e the letters of the correct answers on the lines at left.
1.
it kinds of mixtures at school. While
lan has been learning about different kinds of mixtures at so
he was helping prepare dinner for his family, he noticed that some o
the food they were making were different kinds of mixtures. What kind
of mixture was their dinner if they were having spaghetti and meatballs
A. heterogeneous
B. homogeneous
C. solute
D. suspension

Answer:

FLVS

Boron has three valence electrons.

Explanation:

I put the one and it was incorrect.

Answer:

Boron has 3 valence electrons

Explanation:

Answer:

They represented rate of chemical reactions are the rate of change in concentration of products or reactants in a reaction

Answer:

Rate of a chemical reaction = change in concentration of a reactant or product per unit time.

It can be expressed in two terms:

1) The rate of decrease in concentration of any of the reactants.

2) The rate of increase in the concentration of any of the products.

Explanation:

Rate of reaction is the speed at which reactants are converted into products or the rate at which products are produced from reactants.

Answer:

Option B. 25 kPa

Explanation:

First, let us calculate the number of mole of CO2 in the container. This is illustrated below:

Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol

Mass of CO2 = 0.22g

Number of mole of CO2 = 0.22/44 = 0.005mol

From the question, we obtained the following data:

V = 0.5L

T = 305K

R = 0.082atm.L/K /mol

n = 0.005mol

P =?

PV = nRT

P = nRT/V

P = (0.005x0.082x305)/0.5

P = 0.2501atm

Recall:

1atm = 101325Pa

0.2501atm = 0.2501 x 101325 = 25341.4Pa = 25341.4/ 1000 = 25KPa

Answer:

12.89 moles

Explanation:

Before we solve the question, we have to balance the equation of the reaction first. The balanced reaction will be:

2 NO + 2 H2→ N2 + 2 H2O

There are 180.5g of N2 produced, the number of produced in moles will be: 180.5g / (28g/mol)= 6.446 moles

The coefficient of H2 is two and the coefficient of N2 is one. Mean that we need two moles of H2 for every one mole of N2 produced. The number of H2 reacted will be: 2/1 * 6.446 moles = 12.89 moles

This response uses the concept of a mole and the principles of molar mass to calculate the number of atoms in various substances as well as the corresponding molar masses for different elements.

To solve these problems, we need to understand the concept of a mole. A mole is a quantity in chemistry that helps us count entities at the atomic and molecular scale. One mole equals Avogadro's number (6.02214076 x 10^23 entities).

Also, one mole of any element in grams is equal to its molar mass (usually found under the symbol in the periodic table).

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Answer:

The molarity is 0,4M

Explanation:

The molartity is moles of compound (in this case KCl) in 1 liter of solution :

2 L----------0,8 moles KCl

1 L-----------x= (1L x0,8 moles KCl)/2L= 0,4 moles KCl--> 0,4M

Answer:

The number of moles of oxygen gas comes out to be 0.0548 mole

Explanation:

Given volume of gas = V = 3.0 L

The mixture contains 30 % oxygen gas by mole.

Pressure of mixture of gas =  P = 2.0 atm

Temperature = T = 400 K

Assuming n be the total number of moles of the mixture of gas.

The ideal gas equation is shown below

[tex]\textrm{PV} = \textrm{nRT} \\2.0 \textrm{ atm}\times 3.0\textrm{ L} = n \times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1} \times 400 \textrm{ K} \\n = 0.18270 \textrm{ mole}[/tex]

The mixture contains 30% oxygen gas by mole

[tex]\textrm{ Number of moles of oxygen gas} = \displaystyle \frac{30\times 0.18270 \textrm{ mole}}{100} = 0.0548 \textrm{ mole}[/tex]

Number of moles of oxygen gas is 0.0548 mole

Final answer:

At 2.0 atm and 400 K, there are 0.9 moles of oxygen in the 3.0-L gas mixture that contains 30.% oxygen and 70.% nitrogen, as determined using the ideal gas law.

Explanation:

To calculate the number of moles of oxygen, we first need to find the total number of moles in the mixture using the ideal gas law:

n = PV / RT

where n is the number of moles, P is the pressure in atmospheres, V is the volume in liters, R is the ideal gas constant (8.31 J/mol·K), and T is the temperature in kelvins.

Substituting our values into this equation, we get:

n = (2.0 atm)(3.0 L) / (8.31 J/mol·K)(400 K) = 0.069 moles total

we need to find the fraction of moles that is oxygen:

x = (mass of oxygen) / (total mass) = (30.%)(0.069 moles total) = 0.021 moles oxygen

we can use this fraction to find the number of moles of oxygen:

n(O₂) = x(n total) = (0.021 moles oxygen) / (total moles) = (0.9 moles oxygen) / (total moles) = 0.9 moles oxygen

Answer:

The density of the substance is 2.357 g/mL

Explanation:

Given that the substance has a mass of 165 g and occupies a volume of 70 mL, I'm assuming that the question missing is: What is its density?

Density (ρ) is computed as follows:

ρ = mass/volume

ρ = 165 g/ 70 mL

ρ = 2.357 g/mL

Residual soil and transported  soil differ by as follows:

Residual soil stays over its parent rock and transported soil forms from particles from another place.

Explanation:

Soil forms from weathering of rock. When a rocks get weathered it creates small paiticles. That forms different kind of soil. Soil varies in texture, structure, colour, composition and in pH level. Each and every soil type produced from parent rock. Depending upon the character of parent rock soil type is determined like basalt the igneous rock forms black soil.

Residual soil stays over parent rock it does not get off by the activities of natural agents like air, water, wind and glacier. Transported soil comes from hilly area to flat topped ground by transportation through some transporting agents of nature. It is immature soil.

Answer:

If the attractive forces in a substance is much less than the

molecular motion, then the substance will be in a "Gaseous" state.

Explanation:

When decreasing the attractive forces in a substance and making it "much" less than the molecular motion in the substance, the substance should be in a gaseous state.

When the average kinetic energy of a substance or object is small enough that the attractive forces is stable enough to hold all of the particles close together, the molecules in liquids and solids do not move apart.

If the average kinetic energy of a substance or object is great enough (greater than the attractive forces) to overpower the attractive forces between them, the molecules are able to move apart. This would mean that the substance is in a gaseous state.

Overall, if the attractive forces are less than the molecular motion then the molecular motion will over power the attractive forces, breaking the molecules apart and letting them move freely as molecules in a gaseous substance would.

If  the  forces of attraction are less than the molecular motion , then substance will be in gaseous state.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

Learn more about forces of attraction,here:

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Answer:

Explanation:

Sodium chromate has the chemical formula Na2CrO4, and a molar mass of 161.97 g/mol. It is a salt made of two sodium cations (Na+) and the chromate anion (CrO4-) in which the chromium atom is attached to four oxygen atoms.

Answer:

0.635 grams

Explanation:  

Equation for the reaction

[tex]Cu + 2 AgNO_3 -----> Ag^{2+} + CuNO_3[/tex]

mass of Cu = 5.00 g

molar mass = 63.5 g/mol

number of moles = [tex]\frac{mass}{molar mss}[/tex]

number of moles of Cu = [tex]\frac{5.00g}{63.5g/mol}[/tex]

number of moles of Cu = 0.0787 moles

To determine the moles of Ag formed; we have:

0.00588 moles of AgNO₃ × [tex]\frac{2 moles of Ag}{2 moles of AgNO_3}[/tex]

= 0.00588 moles of Ag are  produced

Molar mass of Ag = 108 g/mol

Then mass of Ag that will be produced = number of moles of Ag × molar mass of Ag

= 0.00588 moles × 108 g/mol

= 0.635 grams of Ag are produced.

Answer:

0.635 g of Ag

Explanation:

Below are attachments containing the solution

Answer:

An unsaturated solution can dissolve more solute at the given temperature. If you add more solute until the solution will dissolve no more at that temperature, it is saturated solution.

Explanation:

In unsaturated solution, there is capacity of solution to dissolve more solute inside the solution. In saturated solution, there is no capacity of a solution to dissolve any further solute at a given temperature. This capacity is increased by heating the solution so more solute will be dissolved. This is called supersaturated solution.

Answer:

Wavelength is 10m

Explanation:

To solve this problem, we use the formula for wavelength

Wavelength = wave velocity / frequency

Wavelength = 50m/s / 5Hz

= 10m

Answer:

10 m

Explanation:

Answer:

1.395J/g°C

Explanation:

The following were obtained from the question:

Q = 6527J

M = 312g

ΔT = 15°C

C =?

Q = MCΔT

C = Q/MΔT

C = 6527/(312 x 15)

C = 1.395J/g°C

The specific heat capacity of the substance is 1.395J/g°C

The specific heat of the substance is 1.385 J/g·°C. To identify the substance, compare its specific heat with substances listed in Table 5.1.

The specific heat can be calculated using the formula:

specific heat = energy / (mass x temperature change)

In this case, the energy is given as 6527 J, the mass is 312 g, and the temperature change is 15 degrees Celsius. Plugging in these values, we get:

specific heat = 6527 J / (312 g x 15 °C) = 1.385 J/g·°C

The specific heat of the substance is 1.385 J/g·°C.

To identify the substance, we would need to compare its specific heat with substances listed in Table 5.1.

Answer:

The number of mole is 2.422 moles

Explanation:

To calculate the number of mole, we have to use the formula n = m /Mm

n - moles

m - mass

Mm - molar mass

Let's calculate the molar mass of the compound SiO2

Si - 28.0855

O - 15.999

Note: there are two atoms of oxygen in the compound

Mm of SiO2= 28.0855+ 2* 15.999

= 60.0835g/mol

Now, we calculate the number of moles

n = 145.54g/ 60.0835g/mol

= 2.422mol

I believe it would be the last one. It just amplified the acid, which is (2. Al)(2.Cl3)-> Al2Cl6

Hope it helps!

A neutralization reaction, such as between hydrochloric acid and sodium hydroxide, is not considered a Lewis acid-base reaction as it does not involve the transfer of electron pairs.

A Lewis acid-base reaction refers to a reaction involving the transfer of an electron pair. The Lewis acid accepts the electron pair, while the Lewis base donates it. An example that does not fit the definition of a Lewis acid-base reaction would be the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), which produces water (H2O) and salt (NaCl). This reaction does not involve the transfer of electron pairs, and hence, is not a Lewis acid-base reaction.

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The value of "d" is 80°

Explanation:

Cyclic quadrilaterals are the special group of quadrilaterals with all its base lying on the circumference of the circle. In other words, a quadrilateral inscribed in a circle is called a cyclic quadrilateral.

Cyclic quadrilateral are characterised by some special features such as

Using the property 1  

We find that since the quadrilateral is cyclic, opposite pairs must be supplementary

100° +∠D must be equal to 180°  

D=180° -100° =80°

Answer:

b.Beta

Explanation:

mass number remains constant while atomic number has been increased by 1 unit . beta is electron like element where its mass number is 0 and atomic number is -1.

The nuclear radiation being is emitted in the given radioactive decay is beta radiation.

Beta radio decay :

It is the type of radioactive decay in which negative beta particles and are emitted resulting in isobaric nucleus with 1 extra proton.

Characteristics

In the picture atomic number is increased by one but atomic mass remains the same.

Therefore, the nuclear radiation being is emitted in the given radioactive decay is beta radiation.

To know more about beta radiation,

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Answer:

110.76 are the grams I think?

Explanation:

Answer:

324.6g

Explanation:

From this given problem, it is desirable to solve from the known specie to the unknown.

The balanced chemical combination is given as:

          SrBr₂   +     (NH₄)₂CO₃    →     SrCO₃   +    2NH₄Br

Given;

           2.1993 mole of (NH₄)₂CO₃  ;

Unknown:

           Mass of  SrCO₃ produced;

From the balanced equation, we see that;

                1 mole of  (NH₄)₂CO₃ reacted to produce 1 mole of   SrCO₃

                2.1993 mole of (NH₄)₂CO₃ will produce 2.1993 mole of SrCO₃

Mass of SrCO₃ produced = number of moles x molar mass of SrCO₃

Molar mass of SrCO₃ = 87.6 + 12 + 3(16) = 147.6g/mol

Mass of SrCO₃ = 2.1993 x 147.6 = 324.6g

2.1993 moles of (NH4)₂CO₃ reacted will produce approximately 324.74 grams of SrCO₃.

The question asks how many grams of SrCO3 will be produced if 2.1993 moles of (NH4)₂CO₃ are reacted according to the chemical equation:

SrBr₂ + (NH4)₂CO₃ → SrCO₃ + 2 NH₄Br

Firstly, it's essential to note that the balanced chemical equation indicates a 1:1 mole ratio between (NH4)₂CO₃ and SrCO₃. Given this ratio, the moles of (NH4)₂CO₃ reacted will equal the moles of SrCO₃ produced. Hence, 2.1993 moles of (NH4)₂CO₃ will produce 2.1993 moles of SrCO3.

The molar mass of SrCO₃ (strontium carbonate) is approximately 147.63 g/mol. To convert moles of SrCO₃ to grams, multiply the moles by the molar mass:

2.1993 moles of SrCO₃ × 147.63 g/mol = 324.74 grams of SrCO₃

Therefore, 2.1993 moles of (NH4)₂CO₃ reacted will produce approximately 324.74 grams of SrCO₃.

[A] + [B] ⇌ [C] + [D]

MnS ⇌ Mg + S

Ksp = [C][D]

Ksp = (Mn)(S)

2.3*10^-13 = (x)(x)

2.3*10^-13 = x^2

x = 4.8*10^-7

Concentration of sulfide is x.

Today, my son asked "Can I have a book, Mark?" and I burst into tears. 11 years old and he still doesn't know my name is Brian.

Answer:

The empirical formula of glucose is CH2O

Explanation:

The formula for glucose is C6H12O6

To calculate the empirical formula of glucose, we need to know the number of mole of each element present in the compound.

Since the moles have been given in the formula of glucose C6H12O6

There are 6 moles of carbon, 12 moles of hydrogen and 6 moles of oxygen

Since we've known the number of moles already,so we pick the mole with the smallest number and divide through with it

C - 6/6 = 1

H - 12/6 = 2

O - 6/6 = 1

Therefore, the empirical formula of glucose C6H12O6 is CH2O

Answer:

The only one that makes sense IF the model behaves as the Earth is D.

Explanation:

Answer

D. Some parts of the model Earth will have daytime and some will have night.

Explanation:

i got it right~

Answer:

Dipole-Dipole attraction

Explanation:

Dipole-dipole attraction is a type of vander waals forces found in the molecules of sulfur dioxide.

Vander waals forces are weak attractions joining non-polar and polar molecules together. They are of two types:

London dispersion forces which are weak attractions found between non-polar molecules.

Dipole-Dipole attraction are the forces of attraction which exists between polar molecules. Such molecules have permanent dipoles. This implies that the positive pole of one molecule attracts the negative pole of another. This is what happens between the oxygen and sulfur molecules.

8 moles of CaO produced from 4 moles O2.

Explanation:

Balanced chemical equation for the reaction:

2 Ca + O2 --> 2 CaO

Data given:

moles of O2 = 4

Moles of CaO =?

From the reaction it is seen that 1 mole of O2 is used in the reaction to produce 2 moles of CaO

hence, 4 moles of O2 will give x moles of CaO

[tex]\frac{2}{1}[/tex] = [tex]\frac{x}{4}[/tex]

x =8

So, 8 moles of CaO will be produced when 4 moles of O2 will be used in the reaction. Since oxygen is the limiting reagent in the reaction.

Answer: Metal

Explanation: Potassium is a soft, silvery-white metal, member of the alkali group of the periodic chart. Potassium is silvery when first cut but it oxidizes rapidly in air and tarnishes within minutes, so it is generally stored under oil or grease.

Potassium is a metal, specifically an alkali metal, identified as part of Group 1 on the periodic table. Metals are characterized as shiny, malleable, ductile, and excellent conductors of heat and electricity.

Potassium, denoted by the symbol 'K' on the periodic table, falls into the category of metals. As part of Group 1, it is an alkali metal. Metals are characterized by their shininess, silvery color (in most cases), excellent conductivity of heat and electricity, malleability, and ductility. To classify an element as a metal, nonmetal or metalloid, it's important to examine its location on the periodic table. Generally, metals occupy the left three-fourths of the periodic table while nonmetals are clustered in the upper right-hand corner. Metalloids, or semimetals, have intermediate properties and lie adjacent to the line dividing metals and nonmetals on the right-hand portion of the periodic table.

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Answer: 1008 metres

Explanation:

speed of swimmer = 2.8 m/s

Time taken = 6minutes

(since speed is in metres per second, convert time in minutes to seconds

If 1 minute = 60 seconds

6 minute = 6 x 60 = 360 seconds

distance = ?

Since, speed is the distance covered divided by time taken in seconds, thus

Speed = distance / time

Distance = speed x time taken

distance = 2.8m/s x 360

= 1008 metres

Thus, the swimmer cover a distance of 1008 metres

Answer:

32.5 moles of oxygen are required.

Explanation:

Given data:

Number of moles of C₄H₁₀ = 5.00 mol

Number of moles of oxygen required = ?

Chemical equation:

2C₄H₁₀ + 13O₂   →  8CO₂ + 10H₂O

Now we will compare the moles of oxygen with C₄H₁₀ through balanced chemical equation.

                                        C₄H₁₀            :            O₂

                                            2               :              13

                                          5.00           :           13/2×5 = 32.5

So when 5 moles of C₄H₁₀ are present 32.5 moles of oxygen are required to react completely.

Answer:

32.5

Explanation: