Which of the following are examples of matter? Check all that apply.
A. air
B. light
C. water
D. sound
E. bacteria
F. copper

Glasswares are glass containers and objects. An Erlenmeyer flask is a piece of glassware that is cone-shaped except for a cylinder-shaped opening. Thus, option B is correct.

Erlenmeyer flask has been commonly called titration or conical flask used in the laboratory to titrate the solution in an experiment. It was named after Emil Erlenmeyer, a German chemist. They are used to heat, cool, mix, titrate, and incubate processes.

They have a distinct shape with a round flat bottom and a narrow neck region that allows swirling and mixing of the solution without any spills. Its narrow opening accommodates the filter funnel that can be used for filtration.

Therefore, option B. Erlenmeyer flask (conical flask) is cone-shaped glassware.

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Explanation:

Actually, the diagram showned in the picture gave you some hints.

Moving every one block to the left indicates 10 times the value of the symbol than the previous one.

For instance,

[tex]1\text{ km}=10^1\text{ hm}=10^2\text{ dam}=10^3\text{ m}[/tex]

Take the first question as example, since "k" is 9 blocks from the left of mu (u),

[tex]1 \text{ kg}=10^9 \text{ }\mu\text{g}[/tex]

[tex]\text{So }.000078\text{ kg}=.000078\times10^9 \text{ }\mu\text{g}=7.8\times10^{-5}\times10^9 \text{ }\mu\text{g}=7.8\times 10^4\text{ }\mu\text{g}[/tex]

Similarly,

[tex]1 \text{ cL}=10^{-2} \text{ L}[/tex]

[tex]\text{So }34800\text{ cL}=34800\times10^{-2} \text{ L}=3.4800\times10^{4}\times10^{-2} \text{ L}=3.48\times 10^2\text{ L}[/tex]

[tex]1 \text{ Mm}=10^{3} \text{ km}[/tex]

[tex]\text{So }.0283\text{ Mm}=.0283\times10^{3} \text{ km}=2.83\times10^{-2}\times10^{3} \text{ km}=2.83\times 10^1\text{ km}[/tex]

Answer:

see picture for answer

Explanation:

Answer:

0.0001 Tg 100000 kg

0.001 Tg 1000000 kg

0.01 Tg 10000000 kg

0.02 Tg 20000000 kg

Explanation:

Answer:

Variable data is defined as information and figures used to build control charts. Variable data can be used to create average (X-bar) charts, range charts, and sample standard deviation charts or "S-charts."

Solution: Change in state of matter is a physical change because of the physical condition and appearance changes but not the chemical composition.

Answer:

Convert the rate of 271.7 gallons/min to an equivalent rate of cL/week. Present your answer in scientific notation rounded to the proper number of sig figs.

Explanation:

Answer:

Explanation:

As,

Mixture defines two or more substances that are physically combined with each other and are formed as solutions, suspension, and colloids

Explanation:

Four importances :

1. Solution of tea leaves, water and sugar is used to make tea

2. Solutions of the chemicals are used in labrotary

3. The drinks that we take are also a kind of solution

4. The air is also a solution of different gases

Answer:

0.04543 kg

Explanation:

try weighing a golf ball they are around 45.5 grams

Answer:

I'm sorry, you didn't post the pictures.

Answer:

300

Explanation:

According to the question we are to leave our answer in 3 significant figures. Therefore, we leave our answer as 300.

Answer:  FeO2

Explanation:

 1.116       g  Fe

0.480     g O

We want to compare the NUMBER of Fe and O atoms.  We only have their masses, but since the molar mass of Fe is 5 times that of O, let's multiply the grams of O by 5 to have it "catch up" to the iron in ternms of number of atoms.   If the molar masses were the same, the masses would be in direct proportion to the formula.  Since they aren't, multiply by the molar mass ratio:

(1.116 grams Fe) x 1 = 1.116 g Fe

(0.480 g O) x 5 = 2.40 g O  [Changes the O mass into a number that correlates with the number of atoms relative to iron],

If the molar masses were the same, this would be the ratio of O to Fe atoms in the compound.  Normalize to the Fe number by dividing both by 1.116:

Fe = 1

O = 2.15

Not perfect, but an empiricle formula of FeO2 makes sense.  I don't see enough information here to prove that this is also the molecular formula, but FeO2 is a valid compound.  Fe(IV)O2,

1. The empirical formula of the compound is Fe₂O₃

2. The molecular formula of the compound is Fe₂O₃

1. Determination of the empirical formula of the compound.

Fe = 1.116 g

O = 0.480 g

Divide by their molar mass

Fe = 1.116 / 56 = 0.02

O = 0.480 / 16 = 0.03

Divide by the smallest

Fe = 0.02 / 0.02 = 1

O = 0.03 / 0.02 = 1.5

Multiply by 2 to express in whole number

Fe = 1 × 2 = 2

O = 1.5 × 2 = 3

Therefore, the empirical formula of the compound is Fe₂O₃

2. Determination of the molecular formula of the compound.

Empirical formula = Fe₂O₃

Molar mass = 5 × molar mass of O₂ = 5 × 32 = 160 g/mol

Molecular formula = empirical × n = molar mass

[Fe₂O₃]n = 160

[(2×56) + (3×16]n = 160

[112 + 48]n = 160

160n = 160

Divide both side by 160

n = 160 / 160

n = 1

Molecular formula = [Fe₂O₃]n

Molecular formula = [Fe₂O₃] × 1

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Answer:

b

Explanation:

because I had that on my homework and got it correct

b

Explanation:

because I had that on my homework and got it correct

Hydrogen: 1

Helium: 2

Lithium: 2•1

Beryllium:2•2

Boron: 2•3

Carbon: 2•4

Nitrogen:2•5

Oxygen:2•6

Fluorine: 2•7

Neon:2•8

Sodium: 2•8•1

Magnesium: 2•8•2

Aluminium: 2•8•3

Silicon: 2•8•4

Phosphorus: 2•8•5

Sulfur: 2•8•6

Chlorine: 2•8•7

Argon: 2•8•8

Potassium: 2•8•8•1

Calcium: 2•8•8•2

Please give me brainliest, I spent a lot of time doing this

Answer:

This bag has been made from introduced materials, but before foreign fibres were used dilly bags were made from bark, leaves, stems, roots, human hair, animal fur and animal sinew.

Answer:

I cant give a  100% answer but it will give a black color  when low starch

Explanation:

Iodine test is used to determine the presence of starch in food items. If iodine is added to any food item and it causes the food item to turn to a blue-black color

mark brainiest please

The energy required is Ionization energy

Answer:you observe the light?

Explanation:

Answer:

Explanation:

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Answer:

A: Cellulose

Explanation:

Cellulose in paper and tree

Answer:

Ammonia

Explanation:

I believe that ammonia is the correct answer to this question.

Answer:

Z was smaller than X

Explanation:

if X<Y and Y<Z

therefore X<Z

independent and dependent variables.

1)

Now it's time to state your hypothesis. ...

2) The hypothesis is often written using the words "IF" and "THEN." For example, "If I do not study, then I will fail the test." The "if' and "then" statements reflect your independent and dependent variables.

Answer:

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. ... The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom.

Answer:

Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon atoms); the number of protons in an atom is called the atomic number.

Explanation:

Explanation:

what you have to do is to multiply the given grams with the ratio of grams of that certain element in it's full compound in order to isolate the compound and get the element.

because the question did not specify how many grams of NO2 is formed, we can assume that the mass is neglegible, thus 1 mole was assigned to Nitrogen.

Now lets she s-subshell structure .

Take an element Berylium

[tex]\huge{\overset{1s^2}{\boxed{\uparrow\downarrow}}\overset{2s^2}{\boxed{\uparrow\downarrow}}}[/tex]

You can see the S-orbital has only space for 2electrons .

Come to p-orbital

Take an element Neon

[tex]\huge{\overset{1s^2}{\boxed{\uparrow\downarrow}}\overset{2s^2}{\boxed{\uparrow\downarrow}}\overset{2p^6}{\boxed{\uparrow\downarrow}\boxed{\uparrow\downarrow}\boxed{\uparrow\downarrow} }}[/tex]

The 2 means its L shell .

It has 8 electrons only and full filled .

The given sample of 10 grams shows the mass of the following compounds.

(LiCl, LiBr, LiF, LiI).

To arrange them in hierarchical order from the least to the greatest, we need to determine their respective number of moles because it is directly proportional to their atomicity.

By using the formula:

[tex]\mathbf{Number \ of \ moles = \dfrac{mass}{ molar \ mass}}[/tex]

For LiCl, its molar mass = (42.39) g/mol

[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{42.39 \ g/mol}}[/tex]

number of mole for LiCl =  0.2359 moles

For LiBr, its molar mass = (86.85) g/mol

[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{86.85 \ g/mol}}[/tex]

number of mole for LiBr =  0.1151 moles

For LiF, its molar mass = (25.94) g/mol

[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{25.94 \ g/mol}}[/tex]

number of mole for LiF = 0.3855 moles

For LiI, its molar mass = (133.85) g/mol

[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{133.85 \ g/mol}}[/tex]

number of mole for LiI = 0.0747 moles

Therefore, we can conclude that the samples in hierarchical order from the least to the greatest is as follows:

LiI < LiBr < LiCl < LiF

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