Biochemistry

What is the mass number of an atom of potassium that has 20 neutrons?

What is the mass number of an atom of potassium that has 20 neutrons?

What is the mass number of an atom of potassium that has 20 neutrons?

▸ 35

▸ 19

▸ 15

▸ 59

▸ 39

Maddieskye   58   1 Reply

Sgagne3452

The mass number of an atom can be calculated from ________.

The mass number of an atom can be calculated from ________.

The mass number of an atom can be calculated from ________.

▸ the number of protons plus neutrons

▸ the number of neutrons

▸ the number of protons

▸ the number of electrons

▸ the number of electrons plus protons

tum2015   51   1 Reply

squally

Which of the following descriptions of a subatomic particle is correct?

Which of the following descriptions of a subatomic particle is correct?

[html]Which of the following descriptions of a subatomic particle is correct?

▸ A proton has a positive charge and a negligible mass.

▸ A proton has a positive charge and a mass of approximately 1 amu.

▸ An electron has a negative charge and a mas

shchandan   59   1 Reply

2ne1_12345

According to the atomic theory, ________.

According to the atomic theory, ________.

[html]According to the atomic theory, ________.

▸ a compound can contain different numbers of atoms as long as it has the same kinds of atoms

▸ all atoms are different

▸ atoms of the same element combine to form compounds

▸ all matter is made up

crystalcc21   51   1 Reply

christmasnugget

The smallest particle of an element that retains the characteristics of the element is a(n) ________.

The smallest particle of an element that retains the characteristics of the element is a(n) ________.

The smallest particle of an element that retains the characteristics of the element is a(n) ________.

▸ atom

▸ proton

▸ electron

▸ neutron

▸ nucleus

sxllykxm   84   1 Reply

gma_of_7

Identify the metalloid in the following list.

Identify the metalloid in the following list.

Identify the metalloid in the following list.

▸ copper

▸ germanium

▸ silver

▸ fluorine

▸ sulfur

sarammm   55   1 Reply

mohawktidalwave

The elements lithium, sodium, and potassium ________.

The elements lithium, sodium, and potassium ________.

The elements lithium, sodium, and potassium ________.

▸ are in the same period of elements

▸ are in the same group

▸ have the same mass number

▸ are isotopes of each other

▸ have the same number of neutrons

Sodamafia   56   1 Reply

Loruiz15

Which of the following elements is a noble gas?

Which of the following elements is a noble gas?

Which of the following elements is a noble gas?

▸ chlorine

▸ bromine

▸ nitrogen

▸ oxygen

▸ argon

kmrocha   44   1 Reply

sweetalia

Which of the following is a characteristic of nonmetals?

Which of the following is a characteristic of nonmetals?

Which of the following is a characteristic of nonmetals?

▸ good conductors of electricity

▸ good conductors of heat

▸ shiny

▸ low melting points

▸ malleable

garrettl24   53   1 Reply

need answers1

Which of the following elements is a metalloid?

Which of the following elements is a metalloid?

Which of the following elements is a metalloid?

▸ nitrogen

▸ silicon

▸ lithium

▸ gold

▸ iron

nicolehetman   63   1 Reply

klkljug

Which of the following properties is not a characteristic of the Group 1A (1) elements (alkali metals)?

Which of the following properties is not a characteristic of the Group 1A (1) elements (alkali metals)?

[html]Which of the following properties is not a characteristic of the Group 1A (1) elements (alkali metals)?

▸ They are good conductors of heat.

▸ They are shiny.

▸ They are good conductors of electricity.

▸ Most of them are liquids at room temp

Guest   78   1 Reply

mtjhgdcg

Which of the following is a characteristic of the modern periodic table?

Which of the following is a characteristic of the modern periodic table?

[html]Which of the following is a characteristic of the modern periodic table?

▸ The elements in each group have similar chemical properties.

▸ The B groups contain the representative elements.

▸ The A groups contain the transition elements.

▸ A

kanudinho   73   1 Reply

carston

What elements are in hydroxyapatite, Ca5(PO4)3OH, a major compound in human bones and teeth?

What elements are in hydroxyapatite, Ca5(PO4)3OH, a major compound in human bones and teeth?

[html]What elements are in hydroxyapatite, Ca5(PO4)3OH, a major compound in human bones and teeth?

▸ carbon, potassium, oxygen, hydrogen

▸ calcium, phosphorous, oxygen, helium

▸ calcium, phosphorous, oxygen, hydrog

Deep Brar   78   1 Reply

Nigel Cordoni

Select the correct symbol for the element potassium.

Select the correct symbol for the element potassium.

Select the correct symbol for the element potassium.

▸ Pt

▸ Po

▸ K

▸ Ko

▸ P

Bpr621   76   1 Reply

rachmccoll

Select the correct symbol for the element sodium.

Select the correct symbol for the element sodium.

Select the correct symbol for the element sodium.

▸ So

▸ No

▸ Na

▸ Au

▸ Sm

sam_48   72   1 Reply

asd454512

Select the correct symbol for the element iron.

Select the correct symbol for the element iron.

Select the correct symbol for the element iron.

▸ Fs

▸ In

▸ Fe

▸ FE

▸ Ir

livesimply   86   1 Reply

Alina01978

Select the correct symbol for the element aluminum.

Select the correct symbol for the element aluminum.

Select the correct symbol for the element aluminum.

▸ Au

▸ Ag

▸ Am

▸ Al

▸ Sn

Tiana_Kailynn   62   1 Reply

courtneyrmcd

Pb is the symbol for ________.

Pb is the symbol for ________.

Pb is the symbol for ________.

▸ mercury

▸ potassium

▸ plumbium

▸ lead

▸ silver

writingprof12   54   1 Reply

fsdgsadfag

Condensation occurs when a liquid is converted to a solid.

Condensation occurs when a liquid is converted to a solid.

Condensation occurs when a liquid is converted to a solid.

▸ true

▸ false

Znick   64   1 Reply

obasemola

The heat of fusion of water is larger than the heat of vaporization.

The heat of fusion of water is larger than the heat of vaporization.

The heat of fusion of water is larger than the heat of vaporization.

▸ true

▸ false

smhbyc   107   1 Reply

yerkebulan

Water freezes at 100 C.

Water freezes at 100 C.

Water freezes at 100 °C.

▸ true

▸ false

dewsae   63   1 Reply

Karen

When a liquid is boiling, its temperature does not change.

When a liquid is boiling, its temperature does not change.

When a liquid is boiling, its temperature does not change.

▸ true

▸ false

cherimcd91   49   1 Reply

klkljug

As heat is removed from a solid, its temperature decreases.

As heat is removed from a solid, its temperature decreases.

As heat is removed from a solid, its temperature decreases.

▸ true

▸ false

arlinguillen   38   1 Reply

rtwyhw4

The heat of fusion is greater than the heat of vaporization.

The heat of fusion is greater than the heat of vaporization.

The heat of fusion is greater than the heat of vaporization.

▸ true

▸ false

mathdawg33   59   1 Reply

Goku935

650 cal = 2700 J

650 cal = 2700 J

650 cal = 2700 J

▸ true

▸ false

Diamondlove   41   1 Reply

KaylaG

The degree Celsius is a unit of energy.

The degree Celsius is a unit of energy.

The degree Celsius is a unit of energy.

▸ true

▸ false

sjeanlou423   28   1 Reply

KaylaG

Water vapor is a gas.

Water vapor is a gas.

Water vapor is a gas.

▸ true

▸ false

tweedleasasin   38   1 Reply

Loruiz15

Iron rusting is a chemical change.

Iron rusting is a chemical change.

Iron rusting is a chemical change.

▸ true

▸ false

polanco79   35   1 Reply

ruthm17

A compound only contains one type of atom.

A compound only contains one type of atom.

A compound only contains one type of atom.

▸ true

▸ false

mathdawg33   41   1 Reply

Lydiaa

Bromine (Br2) has a freezing point of -7 C, and a boiling point of 60 C. Indicate the state present ...

Bromine (Br2) has a freezing point of -7 C, and a boiling point of 60 C. Indicate the state present ...

[html]Bromine (Br2) has a freezing point of -7 °C, and a boiling point of 60 °C.
Indicate the state present or the ch

baschese   39   1 Reply

Turito65

Bromine (Br2) has a freezing point of -7 C, and a boiling point of 60 C. Indicate the state present ...

Bromine (Br2) has a freezing point of -7 C, and a boiling point of 60 C. Indicate the state present ...

[html]Bromine (Br2) has a freezing point of -7 °C, and a boiling point of 60 °C.
Indicate the state present or the ch

MZ Mai   43   1 Reply

Tim0301

The amount of heat necessary for one gram of a substance to change from the solid state to the ...

The amount of heat necessary for one gram of a substance to change from the solid state to the ...

The amount of heat necessary for one gram of a substance to change from the solid state to the liquid state at its melting point is the ________.

kyliesalm   60   1 Reply

youngmoney1206

The heat of fusion is the amount of heat necessary to change one gram of a substance from the solid ...

The heat of fusion is the amount of heat necessary to change one gram of a substance from the solid ...

The heat of fusion is the amount of heat necessary to change one gram of a substance from the solid to the ________ state at its melting point.

lolerdog1   64   1 Reply

ouasfoudgewu

The change of state from solid to gas is termed ________.

The change of state from solid to gas is termed ________.

The change of state from solid to gas is termed ________.

aemarmolejos   42   1 Reply

Roselalo

The specific heat of water (in J/g C ) is ________.

The specific heat of water (in J/g C ) is ________.

The specific heat of water (in J/g °C ) is ________.

Heeyou!   56   1 Reply

mira

A 12-g sample of cooking oil, which is a fat, contains ________ kcal. (Round to the tens place.)

A 12-g sample of cooking oil, which is a fat, contains ________ kcal. (Round to the tens place.)

A 12-g sample of cooking oil, which is a fat, contains ________ kcal. (Round to the tens place.)

your lady   183   1 Reply

jiran50

A temperature of 20C is equivalent to ________ K.

A temperature of 20C is equivalent to ________ K.

A temperature of 20°C is equivalent to ________ K.

aemarmolejos   41   1 Reply

Guest

The ________ state of matter has a constant shape and volume.

The ________ state of matter has a constant shape and volume.

The ________ state of matter has a constant shape and volume.

yexiu   42   1 Reply

klyn

Iron rusting is an example of a ________ change.

Iron rusting is an example of a ________ change.

Iron rusting is an example of a ________ change.

DarciXero   50   1 Reply

007006

Liquid water changing to ice is an example of a ________ change.

Liquid water changing to ice is an example of a ________ change.

Liquid water changing to ice is an example of a ________ change.

lii   31   1 Reply

Guest