CHEMISTRY HIGH SCHOOL

Describe the difference between chronic and acute exposure.

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Answer 1
Answer: "Radiation exposure might be short-term or long-lasting. First, think of a medical x-ray exposure where the time of exposure is short—the machine is on and off within a very short period of time. Or think about radioactive materials that naturally occur in our soils; they present us with small amounts of radiation exposure that occur over our lifetime. Depending on the source, time of an exposure can vary—in some cases, the time will be very short, seconds or less, and in other cases it will be occurring continuously over our lifetime. Keep in mind that being exposed to radiation in a short period of time or over a long period of time is no indication of the total radiation dose and, thus, the possible health effects that may occur."
Answer 2
Answer:

Answer: chronic is long term and severe while acute lasts for a short amount of time.

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Atoms in a stay in a fixed position and have no freedom to move.
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Mark and Ann took a two week hiking trip through Yosemite National Park. While hiking through the park they witnessed two large blocks of rock break away from Glacier Point. What is the initial transfer of energy that accelerates the rock down the side of the mountain?

A catalyst works by(1) increasing the potential energy of the reactants(2) increasing the energy released during a reaction(3) decreasing the potential energy of the products(4) decreasing the activation energy required for a reaction

Answers

Answer: Option (4) is the correct answer.

Explanation:

Activation energy is the minimum amount of energy required by reactant molecules to undergo a chemical reaction.

Whereas a catalyst is defined as the substance that helps in increasing the rate of reaction by decreasing the activation energy without itself getting consumed in the reaction.

When a catalyst decreases the activation energy then molecules with lesser energy become able to participate in the reaction and thus, products are obtained at a faster rate. Hence, a catalyst increases the rate of a reaction.

Thus, we can conclude that a catalyst works by decreasing the activation energy required for a reaction.
The catalyst (4) decreases the activation energy required for a reaction, by holding reactants in place

For metalloids on the periodic table, how do the group number and the period number relate? A. The lower the group number, the lower the period numbers, so the metalloids are found in a diagonal moving down from left to right.
B.The lower the group number, the higher the period numbers, so the metalloids are found in a diagonal moving up from left to right.
C.The higher the group number, the lower the period numbers, so the metalloids are found in a diagonal moving down from left to right.
D.The higher the group number, the higher the period numbers, so the metalloids are found in a diagonal moving up from left to right.

Answers

Answer : The correct option is A.

Explanation :

Metalloid : Metaloids are the elements whose properties lie between the metals and non-metals.

There are six commonly elements which are boron, silicon, germanium, arsenic, antimony and tellurium. The rare elements are polonium and astatine.

The relation between the group number and period number of metalloid is that the lower the group number, the lower the period numbers and the metalloids are found in a diagonal moving down from left to right in the periodic table.

Answer:

(A) The lower the group number, the lower the period numbers, so the metalloids are found in a diagonal moving down from left to right.

Explanation:

Search up a periodic table and you will see.

I also took the quiz and got 100.

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How do the energy and the most probable location of an electron in the third shell of an atom compare to the energy and the most probable location of an electron in the first shell of the same atom?(1) In the third shell, an electron has more energy and is closer to the nucleus.
(2) In the third shell, an electron has more energy and is farther from the nucleus.
(3) In the third shell, an electron has less energy and is closer to the nucleus.
(4) In the third shell, an electron has less energy and is farther from the nucleus.

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The answer is (2). You can think about this question in terms of the Bohr's model of the atom or in terms of quantum chemistry. In the Bohr model, electrons exist in discrete "shells," each respresenting a fixed spherical distance from the nucleus in which electrons of certain energy levels orbit the nucleus. The larger the shell (the greater the "orbit" radius), the greater the energy of the "orbiting" electron (I use quotations because electrons don't actually orbit the nucleus in the traditional sense, as you may know). Thus, according to the Bohr model, a third shell electron should be farther from the nucleus and have greater energy than an electron in the first shell.The quantum model is differs drastically from the Bohr model in many ways, but the essence is the same. A larger principal quantum number indicates 1) greater overall energy and 2) a probability distribution spread a bit more outward.

PLEASE HELP ME!!! AAHH IM TRAPPED

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what exactly do you need help with?Your question is quite open ended.

Answer:

you got out?

Explanation:

PLEASE HELP WITH THIS ASAP

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radio waves
microwaves
infrared
ultraviolet
X-rays
gamma-rays

14. How do scientists know that the universe is expanding? The galaxies are moving away from each other, and the temperatures are decreasing. The galaxies are moving away from each other, and the temperatures are increasing. The galaxies are moving toward each other, and the temperatures are increasing. The galaxies are moving toward each other, and the temperatures are decreasing.

Answers

The universe is expanding is as the galaxies are moving away from each other, and the temperature of the universe is decreasing. Therefore, option (1) is correct.

How is the universe expanding?

First scientists theorized that as the universe is expanding and its temperature has gradually decreased. The universe has been expanding since the Big Bang and, as it expands, it’s temperature cooling down.

The temperature of the universe can be measured by looking at the cosmicmicrowave background (CMB). The temperature an be estimated by the thermal radiation left over from the BigBang.

The CMB scientists have been investigating that its temperature has been dropping off gradually as our universe expands out and the current average temperature of the cosmos is estimated about 2.73 Kelvin.

The point of the Big Bang from the Big bang theory is described as densesingularity and infinitely hot. The energy from the Big Bang distributed as the universe expands and gives the cooling effect.

But new research suggests otherwise that the temperature of the earth is actually increasing as it expands.  Therefore, the temperature of universe increasing with its expansion.

Learn more about universe expanding, here:

brainly.com/question/14965302

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the galaxies are moving away from each other and the temps are decreasing
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