CHEMISTRY HIGH SCHOOL

What is the correct order of the scientific method?

Answers

Answer 1

Answer:

Answer:

make an observation
ask questions
form a hypothesis
predict your hypothesis
test your hypothesis prediction
make new modifications to your hypothesis (repeat the steps)

Explanation:

I hope this helps! :)))

Answer 2

Answer:

Final answer:

The scientific method, employed ubiquitously in scientific research including biology, starts with an observation. Based on this observation, a hypothesis is formed, tested through an experiment and if the results don’t support it, the hypothesis is adjusted.

Explanation:

The scientific method is a systematic way researchers, including experts in biology and other sciences, approach problem-solving and exploration. It is composed of a series of well-defined steps that typically starts with an observation and a question to research about the observed situation. Based on this, the Scientist devises a hypothesis, a proposed explanation. This hypothesis is then tested using an experiment, and the results of this experiment are reported. If the results do not support the hypothesis, a new hypothesis can be proposed.

Applying these steps to the car situation would look like the following:

Car doesn't start (Observation)
If the car doesn't start the problem might be in the battery. (Hypothesis)
The car should start after charging the battery or changing the battery (Experiment)
After changing the battery, the car starts working. (Reporting results)

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Related Questions

Evidence seems to show that life originated from chemicals? True or False
While camping up at Haloooo Mountain (5,500 feet above sea level), it generally takes Sandy about the same amount of time to boil water for her soup as it takes to make a sandwich. This week, Sandy is camping at a trail that is only about 200 feet above sea level. Sandy is very hungry and wants something to eat immediately. Should she make the soup or sandwich? Which would be ready more quickly and why?
Ammonia is a weak base because it produces ___ ions in solution
As the number of effective collisions between reacting particles increases the rate of reaction
Which structural formula represents 1,1 dibromopropane

Chlorine and element X have similar chemical properties. An atom of element X could have an electron configuration of(1) 2-2 (2) 2-8-1 (3) 2-8-8 (4) 2-8-18-7

Answers

An atom of element X will have an electron configuration of 2-8-18-7. Therefore, option (4) is correct.

What kinds of elements have similar chemical properties?

Those chemical elements present in the same group of the periodic table have similar chemical properties. Elements are placed in vertical columns that have the same number of electrons in their valence shell and identical chemical properties.

On the periodic table, the vertical columns are known as groups because of their identical chemical behavior. All the chemical elements of a group (1 to 18) have similar chemical properties.

The atomic number of chlorine is 17 and the distribution of electrons in its shells is 2, 8, 7. So, chlorine exhibits seven electrons in its outermost shell. Therefore, the atom which will carry seven electrons in its outermost shell will have identical chemical properties as that of chlorine.

Hence, out of the four options, the atom with electronic configuration 2-8-18-7 will have similar chemical properties as those of chlorine.

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Answer: Option (4) is the correct answer.

Explanation:

Chemical properties depend on the number of electrons present in the valence shell.

Atomic number of chlorine is 17 and electrons present in its shells are distributed as 2, 8, 7. So, there are 7 electrons present in the outermost shell.

Therefore, the atom which will also have 7 electrons present in its outermost shell or valence shell will have similar chemical properties as that of chlorine.

Hence, out of the given options atom with electronic configuration 2-8-18-7 will have similar chemical properties.

1)Ag (silver) tarnishes..physical or chemical property2)An apple is cut..physical or chemical property

Answers

Tarnishing of silver is a chemical property while an apple being cut is a physical property.

What are physical properties?

Any property which describes the state of a physical system is called as a physical property.Changes in physical properties are used to describe changes between the states. They are often related to as observable properties.

Physical property which can be quantified is a physical quantity. These are also classified further with respect to their directionality. Isotropic properties do not change with direction of observation while anisotropic properties change with direction of observation.

Physical properties are differentiated from chemical properties by the way they determine how a substance behaves in a chemical reaction.

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Ag tarnishing is a chemical change.(because the chemical composition of the silver is changing into a different one.). Apple being cut is a physical change because the chemical composition of the apple remains the same, but the apple itself changes to a smaller physical state.

The pH of a solution decreases by 2.0. How does the hydronium ion concentration of the solution change? increases to 2 times the original concentration
increases to 100 times the original concentration
decreases to 1/100 of the original concentration
decreases to 1/2 of the original concentration

Answers

Answer: The correct answer is 'increases to 100 times the original concentration'.

Explanation:

let the initial pH be x

The original concentration of $[H^+]$ initially present be y

$x=-log[y]$ ...(1)

Final concentration of $[H^+]$ when pH reduced by 2 be z

$x-2=-log[z]$ ...(2)

Putting the value of 'x' from (1) into (2) we get :

$-log[y]-2=-log[z]$

$z=10^2y=100y$

When pH of a solution decreases by 2.0, hydronium ion concentration of the solution increases to 100 times the original concentration

Answer:

B, is the answer

One way to remove nitrogen oxide from smokestack emissions is to react it with ammonia: 4 NH3 (g) + 6 NO (g) ----------> 5 N2 (g) + 6H2O (I)Fill in the blanks below:

12.3 mol of NO reacts with ______ mol of ammonia
5.87 mol of NO yields _______ mol nitrogen

Answers

Final answer:

12.3 moles of nitrogen oxide (NO) react with 8.2 moles of ammonia (NH3) in the given reaction. The reaction of 5.87 moles of NO yields 4.89 moles of nitrogen (N2).

Explanation:

The overall reaction equation represents an ideal stoichiometric ratio where 4 moles of ammonia (NH3) react with 6 moles of nitrogen oxide (NO) to produce 5 moles of nitrogen (N2) and 6 moles of water (H2O). Let's work with this ratio to fill in the blanks of your question.

Given that 6 moles of NO react with 4 moles of NH3, we can set up a ratio to find the unknown quantity of NH3 that reacts with 12.3 moles of NO: (4 NH3 / 6 NO) x 12.3 NO = 8.2 moles of NH3

Similarly, 5 moles of nitrogen are produced per 6 moles of NO reacted, so we can find out how much nitrogen is produced from 5.87 moles of NO: (5 N2 / 6 NO) x 5.87 NO = 4.89 moles of nitrogen.

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Final answer:

12.3 moles of NO reacts with 8.2 moles of Ammonia. 5.87 moles of NO yields 4.89 moles of Nitrogen.

Explanation:

In these types of problems, we use the concept of mole ratios from the balanced chemical equation. According to the reaction, 4 moles of NH3 react with 6 moles of NO to yield 5 moles of N2. Therefore, for 12.3 moles of NO, we apply the ratio 4/6 to determine that it reacts with 8.2 moles of NH3.

Similarly, 5.87 moles of NO, based on the ratio 5/6, yields 4.89 moles of N2. So, these are the missing quantities for the reaction.

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Which molecule is a source of energy, a store of energy, and can mix with water?

Answers

Answer:

Glucose

Explanation:

Glucose is a source of energy and it is stored in the body (in the form of glycogen) and it can also dissolve in water.

Which of these elements is the most reactive?potassium
calcium
titanium
scandium

Answers

Answer:

Scandium

Explanation:

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Complete and balance the following equation: BrO3−(aq)+N2H4(aq)→Br2(l)+N2(g)

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Find the mass of 3.00 mol of acetic acid, C2H4O2