Which of the following substances is an element? A. water B. table salt C. iron oxide D. hydrogen

Answers

Answer 1
D. Hydrogen

an element is a pure substance that cannot be broken down
Answer 2

Answer:

[tex]\boxed {\tt D. \ Hydrogen}[/tex]

Explanation:

An element has a uniform composition, cannot be broken down by chemical change, every atom has the same atomic number, and can be found on the Periodic Table.

Water is made of hydrogen and oxygen atoms (H₂O) so it is not an element.

Table salt is made of sodium and chloride atoms (NaCl) so it is not an element.

Iron oxide is made up of iron and oxygen atoms, so it is not an element.

Hydrogen is an element. It can be found on the Periodic Table as element H.

The correct answer is D. Hydrogen


Related Questions

Do you believe that in 2020 every single American, regardless of race, sex, or income level, has an equal opportunity to achieve his/her American Dream? Why or why not?

Answers

Answer:

Tbh i rlly dont think that many will.  Most may succeed  in doing so. But i mean come on its 2020 anything can happen.

Explanation:

Answer:

yes 100% what reasons r there to not tho

Explanation:

Find the mass of an object that has a density of 1.5g/cm^3 and has a volume of 8cm^3 power

Answers

Answer:

The answer is 12 g

Explanation:

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

mass = Density × volume

From the question

volume = 8 cm³

density = 1.5 g/cm³

We have

mass = 8 × 1.5

We have the final answer as

12 g

Hope this helps you

Question 4 (4 points)
Special bonds formed because of electrostatic interaction between molecules are called

A.intermolecular forces
B. intramolecular forces
C.permanent forces
D.magnetic forces

Answers

Answer:

A. intermolecular forces.

Intermolecular force hope it helps

What satement is true the about atomic mass?

Answers

Answer:

Explanation:

A. It can be greater than the atomic number

Which of the following is the end product of a natural
radioactive series?

Answers

Answer:

Lead

Explanation:

Lead (Pb) is the end product of every natural radioactive series.

11) Identify the number of elements and the number of atoms present in the chemical formula. NaHCO ²
4; 6
5; 6
4,5
3; 5​

Answers

Answer:

4;6

Explanation:

because there are four elements

the answer will be .. A . 4;6

tectonic plates move to ​

Answers

Answer:

I don't really understand, but here is my answer:

Tectonics plates can move back and forth, side to side, and into each other which causes earthquakes.

Hope this helps!

Sky

When Tectonic plates move it’s causes earthquakes and can trigger tsunamis


Which of the following pairs of elements belong to the same period?

Answers

Answer:

He and Ar

Explanation:

What is the process by which new oceanic crust is added?
A Seafloor Spreading
B) Earthquakes
C) Trenches
D) Plate Tectonics

Answers

Answer: A

Explanation:

Answer:

A.Seafloor spreading

Explanation:

FUDQPITJ8PXzpl6qZcrfQD6A/viewform?hr_submission=chklyut_jwBE
Potassium (K) is a soft, silver, solid metal. It is widely found in food we eat.
11
Na
22.990
Sodium
19
K
39.098
Potassium
37
Rb
85.488
Rubidium
Which statement correctly and accurately describes atoms of Rubidium?

Answers

Answer:

What is all that stuff

Explanation:

Science Graded Assignment Help. Extra points! Due by: 29th of October

Answers

1. Cells are the basic unit of all living things
2. An organ is a group of several tissues working together while an organ system is a group of Organs that work together to perform functions
3. Your organ system works at a level that keeps you body functioning constantly.ex respiratory system, circulatory system work together to provide oxygen
4. I’m sorry but I don’t know this one :(
5. When the balance your organ system creates stops working, your health as a whole will suffer.

3. Except for the bolt, note the difference between the calculated volumes and the volume
found by the displacement method. Which method is more accurate? Why?

Answers

Answer:

Yes Because the calculated volume is more accurate because you are able to measure the smaller dimensions.

~Apex lab

The metric unit of force is the Newton (N) , which is kg⋅m/s2 .
Convert 10 kg⋅cm/s2 to Newtons.

OPTIONS:
A. 1×10−1 N
B. 1×10−2 N
C. 1×10−5 N
D. 1×10−6 N

Answers

Answer:

1×10^-1 N

I took the quiz

Answer:

A

Explanation:

I just took the test.

How do homes lose thermal energy?
I need TWO reasons on why we want to reduce the thermal loose.​

Answers

Answer:

Poorly insulated attics, windows not being insulated in the winter

Explanation:

One reason is so we do not get cold in the winter and the reason we have a home is to protect us from the weather or put a shelter above us. Second reason is so we don't get hypothermia in the winter time.

Which best explains why making a pancake from batter is an example of a chemical change?

The pancake that forms is a different state of matter.
The change from batter to pancake can be reversed.
A new substance forms when the batter is cooked.
The batter changes shape when it is cooked.

Answers

Answer:

the correct answer is C. A new substance forms when the batter is cooked

Explanation:

I got it right on edge 2021. Hope this helps

You are a high school track & field coach and you have a young female athlete who is running a competitive mile pace (5:20). This would make her competitive at the state and national level. You want to help this athlete to maintain and even increase her competitive potential. What would you do?

Answers

Answer:

By ensuring she is giving speed endurance training

Explanation:

Speed endurance training would be the most ideal in helping an athlete to maintain and even increase her competitive potential.

The speed endurance training would help the athlete maintain and attain a high speed for a longer duration of time.

This would make the athlete get used to running an improved time for much longer distances.

Define Each Piece of the Microscope


Describe What Each Microscope Lens Does



Describe How The Microscope Magnification Lens Works

Answers

1) Body tube (Head): The body tube connects the eyepiece to the objective lenses. Arm: The arm connects the body tube to the base of the microscope. Coarse adjustment: Brings the specimen into general focus. Fine adjustment: Fine tunes the focus and increases the detail of the specimen.

2)Microscopes are made up of lenses for magnification, each with their own magnification powers. Depending on the type of lens, it will magnify the specimen according to its focal strength.

3)In simple magnification, light from an object passes through a biconvex lens and is bent (refracted) towards your eye. ... The eyepiece lens usually magnifies 10x, and a typical objective lens magnifies 40x. (Microscopes usually come with a set of objective lenses that can be interchanged to vary the magnification.)

HELPP PLEASE
Isotopes have different number of........... *

Protons
Electrons
Neutrons
Protons and Neutrons

Answers

Answer:

neutrons. they have the number of protons and electrons

Neutrons because neutrons are neutral so this means the element doesn’t change

AgF (aq) + KNO3 (aq) →

Answers

Answer:

AgF (aq) + KNO₃ (aq) → AgNO₃(aq) + KF(aq)

Explanation:

AgF (aq) + KNO₃ (aq) →

The products from the equation above can be obtained as follow:

1. AgF and KNO₃ will dissociate in solution as shown below:

AgF (aq) —> Ag⁺(aq) + F¯(aq)

KNO₃ (aq) → K⁺(aq) + NO₃¯(aq)

2. A double displacement reaction will occur between AgF and KNO₃ as illustrated below:

AgF (aq) + KNO₃ (aq) →

Ag⁺(aq) + F¯(aq) + K⁺(aq) + NO₃¯(aq) → Ag⁺NO₃¯(aq) + K⁺F¯(aq)

AgF (aq) + KNO₃ (aq) → AgNO₃(aq) + KF(aq)

A careful observation of the above equation shows that the equation is balanced.

HELP ASAP
Which of the following is NOT a factor in conduction?
A. Temperature difference
B. Fluid flow
C. Surface Contact
D. Cross sectional area

Answers

B:Fluid Flow because fluid flow is how convection heat is transfered

What happens if an organism cannot carry out its life function?

Answers

Answer:

organisms cannot stay with out getting nutrients as they will not be able to repair them selves or produce energy.

Explanation:

A. How many molecules of sugar are in 20.5 g of sugar?

Answers

Answer:

By definition, one mole (one gram molecular weight) of any substance, contains Avogadro’s number of particles; atoms if you are discussing an element, or molecules if a compound. Avogadro’s number has been determined by several methods, all of the accepted values lie within a range of +-1% about the value of 6.022045 x 10^23/gm. That is a large number, in this case approximately; 602,204,500,000,000,000,000,000 molecules of glucose.

1M is 1M 1M is 1M 1M is 1M 1M is 1M

What is a hypothesis?
O proof and evidence of a scientific fact
O a question about nature and how it works
a series of steps to carry out an experiment
O a possible explanation of or answer to a scientific question

Answers

Answer:

The 4th option

a possible explanation of or answer to a scientific question

Explanation:

Answer:

A hypothesis is a question about naturre and how it works

Match the vocabulary words with the correct definitions.
1.
equation
domain
3.
the variable representing the second elements of the
ordered pairs in a function; the outputs
2. the independent value, or x value
a relation where for any given input value there is only one
output value
the variable representing the first elements of the ordered
4.
pairs in a function; the inputs
a mathematical statement that shows two expressions are
5.
equal; has an equal sign
dependent variable
independent variable
function

Answers

Answer:

5 and 2 I think.

Explanation:

[tex]\\ \\[/tex]HOPE THIS HELPS!!

Answer:

i just wanted to say that the other person really did not help

Explanation:

Autism is a disability that results from a disorder in the central nervous system. It has been speculated that the increasing number of cases of autism in recent years is due to the increase in the number of vaccinations given to young children. What might be another possible explanation for this phenomenon?

Answers

Answer:

Explanation:

As described in the question, autism is a disability that arises from a disorder in the central nervous system which is actually characterized by abnormality in the brain structure and then function. Autism is known for symptoms such as challenges with communication and interaction and some obsessive behaviors. While there is generally no known scientific cause for autism but trends have suggested that vaccination in young children causes autism.

However, genes could also be involved in this phenomenon because there have been reports of unusual genetic sequence in children that have autism. Hence, there is a possibility that vaccination actually triggers this genetic sequence which is then expressed as autism in the children.

Please note this isn't a scientific fact and just a possibility as requested in the question.

A 2.3 kg object has 15 ) of kinetic energy. Calculate its speed.
O A. 0.12 m/s
OB. 1.1 m/s
O c. 2.4 m/s
OD. 3.6 m/s

Answers

Answer:

The answer is option D

Explanation:

To find the speed given the kinetic energy and mass we use the formula

[tex]v = \sqrt{ \frac{2KE}{m} } \\ [/tex]

where

m is the mass

v is the speed

From the question

KE = 15 J

m = 2.3 kg

We have

[tex]v = \sqrt{ \frac{2 \times 15}{2.3} } = \sqrt{ \frac{30}{2.3} } \\ = 3.61157559...[/tex]

We have the final answer as

3.6 m/s

Hope this helps you

How many atoks are in each element sampke? 16.5 g Sr, 26.5 g Fe, 7.73 g Bi, 36.4 g P​

Answers

Answer:

16.5gm of Sr(strontium) has 1.12 x10^23 atoms...26.5 gm of Fe(iron) has 2.84 x10^23.... 7.73 gm of Bismuth has 2.22 x10^22.....36.4gm of  Phosphorus has 7.06 x10^23

Explanation:

by the formula,

                          Moles=[tex]\frac{no of atoms}{Avogadro's No}[/tex]

you could find moles by

                                      Moles = given mass/atomic mass

Put the value of moles and multiply it by Avogadro's no you will get the following answers

fghgfgfgfftftftft ttcc

Answers

Answer:

fghgfgfgftftftftftft ttcc

tehee

Explanation:

A. Lithium and cadmium are in the mixture. Strontium is not in the mixture.B. Lithium and strontium are in the mixture. Cadmium is not in the mixture.C. Cadmium and strontium are in the mixture. Lithium is not in the mixture.D. All of the shown elements are present in the mixture.

Answers

Answer:

I think it's Sr and Li...

Explanation:

You just line up the elements to the mixture and whatever fits with all of the charts are the elements present in the mixture.

how many atoms does Mg(NO3)2 have thanks

Answers

Answer: Magnesium nitrate compound contains one atom for magnesium, two atoms for nitrogen, and six atoms for oxygen.

CREDIT safsaf

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WILL GIVE BRAINLIEST TO FIRST CORRECT ANSWER!Sandra deposits $3,000 at the end of each semiannual period for 12 years at 10% interest compounded semiannually. Determine the amount she will have in the account after 12 years. Round to the nearest cent.a. $133,506.00b. $140,181.30c. $121,291.43d. $70,568.14 What is 20 mulitpyed by 50 I need help please with this question ?????!!! If neither a nor bare equal to zero, which answer most accurately describes the product of (a + b)(a - b)? From who did Muhammad learn about Christianity Name this rest: Upside down top hat shape. eighth rest quarter rest half rest whole rest (1 + 3x) (x 13) Find the x-intercept of 2x - 3y = 6 answer my question plz im really stuck on it plz! Explain how filing your tax return online can make payments easier. Which geographical region is located right in the middle of African continent Please help Ill give you brainiest! What is the equation of the line that passes through the point (-3,6) and has a slope of -2? 3. A serving of a frozen casserole is 1/6 of a pan. If Vicky eats 1/7 of the pan, what fraction of a serving has Vicky eaten? Vicky has eaten of a serving (Type an integer or a simplified fraction.) what are Newton's 3 laws Which point is located on the line represented bythe equation y = 5x + 4? If a cube has an edge length of 0.843 cm what is the volume of the cube? (Answer should be 3 decimal places) Use this map to answer the following question.Which letter correctly labels the area claimed bythe French as of 1682?C 5x 3(x 6) = i dont know what to do Passage 2: Excerpt from School Bus Ads Bring Needed Revenue to Area Districts18 School buses are carrying more than students these days.19 The vehicles sport fancy advertisements for local businesses and events.20 It's part of the effort for school districts to make money in these budget-strapped times.21 And it is paying off.22 Lewis-Palmer School District 38 made about $8,000 in its first effort last year with eight advertisers and 11 buses. This year, it is expanding.23 "Ultimately we hope to have advertisements on every bus to maximize our income," said Robin Adair, D-38 spokeswoman. The district, which has had $11 million in cuts in recent years, is seeking a $4.5 tax increase in the November election.24 D-38 has 56 buses that collectively travel more than a half million miles a year. That could be a lot of bang for the advertising buck, and a nice amount of change for district coffers. Like Lewis-Palmer, most districts that allow advertising on their buses choose to put the money in general funds to help with such things as higher fuel and utility expenses and increased contributions to pension funds and student activities.25 Other Pikes Peak districts that use their buses as rolling billboards are Colorado Springs School District 11 and Falcon School District 49.26 Some of the advertisements on Lewis-Palmer buses include dentists, restaurants, insurance agents, a gymnasium, PTA's and the district's own programs.27 A.B. Tellez, owner of Rosie's Diner in Monument, said he signed up for two buses, one middle school that features kid's meals and shakes, and an elementary bus that features, of course, chicken nuggets. "Those buses drive everywhere. It's awesome marketing. But there is more to it than that. It's being part of the community, helping out the schools. They need funds. I thought it was neat to use dollars to support the community as well as the community supporting us."28 The districts report that the ads are approved by administrators before they are placed on the buses. There are none inside the buses to entice kids. The products must be child friendly -- no alcohol, tobacco, gaming or distasteful subjects. They don't usually allow advertising from other schools that might compete with them for students.29 Colorado in 1997 was the first state to allow school-bus advertising.(the question)Which quote from Passage 2 provides evidence that many school districts are dealing with budgetary concerns?A)"Lewis-Palmer School District 38 made about $8,000 in its first effort last year with eight advertisers and 11 buses." (paragraph 22)B)That could be a lot of bang for the advertising buck, and a nice amount of change for district coffers. (paragraph 24)C)Like Lewis-Palmer, most districts that allow advertising on their buses choose to put the money in general funds to help with such things as higher fuel and utility expenses (paragraph 24)D)Some of the advertisements on Lewis-Palmer buses include dentists, restaurants, insurance agents, a gymnasium, PTAs and the district's own programs. (paragraph 26)