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Lostsunrise [7]
3 years ago
5

Alexis was interested in the way mirrors reflect. The living room of Alexis' house had one big window in the front, and a very l

arge mirror on the back wall. Alexis hypothesized that the room would heat up faster in the morning with the mirror on the wall than it would if the mirror were covered with a sheet that was the same color as the walls.
What will make Alexis' hypothesis valuable?

a It cannot be valuable because the investigation is in her house and not in the science lab.
b Any testable hypothesis is valuable.
c It will be valuable only if it is proved incorrect.
d It will be valuable only if it is proved correct.
Chemistry
2 answers:
MrRissso [65]3 years ago
8 0

Answer:

Any testable hypothesis is valuable.

Explanation:

Phoenix [80]3 years ago
7 0
It will only be valuable if proved correct so it's D
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Sulfur has an atomic mass of 32 u and Avogadro's number is 6 × 1023 formula units/mole. The number of sulfur atoms in 1 g of sul
Vikki [24]

Answer:

The number of sulfur atoms in 1 g of sulfur is:- 1.875\times 10^{22} atoms

Explanation:

Avogadro’s number represent the number of the constituent particles which are present in one mole of the substance. It is named after scientist Amedeo Avogadro and is denoted by N_0.

Avogadro constant:-

N_a=6\times 10^{23}

Given atomic mass of sulfur = 32 u

Which means that:-

32 g of sulfur contains 6\times 10^{23} of atoms

Also,

1 g of sulfur contains \frac {6\times 10^{23}}{32} of atoms

<u>So, The number of sulfur atoms in 1 g of sulfur is:- 1.875\times 10^{22} atoms</u>

6 0
3 years ago
In Ionic compounds,metals____ valence electrons and nonmetals_____ valence electron
LuckyWell [14K]

Answer:

bf v

Explanation:

bgf

5 0
3 years ago
If 25.0 mL of a 2.00 M CaCl2 solution is used for the reaction
RideAnS [48]

0.1 moles of chloride ions were involved  in the reaction if 25.0 mL of a 2.00 M CaCl2 solution is used for the reaction.

Explanation:

Data given:

volume of CaCl_{2} = 25 ml 0r 0.025

molarity of the calcium chloride solution = 2M

number of chloride ions =?

Balance chemical reaction:

Ca + 2Cl_{2} ⇒Ca_{} Cl_{2}

number of moles in 25 ml is calculated as:

molarity = \frac{number of moles}{volume}

number of moles of calcium chloride  = molarity x volume

putting the values in the equation:

number of moles = 2 x 0.025

                            = 0.05 moles of calcium chloride

1 mole of  CaCl_{2}  decomposes as 1 calcium ion and 2 chloride ions

so 0.05 moles will have x moles of chloride ion

\frac{2}{1} = \frac{x}{0.05}

x= 0.1

0.1 moles of chloride ions will be involved in the reaction.

5 0
3 years ago
What is the concentration of a solution prepared by dissolving 100g of sorbitol in 1000 ml of water?
disa [49]

first you divide them together and get an answer of 10 then you times it by 5 and your answer is   50 ml


7 0
3 years ago
If an atom has an atomic number of 17 and a mass of 35, how many neutron does it have?
Marysya12 [62]

Answer:

18

Explanation:

(atomic number = protons) mass minus protons= neutrons.

7 0
3 years ago
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