chemistry

A concise verbal or mathematical statement of a relationship between phenomena that is always the same under the same conditions is referred to as

• a hypothesis

• a law

• a theory

• none of the above

A tentative explanation for a set of observations that can be tested by further experimentation is referred to as

• a hypothesis

• a law

• a theory

• none of the above

A unifying principle that explains a body of facts and relations is referred to as

• a hypothesis

• a law

• a theory

• none of the above

Tags

NGSS.HS-LS4-2

Complete the following sentence. A scientific law is

• a tentative explanation for a set of observations that can be tested by further experimentation.

• a statement describing a relationship between phenomena that is always the same under the same conditions.

• a unifying principle that explains a body of facts and relations.

• a model used to visualize the invisible.

Tags

NGSS.HS-PS2-1

Complete the following sentence. A hypothesis is

• a tentative explanation for a set of observations that can be tested by further experimentation.

• a statement describing a relationship between phenomena that is always the same under the same conditions.

• a unifying principle that explains a body of facts and relations.

• a model used to visualize the invisible.

Tags

NGSS.HS-PS1-2

Complete the following sentence. A theory is

• a tentative explanation for a set of observations that can be tested by further experimentation.

• a statement describing a relationship between phenomena that is always the same under the same conditions.

• a unifying principle that explains a body of facts and relations.

• a model used to visualize the invisible.

Choose the response that includes all the items listed below that are pure substances.

i. orange juice ii. steam iii. ocean water iv. oxygen

v. vegetable soup

• i, iii, v

• ii, iv

• i, iii, iv

• iv only

Which one of the following is an example of a physical property?

• dynamite explodes

• meat rots if it is not refrigerated

• gasoline burns

• ice floats on top of liquid water

Which of the following does not represent a chemical change?

• a freshly cut apple turns brown

• milk turns sour on standing at room temperature

• when cooled to 0°C, liquid water becomes ice

• frying an egg

Tags

NGSS.MS-PS1-2

The SI prefixes nano and deci represent, respectively:

• 10^–9 and 10^–1.

• 10⁹ and 10^–6.

• 10⁶ and 10^–3.

• 10³ and 10^–3.