CHEMISTRY MIDDLE SCHOOL

!!!!HELP ASAP 10 points!!!Which of the following families contains liquids, solids, and gases?A. The alkali metals
B. The noble gases
C. The halogens
D. The alkaline earth metals

Answers

Answer 1
Answer: The halogens is correct
Answer 2
Answer:

Answer:

C. The halogens

Explanation:

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Easy Questions! Chemistry - Please help! I give thanks

Answers

this is not chemistry but

see it is a triangular prim on it's side
V=BH
are of base times height
the base is a triangle
height is 18.5

base=1/2bh
b=8.6
h=8.4
base=1/2(8.6)(8.4)
base=36.12

V=bh
V=36.12*18.5
V=668.22

round
V=668.2 ft^3
all sides have to be exact

How many molecules of isopently acetate C7H1402 are released (1x10^ -6g) in a typical bee sting

Answers

The  number of molecules of isopently acetate is  4.63  x 10¹⁵  molecules

 calculation

Step 1:  find the moles of isopently acetate( C₇H₁₄O₂)

moles  =  mass÷  molar mass

From periodic table the molar mass of C₇H₁₄O₂

= (12 x7 ) + (1 x14) +(16 x2) =130 g/mol

moles = 1 x10⁻⁶ g÷ 130 g/mol =  7  x 10⁻⁹ moles

step 2 ; use the Avogadro's  law  constant to calculate the number of molecules

That  is according to Avogadro's law  1 mole  = 6.02 x 10²³  molecules

                                                          7 x 10⁻⁹ moles = ?  molecules

by cross multiplication

= { (7 x 10⁻⁹ moles x  6.02 x10²³  molecules) / 1  mole} = 4.63 x 10¹⁵  molecules

Why should you keep the thermometer in the middle of a jar of water when you are taking the temperature. Why should you not put the thermometer in at the side?

Answers

You put in the middle bucause when you put it on the side it reads the temperature of the glass! 

Hopethis helps
You should put it in the middle of he jar beacuse if you put it in he side it will be difficult to understand

Part C
Why are dichotomous keys useful in classifying a new species?

Answers

Answer:

By comparing the traits of other species to that of an undefined species. Even if it is a new species, it can be classified under a specific species type through dichotomous keys.

Arc AB is One-sixth of the circumference of a circle. What is the radian measure of the central angle?A.)StartFraction pi over 6 EndFraction

B.)StartFraction pi Over 3 EndFraction

C.)StartFraction 2 pi Over 3 EndFraction

D.)StartFraction 5 pi Over 6 EndFraction

THE ANSWER IS B!!!

Answers

It’s b cause u said it

Answer:

?

Explanation:

What type of reaction does the following equation represent?FeS+2HCl→FeCl2+H2S
A. synthesis reaction
B. double-displacement reaction
C. single-displacement reaction
D. decomposition reaction

Answers

Answer:

B. double-replacement RXN

Explanation:

more specifically, this is a precipitation rxn.
Double-displacement because two elements are getting exchanged by the compounds. It is also a precipitation reaction because there seems to be an insoluble aqueous product.
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