Test
chemistry
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Preguntas del test (15)
1The nucleus of an atom is composed of
- Atightly packed protons
- Btightly packed neutrons
- CTightly packed protons and neutrons
- Dloosely connected protons and electrons
2The atomic number of an element is the total number of which particles in the nucleus?
- ANeutrons
- BProtons
- CElectrons
- DProtons and electrons
3Isotopes of the same element have different
- Anumbers of neutrons
- Bnumber of protons
- Cnumber of electrons
- Datomic numbers
4Isotopes are atoms of the same element that have different
- APrinciple chemical properties
- Bmasses
- CNumbers of protons
- DNumber of electrons
5The mass of a neutron is
- Aabout the same as that of a proton
- Babout the same as that of an electron
- Cdouble that of a proton
- Ddouble that of an electron
6The following is true about subatomic particles?
- AElectrons are negatively charged and are the heaviest subatomic particle
- BProtons are positively charged and have the lightest subatomic particle
- CNeutrons have no charge and are the lightest subatomic particle
- DThe mass of a neutron nearly equals the mass of a proton
7The smallest particle of an element that retains the properties of that element is an
- Aatom
- Belectron
- Cproton
- Dneutron
8All atoms of the same elements all have the same
- Anumber of neutrons
- Bnumber of protons
- Cmass number
- Dmass
9Atoms of Copper and Iron
- Atend to form anions
- BTend to form cations
- CHave stable electron configurations
- DGenerally form stable bonds with transition elements
10Which of the following particles are free to drift in metals?
- AProtons
- Bneutrons
- Ccations
- Delectrons
11Which of the following occurs in an ionic bond?
- ATwo atoms share more than 2 electrons
- BLike-charged ions atrract
- COppositely charged ions attract
- DTwo atoms share two valence electrons
12Which of the following is not a property of ionic compound?
- ALow boiling point
- BBrittle
- Chardness
- Dmolten compound conducts electricity
13The chemical bond formed when two atoms equally share one or more pairs of electrons is an
- APolar bond
- BIonic bond
- Cmetallic bond
- Dcovalent bond
14Compared with ionic compounds, molecular compounds
- AHave higher melting points
- Bare harder
- Chave lower melting points
- Dare brittle
15Which unit is used to measure radiation damage to human tissue?
- ARoentgen
- BRem
- CRad
- DHalf-life
Información
- Descripción
- Test sobre chemistry, creado por Xuan Pham el 09/10/2018.
- Autor
- Xuan Pham
- Idioma
- English
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