True or False
a. The cones in our eyes detect color, while the rods perceive brightness.
b. In white light, white objects absorb all the colors.
c. At night, when light is dim, our cones are not activated so objects will appear as their normal color.
P.
d. Violet has the longest wavelength which is why it gets refracted the most.
V
e. The angle of incidence always equals the angle of reflection.

Answers

Answer 1

true

false

true

true

false


Related Questions

5.(08.02 MC)
A 0.0400 M NaCl solution was formed when 32.0 grams of NaCl was dissolved in enough water. What was the total volume of the solution formed? (5 points)
O 7.20 liters
9.80 liters
13.7 liters
18.1 liters

Answers

Answer:

13.7 liters

Explanation:

I took the test and got it right

The total volume of the NaCl solution whose molarity is 0.04 M is 13.7 liters.

What is molarity?

Molarity of any solution is define as the number of moles of solute present in per liter of the solution and it will be represented as:

M = n/V

Mass from moles will be calculated as:
n = W/M, where

W = given mass of NaCl = 32g

M = molar mass of NaCl = 58.44g/mol

mole = 32g / 58.44g/mol = 0.547 mol

Molarity of solution = 0.04 M

On putting values on the above equation, we get volume as:
V = 0.547 mol / 0.04mol/L

V = 13.67 L = 13.7L

Hence required value of volume is 13.7 L.

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The volume of gas in a balloon is 1.90L at 21.0°C.The balloon is heated, causing it to expand to a volume of 5.70L. what is the new temperature of the gas inside the balloon?

Answers

Answer: The new temperature is [tex]63^{o}C[/tex].

Explanation:

Given: [tex]V_{1}[/tex] = 1.90 L,    [tex]T_{1} = 21.0^{o}C[/tex]

[tex]V_{2}[/tex] = 5.70 L,         [tex]T_{2} = ?\\[/tex]

Formula used to calculate new temperature is as follows.

[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]

Substitute the values into above formula as follows.

[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{1.90 L}{21.0^{o}C} = \frac{5.70 L}{T_{2}}\\T_{2} = 63^{o}C[/tex]

Thus, we can conclude that the new temperature is [tex]63^{o}C[/tex].

explain how lithium atom is positive charge​

Answers

Lithium is an element that has an electronic configuration of 2,1. So when forming bonds, it tries to release one of its electrons in the last shell to reach the octet state. Normally when atoms release electrons they get positive charge since the number of protons which bear positive charge, is higher than number of electrons which bear negative charge. So when reaching its octet state, lithium gains positive charge!

Hope this helps! Tbh am not good at explaining. If u have any doubts, ask me!

how many grams are in 3.0 moles of H2O

Answers

Answer:

18x3=54 gram

Explanation:

When you express molecular mass (in case of molecule)/atomic mass(in case of atom) in gram it will be equivalent to one mole. For example:

12 gram Carbon atom = 1 mole of Carbon atom = N number of Carbon atom

16 gram Oxygen atom= 1 mole of Oxygen atom = N number of Oxygen atom

32 gram Oxygen molecule (O2) = 1 mole of Oxygen molecule (O2) = N number of Oxygen molecule (O2)

similarly 1 mole of water is equivalent to molecular mass of water x 3 that is 18x3=54 gram. It would constitute 3N molecules of water.

N: Avogadro's number : 6.022140857 × 10^23

where do fossils live

Answers

fossils are often found in rock formations in the deep earth

The concentration of carbon-14 in a piece of wood from an ancient burial mound indicates that two half-lives of this radioisotope have passed. If the half-life (t 1/2) for carbon-14 is 5730 years, approximately how many years ago did this sample of wood die?

Answers

If the half-life for carbon-14 is 5730 years, then it will take 11,460 years to complete die of this sample.

What is half life period?

Half life period is a time of decay in which concentration of reactant is left half of its initial concentration, means half of the reactant will convert into product.

Total time of decay will be calculated as:

T = (t)ⁿ, where

t = half life time = 5730 years

n = number of half lives = 2 (given)

On putting values, we get

T = (5730)² = 11,460 years

Hence required time for decay is 11,460 years.

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Answer:

The first part is 5 and the second part is 28,650

answer questions 3 and 4 for a brainly!

Answers

Answer:

The correct answer is -

3. Butyne

4. Pentene

Explanation:

The names of such organic compounds are classified on the number of the carbon atoms and based on a number these prefixes are attached -

Meth - one carbon

Eth - two carbons

Prop - three carbons

But - four carbons

Pent - five carbons, and so on

The bonds can be identified by names of an organic compound by their suffixes -

- ane = single bond

- ene = double bond

-yne = triple bond

Thus, for question 3, carbon numbers are 4 and triple bond so Butyne, and similarly for question 4, 5 carbon atoms and double bond so Pentene.

plz help me solve this question is it A,B,C or D

Answers

Answer:

B - To increase the rate of the reaction

Explanation:

Catalysts speed up the reaction without being reactants or products, so aren't used up in the reaction.

2Cr^3 + 3Zn(s) -> 2Cr(s) + 3Zn^2 + (aq) which reactant is reduced and which is oxidicided

Answers

Answer:

Cr is oxidised

and

Zn is reduced

[ Reduced reactant ] :

Cr^( + 3 ) + 3 e^( - 1 ) ===》 Cr^( 0 )

_____________________________

[ Oxidicided reactant ] :

Zn^(0) ===》Zn^( + 2 ) + 2 e^( - 1 )

Which does not affect global wind belts
A.) air pressure
B.) land breezes
C.) the Coriolis effect
D.) the sun

Answers

Answer:

D. The Sun

Explanation:

The Sun does not affect global wind belts.

Land breeze does not affect global wind belts whereas other factors such as air pressure, Coriolis effect and the sun affected global wind patterns.

Factors affecting global wind belts

Unequal heating of the Earth's surface forms large global wind patterns. Those area which are near the equator, the sun warm air and this warm air rises at the equator and moves toward the poles. At the poles, the cooler air sinks and moves back toward the equator.

So we can conclude that land breeze does not affect but sun creates affect on the global wind pattern.

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Which of the following single replacement reactions will take place?
O Al + Mg(NO3)2 -->
O Cu + Mg(NO3)2 -->
Ca + Mg(NO3)2 -->
O Zn + Mg(NO3)2
-->

Answers

Answer:

O Al + Mg(NO3)2 -->

Explanation:

Which will decrease the rate of a reaction?

changing the temperature from 90ºC to 40ºC
adjusting the concentration from 30 ng to 60 ng
placing the substance in a smaller container
grinding the substance into a powder

Answers

Explanation:

The reaction rate decreases with a decrease in temperature. Catalysts can lower the activation energy and increase the reaction rate without being consumed in the reaction. Differences in the inherent structures of reactants can lead to differences in reaction rates.

Two hundred liters of helium at 2.00 atm and 28.0 °C is placed into a tank with an internal pressure of 5.92 atm. Find the volume of the helium
after it is creleased into the tank when the temperature of the tank.remains 28.0°C.
liters (Round to three sig figs)

Answers

Answer:

27*6 dkfkdh hshsnnsbssshs ss. hhshsns svs s ssjssgsyz

Explanation:

ysgshssbs

21. What type of cells are found on the retina and provide signals to the brain about incoming light?
A photoreceivers
B optic cells
C photoreceptors
D retina cells​

Answers

the answer to this question is C

Answer:

Explanation:

have a good day

3. How is the equilibrium position of this reaction affected
by the following changes?
2802 (g) + O2 (g) <-------------→ 2 S03(g) + heat
a. Lowering the temperature.
b. Decreasing the pressure
c. Removing oxygen
d. Adding sulfur trioxide (SO3).

Answers

Answer:

Explanation: a) Reaction is exothermic because heat is released

                       If temperature is lowered, amount of products is increased,

                      equilibrium transfers to right

b) If pressure decreases, equilibrium transfers to direction in which amount of gas moles is greater, also in left (reactants)

c) If Oxygen is removed, reaction which produces more oxygen is favoured, also balance changes to reactansts (left)

d) Adding product causes equilibrium transfer to left (reactansts)

1. Hay un gas con 700 milímetros de Mercurio de presión en 922 ml de volumen a 20 grados Celsius. Calcula la temperatura final a 500 mm de mercurio con 451 ml.

2. un gas ocupa un gas ocupa 205 mililitros a 20 grados centígrados y 1,05 atm. Calcule el volumen final a 60 grados centígrados y 2,4 Atmósferas de presión.
3. tenemos 22 L de un gas a una temperatura de 220 K y una presión de 5 Atm, si se modifican la presión a 6.5 atm y la temperatura a 200 K, cuál será el volumen que obtenemos.

Answers

Answer:

püvinlbxyfsswgrxzvnnchcyv nkivtcdg

Phenolphthalein meaning

Answers

Answer:

Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.

Answer:

Phenolphthalein is a chemical compound, a colorless crystalline solid, though pink in a alkaline solution, and is also used as an acid-base indicator.

Explanation:

A dead tree is not an important part of an ecosystem. T or F

Answers

false. a dead tree is still important part of our ecosystem.

If 250. ML of water are poured into the measuring cup, the volume reading is 8.45 oz . This indicates that 250. ML and 8.45 oz are equivalent. How many milliliters are in a fluid ounce based on this data?

Answers

Answer:

[tex]1oz=29.589ml[/tex]

Explanation:

From the question we are told that:

Initial Volume [tex]v_1=250ml[/tex]

Final Volume [tex]v_2=8.45oz[/tex]

Generally the equation for one ounce is mathematically given by

 [tex]1oz=\frac{v_1}{v_2}[/tex]

Therefore

 [tex]1oz=\frac{250}{8.45}[/tex]

 [tex]1oz=29.589ml[/tex]

URGENT! PLEASE HELP ASAP

A sample of Argon gas at a pressure of 813 mm Hg and a temperature of 54°C, occupies a volume of 10.4 liters. If the gas is heated at a constant pressure to a temperature of 74°C, the volume of the gas sample will be _____ L?

Answers

14.7 is the right answer plus 86

Consider the balanced reaction
below:
2Na + 2H2O → 2NaOH + H2
How many moles of sodium
hydroxide (NaOH) will be produced
from the complete reaction of 15.0 g
sodium?

Answers

Answer:

Moles of sodium = 15.0⋅g22.99⋅g⋅mol−1 = 0.652⋅mol . Given the stoichiometry of the reaction, clearly 0.652⋅mol sodium hydroxide will result.

Explanation:

please mark me

From the balanced chemical equation of the reaction, it is clear that, 2 moles or 46 g of sodium metal produce 2 moles of NaOH. Then, 15 g or 0.65 moles of Na metal will give 0.65 moles or 26 g of NaOH.

What is a balanced reaction ?

The balanced chemical equation of a reaction represent the correct stoichiometry of all the reactants and products in the reaction. It is balanced as per the law of conservation of masses. Hence, the total mass of the reactant side is equal to the total mass of the product side.

From the given balanced chemical equation of the reaction, it is clear that, 2 moles of Na reacts with one mole of water to give two moles of NaOH and one mole of hydrogen gas.

Atomic mass of Na = 23 g/mol

no.of moles in 15 g = 15 g /23g/mol = 0.65 moles.

2 moles of Na gives 2 moles of NaOH. Then, 0.65 moles of Na will given 0.65 moles of NaOH.

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how does a flourmill work?​

Answers

Explanation:

Answer ⬇️

These mills employed millstones that rotated against one another to crush grains into flour mill machine. They rely on a process of crushing grain between two rapidly rotating rollers, then separating the ground grain into individual components, including bran, germ and endosperm.

➡️dhruv73143(⌐■-■)

In a commercial mill, the grain is cleaned then “tempered", which means the grain is soaked in water to enlarge its moisture content to make it easier to roll. After it's tempered, the grain is moved through a series of rollers, which break up the grain into its separate parts: endosperm, bran and germ.



What is the use of flour mill?
A gristmill (also: grist mill, corn mill, flour mill, feed mill or feedmill) grinds cereal grain into flour and middlings. The term can refer to either the grinding mechanism or the building that holds it. Grist is grain that has been separated from its chaff in preparation for grinding.

List and describe two differences between pure substances and mixtures. Check all that apply. Check all that apply. The composition of a pure substance depends on the source, but the composition of a mixture doesn't depend on the source. The composition of a pure substance is always the same, regardless of the source, but the composition of a mixture can vary. The state of a pure substance is always the same, but the state of a mixture can vary. Mixtures can be separated into their components only by chemical changes; some pure substances can be separated into components by physical change. Mixtures can be separated into their components by physical changes; some pure substances can be separated into components by chemical change.

Answers

Answer:

The composition of a pure substance is always the same, regardless of the source, but the composition of a mixture can vary.

Mixtures can be separated into their components by physical changes; some pure substances can be separated into components by chemical change.

Explanation:

A chemically pure substance has a well defined and constant composition. The composition of a chemically pure substance remains the same irrespective of its source. Also, the components of a chemically pure substance may be separated by chemical changes.

Mixtures have a variable composition depending on their  respective sources. The composition of a mixture varies with the source of the mixture and mixtures are separated by physical processes.

A gas has a pressure of 3.33 kPa at 343 K. What will the new pressure be at 655 K if the volume does not change?

Answers

New pressure would be 6.36 kPa

How many grams are in 3.14 moles of PI₃?

Answers

Answer:

[tex]\boxed {\boxed {\sf 1290 \ g \ PI_3}}[/tex]

Explanation:

We want to convert from moles to grams, so we must use the molar mass.

1. Molar Mass

The molar mass is the mass of 1 mole of a substance. It is the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units (amu).

We are given the compound PI₃ or phosphorus triiodide. Look up the molar masses of the individual elements.

Phosphorus (P): 30.973762 g/molIodine (I): 126.9045 g/mol

Note that there is a subscript of 3 after the I in the formula. This means there are 3 moles of iodine in 1 mole of the compound PI₃. We should multiply iodine's molar mass by 3, then add phosphorus's molar mass.

I₃: 126.9045 * 3=380.7135 g/mol PI₃: 30.973762 + 380.7135 = 411.687262 g/mol

2. Convert Moles to Grams

Use the molar mass as a ratio.

[tex]\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}[/tex]

We want to convert 3.14 moles to grams, so we multiply by that value.

[tex]3.14 \ mol \ PI_3 *\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}[/tex]

The units of moles of PI₃ cancel.

[tex]3.14 *\frac {411.687262 \ g \ PI_3}{ 1 }[/tex]

[tex]1292.698 \ g\ PI_3[/tex]

3. Round

The original measurement of moles has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tens place.

1292.698

The 2 in the ones place tells us to leave the 9.

[tex]1290 \ g \ PI_3[/tex]

3.14 moles of phosphorous triiodide is approximately equal to 1290 grams of phosphorus triodide.

what are the environmental impacts of coal

Answers

Answer:

Look down below

Explanation:

Environmmetal impacts that coal can cause is Sulfur dioxide (SO2), which contributes to acid rain and respiratory illness.

AND.....

Nitrogen oxides (NOx), which contribute to smog and respiratory illnesses. Particulates, which contribute to smog, haze, and respiratory illnesses and lung disease

ONLY ANSWER IF YOU ARE SURE PLEASE

Answers

The universal indicator is used to determine the presence of an acid or base, going from acid to base it changes in the order of the rainbow with green being neutral. Chemical X is Hydrogen Chloride (HCl) we know this because it is a strong acid therefore the indicator would turn red. Chemical Y is Sodium Hydroxide (NaOH) we know this because it is a base therefore the indicator would turn purple. Finally Chemical Z is Sodium Chloride (NaCl) which is neither an acid or base meaning it would turn green for neutral. Another thing that helped determine which one was an acid was Chemical had a reaction with the magnesium while the others did not, when reacted with bases, only the magnesium has a reaction.
Hope this helps :)

how many grams of caco3 are needed to react with 15.2g of hcl​

Answers

Answer:

Balanced equation:

CaCO3 (s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)

1mol CaCO3 will react with 2 mol HCl

Mol HCl in 32.8mL of 1.25M solution = 32.8mL / 1000mL/L * 1.25mol /L = 0.041 mol HCl

This will react with 0.041/2 = 0.0205 mol CaCO3

Molar mass CaCO3 = 100g/mol

Mass of CaCO3 reacted = 0.0205mol *100g/mol = 2.05g CaCO3.

Grams are the unit of weight or mass that depicts the quantity of a substance. The mass of calcium carbonate reacted is 2.05 gm.

What is mass?

Mass is the product of the moles of the compound and its molar mass, it is given in grams.

The balanced chemical reaction is given as:

[tex]\rm CaCO_{3} (s) + 2HCl(aq) \rightarrow CaCl_{2}(aq) + CO_{2}(g) + H_{2}O(l)[/tex]

From the reaction, 1 mole of calcium carbonate reacts with 2 moles of hydrochloric acid.

Moles of hydrochloric acid is calculated as:

[tex]\begin{aligned} \rm n &= \rm Molarity \times Volume (L)\\\\&= 0.0328 \times 1.25\\\\&= 0.041\;\rm mol\end{aligned}[/tex]

Now, the moles of calcium carbonate it will react with will be 0.0205 moles.

Mass of calcium carbonate is calculated as:

[tex]\begin{aligned} \rm mass &= \rm molar\; mass \times moles\\\\&= 0.0205 \times 100\\\\&= 2.05 \; \rm g\end{aligned}[/tex]

Therefore, 2.05 gm of calcium carbonate is needed to react with 15.2 gm of hydrochloric acid.

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Calculate the number of atoms in 6.5 moles of NaCI

Answers

Answer:

[tex]1 \: mole = 6.02 \times {10}^{23} \: atoms \\ 6.5 \: moles = (6.5 \times {6.02 \times 10}^{23} ) \: atoms \\ = 3.913 \times {10}^{24} \: atoms[/tex]

Is this an alpha or beta decay?

Answers

Answer:

alpha  decay

Explanation:

alpha decay

uranium decays into a alpha decay
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Bill is farsighted and has a near point located 125 cm from his eyes. Anne is also farsighted, but her near point is 75.0 cm from her eyes. Both have glasses that correct their vision to a normal near point (25.0 cm from the eyes), and both wear the glasses 2.0 cm from the eyes. Relative to the eyes, what is the closest object that can be seen clearly (a) by Anne when she wears Bill's glasses and (b) by Bill when he wears Anne's glasses Answer each question and round your answer to the nearest whole number 5-To rationalize the denominator of9-14 you should multiply the expression by which fraction?5+79-149- V149-149+ 149+ V141414 A small amount of food usually eaten between meals If you added 2 circles to the left side, how many squares would you have to add to the right side to keep it balanced? During the process of cellular respiration, eagerly is stored in the glucose molecule is used to form On December 31, the balance in the office supplies account is $1,300. A physical count shows $510 worth of supplies on hand. Required: Prepare the adjusting entry for supplies. Refer to the Chart of Accounts for exact wording of account titles. Michael puts $600 in a savings account that increases with a 5.25% interest compounded annually. Write a function that represents the amount of money in Michael's account and find how much money will Michael have in his account after 6 years if there are no withdrawals or deposits. Round to the nearest cent. Given m||n, find the value of x.+>m(5x+19)(6x+1) Lynx Corp. The data presented below for Lynx Corp. are for the year ended December 31, 2017: Sales (100% on credit) $1,000,000 Sales returns 30,000 Accounts receivable (December 31, 2017) 170,000 Allowance for doubtful accounts (credit balance) (before adjustment at December 31, 2017) 1,300 Estimated amount of uncollectible accounts based on aging analysis 14,000 See the data for Lynx Corp. If Lynx Corp. uses the aging of accounts receivable approach to estimate its bad debts, what amount will be reported as bad debts expense for 2017 Select the correct answer from each drop-down menu.How does a function work?A function takes values in the form of____, performs a calculation, and returns a ____.First blank:1. Keywords2. Arguments3. Math operatorsSecond blank:1. Result2. Cell reference3. Formula Which choices are equivalent to the fraction below? Check all that apply. Which food was one of the first recognized for its ability to reduce blood cholesterol and the risk of heart disease Mr. And Mrs. Smith went on vacation by car. When they began the odometer reading in the car was 28,575. When they returned the odometer reading was 29,684.How many gallons of gas, to the nearest gallon did they use on the trip?A48B36C.Not enough information is givenD26 Question 38Two cuboids are congruent. Which statement about their properties a.Each face has the same areab.One is larger than the otherc.They have the same volumed.The sum of the angles is 360 Find each missing measure. If she had allowed Helen to continue her behavior, it would affect Helens ability to learn because.. What causes you to miss an object you reach for when looking at it at an angle through two media?A. The eyes get confusing signals because they are interpreting information from two different places.B. The brain gets confusing signals because it is used to interpreting light that moves through air.C. The hands get confusing signals from the eyes because of the change in medium. How. Many 5s is in 200989 I need help with this assignment