Chemistry College

i need help please help me now please

Answers

Answer 1

The answer is C, balanced

Related Questions

Match the descriptions below with the graphs. Be sure to explain your answers.

Answers

There are no graphs

calulate the molarity
The first solution contains 0.600 mol of NaOH in 2.10 L of solution.
The second solution contains 10.3 g of NaCl in 675 mL of solution.

Answers

1) 0.286 M NaOH
2) 0.261 M NaCl
Hope this helps :)

Solid sodium is reacted with chlorine gas and a crystalline solid was formed. The crystalline solid is evidence that
A. The sodium was broken down into tiny pieces by the chlorine.
B. The reaction caused impurities to fall out.
C. Elements bond in a multitude of ways to make compounds.
D. The chlorine solidified.

Answers

Answer:

C. Elements bond in a multitude of ways to make compounds.

Complete each statement by choosing the correct answer from the drop-down menu.

are the types of muscle tissue found in the human body.
Muscle cells are specialized to

are the two specialized proteins found in muscle.Muscle Tissue

Answers

Answer:

smooth, skeletal, cardiac

contract

actin and myosin

Explanation:

edge

Answer:

The correct answers are

smooth, skeletal, cardiac

contract

actin and myosin

Determine the mass defect for the following atom. The mass of a 20 Ne atom is 19.992 44 amu.

Answers

Answer:

I will not consider electronic mass here. We know (the masses should have been provided in the question!) that the neutron mass is

1.008701

⋅

amu

and the proton mass is

1.007316

⋅

amu

Explanation:

Question answered

How many elements are shown in the diagram below for Hydrogen Peroxide?

Ten
Seven
Four
Two

Answers

Answer:4

Explanation:

When two or more different elements unite chemically, they form a

A) compound
B) mixture
C) metalloid
D) solution

Answers

Answer:

compound ahhhhhhhhhhhhhgh

A element is having atomic number 82. find the number of its protons and electrons

Answers

Answer:

The number of its protons and electrons are 82 each

Explanation:

Atomic no of an element = 82

Atomic no = No of protons

⇒ No of protons = 82

Electrons are negatively charged particle and Protons are positively charged particles.

No of electrons = 82

Hence, the element is Lead with 82 protons and electrons

2. Using the following data, calculate the average atomic mass of magnesium (give your answer to the nearest
.01 ) : Show all work!
Isotope: Mg Percent abundance: 78.70%
24
Isotope: 'Mg Percent abundance: 10.13% 25
Isotope: Mg Percent abundance: 11.17% 26

Answers

Answer: 24.309amu

Explanation:

5. Explain why the particle diagram below represents a chemical change.
plsss help!!!

Answers

Answer:

the atoms are rearranged

Explanation:

they are just in a diff order

The particle diagram represents a chemical change because the breaking of old chemical bonds and the formation of new chemical bonds occurs and a completely new substance is formed.

What is the chemical change?

A chemical change is when a chemical substance is completely transformed into one or more different types of substances. Chemical changes occur through chemical reactions and result in substances with different and new chemical and physical properties.

Chemical changes are irreversible in nature and are also known as permanent changes. When chemical responses occur, the molecules are modified and joined by an energy change as new molecules are produced.

Examples of chemical changes: burning of coal, rusting of iron, digestion of food, adding vinegar to baking soda, germination of seeds, ripening of fruits, cooking an egg, etc.

The given diagram is quite similar to the water formation reaction:

2H₂ + O₂ [tex]\longrightarrow[/tex] 2H₂ O

In which the bond between the hydrogen atoms and oxygen atoms is broken and the formation of the O-H bond, therefore, is a chemical change.

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If the titration of 0.8094 g of 100% pure
KHP requires 40.25 mL of NaOH, what
is the concentration of the NaOH
solution? Remember KHP is potassium
hydrogen phthalate, KHC2H4O4. Show
this calculation in your lab notebook.

Answers

Answer:

Explanation:

molecular weight of potassium hydrogen phthalate = 204

.8094 g of KHP = .8094 / 204 = 3.967 x 10⁻³ moles

3.967 x 10⁻³ moles of KHP must have reacted with 3.967 x 10⁻³ moles of NaOH

concentration of NaOH = 3.967 x 10⁻³ / 40.25 x 10⁻³

= .098 M .

What are the four main types of tissues in the human body?

Answers

connective tissue, epithelial tissue, muscle tissue, and nervous tissue.

Answer:

epithelial tissue, connective tissue, muscle tissue, and nerve tissue

Explanation:

What is the velocity of a wave?

A. How much energy the wave has
B. How quickly the wave travels
C. The distance between two wave peaks
D. The distance between the high and low points of the wave

Answers

The answer is b. How quickly the wave travels

Can someone explation for me ? I can’t understand.
Thanks

Answers

Answer:

2 Nitrogen

Explanation:

This is because it says Diammonium Hydrogen Phosphate. Here. (NH4)3PO4 is one way to write this. However, another way to write this is (NH4)2HPO4. There should be in fact two ammonium groups, NH4 and 1 Hydrogen to get 3+ charge to balance the 3- charge from the Phosphate.

What is the frequency of a photon of light (in Hz) that has an energy of 2.50 x 10-18 J?

Answers

Answer:

The answer is

[tex]3.77 \times {10}^{15} \: \: \: Hz[/tex]

Explanation:

The frequency of the photon can be found by using the formula

[tex]f = \frac{E}{h} \\ [/tex]

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question

E = 2.50 × 10^-18 J

So we have

[tex]f = \frac{2.50 \times {10}^{ - 18} }{6.626 \times {10}^{ - 34} } \\ [/tex]

We have the final answer as

[tex]3.77 \times {10}^{15} \: \: \: Hz[/tex]

Hope this helps you

A sample of a metal has a mass of 23.4 g and a volume of 3.0 mL. What is the sample’s most likely identity?
A. Aluminum (2.8 g/mL)
B. Iron (7.8 g/mL)
C. Copper (8.9 g/mL)
D. Gold (19.3 g/mL)

Answers

Answer:

B. Iron (7.8 g/mL)

Explanation:

23.4/3 = 7.8

7.8g/mL

The identity of a sample of a metal that has a mass of 23.4 g and a volume of 3.0 mL is iron with a density of 7.8g/mL.

How to calculate density?

The density of a substance can be calculated by dividing the mass of the substance by its volume. That is;

Density = mass (g) ÷ volume (mL)

According to this question, a sample of a metal has a mass of 23.4 g and a volume of 3.0 mL. The density of the metal is as follows:

Density = 23.4g ÷ 3mL

Density = 7.8g/mL

Therefore, the identity of a sample of a metal that has a mass of 23.4 g and a volume of 3.0 mL is iron with a density of 7.8g/mL.

Learn more about density at: https://brainly.com/question/21667661

Which of the elements listed below would
require the least amount of energy to remove an
electron?
Beryllium
Calcium
Lithium
Sodium?

Answers

Answer:

Lithium would require the least amount of energy to remove an electron

Answer:

The answer is actually sodium

Explanation:

Lithium actually requires more than sodium.

Tobacco use: The _____ _______ cause of ______ death

Answers

Answer:

Tobacco use: The most preventable cause of cancer death

Explanation:

cancer might not be right

a typical baseball has a mass of 350g and takes up a volume of .780L. what is the density of a baseball in g/l and g/ml?

Answers

Answer:

449 g/L

0.449 g/mL

Explanation:

Step 1: Given data

Mass of a typical baseball (m): 350 gVolume of a typical baseball (V): 0.780 L

Step 2: Calculate the density (ρ) of the baseball in g/L

The density is equal to the quotient between the mass and the volume.

ρ = m / V

ρ = 350 g / 0.780 L

ρ =449 g/L

Step 3: Convert ρ from "g/L" to "g/mL"

We will use the conversion factor 1 L = 1000 mL.

449 g/L × (1 L/1000 mL) = 0.449 g/mL

How would a descriptive model of Earth's layers be categorized?
a. abstract model
b. prototype model
c. concrete model
d. conceptual model

Answers

It’s b hope that helped

A descriptive model of Earth's layers can be categorized as prototype model. Hence, option B is correct.

What is a descriptive model?

A descriptive model describes a system or other entity and its relationship to its environment.

The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.

The outermost solid layer of a rocky planet or natural satellite. Chemically distinct from the underlying mantle.

Hence, option B is correct.

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QUESTION 1
Consider the following reaction: CH4 + 202 --> 2H2O + CO2
How many moles of water can be formed from 1.1 moles of CH4?

Answers

Answer: 2.2 mols H2O
Explanation: This one is a lot easier than it seems! All you have to do is multiply 1.1 by the mole ratio(look at the coefficients)

WILL mark Brainliest

Answers

Answer:

Ok what question

Explanation:

uhh what question do you need help with?

what is the chemical formula for the magnesium ion and the carbonate ion?

Answers

Answer: The formula for magnesium carbonate is MgCO_3.

Explanation:

The circular flow model interacts between which sectors of the economy? Select THREE answers.

Private

Government

Foreign

Tech

Households

Answers

Answer:

2,3,5

Explanation:

Identify the placement of items A-E using the drop-down menus.

A)
⇒No
⇒Yes

B)
⇒No
⇒Yes, when liquid or solution
⇒Yes, when solid

C)
⇒No
⇒Yes

D)
⇒No
⇒Yes

E)
⇒No
⇒Yes

Answers

Answer:

A=no

B= yes when liquid or solution

C=yes

D=no

E=yes

Explanation:

According to the given table, the placement of items A-E are

A) ⇒ No

B) ⇒Yes, when liquid or solution

C) ⇒Yes

D) ⇒No

E) ⇒Yes

What is conductivity and Malleability?

Malleability - Those metals that can be beaten into thin sheets with a hammer or any heavy object. For example - Cu, Au etc

Conductivity - Conductivity is the measure of the ease at which an electric charge or heat can pass through a material. For example - Metals are good conductors of heat and electrolytic solution is conductors of electricity.

Therefore, according to the given table, the placement of items A-E are

A) ⇒ No

B) ⇒Yes, when liquid or solution

C) ⇒Yes

D) ⇒No

E) ⇒Yes

Learn more about Malleability and conductivity, here:

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Which of the following compounds is the MOST polar?

H−Br

H−F

H−Cl

H−I

Answers

H-F because it has the largest difference in electronegativity which is 2, so it’s the most polar.

Distinguishing solutions and colloids

Which techniques would be best for separating the solute from the solvent in a solution ?

Answers

Answer:

Distillation will be the best method for the separation of solute from the solvent in a solution.

Explanation:

10. What are the upper and lower extremes of
the moisture content of wood?

Answers

The acceptable moisture levels of wood and lumber are in the range of 6% to 8% for interior and 9% to 14% for exterior wood or for building envelope components within constructed assemblies.

PLEASE HELP ASAP‼️ Which of the following elements has the highest metallic character
A. Zt
B. Rh
C. Hf
D. Co

Answers

Answer: C

Explanation:

As part of a soil analysis on a plot of land, a scientist wants to determine the ammonium content using gravimetric analysis with sodium tetraphenylborate, Na+B(C6H5)−4. Unfortunately, the amount of potassium, which also precipitates with sodium tetraphenylborate, is non‑negligible and must be accounted for in the analysis. Assume that all potassium in the soil is present as K2CO3 and all ammonium is present as NH4Cl.
A 5.025 g soil sample was dissolved to give 0.500 L of solution. A 100.0 mL aliquot was acidified and excess sodium tetraphenylborate was added to precipitate both K+ K + and NH+4 ions completely.
Compound Formula mass
B(C6H5)−4+K+⟶KB(C6H5)4(s) KB(C6H5)4 358.33 g/mol
B(C6H5)−4+NH+4⟶NH4B(C6H5)4(s) NH4B(C6H5)4 337.27 g/mol
K2CO3 138.21 g/mol
NH4Cl 53.492 g/mol
The resulting precipitate amounted to 0.277 g. A new 200.0 mL aliquot of the original solution was made alkaline and heated to remove all of the NH+4 as NH3. The resulting solution was then acidified, and excess sodium tetraphenylborate was added to give 0.105 g of precipitate.
Find the mass percentages of NH4Cl and K2CO3 in the original solid.
______ %NH4CL
______ %K2CO3

Answers

Answer:

Mass percentage of NH₄Cl = 3.54%

Mass percentage of K₂CO₃ = 1.01%

Explanation:

If a 200.0 mL aliquot produced 0.105 g of KB(C₆H₅)₄, then a 100.0 mL aliquot would produce 1/2 * 0.105 g = 0.0525 g of KB(C₆H₅)₄.

Therefore, mass of NH₄B(C₆H₅)₄ in the 100.0 ml aliquot = (0.277 - 0.0525)g = 0.2245 g

Number of moles of NH₄B(C₆H₅)₄ in 0.2245 g = 0.2245 g/ 337.27 g/mol = 0.0006656 moles

In 500 ml solution, number of moles present = 0.0006656 * 500/100 = 0.003328 moles.

From equation of the reaction; mole ratio of NH₄⁺ and NH₄B(C₆H₅)₄ = 1:1

Similarly, mole ratio of NH₄⁺ and NH₄Cl = 1:1

Therefore, moles of NH₄Cl in 500 ml sample = 0.003328 moles

Mass of NH₄Cl = 0.003328 mol * 53.492 g/mol = 0.178 g

Mass percentage of NH₄Cl = (0.178/5.025) * 100% = 3.54%

Number of moles of KB(C₆H₅)₄ in 0.105 g (precipitated from 200.0 ml aliquot) = 0.105 g/ 358.33 g/mol = 0.000293 moles

In 500 ml solution, number of moles present = 0.000293 * 500/200 = 0.0007326 moles.

From equation of the reaction; mole ratio of K⁺ and KB(C₆H₅)₄ = 1:1

Similarly, mole ratio of K⁺ and K₂CO₃ = 2:1

Therefore, moles of K₂CO₃ in 500 ml sample = 0.0007326/2 moles = 0.0003663 moles

Mass of K₂CO₃ = 0.0003663 mol * 138.21 g/mol = 0.05063 g

Mass percentage of K₂CO₃ = (0.05063/5.025) * 100% = 1.01%

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