Which of the following is an experiment? A) measuring the mean and standard deviation of measurements from a sample

B) generating outcomes based on some model of how they are really produced

C) comparing the outcomes of two different treatment protocols

D) recording the high and low temperature at a particular location every day

Answers

Answer 1

Answer:

Answer: D) recording the high and low temperature at a particular location every day.

Explanation:

A experiment is a process which is conducted or performed to either support, refute or validate the hypothesis. It involves the detail repeatable procedure and the logical analysis of the outcomes of the results. It involves different variables which are compared to obtain the outcome of the experiment. For example the amount of water used everyday responsible for the plant height.

Among the options given, D) recording the high and low temperature at a particular location every day. is the correct option, temperature is a variable in the experiment. The change in the daily temperature of a location can be noted as observation of the experiment. This observation can be used to record the average temperature of the location.

Answer 2

Answer: D! because when you record something you will probably analyze the results and those are two big KEY components of an Experiment!

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Calculate the number of moles 3.16 g of KMnO4 32.33 g of K2CrO4 100 g of KHCO3

Answers

The number of moles:
3.16g of $KMnO_(4)$
1 mole of $KMnO_(4)$ - 158g.
x moles of $KMnO_(4)$ - 3.16g.
$x=(1\ mole*3.16g)/(158g)=(3.16)/(158)=0.02\ mole$

The number of moles:
32.33g of $K_(2)CrO_(4)$
1 mole of $K_(2)CrO_(4)$ - 194g.
x moles of $K_(2)CrO_(4)$ - 32.33g.
$x=(1\ mole*32.33g)/(194g)=(32.33)/(194)=0.17\ mole$

The number of moles:
100g of $KHCO_(3)$
1 mole of $KHCO_(3)$ - 100.1g.
x moles of $KHCO_(3)$ - 100g.
$x=(1\ mole*100g)/(100.1g)=(100)/(100.1)=0.999\ mole$

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Acid precipitation can be traced back to the burning of fossil fuels.
a. True
b. False

Answers

The statement that ‘Acid precipitation can be traced back to the burning of fossil fuels.’ Is true. The answer is letter A. Burning of fossil fuels may emit harmful gases that is toxic to the atmosphere and the surrounding beings.

Final answer:

Acid precipitation is caused by the release of pollutants such as sulfur dioxide and nitrogen oxides when fossil fuels are burned. These pollutants combine with water in the atmosphere to form acids, which can fall to the earth as precipitation.

Explanation:

The statement in the question is True. Acid precipitation can indeed be traced back to the burning of fossil fuels. When we burn fossil fuels like coal, oil, and gas, they release pollutants into the atmosphere. These pollutants include sulfur dioxide and nitrogen oxides, which can combine with water in the atmosphere to form sulfuric acid and nitric acid. These acids can fall to the earth in the form of precipitation, such as rain, snow, or fog, hence the term 'acid precipitation'. This process can have harmful impacts on the environment, including pollution of bodies of water and damage to vegetation.

Learn more about Acid Precipitation here:

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How to know if two elements will form a covalent bond

Answers

Answer:

If they are both non-metals

Explanation:

covalent = non-metal + non-metal

ionic = metal +non-metal

metallic = metal +metal

What mass of anhydrous solute is needed to prepare 500 mL of 0.032 M NaF(aq)? Answer in units of g.

Answers

Volume 500 mL in liters : 500 / 1000 = 0.5 L

Molar Mass NaF = 41.98 g/mol

Molarity = 0.032 M

Mass = Molarity * molar mass * volume

Mass = 0.032 * 41.98 * 0.5

= 0.67168 g of NaF(aq)

hope this helps!

Which sample of HCl(aq) contains the greatest number of moles of solute particles?(1) 1.0 L of 2.0 M HCl(aq)
(2) 2.0 L of 2.0 M HCl(aq)
(3) 3.0 L of 0.50 M HCl(aq)
(4) 4.0 L of 0.50 M HCl(aq)

Answers

The answer is (2) 2.0 L of 2.0 M HCl (aq). The number of moles of solute particles equals to the volume multiply the concentration of the solution. After the calculation, you can get the right answer.

Answer:

Explanation:

The gases listed are at standard temperature and pressure: · 1 mol of CO2 gas · 1 mol of N2 gas · 2 mol of O2 gas Which statement is correct? The volume of 1 mol of CO2 is greater than that of 2 mol of O2 . The volume of 1 mol of CO2 is greater than that of 1 mol of N2 . The volumes of 2 mol of O2 and 1 mol of N2 gases are the same. **The volumes of 1 mol of CO2 and 1 mol of N2 gases are the same.**

Answers

Answer : The volume of 1 mole of $CO_(2)$ and $N_(2)$ gases are the same.

Solution: Given,

Moles of $CO_(2)$ = 1 mole

Moles of $N_(2)$ = 1 mole

Moles of $O_(2)$ = 2 mole

Formula used for ideal gas is :

P V = n R T

According to the question, the gases are at standard temperature and pressure. So, the volume of gases only depends on the number of moles. This means that the higher the number of moles, higher will be the volume of gas.

The moles of $O_(2)$ are more than the moles of $CO_(2)$ and $N_(2)$ . So, the volume of $O_(2)$ will be more.

And the moles of $CO_(2)$ and $N_(2)$ are equal. Therefore, their volumes are also equal.

Therefore, the best option is the volume of 1 mole of $CO_(2)$ and $N_(2)$ gases are the same.

The right answer for the question that is being asked and shown above is that: "The volumes of 1 mol of CO2 and 1 mol of N2 gases are the same." The statement that is correct as far as the gases listed are at standard temperature and pressure is concerned is that the volumes of 1 mol of CO2 and 1 mol of N2 gases are the same

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