Plz help me with this question

Plz Help Me With This Question

Answers

Answer 1
The correct answer C

Related Questions

How much less carbon does
natural gas release than
coal?

Answers

Answer:

natural gas releases 50 to 60 percent less carbon dioxide than coal

Explanation:

Natural gas is a fossil fuel, though the global warming emissions from its combustion are much lower than those from coal or oil. Natural gas emits 50 to 60 percent less carbon dioxide (CO2) when combusted in a new, efficient natural gas power plant compared with emissions from a typical new coal plant [1].

2 Points
You are a forensic scientist working for a police department. One piece
of evidence from your current case is a letter written in a strange ink. You
must separate the pigments in the ink to determine what it is made from.
What procedure should you use?
A. Distillation
O
B. Evaporation
C. Filtering
d
d
D. Chromatography
Reset Selection

Answers

The answer is D. Chromatography

Do you is the correct answer because chromatography refers to the science of splitting mixtures to identify what they’re made of. I hope this helps.

2
3
4
5
6
What did Virchow observe that led him to determine one of the main components of cell theory?

Answers

Answer:

In the year 1850, Rudolf Virchow was studying cells under a microscope, when he observed that cells were dividing and forming new cells. Realizing what he had observed, he understood that living cells reproduce new cells through division

What is the name of the body part that passes messages
from the sensory neurons to the brain?
o Lungs
O Nerve Cells
o Brain
o Stimulus please help me thanks

Answers

The answer would be nerve cells. Hope that helps you!

In The diagram which part is negatively charged?

• solid Cu

• wire

• salt bridge

• solid Zn

Answers

Answer:

Solid Zn

Explanation:

I took the test :-)

In the diagram solid Zn is negatively charged.

When is solid Zn is negatively charged?

Zinc is known as a element that acts as a negative electrode based on the fact that it has more negative potential and acts as the anode.

Based on the fact that zinc is a metal, it is known to often forms metallic compounds with other kinds of metals and based on the fact that it also has an ion charge of +2, the zinc ions are referred to as a strong reducing agents and thus do form ionic bonds.

Learn more about negative charge from

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The atomic number of an atom is
a) The mass of the atom
b) The number of protons added to the number of neutrons
c) The number of protons
d) Negatively charged

Answers

Answer:

b, the number of protons added to the number of neutrons

Explanation:


Balance the combustion reaction between octane and oxygen.

2C ₈ H ₁₈ + O ₂ → CO ₂ + H ₂ O

Answers

Answer:

The answer is 2C8H18 + 25O2 16CO2 + 18H2O .

(Correct me if I am wrong)

Let's say you added too much magnesium in the amount of 0.1594 g. How much 8.00 M HCl (in mL) would be required to decompose the excess Mg present?
Mg(s) + 2 HCl(aq) --> MgCl2(aq) + H2(g)

Answers

Answer:

1.65×10^-3 L or 1.65 mL

Explanation:

Number of moles of magnesium in the excess reagent= mass of excess reagent/ molar mass of magnesium

Mass of excess magnesium= 0.1594 g

Molar mass of magnesium= 24 gmol-1

Number of moles of magnesium= 0.1594/24 = 6.6×10^-3 moles

From the reaction equation;

1 mole of magnesium reacted with 2 moles of HCl

6.6×10^-3 moles of magnesium will react with 6.6×10^-3 moles × 2= 13.2×10^-3 moles of HCl

But we know that;

Number of moles of HCl= concentration of HCl × volume of HCl

Volume of HCl= number of moles of HCl/ concentration of HCl

Since concentration of HCl= 8.00M

Volume of HCl= 13.2×10^-3/8.00= 1.65×10^-3 L or 1.65 mL

The type of radioactive decay in which the mass number and atomic number remain unchanged is (2 points) Select one: a. beta radiation. b. alpha radiation. c. positron radiation. d. gamma radiation.

Answers

Answer:

d.

Explanation:

a. beta radiation - electrons that have negative charge, and when they leave a nucleus , the charge or atomic number of the nucleus will change.

b. Alpha radiation - nuclei of He, atomic number and mass number will be changed.

c. positron radiation - positrons are similar to electrons but have positive charge, so , the charge or atomic number of the nucleus will change.

d. gamma radiation is electromagnetic waves, does not have charge and mass.

Answer:

the answer is d. gamma radiation

Explanation:

Match each element to its electron dot diagram. The symbol X represents the element. Refer to the periodic table if needed. fluorine sodium phosphorus magnesium One of the X's didn't work, but it had 2 dots on top, 2 on the right, 2 on the bottom, and 1 on the left.

Answers

Answer:

The atom with one outer most electron is sodium

The atom with two outermost electrons is magnesium

The atom with five outermost electrons is phosphorus

Explanation:

A dot structure of an atom shows the number of electrons present on the outermost shell of that atom. In order words, a dot structure shows the valence electrons present on the valence shell of an atom.

Sodium has an atomic number of 11, hence the electrons are arranged in three shells in the following order 2,8,1. This implies that one electron is present on it's outermost shell.

Magnesium has an atomic number of 12. Its electrons are arranged in shells in the order; 2,8,2. Hence, two electrons are present in its outermost shell.

Phosphorus contains 15 electrons(atomic number of 15), these electrons are arranged in shells in the order 2,8,5. Hence there are five outermost electrons present in phosphorus.

Answer:

1 dot sodium

2 dots Magnesium

7 dot Fluorine

5 dot Phosphorus

Explanation:

As much sugar as will dissolve is added to hot water. The water is then
cooled, and all of the sugar remains dissolved in the solution. Which term
describes the final sugar solution?
O A. Nonsaturated
O B. Saturated
C. Unsaturated
O D. Supersaturated

Answers

The answer is C because it says describe the final sugar and C is unsaturated and in the problem it says as much as sugar will dissovle .

A 390 mL solutions of 4.6 M HCl is left out over the weekend and 74 mL of solvent evaporates. What is the new concentration of HCl?

Answers

Answer:

5.7 M

Explanation:

You have .390 L of 4.6 M HCl.

.390 L * 4.6 mol/L = 1.794 mol HCl

.390-.074=.316 L solvent remaining

1.794 mol/.316 L=5.7 M HCl

plz help i need the answer ASAP If 6.20 cm3 of a 6.75 M (M = mol/dm3) solution are diluted to 85.6 cm3 with water, what is the concentration of the final solution?

A. 6.75 (6.20/85.6)

B. 6.75 (8.56/6.20)

C. 6.75 (6200/85.6)

D. 6.75 (85.6/6200)

a) A
b) B
c) C
d) D

Answers

Answer:

Option A. 6.75 (6.20/85.6)

Explanation:

The following data were obtained from the question:

Initial volume (V1) = 6.2cm³

Initial concentration (C1) = 6.75M

Final volume (V2) = 85.6cm³

Final concentration (C2) =.?

The final concentration can be obtained by using the dilution formula as show below:

C1V1 = C2V2

6.75 x 6.2 = C2 x 85.6

Divide both side by 85.6

C2 = (6.75 x 6.2) /85.6

C2 = 6.75 (6.2 / 85.6).

In the photoelectric effect, what happens when light hits the metal?
A. Electrons are knocked off atoms, causing electricity to flow.
B. Electricity is produced in the metal, causing light to be emitted.
C. Light is reflected off the metal, causing electrons to form.
D. Electrons are pumped into the metal, causing electricity to flow.

Answers

Answer: A. Electrons are knocked off atoms, causing electricity to flow.

Explanation:

Photoelectric effect is defined as emission or ejection of electrons from the surface of a metal when a light of certain frequency falls on the surface of the metal. Electrons emitted in this effect can be called photoelectrons.

The light which falls on the surface of the metal must be of sufficiently high frequency called as threshold frequency.

Thus light knocks off the electrons and thus the flow of electrons will result in the production of electricity.

Thus the correct option is Electrons are knocked off atoms, causing electricity to flow.

Choose the correct coefficients to balance the following equation: __CaCO3 + __HC; Produces __CaCl2 + __CO2 + __H2O

Answers

Answer:

CaCO3 + 2HCl = CaCl2 + CO2 + H2O

Explanation:

CaCO3 + HCl = CaCl2 + CO2 + H2O

Error in equation should be HCl on left hand side not HC

Left Side

Ca = 1

C = 1

O = 3

H = 1

Cl = 1

Right Side

Ca = 1

C = 1

O = 3

H = 2

Cl = 2

So we'll try and balance the Chlorine

CaCO3 + 2HCl = CaCl2 + CO2 + H2O

Left Side

Ca = 1

C = 1

O = 3

H = 2

Cl = 2

Right Side

Ca = 1

C = 1

O = 3

H = 2

Cl = 2

Yay it worked

A skeleton chemical equation includes which of the following

Answers

Answer:

Explanation:

Skeleton equations are also known as unbalanced equations.

Eg I react Oxygen, Hydrogen and Chlorine and I get Water and Chlorine Gas

H2 + Cl2 = HCl

Left Side

H = 2

Cl = 2

Right Side

H = 1

Cl = 1

As you can see it's not balanced is skeleton equation.

Subtract to find the temperature changes
for the water and the metal.
AT (water) =
AT (metal) =


Answers

Answer:

Explanation:

The temperature changes for the water and the metal is

ΔT (water) = 4.7°C

ΔT (metal) = - 72.9°C

Specific Heat

The quantity or amount of heat per unit mass required to raise the temperature of a body by one degree Celsius is known as specific heat. The unit of specific heat are joules or calories per gram per degree Celsius. Specific heat is an intensive property.

Calculate the temperature changes

Relationship between temperature and heat is expressed as:

Q = mcΔT

where,

Q is heat energy in Joules (J)

m is mass (in grams)

c is specific heat in J/g°C

ΔT is change in temperature

Now calculate the temperature changes for the water

ΔT (water) = T(final) - T(initial)

                 = 27.1 - 22.4

                 = 4.7°C

Now calculate the temperature changes for the metal

ΔT(metal) = T(final) - T(initial)

                = 27.1 - 100

                = -72.9°C

Thus, from the above calculation we can see that the temperature changes for the water and the metal is

ΔT (water) = 4.7°C

ΔT (metal) = - 72.9°C

Learn more about the specific heat here: https://brainly.com/question/21406849

#SPJ2                

One million argon atoms is how many mol of argon atoms? (2 significant figures)

Answers

Answer:

1.66 * 10^-18 mol of Argon

Explanation:

Avogadro says 1 mol of anything has 6.022* 10^23 atoms/particles. Thus using this principle, 1 million argon atoms will have

[tex]1,000,000 atoms Argon * \frac{1mol Argon}{6.022*10^{23} atoms }[/tex]

[tex]1.66*10^{-18} mol \\\\ of Argon[/tex]

One million argon atoms is equivalent to 1.7 × 10⁻¹⁸ moles of argon atoms.

To convert one million (10⁶) argon atoms to moles of argon atoms, we will use Avogadro's number: there are 6.02 × 10²³ argon atoms in 1 mole of argon atoms.

[tex]10^{6} atom \times \frac{1 mol}{6.02 \times 10^{23}atom } = 1.7 \times 10^{-18} mol[/tex]

One million argon atoms is equivalent to 1.7 × 10⁻¹⁸ moles of argon atoms.

You can learn more about Avogadro's number here: https://brainly.com/question/13302703

PLEASE HELP ME ASAP Explain why each of these elements occurs as diatomic molecules. Match the words in the left column to the appropriate blanks in the sentences on the right.

Answers

Answer:

The answer to your question is given below

Explanation:

1. When two hydrogen atoms pair together, they form a single bond to achieve complete duet.

Hydrogen atom has 1 shell and 1 valence electron and they contribute it to form bond, thereby obtaining a stable duet configuration

H + H —> H–H —> H2

2. When two halogen atom pair together, they form a single bond to achieve a complete octet which is stable. For example, Cl has 7 electrons in its outermost shell and need 1 more electron to complete it octet. Each Cl will contribute 1 electron each to form a single bond..

Cl + Cl —> Cl–Cl —>Cl2

3. When two oxygen atoms pair together, they form double bond to achieve a complete octet which is a stable configuration.

Oxygen has 6 electrons in its outermost shell and needs 2 more electrons to complete its octet configuration. Each oxygen atom will contribute 2 electrons each to form a double in order to complete it octet configuration.

O + O —> O=O —>O2

4. When two nitrogen atom pair together, they form a triple bond to achieve a complete octet which is stable. Nitrogen has 5 electrons in its outermost shell and needs 3 more electrons to complete it octet configuration. Each nitrogen atom will contribute 3 electrons each to form a triple bond in order to complete its octet configuration.

N + N —> N≡N —> N2.

The explanation as to why each of the elements occurs as diatomic molecules is as follows;

When two hydrogen atoms pair together, they form a single bond to achieve complete duet.

Hydrogen atom has only the 1 shell and 1 valence electron and an Hydrogen molecule is formed when the duet is achieved.

H + H —> H–H —> H2

When two halogen like Chlorine, Cl (each with a valency of 7) atoms yields a single bond to achieve a complete octet which is stable. Each Cl will contribute 1 electron each to form a single bond..

Cl + Cl —> Cl–Cl —>Cl2

Upon bonding of two oxygen atoms, a double bond is formed to achieve a complete octet which is a stable configuration.

Oxygen has a valency of 6 and needs 2 more electrons to complete its octet configuration. Each oxygen atom will contribute 2 electrons each to form a double in order to complete it octet configuration.

O + O —> O=O —>O2

When two nitrogen atom pair together, they form a triple bond to achieve a complete octet which is stable.

Nitrogen has a valency of 5 and needs 3 more electrons to assume an octet configuration. Each nitrogen atom will contribute 3 electrons each to form a triple bond in order to complete its octet configuration.

N + N —> N≡N —> N2.

Read more;

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What happens at the particle level during a chemical reaction?

Answers

Answer:

Reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.RT

Explanation:

10 Points
Atoms are very small. Approximately how many atoms would it take to
make a stack as thick as a potato chip?
O
A. Thousands
O
B. Hundreds
C. Billions
OD. Millions
Reset Selection

Answers

Answer:

C. Billions

Explanation:

or even more

Use the balanced equation below to answer the question that follows
6 CO2 + 6H2O - CH206 +60,
How many moles of water are needed to produce 4 moles of CH420?-
a.4
b. 6
c. 10
d. 24

Answers

The answer will be C

please help me!!!!!!!! if the temperature of your ice is 32 percent Fahrenheit and your water is 68 Fahrenheit and you mixed the ice and the water together what temperature is your water?

Answers

Answer:

36 degrees farenheit

How many hours will it take for only 1.5625 mg to remain

Answers

Answer:

36 hours

Explanation:

Notice that you are given the actual table of how the isotope reduces , and it shows that for each period of 6 hours the isotope decays to half of the initial number.

EVery 6 hours, the reduction in number of mg of the isotope goes down in half'

100 mg, then 50 mg, then 25 mg, then 12.5 mg, then 6.25 mg, then 3.125 mg and finally (reaching 1.5625 mg

That was 6 periods of 6 hours each, which totals: 6 time 6 hours = 36 hours

A compound contains 57.2 percent carbon, 6.1 percent hydrogen, 9.5 percent nitrogen, and 27.2 percent oxygen. What the empirical formula of the compound?

Answers

Answer:

So the empirical formula is C14H18N2O5

Explanation:

C = 57.2% = 12g/mol

H = 6.1% = 1g/mol

N = 9.5% = 14g/mol

O = 27.2% = 16g/mol

Empirical Formula for compound hmm

Assume

C = 57.2g

H = 6.1g

N = 9.5g

O = 27.2g

So we have

C = 57.2g/12g =  4.76  moles

H = 6.1g/1g      =  6.10   moles

N = 9.5g/14g   =  0.68  moles

O = 27.2g/16g =  1.70   moles

Divide each mole value by the smallest number of moles calculated.  Round to the nearest whole number.

C =  4.76  moles / 0.68 moles = 7

H = 6.10   moles / 0.68 moles = 9

N = 0.68  moles / 0.68 moles = 1

O = 1.70   moles / 0.68 moles = 2.5

Ok so we now have the ratios but for O it's 2.5, have to be whole numbers so we will need to double all the numbers.

C = 14

H = 18

N =  2

O =  5

So the empirical formula is C14H18N2O5

A planetary explorer vehicle
on Earth weighs 1850
pounds, what would it weigh
on the surface of Neptune,
which has 1.2 times the
gravity of Earth?
A. more than on the Earth
B. less than on the Earth
C. the same as on Earth

Answers

Answer:

more

Explanation:

Answer:

A. More than on the Earth

Explanation:

What state of matter has indefinite volume and is compressible?

a. Gas

B. Liquid

C. Both Liquid and Gas

D. Solid

Answers

The answer is A. Gas

what is characteristics of the 6kingdoms

Answers

Answer:

Archaea, Bacteria, Protista, Fungi, Plantae, and Animalia

What is characteristics of the 6 kingdoms.

6 kingdoms of what? Are you talking about biology?

If yes I assume you're talking about the defitions for the animal kingdom made by Woese and his colleagues in 1977.

Eubacteria:  Single-celled bacterial organisms.

Archaebacteria: Single celled bacterial organisms that live in extreme enviroments

Protista : Single-celled organisms more complex than bacteria

Plantae: Multi-celled, complex organisms that produce their own food

Fungi: Multi-celled organisms that don't produce their own food

Animalia: Complex, multi-celled, organisms that consume other organisms for food.

1. Identify whether each of the elements is a metal, non-metal, or metalloid:
Ruthenium: Neon:
Germanium: Neptunium:
Iodine: Strontium:
Cesium: Europium:

Answers

Answer:

neon - non metal

Explanation:

Answer:

Ruthenium → metalloidNeon → non-metalGermanium → metalloidNeptunium → metalIodine → non-metalStrontium → metalCaesium → metalEuropium → metal


Balance this equation. If a coefficient of "1" is required, choose "blank" for that box.

C + Fe ₂ O ₃ → CO ₂ + Fe

Answers

Answer:

3C + 2Fe ₂ O ₃ → 3CO ₂ + 4Fe

Explanation:

C + Fe ₂ O ₃ → CO ₂ + Fe

Left Side

C = 1

Fe = 2

O = 3

Right Side

C = 1

Fe = 1

O = 2

So we can see that while Carbon is balanced Fe and O are not.

We then attempt to balance the equation by balancing the Oxygen.

C + 2Fe ₂ O ₃ → 3CO ₂ + Fe

Left Side

C = 1

Fe = 4

O = 6

Right Side

C = 3

Fe = 1

O = 6

Oxygen is now balanced but C and Fe are not, though this is an easy fix as each are independent on each side of the equation.

3C + 2Fe ₂ O ₃ → 3CO ₂ + 4Fe

Left Side

C = 3

Fe = 4

O = 6

Right Side

C = 3

Fe = 4

O = 6

Answer:

2 , 3 , 4 , 3

Explanation:

Other Questions
.To make your response longer, more interesting, and with a GREATER RANGE OF IDEAS which of the following acronyms can help you to think about the WIDER IMPLICATIONS OF YOUR TOPIC? 1.AFOREST alliteration, facts, opinion, repetition, emotive language, statistics and tricolon. 2.HEEFF the impact of your topic on health, education, environment, family and finances. 3.LOD like or dislike. I WILL GIVE THE FIRST ANSWER BRAINLIEST(01.07 MC)Read each incomplete sentence and choose the option with the correct verbs to complete them.Tengo 15 aos y ________ estudiante. Mis amigas Juana y Leticia ________ bomberas. A. es; eres B. estn; estn C. estoy; est D. soy; son In a paragraph of five to eight sentences in English and with examples from your culture's holidays and/or Ecuador's holidays, answer the following question: Can a good holiday come out of negative elements like greed, death, and war? Explain your answer and give examples. Solve |4x +2|= 6 a.1 or -2b.-1 or 2c.1s.2 8(3+a)=64 what is a=? Under which president were the 16th and 17th amendments passed? A horizontal boxplot is plotted along a horizontal axis marked from 70 to 150, in increments of 5. A left whisker extends from 80 to 90. The box extends from 90 to 115 and is divided into 2 parts by a vertical line segment at 105. The right whisker extends from 115 to 130. All values estimated. A horizontal boxplot is plotted along a horizontal axis marked from 70 to 150, in increments of 5. A left whisker extends from 80 to 90. The box extends from 90 to 115 and is divided into 2 parts by a vertical line segment at 105. The right whisker extends from 115 to 130. All values estimated. The box plot suggests that about 50\%50%50, percent of high schools in Orange County have more than what number of band members? Choose 1 answer: 100 POINTS!!!!! Paleo-Indians usually traveled in groups of _____ people. A. 20 50 B. 50 70 C. 70 100 D. 100 125 Find the value of x in the figure below how does amanda tackle her nagging parents explain with examples from the poem ? what should be your advice to children whao suffer in slience like amanda Caroline, krutika and Natasha share some sweets in the ratio 4:5:1 HOW CAN I SOLVE THIS QUESTION? PLEASE HELP The movement of a locomotive piston in the cylinder is limited to 0.76 m. Assume that the piston makes a simple harmonic movement that makes 180 revolutions per minute, and find its maximum speed. You find a rock containing a mixture of the element and lead. You determine that 30% of the original element remains; the other 70% decayed into lead. How old is the rock? amWhich of the following was NOT ause for fire during the PaleolithicEra?A. Cooking foodB. ProtectionC. HeatD. Melting iron What role did Abraham Lincoln play in the Mexican American war What function does the noun clause bolded in the sentence below provide?There was a town hall meeting held for citizens to voice their concerns about the new shopping center being built.Select the best answer from the choice provided.A. indirect objectB. direct objectC. object of a prepositionD. subject A train travels 180 miles in 2 hours. A jet goes 7 times faster. How far can the jet fly in 5 hours? Solve in space above. What are two elements that algae thrive on ? how is converting percentages to and from fractions and decimals used in daily life An unknown compound, B, has the molecular formula C7H12. On catalytic hydrogenation 1 mol of B absorbs 2 mol of hydrogen and yields 2-methylhexane. B has significant IR absorption band at about 3300 and 2200 cm-1. Which compound best represents B? a. 5-methyl-1,3-hexadieneb. 5-methyl-1-hexynec. 3-methyl-1-hexyned. 5-methyl-2-hexynee. 2-methyl-1,5-hexadiene