is a toothpick a good model for showing the strength and brittleness of salt ?

Answer:

Cognitive map

Explanation:

A cognitive map is a mental representation of one's physical environment.

Cognitive Map

Explanation:

As an organism begins to learn more and more about its environment, it will begin to construct a complex mental representation of that data called a Cognitive Map

pluses and negatives

D) because it has negative and positive signs

Answer:

D. This D one model best illustrates Thomson explanation of atom

Explanation:

Answer:

The actual value = 25.7 ml

The error = 15.6%

This means that the value of error = 0.156 * 25.7 = 4.0092 ml

Now, the error percentage found means that the student got the value either greater than the actual one with the value of error or less than the actual one with the value of error.

This means that the two possible readings are:

either : 25.7 + 4.0092  = 29.7092 ml

or : 25.7 - 4.0092  = 21.6908 ml

Explanation:

Answer:

Freezing

Explanation:

Freezing is the process in which a liquid changes to a solid. It occurs when a liquid cools to a point at which its particles no longer have enough energy to overcome the force of attraction between them. The freezing point of a substance is the temperature at which it freezes. The freezing point of pure water is 0°C.

Answer:

freezing

Explanation:

Once it gets cold enough (around 32 degrees Fahrenheit), the expanding water molecules begin to form ice crystals. This spreading-out of water molecules as it freezes is why sometimes a bottle full of water will break when you freeze it. The fact that water expands when frozen is also really important to life on Earth.

Answer:

Molecule that contains at least one unpaired electron is called a radical.

Answer:

In chemistry, a radical is an atom, molecule, or ion that has an unpaired valence electron. With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most organic radicals have short lifetimes.

Answer:

Explanation:

Density of a substance can be found by using the formula

[tex]Density(\rho) = \frac{mass}{volume} [/tex]

From the question we are finding the amount of space the gas will occupy that's the volume of the gas

Making volume the subject we have

[tex]volume = \frac{mass}{Density} [/tex]

From the question

mass = 23.8 g/mL

Density = 0.68 g/mL

Substitute the values into the above formula and solve

That's

[tex]volume = \frac{23.8}{0.68} [/tex]

We have the final answer as

Hope this helps you

air pollution  would cause trees to die and animals to die . It would coaus most harm by killing everything on land and in the sea beacuse the animals that die might wash away in the ocean killing other animals  slowly but surely. and it doesnt help  there is soil erosion sooner rather that later it will turn into nothing.

Explanation:

Answer:

A. 3

B . 2

C. 2

D. 2

E. 4 significant figures

Answer:

ur dumb

Explanation:

Answer:

5/3 or 1 2/3 atmospheres.

Explanation:

If the temperature is kept constant then P*V will be constant.

The standard pressure is 1 Atm. so:

250 * 1 = 150 * V

V = 250 / 150

= 5/3 Atm.

The new pressure of gas  is 126.66 mm Hg  at constant temperature according to Boyle's law.

Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.

Mathematically, it can be stated as,

P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.

According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,

P₁V₁=P₂V₂

∴P₂=760×250/150=126.66 mm Hg

Therefore, the final pressure  of the gas is 126.66 mm Hg.

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Answer:

nahco3

Explanation:

Explanation:

1. Particles in the gaseous form can move freely because it is widely spread out.

2. Particles in solid are the tightly packed

Answer:

Welder’s hammer

Explanation:

Welders hammer is a type of hammer which has two parts in which one is a flat surface and the other is slightly pointed.

It is used in the removal of different types of splatters which are often associated with welding works.

It is also used as a tool during the inspection containers in order to determine weld serviceability and the severity of corrosion.

Answer:

Independent variable- nature of irrigation water

Dependent variable- height of the plants

Explanation:

In every study, there must be an independent and a dependent variable. The dependent variable changes its value as the value of the independent variable changes.

When the nature of irrigation water is manipulated, the height of the plant changes accordingly. This implies that the nature of irrigation water (microwaved or tap water) is the independent variable while the height of the plant (the response) is the dependent variable.

Answer: Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element's nucleus. It is the average weight of an element. It is the total number of nucleons in the atom's nucleus.

Assuming there were errors in atomic masses, Mendeleev placed certain elements not in order of increasing atomic mass so that they could fit into the proper groups (similar elements have similar properties) of his periodic table.

- Have a nice day :)

Answer:

F

Explanation:

Helium (He) has 2 protons. Since the number of protons and electrons are the same, it also has 2 electrons. This means that it's first electronic shell is full and the particle is stable. There is no bonding between these atoms to form molecules.

Nitrogen (N) has 7 protons which is also 7 electrons. After filling the first shell (2), it will still have 5 electrons. The atom will share 3 electrons with another nitrogen atom. This will form 3 covalent bonds.

Oxygen (O) has 8 protons which is also 8 electrons. After filling the first shell (2), it will still have 6 electrons. The atom will share 2 electrons with another oxygen atom. This will form 2 covalent bonds.

Fluorine (F) has 9 protons which is also 9 electrons. After filling the first shell (2), it will still have 7 electrons. The atom will share 1 electron with another fluorine atom. This will form 1 covalent bond aka a single covalent bond.

Answer:

The mass in grams of silver chloride, AgCl produced is 84.37 grams

Explanation:

The chemical equation for the reaction is given as follows;

AgNO₃ + NaCl   →  AgCl + NaNO₃

The mass of silver nitrate, AgNO₃, in the reaction = 100.0 g

Therefore, 1 Mole of AgNO₃ produces 1 mole of AgCl,

The molar mass of silver nitrate, AgNO₃ = 169.87 g/mol

The number of moles of silver nitrate, AgNO₃, in the reaction = 100/169.87 moles

The number of moles of silver nitrate, AgNO₃, in the reaction ≈ 0.59 moles

Since 1 mole of AgNO₃ produces 1 mole of AgCl, 0.59 moles of AgNO₃ produces 0.59 moles of AgCl

The number of moles of silver chloride, AgCl produced = 0.59 moles

The molar mass of silver chloride, AgCl = 143.32 g/mol

Therefore;

The mass of silver chloride, AgCl produced = The number of moles of silver chloride, AgCl produced × The molar mass of silver chloride, AgCl

Which gives;

The mass of silver chloride, AgCl produced = 143.32 g/mol × 0.59 moles = 84.37 g

The mass of silver chloride, AgCl produced = 84.37 g.

The mass of silver chloride produced is 84.37g.

The equation of the reaction is; AgNO3 + NaCl → AgCl + NaNO3

Number of moles of silver nitrate = mass of silver nitrate/Molar mass of silver nitrate

Molar mass of silver nitrate = 170 g/mol

Number of moles of silver nitrate = 100 g/170 g/mol = 0.59 moles

Mass of silver chloride =  0.59 moles × 143 g/mol = 84.37g

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Explanation:

Hey, there!!

The parts are an atom are:

Generally, Protons and Neutrons lies in the centre of an atom. After that the shells made outer are covered by electrons. We keep 2 electrons in 1st shell, 8 electrons in 2nd, 18 electrons in 3rd shell and so on. The positions of neutron and protons are always in the nucleus and electrons are in the orbits or shell.

Hope it helps....

Answer:

The volume in cubic centimeters is 250

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other), the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

So:

[tex]x=\frac{c*b}{a}[/tex]

The direct rule of three is the rule applied in this case where there is a change of units. To perform this conversion of units, you must first know that 1 mL = 1 cubic centimeters. So, if 1 cubic centimeters is 1 mL, how many cubic centimeters equals 250 mL?

[tex]cubic centimeters=\frac{250 mL*1 cubic centimeters }{1 mL}[/tex]

cubic centimeters= 250

The volume in cubic centimeters is 250

Answer: Yttruim: 39 protons, 50 neutrons, 39 electrons

Ruthenium: 44 protons, 57 neutrons, 44 electrons

Answer:

The equivalent weight of M is approximately 31.8 g

The equivalent weight of N is approximately 27.98 g

Explanation:

The given parameters are;

The percentage of the the metal M in in the chloride = 47.25%

Where by the chemical formula for the metal chloride is MClₓ, we have;

47.25% of the mass of MClₓ = Mass of M = W

Therefore, we have;

[tex]\dfrac{0.4725}{W} = \dfrac{1}{W + 35.5 \cdot x}[/tex]

0.4725 × (W +  35.5·x) = W

0.4725·W + 0.4725×35.5×x = W

W - 0.4725·W  = 16.77·x

0.5275·W = 16.77·x

W/x = 16.77/0.5275 = 31.799 = The equivalent weight of M

The equivalent weight of M = 31.799 ≈ 31.8 g

Given that 1 gram of M is displaced by 0.88 gram of N, then the equivalent weight of N that will displace 31.799 = 0.88 × 31.799 ≈ 27.98 g

The equivalent weight of N = 27.98 g.

Answer:

Liquid

Explanation:

Answer:

Oil and vinegar separate because it is a suspension

Explanation:

When you let suspensions sit the particles begin to layer out, in the salad dressing the oil layers out on top of the vinegar. The two layers of oil and vinegar don't actually dissolve in each other. The layer with the lower density (oil) floats on top of the layer with a higher density (vinegar)

Water and vinegar are both hydrophilic and mix, whereas the oil is hydrophobic. Oil and vinegar separate because it is a suspension

Hydrophilic molecule are water-loving polar molecule.

They interact with water or they are dissolved in water or water like polar solvent.

For instance, the phospholipid molecules of the plasma membrane has a hydrophilic phosphate group.

Hydrophobic is a water hating  substance which can not dissolve in water, but other non-polar solvent.

Thus hydrophobic substances are lipophilic in nature  and the hydrophobic solvents are used to  separate water-immiscible substances from water.

The layers of oil and vinegar can not  dissolve with each other. The oil layer has the  lower density floats on top of the layer with a higher density product called vinegar.

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Answer:  

It's a fact

Explanation:

Answer:

True

Explanation:

Step 1: Find molecular formula of sucrose

C₁₂H₂₂O₁₁

Step 2: Convert moles of oxygen present to grams

1 mol O = 16 g O

11 mol O = 176 g O

Step 3: Find molar mass of sucrose

C - 12.01 g/mol

H - 1.01 g/mol

O - 16.00 g/mol

12.01(12) + 22(1.01) + 11(16.00) = 342.34 g/mol C₁₂H₂₂O₁₁

Step 4: Set up dimensional analysis

[tex]1 gC_{12}H_{22}O_{11}(\frac{176 gO}{342.34gC_{12}H_{22}O_{11}} )[/tex]

Step 5: Multiply/Divide and cancel out units

Grams of C₁₂H₂₂O₁₁ and grams of C₁₂H₂₂O₁₁ cancel out.

We are left with grams Oxygen

176/342.34 = 0.514109 grams Oxygen

Answer:

HAHAH imagine using brainly... just be big brain like me and know all this!!

Explanation:

Answer:

Neutralization method.

Explanation:

NaOH +HCl⇒NaCl+H₂O