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klio [65]
3 years ago
13

a sample of double-stranded dna contains 42% cytosine. approximately what percent of the nucleotides in this sample will be thym

ine?
Chemistry
1 answer:
Simora [160]3 years ago
7 0

Answer:

8% thymine

Explanation:

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The temperature of 75 mL of gas is decreased from 450 K to 150 K while the pressure is held constant. What is the new volume of
irinina [24]

Answer: Option A) 25mL

Explanation:

Given that,

Original volume of gas (V1) = 75mL

Original temperature of gas (T1) = 450K

New volume V2 = ?

New temperature T2 = 150K

Since volume and temperature are given while pressure is held constant, apply the formula for Charle's law

V1/T1 = V2/T2

75mL/450K = V2/150K

To get the value of T2, cross multiply

75mL x 150K = 450K x V2

11250mL•K = 450K•V2

Divide both sides by 450K

11250mL•K / 450K = 450K•V2/450K

25mL = V2

Thus, the new volume of the gas is 25mL

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3 years ago
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What is the difference between 0.50 mol HCl and 0.50 M HCl?
iVinArrow [24]

Answer:

Here you go

Explanation:

6 0
3 years ago
Which is a disadvantage of using chemical indicators? they are expensive to use. they measure ph directly. they must be selected
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Chemical indicators are the chemical reagents that show the change in reaction by changing color. Chemical indicators must be chosen with a narrow pH range.

<h3>What are indicators?</h3>

Indicators are the solutions or the substances used for the qualitative and the quantitative measurement by a change in color because of the absence or the presence of the sample concentration.

The chemical indicators cannot detect the exact pH and should be used with a narrow range of pH.

Therefore, option C. the narrow range of pH is the disadvantage of chemical indicators.

Learn more about chemical indicators here:

brainly.com/question/15114406

4 0
2 years ago
The identity of an element is defined by its number of _______________. For example, every atom of Carbon has ___ protons and on
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In this order.
protons. 6. carbon atom. different. isotopes. atomic masses. same. chemical reaction. reactions. electrons. neutrons.
7 0
3 years ago
A sample of cobalt has a mass of 27 g and a density of 9 g/cm^3. What would be its volume?
8_murik_8 [283]
Given ,

Mass of sample of cobalt = 27 g

density of sample of cobalt = 9g/cm^3

We know that ,

Density = mass of sample/volume of sample

From that relation ,

We can deduce the following as

Volume = mass of sample/density of sample

Hence , required volume of sample of cobalt = 27 g /9 g/cm^3 = 3 cm^3

The volume is \fbox{3cm cube}
3 0
2 years ago
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