Chemistry High School

PLEASE HELP!! :((((((((((((((((((((((((

Answers

Answer 1

Where is the word problems? Like the problems that you have to put it in.

Explanation:

Related Questions

how much is 3.5 gallons in cups

Answers

Answer:

3.6 gallons are equal to 56 cups

if two group in the game are exirting equal ad opposite force the rope,will the rope move?

Answers

Answer:

No.

Explanation:

If the forces are acting on opposite direction, they will cancel out each other. As a result, the object will not move. This type of force is called balanced force. In this type of force the net force acting on an object is equal to 0. Hence, if two groups in the game are exerting equal and opposite force, the rope will not move.

Calculate the following expression and round your answer to the correct number of significant figures.
52.6cm x 1.214cm

Answers

Answer:

63.9 cm

Explanation:

Please help I don't understand this-

Answers

Answer:

im sorry i think i know the answer but i dont want you to get it wrong

Explanation:

Answer:its C

Explanation:

bc were learning bout rn n we lagit just went over this

If 5,800 j of energy are applied to a 15.2 kg piece of lead, by how much does the temp change if the specific heat of lead is 0.128

Answers

Answer:

The answer will be 2.98K

Explanation:

Using the formula:

Q = mc∆T

Q= 5,800 (heat in joules)

m= convert 15.2kg to g which is 15200g (mass in grams)

c= 0.128 J/g °c (Specific heat capacity)

∆T= what we need to find (temperature change)

5800J = 15200g x 0.128 x ∆T

= 2.98K

what is one way that the thermal energy of a system may be changed?

Answers

Answer:

In a open system, the thermal energy of a system may be changed by adding or removing matter with a different temperature.

Explanation:

The thermal energy of a system can be changed when a new substance of different temperature is introduced into the system

The thermal energy of a system is the amount of heat energy contained in that system.

The quantity of heat in a system is given as;

[tex]Q = mc \Delta \theta[/tex]

where;

[tex]\Delta \theta[/tex] is the change in the temperature of the system

When a new substance is introduced into the system, the temperature of the resulting system changes.

For example;

a hot iron introduced into a cold water, will increase the temperature of the water thereby increasing the thermal energy of the water.

Thus, the thermal energy of a system can be changed when a new substance of different temperature is introduced into the system.

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Which of the following is an example of the Law of Conservation of Mass?

Answers

Answer:

Explanation:

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.

Answer:

C, since matter cannot be created or destroyed the same number of particles must be present on both sides of the equation. Hence why all chemical reactions must be balanced.

Explanation:

Which statement best explains why aluminum is a pure substance? Group of answer choices Aluminum is one type of atom and its composition is always the same. Aluminum has a composition that is evenly mixed. The aluminum atom cannot be seen with a microscope. Aluminum contains substances that are not bonded together.

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Answer:

The best explanation for both the first and second claims is that aluminum is a pure substance: Aluminum is one form of atom and its structure is always the same. Aluminum has an evenly blended composition.

Explanation:

Aluminum is one type of atom and its composition is always the same, this statement also gives the property of a pure substance . In fact, pure substances are often homogeneous and contain only one form of atom or molecule.

One of a pure substance's key characteristics is that it has a uniform composition that is homologous in nature, and can be mixed uniformly throughout. ALUMINUM's second statement notes the property of a pure substance. Aluminum is also homologous in terms of occurrence.

The atoms are very small and have a diameter of around 1 x 10-10 meters. It's difficult to view them using a light microscope due to their limited size. Although it may not be possible to view an atom using a light microscope, a number of techniques have been developed, such as electron microscopy, to observe and research the structure of atoms. Therefore, the statement that the aluminum atom can not be seen through a microscope does not explain the pure content of aluminum.

This argument - 'Aluminum contains substances which are not bound together' does not explain the fact that it is a pure material as it notes that the property of a pure material does not exist in relation to its chemical bonds.

.Therefore, the first and second aluminum statements give the best description of a pure material.

What is the density of a sample of lead that has a mass of 4.85 kg and a density of 280 cm ^3?

Answers

Answer:

The answer is 0.017 kg/cm³

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 4.85 kg

volume = 280 cm³

We have

[tex]density = \frac{4.85}{280} \\ = 0.01732...[/tex]

We have the final answer as

0.017 kg/cm³

Hope this helps you

Help fast. If 1500 joules of energy is used to heat 50g of water with a temperature of 20°C, then what will the final temperature be? (Water’s specific heat is 4.18 j/g°c)

Answers

50*f

Hope this helps

Answer:

27°C

Explanation:

q = 1500 J

m = 50g

c = 4.18 J/g°C

q = m·c·ΔT

ΔT = [tex]\frac{1500J}{50g*4.18\frac{J}{gC} } = 7C[/tex]

ΔT = final temperature - initial temperature

Final temp = 20 + 7 = 27°C

What is the correct formula for calcium dihydrogen phosphate?

A) CaH2PO4
B) Ca(H2PO4)2
C) Ca(H2HPO4)2
D) Ca2H2PO4

Answers

Answer:

B) Ca(H2PO4)2

Explanation:

To solve this we must be knowing each and every concept related to chemical formula. Therefore, the correct option is option B among all the given options.

What is chemical formula?

The chemical formula is indeed a means of expressing information about just the chemical proportion of atoms that comprise a certain chemical compound as well as molecule through the use of chemical element numbers and symbols.

Furthermore, the molecular formula does not contain any words and does not serve as a chemical name. However, it just indicates basic chemical structures and is not the same as the entire chemical structural formula. The correct formula for calcium dihydrogen phosphate is Ca(H[tex]_2[/tex]PO[tex]_4[/tex])[tex]_2[/tex].

Therefore, the correct option is option B among all the given options.

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what is kwaishokor?

Answers

Answer:

Kwaishokor is a form of severe protein malnutrition characterized by edema and an enlarged liver with fattty infiltrates.

Explanation:

Why do you think many metals are good at conducting electricity?
Hurry, please!!!

Answers

Answer. Metals are excellent conductors because the atoms in a metal form a matrix through which their outer electrons can move freely. Instead of orbiting their respective metal atoms, they form a "sea" of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions

0.20dm
2. How many grams of salt, NaCl need to be dissolved in 0.50dm of solution to
make a 0.20moldm solution?

Answers

Answer:

I don't no sorry. ਕਿਉੁਂਕਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ 478figxigxurRyyv ਸ੍

Water, air, buildings, food, and everything visible and invisible have mass and takes up space. What is the word used to describe anything that has mass and takes up space?

Answers

Answer:

Matter

hope this helps

Answer:

matter

Explanation:

Did the test

Which of the following represents a pair of isotopes?
A. Ca+2, Be+2
B. 12C, 14C
C. Fe+2, Fe+3
D. 7N, 8O

Answers

B.
Isotopes is an atom has same number of electrons and protons but different number of neutron.

We have that

the Carbon isotopes represents a pair of isotopes

12C, 14C

Option B

From the question we are told

Which of the following represents a pair of isotopes?

A. Ca+2, Be+2 B. 12C, 14C C. Fe+2, Fe+3 D. 7N, 8O

Generally

Isotopes

This is defined as variant forms of an element with variant atomic mass but same proton number

Therefore

the Carbon isotopes represents a pair of isotopes

12C, 14C

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Explain what is meant by the natural abundance of isotopes. Can someone help me to answer this plz

Answers

“Is a percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element.” < you can try and put it in your own words or you could stick with that just add quotations :)

Looking at the periodic table, which of theses elements has the smallest atomic radius (A. Sodium B. potasaium C. Hydrogen D. LithIum)

Answers

Answer:

The answer is C. Hydrogen

Explanation:

It has a radius of 53 pm calculated.

what are class C fire extinguishers used for

Answers

they are used on fires that involve electricity such as electrical fires which can be very dangerous

I just need a sentence

Answers

Answer:

Plankton will never get the kraby patty secret formula

Explanation:

A molecular formula is a representation of a molecule that uses chemical symbols to indicate the types of atoms followed by subscripts to show the number of atoms of each type in the molecule. (A subscript is used only when more than one atom of a given type is present.)

4. How does the water vapor change as altitude increases?

Answers

Answer:

it drifts through the atmosphere and the vapor absorbs heat then the warm air rises up therefore leaving the planet's surface and releasing the heat back into the upper part of the atmosphere

why do astronomers use frequencies other than the visible ones when they are investigating the universe?

Answers

Because different objects give out electromagnetic radiation at different frequencies. Some objects are very ea...

Hope this help

Which pair of elements have the same number of atomic orbitals?
A.
Silver and strontium
B.
Sodium and strontium
C.
Silver and sulfur
D.
Sulfur and strontium

Answers

Answer:

B I think

Explanation:

Answer:

B, I'm guessing by their characteristics

Who wants to do my acellus work? Or know how to get the answers ?

Answers

im just answering questions to get points Explanation:

i dont know what points do

Answer:

Hello I passed my Chemistry exam (Acellus) in the beginning of June:)

Explanation:

a drop of water has a volume of about 0.05 mL. How many molecules of water are in a drop of water?

Answers

Answer:

20 drops

Explanation:

how many significant figures in 890

Answers

Answer:

890 has 2 significant figures

Explanation:

how many unpaired electrons does calcium have

Answers

Answer:

Explanation:

The number of unpaired electrons in is 0

Answer:

4 unpaired electrons

Explanation:

becausd it have 4 unpaired electros it is paramagnetic

Which one of the following is an alkane?

A. C2H4
B. C5H10
C. C3H8
D. C4H6

Answers

Hello

Answer :

C. C3H8

i will give brainliest and lots of points

Answers

Answer:yyyyyyyyyeeeeeeetttttt you will figure it out

Explanation:

What is the relationship between the temperature and the rate of the reaction?

negative
neutral
positive

Answers

i think it would be neutral

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