Which sample matter is a pure substance

Answers

Answer 1

Answer:

Explanation:

If you have options, could you please tell me so I can further help you. If you just need an example then

Examples of pure substances include iron, steel, and water

Hope this helps (:

Answer 2

Answer

These are the following answers

A) zinc oxide

B) sugar dissolved in water

C) pond water

D) soil

Explanation:


Related Questions

What is the correct order of star colors from hottest to coolest?

white, yellow, red, blue
yellow, orange, white, red
red, orange, yellow, blue-white
blue, white, yellow-white, orange

Answers

Answer: The answer is blue, white, yellow-white, orange.

Explanation: These are the two basic reasons for different star colors:

Temperature – cooler stars are red, warmer ones are orange through yellow and white. The hottest stars shine with blue light

Age – As a star ages it produces different chemicals which burn at different temperatures. We can use a star’s color to show its relative age

Answer:

OR D

Explanation:

D on edge 2020

Which pair of elements are most likely to form a molecular compound?

Nitrogen and Hydrogen

Calcium and Copper

Chlorine and Neon

Please help! I will mark brainliest if correct!

Answers

Answer: Two nonmetals.

Explanation:

Answer:The only pair of nonmetals is sulfur and fluorine.

Explanation:The pair of elements most likely to form a molecular compound with each other are two nonmetals.

Which statement best describes balancing equations and the law of conservation of mass?
O There are more atoms in the reactants than in the products, and the total mass is the same in the
reactants and in
the products
O The number of atoms is the same in the reactants and in the products, and the total mass is the same in the
reactants and in the products
O There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the
products
There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in
Toms
the products

Answers

Answer:

The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.

The statement best describes balancing equations and the law of conservation of mass is the number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products. Therefore, option B is correct.

What is the law of conservation of mass ?

According to the law of conservation of mass or principle of mass conservation, any system that is closed to all transfers of matter and energy must maintain a constant mass over time since the system's mass cannot vary and neither more nor less amount can be added or subtracted.

This law states that no matter what physical or chemical change occurs, the overall mass of the products and reactants remain identical.

Understanding and producing different chemical reactions depend heavily on this law. Researchers might anticipate how much the result would be if they knew the identities and quantities of the reactants for each reaction.

Thus, option B is correct.

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Lollll I need help with this question

Answers

Answer:

Waves are any vibration that transfers energy from place to place.

Explanation:

IM NOT SURE ABOUT THE VIBRATION BIT BUT I AM ABOUT THE ENERGY

Isotopes have
Question 1 options:

A)

different numbers of both protons and neutrons in their nuclei.

B)

a different number of neutrons in their nuclei.

C)

a different number of protons in their nuclei.

D)

a different number of electrons.
Question 2 (5 points)
An aqueous solution
Question 2 options:

A)

must contain three or more substances.

B)

is a single-phase heterogeneous mixture.

C)

has water as the solvent.

D)

has water as the solute.
Question 3 (5 points)
Which of the following is a homonuclear diatomic molecule?
Question 3 options:

A)

NH3

B)

CO

C)

2CO2

D)

H2
Question 4 (5 points)
Given a container of a solution of 5% HCl, all samples tested from this same bottle will have the same mass ratio of hydrogen to chlorine. This is an application of
Question 4 options:

A)

the law of conservation of energy.

B)

the law of multiple proportions.

C)

the law of conservation of mass.

D)

the law of constant composition.
Question 5 (5 points)
Elements in the same period
Question 5 options:

A)

have the same principal quantum number.

B)

form bonds with the same type of elements.

C)

have the same number of valence electrons.

D)

have the same number of protons.

Answers

Answer:

question 1 answer is b

Explanation:

istopes equal to same atomic number but different mass number

10. What is the change in the boiling point of water at 1000 C per Pa change under atmospheric pressure conditions? The molar enthalpy of vaporization is 40.69 kJ mol-1, the molar volume of liquid water is 0.019 x 10-3 m3 mol-1, and the molar volume of steam is 30.199 x 10-3m3 mol-1, all at 1000 C and 1.01325 bar. (Hint: change in temperature per change in pressure)

Answers

Answer:

The answer  is  [tex]\frac{dT}{dP} = 2.84*10^{-4}\ K/Pa[/tex]

Explanation:

From the question we are told that

  The boiling point of water is  [tex]T_b = 100^oC = 100 + 273 = 373 \ K[/tex]

  The enthalpy of vaporization is  [tex]\Delta H_{vap} = 40.69 \ kJ mol-1 = 40.69 *10^{3} \ J/mol[/tex]

  The molar volume of liquid water is  [tex]V =0.019 * 10^{-3} m^3 mol^{-1}[/tex]

   The molar volume of steam is  [tex]V_s = 30.199 * 10^{-3} \cddot m^3\cdot mol^{-1}[/tex]

  The pressure is  [tex]P = 1.01325 \ bar[/tex]

Gnerally from Clausius Clapeyron equation we have that

      [tex]\frac{dP}{dT} = \frac{\Delta H_{vap}}{ T * \Delta V}[/tex]

Here  [tex]\Delta V = V_s - V[/tex]

=>     [tex]\Delta V = [30.199 * 10^{-3} ] - [ 0.019 * 10^{-3}][/tex]

=>     [tex]\Delta V = [30.199 * 10^{-3} ] - [ 0.019 * 10^{-3}][/tex]      

=>     [tex]\Delta V = 0.03018 \ m^3 mol^{-1}[/tex]          

So

    [tex]\frac{dP}{dT} = \frac{40.69 *10^{3} }{ 373 * 0.03018}[/tex]

=>  [tex]\frac{dP}{dT} = 3522.28 \ Pa/K[/tex]

Generally from the we are ask to obtain the change in the boiling point of water at 1000 C per Pa change under atmospheric pressure conditions which is mathematically represented as

       [tex]\frac{d T}{dP}[/tex]

So

    [tex]\frac{dT}{dP} = \frac{1}{\frac{dP}{dT} } = \frac{1}{3522.28}[/tex]

=> [tex]\frac{dT}{dP} = \frac{1}{\frac{dP}{dT} } = 2.84*10^{-4}\ K/Pa[/tex]

Which of the following molecules has a trigonal pyramidal shape?
CO
Ni ---CO
A.
СО
OBCI-S c
Xeo
O.
O C.
0-N

Answers

Answer:

Xeo

Explanation:

A is the molecules with the trigonal pyramid shape

How many grams of F are in 225 g CaF2?

Answers

Answer:

109.575

Explanation:

TO THE F TO 225 G Caf2 iys is 1233333.9999

Which of the following is a process that changes the composition of rocks from one material to another? (3 points) a Erosion b Deposition c Physical weathering d Chemical weathering

Answers

Answer:

ERosion i think

Explanation:

Answer:  

Deposition

Explanation:

I hope you have a nice day(:

The sulfuric acid–catalyzed reaction of isopentyl alcohol with acetic acid to form isopentyl acetate is performed. This reaction does not proceed to completion. After the reaction is heated under reflux for an hour, the product mixture is washed with aqueous sodium bicarbonate solution, and the organic layer is thoroughly dried. A distillation of the organic layer is then performed. Given the boiling points listed below, select the compound that will distill first.
Compound Boiling point, ℃
acetic acid 118
isopentyl acetate 142
isopentyl alcohol 130
sulfuric acid water 290

Answers

Answer:

The correct option is acetic acid

Explanation:

Distillation is the process of separating a mixture of substances based on differences in boiling points. During distillation, the compound with the lowest/least boiling point is distilled and collected first and then the one with the next least boiling point and it goes on like that.

From the explanation above, acetic acid has the least boiling point (in the organic layer) with 118°C and thus will distill first. This is then followed by isopentyl alcohol (130°C) and then isopentyl acetate (142°C) and finally sulfuric acid water (290°C).

How do I find the hydrated formula?

Answers

Answer:

In order to determine the formula of the hydrate, [Anhydrous Solid⋅xH2O], the number of moles of water per mole of anhydrous solid (x) will be calculated by dividing the number of moles of water by the number of moles of the anhydrous solid (Equation

Explanation:

What is the volume of 26.1 g of a substance if the density of the substance is 0.28 g/mL?

Answers

Answer:

It is 93.2

Explanation:

It's that answer because if you divide volume and density that's what you get

what is the formula for zinc sulfide

Answers

Answer:

the formula for zinc sulfide is b. ZnS

Order: Vitamin K (Aquamephyton) 1 mg IM x 1 dose Newborn: Weight 4 kg Supply: 10mg/mL vial How many mLs would be given

Answers

Answer:

Volume(ml) of drug required = 0.1 ml

So, medicine is safe for this child.

Explanation:      

Given:

Desired dose (D)= 1 mg

Dose in hand (H) = 10 mg

Quantity (Q) = 1 ml

Computation:

Volume(ml) of drug = [Desired medicine / medicine in hand] Quantity.

Volume(ml) of drug required = [1/10]1

Volume(ml) of drug required = 0.1 ml

So, medicine is safe for this child.

Mass and energy are conserved
Question 16 options:

A)

only in chemical changes.

B)

in chemical changes and physical changes.

C)

always in physical changes and sometimes in chemical changes.

D)

only in physical changes.
Question 17 (5 points)
Which of the following can't be broken down any further chemically?
Question 17 options:

A)

Compounds

B)

Elements

C)

Matter

D)

Molecules
Question 18 (5 points)
A/an _______ is the smallest unit of matter that has the characteristics of a chemical element.
Question 18 options:

A)

atom

B)

proton

C)

molecule

D)

electron
Question 19 (5 points)
The distance between consecutive peaks or troughs in a wave is
Question 19 options:

A)

frequency.

B)

displacement.

C)

amplitude.

D)

wavelength.
Question 20 (5 points)
The phase transition of dry ice (frozen carbon dioxide) to gas is an example of
Question 20 options:

A)

condensation.

B)

sublimation.

C)

deposition.

D)

vaporization.

Answers

Explanation:

16 A. 17C matter 18C molecule 19D wavelength 20 C deposition

Sodium chloride can be used to preserve meat because​

Answers

Answer:

Salt is effective as a preservative because it reduces the water activity of foods. .

__Hgo > __Hg + __O2?​

Answers

How to Balance:

Hg + O2 → HgO

✅Word equation: Mercury + Oxygen gas → Mercury (II) oxide

✅ Type of Chemical Reaction: For this reaction we have a combination reaction.

✅ Balancing Strategies: To balance this equation it's probably easiest to begin by changing the coefficient in front of the HgO.

This is a combination reactions because the mercury (Hg) plus the oxygen gas (O2) come together to form the Mercury (II) oxide (MgO).

Hint-1

Hint-2

IamSugarBee

The melting and boiling points of a group of elements decrease as you go down the group, while their reactivity increases.
a.. Are the elements from the first group or the second last group of the Periodic Table?
b ..Does this group consist of metals, metalloids, non-metals or a mix?
c.. Identify two elements in this group.​

Answers

Answer:

a) first group

b) metals

c) K - potassium, Li - lithium

Explanation:

a) they are the alkali metals

b) they're alkali metals lol

c) just look at a periodic table :P

The mass of an object is 13.76 g. the volume of the object is 2.83 ml. what is the density of the object to the correct number of significant figures?

Answers

Answer:

D ≈ 4.86 g/mL

Explanation:

Density = Mass over Volume

D = m/V

Step 1: Define variables

m = 13.76 g

V = 2.83 mL

D = unknown

Step 2: Substitute and Evaluate for Density

D = 13.76 g/2.83 mL

D = 4.8621908127208480565371024734982 g/mL

Step 3: Simplify

We are given 3 sig figs.

4.8621908127208480565371024734982 g/mL ≈ 4.86 g/mL

Write the balanced chemical equation for the decomposition of sulfur trioxide to sulfur dioxide and
oxygen.

Answers

Answer:

The balanced equation is 2SO2+O2→2SO3 .

How many grams of lithium hypochlorite (LiClO) are there in 0.649 mol ?

Answers

Answer:

37.9 or 38 grmas approximately

Which of the following is true for polar jet streams?

They bring cool air.
They bring warm air.
They blow at the equator.
They blow from north to south.

Answers

Answer:

A: They bring cool air.

Explanation:

Took the test and got it correct. :)

Jet streams are fast flowing meandering air currents. Polar jet streams bring cool air through the atmosphere. Polar jets meet subtropical jets at some regions.

What are polar jet streams ?

The polar jet stream, which travels through the lower layers of the atmosphere in the Northern Hemisphere, is a swiftly moving band of westerly winds.

The confluence of warm air ascending from the tropics and cold air masses descending from the arctic produces the jet. The denser cold air lowers and deflects the warmer air areas north, creating deep troughs and steep ridges that give the jet stream its wavy appearance.

As pockets of cold air intermittently sneak down from the Arctic, this pattern spreads across the mid-latitudes of North America, Europe, and Asia, producing opposing waves and flows that speed eastward due to the earth's rotation.

Find more on jet streams:

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The state of matter of a material depends on its
O A) density
OB) temperature
O C) volume
OD) weight

Answers

Answer:

Tempature

Explanation:

Matter can move between any two states (or phases) of matter depending on the pressure and temperature conditions. ... The temperature of the melting and boiling points depend on the identity of the substance and the atmospheric pressure.

Also apex.

Answer:

temperature

Explanation:

an example here

ice

when its cold ice tends to stay as a solid but as the temperature rises the ice melts and turns into a liquid... with more heat the water will turn into gas

Isotopes have
Question 1 options:

A)

different numbers of both protons and neutrons in their nuclei.

B)

a different number of neutrons in their nuclei.

C)

a different number of protons in their nuclei.

D)

a different number of electrons.
Question 2 (5 points)
An aqueous solution
Question 2 options:

A)

must contain three or more substances.

B)

is a single-phase heterogeneous mixture.

C)

has water as the solvent.

D)

has water as the solute.
Question 3 (5 points)
Which of the following is a homonuclear diatomic molecule?
Question 3 options:

A)

NH3

B)

CO

C)

2CO2

D)

H2
Question 4 (5 points)
Given a container of a solution of 5% HCl, all samples tested from this same bottle will have the same mass ratio of hydrogen to chlorine. This is an application of
Question 4 options:

A)

the law of conservation of energy.

B)

the law of multiple proportions.

C)

the law of conservation of mass.

D)

the law of constant composition.
Question 5 (5 points)
Elements in the same period
Question 5 options:

A)

have the same principal quantum number.

B)

form bonds with the same type of elements.

C)

have the same number of valence electrons.

D)

have the same number of protons.
Question 6 (5 points)
Which of the following contribute(s) to most of the mass of an atom?
Question 6 options:

A)

Neutrons only

B)

Protons and neutrons

C)

Protons and electrons

D)

Protons only
Question 7 (5 points)
In a certain chemical reaction, the bonds of the products contain more energy than the bonds of the reactants. For the reaction to occur, which of the following best describes what occurred?
Question 7 options:

A)

Energy was released, so the reaction is endothermic.

B)

Energy was released, so the reaction is exothermic.

C)

Energy was added, so the reaction is endothermic.

D)

Energy was added, so the reaction is exothermic
Question 8 (5 points)
A solution
Question 8 options:

A)

is a single-phase homogeneous mixture.

B)

must contain water.

C)

is always a liquid.

D)

can contain more than two phases.
Question 9 (5 points)
Which of the following is true of alloys?
Question 9 options:

A)

They can only be composed of metals.

B)

They must be held together by chemical bonds.

C)

They're liquid solutions.

D)

They must contain a metal.
Question 10 (5 points)
Which of the following best describes an atomic number? An element's identity is defined by its atomic number; this means it represents the number of
Question 10 options:

A)

electrons in the element.

B)

neutrons in its nucleus.

C)

protons plus neutrons in its nucleus.

D)

protons in its nucleus.
Question 11 (5 points)
Electrons in the outermost shell of an atom that are available to bond with the electrons of other atoms are
Question 11 options:

A)

cations.

B)

free electrons.

C)

valence electrons.

D)

anions.
Question 12 (5 points)
Main group elements have valence electrons in which suborbitals?
Question 12 options:

A)

d and f

B)

s and p

C)

p and f

D)

s and d
Question 13 (5 points)
Molecules have
Question 13 options:

A)

only kinetic energy.

B)

only potential energy.

C)

both potential and kinetic energy.

D)

neither kinetic nor potential energy.
Question 14 (5 points)
The majority of elements are
Question 14 options:

A)

metalloids.

B)

nonmetals.

C)

metals.

D)

inert.
Question 15 (5 points)
A student found the mass of an object to be 26.5 g. To find the volume, the student submerged the object in a graduated cylinder of water. Submerging the object in the water in the graduated cylinder increased the water level by 24.1 mL. The density of the object is
Question 15 options:

A)

1.0906 g/mL.

B)

0.909 g/mL.

C)

1.10 g/mL.

D)

1.1 g/mL.
Question 16 (5 points)
Mass and energy are conserved
Question 16 options:

A)

only in chemical changes.

B)

in chemical changes and physical changes.

C)

always in physical changes and sometimes in chemical changes.

D)

only in physical changes.
Question 17 (5 points)
Which of the following can't be broken down any further chemically?
Question 17 options:

A)

Compounds

B)

Elements

C)

Matter

D)

Molecules
Question 18 (5 points)
A/an _______ is the smallest unit of matter that has the characteristics of a chemical element.
Question 18 options:

A)

atom

B)

proton

C)

molecule

D)

electron
Question 19 (5 points)
The distance between consecutive peaks or troughs in a wave is
Question 19 options:

A)

frequency.

B)

displacement.

C)

amplitude.

D)

wavelength.
Question 20 (5 points)
The phase transition of dry ice (frozen carbon dioxide) to gas is an example of
Question 20 options:

A)

condensation.

B)

sublimation.

C)

deposition.

D)

vaporization.

I WILL GIVE BRAINLIEST IF YOU CAN ANSWER THEM

Answers

Answer:

b

Explanation:

dueto isotopes haveno thesame neutral numbee hence b iscorrect

Answer:

b

Explanation:

how did domestication of early crops start?​

Answers

Answer:

In the Fertile Crescent in the Middle East, cereal crops were first domesticated about 11,000 years ago. Generally, the first domesticated crops were annuals with big seeds or fruits. ... Humans began to transition from a hunter-gatherer culture to a settled farming society as domestication took place.

Please mark me brainliest!

Hope this helps God bless!

A black bear can run 35.0 mph how long will it take to run 1.95 x 10^4?
A. 129
B. 0.360
C. None of the above
D. 0.106
E. 13

Answers

Answer:

The correct answer is C. None of the above.

Explanation:

To determine how long the black bear will run, the distance it will travel must first be determined. Thus, the proposed calculation must be solved.

1.95 x 10 ^ 4

1.95 x 10 x 10 x 10 x 10

19.5 x 10 x 10 x 10

195 x 10 x 10

1950 x 10

19500

Thus, the bear will run 19,500 miles, so, running at 35 mph, it will take about 557 hours to run that distance (19,500 / 35).

which gas is the most dense under standard temperature and pressure?
A. H2
B. Ne
C. Ar
D. O2

Answers

Answer:

I think it's b: ne

Explanation:

its just a wild guess

What is the molecular geometry of the atoms bonded to the carbon atom indicated with arrow I in this structure of caffeine?

Answers

Answer:

Trigonal planar

Explanation:

If we look at the carbon atom indicated I in the image, we will discover that it is a carbon atom that is bonded to a nitrogen atom via a double bond.

Recall that an sp2 hybridized carbon atom has a trigonal planar geometry. When a carbon atom is sp2 hybridized, it is in a trigonal planar geometry as we can clearly see from the image.

an atom has 79 protons, 78 electrons and a mass number of 118. how many neutrons does this atom have​

Answers

Answer:

39

Explanation:

Electrons weigh almost nothing, so their mass doesn't really matter for these types of problems. Just subtract 118-79 to find the remaining mass which is for the neutrons.

What type of bond is present between Magnesium and Fluoride in MgF2?

Answers

Answer: Ionic Bond

Explanation:

Ionic compounds are created by bonding a metal and non-metal

Mg is a metal

Fluoride is a non-metal

Other Questions
Read this excerpt from Immigrant Kids.Giuseppe and I held tightly to Stepfather's hands, while Liberta and Helvetia clung to Mother. Passengers all about us were crowding against the rail. Jabbered conversations, sharp cries, laughs and cheers -- a steadily rising din filled the air. Mothers and fathers lifted up babies so that they too could see, off to the left, the Statue of Liberty.What best paraphrases the central idea of the excerpt?It was noisy on the ship sailing to America. Immigrant parents and children made a lot of noise, especially when they got to the Statue of Liberty.Immigrant families sailing to America were excited when they finally made it to the New York harbor. Everyone on board made happy noise as they reached the United States.Everyone on board the ship was fighting to see the Statue of Liberty. Babies and mothers and fathers all cried because they couldnt see it, because it was off to the left.Immigrant children had to hold tightly to their parents hands. There was so much crowding and jostling on board the ship. If they didnt stay close to their parents, they would fall off the boat. What contribution did I make on the road to democracy? (You must add at least two contributions to the blank boxes)i need it for Solon,Cleisthenes,Pericles Which value of x satisfies the equation5/6 (3/8 - x) = 16 HELP!! PleaseWhat were three consequences of this battle? "The HorseShoe Battle" what is the mass of an atom if it has 11 protons, 12 neutrons, and 11 electrons A,22, B.23, C34, D 11 During 2017, Sheffield Company changed from FIFO to weighted-average inventory pricing. Pretax income in 2016 and 2015 (Sheffields first year of operations) under FIFO was $162,140 and $181,860, respectively. Pretax income using weighted-average pricing in the prior years would have been $153,100 in 2016 and $174,200 in 2015. In 2017, Sheffield reported pretax income (using weighted-average pricing) of $205,200. Show comparative income statements for Sheffield, beginning with "Income before income tax," as presented on the 2017 income statement. (The tax rate in all years is 25%.) How does energy change from one form to another? Which 2 body systems most directly cause the arm to bend? You are discussing earthquakes with your friends. One friend states that a magnitude 8.0 earthquake is twice as powerful as a 4.0 magnitude earthquake. Another friend states that it is actually 40 times more powerful. Another friend claims that it is 10,000 times more powerful. Which friend is more correct? Explain. If you dont keep me, Ill break. What am I?This is easy a student needs to find the density of a cube. each side of the cube measures 3 cm and the mass of the cube is 12g. what is the approximate density of the cube?A. 0.4g/cm3B. 2.25g/cm3C. 4.0g/cm3D. 36g/cm3 PLS HELP ASAP! FOR BRAINLIEST ANSWER! Please help me the picture is above Ill mark you as the brainliest but please show the work. Thank you! :) Hey brainly users just want say you can answer this question cause due IN HALF HOUR AND NEED SOMEONE HELP PLEASE I NOT LYING I FREAKING OUT!!THE TOPIC IS ABOUT THE Mahican TribeUse the spaces below to record at least three bulleted notes.Make a star next to the idea that you think best shows the complexity of the society.Make any notes that represent a characteristic that is a necessity for a society to be considered complex in RED. As part of a case study, these can then be used during the next unit to evaluate colonial societies.Background (history and settlement) of the culture group in North America:Economy:Politics:Indigenous Cultures of North AmericaResearch Project Template (continued)Social Structure (daily life):Religion:Culture (art, music, and stories): Which of the following is NOT a Transcendentalist belief?Unity between godIndividualism Knowledge comes from experience Truth in nature A line contains pointsM(1, 3) andN(5, 0). What is the slope ofMN? What is the first step to converting from a fraction to a decimal ? Jenny is a software salesperson. Her base salary is $ 1500 and she makes $50 more for every copy of English is Fun she sells. Her total pay, P (in dollars), afterselling c copies is given by the following.P = 50c+1500ooAnswer the following questions.B(a) What is Jenny's total pay if she sells 21 copies?si(b) If Jenny's total pay is $3150, how many copies did she sell?copies In a longitudinal wave, the parts where the coils are close together are called what. Using complete sentences and correct punctuation and grammar answer the following question. Must be at least 3 sentences. Explain why Eclipses do not occur every month.