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3 years ago

The interaction of two or more drugs at the same receptor site in which one blocks the action of the other is

Chemistry

2 answers:

lozanna [386]3 years ago

8 0

synergism is the interaction of two or more drugs at the same receptor site in which one blocks the action

dimulka [17.4K]3 years ago

6 0

Answer:

The correct option is b

Explanation:

Antagonism is caused when a chemical (in this case drug) causes the opposite effect of another chemical (in this case drug) or blocks the effect of another chemical/drug.

A commonly used example of antagonism is the opposing effects of insulin and glucagon in the body; Insulin lowers blood sugar level but glucagon raises same in the body.

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The half life for the radioactive decay of potassium- to argon- is years. Suppose nuclear chemical analysis shows that there is

Semmy [17]

Answer:

Therefore, the age of the rock sample is 2.7 * 10⁹ years

<em>Note: The question is missing some parts. The complete question is:</em>

<em>The half-life for the radioactive decay of potassium-40 to argon-40 is 1.26 * 10⁹ years. Suppose nuclear chemical analysis shows that there is 0.771 mmol of argon-40 for every 1.000 mmol of potassium-40 in a certain sample of rock. Calculate the age of the rock. Round your answer to significant digits.</em>

Explanation:

Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value.

In radioactive isotopes of elements, the half-life is used to calculate the age of the materials in which the radioisotopes are found.

The half-life is related to the age of a material through the following formula:

t = t½㏑(Nt/N₀) / -㏑2

where t is the age of the material;

t½ is the half-life of the material

Nt is the amount of material left after time t

No is the starting amount of material

From the question:

t½ = 1.26 * 10⁹ years

Nt = 1.000 - 0.771 = 0.229

N₀ = 1.000

-㏑2 = -0.693

t = {1.26 * 10⁹ * ㏑(0.229)} / -0.693

t = 2.68 * 10⁹ which is approximately 2.7 * 10⁹ years to two significant digits.

Therefore, the age of the rock sample is 2.7 * 10⁹ years

8 0

3 years ago

A West Virginia coal is burned at a rate of 8.02 kg/s. The coal has a sulfur content of 4.40 % and the bottom ash contains 2.80

aleksley [76]

Answer: The annual emission rate of SO2 is 1.08 × $10^{7}$ kg/yr

Explanation:

The rate <em>r</em> at which the coal is been burnt is 8.02 kg/s.

Amount of sulphur in the burning coal is given as 4.40 %

i.e., 4.4/100 × 8.02 = 0.353 kg/s. Which is equivalent to the rate at which the sulphur is been burnt.

Since the burning of sulphur oxidizes it to produce SO2, it follows that the non-oxidized portion of the sulphur will go with the bottom ash.

The bottom ash is said to contain 2.80 % of the input sulphur.

Hence the portion of the SO2 produced is 100 — 2.80 = 97.20 %.

The rate of the SO2 produced is percentage of SO2 × rate at high sulphur is been burnt.

= 97.20/100 × 0.353 kg/s.

= 0.343 kg/s.

To get the annual emission rate of SO2, we convert the kg/s into kg/yr.

1 kg/s = 1 kg/s × (60 × 60 × 24 × 365) s/yr

1 kg/s = 31536000 kg/yr

Therefore, 0.343 kg/s = 0.343 × 31536000 kg/yr

= 10816848 kg/yr

= 1.08 × 10^7 kg/yryr.

5 0

3 years ago

Which observation most likely indicates that only a chemical change has taken place

salantis [7]

The correct answer as to which observation most likely indicates that only a chemical change has taken place would that the change cannot be reversed.

When it comes to changes in a system, it can either be:

physical change
chemical change

When a substance undergoes a physical change, the original version of the substance can be recovered. In other words, physical changes can be reversible.

When a substance undergoes a chemical change, the original version cannot be recovered because an entirely new product would have been formed. In other words, chemical changes are irreversible.

Thus, once a change becomes irreversible, such a change is said to be a chemical change.

More on chemical change can be found here: brainly.com/question/1161517

4 0

2 years ago

But you're so prideful, yeah, prideful

lara31 [8.8K]

Answer:

was there a question you needed help with?

5 0

3 years ago

If one or more nucleotide pairs are deleted from a dna strand, this is known as a:_________

Leya [2.2K]

If one or more nucleotide pairs are deleted from a DNA strand, this is known as a frameshift mutation

<h3>Define Frameshift Mutation</h3>

Insertions or deletions in the genome that are not multiples of three nucleotides are referred to as frameshift mutations. They are a particular class of insertion-deletion (indel) alterations that are present in polypeptides' coding sequences. Here, there are no multiples of three in the number of nucleotides that are added to or subtracted from the coding sequence. They may result from really basic alterations like the insertion or deletion of a single nucleotide.

<h3>Frameshift mutations' effects</h3>

One of the most harmful modifications to a protein's coding sequence is a frameshift mutation. They are quite prone to produce non-functional proteins that frequently interfere with a cell's metabolic processes and result in significant alterations to polypeptide length and chemical makeup. Frameshift mutations can cause the mRNA to stop translating too soon and create an extended polypeptide.

Learn more about Frameshift mutations here:-

brainly.com/question/12732356

#SPJ4

4 0

1 year ago