The average monthly temperatures for January, April, July, and October in Baltimore, Maryland are graphed below. These averages were calculated from 30 years of data.

Nina predicts that the average temperature in Baltimore will be 68°F next April. Why is her prediction probably wrong?
A.
because the average July temperature is greater than 75°F
B.
because 68°F is much lower than the average April temperature
C.
because 53°F is much lower than the average April temperature
D.
because 68°F is much higher than the average April temperature

Answer:

Mass = 31 g

Explanation:

Given data:

Mass of phosphorus required = ?

Mass of oxygen = 40 g

Solution:

Chemical equation:

4P + 5O₂     →     2P₂O₅

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 40 g/ 32 g/mol

Number of moles = 1.25 mol

Now we will compare the moles of P and oxygen.

                      O₂             :            P

                       5              :            4

                      1.25          :         4/5×1.25 = 1

Mass of phosphorus:

Mass = number of moles × molar mass

Mass = 1 mol × 31 g/mol

Mass = 31 g

Answer:

D

Explanation:

The matter is being conserved because the equal number of atoms of each element in the reactants and products, and the total mass of the reactants is equal to the total mass of the products. Therefore, option (A) is correct.

One or more initial substances change into different substances in any chemical change. Both the initial and final substances are made up of atoms as all matter is made up of atoms.

According to the law of conservation of matter, matter can neither be created nor destroyed, we just can convert it from one form to another. So the same number and kind of atoms before and after the chemical change are present.

According to this law, the total mass of the reactants in a chemical reaction must be equal to the total mass of products for a low-energy thermodynamic process.

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Answer: Sodium chloride ionic , Potassium chloride ionic,  PDB Covalent

Explanation:

Answer:

the correct answer is 2

Explanation:

i just did this assignment :)

There will be 2 unpaired electrons in p orbital of unpaired electrons present in the ground state of the atoms in Group 4A(14).

The unpaired electrons are those which do not have any pair due to absence of no more electrons and they are highly unstable elements if the electrons are not paired in the orbitals.

There are 4 types of orbitals s, p, d, and f s-orbital consist of one pair of electrons to fill and the p-orbital have 3 blocks which can be filled with 3 pair that is 6 electrons after filling, and two unpaired electrons left in p-orbital.

Therefore, in the ground state of the atoms in Group 4A(14)  2 unpaired electrons in the p orbital of unpaired electrons are present.

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Mass of SnF₂ produced : 35.634 g

Reaction

Sn+2HF⇒SnF₂+H₂

mol Sn (Ar 118.710 g/mol) :

[tex]\tt \dfrac{45}{118.710}=0.379[/tex]

mol SnF₂ = mol Sn = 0.379

mass SnF₂ (MW=156.69 g/mol) :

[tex]\tt 0.379\times 156.69=59.39~g[/tex]⇒theoretical

[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\60\%=\dfrac{actual}{59.39}\times 100\%\\\\actual=0.6\times 59.39=35.634~g[/tex]

Answer:

The net ionic question is bel2(aq) + pbso4(aq)

We see these two addends come at both sides of the equation.

It is the answer to this.

Answer:

Test for carbon dioxide gas.

Explanation:

The reaction between baking soda and citric acid will form sodium ions, citric acid ions, carbon dioxide gas, and water. So all you have to do is add the gas produced (by gas displacement method or something) and test whether the gas is carbon dioxide, with lime water or other methods like hydrogencarbonate indicator. Hope this helped!

PLEASE GIVE BRAINLIEST

On mixing citric acid and baking soda a chemical reaction takes place which is indicated by the evolution of carbon dioxide gas .

Chemical reactions are defined as reactions  which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions  like change in color, change in state , change in odor and change in composition . During chemical reaction, there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

There is only one possible value for the quantity "c"

Explanation:

There is only one possible value for the quantity "c". This is because the a,b,c and d represent number of moles in he balanced equation. And since the number of moles of a particular substance (atom or compound) in a balanced equation must be distinct, it (the substance) can only have one value. For example, consider the equation below

2C₂H₂ + 5O₂ ⇒ 4CO₂ + 2H₂O

It can be seen from the above equation that the individual number of moles are distinct and have just one possible value. And if C₂H₂ is A, O₂ is B, CO₂ is C and H₂O is D, then 4 is "c".

Thus, "c" is the number of moles for the substance "C" with just one possible value.

Answer:

(B) II, IV.

hope this answer is helpful for u.

Answer:

Chicken Noodle Soup

Explanation:

The rest do have other things in them but are dissolved unlike the chicken noodle soup.

Hope this Helps!!

:D

Answer

there are to answers one is an answer to a problem or a mixture of chemicals

Explanation:

Answer:

a liquid mixture in which the solute is uniformly distributed within the solvent.

Explanation:

Answer:

0.456

Explanation:

Carbon Dioxide, CO2 0.456

456÷1000=0.456

Answer:

C

Explanation:

It starts with one reactant to give and create new compounds as a product. They need a source of energy that can be heat, light, or electricity to break up chemical bonds.

Answer:

The addition of energy in the form of heat or electricity is often required.

Explanation:

A decomposition reaction is a chemical reaction that starts with single reactants to give new compounds as the products. These reaction requires a source of energy that could be light, heat  or electricity to facilitate the breaking-down of the chemical bonds.

Answer:

Q = 906.882 J

Explanation:

Given data:

Mass of water = 25.5 g

Initial temperature = 14.0 °C

Final temperature = 22.5 °C

Specific heat capacity of water = 4.184 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 22.5 °C - 14.0 °C

ΔT = 8.5 °C

Q = 25.5 g × 4.184 J/g.°C ×  8.5 °C

Q = 906.882 J

Answer:

Ionization energy

Explanation:

Answer:

Yes it is.

Explanation:

If you melted down the sugar, you can clearly use it.

Answer:

Explanation:

Given: 1 dietary Calorie = 1000 calories

           1 calorie = 4.184 Joules

But,

1 dietary Calorie = 1 Kcalorie

                           = 1000 x 4.184 Joules

                           = 4184 Joules

                           = 4.184 KJoules

1 dietary Calories contains 4.184 KJ of energy.

A bottle of Coca cola contains 42 Kcalories; thus,

1 Kcalorie = 1000 calories

                = 4.184 KJoules

Energy = 42 x 1 dietary Calories

            = 42 x 4.184 KJoules

            = 175.728 KJoules

Energy ≅ 176 KJ

So that;

In my bottle of coca cola, there are 176 KJ of energy.

Answer:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

Answer:

It is the electrons that determine the chemical behaviour of a particular element. Isotopes of an element share the same number of protons but have different numbers of neutrons

Answer:

0.02 mol

Explanation:

Given data:

Number of moles of nitrogen = ?

Volume of sample = 400 cm³

Pressure = 790 mmHg

Temperature = 27°C

Solution:

Volume of sample = 400 cm³ (400/1000=0.4 L)

Pressure = 790 mmHg (790/760 = 1.04 atm)

Temperature = 27°C (27+273=300 K)

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

1.04 atm ×0.4 L = n× 0.0821 atm.L/ mol.K  ×300 K

0.416 atm.L =  n× 24.63 atm.L/ mol

n = 0.416 atm.L /24.63 atm.L/ mol

n = 0.02 mol

In sections 1 and 4 the ball is subjected to a balanced force. Hence, option C is correct.

A Frictionless surface refers to that kind of surface where the force acting on any object which makes it difficult for the object to slide is almost zero or negligible, i.e., no resistance between surface or substance allowing the object to slide and move freely without any friction.

In sections 1 and 4 the ball is subjected to a balanced force. Hence, option C is correct.

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Answer:1 and

Explanation:

Answer:

f = 0.67×10¹⁵ s⁻¹

Explanation:

Given data:

Frequency of light = ?

Wavelength = 4.50 ×10⁻⁷ m

Solution:

Formula:

Speed of light = wavelength × frequency

Speed of light = 3×10⁸ m/s

Now we will put the values in formula.

3×10⁸ m/s = 4.50 ×10⁻⁷ m × f

f =  3×10⁸ m/s  / 4.50 ×10⁻⁷ m

f = 0.67×10¹⁵ s⁻¹

Answer:

it will be true

Explanation:

Answer: it is density

Explanation:

Answer:

What do we need to find in that question ?

Answer:

1) no

2)yes

3)no

4)yes

Explanation:

hope that it helped you