Question 13 of 25
How has the work of chemists affected the environment over the years?
A. Chemists have both hurt the environment and helped the
environment by their actions.
B. Chemists have tried very hard not to impact the environment with
their work.
C. Chemists have ruined the environment through the misuse of
poisonous chemicals.
O D. Chemists have belan required to fix all environmental problems
that they have caused.

Answer:

different forms of genes for a single trait

Explanation:

There are three main forms  of genes  that can exist for a single trait and they are:

A dominant allele is a stronger version of a gene that shows up when at least one copy of it is present in an organism's genetic makeup. It hides the effects of the weaker gene. In a person with two different alleles, the one that is more powerful decides how the person looks or behaves.

Recessive allele: A recessive allele is only expressed when there are two of the same recessive alleles present. It is hidden by a strong gene. The recessive allele can only be seen when a person has two copies of it.

Co-dominant alleles: When co-dominant alleles are together, both are shown. In this situation, neither gene is stronger than the other, and both play a role in what an organism looks like. One example of co-dominance is the ABO blood type system. In this system, both the A and B alleles are of equal importance.

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Answer:

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Answer:

controlled by the Arabs, who brought frankincense and myrrh by camel caravan from South Arabia.

Answer:

1. a) 1.27 mol H₂SO₄

2. b) 19 g KCl

Explanation:

The grass method is an acronym for Given, Required, Application, Solution, Statement.  

1. a) Given, 125g H₂SO₄; Required, find the moles H₂SO₄; Application, 125g x molar mass of H₂SO₄, Solution, [tex]125g H2SO4 * \frac{1molH2SO4}{98.08gH2SO4} = 1.274469molH2SO4[/tex] Statement, Round to the lowest number of significant figures to get 1.27 mol H₂SO₄;

2. b) I am only show the equation for this one, but it is basically the same as the previous one. The molar mass of KCl is 74.55 g/mol.

[tex]0.25molKCl*\frac{74.55gKCl}{1molKCl} = 18.6375 gKCl[/tex]

Round to the lowest number of significant figures which is two to get 19 g KCl.

For 3 the unit converter between moles and molecules is 6.022 x 10²³ molecules/mol.

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Answer:

white

Explanation:

Answer:pruducts Explanation:

Answer:

The Reactants

Explanation:

A P E X

Answer:

If the cart accelerates at 3.5m/s2, what is the net external force exerted by the vendor? Given: Solution: m= 13kg F=ma a= 3.5m/s2 =13kg x 3.5m/s2 Find: =45.5kg*m/s2 or 45.5 N Fnet The net force exerted by the vendor was 45.5N. 4. 2.

Explanation:

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Answer: Hydrogen

Explanation: The Bohr Atom is a very simplified model of the electron positions of each element of the Periodic Table. Each Row of the periodic table is represented by an orbit. Hydrogen and Helium are in the first energy level (row) of the periodic table and their Bohr Models would have one orbit.

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Answer:

c. Endothermic

Explanation:

endothermic reactions absorb heat, exothermic reactions release heat.

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[tex]\sqrt[n]{x} \int\limits^a_b {x} \, dx \geq x^{2} \sqrt{x} \neq \lim_{n \to \infty} a_n \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \pi \sqrt[n]{x} \frac{x}{y} \alpha \beta x_{123} \\ \leq \left \{ {{y=2} \atop {x=2}} \right. \int\limits^a_b {x} \, dx \int\limits^a_b {x} \, dx \geq \geq \geq \geq x^{2} x^{2} x^{2} \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\rig[/tex]

Answer:

liquid

Explanation:

Answer:

liquid

Explanation:

The density in kg/m³ = 1.14 x 10⁴

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density  

The unit of density can be expressed in g/cm³ or kg/m³  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density , g/cm³ or kg/m³  

m = mass  , g or kg

v = volume  , cm³ or m³  

A density of Lead : ρ = 11.4 g/cm³

the density in kg/m³ :

[tex]\tt 11.4~\dfrac{g}{cm^3}\times \dfrac{kg}{10^3~g}\times \dfrac{cm^3}{10^{-6}~m^3}=\boxed{\bold{1.14\times 10^4~\dfrac{kg}{m^3}}}[/tex]

Answer:

A represents London dispersion forces, and B represents hydrogen bonding.

Explanation:

The Intermolecular force between two non polar molecules will be weaker London-dispersion forces. The bond between a hydrogen containing molecule with another molecule of an electronegative atom such as O, N etc. is hydrogen bond.

Intermolecular forces are forces between two molecules that bind them together. The force of attraction is generated by sharing of electrons or by donation of electrons.

Non-polar molecules are those with no charge separation. But when two non-polar molecules comes in contact a temporary dipole will create there and they attract each by the opposite charge ends. This type of force is called London dispersion force.

One molecule with a hydrogen atom is able to form a hydrogen bond with an electronegative atom of another molecule due to the electronegativity difference between hydrogen atom and atoms like N, O, F etc.

Therefore, the intermolecular force A is London-dispersion force and B is hydrogen bonding. Hence, option A is correct.

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The number of particles : 2.75 x 10²¹

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12  

1 mole = 6.02.10²³ particles  

[tex]\tt n=\dfrac{N}{N_o}[/tex]

N = number of particles  

No = Avogadro number (6.02.10²³)  

n = number of moles  

While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule  

0.75 gram sample of Calcium Nitrate; Ca(NO₃)₂

MW of Ca(NO₃)₂ : 164.09 g/mol

[tex]\tt mol~Ca(NO_3)_2=\dfrac{0.75}{164.09}=0.00457[/tex]

The number of particles

[tex]\tt N=n\times N_o\\\\N=0.00457\times 6.02\times 10^{23}=2.75\times 10^{21}[/tex]

Answer:

boiiiiiiiiiii

Explanation:

Answer:

14.0 g

Explanation:

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The mass in grams of sodium chloride must be added to make 400 mL of a 0.600 M sodium chloride is 14 grams.

Mass of any substance will be calculated by using their moles as:
n = W/M, where

W = required mass

M = molar mass

Also we know that, molarity of any solution is define as the number of moles of solute present in per liter of the solution.

M = n/V, where

M = molarity of NaCl = 0.600M

V = Volume of solution = 400mL = 0.4L

n = (0.6)(0.4) = 0.24moles

Now mass of NaCl will be calculated by using the first equation as:

W = (0.24mol)(58.44g/mol) = 14grams

Hence required mass of NaCl is 14 grams.

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Answer:

homogeneous mixture

Explanation:

The correct classification for air is a homogeneous mixture.

Material is referred to as a mixture when two or more chemicals combine without undergoing a chemical reaction.

Heterogeneous and homogeneous mixtures are the two types of mixtures.

While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components.

A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

Mixtures are composed of two or more different substances that have not been chemically mixed. The following is a list of mixture properties.

Each of the components in a mixture retains its unique features.

Component separation is simple to carry out.

The component's relative weights vary.

The classification for air is 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases.

This classification for air has the properties of a homogeneous mixture.

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Answer:

-3

Explanation:

The charge of the ion is determined by the number of protons and the number of electrons.

Protons are a positive + charge.

Electrons are a negative - charge.

We have 7 protons and 10 electrons.

+7 charge

-10 charge

-10 + 7 = -3 charge

Answer:

what is the question????

Answer:

If the pressure of the system increases then the boiling point will increase.

If the pressure of the system decreases then the boiling point will decrease. If there is no change in pressure then the boiling point will remain constant.

Explanation:

Answer:

Na₂SiO₃

Explanation:

Answer:

A.

Explanation:

Answer:

b

Explanation:

Calcium Chloride would have a charge of +2

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Answer:

Valence electrons are the electrons on the outermost energy level of an

atom.

The correct answer will be Valence electrons are the electrons on the outermost energy level of an atom.

Answer: analyze the question so that you can get a correct answer

Explanation:

Answer:

d

Explanation:educated guess