please help with the question tagged below

Answer:

false

Explanation:

no, waste products in lab can't be poured down the sink because sometime cimicals can be harmfully and can damage the sink

Answer:

False

Explanation:

Your teacher has a designated area for getting rid of chemicals especially potentially hazardous chemicals

Answer:

1.24

Explanation:

According to the concept of significant figures, rounding off to  3 significant figures gives 1.24.

Significant figures are used for establishment  of a number which is presented in the form of digits. These digits give a meaningful representation  to the numbers.

The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:

1)All non-zero digits are significant .

2)All zeroes which occur between non-zero digits are significant.

3)All zeroes to the left and right of  a non-zero digit are not significant.

4) All zeroes on right  of decimal are significant if a non-zero number follows them.

5)All zeroes on right side of non-zero digit are significant.

Learn more about significant figures,here:

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Answer:

9.32% de riqueza de Al en la muestra

Explanation:

La reacción de aluminio (Al) con ácido sulfúrico (H₂SO₄) es:

2 Al + 3 H₂SO₄ → Al₂(SO₄)₃ + 3 H₂

Dos moles de aluminio reaccionan con 3 moles de ácido sulfúrico para producir una mol de sulfato de aluminio (Sal).

Las moles de 28g de sulfato de aluminio (Masa molar: 324.15g) son:

28g ₓ (1 mol / 324.15) = 0.0864 moles de Al₂(SO₄)₃

Así, las moles de aluminio que reaccionaron fueron:

0.0864 moles de Al₂(SO₄)₃ ₓ ( 2 moles Al / 1 mol Al₂(SO₄)₃) =

0.1728 moles de Al. En gramos (Masa atómica: 26.98g/mol):

0.1728 moles Al ₓ (26.98g / mol) = 4.66g de aluminio.

Así, la riqueza de la muestra es:

4.66g Al / 50g muestra ₓ100 = 9.32% de riqueza de Al en la muestra

Answer:

Hope this helps you

Answer:

Option C. Satellite C.

Explanation:

The gravitational pull of the earth talls about the weight of an object.

To know which of them has the greatest gravitational pull, let us determine the weight of each satellite.

For satellite A:

Mass = 500Kg

Acceleration due to gravity (g) = 9.8m/s²

Weight (W) =.?

Weight (W) = mass (m) x Acceleration due to gravity (g)

W = m x g

W = 500 x 9.8

W = 4900N

For satellite B:

Mass = 400Kg

Acceleration due to gravity (g) = 9.8m/s²

Weight (W) =.?

W = m x g

W = 400 x 9.8

W = 3920N

For satellite C:

Mass = 700Kg

Acceleration due to gravity (g) = 9.8m/s²

Weight (W) =.?

W = m x g

W = 700 x 9.8

W = 6860N

For satellite D:

Mass = 600Kg

Acceleration due to gravity (g) = 9.8m/s²

Weight (W) =.?

W = m x g

W = 600 x 9.8

W = 5880N

Satellite >> Mass >>> Gravitational pull

A >>>>>>>> 500Kg >> 4900N

B >>>>>>>> 400Kg >> 3920N

C >>>>>>>> 700Kg >> 6860N

D >>>>>>>> 600Kg >> 5880N

From the above calculations we can see that satellite C has the greatest gravitational pull.

Answer:

D) HCOOCH2CH3

Explanation:

An isomer of a compound is defined as a chemical substances with the same formula (That is, same atoms) but in different structures.

For propanoic acid, there are 3 atoms of C, 6 atoms of H and 2 atoms of oxygen.

A) CH2CHCOOH . Here you have 3 atoms of C but 4 atoms of H. That means this compound is not an isomer.

B) CH3CH2CH2COOH . Here, there are 4 atoms of C. Thus, is not an isomer.

C) CH3CH(OH)CH2OH. This structure has 3 atoms of C, but 8 atoms of H. Thus, is not an isomer.

D) HCOOCH2CH3. Here, there are 3 atoms of C, 6 atoms of H and 2 atoms of O. Thus, this structure is an isomer of propanoic acid.

Answer:

D) HCOOCH2CH3

Explanation:

Option D is an isomer of propanoic acid because this compound has the same number of atoms as the acid; 3 carbons, 6 hydrogens and 2 oxygen. They may differ in some properties but their main difference must be their molecular structure, that is, the arrangement of their atoms.

Answer:

3. Triple Beam Balance

Explanation:

A triple beam will be most suitable for measuring the mass of a small stone because it is very accurate, and has a reading error of +/- 0.05 gram.

Answer:

6) 225.8 g

7) 1.01 g

8) 21.624 g

Explanation:

6) Molar Mass of Lithium Bromine: 86.845

86.845 * 2.6 = 225.8 g

7) Molar Mass of Neon: 20.180

20.180 * 0.05 = 1.01 g

8) Molar Mass of Water Vapor: 18.02

18.02 * 1.2 = 21.624 g

Answer:

Option B. 176g/mol

Explanation:

We'll begin by writing the chemical formula for hexasodium difluoride. This is given below:

Hexasodium means 6 sodium atom

Difluoride means 2 fluorine atom.

Therefore, the formula for hexasodium difluoride is Na6F2.

The relative formula mass of a compound is obtained by simply adding the atomic masses of the elements present in the compound.

Thus, the relative formula mass of hexasodium difluoride, Na6F2 can be obtained as follow:

Molar mass of Na = 23g/mol

Molar mass of F = 19g/mol

Relative formula mass Na6F2 = (23x6) + (19x2)

= 138 + 38

= 176g/mol

Therefore, the relative formula mass of hexasodium difluoride, Na6F2 is 176g/mol

Answer:

B. 176 g/mol

Explanation:

chemistry ed tell

Explanation:

a)phenotype= 100% big

b) genotype=1:2:1 (FF-25%, Ff-50%, ff-25%)

phenotype=3:1 (big=75%, small= 25%)

Answer:

0.3634 °C

Explanation:

In this question, we are tasked with calculating the freezing point depression of 0.19 M C12H12O11( sucrose)

Mathematically this can be calculated using the formula;

ΔTf = i * kf * m

where ΔTf is the freezing point depression

i is Van’t Hoff factor

kf is the molal freezing point depression for the solvent

m is the molality of the solution

From the question we identify the following;

Since sucrose is a non-electrolyte, i = 1 ( i refers to the number of moles of particles obtained when 1 mol of solute dissolves)

m is 0.19

kf = 1.86

substituting these values into the equation, we have

ΔTf = 1 * 1.86 * 0.19 = 0.3534 °C

Answer:

C. 0.50 mol

Explanation:

Number of mole= mass /molar mass

Mass of KF is given as 29g

The molar mass of KF= 39+19= 58g/mol

No of mole= mass/ molar mass

= 29g/58g/mol

1/2 mol= 0.5 mol

Answer:

C) 0.50 mol

Explanation:

Hello,

In this case, we study this mole-mass relationship by using the molar mass of potassium fluoride (KF) which is 58.1 g/mol to compute the required number of moles in the 29-g sample as shown below:

[tex]n_{KF}=29gKF*\frac{1molKF}{58.1gKF} \\\\n_{KF}=0.50molKF[/tex]

Therefore answer is C) 0.50 mol.

Best regards.

Answer:

A television.

Explanation:

Diodes and Resistors are important components of modern day appliances. They are both made up of electrical components with two-terminals. The resistors provide resistance to the appliance while the diode enables electric current to flow in one direction. This enables proper functioning and prevention of hazards associated with electric current.

Answer:

1. The soap molecule is made up of two different ends that include polar head which is hydrophilic carrying carboxylate group (-CO2) (binds with water) and the other is non-polar hydrocarbon tail that is hydrophobic carrying hydrocarbon chain (binds with stain) .

When soap water is added with stain or oil, soap molecules form micelles which are the tiny clusters of soap molecules representing hydrophilic head  (water-loving) points outwards that sticks to the water and hydrophobic tail (oil-loving) points inwards that stick to the oil and trap oil in the center.

As micelle is soluble in water, the trapped oil or stain is rinsed away along with soapy water.

2. A micelle is defined as a cluster of surfactant molecules that are dispersed water and form a colloidal solution.

3. Emulsification is the process in which soap act as an emulsifier that allows dispersion of immiscible liquid. It means soap will disperse stain or dirt in such a way that it can be removed.

4. As we discussed earlier, Soap has hydrophilic (water-loving) carboxylate group (-CO2) that form hydrogen bonds and ion-dipole interactions with water and the hydrophobic (water-fearing) tail carry nonpolar hydrocarbon chain that interacts with a stain by forming micelles through dispersion force.

The negatively charged carboxylate group (hydrophilic) repels each other and hydrocarbon chain (hydrophobic) trap stain inside and remove the dirt along with water.

Answer:  A.  1,1,1

Explanation:

The coefficients that will balance the equation; NH4OH(aq) →H2O(l) + NH3(g), is 1, 1, 1, because it proves the total number of atoms of each element on the LHS and RHS of the equation are equal, hence balanced.

LHS          RHS

N = 1            1

H = 5          5

O = 1            1

Explanation:

lpg and oxygen are two gases which are supplied in compressed form in homes and hospitals

Answer:

lpg and oxygen

they are the two gases which are supplied in either a gas form or any other medical forms in homes and hospitals to look after the ill patients or family members

Answer:

The concentration of the solution is 5.8168 × [tex]10^{-4}[/tex] mol.[tex]dm^{-3}[/tex]

Explanation:

Here, we want to calculate the concentration of the solution.

The unit of this is mol/dm^3

So the first thing to do here is to calculate the number of moles of the solute present, which is the number of moles of AlCO3

The number of moles = mass/molar mass

molar mass of AlCO3 = 27 + 12 + 3(16)  = 27 + 12 + 48 = 87g/mol

Number of moles = 33.4/87 = 0.384 moles

This 0.384 moles is present in 660 L

x moles will be present in 1 dm^3

Recall 1 dm^3 = 1L

x * 660 = 0.384 * 1

x = 0.384/660 = 0.00058168 = 5.8168 * 10^-4 mol/dm^3

Answer:

The 5 properties are wavelength, amplitude, time-period, frequency and velocity/speed.

Explanation:

Answer:

the correct answer is sound wave can be described by five chacteristics:wavelength, amplitude,time-period, frequency and velocity or speed.

Explanation:

hope this helps !!!!

Answer:

false

Explanation:

the soil contain: organic materials, and inorganic materials

Answer:

H = 1+

O = 2-

O Has 8 protons weight 16g/mole

H has 1 proton weight 1g/mole

H - O - H

Oxygen is in group 6 which means it holds 6 valence electrons, leaving 2 for bonds.

A valence electron is an outer shell electron that can form a chemical bond if the outer shell is not closed.

Now when an atom bonds to another in a single bond, both atoms contribute one valence electron in order to form a shared pair.

In the picture O has 7 Valence electrons, so it would have a negative charge of 1.

The middle Hydrogen has 3 valence electrons which would make hydrogen have a charge of negative 1.

Should look like this

        ..                      ..

H .   .O.    .H   =   H-O-H

        ..                      ..

Answer:

73.5%

Explanation:

Step 1:

Data obtained from the question.

Theoretical yield = 0.721Kg

Actual yield = 530g

Percentage yield =..?

Step 2:

Conversion of 0.721Kg to grams. This is illustrated below:

1Kg = 1000g

Therefore, 0.721Kg = 0.721 x 1000 = 721g

Step 3:

Determination of the percentage yield.

The percentage yield can be obtained by using the following formula:

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 530/721 x 100

Percentage yield = 73.5%

Therefore, the percentage yield is 73.5%

Answer:

73.5%

Explanation:

plato

Answer:

1. 3H2S + 2HNO3 -----> 2NO + 4H2O + 3S

Explanation:

H2S + HNO3 ----->  NO + H2O + S

There are 3 O's on left and  only 2 on right so  put 2 before NO:

H2S + HNO3 ----> 2NO + H2O + S

Now we have 2 N's on left so put 2 before HNO3:

H2S + 2HNO3 -----> 2NO + H2O + S

4 H's on the left so

H2S + 2HNO3 -----> 2NO + 2H2O + S

That makes 6 O's on left so  we write

H2S + 2HNO3 ----> 2NO + 4H2O + S

Now there 8 H's on the right but only 4 on the right so we adjust H2S and S:

3H2S + 2HNO3 -----> 2NO + 4H2O + 3S

Now it balances!

Basically you 'play around' with the  quantities of each element in this way.

Answer:

'H' ion has only one proton and do not have any electron and neutron.

Explanation:

Hydrogen atom has only one electron and one proton and when it loses that electron, hydrogen ion (H+) is formed which is positively charged (charge of +1) and referred as a proton.

So, hydrogen ion do not left with any electrons or have zero electrons.

Hydrogen (H) atom do not have any neutrons in its tiny nucleus, so hydrogen ion (H+) also do not have neutrons.

Hence, 'H' ion (H+) has only proton and zero electron and neutron.

Answer:

1M

Explanation:

The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.

Hope this helps!