IG CHEM chapter 1-5 review

Which change occurs during freezing?

• solid to liquid

• liquid to solid

• liquid to gas

• gas to liquid

Tags

NGSS.MS-PS1-4

A compound has the formula CH₃CH₂COH. What is its relative molecular mass, Mr?

• 58

• 57

• 74

• 73

Which two elements could form a covalent compound?

• sodium and fluorine

• calcium and bromine

• carbon and hydrogen

• chlorine and helium

Which changes are physical changes?

• melting ice

• burning wood

• painting wall

• break a window

What is the number of protons in ³¹P^- ?

• 16

• 31

• 15

What is the number of neutrons in ³¹P^- ?

• 16

• 31

• 15

What is the number of electrons in ³¹P^- ?

• 16

• 31

• 15

Tags

NGSS.HS-PS1-1

请拼写“元素”

(a)  

请拼写“浓度”

(a)  

Tags

NGSS.HS-PS1-5

An excess of zinc is added to 100 cm³ of 1.0 mol/dm³ hydrochloric acids. The equation for the reaction is:

Zn + 2HCl ---> ZnCl₂ + H₂

What is the maximum volume of hydrogen evolved at room temperature and pressure?

• 1.2 dm³

• 2.0 dm³

• 2.4 dm³

• 24 dm³