All categories

3 years ago

Which statement is true about the speed of light waves in a medium?

Chemistry

2 answers:

larisa86 [58]3 years ago

6 0

A) depends on temperture

katrin2010 [14]3 years ago

3 0

The answer is depends on the tempature

You might be interested in

Atomic fission requires temperatures of one million degrees or hotter. True False

pickupchik [31]

Answer: The correct answer is false.

Explanation:

Atomic fission reactions are defined as reactions in which nucleus of an atom splits into two or more smaller nuclei. These reactions are carried out in nuclear reactors. The temperature range for the reactors are around 300°C.

Atomic fusion reactions are the reactions in which nucleus of two or more atoms fuse together to form one large nuclei. These reactions require a huge amount of energy to occur. The temperature required by these reactions are about one million kelvins.

Hence, the given statement is False.

8 0

2 years ago

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 16.0 g of luminol to H2O creating

san4es73 [151]

Answer : The concentration of luminol in the solution is, 1.20 M.

Explanation : Given,

Mass of luminol = 16.0 g

Volume of solution = 75.0 mL

Molar mass of luminol = 177.16 g/mole

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :

$\text{Molarity}=\frac{\text{Mass of luminol}\times 1000}{\text{Molar mass of luminol}\times \text{Volume of solution (in mL)}}$

Now put all the given values in this formula, we get:

$\text{Molarity}=\frac{16.0g\times 1000}{177.16g/mole\times 75.0mL}=1.20mole/L=1.20M$

Therefore, the concentration of luminol in the solution is, 1.20 M.

4 0

3 years ago

For the reaction represented by the equation cl2 + 2kbr ® 2kcl + br2, calculate the percentage yield if 200. g of chlorine react

alexgriva [62]

The % yield if 200g of chlorine react with excess Potassium bromide to produce 410g of bromine is calculated as below

% yield = actual yield/theoretical yield x100
the actual yield = 410 grams

calculate the theoretical yield
by first calculate the moles of chlorine used

mole= mass/molar mass
molar mass of Cl2 = 35.5 x2= 71 g/mol

moles= 200g/71g/mol = 2.82 moles

cl2 +2 KBr = 2KCl +Br2

by use of mole ratio between Cl2 to Br2 which is 1:1 the moles of Br2 is also = 2.82 moles

theoretical mass = moles x molar mass
molar mass of Br2= 79.9 x2= 159.8 g/mol

moles= 2.82g x 159.8 g/mol = 450.64 grams

% yield is therefore = 410g/450.64 x100 = 90.98 %

5 0

2 years ago

CO2 + H2O - H2CO3 The reaction above is classified as

Elena L [17]

Answer:

Nonmetal oxides react with water to form oxyacids. Ex. CO2 + H2O → H2CO3 Page 3 Decomposition - compound (reactant) breaks down into 2 or more simpler substances.

3 0

2 years ago

Read 2 more answers

Which element is a liquid at 25 celsius degrees and 1.0 atm?

mojhsa [17]

The answer would be letter A - bromine. Bromine (Br2) has only london dispersion forces and are weak, but it's large electron cloud allows for transient polarization creating dipole moments that strengthen their interaction.

5 0

2 years ago