Which six elements are generally considered metalloids

Answer:279.1 K

Explanation:

You'll be using Gay-Lussac's Law for this. P1/T1=P2/T2

I have a class for this, and one of the practice questions was formatted this way, so I used that format and substituted said numbers as needed

P1:67 Pa

P2:60 Pa

T1:250 K

T2:?

I really hope this helps!

Answer:

Its complete electron configuration is 1s22s22p63s23p64s23d104p65s24d105p5.

Explanation:

Answer:

its help us

equation- ( a)2+(b)2+2an

Answer:

Constant

Explanation:

Trust

Answer:

The pH of a solution is the negative logarithm of the hydrogen-ion concentration. The pH of pure water or any neutral solution is thus 7.00.

Explanation:

Answer:

hydrogen concentration

Explanation:

Answer:

9.5E22

Explanation:

(1.9/12.011)×6.02E23

density= mass/ volume

d= 20/5

d= 4 g/cm^3

Answer:

11.495  grams

Explanation:

Answer:

1s22s22p63s23p6

Explanation:

The electronic configuration of K is 1s22s22p63s23p64s1.To form K+1 we remove electron. Thus the electrons configuration of K +1 is 1s22s22p63s23p6.

Hence answer is option A

Answer:

false false false false false

Without doing research before doing an experiment you’d be at risk, example: Chemical reactions that COULD cause chemicals burning through human skin, or setting off an harmful explosion by mixing unknown chemicals together.

Answer:

1. B

2. C

3. A

4. C

5. A

6. B

Explanation:

1. Mary discovered that the cell membrane of a bacteria acts like a fence because it keeps some things in and other things out: this is an analogy because there's a comparison between the cell of a bacteria and a fence.

2. Mary walked into her room where her little son was playing, found a broken window, and thought immediately that her son had broken it: this is an inference because she immediately thought her son broke it.

3. Mary noticed that her counter top was warm to the touch: this is an observation which was based on an evidence of touch.

4. Mary noticed that the side walk was wet and thought that it may have been that the sprinklers had been on recently: this is an inference because it was based on her thoughts.

5. Mary counted and recorded 20 heart beats in 10 seconds: this is an observation because she actually counted her heart beats.

6. The lecturer compared the human eye to a camera lens: this is an analogy because it was a comparison between a human eye and a camera lens.

Answer:

an atom. It is the smallest thing known to man kind

Explanation:

Answer:

C

Explanation:

so basically, we can eliminate some answer choices right away.

an atom (answer choice D) is made up of all the other answer choices, so that is the largest (not the answer).

a nucleus (answer choice B) is made up of protons (answer choice A) and neutrons which means it is not the smallest either (not the answer).

now, we are left with a proton and an electron. electrons are much smaller than protons, so they are usually not included in an element's atomic mass. therefore, an electron is the smallest out of these answer choices.

Answer:

glucose molecules that our cells need from is plants

Answer:

Last one

Explanation:

Answer:

Boiling point!

Explanation:

Distilled water is capable of being heated beyond the normal boiling point due to absence of dissolved impurities which provide nucleating points at the normal boiling point.

If you enjoyed my answer, I'd appreicate a Thanks and a rating!

Have a great day!

Answer: Many elements have one or more isotopes that are radioactive. These isotopes are called radioisotopes.

Answer:

Many elements have one or more isotopes that are radioactive. The isotopes are called radioisotopes

Answer:

replace its predecessor, the 30-pin dock connector, the Lightning connector is used to connect Apple mobile devices like iPhones, iPads, and iPods to host computers, external monitors, cameras, USB battery chargers, and other peripherals.

Answer:

Boiling the subtance

Explanation:

To determine the nature of an unknown liquid the first thing you can do is boil it:

* If the sample is water, the boiling point must be near to 100°C

*When all pure water is evaporated, there is no residue, the glass must be empty.

* But if the sample is salt water, when all water is evaporated, you will see a solid white residue that, possibly, is salt.

Answer:

The measurement is precise and accurate

Explanation:

The accuracy of a measurement of length is often indicated by how "precisely" the length measurement can be read depending on the type of measuring instrument used scale.

Looking at the measurement, we can see that the values lie between ±0.1 from the expected values hence it is accurate.

Also, the values differ from each other by ±0.1 hence it the measurements are precise.

Answer:

Accuracy:

5.5 = 98.15%

5.3 = 98.15%

5.4 = 100 %

Precision:

5.5 ± 0.14

5.3 ± 0.14

5.4 ± 0.14

Explanation:

Accuracy is determined using; 100% - % error

% error = absolute error/actual value * 100%

5.5 - 5.4/5.4 * 100% = 1.85%

accuracy = 100 % - 1.85 % = 98.15%

5.3 - 5.4/5.4 * 100 5 = 1.85%

accuracy = 100 % - 1.85 % = 98.15%

5.4 - 5.4/5.4 * 100  % = 0 %

accuracy = 100 % - 0% = 100%

Precision is determined by obtaining the standard deviation of the mean;

s = √{∑(|x - m|)²/(n - 1)}

where x is the value, m is mean of values , n is number of values

mean = (5.5 + 5.3 + 5.4) / 3 = 5.4

deviations from mean, (x - m) are as follows;

|5.5 - 5.4| = 0.1

|5.3 - 5.4| = 0.1

|5.4 - 5.4| = 0

∑(x - m)² = (0.1 + 0.1 + 0) ²= (0.2)² = 0.04

(n - 1) = 3 - 1 = 2

s = √(0.04/2)

s = ± 0.14

Therefore, the precision of each measurement is as follows;

5.5 ± 0.14

5.3 ± 0.14

5.4 ± 0.14

Answer:

Elements in fluids.

Explanation: They're formed from elements crystalizing in fluids (Like water.) For example limestone forms on the bottom of the ocean from calcium.

Answer:

The precipitation of ions in solution

Explanation:

Answer:because some have more radiation than others causing mutations and there for either decreasing or increasing the amount of ions

copper is a acidic metal in general therefor it will most likely erode faster than any other metal making it hard to determan the number of ions in general the metal will have basicly what I’m trying to say is there is no solid answer as many metals can change there ions for no given reason

Explanation:

Answer : The cost of pennies to buy 125 L of gasoline would be, $71.92

Explanation :

As we are given that the cost to buy gasoline is $2.186/gallon.

Now we have to determine the cost to buy 125 L of gasoline.

First we have to convert 125 L into gallon.

Conversion used:

(1 gallon =  128 oz, 1 oz= 29.6 mL, 1 mL = 0.001 L)

As, 1 L = 1000 mL

So, 125 L = 125000 mL

and,

As, 29.6 mL = 1 oz

So, 125000 mL = [tex]\frac{125000mL}{29.6mL}\times 1oz=4222.9oz[/tex]

and,

As, 128 oz = 1 gallon

So, 4222.9 oz = [tex]\frac{4222.9oz}{128oz}\times 1\text{ gallon}=32.9\text{ gallon}[/tex]

Now we have to determine the cost to buy 125 L of gasoline.

As, the cost of 1 gallon of gasoline = $2.186

So, the cost of 32.9 gallon of gasoline = $2.186 × 32.9

                                                                = $71.92

Therefore, the cost of pennies to buy 125 L of gasoline would be, $71.92

Answer:

It has the most quantitative effect on the average atomic mass of the element.

Explanation:

Tungsten's most common isotope will have the most quantitative effect on the average atomic mass.

The most common isotope of tungsten will represent its most abundant isotope.

The isotope with the most geonormal abundance will have the highest effect on the average atomic mass of an element.

Answer:

According to Coulomb, the electric force for charges at rest has the following properties: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. The attraction or repulsion acts along the line between the two charges

Answer:

B When the molecule contains polar bonds.

Explanation:

AP-EXpert

The shape of a molecule affect its polarity, when the molecule contains polar bonds because polarity depends on polar bonds.

The polarization of a molecule greatly depends on the shape of the molecule. The net dipole moment occurs only due to the uneven distribution of electrons between the two atoms.

So we can conclude that the shape of a molecule affect its polarity, when the molecule contains polar bonds because polarity depends on polar bonds.

Learn more about polar here: https://brainly.com/question/545359

#SPJ2

it doesn't repopulate as fast because ecosystem 2 could have more trouble reproducing then ecosystem 1.