Can someone plzzzzz helppppp me plzzzzzz( and don’t tell me to click a link it doesn’t work)

Answer:

Carbon monoxide, (CO), a highly toxic, colourless, odourless, flammable gas produced industrially for use in the manufacture of numerous organic and inorganic chemical products; it is also present in the exhaust gases of internal-combustion engines and furnaces as a result of incomplete conversion of carbon or carbon

Explanation:

Answer:

why joy deleting my answer

Explanation:

Answer:

the answer is d all of them are used

Answer:

all of them are correct types used/ mites

Explanation:

I did some research and apparently all of the above are types of insects used to determine time of death....but Im not 100% sure about mites( it Is said that they are used to provide forensically important information to estimate the post mortem interval, post berial interval, cause of death and relocation of dead body).

i hope this helps

Answer:

3.0x10¹⁹ atoms

Explanation:

First we convert 10 mg of mercury into grams:

Then we convert 0.01 g of mercury into moles, using its molar mass:

Then we convert moles into number of atoms, using Avogadro's number:

Answer:

Explanation:

Calcium is all around us. The average human contains approximately 1kg of calcium, of which 99% is stored in our bones. It is the 5th most abundant element in the earth's crust, occurring widely as calcium carbonate which is more commonly known as limestone. It is also the fifth most abundant dissolved ion in seawater.

Answer:

3

Explanation:

Answer:

Their vibrating particles are packed together in relatively fixed positions.

Explanation:

As you can see in the image below, solid is packed together.

Model 1 is an ion; Model 3 is an isotope identifies the models that represent an ion and an isotope of the original atom. Therefore, option A is correct.

Isotopes are atoms that have the same number of protons but different numbers of neutrons. They have nearly identical chemical properties but differ in mass and thus in physical properties.

Neutrons exist to stabilize the nucleus without them, the nucleus would be nothing more than a cluster of positively charged protons. There are different isotopes because there are different ways of stabilizing the protons.

Model 1 is an ion and Model 3 is an isotope identifies the models that represent an ion and an isotope of the original atom. The image of the model is attached below:

Thus, option A is correct.

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A rain gauge is really just a cylinder that catches rain. If an inch collects in the cylinder, it means an inch of rain has fallen. It's that simple. Most standard rain gauges have a wide funnel leading into the cylinder and are calibrated so that one-tenth of an inch of rain measures one inch when it collects inside.

Answer:

pH = 10.11

Explanation:

Hello there!

In this case, since it is possible to realize that this base is able to acquire one hydrogen atom from the water:

[tex]C_{18}H_{21}NO_4+H_2O\rightleftharpoons C_{18}H_{21}NO_4H^+OH^-[/tex]

We can therefore set up the corresponding equilibrium expression:

[tex]Kb=\frac{[C_{18}H_{21}NO_4H^+][OH^-]}{[C_{18}H_{21}NO_4]}[/tex]

Which can be written in terms of the reaction extent, [tex]x[/tex]:

[tex]Kb=\frac{x^2}{0.00500M-x}=3.39x10^{-6}[/tex]

Thus, by solving for [tex]x[/tex] we obtain:

[tex]x_1=-0.000132M\\\\x_2=0.0001285M[/tex]

However, since negative solutions are now allowed, we infer the correct [tex]x[/tex] is 0.0001285 M; thus, the pOH can be computed:

[tex]pOH=-log(x)=-log(0.0001285)=3.89[/tex]

And finally the pH:

[tex]pH=14-pOH=14-3.89\\\\pH=10.11[/tex]

Best regards!

Answer:

4Al + 3O2 ------> 2Al2O3

the mole ratio is 4:2

you divide 250 by 2

you get 125 and that's the mass produced

Answer:

1. Hay aceleración.

2. No hay aceleración.

3. Hay aceleración

Explanation:

Para responder esta pregunta hay que tener en cuenta que existe aceleración cuando hay una variación en la velocidad:

No they are not, as climate is long term conditions for an area while weather is temporary

Answer:

Atmoshphere!

Explanation:

I took the test and got a 100%! :) Hope this helps, plz mark brainliest!

I uploaded the answer to a file hosting. Here's link:

tinyurl.com/wpazsebu

Answer:

Cu2+

Explanation:

Answer:

There are six liquid elements present in the periodic table. They are bromine,mercury ,caesium,gallium,rubidium and francium.

The metalloids; boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At) are the elements found along the step like line between metals and non-metals of the periodic table.

The gaseous element group; hydrogen (H), nitogen (N), oxygen (O), fluorine (F), chlorine (Cl) and noble gases helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) are gases at standard temperature and pressure (STP).

Explanation:

Answer:

0.112M is molarity of the Na₂S₂O₃ solution

Explanation:

First, the KIO₃ reacts with KI as follows:

KIO3 (aq) + 5 KI (aq) + 6 HCl (aq) → 3 I2 (s) + 6 KCl (aq) + 3 H2O (l)

Then, the I₂ produced reacts with the Na₂S₂O₃ as follows:

2 Na2S2O3 + I2 → Na2S4O6 + 2 NaI

Thus, to solve this question, we need to obtain the moles of KIO₃ that react, then, the moles of I₂ produced -Using the chemical reaction- to find the initial moles of Na₂S₂O₃. With these moles and the volume we can find molarity of the solution:

Moles KIO₃:

21.45mL = 0.02145L * (0.0135mol/L) = 2.896x10⁻⁴ moles KIO₃

Moles I₂:

2.896x10⁻⁴ moles KIO₃ * (3mol I₂ / 1mol KIO₃) = 8.687x10⁻⁴ moles I₂

Moles Na₂S₂O₃:

8.687x10⁻⁴ moles I₂ * (2mol Na₂S₂O₃ / 1mol I₂) = 1.737x10⁻³ moles Na₂S₂O₃

As the volume of the titrated solution is 15.55mL, molarity is:

1.737x10⁻³ moles Na₂S₂O₃ / 0.01555L =

Answer:

2Na2S + Cd(NO3)2 ---> CdS + 2NaNO3

The coefficients therefore are 1,1,1&2

Answer:

69420

Explanation:

Answer:

We need to calculate number atoms, which can be determined as follows: We know that 1 mol contains 6.02214076×1023 number of atoms. i.e. is Avogadro's constant. Therefore the answer to the above question is that the number of atoms in 3.5 mol of Arsenic is 2.11×104 number of atoms.

Explanation:

Answer:

See explanation

Explanation:

When a substance is heated, its average kinetic energy increases as the molecules move faster owing to the supply of energy. The solvent molecules are able to collide more frequently with the solute molecules and dislodge them so that the solute can dissolve in the solvent.

However, when a gaseous solute is dissolved in a liquid; as the temperature is increased and solvent molecules are able to collide more frequently with the solute molecules and dislodge them, gas molecules dissolved in the liquid are more likely to escape to the gas phase and not return due to the increase in their kinetic energy.

Hence, solubility of gas solutes in water decreases as temperature increases.

Answer:

[tex]3 g/cm^{3}[/tex]

Explanation:

Density is a measure of a substance's mass over its volume.

d = m/v

Therefore d = 60g/20cm3 = 3 g/cm3

Answer:

Gas

Explanation:

I dunno but a lucky guess i guess

Answer:

A liquid's vapor pressure is directly related to the intermolecular forces present between its molecules. The stronger these forces, the lower the rate of evaporation and the lower the vapor pressure.

Explanation:

Answer:

vapor is bad it is the worst thing

Answer:

Water is unique because of our need to survive on something so simple. It is just 2 hydrogen atoms and an oxygen. so simple, but necessary for all of our lives. Just 3-4 minutes without it causes permanent damage

Answer:

I think 6 miles

Explanation:

6 miles is larger than 30,000 feet.

To compare the sizes of 6 miles and 30,000 feet, we need to convert one of the measurements to the same unit as the other. Since both miles and feet are units of length, we can convert one to the other.

1 mile is equal to 5,280 feet. Therefore, to convert 6 miles to feet, we multiply by the conversion factor:

6 miles × 5,280 feet/mile = 31,680 feet

Now we can compare 31,680 feet to 30,000 feet. Since 31,680 feet is larger than 30,000 feet.

Hence, we can conclude that 6 miles is larger than 30,000 feet.

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Answer:

Explanation:

All compounds are molecules, but not all molecules are compounds. That is because a molecule can be made up of two atoms of the same kind, as when two oxygen atoms bind together to make an oxygen molecule. However, all compounds are made up of two or more different types of atoms.

Answer:

the last one

Explanation:

Answer:

Number of moles: 0.07407407407

Answer:

a. Ca(OH)₂ = 74.08 g/mol

b. H₂O₂ = 34 g/mol

c. KCl = 74.55 g/mol

d. NaH₂PO₄  = 119.97 g/mol

Explanation:

In order to determine the molar mass of each compound we need to sum, the molar mass of each element.

a. Ca(OH)₂

40.08 g/mol (Ca) + 2 . 16 g/mol (O) + 2 . 1 g/mol (H) = 74.08 g/mol

b. H₂O₂ → 2 . 1 g/mol (H) + 2 . 16 g/mol (O) = 34 g/mol

c. KCl → 39.1 g/mol (K) + 35.45 g/mol (Cl) = 74.55 g/mol

d. NaH₂PO₄

23 g/mol (Na) + 2 . 1 g/mol (H) + 30.97 g/mol (P) + 4 . 16 g/mol (O) = 119.97 g/mol