A diagram represents the life cylce of a frog. The diagram shows that, in a frog...
1) methods of sexually reproduction depends on the species
2) metabolism is the sum of all chemical reactions
3) body structures change during development
4) Offspring always look like the adult

PLEASE HELP AND ANSWER

Answer:

The lowest possible melting point for engine coolant is -12.8°C

Explanation:

This is about colligative property about freezing point depression.

We think the data 30% as a %m/m. It means that 30 g of ethylene glycol are contained in 100 g of solution. Therefore, we have 70 g of solvent.

Formula for freezing point depression is:

ΔT = Kf . m . i

Where  ΔT = Freezing T° of pure solvent - Freezing T° of solution.

Freezing T° of solvent = 0° (We talk about water)

Let's determine m (molality, moles of solute in 1kg of solvent)

70 g = 0.070 kg

30 g . 1 mol / 62.07 g = 0.483 moles

0.483 mol / 0.070 kg = 6.90 m

We replace data in formula:

0° - Freezing T° of solution = 1.86 °C/m . 6.90m . 1

As ethylene glycol is a nonelectrolyte, i = 1

Freezing T° of solution =  - 12.8°C

Answer:

-40J

Explanation:

E= -w+q

E= -75J+30J

E= -40J

Answer:

umm probly glucose and oxygen.??

Explanation:

The equilibrium concentration  of N₂ : 1.992

Given

Kc = 6.0 x 10⁻² at 500°C

0.253 M H₂ and 0.044 M NH₃

Reaction

3H₂(g) + N₂(g) = 2NH₃(g)

Required

The equilibrium concentration  of N₂

Solution

Kc for the reaction :

[tex]\tt Kc=\dfrac{[NH_3]^2}{[H_2]^3[N_2]}\\\\0.06=\dfrac{0.044^2}{0.253^3\times [N_2]}\\\\(N_2]=1.992[/tex]

Answer:

The answer is eight atoms.

Answer:

2 C Atoms

Explanation:

When you have coefficient of 2 next to a compound element, it indicates there are 2 of each compound element. In the compound element, there is one C Atom, and 2×1 is 2.

Answer:

7

Explanation:

3x6=18 leavig 7 behind

Answer:

One element takes the place of another in a compound

Explanation:

a p e x - just did the test

The statement best describes a single-replacement reaction as one element takes the place of another in a compound. The correct option is A.

A single replacement reaction is one in which when the reaction happens, one element is substituted by another in a compound. It is also called displacement reaction. The replacing material will always be a pure element.

An example is Zn + 2HCl -> ZnCl₂ + H₂

Thus, the correct option is A. one element takes the place of another in a compound.

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Answer:

Use bags that are not of plastic and that we can reuse.

Explanation:

To reduce the number of petroleum, people should use everyday things that do not have plastic in their composition. For example, drink water from a flask made of iron, take your mug to the coffee store or use cloth bags. These elements are not disposable, and we can use them multiple times, which leads to a reduction in the consumption of plastic products and the amount of petroleum needed for their production.

Answer:

1. Polar

2. Non-polar

3. Non-polar

4. Polar

5. Non-polar

6. Polar

Explanation:

Polar bonds are formed between molecules that share electrons unequally/unevenly. In a polar molecule, one atom is more electronegative than the other i.e it attracts/pulls more electrons than the other atom, hence, it ends up leaving the other atom with a positive charge i.e fewer electrons around its atom. Also, every molecule that has a symmetrical arrangement is NON-POLAR while the opposite is POLAR.

Based on this, the answers to the asked questions are in BOLD.

1. A POLAR bond is one where there are more shared electrons grouped around one atom than the other.

2. A NON-POLAR bond is one where the electrons are evenly distributed between the two atoms sharing electrons.

3. A molecule with symmetry is NON-POLAR

4. A molecule that does not have symmetry is POLAR.

5. A NON-POLAR molecule has its valence electrons evenly distributed around the molecule.

6. A POLAR molecule has one of its sides with more or fewer electrons than the other sides.

Answer:

glycol, any of a class of organic compounds belonging to the alcohol family; in the molecule of a glycol, two hydroxyl (―OH) groups are attached to different carbon atoms. The term is often applied to the simplest member of the class, ethylene glycol.

Explanation:

Answer:

Glycol, any of a class of organic compounds belonging to the alcohol family; in the molecule of a glycol, two hydroxyl (―OH) groups are attached to different carbon atoms. The term is often applied to the simplest member of the class, ethylene glycol.

Answer:

12.044 ×10²³ molecules of HCl

Explanation:

Given data:

Number of moles of MgO = 1 mol

Number of molecules of HCl react = ?

Solution:

Chemical equation:

MgO + 2HCl       →     MgCl₂  + H₂O

with 1 mole of MgO 2 moles of HCl are react.

Number of molecules of HCl react:

1 mole contain 6.022×10²³ molecules

2 mol × 6.022×10²³ molecules / 1 mol

12.044 ×10²³ molecules

Explanation:

I think the answer is metric system of units

because it is the most widely used system of units and its use in both science and business.

Fe + O2 ⟶FeO2⟶FeO2​,As we can see our compound is FeO2FeO2​ which is a simple combination with the same stoichiometry, so we will just do a subtract operation : 3.7 kg - 3.5 kg $= 0.2 \ \text{kg} \Rightarrow 0.2\color{#4257b2}{0} $ kgkg (respecting significant figures rule).

Rust is the result of an iron and oxygen interaction together:It's an ionic since it is made up of the a metal and something that is not a metal.

Without water, rust cannot develop.Iron pipes frequently rust on the inside due to water vapor condensation on the metal.Moisture facilitates the electrolyte required for the reaction iron take place, which expedites the rusting process.

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Answer:

Ag⁺(aq) + Cl⁻(aq)       →      AgCl(s)  

Explanation:

Chemical equation:

AgNO₃(aq) + NaCl(aq)       →     AgCl(s) + NaNO₃(aq)

Balance chemical equation:

AgNO₃(aq) + NaCl(aq)       →     AgCl(s) + NaNO₃(aq)

Ionic equation

Ag⁺(aq)+ NO₃⁻(aq) + Na⁺(aq)+ Cl⁻(aq)       →      AgCl(s)  + Na⁺(aq)+ NO₃⁻(aq)

Net ionic equation:

Ag⁺(aq) + Cl⁻(aq)       →      AgCl(s)  

The NO₃⁻((aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The AgCl can not be splitted into ions because it is present in solid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

Answer:

Explanation:

Given parameters:

Mass of water  = 40g

Initial temperature  = 33°C

Final temperature  = 23°C

Specific heat capacity of water  = 4.2J/g°C

Unknown:

Quantity of heat = ?

Solution:

To solve this problem, we use the expression below;

       H  = m c Δt

H is the quantity of heat

m is the mass

c is the specific heat capacity

Δt is the change in temperature

      H  = 40 x 4.2 x (23 - 33) = -1680J

The water will have to lose 1680J of heat to bring it to that final temperature.

Answer:

The greater the ionization energy, the more difficult it is to remove an electron. The ionization energy may be an indicator of the reactivity of an element. Elements with a low ionization energy tend to be reducing agents and form cations, which in turn combine with anions to form salts.

Answer:

8.92 m/s

Explanation:

Distance covered = 107 m

Time = 12 s

Average speed = ?

The relationship between the parameters is given by;

Average speed = Distance covered / Time

Average speed = 107 / 12

Average speed = 8.92 m/s

Answer:

94.74 moles of NO₂ are produced.

Explanation:

Given data:

Volume of oxygen gas = 3714 L

Temperature = 273 K

Pressure = 1 atm

Moles of NO₂ produced = ?

Solution:

Chemical equation:

4NH₃  + 7O₂   →      4NO₂ + 6H₂O

Number of moles of oxygen:

At STP one mole of any gas occupy 22.4 L volume. Thus, 3714 L gas contain,

3714 L× 1  mol / 22.4 L

165.8 mol

now we will compare the moles of oxygen and nitrogen dioxide.

                    O₂         :        NO₂

                     7           :          4

                   165.8      :        4/7×165.8 = 94.74 mol

Thus, 94.74 moles of NO₂ are produced.

Answer:

yes when ammonium(NH4) react with chlorine then will we get ammonium chloride

Explanation:

Pure chlorine gas may react vigorously with ammonia gas. An excessive mix of the two gases in air can produce hazardous compounds such as the explosive nitrogen trichloride. ... Chlorine reacts readily with ammonium hydroxide to form ammonium chloride, a relatively harmless compound.

Answer:

Mass = 65.8 g

Explanation:

Given data:

Mass of sodium chloride = ?

Volume of solution = 1.5 L

Molarity of solution = 0.75 M

Solution:

Number of moles of sodium chloride:

Molarity = number of moles / volume in L

By putting values,

0.75 M = number of moles = 1.5 L

Number of moles = 0.75 M × 1.5 L

Number of moles = 1.125 mol

Mass of sodium chloride:

Mass = number of moles × molar mass

Mass = 1.125 mol × 58.5 g/mol

Mass = 65.8 g

Answer:

180,000 ants

Explanation:

For this problem we can create the following simple formula to solve this problem...

f(x) = 6x

where the variable x represents the number of ants that a single Anteater needs to eat per day. After a quick online search we can see that a single Anteater eats roughly 30,000 ants per day. If we use this value and plug it into the simple formula we can get the total number of ants 6 anteaters need to eat to survive.

f(x) = 6 * 30,000

f(x) = 180,000

Answer:

Deandre is correct.

Explanation:

When shiny pennies turn dull, due to getting rust. It gets cover with a layer of black or brown color on its surface on the exposure of air.

In this problem,

Deandre says, "I think they turn dull because they're exposed to the air over time." Jamie says, "I think they turn dull because they get dirt on them from being dropped on the ground." Selina says, "I think there is dull metal inside the penny the entire time.

Out of three friends, Deandre is correct. Shiny pennies turn dull because they're exposed to the air over time.

422600000 or 4,226x 10^8

Answer:

422.6*10^6

Explanation:

(4.2*10^8)+(2.6*10^6)

4.2*10^8+2.6+10^6

(4.2*10^2+2.6)*10^6

(4.2*100+2.6)*10^6

(420+2.6)+10^6

Final Answer:

422.6*10^6

The theoretical yield of the reaction : 151.64 g

The limiting reactant :  N₂

The excess reactant : H₂

Reaction

N₂+3H₂⇒2NH₃

A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients(mol ratio), and the smaller become a limiting reactant

mass of N₂=125 g

mol N₂(MW=28 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{125}{28}=4.46[/tex]

mass H₂ = 125 g

mol H₂(MW= 2 g/mol) :

[tex]\tt mol=\dfrac{125}{2}=62.5[/tex]

From the equation, mol ratio N₂ : H₂ = 1 : 3

Limiting reactant : N₂ : H₂ =

[tex]\tt \dfrac{4.46}{1}\div \dfrac{62.5}{3}=4.46\div 20.8[/tex]

N₂  : limiting reactant

H₂ : excess reactant

mol NH₃ based on limiting(N₂) (from equation N₂ : NH₃ = 1 : 2)

[tex]\tt mol~NH_3=\dfrac{2}{1}\times 4.46=8.92[/tex]

mass NH₃ (MW=17 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=8.92\times 17=151.64[/tex]

Answer:

The actual reason that the application of salt causes ice to melt is that a solution of water and dissolved salt has a lower freezing point than pure water. When added to ice, salt first dissolves in the film of liquid water that is always present on the surface, thereby lowering its freezing point below the ices temperature. Ice in contact with salty water therefore melts, creating more liquid water, which dissolves more salt, thereby causing more ice to melt, and so on.

Answer:

AlCl3

Explanation:

since the stable oxidation state of Aluminum is +3, and that of Chlorine is +1, then it will give such a formulae ✔️