The direction of a reflected ray will always match its:
angle of incidence.
refracted ray.
diffused angle.
None of the choices are correct.

Answer:

223.5 g

Explanation:

The formula between the number of moles, mass and Mr can be used to convert moles to grams.

Number of moles = mass ÷ Mr

So, mass = number of moles × Mr

  Mr of Li₂O = (6.9 × 2) + 16 = 29.8

∴ Mass = 7.5 × 29.8 = 223.5 g

The role of oxygen in cellular respiration is to make water molecules. hence, option (D) is correct.

Cellular respiration is the process in which cells break down molecules for energy.

The cells use oxygen to break down food in the form of glucose to produce water and release carbon dioxide.

During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. Carbon dioxide and water are created as byproducts.

In this reaction, energy is produced in the form of ATP that is used by the cell for its various activities.

Thus the correct answer is option D.

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Answer:

No.

A more reactive metal displaces or pushes out a less reactive metal from its compound. In the reactivity series, sodium is more reactive than iron hence no displacement reaction will occur.

1) The diagram shows an exothermic reaction since the potential energy of the products is less than that of the reactants, meaning energy was released.

2) To find the change in enthalpy, determine the difference between the potential energy of the products and the potential energy of the reactants. (on this diagram, C-A) To find the activation energy, find the difference between the potential energy of the reactants and the "peak" of the curve (on this diagram, B-A). For this diagram, both the enthalpy and activation energy are positive.

Answer:

Part 1 and Part 2 Answer

Explanation:

Part 1:

The reactions have higher potential energy than the products, this means it is an exothermic reaction.

Part 2:

Change in enthalpy is determined by the difference between potential energy of the reactants (A) and potential energy of the products (C). Because the reactants is higher than the products' and we know the reaction is exothermic, the change in enthalpy will be negative (-∆H).

The activation energy can be determined by the difference between the peak of the graph (B) and the potential energy of reactants (A). The activation energy would be positive.

Answer:

Monosaccharides

A monosaccharide is the monomer of a carbohydrate. Carbohydrates, such as sugars and starches, store energy. Others, such as cellulose and chitin, are structural in nature.

Answer:

monosaccharide

Explanation:

a monosaccharide is the monomer of carbohydrates.

Answer:

convert 250.0 mL in Liters :250. 0 / 1000 = 0,25 LDensity = 1.240 g/LMass

Explanation:

Answer:

The molar mass of CO2 = 44.01 g/mol

Explanation:

Start with 2.09 moles of HCl and convert to moles of CO2 For every 2 moles of HCl used, 1 mole of CO2 is formed.

2.09 mol HCl •(1 mol CO2/2 mol HCl) = 1.045 mol CO2

Now convert moles of CO2 to grams using the molar mass.

1.045 mol CO2 • 44.01 g/mol = 45.99 grams CO2

3 significant figures = 46.0 grams CO2

Hope This Helped

Answer:

silicon 0.712 J/g°C

Explanation:

i hope this helps you, sorry if im wrong, but this should be correct!

Answer:

.7109  j / gm-C

Explanation:

Specific heat =  j/gm-C

j = 2110     gm = 44.7     C = ( 89.6-23.2) = 66.4

2110 /(44.7 * 66.4) = .7109   j/gm-C

Answer:

2.5M

Explanation:

First calculate the gram-formula mass of CaCO3 (add up the mass of each element in the compound)

40.1 + 12.01 + 16(3) = 100.11

Now use the mole calculation equation on Table T and plug in the numbers

(Keep in mind that 25 is the given mass)

25/100.11 = 2.497 or 2.5M

In one trial, the unique rate of reaction was 6.93 μmol⋅L−1⋅s−1, the initial rate is 17.4 μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex] and rate of formation of sulfate ions was 11.6 μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex]

Reaction rate, in chemistry, is the speed at which a chemical reaction proceeds.

[tex](S_2O_8)^-^2 (aq) + 3 I^-(aq)[/tex] → [tex]2 S0_4^-^2 (aq) + 3I^- (aq)[/tex]

Rate of the reaction = -Δ [[tex]S_20_8^-^2[/tex]] /Δ t = -1/3 Δ [[tex]I^-[/tex]] /Δ t

5.8  μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex] = -1/3 Δ [[tex]I^-[/tex]] /Δ t

-Δ [[tex]I^-[/tex]] /Δ t =17.4 μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex]

So the rate of reaction of iodide ion =17.4 μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex]

+1/2Δ [[tex]S0_4^-^2[/tex]] /Δ t  = rate of reaction

+1/2Δ [[tex]S0_4^-^2[/tex]] /Δ t  = 5.8 μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex]

+ Δ [[tex]S0_4^-^2[/tex]] /Δ t  = 5.8 X 2 = 11.6 μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex]

Rate of formation of sulfate ions=11.6 μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex]

Hence, the initial rate is 17.4 μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex] and rate of formation of sulfate ions was 11.6 μmol⋅[tex]l^-^1[/tex]⋅[tex]s^-^1[/tex]

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[tex]\huge{\green}\fcolorbox{blue}{black}{\bf{\underline{\red{\color{brown}Answer}}}}[/tex]

4.44l

Explanation:

[tex] \sf Volume \: of \: gas \: before(V_1) = 2.7 \: l \\ \sf Pressure \: of \: gas \: before(P_1) = 0.63 \: atm \\ \sf 0.63 \times 101.3 = 63.8 \: kPa \\ \sf Volume \: of \: gas \: after(V_2) = ? \\ \sf Pressure \: of \: gas \: after( P_2) = 105 \: kPa[/tex]

[tex] \textsf{ By using Boyle's law} \\ \\ \tt{ \frac{P_1}{V_1} = \frac{P_2}{V_2} }[/tex]

[tex] \sf \longrightarrow \frac{2.70}{63.8} = \frac{V_2}{105} \\ \\ \\ \sf \longrightarrow \frac{2.7 \times 105}{63.8} = V_2 \\ \\ \\ \sf \longrightarrow \frac{283.5}{63.8} = V_2 \\ \\ \\ {\orange {\boxed{ \longrightarrow 4.44 \: l = V_2}}}[/tex]

Answer:

4.5 J wasted

Explanation:

10 % efficient means 90% wasted

90% of 5 J   =  .9 *5 = 4.5 J

Answer:

A.DNA

Explanation:

Ahaa Its gona be right

Answer:

D.N.A.

Explanation:

Hi student! Let me help you out on this question.

D.N.A. is the molecule which carries instructions for inherited traits.

[tex]\therefore,Option\quad A \quad is \quad correct[/tex]

Hope that this helped! have a good day ahead.

Answer:

the cells in your body

Explanation:

Most people that i have asked this similar question to, have said the sun. It's not the sun because the sun disappears at night. Your body produces heat because your cells are burning up energy.

The source that is unreliable is an advertisement for acne medication claims it can clear up acne in less than one week.

Citable sources are those sources that are gotten from places that are proven to be of good standards and not from mere claims such as:

Therefore, the source that is unreliable is an advertisement for acne medication claims it can clear up acne in less than one week.

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From the solubility curve as shown, the solution of 95g at 40 C can be said to be unsaturated.

The term saturated solution has to  do with a solution which contains just as much solute as it can normally hold at a particular temperature.

Looking at the solubility curve as shown, the solution of 95g at 40 C can be said to be unsaturated.

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Answer: 0

Explanation:

If 3 electrons were to be gained, then the number of protons would equal the number of electrons.

Answer:

2,137... gallons

Explanation:

(160+140+14x16x2)/350=2,137...

Answer: It is approximately 24.985837

Answer:

0.158g/L.

Explanation:

MM of helium gas or He =4 g/mol

P = 0.974 atm

T = 27 °C, but we need absolute temperature.

TK = TC + 273

T = 27 + 273 = 300 K

m/V = (4 g/mol · 0.975 atm) / (0.0821 L·atm/mol·K · 300 K)

m/V = 0.975/6.1575 g/L

m/V = 0.158g/L

Answer: The density of the helium is 0.158g/L.

Answer:

=2007.69 Torr

Explanation:

The new pressure of helium gas assuming constant temperature is equal to 2007.69

Torr.

Given the following data:

Initial volume = 293 mL

Final volume = 0.115 L

Initial pressure = 788 Torr

Temperature = 25°C.

Conversion:

Initial volume = 293 mL to L = 293/1000=0.293L

To determine the new pressure assuming constant temperature, we would apply Boyle's law:

Mathematically, Boyle's law is given by the formula;

PV=K

P1V1=P2V2

Where;

P1 is the original (initial) pressure.

P2 is the final pressure.

V1 is the original (initial) volume.

V2 is the final volume.

Substituting the given parameters into the formula, we have;

788×0.293 = P2 × 0.115

230.884 = 0.115P2

P2 = 230.884/0.115

P2 =2007.69

The purpose of classification is to identify objects with common or similar properties.

A mixture is composed of one or more pure substances in varying compositions.

It's important for scientists to know the properties of matter because all things are made up of matter.

Each type of matter has different physical characteristics and scientists need to know and understand these characteristics to make calculations.

The main phases of matter are solid liquid and gas.

Hence, the purpose of classification is to identify objects with common or similar properties.

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The molar mass of the unknown substance is 256.6 g/mol.

The molar mass of sucrose C12H22011 is 342 g/mol.

A 2% sucrose solution is isotonic with 1.5% solution of an unknown substance.

Molar mass of sucrose = Molar mass of unknown substance.

2% × 1000/342 = 1.5% × 1000/x

x = 342 × 1.5/2

x = 256.5 g/ mol

Therefore, the molar mass of the unknown substance is 256.6 g/mol.

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the number of neutrons in aluminium is 14

Answer:

14

Explanation:

number of neutrons in an atom is difference between mass number and atomic number

atomic number of Al is 13 and mass number of Al is 27

number of neutrons = 27 - 13 = 14

Answer:



a = 0.6 m/s² .

Explanation:

given that:

• Vi = 12m/s

• Vf = 21 m/s

• t = 15 s

• a = ?

∴ a = (Vf - Vi) / t

⇒ a = (21 - 12) / 15

⇒ a = 0.6 m/s² ...answer...

Note that:

▪ 'Vf' refers to final velocity

▪ 'Vi' refers to initial velocity

▪ 't' refers to time period

▪ 'a' refers to acceleration



hope that helps...

Answer:

.......................................

Answer:

1.47

Explanation:

acellus

Answer:

When we combine oxygen, and iron rust is produce.

Explanation:

The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur.

The heat will go up right above the top of the pot and then will go through the hole in the centre.

Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.

Conduction is probably the most basic and intuitive way of achieving heat transfer. Something hot touches something cool and the cool thing heats up. For instance, the water in a pot boils when the flame from the stovetop heats the pan, and the heat from the pan is transferred to the water via conduction.

Thus, the heat will go up right above the top of the pot and then will go through the hole in the centre.

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