1             -2             +2

Is the resulting ion is a cation or an anion?

40             anion             cation             +1             38             36             -1             -2             +2

What would be the charge of the resulting ion?

40             anion             cation             +1             38             36             -1             -2             +2

Identify the numbers of protons and electrons of a phosphide ion (P3-).

number of protons

15             31             12             18

number of electrons

15             31             12             18

Which of the following describes the discovery of the structure of the atom by the gold foil experiment.

Protons and electrons are found in the nucleus of the atom.

Electrons are distributed around the nucleus and occupy mostly empty space.

Protons, neutrons, and electrons are evenly distributed throughout the atomic sphere.

Which of the following subatomic particles resides in the nucleus of an atom?

proton(s) and electron(s)

proton(s) and/or neutron(s)

electron(s) and neutron(s)

neutron(s)

There are three naturally occurring isotopes of neon as follows (atomic mass and percent abundance are given in parentheses:

Ne-20 (atomic mass = 19.99 amu; 90.51%), Ne-21 (atomic mass 20.99 amu; 0.27%), and Ne-22 (atomic mass 21.99; 9.22%)

Determine the average atomic mass of neon.

20.18 amu

19.09 amu

21.02 amu

10.00 amu

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