please help PLSSSS
2020020200

Answer:

It’s false

Explanation:

it could be true if the question mentioned alkaline solution

Answer:

True

Explanation:

Phenolphthalein is colorless in the presence of an acid and turns pink in the presence of a base.

Answer:

LiOH+CH3COOH=C2H3LiO2+H2O balanced equation

Explanation:

lithium hydroxide-> LiOH

hydrogen acetate->CH3COOH

lithium acetate->C2H3LiO2

water->H2O

LiOH+CH3COOH=C2H3LiO2+H2O

Li=1,O=3,H=5,C=2 --> Li=1,O=3,H=5,C=2

the two sides have same numbers so it is balanced.

Answer:

C(s)+CO₂(g)→2CO(g)

Explanation:

Basically you’re adding the compounds until they’re equal on both sides

Answer: Mutations can cause instant adaptations, while natural selection is the process by which adaptations occurs over a series of generations. Adaptations are changes or processes of changes by which an organism or species becomes better suited for its environment. A mutation is an alteration of the DNA sequence.

Answer:

community

Explanation:

Answer:

The correct answer is population. I took the test and got it right.

Answer:

3.84 kg

Explanation:

CCl4 molar mass: 153.82 g/mol

n = mass / molar mass

25 moles = mass / 153.82 g/mol

mass = 25 x 153.82

mass = 3845 g or 3,84 kg

Answer:

The capillary tube was too close to the bottom of the beaker.

The ruler may have moved.

Water got into the capillary tube.

The temperature was not allowed to equilibrate in the 2-4 minutes.

Explanation:

Answer:

A) Glass

Explanation:

Glass is a conductor, so it allows heat to go through it (Ex. Touching a pie pan that came right out of the oven)

Rubber is an insulator, so heat has a hard time passing through (Ex. Using a rubber grip on a cast iron pan.

Cloth is also an insulator, so heat has a hard time passing through (Ex. Using a pot holder to prevent the counter from getting scarred)

Wood is also an insulator, so heat has a hard time passing through (Ex. Bedding for a rabbit hutch)

Hope this helps!!

Answer:

This chemical equation represents a decomposition reaction. This identification is based on the fact that the single reactant chemical compound breaks down into two different chemical substances that are different from the initial chemical substance.

Explanation:

it was the sample response lol

A reactant is broken down into two or more products in the decomposition reaction. The given reaction is a decomposition reaction.

Decomposition reaction:

In this type of chemical reaction, a reactant is broken down into two or more products.

For example- Ammonium nitrate is broken down into nitrous oxide and water molecules.

[tex]\bold {NH_4NO_3 \rightarrow N_2O + 2H_2O}[/tex]

Therefore, the given reaction is a decomposition reaction.

To know more about Decomposition reaction:

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Answer:

Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere.

Explanation:

The first option clearly expresses the relationship between photosynthesis and cellular respiration.

Cellular respiration releases carbon back into the atmosphere whereas photosynthesis removes the carbon from the atmosphere.

Photosynthesis is the process whereby green plants manufacture their food using carbon dioxide and water.

In cellular respiration, the product of the photosynthesis is used by organisms to produce energy.

Answer:

They will have the same ear shape since their proteins connect in the same ways to determine ear shape.

Explanation:

I majored in Chemistry

Answer:

They will have the same ear shape since their proteins connect in the same ways to determine ear shape.

Explanation:

Explanation:

The reaction given is;

TiCl4 + H2O --> TiO2 + HCl

The reaction is not balanced, upon balancing it is given as;

TiCl4 + 2H2O → TiO2 + 4HCl  

a. How many moles of H2O are needed to react with 6.50 moles of TiCl4?

From the reaction;

1 mol of TiCl4 requires 2 mol of H2O

6.50 mol of TiCl4 would require x mol of H2O

1 = 2

6.5 = x

x = 6.5 * 2 / 1 = 13.0 mol

b. How many moles of HCl are formed when 8.44 moles of TiCl4 react?

From the equation of the reaction;

1 mol of TiCl4 reacts to form 4 mol of HCl

8.44 mol of TiCl4 reacts to form x mol of HCl

1 = 4

8.44 = x

x = 8.44 * 4 / 1 = 33.76 mol

Answer:

1.725e+18

Explanation:

Answer:

Explanation:

4

Answer:

C.  Gas

Explanation:

A supercritical fluid occurs beyond the temperature of  critical point, wherein the state  matter transitions from liquid to gaseous phase interchangeably. Whereas, triple point occurs when all three states of matter: solid, liquid nd gas; coexist.

Hence the answer to the question is Gaseous phase/

I hope you found this helpful.

Answer:

Explanation:

Solution required is .15 M 500 mL sodium fluoride .

molecular weight of sodium fluoride = 42

one mole of sodium fluoride = 42 grams

No of moles contained in the solution of .15M , 500 mL solution

= .15 x 0.5 moles = .075 moles

1 mole = 42 g

.075 moles = .075 x 42 = 3.15 grams .

So mass of sodium fluoride required = 3.15 g .

Answer:

Explanation:

The trick here is to realize that if you know the volume of a gas at STP, you can use the fact that

1

mole of any ideal gas occupies

22.7 L

under STP conditions to calculate how many moles of gas you have in your sample.

Under STP conditions:

1 mole of an ideal gas = 22.7 L

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

In your case, you know that your sample of gas occupies

2.28 L

under STP conditions, which are currently defined as a pressure of

100 kPa

and a temperature of

0

∘

C

.

This means that your sample will contain

2.28

L

⋅

molar volume of a gas at STP



1 mole gas

22.7

L

=

0.10044 moles gas

Now, the molar mass of the gas is the mass of exactly

1

mole of the gas. In your case, you know that you get

3.78 g

for every

0.10044

moles, which means that you have

1

mole

⋅

3.78 g

0.10044

moles

=

37.6 g

Since this is the mass of

1

mole of gas, you can say that the molar mass of the gas is

molar mass = 37.6 g mol

−

1

−−−−−−−−−−−−−−−−−−−−−−−

% yield = 80.719

Given

22.0 g of Mgl₂

25.0 g of Mg

25.0 g of l₂

Required

The percent yield

Solution

Reaction

Mg + I₂⇒ MgI₂

mol Mg = 25 g : 24.305 g/mol = 1.029

mol I₂ = 25 g : 253.809 g/mol = 0.098

Limiting reactant = I₂

Excess reactant = Mg

mol MgI₂ based on I₂, so mol MgI₂ = 0.098

Mass MgI₂ (theoretical):

= mol x MW

= 0.098 x 278.114

= 27.255 g

% yield = (actual/theoretical) x 100%

% yield = (22 / 27.255) x 100%

% yield = 80.719

Answer:

Explanation:

1 mole of oranges contains 6.02 x1023 oranges. 1 mole of helium gas contains 6.02 x1023 helium atoms. 1 mole of water contains 6.02 x1023 water molecules.

...

Answer:

25194.56

Explanation:

You'll  need a scientifuc calculator

2.91*10^22*1 = 2.91E22

2.91E22-/6.02*10^23=25194.56

6.02*10^22 Is the Mole number

Answer:

K = 351.3

Explanation:

The relationship between the Celsius scale and kelvin scale is;

K = 273 + C

Since the Celsius temperature = 78.3

The kelvin temperature is given as;

K = 273  + 78.3

K = 351.3

Answer:

Electrons

Explanation:

Answer:

Electrons are not found in the nucleus for they are orbiting the atom.

Answer:

An initial velocity that is faster than a final velocity

Explanation:

The relationship between velocity and acceleration is given as follow;

Acceleration = Change in velocity / Time

Change in Velocity = Final Velocity - Initial Velocity

From the formular, time is not able to affect the sign of the acceleration.

A negative acceleration is also referred to as deceleration and this occurs when there is a drop in velocity.

A drop in velocity occurs when the initial velocity is faster than the final velocity.

Answer:

C. NH₄Cl

Explanation:

The compound with the element ratio 1 : 4 : 1 from the given choices is NH₄Cl.

An element is a pure substance made up of distinct number of atoms. Elements are unique and are different from other elements because of the nature of their atoms.

We often delineate an element using chemical symbols.

   In the compound NH₄Cl;

There are 3 elements:

           Number of atoms

N                      1

H                      4

Cl                     1

Answer: B

Explanation: A fluorine atom has nine protons and nine electrons, so it is electrically neutral. (neutral =0)

The nucleus of a fluorine atom has a charge of zero as the atom has equal number of positive and negative charges.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

Learn more about atom,here:

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Answer:

See explanation

Explanation:

We know that surface area is an important determinant factor in the study of reaction rate. This is the reason why finely divided marble chips react faster than lumps of marble in the reaction between marble chips and dilute HCl.

Now imagine that i have a lump of marble and i have finely divided marble. Then i also have a solution of 0.5 M dilute HCl. If i introduce 1g of the lump  of marble into 250 ml solution of the 0.5 M HCl in one beaker and introduce 1g of finely divided marble into another 250 ml solution of 0.5 M HCl in a separate beaker, we will notice that the finely divided marble chips reacts faster as evidenced by the quicker effervescence of CO2 gas from the later compared to the former.

Hence, smaller marble chips reacts faster with dilute HCl than a lump of marble.

Answer:

yes the above given answer is absolutely correct I agree with u man on the above.

Answer:

32.06 grams

Explanation:

One mole of sulfur is equal to 32.06 grams of sulfur.

Answer:ok

Explanatio

heres the answer 32.065 grams because 1 mole is equal to 1 moles Sulfur

Answer: The state of maater for HgBr is solid.

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.  

The balanced chemical equation is:

[tex]HgNO_3(aq)+KBr(aq)\rightarrow HgBr(s)+KNO_3(aq)[/tex]