HELP please it’s due soon

Answer:

14

Explanation:

Atomic mass = protons + neutrons

6 + 8 = 14

Explanation:

When water changes state from liquid to gas, this is Evaporation. (C)

When you apply heat to liquid water it will convert into gas. This process is called evaporation.

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:

-40J

Explanation:

E= -w+q

E= -75J+30J

E= -40J

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

I am sorry I don't know, points are points though

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:

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:

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:

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.

Answer:

7

Explanation:

3x6=18 leavig 7 behind

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

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:

it would be balanced forces.

Explanation:

Balanced forces acting on an object do not change the objects motion.

Answer:

Answer is A

Explanation:

this is because selective breeding means selecting plants or animals having desired characteristics and let them breed with each other to reproduce an offspring having desired characteristics from both parents.

Answer:

A

Explanation:

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 ✔️

Answer:

because the minerals in the rock can't be used until they are separated

Answer:

It was answer

A)1935J

Explanation:

The integumentary system functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature. Cell membrane performs the same function as the integumentary system. Therefore, option A is correct.

The cell membrane performs a function that is similar to the integumentary system. The cell membrane is a thin, flexible layer that surrounds the cell and acts as a barrier between the cell and its external environment.

It helps to regulate the movement of substances in and out of the cell, maintain the balance of fluids and electrolytes, and protect the cell from harmful substances.

The cell membrane can also play a role in temperature regulation, as it helps to maintain the proper internal environment of the cell.

Thus, option A is correct.

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Answer:

Plants : Cactus, tumbleweed

Animals : camel, fennec fox

Answer:

Desert plant - Cactus & Tumbleweed

Desert animal - Camel & Scorpion

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:

Metal atoms and non-metal atoms do different things when they ionise. Metal atoms lose the electron, or electrons, in their highest energy level and become positively charged ions. Non-metal atoms gain an electron, or electrons, to become negatively charged ions.

Explanation:

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: D. Exactly one reactant is a solid, and exactly one product is a gas.

Explanation: PLATO

In the given reaction, there is only one reactant in solid state, that is copper carbonate and one gaseous product carbon dioxide. Hence, option D is the correct statement.

Copper carbonate is an ionic compound formed by the combination of copper metal and carbonate group. Copper metal loses two electrons to the carbonate group. It is a white powder and sparingly soluble in water.

The states of reactants and products in a reaction is represented  in brackets with the chemical formula of each compound. The reaction in which all the reactants are in same phase is called homogeneous.

The given reaction is an example of heterogeneous replacement reaction. The reaction includes the combination of solid copper carbonate with aqueous  HCl giving copper chloride solution and carbon dioxide gas. Thus, option D is correct.

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Answer:

The answer is eight atoms.