Add 250.0mL to 5.00mL and round off the answer

Answer:

TRUE

Explanation:

Answer:

This statement is true.........

Answer:

i think true

Explanation:

Answer:

they become water vapor and after that, they become a type of precipitation

Answer:

R is the ideal gas constant

Answer:

aqueous solutions of silver nitrate and sodium chloride turn cloudy after mixing aqueous solutions of hydrochloric acid and sodium hydrogen carbonate produces bubbles on mixing Sodium hydroxide is mixed with water and the container feels warmer

Explanation:

A chemical change involves the formation of new substances. Also heat is absorbed or released in a chemical change. Another name for a chemical change is a chemical reaction.

In the first case, a reaction of the sort;

AgNO3(aq) + NaCl(aq) ---> AgCl(s) + NaNO3(aq)

The cloudy solution is due to the formation of AgCl precipitate.

In the second case, a reaction of the sort;

HCl(aq) + NaHCO3(aq) ---> NaCl(aq) + CO2(g) + H2O(l)

The gas evolved is due to the formation of CO2 in the process. Heat is also evolved showing that it is a chemical change.

To Find :

Gas’s temperature in Celsius when it has a volume of 25 L, 203 mol, 143.5 atm .

Solution :

We know, by ideal gas equation :

[tex]PV =nRT\\\\T = \dfrac{PV}{nR}[/tex]

Here, R is universal gas constant and [tex]R = 0.082 \ L \ atm \ mol^{-1} \ K^{1}[/tex]

Putting all given values and R in above equation, we get :

[tex]T = \dfrac{PV}{nR}\\\\T = \dfrac{143.5\times 25}{203 \times 0.082}\ K\\\\T = 215.52\ K[/tex]

Hence, this is the required solution.

Answer:

Reverse osmosis systems find frequent use in the following: Boiler feed-water treatment: used to reduce solids content of waters prior to feeding into boilers for power generation or otherwise.

Explanation:

Answer:yes they do represent

Answer is #4 (neutrons)

Explanation:

Total mass before the reaction is 236 amu. The total mass of the two elements is 233 amu. This means that there are 3 amus carried by element X. Looking at the total atomic number of the two elements after reaction, it's 92, the same as the one at the beginning. This means that element X has zero atomic number, which could only be a neutron.

Answer: is 4

Explanation:

I was doing the same one

Answer:

180 mmHg

Explanation:

Total volume of gases = 20% + 80%= 100%

Total pressure of gases = 900 mm Hg

Note that partial pressure of a gas = mole fraction × total pressure

Mole fraction of oxygen = 20/100

Hence partial pressure of oxygen= 20/100 × 900 mm Hg

partial pressure of oxygen= 180 mmHg

Answer:

2 halo - propane

Explanation:

We are told that a halo alkane is heated with sodium in the presence of dry ether to produce 2,3 - dimethyl butane.

Now, according to Wurtz reaction this formation from heating with sodium in the presence of dry ether is done by 2 alkyl halides in the form of;

2RX + 2Na → R−R + 2Na+X−

Now, formula for 2,3 dimethyl butane is (CH₃)₂CHCH(CH₃)₂

Thus, from the Wurtz reaction, we can write that;

2RX + 2Na → (CH₃)₂CH - CH(CH₃)₂ + 2Na+X−

So, R = (CH₃)₂CH

This means the original halo alkane has 3 carbon atoms and thus, we can say it is 2 halo - propane.

Answer: The correct number of significant figures in [tex]7.68 \times 4.564[/tex] is 35.05152.

Explanation:

Digits present in a number that helps in determining the degree of accuracy starting from the first non-zero digit is called a significant figure.

Some rules for significant figures are as follows.

For example, 2085 contains 4 significant digits.

For example, 0.0034 has 2 significant digits.

For example, 0.02500 has 4 significant figures.

For example, 19000 has 2 significant digits.

Now, the product of given digits is as follows.

[tex]7.68 \times 4.564 = 35.05152[/tex]

Thus, we can conclude that correct number of significant figures in [tex]7.68 \times 4.564[/tex] is 35.05152.

Answer: The answer is A.

Answer:

The answer is 44.0095. We assume you are converting between grams CO2 and mole.

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Answer:

Flavors and fragrances

Answer: The mass of [tex]H_2[/tex] produced is 0.153 g

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Given mass of zinc = 5.0 g

Molar mass of zinc = 65.38 g/mol

Putting values in equation 1, we get:

[tex]\text{Moles of zinc}=\frac{5.0g}{65.38g/mol}=0.0765mol[/tex]

Given mass of HCl = 10.0 g

Molar mass of HCl = 36.46 g/mol

Putting values in equation 1, we get:

[tex]\text{Moles of HCl}=\frac{10.0g}{36.46g/mol}=0.274mol[/tex]

The given chemical equation follows:

[tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]

By stoichiometry of the reaction:

If 1 mole of zinc reacts with 2 moles of HCl

So, 0.0765 moles of zinc will react with = [tex]\frac{2}{1}\times 0.0765=0.153mol[/tex] of HCl

As the given amount of HCl is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.

Thus, zinc is considered a limiting reagent because it limits the formation of the product.

By the stoichiometry of the reaction:

If 1 mole of zinc produces 1 mole of [tex]H_2[/tex]

So, 0.0765 moles of zinc will produce = [tex]\frac{1}{1}\times 0.0765=0.0765mol[/tex] of [tex]H_2[/tex]

We know, molar mass of [tex]H_2[/tex] = 2 g/mol

Putting values in above equation, we get:

[tex]\text{Mass of }H_2=(0.0765mol\times 2g/mol)=0.153g[/tex]

Hence, the mass of [tex]H_2[/tex] produced is 0.153 g

The reactants are A: Carbon Dioxide and water

Answer:

Option B. 4.25×10¯¹⁹ J

Explanation:

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

Frequency (f) = 6.42×10¹⁴ Hz

Energy (E) =?

Energy and frequency are related by the following equation:

Energy (E) = Planck's constant (h) × frequency (f)

E = hf

With the above formula, we can obtain the energy of the photon as follow:

Frequency (f) = 6.42×10¹⁴ Hz

Planck's constant (h) = 6.63×10¯³⁴ Js

Energy (E) =?

E = hf

E = 6.63×10¯³⁴ × 6.42×10¹⁴

E = 4.25×10¯¹⁹ J

Thus, the energy of the photon is 4.25×10¯¹⁹ J

Answer:

B. 4.25 x 10-19J is correct via a p e x

Explanation:

H2SO4 + 2KCL ----------› K2SO4 + 2HCL

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Answer:

Examples of physical change include changes in the size or shape of matter. Changes of state—for example, from solid to liquid or from liquid to gas—are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.

Explanation:

Explanation:

here u go the Answer with the working:)

Answer: The molality of naphthalene solution is 0.499 m

Explanation:

Density is defined as the ratio of mass and volume of a substance.

[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}} [/tex] ......(1)

Given values:

Volume of carbon tetrachloride = 500 mL

Density of carbon tetrachloride = 1.60 g/mL

Putting values in equation 1, we get:

[tex]\text{Mass of carbon tetrachloride}=(1.60g/mL\times 500mL)=800g[/tex]

Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molarity:

[tex]\text{Molality of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent (in g)}}[/tex] .....(2)

Given values:

Given mass of naphthalene = 51.2 g

Molar mass of naphthalene = 128.17 g/mol

Mass of solvent = 800 g

Putting values in equation 2, we get:

[tex]\text{Molality of naphthalene}=\frac{51.2\times 1000}{128.17\times 800}\\\\\text{Molality of naphthalene}=0.499m[/tex]

Hence, the molality of naphthalene solution is 0.499 m

Answer:

Observes and measure

Explanation:

Answer:

they use tests

Explanation:

they search for evidence using experiments,an experiment is a test to see if their explanation is right or wrong. evidence is made up of observations a scientist makes during an experiment

Answer:

Explanation:

here is your answer:

Answer: The reaction of formation of ions by fluorine and potassium​ is [tex]K^{+} + F^{-} \rightarrow KF[/tex].

Explanation:

Atomic number of potassium is 19 and its electronic distribution is 2, 8, 8, 1. So, in order to attain stability it needs to lose 1 electron due to which it forms [tex]K^{+}[/tex] ion.

Atomic number of fluorine is 9 and its electronic distribution is 2, 7. In order to attain stability it needs to gain one electron and hence forms [tex]F^{-}[/tex] ion.

Therefore, when both these ions come in contact with each other then it leads to the formation of KF compound.

The reaction equation for this is as follows.

[tex]K^{+} + F^{-} \rightarrow KF[/tex]

Thus, we can conclude that the reaction of formation of ions by fluorine and potassium​ is [tex]K^{+} + F^{-} \rightarrow KF[/tex].

Answer:

neutral atoms

Explanation: