Derrick just got home from playing soccer on a muddy field. He is curious how different brands of laundry detergent compare in removing mud from clothes, so he sets up an experiment. In one laundry load, he puts his muddy socks with Brand A detergent. In the next load, he puts his muddy jersey with Brand B detergent. In the final load, he puts his muddy shorts with Brand C detergent. Afterward, he noticed that the jersey came out the cleanest. He concludes that Brand B is the best detergent for removing mud from clothes. Is his conclusion valid? A. No; Derrick was biased toward Brand B. B. No; there were too many variables in the experiment. C. No; there were too many controls in the experiment. D. Yes; the experiment was set up correctly.

Final answer:

Niobium has five unpaired electrons, with one electron from the 5s orbital and four electrons from the 4d orbitals, following Hund's rule.

Explanation:

The student asked about the number of unpaired electrons in niobium. Niobium (Nb) has the atomic number 41, which means its electron configuration is [Kr]4d45s1. In the niobium atom, there are five electrons in its outermost d and s orbitals, out of which one can be found in the 5s orbital and four in the 4d orbitals. According to Hund's rule, which states that every orbital in a subshell is singly occupied before any orbital is doubly occupied and all electrons in singly occupied orbitals have the same spin, we can expect at least one unpaired electron in niobium due to its electron configuration.

To determine the exact number of unpaired electrons, we need to look more closely: the single electron in the 5s orbital is unpaired, and within the 4d subshell, which can hold up to 10 electrons, there are four electrons. These will occupy the first four orbitals singly before pairing up, resulting in four unpaired electrons from the 4d subshell. Therefore, niobium has a total of five unpaired electrons, one from the 5s orbital and four from the 4d orbitals.

The energy transformation that occurs as chicken cooks is a conversion of chemical energy from the heat source into thermal energy, which cooks the chicken. Not all of the energy converts to thermal energy for cooking, as some is lost to the environment.

As chicken cooks, there is an important transformation of energy that occurs. The heat from the stove is transferred to the pot and the chicken itself. This process is an example of thermal energy transfer. Specifically, chemical energy from the heat source (like gas or electricity) is converted into thermal energy, which is then absorbed by the chicken, causing the temperature of the chicken to rise and cook through.

In the kitchen, this conversion of energy type is critical in cooking all types of food, not just chicken. The energy transfer process ensures that the food changes from a raw state to a cooked state by the increased thermal energy breaking down proteins and killing bacteria, making the chicken safe to eat and more digestible.

It's important to note that during this energy transformation, not all energy is directly converted into thermal energy for cooking; some of it is lost to the environment. This demonstrates the concept of energy efficiency and that not all systems are 100% efficient.

The energy transformation happening as the chicken cooks is the conversion of electrical or chemical energy into thermal energy, which then cooks the chicken by denaturing its proteins.

The energy transformation that occurs as the chicken cooks involves converting electrical energy (if using an electric stove) or chemical energy (if using a gas stove) into thermal energy. This thermal energy is then transferred from the heat source to the chicken. As the heat is applied, the thermal energy cooks the chicken by breaking down its proteins and fats, causing a physical and chemical change in the chicken's structure. This transfer and transformation of energy are part of why the cooking process takes place.

To be more precise, when you turn on your stove, electrical energy or the chemical energy from natural gas is transformed into heat energy by the stove's heating element or burner. Then, as you place the chicken on the stove, energy is transferred as heat from the hot stove element to the cooler pot or pan, and eventually to the chicken itself. The heat cooks the chicken through processes such as denaturation of proteins, which alters the texture and flavor of the meat.

Answer:

- Hardness

Hardness is a mineral’s ability to resist being scratched. Minerals that are not easily scratched are hard. You test the hardness of a mineral by scratching its surface with a mineral of a known hardness. Mineralogists use the Mohs Hardness Scale, shown in Table below, as a reference for mineral hardness. The scale lists common minerals in order of their relative hardness. You can use the minerals in the scale to test the hardness of an unknown mineral.

Mohs Hardness Scale

As you can see, diamond is a 10 on the Mohs Hardness Scale. Diamond is the hardest mineral; no other mineral can scratch a diamond. Quartz is a 7. It can be scratched by topaz, corundum, and diamond. Quartz will scratch minerals that have a lower number on the scale. Fluorite is one. Suppose you had a piece of pure gold. You find that calcite scratches the gold. Gypsum does not. Gypsum has a hardness of 2 and calcite is a 3. That means the hardness of gold is between gypsum and calcite. So the hardness of gold is about 2.5 on the scale. A hardness of 2.5 means that gold is a relatively soft mineral. It is only about as hard as your fingernail.

Mohs Scale

Hardness Mineral

1 Talc

2 Gypsum

3 Calcite

4 Fluorite

5 Apatite

6 Orthoclase feldspar

7 Quartz

8 Topaz

9 Corundum

10 Diamond

sorry im so late -_-ll

Answer:

remains constant

You have this in Chemistry. It should be in physics, but never mind that.

A

d = 4 km due east. See note for part B.

t =  45 minutes = 3/4 hour

v = ??

d = v * t

4 = v * (3/4)

v = 4/(3/4) = 4 * 4/3 = 16/3 = 5 1/3

So his rate of travel is 5 1/3 km/hr due east. If you do not give the direction when it says velocity, you are wrong. Velocity has direction.

B

10 45 to 11 45 is 1 hour.

d = v * t

d = 6 km due south (this is actually a displacement which also has direction). 

t = 1 hour

6 = v * (1)

6/(1) = v

6/(1) = v

v = 1 km/ hr due south 

Factors that determine sound intensity are amplitude and the distance.

Amplitude 
Amplitude depends on the starting energy of the sound wave. If the amplitude is high then the intensity will be high.

Distance
Distance is the measure of how far does the sound wave travel from its source. If the distance is high then the intensity will be low.

Considering the definition of the Law of Conservation of Matter, the correct answer is option D. Atoms of each element are conserved, so the total mass does not change.

The Law of Conservation of Matter is also called the law of conservation of mass or the Law of Lomonósov-Lavoisier. This law postulates that "the mass is not created or destroyed, only transformed."  

This means that the reagents interact with each other and form new products with physical and chemical properties different from those of the reagents because the atoms of the substances are ordered differently. But the amount of matter or mass before and after a transformation (chemical reaction) is always the same, that is, the quantities of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends.  

In other words, then the mass before the chemical reaction is equal to the mass after the reaction. The exception to the rule is nuclear reactions, in which it is possible to convert mass into energy and vice versa.

Taking into account the above, the correct answer is option D. Atoms of each element are conserved, so the total mass does not change.

Learn more:

According to Boyle's law:

Pressure of given mass of ideal gas is inversely proportional to its volume at a constant temperature.

That can be represented as:

PV=Constant

Where P represents pressure, V represents volume.

Here as the volume increases that is from 20 L to 27 L, So pressure must decreases, so the original pressure must be greater than 120 kPa.

So the answer is "The original pressure must be more than 120kPa because when P increases, V decreases".

1. Scientist named the new pigment YInMn because it contains yttrium, indium and manganese elements. The symbol for yttrium is Y, indium is In and that for manganese is Mn thus, to reflect the chemical composition of pigment it is named YInMn.

2. The pigment that is used in coloring materials like paint and plastics was discovered accidently by scientists in an experiment due to mixing and heating of chemicals while manufacturing electronics. An intense blue colored compound results due to chemical combination of two or more elements.

3. No, pigments with same color do not have all the same properties. YInMn blue and cobalt blue, both are same in color, but they have different manufacturing process and YInMn is more durable than cobalt because it gets fade over time.

4. The two characteristics of YInMn are good pigment and use of nontoxic ingredients in manufacturing. It is difficult to find the blue pigments in nature, it is also difficult to manufacture them therefore, the mentioned characteristics are important.

Answer:

Fragmentation

Explanation:

APEX

yeah weight is the answer

The correct answer is option D, 0.009M

Concentration is defined as the amount of solute in a solution.

Noting the following points about concentration is helpful;

A high numerical value of concentration indicates that there is a higher amount of solute in the solution while a lower value of concentration indicates that there is a lesser amount of solute in the solution.

Hence, a solution with lesser concentration is said to be dilute. If the solution has a concentration of 0.009M, then it is a dilute solution.

https://brainly.com/question/1416865

Answer:gold

Explanation:

Answer: Option (A) is the correct answer.

Explanation:

When we place two objects of different temperature adjacent to each other then there will occur transfer of heat from hotter object to colder object till their temperature becomes equal.  

This process is known as conduction.

For example, a metal spoon placed in hot coffee cup then heat will flow from coffee to the cup.

Convection is defined as the process in which a fluid (liquid or gas) when heated then more dense (cooler) substance sinks ate the bottom whereas less dense (hotter) substance will rises at the top.  

This intermixing of the substances tends to generate convection currents and this process is known as convection.

Radiation is defined as an electromagnetic energy which travels in space in the form of waves or particles.

This means that heat energy will always travel from a warmer object to a colder object.

Thus, we can conclude that heat ALWAYS flows from warmer objects to cooler objects, is a true statement about heat transfer through conduction, convection, or radiation.

The statement 'heat ALWAYS flows from warmer objects to cooler objects' is TRUE about heat transfer through conduction, convection, or radiation (Option A).

In conclusion, the statement 'heat ALWAYS flows from warmer objects to cooler objects' is TRUE about heat transfer through conduction, convection, or radiation (Option A).

Learn more about heat transfer here:

https://brainly.com/question/12107378