An atom has a mass number of 43 and an
atomic number of 23. How many protons
does it have?

Answer:

True

Explanation:

Answer: 0.5 M

Explanation:

molarity = (moles of solute)/(liters of solution)

Hence, the molarity is (0.234)/(0.5) = 0.5 M (to 1 s.f.)

answer is a and no need to worry

Answer: correct. Adminstrators

Explanation:

First, we write the reaction and balance it:

HNO2 (aq) + NH3 (aq) = NH4+ + NO2- (Balanced)

Data:

50 mL of 0.2 M HNO2

50 mL of 0.2 M NH3

In total, we have 100 mL, therefore, this solution between HNO2 and NH3 will be diluted in half. I mean: The concentration of HNO2 and NH3 will be 0.10 M

HNO2 (aq) + NH3 (aq) = NH4+ + NO2-

Initial 0.10 M 0.10 M 0 0

reacts -x -x +x +x

Equilibrium 0.10-x 0.10-x +x +x

Now, we write Kc:

Values of x:

For 1) x = 0.0999

For 2)x = 0.1001

We choose number 1) x = 0.0999

Number 2 gives us a value higher than the initial values of concentration

Therefore, concentration in equilibrium of NH3 = 0.10-x =0.10 - 0.0999 = 0.00010M

Answer: A. 0.00010M

Answer:

14 grams of calcium oxide would be produced by thermal decomposition of 25 grams of calcium carbonate.

Explanation:

You know:

CaCO₃ → CaO + CO₂

In the first place, by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) the following quantities react and are produced:

Being:

the molar mass of the compounds participating in the reaction is:

Then, by stoichiometry of the reaction, the following mass amounts of the compounds participating in the reaction react and are produced:

You can then apply the following rule of three: if by stoichiometry of the reaction 100 grams of calcium carbonate CaCO₃ produce 56 grams of calcium oxide CaO, 25 grams of CaCO₃ how much mass of CaO will it produce?

\(mass of calcium oxide=\frac{25 grams of CaCO_{3} *56 grams of CaO}{100 grams of CaCO_{3} }\)

mass of calcium oxide= 14 grams

14 grams of calcium oxide would be produced by thermal decomposition of 25 grams of calcium carbonate.

The name of binary ionic cpd composed of the lithium cation and the chlorine anion is called Lithium chloride (LiCl). In Chemistry, the lithium chloride is an ionic compound consisting of lithium and chlorine.

It has a white or colourless solid structure in the form of a crystal. The lithium chloride formula is LiCl. It is a compound that is highly soluble in water and its solutions conduct electricity. Lithium chloride is used as a desiccant, a flux for welding and soldering, and a starting material in the synthesis of various other lithium compounds.

It is also used as an important reagent in organic synthesis. It is also useful in the production of ceramics and in the manufacture of lithium-ion batteries. In conclusion, the name of the binary ionic cpd consisting of the lithium cation and chlorine anion is Lithium chloride (LiCl).

To know more about cation  visit;-

https://brainly.com/question/28710898

#SPJ11

The density of the carbon tetrachloride sample is 1.58 g/cm³.

We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as

ρ = m / V

where ρ is density, m is mass and V is volume

From the question above, we know that

V = 1 L

m = 1.58 kg

Convert the mass of the sample to grams

m = 1.58 kg

m = 1.58 x 1000 g

m = 1580 g

Convert the volume to cc

V = 1 L = 1 dm³

V = 1 x 1000 cm³

V = 1000 cm³

By substituting the following parameters, we get

ρ = m / V

ρ = 1580 / 1000

ρ = 1.58 g/cm³

Find more on density at: https://brainly.com/question/406690

#SPJ4

Answer:

Here is your answer

Explanation:

Please mark me brainliest

Answer:

You haven't put an image so that I can determine your answer

Explanation:

Answer:

Point A represents a location on a tectonic plate boundary. Plates X and Y represent major tectonic plates. The island of Crete; the Anatolian Plate, which is a minor tectonic plate; and the Hellenic Trench have been labeled. Arrows indicate the relative directions of plate motion.

Explanation:

Answer:

Explanation:

When I was growing up, one of the most popular cartoons was a little possum whose name was Pogo. He often said

“We have met the enemy and he is us.”

It is something Pogo said more than once. We are the problem with biodiversity being threatened.

We clear land for agriculture, not only in Canada and the United States, but in places like Brazil where it matters what is done to the environment. Those trees are the planet's lungs. Whole environmental groups are devoted to stopping the harvesting of trees that are hundreds of years old.

Our oceans have become cesspools of plastic.

Our rivers have become dumping grounds for all kinds of pollutants like paint and car tires to name just a couple.

Our landscape has been cluttered by billboards advertising things that are hundreds of miles away.

There's mining, oil, and other industries that make Mother Nature shudder every time they come near her.

✯Correct Answer✯:

The correct answer that you are looking for would be:  

B.) Habitat loss

♪Explanation♪:

Habitat loss answer option is correct because removing trees deprives the forest of portions of its canopy, which blocks the sun’s rays during the day and retains heat at night. That disruption leads to more extreme temperature swings that can be harmful to plants and animals. Yet the effects of deforestation reach much farther, it is very sad for the environment ＞﹏＜.

I hope this helped you,

And I do hope you enjoy the rest of your day!  Here take this heart you need it. (ɔ◔◡◔)ɔ ♥          

-Kirby ★ ツ ✌                 

The  things like magic, astrology and psychic predictions not considered science as it only consider on the proves given by the experiments and the theory not on the random predictions.

The science, any universe of source of knowledge that deals with the physical and chemical  world and its processes and that deals with the observations and experimentation with conclusion and results.

The magic is about the secret tricks done by magician and astrology is the observing the space and universe all above the earth and psychic deals with the human psychology.

Therefore, things like magic, astrology and psychic predictions not considered science as it only consider on the proves given by the experiments and the theory not on the random predictions.

Learn more about science, here:

https://brainly.com/question/18186842

#SPJ2

Answer:

D

Explanation:

The mass of sucrose that is hydrolyzed when 2.60 l of a 0.160 m sucrose solution is allowed to react for 200 min is 106.40g.

For first order reactions:

ln{[A]0 / [A]} = kt

Let initial concentration of A is [A]0 = 0.130M

So

ln{0.130M / [A]} = (1.8*10^-4s^-1)(190min)

ln{0.130M / [A]} = (1.8*10^-4s^-1)(190min)(60s / 1min)

ln{0.130M / [A]} = 2.05

{0.130M / [A]} = e^2.05

{0.130M / [A]} = 7.77

[A] = 0.130M / 7.77

= 0.017M

Therefore , the concentration of A remain after 190minutes is 0.017M.

So mass of sucrose hydrolyzed = intial mass of sucrose -

mass of sucrose remain after 190min

= {(0.130M * 2.75L) - (0.017M * 2.75L)} (342.30g/mol)

= 106.40g

Learn more about first order reactions from the link given below.

https://brainly.com/question/1769080

#SPJ4

Answer:

I drew an amazing picture explaining everything....

Explanation:

Hope this helps! Please let me know if you need more help, or if you think my answer is incorrect. Brainliest would be MUCH appreciated. Have a great day!

−xXheyoXx

After letting the experiment run for a week, Miller and Urey found that various types of amino acids, sugars, lipids and other organic molecules had formed.

The first experimental support to Oparin-theory Haldane's of origin of life came from Urey and Miller's experiment. They conducted experiment on evolution to prove the biochemical origin of life.
Miller created a laboratory apparatus out of glass tubes and flasks in 1953. He created a hydrogen, ammonia, methane, and water vapour atmosphere in one large flask and allowed condensed liquid to accumulate in another small flask. In the large flask, the methane, ammonia, and hydrogen ratios were 2: 1: 2. The apparatus was powered by heating the liquid as well as electric sparks from tungsten electrodes in the gaseous flask. The apparatus conditions were similar to the early earth's atmosphere.

Go through the given link below to know more about Organic molecules:-

https://brainly.com/question/26556885

#SPJ4

Answer:

if i consider this reaction

Fe2O3+ 3CO---》2Fe+ 3CO2

so let's calculate first moles of Fe2O3 i.e. = 256/159.69= 1.6 moles

So the one moles of Fe2O3 is forming three moles of CO2

hence 1.6 moles will form 4.8 moles of CO2

one mole of CO2 is 44 g so 4.8 moles of Co2 is 44×4.8= 211.2 g

so the conclusion is 211.2 g of CO2 can be produced from 256 g Fe2O3!!

i d k it's right or wrong but i tried my best :)

Answer:

To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+].

Example: Find the pH of a 0.0025 M HCl solution.

Answer:

Am not so sure but I think that your ans is a

Answer:

D.

Explanation:

Because that's what every mammal has that lives on land. (Whales and dolphins are mammals)

During osmosis, water molecules move through a semipermeable membrane from an area of high concentration to an area of low concentration,

which occurs to equalize the concentration of solutes on both sides of the membrane. This process is important in maintaining the water balance in living cells. Water is the only molecule that is small enough to pass through the semipermeable membrane during osmosis, while larger molecules like proteins and glucose are generally not able to pass through. Similarly, ions, such as sodium and chloride, have an electrical charge and require specialized channels or transporters to pass through the membrane. Therefore, water is the primary molecule that is able to pass through the semipermeable membrane during osmosis.

Learn more about osmosis    here:

https://brainly.com/question/31028904

#SPJ11

Option D, NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s), is the balanced chemical equation that represents a single-replacement reaction.

What is Replacement Reaction?

In chemistry, a replacement reaction is a type of chemical reaction where one element replaces another in a compound. The general formula for a replacement reaction is:

A + BX → AX + B

where A and B are elements, and X is an anion that can combine with A and B. In this reaction, A replaces B in the compound BX, forming a new compound AX and releasing the element B as a free element. Replacement reactions can be of two types: single replacement reactions and double replacement reactions, depending on whether one or two elements are replaced in the reaction.

In this reaction, sodium (Na) replaces silver (Ag) in the compound AgNO3 to form NaNO3, and silver is released as a free element in the form of AgCl.

Learn more about Replacement Reaction from the given link

https://brainly.com/question/23918356

#SPJ9

There are 3 methyl groups and 2 ethyl groups connected to the parent chain.

Given: The bond-line structure of the compound has a nine-carbon chain, in which C 2, C 6, and C 8 are each bonded to a methyl group, C 3 and C 5 are each bonded to an ethyl group.

To find: How many of each type of alkyl substituent is connected to the parent. Bond-line structures are a shorthand representation of a molecule that uses lines to represent covalent bonds and shows each atom’s connection to the molecule. For the given bond-line structure, the parent chain contains nine carbons, and the alkyl substituents are connected as follows: C2, C6, and C8 are each bonded to a methyl group (CH3).C3 and C5 are each bonded to an ethyl group (CH2CH3).Thus, there are three methyl groups and two ethyl groups connected to the parent chain. Therefore, the answer is:There are 3 methyl groups and 2 ethyl groups connected to the parent chain.

To know more about parent chain visit:

https://brainly.com/question/28806692

#SPJ11

Hi there!

To find the mole fraction for the remaining compound (Carbon monoxide), we must remember that mole fractions add up to ONE.

We can subtract the mole fractions of all of the other gases from one to solve for the mole fraction of carbon monoxide.

1 - 0.164 - 0.278 - 0.455 - 0.101 = 0.002

It represents the time it takes for half of the material to decay to a daughter element.

The half-life of a radioisotope represent the time it takes for half of the material to decay to a daughter element (Option B)

This is the time taken for half a material to decay. The longer the half-life of an element, the more stable the element.

If the initial mass of an element is 100 g and after a particular time (say 72 minutes) the mass of the element is now 50 g.

Therefore, the time 72 minutes is called the half-life of the element because that is the time taken for half the element to decay.

With the above information in mind, we can conclude that the correct answer to the question is:

Option B. It represents the time it takes for half of the material to decay to a daughter element.

Learn more about half life:

https://brainly.com/question/26374513

Answer:

A liquid evaporated slow at higher temperature bz the vapour pressure of the is higher so few molecule can escape the surface

Answer:

The correct answer is D. A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.

Explanation:

I just got it right on Edge.

Hope this helped!

Brainliest would be greatly appreciated :D

I would say C.) It has been updated and modified based on the new data

The molar mass of the unknown compound is 35.38 g/mol.

PV = nRT

First, we need to convert the volume from mL to L:

291 mL = 0.291 L

Next, we can solve for the number of moles of the unknown compound:

n = PV/RT = (2.93 atm)(0.291 L)/(0.08206 L atm/mol K)(298 K) = 0.0145 mol

molar mass = mass/number of moles = 0.513 g/0.0145 mol = 35.38 g/mol

Molar mass is a fundamental concept in chemistry that refers to the mass of one mole of a substance. It is usually expressed in units of grams per mole (g/mol). A mole is a unit of measurement used to express the number of atoms or molecules in a substance. One mole of any substance contains Avogadro's number of particles, which is approximately 6.022 x \(10^{23\).

Molar mass is important in chemical calculations, as it allows chemists to convert between mass and moles of a substance. This is useful in determining the amount of reactants needed in a chemical reaction, or the amount of product produced. Additionally, molar mass is used in the calculation of various other important properties of a substance, such as density, specific heat, and concentration.

To know more about Molar mass refer to-

brainly.com/question/31545539

#SPJ4

Answer:

5 is the answer since they are asking for pair. And 3 pairs in the triple bond

Answer:hydrogen=1

carbon=3

total=2h+c=2×1+3=5