Activity 1.3 Put an unlit incense stick in a corner of your class. How close do you have to go near it so as to get its smell? Now light the incense stick. What happens? Do you get the smell sitting at a distance? Record your observations.​

Answers

Answer 1
for the first one you have to be very close to smell it, when lit the aroma fills the class because there is no ventilation and how there is no way for the gas to leave the room

Related Questions

Questions 1. Why does the colour change not occur instantly? Questions 1 . Why does the colour change not occur instantly ?in the reaction between carbon dioxide and water

Answers

Answer:

which is an example of analog device

Due to the reaction's slow process of producing ppt or a change in color.

What is chemical reaction?

Chemical reaction is defined as a procedure where one or more compounds, known as reactants, are changed into one or more new substances, known as products. Chemical reactions result in the formation of new chemical bonds between the atoms of the reactant molecules and the product particles' atoms. While there are the same number of atoms both before and after the chemical transition, there will be a change in the number of molecules.

When carbon dioxide and water combine, carbonic acid is created. The indicator changes color as a result of the water becoming slightly acidic due to carbon dioxide gas from exhaled breath. Dissolution causes a change in pressure. This suggests a physical alteration.

Thus, due to the reaction's slow process of producing ppt or a change in color.

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Please help asap!!!!!!

Answers

Answer:

my increasing the amount of input force inorder to lift the load

Identify bond types as either ionic, metallic or covalent
HCN
Fe
PbO
Si

Answers

Answer:

In ionic bond one element should be metal and next should be non metal. in covalent both element should be met Alice. if there valence electron is less than 4 than it is metal or more than 4 it is non metal.

What is the number of elements in 2Ca(OH)2

Answers

Answer:
3 elements
Calcium,oxygen and hydrogen

A team of scientists altered the DNA of E. coli bacteria. The bacteria thus developed had the ability to generate insulin exactly identical to the human insulin molecule. What could be the likely impact of this biotechnology on the individual and the society?

The medical costs for insulin-dependent patients would rise.
Large-scale insulin could be produced in relatively lesser time.
The price of insulin available from sources other than bacteria may fall.
The patients who take insulin may become infected with E. coli bacteria.

Answers

Answer:

Large-scale insulin could be produced in relatively lesser time.

Explanation:

We already sort of do this where we infect the bacteria with a plasmid containing our insulin gene and it causes them to produce insulin. Since the question is saying that we edited their DNA directly, now these bacteria don't need to be infected with plasmid b/c now they can just pass these genes onto their offspring.

This will allow us to make TONS of insulin cuz bacteria are crazy good at making stuff and growing.

QUESTION 1
What happens when water droplets are on a glass surface?
O They scatter around, maintaining their spherical shapes.
They spread and stick to the surface.
They join to form on gigantic sphere.
O They evaporate.

Answers

Answer:

It appears all of them are correct
Smaller drops will scatter around while maintaining their shape
Larger drop will spread stick to the surface.
and drops close together will join to form on gigantic sphere(but not perfect sphere)
and if they are in the sun, they'll eventually evaporate

Explanation:

How many grams of Fe(NO3)3 are present in a 20.0 mL sample of a 0.500 M solution?

Answers

2.42 grams are present.

The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.80g of Fe(NO[tex]_3[/tex])[tex]_3[/tex] are present in a 20.0 mL sample of a 0.500 M solution.

What is molarity?

Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

Molarity= number of moles of solute/volume of solution in litre (1)

Where,

moles= given weight /by molecular weight

         = w/241.8

Substituting values in equation 1

0.500= (w/241.8)/(20.0 /1000)

w=0.80g

Therefore, 0.80g of Fe(NO[tex]_3[/tex])[tex]_3[/tex] are present in a 20.0 mL sample of a 0.500 M solution.

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What type of reaction is illustrated?

Answers

Answer:

Synthesis

Explanation:

Carbon + Difluorine = Tetrafluoromethane.

1 mole of Carbon [C] reacts with 2 moles of Difluorine [F2] to form 1 mole of Tetrafluoromethane [CF4]

i think it would be A

Approximately 50% of our bone is chemically calcium phosphate, Ca3(PO4)2
If an adult has 12 kg of bone, calculate the mass of calcium is present

Answers

yea ion know i just want sun point lol o m g is it rekutten ;)

10. Two primary sites for the
polio virus replication?

Answers

Answer:

the cytoplasm

protein 3b more commonly called vpg

How would you draw the ionic compound Beryllium Arsenide lewis structure?

Answers

Answer:

[Na]^+ [Cl]^-

Explanation:

Lets say its sodium, its number of electrons is 11, but when its stable (an ion), it is 10. and chloride, number of electrons is 17, but when its stable (an ion) it is 18. So the lewis structure for that is, remember with the straight brackets (not sure what it's called, but you know what I mean I guess) its this one: [ ]

Sodium will be + because it has more protons (11-10 = +1), and chloride will be - because it gained an electron, so has more electrons than protons (17-18 = -1)

So the lewis structure would be:

[Na]^+  for sodium

and

[Cl]^- for chlorine

Sodium chloride:

[Na]^+ [Cl]^-

Also just to add, only 1 of each atom (Na and Cl) was needed for the bonding, but if let's say example; 2 Cl was needed to bond with sodium, there would be 2 Cl (same) and 1 Na.

You are watching tv and you see something on the corner of your eye what do you do and you're home alone

Answers

Talk to the doctor if you see something in the corner of your eye.

What is a visual hallucination?

Visual hallucinations involve seeing things that aren't there.

It's called a visual hallucination, and it can seem like your mind is playing tricks on you. Beyond being scary or stressful, it's also usually a sign that something else is going on.

So if it's happening to you, talk to your doctor. That's the first step toward getting better.

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Is XeCl4 a molecular compound?

Answers

Answer:

Hint for Naming XeCl4

We have two non-metals so this is a molecular (sometimes called covalent) compound.

A hot-air balloon has a pressure of 0.715 atm while the temperature outside is 200C. What will the pressure be if the temperature drops to 5C while the volume remains constant?

1.12 kPa

11.2 atm

1203 atm

1.12 atm

Answers

If the temperature drops to 5⁰C and the volume remains constant, the value of pressure will be 0.668 atm.It can be found using Ideal gas equation.

What is Ideal gas equation ?

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

From the question given above, the following data were obtained :

Initial pressure (P₁) = 0.715 atmInitial temperature (T₁) = 200 °CFinal temperature (T₂) = 195 °CVolume = constantFinal pressure (P₂) = ?

Now, Let's convert celsius temperature to Kelvin temperature ;

T(K) = T(°C) + 273

Initial temperature (T₁) = 200 °C = 200 °C + 273  = 473 KFinal temperature (T₂) = 195 °C = 195  °C + 273  = 462 K

Now, we shall can determine the final pressure (P₂)  ;

Initial pressure (P₁) = 0.715 atmInitial temperature (T₁) = 473 KFinal temperature (T₂) = 462 KFinal pressure (P₂) = ?

P₁ / T₁ = P₂ / T₂

0.715 / 473 = P₂ /  462

473 × P₂ = 0.715 × 462

P₂ = 0.69 atm

Thus, the final pressure of the hot air balloon is 0.69 atm

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Question 18 of 32
What is a covalent bond?
OA. A bond in which molecules share electrons
OB. A bond in which atoms share electrons
C. A bond between ions of the same charge

Answers

Answer: A. A bond in which molecules share electrons

How many moles of zinc, Zn, are in 1.31×1024 Zn atoms?

Answers

Answer:

=7.89013× 10^47 moles of zinc

Explanation:

1 atom contains 6.023×10^23 moles.

1.31×10^24 atoms of zinc contain6.023×10^24×1.31×10^.24

light frequency 1.40x10^15 Hz strike a surface causing photoelectrons to leave with a KE of 1.05 eV what is the work function in eV

Answers

Answer:

The Work Function is 4.74eV.

Explanation:

The photoelectric effect is a phenomenon in which a beam of light is projected towards a metal plate and this leads to the ejection of electrons from the metal. The minimum amount of energy required for this ejection of electrons is known as the work function. When the energy of the light beam is less than the work function, then the electrons are not emitted.

The photoelectric effect is represented by the equation:

E = φ + KE  where

E = energy of the incident photons

KE = kinetic energy of photoelectrons

φ = Work function of the metal

This can also be written in terms of frequency as:

h = h₀ + [tex]\frac{1}{2}[/tex] mv²

= frequency of the incident light beam

₀ = frequency of the photoelectrons

m = mass of the electron

v = velocity of the electron

h = Plank's constant 6.623 x 10⁻³⁴Js

Conversion factor: 1eV = 1.602 x 10⁻¹⁹ J

So, 1.05eV = 1.682 10⁻¹⁹ J

Using the formulas,

(6.623 x 10⁻³⁴Js)(1.40x10¹⁵ s⁻¹) = φ + 1.682 x 10⁻¹⁹ J

(9.272 x 10⁻¹⁹) - (1.682 x 10⁻¹⁹) = φ

φ = 7.590 x 10⁻¹⁹ J = 4.74 eV

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Number of molecules in .99 mol C6H5NO2

Answers

Answer:

5.96 * 10^23 molecules

Explanation:

Don't start counting up the number of CsHsNs and Os there are Counting up the atom ions will get a wrong answer.  The question is asking for the number of molecules. That means you do not break down each molecule to  find the number of molecules. You modify 1 mol to find out how many molecules are in 0.99 mols. Do that using a proportion.

1 mol contains 6.01 * 10^23 molecules

0.99 mol contains x

1/0.99 = 6.02 * 10^23 / x molecules

x = 0.99 * 6.02 * 10^23

x = 5.96 * 10^23

Classify each of the following substances as a compound or element.
a. Gold _____________
b. Ethanol _____________
c. Sugar _____________
d. Sulfur _____________
e. Hydrogen gas______
f. Carbon dioxide_______

Answers

Answer:

A. Element

B. Compound

C. Compound

D. Element

E. Compound

F. Compound

Explanation:

Elements are what is already on the periodic table and compounds are the substances created when they are combined.

HELP!!! LOTS OF POINTS AND I GIVE BRIANLEST NO FAKE ANSWERS
Given the following data for water:

Heat of fusion = 334 J/g
Heat of vaporization = 2,256 J/g
Specific heat of solid = 2.09 J/(g °C)
Specific heat of liquid = 4.184 J/(g °C)
Specific heat of gas = 1.84 J/(g °C)

Calculate how much energy is needed to change 50.0 grams of ice at −15.0 °C to liquid water at 50.0 °C. (3 points)

a
11,900 J

b
16,300 J

c
18,300 J

d
21,100 J

Answers

Answer:

18300 J

Explanation:

this is because the amount of energy can be changed

NH4Cl + AgNO3 → AgCl + NH4NO3

Answers

A N S W E R :

It's a balanced equation!This is a precipitation reaction.AgCl is the formed precipitate.


If the earth were the size of an apple, which piece would best represent the amount of mass of the
atmosphere?
O the skin
O the meat
O the stem
O Oops..... I am sorry. I just ate the Pacific Ocean by mistake.
O a seed

Answers

The answer to the question would be the skin.

If aluminum has a density of 2.7 g/cm³, what is the volume of 2.7 grams of aluminum?​

Answers

Answer:

Solution Density of aluminium = 2.7 g/Cm 3 In kg/ m 3 = 27 × 1000 10 =2700 kg/ m 3

Explanation:

Not much of one


1. 50.0 g of an unknown metal was heated to 95.0 °C and added to 45.0 g of water at 25.0 °C
in a calorimeter. Once the system reached equilibrium the final temperature was 28.5 °C.
Calculate the specific heat capacity of the metal with correct units.
2. 60.0 g of nickel heated to 100.0 °C was added to 55.0 g of water at 25.0 °C inside a
calorimeter and the system was allowed to reach equilibrium. What would be the final
temperature of the metal and water? (specific heat of Ni = 0.44 J/g °C)
.
3. One challenge during calorimetry is to minimize the heat lost to the environment during
the experiment. Suggest how you would minimize the heat loss during the experiment (read
the steps of the experiment before you answer the question)

Answers

Answer

Q = mcΔT

Qwater = -Qmetal

(100 g)(4.18 J/g°C)(25°C - 20°C) = -(50 g)c(25°C - 90.0°C)

2090 J = (3250 g °C)c

c = 0.643 J/g °C

just need help with one question pls

Answers

Answer:

A large absorption at 2950 cm⁻¹ indicates that there is likely an sp³C-H functional group somewhere in the molecule. The "sp³" designation means that this is a single bond because these atoms have 4 orbitals available (s + p + p + p) for hybridizing, meaning only single bonds are possible.

What is an open system?
A. A system that allows energy to move in and out but not mass
B. A system that allows energy and mass to move in and out of it
C. A system that allows mass to move in and out but not energy
OD. A system that does not allow energy or mass to move in or out of
it

Answers

Answer:

Open system :-

B. A system that allows energy and mass to move in and out of it.

Hope it helps!

Consider the following reaction.
2Fe2O3(s)+3C(s)−→−heat4Fe(s)+3CO2(g)
Calculate the number of grams of Fe2O3 needed to react with 18.3 g C.

Answers

Answer:

162 g Fe₂O₃

Explanation:

To find the mass of Fe₂O₃, you need to (1) convert grams C to moles C (via molar mass from periodic table), then (2) convert moles C to moles Fe₂O₃ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles Fe₂O₃ to grams (via molar mass). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to reflect the given value.

Molar Mass (C): 12.011 g/mol

2 Fe₂O₃(s) + 3 C(s) ---> 4 Fe(s) + 3 CO₂(g)

Molar Mass (Fe₂O₃): 2(55.845 g/mol) + 3(15.998 g/mol)

Molar Mass (FeO): 159.684 g/mol

18.3 g C           1 mole            2 moles Fe₂O₃          159.684 g
--------------  x  ----------------  x  -------------------------  x  -----------------  = 162 g FeO
                        12.011 g              3 moles C                 1 mole


Hydrogen peroxide is a liquid that decomposes to form oxygen gas and
water. The occasional bubble you might see in a beaker that contains
hydrogen peroxide is evidence of this reaction. But if a small amount of
manganese oxide powder is added to the beaker, many small bubbles start
forming in the liquid. What part does the manganese oxide play in this
reaction?

A. It is a catalyst that increases the rate of the reaction.

B. It is a substance that supplies extra energy for the reaction.

C. Its addition to the liquid makes molecules of hydrogen peroxide
move faster.

D. It is a reactant that is necessary for the reaction to begin.
SUBMIT

Answers

A would be the answer to this question

examples of molecular compound

Answers

Answer:

Molecular compounds are inorganic compounds that take the form of discrete molecules. Examples include such familiar substances as water (H2O) and carbon dioxide (CO2). These compounds are very different from ionic compounds like sodium chloride (NaCl).

Which of the following statements would correct one of the roles listed in the table?
O Glucose combines with water to form carbon dioxide,
OGlucose reacts with carbon dioxide during photosynthesis.
OOxygen is formed along with glucose during photosynthesis.
O Chlorophyll stores chemical energy needed for photosynthesis.

Answers

Answer:

a

Explanation:

glucose combined with water to form carbon dioxide

Answer:

Option C

Explanation:

Because during photosynthesis the reaction is as per following

CO_2+H_2O—»C_2H_12O_6+O_2

Clearly

Glucose nd oxygen are formed

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