Which of the following can be changed in a chemical reaction?

What is the relationship between the frequency of electromagnetic waves and their wavelengths? A. As frequency increases, wavele

r-ruslan [8.4K]

Answer:

D. A and B

Explanation

as frequency is inversely proportional to wavelength. formula for calculating wavelength is

wavelength = wave velocity/frequency.

as wavelength is inversely proportional so increase in wavelength will cause decrease in frequency and vice versa . so A and B are the right answer.

4 0

3 years ago

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A solution contains an unknown mass of dissolved barium ions. When sodium sulfate is added to the solution, a white precipitate

AVprozaik [17]

Answer:

0.1388 g

Explanation:

The mass of $BaSO_4$ obtained on precipitation = 236 mg

1 mg = 0.001 g

Thus, Mass of $BaSO_4$ = 0.236 g

Molar mass of $BaSO_4$ = 233.43 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{0.236\ g}{233.43\ g/mol}$

Moles of $BaSO_4$ = 0.001011 moles

According to the reaction,

$Ba^{2+}+SO_4{2-}\rightarrow BaSO_4$

Thus, moles of barium = 0.001011 moles

Molar mass of barium = 137.327 g/mol

Thus, Mass = Moles * Molar mass = 0.001011*137.327 g = 0.1388 g

4 0

3 years ago

A plot of velocity versus substrate concentration for a simple enzyme-catalyzed reaction produces a _____. This indicates that a

kirza4 [7]

Answer:

B) hyperbolic curve; saturated with substrate

Explanation:

Enzymatic kinetics studies the speed of enzyme catalyzed reactions. These studies provide direct information about the mechanism of the catalytic reaction and the specificity of the enzyme. The speed of a reaction catalyzed by an enzyme can be measured with relative ease, since in many cases it is not necessary to purify or isolate the enzyme. The measurement is always carried out under the optimal conditions of pH, temperature, presence of cofactors, etc., and saturating substrate concentrations are used. Under these conditions, the reaction rate observed is the maximum speed (Vmax). The speed can be determined either by measuring the appearance of the products or the disappearance of the reagents.

Following the rate of appearance of product (or disappearance of the substrate) as a function of time, the so-called reaction progress curve is obtained, or simply, the reaction kinetics. This curve is represented by a hyperbolic curve

5 0

3 years ago

The most highly concentrated hydrochloric acid is 12 M. What volume of a 12 M stock solution of HCL should be diluted in order t

Reika [66]

The Anderlecht is A. Thank you

8 0

2 years ago

If 5.0 liters H2 (g) at STP is heated to a temperature of 985, pressure remaining constant, the new volume of the gas will be?

vlada-n [284]

Answer:

$V_2=18 \ L \ H_2$