46.0 mL sample of gas at 28.0°C and 748 torr. What volume would this gas
sample occupy at stp?

Answers

Answer 1

Answer:

2

Explanation:


Related Questions

Which part of the body transports molecules from food and air to the cells of the body

Answers

Answer:

Molecules from food and molecules of oxygen move from the mouth and the nose to cells of the body through a series of blood vessels, including veins, arteries, and microscopically small blood vessels (capillaries), that extend throughout the body.

Explanation: This is right

Answer: blood

Explanation: The circulatory system delivers oxygen and nutrients to cells and takes away wastes. The heart pumps oxygenated and deoxygenated blood on different sides. The types of blood vessels include arteries, capillaries and veins.

Why is it important for some skateboarding ramps to be tall? Use the terms "potential energy" and "kinetic energy" in your answer. plsssssss help meeee Plzzz in kids words

Answers

Answer: Taller means longer legs which means easier to pop tricks higher. Shorter people have a lower center of gravity. Taller people have a higher one. A lot of skateboarding tricks depend on the center of gravity.

Explanation:

Yw ❤

Shorter people have a lower center of gravity. Taller people have a higher center of gravity. A lot of skateboarding tricks depend on the center of gravity.

What is kinetic energy?

Kinetic energy is a form of energy it possess when any object or person is in motion . It can be defined as the work needed to be done to produce a motion in a object from rest position.

If we want to acceleration in an object then we must apply a force on a object to give  motion so we can say that we required to do work for acceleration and then we can say that required is equal to kinetic energy.

Mathematically

Kinetic energy =1/2mv^2

Where

m = mass of object.

v = velocity of object

Kinetic energy is vector quantity it means that it have both i.e magnitude and vector.

S.I unit of Kinetic energy is Joule.

Therefore, Shorter people have a lower center of gravity. Taller people have a higher center of gravity. A lot of skateboarding tricks depend on the center of gravity.

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Why glucose (monosaccharide) and maltose (disaccharide) give positive Benedict test?

Answers

Answer:

please give me brainlist and follow

Explanation:

Substance in water + 3 mL Benedict's solution, then boil for few minutes and allow to cool. The common disaccharides lactose and maltose are directly detected by Benedict's reagent because each contains a glucose with a free reducing aldehyde moiety after isomerization.

Glucose and maltose give a positive Benedict test because they have a free carbonyl group to undergo oxidation.

Explanation:

The monosaccharides are sugars that cannot be further hydrolyzed into simpler sugars like glucose, fructose, ma, etc.The disaccharides are sugars that on hydrolysis give two monosaccharide units like sucrose, lactose, maltose, etc.The polysaccharides are sugars that on hydrolysis give more than two monosaccharide units like sucrose, lactose, maltose, etc.Reducing sugars are which have a free carbonyl group that oxidizes into a carboxylic acid and reduces Benedict reagent like glucose, maltose, etc.Non-reducing sugars which don't have a free carbonyl group like sucrose, all polysaccharides, etc.Benedict test is a chemical test performed to test the presence of reducing sugars.The Benedict reagent is a complex made up of sodium citrate, sodium carbonate, and copper sulfate pentahydrate.The positive test for reducing sugar will be the red coloration of the solution due to the formation of copper(II) oxide.

So, from this, we can conclude that glucose and maltose give a positive Benedict test because they have a free carbonyl group to undergo oxidation.

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how many moles are 20 grams of Helium ? ​

Answers

Answer: The correct answer is 5.00 moles

Explanation:

HELP!

The law of conservation of energy states:

A. Energy increases exponentially with times

B. Total energy decreases due to energy output.

C. Energy cannot be created or destroyed.

D. Energy always remains in the same form.

Answers

Answer:

C

Explanation:

energy cannot be created or destroyed like solar energy for instance. it is already energy because it comes from the sun and for other reason.

Hope this helps!

what is the first element in the periodic table?

Answers

Hydrogen is the first element in the periodic table level 1. Can be found on the top left

Answer:

the first element on the table is Hydrogen

assign an oxidation number to each element in the following species. H2O​

Answers

Answer:

the oxidation number of hydrogen is +2, while oxygen is -2

Fill in the missing information:

1. Complete Nuclear Symbol ________
2. Atomic # ________
3. Mass number ________
# Protons 22
# Electrons 18
# Neutrons 26
4. Charge _________

Answers

Answer: 1. Complete Nuclear Symbol : [tex]_{22}^{48}{Ti^{4+}}[/tex]

2. Atomic number : 22

3. Mass number : 48  

4. Charge : 4 +

Explanation:

Atomic number is equal to the number of protons.

Mass number is the sum of number of neelectrons. utrons and number of protons.

Given : no of protons = 22 , thus atomic number = 22

Mass number =  number of neutrons + number of protons

Mass number =  26 + 22 = 48

Also for a neutral atom , the number of protons is equal to the number of electrons. But here electrons are 4 less than protons, which means the atom has lost 4 electrons and thus will have a charge of 4+.

The atomic number is specific to an element, and the element with atomic number 22 is Titanium (Ti). The representation is [tex]_{22}^{48}{Ti^{4+}}[/tex]

Litmus is an example of an indicator, a substance that changes color depending on its pH.

a. True
b. False

Answers

True litmus paper can determine pH

based on their scientific names, you know the cats felis catus and felis bieti do not belong to the same

A. family
B. species
C. zoo
D. domain ​

Answers

In an ecosystem, based on their scientific names, you know the cats felis catus and felis bieti do not belong to the same species.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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A 5.00 g piece of metal is heated to 100.0 C then placed in a beaker containing 20.0 g of water at 10.0 C. The temperature of the water rises to 15.0 C. Calculate the specific heat of the metal

Answers

Calculate the heat gained by the water first.

q = mCpΔT
m = 20.0 g
Cp = 4.186 J/g°C
ΔT = T(final) - T(initial) = 15.0°C - 10.0°C = 5.0°C

q = (20.0)(4.186)(5.0) = 419 J

This is equal to the heat lost by the metal, so calculate Cp for the metal, given:
q = -419 J (negative because heat was lost)
m = 5.00 g
ΔT = 15.0°C - 100.0°C = -85.0°C (negative because the temperature decreased)

q = mCpΔT —> Solve for Cp —> Cp = q/mΔT

Cp = -419 / (5.00 • -85.0) = 0.986 J/g°C

how do I do this I’m confused

Answers

by using pro.gram..

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[tex]{\huge{\pink{\underline{\underline{❑❑❑❑❑❑❑❑❑~}}}}}[/tex]

[tex]{\huge{\orange{\underline{\underline{﹌﹌﹌﹌﹌﹌﹌﹌﹌♪}}}}}[/tex]

[tex]{\huge{\purple{\underline{\underline{✎﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏}}}}}[/tex]

How many grams of solid NaOH are needed to prepare 200. mL of a 5.00% by
volume NaOH solution

A) 8
B) 10
C) 9
D) 7

Answers

Answer:

10

Explanation:

Each 100 ml should have 5 solid naom to have 5%,

For 200 ml: 200 *5%=10

The grams of Solid NaOH needed is : ( B )  10 grams

Volume of solution = 200 mL

Percentage of solid NaOH in solution = 5.0%

Therefore the grams of solid NaOH required to prepare a 200mL solution that contains 5.0% solid will be :

5% * 200 mL

= 10 grams

Hence we can conclude that the grams of solid NaOH needed is 10 grams

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Aqueous hydrochloric acid HCl will react with solid sodium hydroxide NaOH to produce aqueous sodium chloride NaCl and liquid water H2O. Suppose 15.7 g of hydrochloric acid is mixed with 27. g of sodium hydroxide. Calculate the maximum mass of sodium chloride that could be produced by the chemical reaction.

Answers

Answer:

25.155 gram

Explanation:

HCl(aq.) + NaOH(aq.) ⇒ NaCl + H2O

According the above equation equal number of moles of reactant are producing same number of moles of products.

Now, no. mole of HCl = 15.7/(1+35.5) = 0.43 moles

no. of moles of NaOH = 27/(23+16+1) = 0.675 moles

Since  the  amount  of  sodium  hydroxide  exceeds  the  amount  of  hydrochloric  acid,  the maximum amount of each substance participating in the reaction is HClν ν  0.43 moles .Therefore, the maximum amount of NaCl  that can be produced is as follow

= (23+35.5)×0.43 = 25.155 gram

5. Choose the best description of a reversible reaction.
a reaction that occurs in both directions at the same time
a reaction that has used up all the reactants and has stopped
a reaction that can only proceed to the right
a reaction that can only proceed to the left

Answers

Answer:

A reaction that can only move towards the right.

Explanation:

For a reversible reaction when one of the products of the reaction is removed the reaction moves towards right hand side. More and more reactants will be converted into products. This will nullify the effect of removal of product.





Which do all cells need in order to function?

oxygen

water

carbon dioxide

offspring

Answers

Answer:

oxygen is the correct answer

Explanation:

you need oxygen in order to breath, eat, drink, and many other stuf! hope i helped!

Is that flirting? I'm not sure and I really need to know-

Answers

Answer:

I mean ig it is, but i dk

Explanation:

Help!!
Which of the following tends to have increased solubility from increased pressure?
A gas in a liquid.
a liquid in a solid.
a solid in a gas.
A solid in a liquid.

Answers

Answer:

a solid in a gas

Explaination:

because soild will take a long while to dissolve into liquid by heating the soild with gas it will disslove quicker

The worst feeling is when you are hurting so badly inside but not a single tear comes out.

Anyone relate?
I know i can.

Answers

Answer:

chemistry wow

Explanation:

Determine the number of atoms in 3.14 g gold

Answers

The answer for sure is 95.99922

Please please help me

Answers

Answer:

I agree with Omar because it depends on what the charge of the object and magnet is. If the magnet is negative and the object is positive, they will pull together. If the magnet is negative and the object is negative then they will pull apart.

Explanation:

Mark the first guy Brainliest he got it right

Gallium (Ga, 69.723 g/mol) is a metalloid obtained from its salts during the smelting of ores of other elements, like Zinc, Ga has broad applicability in the electronics industry. It is also used as a safe replacement for mercury in thermometers as it melts at 29.8 oC and has a heat of fusion of 5.59 kJ/mol. What is the entropy change of of gallium in as it melts when placed on a surface at 29.8 oC?

Answers

Answer:

4.255 J/ K

Explanation:

Given data :

mass of Gallium = 16 gm

molar mass = 69.723 g/mol

hence no of moles = 16 / 69.723 = 0.23 moles --------- ( 1 )

Δh ( heat fusion ) = 5.59 KJ/mol

Temperature = 29.8°C = 302.8 k

Determine the entropy change of gallium

Δs ( entropy change ) =  heat fusion / temperature

     = ( 5.59 * 1000) J/mol / 302.8 = 18.46 J/k*mol

Hence entropy change of gallium

= Δs * no of Gallium moles

= 18.46 * 0.23 = 4.255 J/ K

What is the pH of a 0.08 M solution of Ca(OH),?

Answers

Answer:

pH = 12.20

Explanation:

Ca(OH)2 is a strong base, so it dissociates completely. A 0.08 M solution of Ca(OH)2 is 0.16 M OH-, since every mole of Ca(OH)2 has 2 OH-.

Calculate pOH using [OH-] = 0.16 M

pOH = -log(0.16) = 0.80

pH = 14 - pOH = 14 - 0.80 = 12.20

Taking into account the definition of pH and pOH, the pH of a 0.08 M solution of Ca(OH)₂ is 13.21

pH

First of all, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

pOH

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

Relationship between pH and pOH

The following relationship can be established between pH and pOH:

pOH + pH= 14

This case

A strong base is one that dissociates completely in water, that is, it contributes the maximum number of OH- ions.

Ca(OH)₂ is a strong base that for each Ca²⁺ cation there are two OH⁻ anions and in which for each mole of Ca(OH)₂ two moles of OH⁻ are formed.

So: [OH⁻]= 2×[Ca(OH)₂]

[OH⁻]= 2×0.08 M

[OH⁻]= 0.16 M

Replacing in the definition of pOH:

pOH= - log (0.16 M)

Solving:

pOH= 0.79

Finally, considering the relationship between pH and pOH:

0.79 + pH= 14

pH= 14 - 0.79

pH= 13.21

In summary, the pH of a 0.08 M solution of Ca(OH)₂ is 13.21

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Which of the following is the best way to make a conclusion?
A. The experiment must be manipulated until the results show what you want
B. Estimate results to where they should be
C. Choosing the results you like
D. Comparing data from the experiment to the prediction of the hypothesis

Answers

The answer is D. Comparing data from the experiment to the prediction of the hypothesis.

14. Explain, in terms of ions, why a 10.0-milliliter sample of 0.10 M NH4Cl(aq) is a poorer conductor of
electricity than a 10.0-milliliter sample of the 0.30 M NH4Cl(aq).
Neeed now

Answers

Ionic compounds conduct electricity when dissolved in water, because the free-floating ions can carry charge. The more ions you have, the more readily the solution will carry that charge. 10.0 mL of 0.10 M NH4Cl has only 0.001 mol of NH4+ and 0.001 mol of Cl-, whereas 10.0 mL of 0.30 NH4Cl has 0.003 mol of NH4+ and 0.003 mol of Cl-. The 0.10 M sample is a poorer conducted of electricity because it has less ions in solution.

Calculate the molarity of a MgSO: solution
prepared by adding 0.37 moles of MgSO, to
enough water to make 4.9 L of solution.
Answer in umits of M.

Answers

Answer:

is

Explanation:

the explant

How many moles of titanium are in a sample containing 2.8 x 10^24 atoms?

1) 1.69 x 10^48
2) 4.65 x 10^43
3) 4.65
4) 0.0465
5) 48

Answers

Answer:

4.65 moles

Explanation:

To calculate this, we can use Avogradro's Number: 6.022*10^23

[tex]2.8*10^2^4*\frac{1mole}{6.022*10^2^3} =4.65mol[/tex]

So, there are 4.65 moles in 2.8*10^24 atoms of Ti

Which two substances are covalent compounds?
A. C6H12O6(s) and KI(s)
B. C6H1206(s) and HCl(g)
C. KI(S) and NaCl(s)
D. NaCl(s) and HCl(g)

Answers

Answer:

Option B is correct: C6H1206(s) and HCl(g)

send a pic of the question

Answers

your photo is blank?

How many moles of Ag can be obtained from 2.77 moles Cu using the following
balanced reaction?
2AgNO3
+ Cu
Cu(NO3)2
+ 2Ag

Answers

Answer:

2.77×2= 5.4 mol Ag can be obtained

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