CHEMISTRY MIDDLE SCHOOL

4 Mg(OH) 2
How many atoms

Answers

Answer 1
Answer:

six. you add the number of atoms for both of the elements ei: H2O has to 3 atoms because 2+1 =3


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HIGH SCHOOL

How can you make a solution saturated? A.Add more solvent
B.Add more solute
C.Add more solution
D.Decrease the concentration

Answers

You can make a solution saturated by Adding more solute. Hope this helps, good luck. 
Your answer is solute. ik this cause i just took the test for all of u future people who need this answer. peace
MIDDLE SCHOOL

Find the midpoint of a segment with endpoints of 4-3i and -2+7i​

Answers

Answer:

1+2i

Explanation:

Let the two complex numbers in the question to be as shown below,

a + bi = 4 − 3i and s + ti = -2 + 7i.

Apply the Midpoint Formula for the 2 complex numbers which are a + bi and s + ti is:

Applying values as:

Hence, the midpoint is 1+2i

Answer:

1+2i

Explanation:

MIDDLE SCHOOL

A graduated cylinder with a mass of 105.56 g has 45.4 mL of a certain liquid added to it. The mass of the cylinder and the liquid is 144.95 g. What is the density of this liquid?

Answers

Answer:

The density of liquid is 0.87 g / mL.

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

Volume of liquid = 45.4 mL

Mass of graduated cylinder = 105.56 g

Mass of graduated cylinder + liquid = 144.95 g

Mass of liquid = 144.95 g -  105.56 g =39.39 g

Density = ?

Formula:

d = m/ v

d = 39.39 g / 45.4 mL

d = 0.87 g / mL

The density of liquid is 0.87 g / mL.

HIGH SCHOOL

Ap chemistry how to determine if compound is ionic or molecular bqsed on formula

Answers

Ionic compound consists of a positively charged ion and a negatively charged anion. For example, NaCl. Na (sodium) is a cation (another word for positively charged ion) and Cl (chloride) is a anion (another way for negatively charged ion.)

Molecular compounds consists of only negatively charged ions. For example Br2I is a compound of 2 elements that are negatively charged.

Unlike ionic compounds, molecular compounds consists of two or more negatively charged elements.  
HIGH SCHOOL

Ornithine serves three metabolically important roles, but is not found in proteins. What is one of the important roles of ornithine? a. amine donor for many transamination reactions
b. an intermediate in the urea cycle
c. involved in the synthesis of serine, which serves as a precursor for glycine and cysteine
d. its reaction with methenyl tetrahydrofolate produces lysine
e. none of the above

Answers

Answer:

b. an intermediate in the urea cycle

Explanation:

Ornithine is a non-essential amino acid which is produced as intermediate molecule in urea cycle.

Ornithine also plays important role in regulation of several metabolic processes which leads to diseases like hyperammonemia, hyperorithinemia and cancer in the body of humans.

Role in the urea cycle:

Ornithine is a products of action of enzyme arginase on l-arginine which is responsible for the formation of urea. Thus, ornithine is a central part of the urea cycle and allows for disposal of the excess amount of nitrogen.

HIGH SCHOOL

Describe a sigma bond.a. orbital overlapping with the side of a p orbitalb. overlap of two d orbitalsend to end overlap of p orbitalc. sp orbital overlapping with an f orbitald. side by side overlap of d orbitals

Answers

Answer:

B. overlap of two d orbitals end to end overlap of p orbital.

Explanation:

Sigma bonds are the strongest type of bonds and they are covalent which is due to the direct or end to end overlap of orbitals. The symbol σ is used to adequately describe the bond that exists in a molecule.

In organic molecules, a single C-C bond is a sigma bond while a multiple C-C bond is composed of one sigma bond together with pi or other bonds that is a double bond has one sigma plus one pi bond, and a triple bond has one sigma plus two pi bonds.

Examples include: s-s orbital, pz-pz orbitals, dz-dz orbital and hybrids like sp-p etc.

MIDDLE SCHOOL

1 Point What is the temperature in kelvins of 23°C?
O A. 11.9K
O B. 6279K
OC. 296K
O D. 250k

Answers

Answer:

Option C. 296K

Explanation:

T°C = 23°C

To covert the above to Kelvin temperature, use the following equation

T(K) = T°C + 273

T(K) = 23 + 273

T(K) = 296K

HIGH SCHOOL

In a neutralization reaction, how many moles of hclo4 react with 1 mole of al(oh)3?

Answers

Write the balanced chemical equation:

3 HClO4 + Al(OH)3 ---> Al (ClO4)3 + 3H2O

So, the molar ratios of the reactants are: 3 moles HClO4 : 1 mol Al (OH3)

And the answer is that, in a neutralization reaction, 3 moles of HClO4 react with 1 mol Al (OH)3.

Answer:

3 moles of HClO₄ is required to neutralize 1 mole Al(OH)₃.

Explanation:

The neutralization reaction between HClO₄and Al(OH)₃is as follows:

HClO₄ + Al(OH)₃ -> Al(ClO₄)₃ + H₂O

The balanced reaction is as follows:

3HClO₄ + Al(OH)₃ -> Al(ClO₄)₃ + 3H₂O

Based on the balanced molecular equation the molar ratio of HClO₄ : Al(OH)₃ is 3:1.  

So 3 moles of HClO₄ is required to neutralize 1 mole Al(OH)₃.  

MIDDLE SCHOOL

PH is 7.45. Calculate value of [H3O+] and [OH-]

Answers

Answer:

The answer is (H30+) =3,55e-8M and (OH-)=2,82e-7M

Explanation:

We use the formulas:

pH= - log(H30+)  and Kwater=(H30+)x(OH-)

pH= - log(H30+)  ----< (H30+)= antilog- pH=antilog- 7,45=3,55E-8M

Kwater=(H30+)x(OH-)

(OH-)=Kwater/(H30+)= 1,00e-14/3,55e-8 = 2,82e-7

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