Do all metals have more electrons than protons

PbF2, BaF2 and CaF2

due to the fact that lead has a higher value of solubility product,

lead fluoride will precipitate first

Answer:

S02

Explanation:

Based on it

it cause the base when dissolving in water

The strength of force that you use to move a tennis ball a short distance is option d: weak .

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Therefore, The word "force" has a specific meaning in science. At this level, calling a force a push or a pull is entirely appropriate. A force is not something an object "has in it" or that it "contains."

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Q.

What strength of force do you use to move a tennis ball a short distance?

answer choices

large

medium

strong

weak

Answer:

Therefore, the pressure exerted by the hydrogen gas that was trapped over water is 108.8 kPa

Explanation:

The law of partial pressure by Dalton, in a mixture of gases which do not react chemically together, the total pressure is equal to the sum of the partial pressures of the individual gases.

According to this law, the total pressure exerted by the gases above the displaced water is equal to the sum of the partial pressure of water vapor and the partial pressure of hydrogen gas: Ptotal = pH₂ + pH₂O

Therefore, pH₂ = Ptotal - pH₂O

Vapor pressure of water at 37°C = 3.17 kPa; Ptotal = 102.0 kPa

pH₂ = (102.0 - 3.17) kPa

pH₂ = 98.8 kPa

Therefore, the pressure exerted by the hydrogen gas that was trapped over water is 108.8 kPa

The statement "an atom contains all the other levels of biological organization" is false.

It is known that, all those other biological organization tiers are present in the biosphere. None of the three are living, unlike a nucleus, despite being underneath the cell's surface.

Organelles, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystems, and biosphere have become the biological stages of the structure of living things, listed from the lowest to the most complex.

There are 13 organizational levels. Atoms, molecules, organelles, cells, tissues, organs, organ systems, creatures, populations, communities, ecosystems, biomes, and biosphere are still the sequential representations of these elements. Atom: The simplest and also most fundamental building block of matter.

Cells are the smallest unit of organization for just a living entity. Since cells are the tiniest units of life, they are where all of an organism's biochemical activity takes place that's why given statement will be false.

Therefore, the atom contains all the other levels of biological organization. is false statement.

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Answer: Diploid Cells (?)

Explanation:

Answer:

it's volume also decrease

Answer:

diagram C best represents the mixture

The balanced chemical equation is:

0.5C7H16 + O2 → 0.5CO2 + H2O

For balancing the chemical equation C7H16 + O2 → CO2 + H2O, we can use linear algebraic techniques. We need to determine the coefficients that balance the number of atoms on both sides of the equation.

Let's denote the coefficients for C7H16, O2, CO2, and H2O as a, b, c, and d, respectively.

The balanced chemical equation can be written as:

aC7H16 + bO2 → cCO2 + dH2O

To balance the carbon (C) atoms, we have:

7a = c (Equation 1)

To balance the hydrogen (H) atoms, we have:

16a = 2d (Equation 2)

To balance the oxygen (O) atoms, we have:

2b = 2c + d (Equation 3)

We have three equations (Equations 1, 2, and 3) and four unknowns (a, b, c, d). To solve this system of equations, we can write it in matrix form and find the solution using linear algebraic techniques.

The augmented matrix for the system of equations is:

[ 7 0 -1 0 | 0 ]

[ 0 0 0 -2 | 0 ]

[ 0 -2 2 -1 | 0 ]

By performing row operations to row-reduce the augmented matrix, we can obtain the solution:

[ 1 0 -0.5 0 ]

[ 0 1 -1 -0.5 ]

[ 0 0 0 0 ]

The solution to the system of equations is:

a = 0.5

b = 1

c = 0.5

d = 1

Putting the values of a,b,c, and d we get the balanced chemical equation as:

0.5C7H16 + O2 → 0.5CO2 + H2O

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Moles are the unit of measurement that estimates the amount of the substance in a sample. It directly compares the amounts of substances. Thus, option c is correct.

Moles are said to be the SI unit to estimate the number of substances like atoms, molecules, ions, etc., in a sample. It is used to measure the elementary entities that are small in size.

It is abbreviated as mol and is equivalent to 6.02214076 × 10²³ particles (Avogadro number). It can be calculated by mass and the molar mass of the substance and is shown as,

Moles (n) = mass ÷ molar mass

Where mass is given in grams and molar mass in grams/ mol.

The moles are used to estimate the molarity and are also used in the ideal gas equation. The moles will be more in the substance with less molar mass and vice versa.

Therefore, option c. moles directly compares the amounts of substances.

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Answer:

oxygen, carbon, hydrogen, nitrogen, and sulfur

Explanation:

By using the molar masses of the products obtained in the reaction, we can calculate that the mass P₄O₆ formed is 125.1 g, and the mass of P₄O₁₀ formed is 162.2 g.

If the phosphorus (P) and oxygen (O₂) react completely, then the total mass of the reactants will be equal to the total mass of the products. So, if we label the mass of P₄O₆ as X, and the mass of P₄O₁₀ as Y, we know that:

X + Y = m(P) + m(O₂)

X + Y = 141.3 g + 146.0 g

X + Y = 287.3 g

X = 287.3 g - Y

Now, all the phosphorus has been used in the oxidation reaction. So, if we wanted to calculate the mass of phosphorus in P₄O₆, we would use its molar mass (M = 220 g/mol):

4 * 31 g : 220 g = mass of P in P₄O₆ : X

mass of P in P₄O₆ = 124 * X / 220

mass of P in P₄O₆ = 0.5636 * X

We can do the same for the mass of phosphorus in P₄O₁₀ (M = 284 g/mol):

4 * 31 g : 284 g = mass of P in P₄O₁₀ : Y

mass of P in P₄O₁₀ = 124 * Y / 284

mass of P in P₄O₁₀ = 0.4366 * Y

We know that the total mass of P used is 141.3 g, so:

mass of P in P₄O₆ + mass of P in P₄O₁₀ = 141.3 g

0.5636 * X + 0.4366 * Y = 141.3 g

If we substitute X from the first set of unknowns, we get:

0.5636 * (287.3 g - Y) + 0.4366 * Y = 141.3 g

161.9 g - 0.5636 * Y + 0.4366 * Y = 141.3 g

20.6 g = 0.127 * Y

Y = 20.6 g / 0.127

Y = 162.2 g

X = 287.3 g - 162.2 g

X = 125.1 g

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Answer:

28.01

Explanation:

this is the molar mass

EDTA (ethylenediaminetetraacetic acid) is commonly used to determine the hardness of water due to its ability to form complexes with metal ions, particularly calcium and magnesium ions.

Water hardness refers to the concentration of calcium and magnesium ions present in water. These ions can cause scaling, reduce the effectiveness of soaps, and have other negative effects. EDTA acts as a chelating agent, meaning it can bind to metal ions and form stable complexes.

In the process of determining water hardness, a known amount of EDTA solution is added to a water sample. The EDTA molecules form complexes with the calcium and magnesium ions present in the water.

The endpoint of the titration is reached when all the metal ions are complexed by the EDTA, resulting in a color change or an indicator reaching a specific endpoint.

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Answer:

The speed of the turtle is 9.41 centimeters per second.

Explanation:

Speed of small turtle = 566 furlong/fortnight

1 furlong = 20,116.8 cm

1 fortnight = 1,209,600 seconds

Speed of small turtle in centimeter per seconds:

The speed of the turtle is 9.41 centimeters per second.

Explanation:

To determine the [H3O+] concentration in each acid solution, we need to use the acid dissociation constant (Ka) equation. For strong acids, the [H3O+] concentration is equal to the acid concentration, but for weak acids, we need to take into account the equilibrium between the acid and its conjugate base.

Ka = [H3O+][A-]/[HA]
[H3O+] = sqrt(Ka*[HA])
If the acid is weak, then the value of [H3O+] is less than the acid concentration because only a small fraction of the acid molecules dissociate into H3O+ ions. The degree of dissociation depends on the Ka value, the acid concentration, and the ionic strength of the solution.
For example, if we have a 0.1 M solution of acetic acid with a Ka of 1.8x10^-5, then:
[H3O+] = sqrt(1.8x10^-5 * 0.1) = 1.34x10^-3 M
Since acetic acid is a weak acid, the [H3O+] concentration is less than the initial acid concentration of 0.1 M. This means that most of the acetic acid molecules remain undissociated in solution.
In summary, to determine the [H3O+] concentration in acid solutions, we need to use the Ka equation and consider the strength of the acid. If the acid is weak, then the [H3O+] concentration will be less than the acid concentration due to incomplete dissociation.

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Answer:

To make H2O, you need two H and one O. in this equation, you are given two Os which is too many. you'll end up with an extra O. H2 + O2 -> H2O + O

To determine the molarity of HNO3, we can use the concept of stoichiometry and the volume and concentration information provided. The balanced chemical equation for the reaction between KOH and HNO3 is: KOH + HNO3 -> KNO3 + H2O

From the given information, we know that 3 mL of 0.115 M KOH is required to reach the equivalence point when titrating 15.0 mL of HNO3.

Using the concept of stoichiometry, we can set up a ratio between the volumes and concentrations of the two solutions:

(Molarity of KOH) x (Volume of KOH) = (Molarity of HNO3) x (Volume of HNO3)

(0.115 M) x (3 mL) = (Molarity of HNO3) x (15.0 mL)

Solving for the molarity of HNO3, we get:

Molarity of HNO3 = (0.115 M) x (3 mL) / (15.0 mL)

Molarity of HNO3 = 0.023 M

Therefore, the molarity of HNO3 is 0.023 M.

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Answer: Describe a Procedure You Should Use to Separate a Mixture of Iron Filings, Water, and Clay.

Explanation:

One possible procedure to separate a mixture of iron filings, water, and clay is as follows:

1. Use a magnet to separate the iron filings from the mixture. Place the magnet near the mixture and move it around until the iron filings are attracted to the magnet. Remove the magnet and the iron filings from the mixture.

2. Pour the remaining mixture through a filter to separate the clay from the water. Place a funnel in a flask and insert a filter paper into the funnel. Pour the mixture through the filter paper. The clay will be left behind on the filter paper, while the water will pass through into the flask.

3. To recover the water, heat the flask on a hot plate or other heat source to evaporate the water. Place the flask on a hot plate and heat it until the water has evaporated. The clay will be left behind in the flask.

4. Once the water has evaporated, the clay can be collected from the flask. Scrape the clay out of the flask and store it in a container.

This procedure separates the iron filings, clay, and water from each other by using physical properties such as magnetism and filtration.

{I Hope This Helps! :)}

Answer:

Yes it does because the atoms/molecules are moving faster than they are in a cold substance.

Explanation:

Answer:

B (ionic bond)

Explanation:

Because it is! :)

A change that affects the physical properties of a substance is called a physical change.

Physical changes occur when a substance undergoes alterations in its state, appearance, or other physical characteristics without changing its chemical composition. Examples of physical changes include state changes (melting, freezing, boiling, and condensing), shape, size, and color.

Physical changes are generally reversible, meaning that the substance can be returned to its original state or form by reversing the conditions that caused the change. For instance, if you melt ice (solid water) into liquid water, you can freeze it back into ice by lowering the temperature. Similarly, when you stretch a rubber band, it will return to its original shape when the stretching force is removed.

It is important to note that physical changes do not create new substances. The chemical identity of the substance remains the same throughout the process. For example, when water evaporates, it changes from a liquid to a gas, but it is still water, just in a different state.

In conclusion, a physical change affects a substance's physical properties, such as state, shape, or size, without altering its chemical composition. These changes are generally reversible and do not result in the formation of new substances.

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Answer:

pretty sure it's false

Explanation:

hope this helps!

Answer:

Explanation:

Answer:

the analysis of the relationships between different physical quantities by identifying their base quantities and units of measure and tracking these dimensions as calculations or comparisons are performed.

Explanation: