A balanced chemical equation is in accordance with:

• Avogadro's law

• Law of conservation of mass

• Law of multiple proportions

• Law of reciprocal proportions

Tags

NGSS.HS-PS1-7

Law of constant proportion is also referred to as law of definite proportion

• True

• False

Which one of the following pair of substances illustrates law of multiple proportions?

• Calcium oxide and calcium hydroxide

• Sodium chloride and sodium bromide

• Carbon monoxide and carbon dioxide

• None of the above

Tags

NGSS.HS-PS1-7

2 elements C & D combines to form a compound CD. The same compound is obtained from different experiment. give the law in accordance to above observation

• law of conservation of mass

• law of constant proportion

• law of multiple proportion

The percentage of copper and oxygen in samples of “CuO” obtained by different methods were found to be the same. This illustrates the law of:

• Constant proportions

• Conservation of mass

• Multiple proportions

• Reciprocal proportions

Tags

NGSS.HS-PS1-7

The dense, positively charged mass located in the center of the atom.

• nucleus
• proton
• isotope
• molecule

Atoms of the same element must always have the same number of _________

• electrons
• neutrons
• isotopes
• protons

The nucleus of an atom contains which subatomic particles?

• protons and electrons

• protons and neutrons

• electrons and neutrons

• protons, electrons, and neutrons

Tags

NGSS.MS-PS1-1

Typically in an atom, which two subatomic particles are equal in number?

• protons and neutrons

• all subatomic particles are equal in number

• neutrons and electrons

• protons and electrons

Tags

NGSS.MS-PS1-1

Which subatomic particle is counted to determine the type of element the atom represents?

• proton

• neutron

• electron

• boron

Tags

NGSS.MS-PS1-1