PLEASE HELP EMERGENCY ‼️‼️ needed ASAP

Answer:

Metal salts commonly used in firework displays include: strontium carbonate (red fireworks), calcium chloride (orange fireworks), sodium nitrate (yellow fireworks), barium chloride (green fireworks) and copper chloride (blue fireworks).

Explanation:

Answer:

Metal salts commonly used in firework displays include: strontium carbonate (red fireworks), calcium chloride (orange fireworks), sodium nitrate (yellow fireworks), barium chloride (green fireworks) and copper chloride (blue fireworks).

The colors are produced by heating metal salts, such as calcium chloride or sodium nitrate, that emit characteristic colors. ... Barium – Barium is used to create green colors in fireworks, and it can also help stabilize other volatile elements. Calcium – Calcium is used to deepen firework colors

Answer:

can u explain a little more then i will help like what are the four

Explanation:

Answer:

d) U-238

Explanation:

edg 2021

Answer:

you need a theripist or maybe just your girl if this is your question.

Explantion: you are clearly very weird but very cute and ily.

Answer:

2969429th Ave

Explanation:

i dont know

The one on the top left corner is condensation. The one below that is evaporation. The one below that in the water is accumulation. The one next to accumulation is ground flow. The one on the trees is transpiration. The one above transpiration is surface flow. The one above surface flow is precipitation and above precipitation it’s condensation. Lmk if you were able to get that.

For the first

H : O : H

Theres two bonds here

Each other are sigma

So 2Sigma bonds present

For the Second

I believe you wanted to write Ethyne....

In a triple bond... Theres 1sigma and 2 Pi bonds

Every single bond is a sigma bond

So

Counting all

we have

2Pi bonds and 3Sigma bonds

Answer:

6.55 x 10^22 atoms K

Explanation:

Convert from grams to moles (using K molar mass)

K molar mass = 39.098 g/mol

4.25 g K x 1 mol K / 39.098 g K

[grams cancel out]

= 0.1087 mols K

Convert from moles to atoms (using Avogadro's number)

Avogadro's number = 6.0221 x 10^23

0.1087 mols K x 6.0221 x 10^23 atoms K / 1 mols K

[mols cancel out]

= 6.545987 x 10^22

[with proper significant digits.....]

= 6.55 x 10^22 atoms K

Answer:

39.2 g

Explanation:

First we convert 55.3 grams of Ni₂O₃ into moles of Ni₂O₃, using its molar mass:

Then we convert 0.334 moles of Ni₂O₃ into moles of Ni, using the stoichiometric coefficients of the balanced reaction:

Finally we calculate how much do 0.668 Ni moles weigh, using the molar mass of Ni :

Answer:

= -592 (7+3)

= 592 ×10

= -5920

hope it helps u

Mark me brainless

Answer:

The formula for volume of a rectangle is length multiply by width multiply thus, 0.25 m multiply 6.1 m multiply by 4.9 m = 7.5m^3.

Explanation:

the least number of significant figures is 2 thus the final answer will have the same number of significant figures. 7.5m^3

Answer:

5250 grams or 5.25 kg of carbon monoxide and 375 grams of hydrogen are required to form 6 kg of methanol.

Explanation:

The balanced reaction:

CO (g) + 2 H₂ (g) -> CH₃OH (l)

By stoichiometry of the reaction, the following amounts of moles of each compound participate in the reaction:

Being the molar mass of each compound:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Being 6 kg equivalent to 6000 grams (1 kg= 1000 grams), you can apply the following rules of three:

[tex]mass of carbon monoxide=\frac{6000 grams of methanol*28 grams of carbon monoxide}{32 grams of methanol}[/tex]

mass of carbon monoxide= 5250 grams= 5.25 kg

If by stoichiometry 32 grams of methanol are formed from 2 grams of hydrogen, 6000 grams of methanol are formed from how much mass of hydrogen?

[tex]mass of hydrogen=\frac{6000 grams of methanol*2 grams of hydrogen}{32 grams of methanol}[/tex]

mass of hydrogen= 375 grams

5250 grams or 5.25 kg of carbon monoxide and 375 grams of hydrogen are required to form 6 kg of methanol.

Geometric isomers have the same structural formulas but differ in the arrangement of groups at a single atom, at double bonds, or in rings. ... One of the optical isomers rotates the light in one direction, the other rotates the light in the opposite direction but by the same amount.

Answer:

The correct answer is - neutrons.

Explanation:

Uranium has various isotopes found naturally that are three 238U, 235U, and 234U. Uranium has an atomic number of 92 which means there are 92 protons and 92 electrons in the atomic structure.

Isotopes have the same number of protons but a different number of neutrons that can vary from 141 to 146. U-238 has 146 neutrons in the nucleus, whereas 235 U has 143 neutrons.

The U- 238 has more neutrons than U- 235. Atomic mass is the sum total of the nucleons or protons and neutrons.

What are Isotopes?

They are the different variants of the same molecules which have the same number of protons but the different number of neutrons.

Atomic mass is the sum total of the nucleons or protons and neutrons. The atomic number of Uranium is 92, the rest of the mass comes from neutrons.

Therefore, the U- 238 has more neutrons than U- 235.

Learn more about Isotopes:

https://brainly.com/question/9099776

Answer:

[tex]V_2=10L[/tex]

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to calculate the required new volume by using the Charles' law as a directly proportional relationship between temperature and volume:

[tex]\frac{V_2}{T_2} =\frac{V_1}{T_1}[/tex]

In such a way, we solve for V2 and plug in V1, T1 and T2 to obtain:

[tex]V_2=\frac{V_1T_2}{T_1}\\\\V_2=\frac{5.0L*600K}{300K}\\\\V_2=10L[/tex]

Regards!

Answer: The partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.

Explanation:

Given: Mole fraction of oxygen = 0.21

Total pressure = 111.7 atm

It is known that the sum of moles fractions is always equal to 1. So, mole fraction of nitrogen is calculated as follows.

Mole fraction of nitrogen + mole fraction of oxygen = 1

Mole fraction of nitrogen = 1 - mole fraction of oxygen

Mole fraction of nitrogen = 1 - 0.21

Mole fraction of nitrogen = 0.79

Now, formula used to calculate the partial pressure of nitrogen is as follows.

[tex]P_{N} = X_{N} \times P_{total}[/tex]

where,

[tex]P_{N}[/tex] = partial pressure of nitrogen

[tex]X_{N}[/tex] = mole fraction of nitrogen

[tex]P_{total}[/tex] = total pressure

Substitute the values into above formula as follows.

[tex]P_{N} = X_{N} \times P_{total}\\= 0.79 \times 111.7 atm\\= 88.243 atm[/tex]

Thus, we can conclude that the partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.

Answer:

A. Yes

B. The new temperature of the gas is -116 °C

Note: The question is incomplete. The complete question is given below :

For many purposes we can treat butane C H10) as an ideal gas at temperatures above its boiling point of - 1. °C. Suppose the pressure on a 500 mL sample of butane gas at 41.0°C is cut in half. Iyes Is it possible to change the temperature of the butane at the same time such that the volume of the gas doesn't change? yes no If you answered yes, calculate the new temperature of the gas. Round your answer to the nearest °C.

Explanation:

A. According to the pressure law of gases,for a fixed mass of gas the pressure of a gas is directly proportional to its Kelvin temperature once the volume is kept constant. This means that a change in temperature can bring about a change in pressurein a gas at constant volume.

B. From the pressure law of gasese: P1/T1 = P2/T2

Where initial pressure = P1, final pressure = P2

Initial temperature = T1, final temperature = T2

For the butane gas;

P1 = P

P2 = P/2

T1 = 41°C = (273 + 41 ) K = 314 K

T2 = ?

From the equation, T2 = T1 × P2 / P1

T2 = 314 × P/2 /P

T2 = 157 K

T2 = (157 - 273) °C = -116 °C

Therefore, the new temperature of the gas is -116 °C

Solution :

Given :

Hydrogen iodide decomposes to hydrogen and iodine gas

    [tex]$2 HI \ \ \ \Leftrightarrow \ \ \ \ H_2 \ \ \\ + \ \ I_2 $[/tex]

I    0.148            0          0

C     -2a           +a          +a

E  0.148-2a      a            a

We know

[tex]$k_p=\frac{P(H_2)P(I_2)}{P(HI)^2}$[/tex]

[tex]$0.016=\frac{a^2}{(0.148-2a)^2}$[/tex]

[tex]$0.016^{1/2}=\frac{a}{0.148-2a}$[/tex]

[tex]$0.12649=\frac{a}{0.148-2a}$[/tex]

0.0187 = 1.2529 a

a = 0.0149

Therefore

P(HI) = 0.148 - 2a

        = 0.148 - 2(0.0149)

        = 0.1182 atm

P([tex]$H_2$[/tex]) =  a

        = 0.0149 atm

P([tex]$I_2$[/tex]) =  a

        = 0.0149 atm

Answer:b

Explanation:

Answer: It is :B:

Explanation: also sub to technoblade

Answer: Electrons

Explanation:

Answer:

K + F2 = KF

Explanation:

Thats the balancee equation for potassium fluoride. The equation is 2K + F2 → 2KF and the balanced equation is K + F2 = KF

Answer:

B

Explanation:

conduction is the transfer of heat between objects that touch

Answer:

Option 3 and 4

Explanation:

In an endothermic reaction, the potential energy of the system increase. The potential energy of the reactant is less as compared to the potential energy of the products and hence additional energy is required to produce products.

The potential energy of the reactants depend on their chemical state and not the physical state. Hence, option 2 is not correct. Also, the number of reactant do not make any significant impact on the determination of potential energy of reactants. Thus, option 1 is also incorrect

Answer:

Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth.

Answer: A chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.

Explanation:

When the concentration of both the reactants and products do not change with time then it means the chemical reaction has reached to a state of chemical equilibrium.

For example, [tex]CO(g) + Cl_{2}(g) \rightleftharpoons COCl_{2}(g)[/tex]

Therefore, we can conclude that a chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.

Answer: I believe the answer is d)  the rock crumbles at an ocean ridges

Explanation: