when do you consider that a typhoon will enter or effect the country​

Answer:

reflection is correct answer by my views

Answer:

option a. second

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

Answer:

ion-dipole interaction

Explanation:

Ethanol is a polar molecule due to the presence of the polar O-H group in the molecule. This means that the molecule has a dipole moment.

The positive end of the dipole lies on hydrogen while the negative end of the dipole lies on oxygen.

When KCl is dissolved in ethanol, K^+ ions can interact with the negative end of the dipole in ethanol by ion-dipole interaction.

Answer:

Ortho nitrophenol is more acidic than ortho-methoxyphenol.

Reason:

This is because the nitro-group is an electron-withdrawing group. In the case of ortho methoxyphenol; methoxy group is an electron-releasing group. Thus, it increases the electron density in the O−H bond and hence, the proton cannot be given out easily.

Hope this helps you. Do mark me as brainliest.

Answer:

(C5H7)8

Explanation:

It's empirical formula is given as; C5H7

Molar mass of carbon(C) = 12 g/mol

Molar mass of hydrogen(H) = 1 g/mol

We are told that it's molar mass is 536 g/mol.

To find the molecular formula;

Molecular formula = n × empirical formula

Thus;

n = 536/((12 × 5) + (1 × 7))

n = 8

Thus;

Molecular formula = (C5H7)8

2 × 10²⁴ atoms Co

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

4 mol Co (Cobalt)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 1 sig fig.

2.4088 × 10²⁴ atoms Co ≈ 2 × 10²⁴ atoms Co

Answer:

41.88375 g Fe

Explanation:

Using stoichiometry, we can do this problem. First, we put our given. Then we create an equation using the molar mass of Fe (found on the periodic table, which was 55.845 g Fe), and the resulting equation is:

[tex]0.75 mol Fe * \frac{55.845 g Fe}{1 mol Fe}[/tex]

The mol Fe's cancel, and leave us with:

41.88375 g Fe

Good luck.

Answer: Filtration technique

Explanation:

The technique used here is called filtration.

Filtration,is a physical separation process that separates a mixture of an insoluble solid from a liquid ( acting as the solvent) by the use of a filter barrier that allows only the fluid to pass through.

In the case from the question,

As water is poured over the ground coffee, it forms a mixture of which the insoluble solid is the coffee grounds, the water is the liquid  and the filter barrier is the piece of paper  which allows only the brown  liquid coffee to pass through as the filtrate.

Answer:

Catalyst, in chemistry, any substance that increases the rate of a reaction without itself being consumed.

...

Catalyst.

process catalyst

ammonia synthesis iron

sulfuric acid manufacture nitrogen(II) oxide, platinum

cracking of petroleum zeolites

Answer:

2 NaF + Br2 --> 2NaBr + F2

Explanation:

Well first I notice that there are two flourines on the products side so we need to put a 2 of NaF. Now there are 2 sodiums on the products side so we have to put another two in front of NaBr.

2 NaF + Br2 --> 2NaBr + F2

Answer:

Crash sensors measure how quickly a vehicle slows down in a frontal crash or accelerates to the side in a crash Some vehicles are equipped with a sensing system designed to detect the onset of a rollover crash Rollover crash sensors may be located in the ecu or at the center of the vehicle

The the Crash trip sensors in cars that send an electric signal to an ignitor The heat generated causes sodium azide to decompose into sodium and nitrogen gas which inflates the airbags

Explanation:

have a nice day

Answer:

T₂ = 800 K

Explanation:

Given that,

Initial temperature of the gas, T₁ = 127°C = 400 K

Initial volume, V₁ = 10 L

Final volume, V₂ = 20 L

We need to find the new temperature.

The volume of a gas is directly proportional to its Kelvin temperature.

Let T₂ is the new temperature. So,

[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{20\times 400}{10}\\\\T_2=800\ K[/tex]

So, the new temperature of the gas is 800 K.

Answer:

Many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. We use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil.

Answer:

Water, solar energy, carbon dioxide

Explanation:

Answer:

Poisons are used less today than they were in the past because forensic scientists can easily detect many substances and toxins during an autopsy.

The main factor that influenced this change is advancements in forensic toxicology knowledge and technology.

good luck, i hope this helps :)

Explanation:

Today poisons are used less because forensic scientists now have much more equipment and have an easier time at identifying poisons like arsenic, which were not so easy to find in the past. The main factor influencing this change is the new technology and knowledge that was unavailable in the past.

Answer:

1. 636miles/hour

2. 53.65milesper hour

3.696miles per hour

4.37.09mikes per hour

5. 6.99miles/hour

Explanation:

you first convert all the time into improper fractions

then work out speed which is got by dividing distance with time

Answer:

0.68 mol/L

Explanation:

M=m/l

m is moles and l is liters

Since they gave us the values in the correct units, all we have to do it plug it in

M=0.34 mol/0.5 liters

M=0.68

Answer:

Um... 6

Explanation:

C6H12O6

The O is oxygen and the 6 is the exact number of atoms

Answer:

the answer is 172g

Explanation:

200 × 0.86 = 172g

Explanation:

An oxyacid, oxoacid, or ternary acid is an acid that contains oxygen. Specifically, it is a compound that contains hydrogen, oxygen, and at least one other element, with at least one hydrogen atom bonded to oxygen that can dissociate to produce the H+ cation and the anion of the acid.

Answer:

oxyacid, oxoacid

Explanation:

An oxyacid, oxoacid, or ternary acid is an acid that contains oxygen. Specifically, it is a compound that contains hydrogen, oxygen, and at least one other element, with at least one hydrogen atom bonded to oxygen that can dissociate to produce the H+ cation and the anion of the acid.

Answer:

C. A one (1) is assumed when there is no coefficient

Explanation:

The following chemical equation is given in the attachment:

2H2 + O2 → 2H2O

In this reaction, Hydrogen (H2) and oxygen (O2) gases are the reactants and they combine to form H2O, which is the product. It is necessary that, in accordance to the law of conservation of matter, the same number of atoms of each elements on the reactant side equates that on the product side. When this happens, the equation is said to be BALANCED.

However, to balance an equation, COEFFICIENTS are used. In this equation above, coefficients 2 is used in front of both H2 and H2O but no coefficient is used in front of O2. This is because 1 mole of oxygen is on the reactant and product side respectively. However, one is assumed when no coefficient is written i.e. O2 means 1 mole of oxygen molecule.

Answer:

HI is least polar

Explanation:

Answer:

there are 5 molecules in SO⁴

first find the atomic weight of CH3 which would be

atomic weight: 12.011 (3×1.008) = 36.32 g/mol

then find the moles in the given mass

36.32 ÷ 45.7 = 0.794

I HOPE I'M NOT WRONG I HAVENT DONE CHEM IN SO LONG