If Argon has a mass number of 40 and an atomic number of 18, how many electrons does a
neutral atom contain?

A.40
B.20
C.22
D.18

Answers

Answer 1
C) 22 because the mass of a neutron is 1 amu and a proton is also 1 amu, so 40-18=22

Related Questions

Using microorganisms to break down pollutants into nontoxic organic matter is called? a. bioremediation b. phytoremediation c. biconcentration d.bioaccumulation

Answers

Answer:

bioremediation

Explanation:

If a gas has a mass of 468 grams and its density is 17 grams per liter, how much volume does it occupy?

Answers

Answer:

The answer is

27.53 Litres

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{Density} [/tex]

From the question

mass = 468 g

Density = 17 g/L

Substitute the values into the above formula and solve

We have

[tex]volume = \frac{468}{17} \\ = 27.529411[/tex]

We have the final answer as

27.53 L

Hope this helps you

Can someone help me with science

Answers

Answer:

yess...

follow me and mark me brainliest

Answer:

Yess

Explanation:

Ask your question please.

Which statement provides background knowledge that helps a reader understand the theme of valuing all life found in"Birdfoot's Grampa"?

The journey is more important than the destination.
Toads can be poisonous and may attack when startled.
Grandparents and grandchildren often disagree.
It can be dangerous to stop a car on the side of the road.

Answers

Answer:D

Explanation:

Got it right

The statement which provides the theme of valuing all life found in the poem 'Birdfoot's Grampa' is the journey is more important than the destination.

What is the theme of Birdfoot's Grampa?

The poem 'Birdfoot's Grampa' is written by the author Joseph Bruchac which narrates the story of an old man's journey to rescue the life of all toads that are seen on the road while he is driving during the night.

The poem gives us an idea that all life is important and is of value which we can understand through the immense tolerance and selflessness. The worth of our life is generally demonstrated in the poem.

Every ones life has a value whether it is small or big. This concern is shown in this poem through the character of Birdfoot's Grampa's continuous stopping of the car to rescue the toads which are seen on the road rather than just running them over.

Birdfoot's Grampa's is that much conscious and careful about the life of toads. All life is precious and the journey is more important than the destination is denoted in the poem.

Thus option A is correct - journey is more important than the destination.

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Identify how many significant figures each number has. a. 297 b. 549 c. 4678 d. 327 e. 3006 f. 902 g. 8020 h. 0.0000053 1. 0.00002 j. 0.000506 k. 4000 1. 4000.0 m. 7.12 n. 3.05​

Answers

Explanation:

a. 3 significant figures

b. 3

c. 4

d. 3

e. 4

f. 3

g. 3

h. 2

i. 1

j. 3

k. 1

l. 6

m. 3

n. 3

Did dalton’s atom have any protons, neutrons, and electrons?

Answers

Answer:

no

Explanation:

No, dalton’s atom haven't any protons, neutrons, and electrons because they were not discovered until later.

Answer:

No

Explanation:

no, because according to him an atom is a tiny indestructible sphere with mass on it. In his theory, Dolton did not know about Protons, neutrons and electrons.

The density of manganese is 7.21 g/cm^3 . What is the density in kg/m^3 ? (dimensional analysis)

Answers

Answer:

7.21 x 103 kg/m3

Explanation:

Dimensional analysis has been the process to establish and convert the various units in the measurement. The density of manganese in kg/m3 is 7.21 × 10³ kg/m³.

What is dimensional analysis?

Dimensional analysis has been the method that is also referred to as the unit factor or factor label method. It solves the mathematical expressions by multiplying the given value with another without changing its quantity and amount. It is used to change the units of the value.

Given,

Density of manganese = 7.21 g/cm³

The dimensional analysis method is used to convert grams per cubic centimeter into kilograms per cubic meter as:

1 gram / cubic centimeter = 1000 kilogram / cubic meter

So, 7.21 g/cm³ = X kilogram / cubic centimeter

Solving for X as:

X = 7.21 g/cm³ × 1000 kilogram / cubic centimeter

X = 7.21 × 10³ kg/m³

Therefore, 7.21 × 10³ kg/m³ is the density.

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Does modern industrial agriculture have a sustainable future?

Answers

Answer:

No. The aim of modern agriculture is to make a profit and be a continuing business not be sustainable to the planet. GMOs, pesticides, herbicides, monoculture, tillage, antibiotics

Explanation:

How many moles ar Li are in 9.53x^24 atoms of Li?

Answers

Answer: 15.83 mol

Explanation:

To convert from atoms to moles, we will need to use Avogadro's number.

Avogardo's number: 6.022×10²³ atoms/mol

[tex]9.53*10^{24} atoms*\frac{1mol}{6.022*10^2^3 atoms} =15.83 mol[/tex]

Now, we know that there are 15.83 moles.

google takes its name from a conversion prefix. What is it and how big is it

Answers

Answer:

Giga, 1x10⁹.

Explanation:

Hello,

In this case, if we chew over Google's name, we can see that it suggests the word Giga which in conversion units context accounts for the Giga prefix (G) which has a value of 1x10⁹.

For instance 1 meter in gigameters is:

[tex]1m*\frac{1Gm}{1x10^9m}=1x10^{-9}Gm[/tex]

Which suggests that it is a huge unit and it makes sense considering the raft of information Google handles.

Regards.

What is density????????????????

Answers

Answer:

Density is the mass per unit volume

Explanation:

Density is defined as mass divided by volume: where "p" is the density, "m" is the mass, and "V" is the volume.

I need help, pls someone help me!!

Answers

AHH I CANT READ THE THING IM SO SORRY IT WONT LOADDD
There are several chemicals that should never go down the drain. If they do, they must only go down the lab sink drain and be flushed after with water, so that there isn’t a risk of another chemical mixing with it at a later time. For chemicals that cannot be poured down the lab sink, store them in appropriate containers; plastic bottles are preferred over glass for storing hazardous waste when compatibility is not an issue.

1. How many molecules are in 2.40 moles of H2O?

Answers

Answer:

There arr 1.5*1024 molecules in 2.40 moles of H2O.

what are 5 physical changes in matter

Answers

Answer:

cutting, bending, dissolving, freezing, and boiling

Explanation:

A physical change is a change in one or more physical properties of matter without any change in chemical properties. In other words, matter doesn't change into a different substance in a physical change. Examples of physical change include but are not limited to, from solid to liquid or from liquid to gas are also physical changes.

Carmen has a sample of matter. It is clear and smells sour. The sample is also thick but it flows when poured. Which is the best conclusion about Carmen's sample?

Answers

Answer:

liquid

Explanation:

In the given context, the sample as collected by Carmen is clear  and the sample has a sour smell. It is also mentioned that the sample is thick sample and when the sample is poured on a surface it begins to flow.

Such a sample would be a liquid sample because anything that flows is a liquid. The liquid sample has a high viscosity since it is thick.

Answer:liquid

Explanation:

Because it flows

I really need help with this before 5:10
Show your work

Your big brother has been brageing about how he can bench press 4.000 grams at the gym. Sounds impressive.
but you know better. Use your skills to find how many pounds of weight he is actually pressing.

Answers

( I got you fam. )

Answer ( assuming that your brother is doing 4,000 grams and not 4 grams ) :

around 8 pound's

Explanation:

1 gram = around 0.002 gram's

4,000 x 0.002 = 8

8 pound's :-)

How many calories of heat are required to raise the temperature of 1.00kg of water from 10.2 degrees Celsius to 26.8 degrees Celsius?

Answers

Answer:

Explanation:

we know that specific heat is the amount of heat required to raise the  temperature of substance by one degree mathmeticaly

Q=mcΔT

ΔT=T2-T1

ΔT=26.8-10.2=16.6

C for water is 4.184

therefore

Q=1.00*4.184*16.6

Q=69.4 j

now we have to covert joule into calorie

1 calorie =4.2 j

x calorie=69.4 j/2

so 69.4 j =34.7 calorie thats why 34.7 calorie heat is required to raise the temperature of water from 10.2 to 26.8 degree celsius

PLEASE HELP The arrows in the chart below represent phase transitions.

Three bars are shown labeled Solid, Liquid, and Gas. They are connected by arrows labeled 1 to 6. Arrow 1 points from liquid to gas; arrow 2 from solid to liquid, arrow 3 from solid to gas, arrow 4 from gas to liquid, arrow 5 from liquid to solid, and arrow 6 from gas to solid.

Which arrows represent the phase transitions in which heat energy is gained?
1, 2, and 3
2, 3, and 5
3, 4, and 5
4, 5, and 6

Answers

1, 2, and 3

hope it helps next time upload with picture

Which of these is a physical property?
A) ability to burn a piece pf paper
B) pure sodium reacts violently with water
C) the boiling point of water is 100°C
D) helium does not tend to react with anything

Answers

Answer:

the boiling point of water is 100°C

Explanation:

Boiling point of water. It’s not physically changing the substance

Need help with this question using dimensional analysis

Answers

The speed limit would be 70.2 mi/h

Molding a shape from soft, malleable material (clay or plaster) or constructing a shape from harder material (such as metal or paper). Molding is what a child does with Play-Doh or origami.

Answers

Complete question is;

Molding a shape from soft, malleable material (clay or plaster) or constructing a shape from harder material (such as metal or paper) is called what?

Molding is what a child does with Play-Doh or origami

Answer:

Modeling

Explanation:

In chemistry, we have a branch called modeling chemistry. In modeling, we organize together a series of models instead of a collection of topics. In this approach, we will begin with a phenomena that can be readily observed and are gradually develop the simplest model of matter that helps us make sense of our observations.

Now in the question, we are Molding a shape from soft, malleable materials like clay/plaster or constructing from harder materials like metal/paper. This means that we are organizing a series of models from either soft & malleable or harder materials to produce a simple model shape.

Thus, this is simply modeling.

An atom has a mass number of 19 and an atomic number of 9. What element is it? What is it’s symbol? How many protons, neutrons and electrons does it have? PLEASE HELP NEED ANSWER ASAP

Answers

Answer:

9 protons 9 electrons and 10 neutron

Explanation:

The atomic number is the number of protons .In a neutral atom,the number of electrons equals the number of protons.Mass number is the sum of the protons and nuetrons of a particular isotope.If you have mass number and atomic number,subtract the atomic number from the mass number to get the number of nuetrons. Mass number- atomic number= number of nuetrons

Which condition might develop if people eat contaminated raw or undercooked fish?
A. Cyclosporiasis
O B. Cryptosporidiosis
C. Giardiasis
O D. Anisakiasis

Answers

the correct answer is Anosamiasis
O B. Anisakiasis, you get it from eating undercooked or raw fish

Why carbon dioxide can be tested with the help of moist blue litmus paper ?

Answers

Answer:

carbon dioxide is acidic and when it comes in contact with blue litmus paper it turns red

Explanation:

Describe, in terms of particle arrangement, why the substance with the smallest density and the substance with the largest density has different densities.

Answers

Explanation:

Density of a substance may be defined as the amount of mass or matter it contains in a unit space or volume of that substance. It is the quantity of the matter that a body possess or contains.

Mathematically,

density = mass / volume

Different substance shave different densities. The arrangement of molecules or atom particles in the substances makes a substance less denser or more denser than the other substance.

In liquid or gas, the molecules are loosely bound to each other and there are more empty space or void spaces in the substance. Thus this make liquid and gas less dense.

On the other hand, the molecules in solid are tightly bound and they are packed, with no or very less empty space. Therefore, solids have the largest density than the gases which have the smallest density.

9. How many grams of zinc are needed to produce 12 grams of zinc chloride according to the following equation? Y-
Zn + Cl2 --> ZnCl2
12 grams of zinc
O 2.9 grams of zinc
O 11.6 grams of zinc
O 5.8 grams of zinc

Answers

Given :

A balanced chemical equation :

[tex]Zn +Cl_2->ZnCl_2[/tex]

To Find :

How many grams of zinc are needed to produce 12 grams of zinc chloride.

Solution :

Moles of [tex]ZnCl_2[/tex] ,

[tex]n=\dfrac{Given \ wt}{Molecular\ Mass}\\\\n =\dfrac{12}{136.30}\ mol\\\\n=0.088\ mol[/tex]

Now, by balanced chemical equation we can say that 1 mol of Zn produce

1 mol of [tex]ZnCl_2[/tex] .

So, 0.088 mol of Zn is required to produced 0.088 mol of [tex]ZnCl_2[/tex] .

[tex]Mass \ required = molecular \ mass \times moles\\\\m = 65.38 \times 0.088\\\\m=5.8 \ gm[/tex]

Therefore, 5.8 grams of zinc is required.

Hence, this is the required solution.

Calculate the volume of a sample of iron that has a density of 6.8 g/mL and a mass of 6780 mg.

Answers

Answer:

m= 6780mg = 6.78g = 6.8g

d= 6.8g/ml

V= m/d

V= 1ml

400 cm^3 =
L (Given: 1 cm^3 = 1 mL)

Answers

Answer:

1 cm^3 = 1 mL

Then

400 cm^3 = 400mL

Now convert mL to L

400/1000

0.4liter


What makes one atom different from another? The number of______in the_____

Answers

Answer:

protons in the nucleus

Which are different forms of an element that have different numbers of neutrons?
O ions
O isotopes
O compounds
O molecules

I need help pleaseeee

Answers

When an element has a different number of neutrons, it’s called an isotope.
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