H2O, OH

H2O, HCN

CN, OH

CN–, H2O

Answer:

C

Explanation:

alkali metals are the Group I elements, which have 1 electron in their valence shells

Answer:

Alkali metals are the elements which have only one valence electron in their outermost or ultimate shell.

Explanation:

Alkaline Earth metals have 2 valence electron in their outermost shell and readily give up their 2 electron to achieve stability.

Rare Earth Metals have 3 valence electron in their outermost shell and they have high magnetic moments and divert range of magnetic structure.

Alkali Earth metals have 1 valence electron.

Transition metals generally have 2 valence electron .

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Answer:

lol where is your questions??

Answer:the snaswer is combined

Explanation:you have to piutg it’s toggle did dcdhcd

Answer:

After conducting the experiment it was clear to see that the green ink used was indeed a mixture as it separated from the rubbing alcohol.

Answer:  At some point in your chemistry education, you may have been introduced to the song “The Elements in which Tom Lehrer does a rapid

fire musical rendition of all the elements' names. Like me, you may even have been offered the opportunity to memorize this song for extra credit. If so, it’s possible that you still remember the names of all the elements, which is an impressive feat—not to mention a fun trick to pull out at parties.

Explanation:

Comparing the data obtained online, the first group is more precise

The reason the above selection is correct is as follows;

Question: Parts of the question appear missing from a similar question online and included here;

First Group:

[tex]\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.77 \ cm&2.60 \ cm&2.80 \ cm&2.65 \ cm&2.75 \ cm&2.65 \ cm& 2.68 \ cm\end{array}\right][/tex]

Second Group

[tex]\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.70 \ cm&2.78 \ cm&2.62 \ cm&2.65 \ cm&2.75 \ cm&2.80 \ cm& 2.60 \ cm\end{array}\right][/tex]

Calculations for the first group:

The average = (2.77 + 2.60 + 2.80 + 2.65 + 2.75 + 2.65 + 2.68)/7 = 2.7

The range = 2.80 - 2.60 = 0.20

The approximate ± range of the average = ±0.2/2 = ±0.1

The precision of the first measurement is 2.7 ± 0.1 cm

Calculations for the second group:

The average = (2.70 + 2.78 + 2.62 + 2.65 + 2.75 + 2.80 + 2.60)/7 = 2.7

The range = 2.80 - 2.60 = 0.20

The approximate ± range from the average = ±0.2/2 = ±0.1

The range of values from the average is approximately ±0.1 cm

The precision of the first measurement is 2.7 ± 0.1 cm

Method to determine precision:

Precision is given by the finding the average deviation and the standard deviation as follows;

[tex]\mathbf{Average \ deviation} = \dfrac{\sum \left | x - \mu \right |}{n}[/tex]

[tex]\mathbf{Standard\ deviation} =\sqrt{\dfrac{\sum \left ( x - \mu \right )^2}{n}}[/tex]

Where;

μ = The mean or average = 2.7

n = The number of items (count) of the data = 7

For the first group, we have;

[tex]\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.07 + 0.1 + 0.1 + 0.05 + 0.05 + 0.05 + 0.02 }{7} = \mathbf{0.062857}[/tex]

The average deviation of the first group = 0.062857

∑(x - μ)² ≈ 0.0328

[tex]\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0328}{7}} \approx \mathbf{0.068452}[/tex]

For the second group, we have;

[tex]\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.0+ 0.08 + 0.08 + 0.05 + 0.05 + 0.1 + 0.1 }{7} = \mathbf{0.06571428571}[/tex]

∑(x - μ)² ≈ 0.0378

[tex]\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0378}{7}} \approx \mathbf{0.073485}[/tex]

By using the average deviation, and standard deviation values, the deviation of the second group is more than the first group and therefore the first group is more precise

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Answer:

This process is know as Chromotography

Explanation:

Solid Lead II carbonate can not conduct electricity because it is insoluble in water.

First of all, we must establish the fact that ionic solids conduct electricity in solution because they can be broken up into ions in solution.

In the solid state, they do not conduct electricity because the ions are strongly bound by electrostatic forces.

However, if an ionic substance is insoluble in water, its ions are not available to conduct electricity since ions are the charge carrier in solution. As a result of this, such a substance will not conduct electricity.

Since Lead II carbonate is insoluble in water, its ions are not available hence the substance does not conduct electricity.

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Answer:

cd

Explanation:

image is formed due to reflected light rays and it is enlarged because image distance/ object distance = height of image/height of object

v>u so image is enlarged

Answer:

Loading...

Explanation:

Answer:

This is animal shell

Explanation:

Because it shape and size is in circular shape of body so we can find the types

Answer:

Freezing water and cracking limestone are physical changes.

Answer:

Photoelectric, Threshold

Explanation:

Your welcome

Answer:

It's B. The molecules in the system have more kinetic energy than a solid.

Answer:

V = 1.154 L

Explanation:

1. convert 1.00 kg to grams = 1,000 grams

2. use density formula d = m/v to find volume

v = m/d = 1,000 g   = 1,154.73 ml

            0.866 g/mL

convert to liters, divide by 1000 ml

V = 1.154 L

Explanation:

The main difference between Mendeleev and Modern period table is that Mendeleev's periodic table orders the elements based on their atomic mass whereas Modern periodic table orders the elements based on their atomic number.

Mendeleev's periodic law states that the physical and chemical properties of the elements are a periodic function of their atomic weights while Modern periodic law states that physical and chemical properties of elements are a periodic function of their numbers.

Answer:

B

Explanation:

Protons have a positive charge while neutrons have no charge because they are neutral.

Answer:

b

Explanation:

b/ce protons have+ charge while neutrons have no charge

Answer:

20 m/s

Explanation:

solution,

initial velocity (u)=0 m/s

Distance covered(s)=100m

Time taken(t)=10 seconds

Acceleration (a)=2m/s²

Now,

By using first equation of motion, we have

v=u+at

=0+2×10

=20 m/s

I hope it helped U

stay safe stay happy

Answer:

The dyes which cover more surface area will travel more slowly. Similarly if two substances which have same speeds, they are going to travel together and they won't separate as chromatography separates substances having different rates or speeds for travelling

Chromatography cannot separate components with the same speed due to their identical affinities.

In chromatography, separation relies on differences in affinity between the components and the stationary phase. When components have the same speed, it indicates that their interactions with the stationary phase are nearly identical.

As a result, the forces that cause one component to move ahead of the other are not pronounced enough to achieve effective separation. Without distinct interactions, chromatography struggles to discriminate between components leading to poor separation outcomes.

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#SPJ3

Answer:

0 degrees Celcius and 32 degrees fahrenheit

Explanation:

Answer:

"The polar regions have long winters and short, cool summers."

Explanation:

Climate is the average of that weather. The climate record also includes extreme values such as record high temperatures or record amounts of rainfall.

For Climate example:

You can expect snow in the Northeast in January or for it to be hot and humid in the Southeast in July.

Answer:

C. Amount of 3 dimensional space the object occupies

Explanation:

Single dimension is a laminar

Amount of 2 dimension is area

Amount of 4 dimension is negligible

[tex].[/tex]

Answer C. Amount of 3 dimensional space the object occupies 

Explanation:

 Single dimension is a laminarAmount of 2 dimension is areaAmount of 4 dimension is negligible

Answer:

The excretory system removes waste from the body. remove waste from the blood. The digestive system breaks down the food you eat into nutrients that provide energy and building materials for cells. The digestive and excretory sytems work together to process the food that you eat.

Answer:

Copper(II) sulfate is the chemical compound with the formula CuSO4. This salt exists as a series of compounds that differ in their degree of hydration. The anhydrous form is a pale green or gray-white powder, whereas the pentahydrate (CuSO4·5H2O), the most commonly encountered salt, is bright blue.

Explanation:

Answer:

Explanation:

Answer: B, the gas is being squeezed out of the liquid.

Explanation: The gas does not want to be trapped inside of the liquid, so it is trying to force it’s way out. Therefore creating more pressure in the container or whatever the liquid is being held in.

Answer: more gas dissolves into the liquid

Explanation: just got it wrong thats the right answer

The change from graphite to diamond is a chemical change.

A chemical change involves the rearrangement of atoms in a substance. In other words, the "composition" of the substance changes when a chemical change takes place.

This is clearly seen when graphite changes to diamond. The arrangement of carbon atoms changes as reflected by the change in the density of graphite when it is converted to diamond.

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Explanation:

When one atom supplies both electrons in forming a two-electron bond, it is known as a dative covalent or coordinate bond. ... In this case, the nitrogen atom has a lone pair of electrons that coordinates to the hydrogen cation, which has zero electrons, forming a covalent bond.

Answer:

I think it's lead (pb). Hope this helps.

Answer:

lead

Explanation:

Explanation:

idea= hypothesis

xperience in nature= read Darwin's theory..

with birds from Galapagos island or rain forest environment., had proven that the shape of a bird's beaks, determined what their diet consisted of In the wild.

captured birds from such countries, has proven, an omnivore or seed eater...through testing plus dissection.

The control group are the students who eat no breakfast. The independent variable is the consumption of breakfast. The dependent variable is the performance of students in school.

In an experiment, the control group is the group that did not receive the treatment. The treatment in this case is the consumption of breakfast. Hence the group that did not consume breakfast is the control group.

The independent variable is the variable that is being manipulated and its effect evaluated. The manipulated variable here is consumption of food.

The dependent variable is the variable that is being measured. In this case, it is the performance of students at school.

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