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miskamm [114]
2 years ago
6

Sara has a red jacket. Which of the following models shows how Sara's jacket reflects and/or absorbs light?

Chemistry
2 answers:
just olya [345]2 years ago
7 0
I think it’s C. , C. Should be right because the red jacket is absorbing the light
Sonja [21]2 years ago
7 0

Answer:

answer choice c

Explanation:

the colors we see are the ones that are reflected off the object

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For each of the following acid-base reactions,
Sophie [7]

Answer: A. 3.28 g of HCl

B. 6.30 g of HNO_3

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}    

\text{Moles of} NaOH=\frac{3.65g}{40g/mol}=0.09moles

\text{Moles of} Ca(OH)_2=\frac{3.65g}{74g/mol}=0.05moles

a) HCl(aq)+NaOH(aq)\rightarrow H_2O(l)+NaCl(aq)  

According to stoichiometry :

1 mole of NaOH require = 1 mole of HCl

Thus 0.09 moles of NaOH will require=\frac{1}{1}\times 0.09=0.09moles  of HCl

Mass of HCl=moles\times {\text {Molar mass}}=0.09moles\times 36.5g/mol=3.28g

b) 2HNO_3(aq)+Ca(OH)_2(aq)\rightarrow 2H_2O(l)+Ca(NO_3)_2(aq)  

According to stoichiometry :

1 mole of Ca(OH)_2 require = 2 moles of HNO_3

Thus 0.05 moles of Ca(OH)_2 will require=\frac{2}{1}\times 0.05=0.1moles  of HNO_3

Mass of HNO_3=moles\times {\text {Molar mass}}=0.1moles\times 63g/mol=6.3g

6 0
1 year ago
How many grams of N2 are required to produce 100.0 L of NH3 at STP? 6.25 g
valentina_108 [34]
Given: N2, volume of 1L of NH3 at STP Required: Grams of N2 Solution: N2 + 3H2 -> 2NH3 Molar mass of N2 = 28g From the ideal gas equation PV = nRT n = PV/RT n = (1 atm)(100 L)/(0.08206 L-atm/mol-K)(273K) n = 4.46 mol of NH3 from the reaction, we need 2 moles of NH3 to get 1 mole of N2 4.46 mol NH3(1 mol N2/2 mol NH3) = 2.23 moles N2 2.23 moles of N2(28 g N2/1 mol N2) = 62.5g N2
5 0
2 years ago
A vessel of volume 100 cm3 contains 0.25 mol o2 and 0.034 mol co2 at 10.0c. Calculate the partial pressure of each component and
Artyom0805 [142]

Answer: The partial pressure of oxygen is 76.56 atm , partial pressure of carbon dioxide is 10.44 atm and the total pressure is 87 atm.

Explanation:

According to the ideal gas equation:'

PV=nRT

P = Pressure of the gas = ?

V= Volume of the gas = 100cm^3=0.1L 1L=1000cm^3

T= Temperature of the gas = 10°C = 373 K      

R= Gas constant = 0.0821 atmL/K mol

n=  moles of gas= 0.25 +0.034 = 0.284 moles

P=\frac{nRT}{V}=\frac{0.284\times 0.0821\times 373}{0.1}=87atm

x_{O_2} = mole fraction of oxygen=\frac{\text {moles of }O_2}{\text {moles of }O_2+\text{moles of }CO_2}=\frac{0.25}{0.25+0.034}=0.88,  

x_{CO_2} =mole fraction of carbon dioxide=\frac{\text {moles of }CO_2}{\text {moles of }O_2+\text{moles of }CO_2}=\frac{0.034}{0.25+0.034}=0.12

partial pressure of oxygen = p_{O_2}=x_{O_2}\times P=0.88\times 87=76.56atm

partial pressure of carbon dioxide= p_{CO_2}=x_{CO_2}\times P=0.12\times 87=10.44atmatm

The partial pressure of oxygen is 76.56 atm , partial pressure of carbon dioxide is 10.44 atm and the total pressure is 87 atm.

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2 years ago
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Thermal emersion circulators is what it is called
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A cell membrane acts as a boundary between the cell and its external environment. What is another role of the cell membrane?
Naddika [18.5K]
The answer is D, it controls what comes in & out the cell, well i hope so!
4 0
1 year ago
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