Answer:
C. Soil
Explanation:
The choice with variable composition is the soil. Soil have many different composition.
Soil is made up of minerals, organic matter , water and soil air.Soil minerals are derived from weathered bedrock materials that have been broken down into small pieces. Organic matter is derived from dead and decaying materials from plants and animals. All these materials combine together to form a soil.An example of a physical property of an element is the elements ability to
Answer:
form an aqueous solution
Explanation:
The same substance is present before and after the change. Making the aqueous solution is physical change.
(100 points) {brainliest}
Solar energy is light and heat from the sun that's harvested to produce electricity or otherwise provide energy. Which of the following statements best describes solar energy?
A. Solar energy is non-renewable because clouds sometimes block the sun.
B. Solar energy is non-renewable because the sun sets each night.
C. Solar energy is renewable because it will be available as long as the sun continues to burn.
D. Solar energy is renewable because it has a small carbon footprint.
Answer:
C
Explanation:
When a mixture contains substances that are not evenly mixed, what is it called?
Answer:
Heterogeneous mixture
Explanation:
A mixture that contains substances that are not evenly mixed is called a heterogeneous mixture.
A heterogenous mixture is one in which their constituents exists in different phases. Examples are solutions, suspensions and colloids.
When the mixtures are evenly mixed, they are said to be homogenous mixtures. Their components are in the same phase.
A student measures a volume as 25 ml, wheras the correct volume is 23 mL. What is the percent error?
Answer:
the other number is different
Explanation:
How many water molecules are generated when 3.60 moles of ammonia react according to the following equation:
3PbO+2NH3→3Pb+N2+3H2O
Use 6.022×1023mol−1 for Avogadro's number.
Your answer should have three significant figures.
Answer:
3.25 × 10²⁴ molecules of water
Explanation:
Step 1: Write the balanced equation
3 PbO + 2 NH₃ → 3 Pb + N₂ + 3 H₂O
Step 2: Calculate the moles of water formed from 3.60 moles of ammonia
The molar ratio of NH₃ to H₂O is 2:3. The moles of water formed are 3/2 × 3.60 mol = 5.40 mol
Step 3: Calculate the molecules in 5.40 moles of water
We will use Avogadro's number: 6.022 × 10²³ molecules/mol.
5.40 mol × 6.022 × 10²³ molecules/mol = 3.25 × 10²⁴ molecules
Silver chloride, often used in silver plating, contains 75.27% Ag.
Calculate the mass of silver chloride in grams required to make 5.2 g of silver plating.
Answer:
add
Explanation:
add 100 and 200 and that is your answer
Imagine you are sitting on a surfboard in the ocean, waiting to catch a big wave. When the ocean is still, you are sitting at a point that would be a midpoint (the undisturbed position) of any waves that come your way. You look out to see and see a set of waves coming your way. What you see is actually a pattern of troughs followed be crest of the waves moving forward you and the shore. The distance between the crest is 5 meters. A crest passes you every 20 seconds.
Answer these questions:
A. What is the wavelength?
B. What is the frequency?
C. What is the wave velocity?
Plzzz help with is for a Science assignment so plz put a good answer the person who answers this good gets brainly!
Answer:
a. What is the wavelength?
The wavelength is 5 meters.
b. What is the frequency?
The frequency is 0.05Hz
c. What is the wave velocity?
The wave velocity is 0.25 meters per second
Explanation:
the wavelength is the distance between two troughs or two crests, which in this case is 5 meters.
the frequency=cycles/time. For this equation the equation would be 1/20, which is 0.05
the wave velocity=wavelength x frequency. Plug in the numbers, 5 x 0.05, and you will get 0.25.
Ice is actually frozen ______
Answer:
water
Explanation:
or h2o i mean theyre the same thing soo..
Match the term with its description.
Acid
Base
Ions
pH
A) A compound that increases hydrogen ions (H+) when it is dissolved in a solution
B) A value from 0 to 14 that is used to specify how acidic or basic a compound is when it is dissolved in water
C) A compound that increases the hydroxide ions (OH−) when it is dissolved in a solution
D) An atom or molecule that has a positive or negative charge
Answer:
1 a 2c 3d 4b
Explanation:
I think that's right
if solid become liquid can it become solid again
Answer:
Yes! It's because of like freezing and or solidification. It's the phase transition in which a liquid turns into a solid. It's when the temperature is lowered to or below a type of freezing point.
Explanation:
1)
Radioactive materials have unstable
A)
nuclei
B)
electrons.
Delectron clouds.
D)
area of atom outside of nucleus.
Determine the mass of CO2 gas produced when 8.24 g of NaHCO3 is added to a solution that contains 4.41 g of HCl.
The mass of CO₂ gas = 4.312 g
Further explanationReaction
NaHCO₃ (s) + HCl (aq) → NaCl (aq) + H₂O (aq) + CO₂ (g)
Find limiting reactant
mol NaHCO₃
[tex]\tt \dfrac{8.24}{84,007 }=0.098[/tex]
mol HCl
[tex]\tt \dfrac{4.41}{36.5}=0.121[/tex]
Limiting reactant : NaHCO₃ (smaller)
mol CO₂ = mol NaHCO₃ = 0.098
mass CO₂ :
[tex]\tt 0.098\times 44=4.312~g[/tex]
Which of the fields below are significantly involved in food
engineering?
A. Civil engineering, structural engineering, genetic engineering
B. Construction technology, civil engineering, structural
engineering
C. Biology, industrial engineering civil engineering
D. Genetic engineering, chemical engineering, biology
Answer:
D.
Explanation:
Genetic Engineering is a huge part in manipulating a foods property. Chemical engineering mostly the science with numbers in foods.
Biology is literally the life of the food.
Genetic engineering, chemical engineering, biology fields are significantly involved in food engineering.
Hence, Option (D) is correct answer.
What is Food Engineering ?Food engineering is the application of engineering principles which develop and design the systems for the production, storing, distributing and processing the food material.
Which fields are significantly involved in food engineering ?Food engineering is engineering field that combines microbiology, genetic engineering, chemistry engineering, biology and some other branches of science to produce food materials.
Thus from the above conclusion we can say that Genetic engineering, chemical engineering, biology fields are significantly involved in food engineering.
Hence, Option (D) is correct answer.
Learn more about the Food Engineering here: https://brainly.com/question/2868223
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Explain how heat moves from one end of a metal rod to the other. (use terms small particles/ atoms, collide, transfer of energy, high/low temperature region to elaborate) /2 ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Do you think the drawing pins may fall? Give a scientific reason to support your answer. /2
________________________________________________________________________________________________________________________________________________________
Answer:
I only know number one answer hope it is helpful
Conduction is the transfer of heat through stationary matter by physical contact. (The matter is stationary on a macroscopic scale—we know there is thermal motion of the atoms and molecules at any temperature above absolute zero.) Heat transferred from an electric stove to the bottom of a pot is an example of conduction.
Some materials conduct thermal energy faster than others. For example, the pillow in your room may the same temperature as the metal doorknob, but the doorknob feels cooler to the touch. In general, good conductors of electricity (metals like copper, aluminum, gold, and silver) are also good heat conductors, whereas insulators of electricity (wood, plastic, and rubber) are poor heat conductors.
Heat transfers in solid by conduction mechanism where the hot molecule at one end transfers the heat energy to the next and so on through the closely packed chain of molecules.
What is conduction ?Heat transfers from one region to the other over a temperature gradient. Heat transfers through different mods in different states of matter. In solids heat is distributed through conduction. In liquids and gases heat transfers through convection.
In solids particles are closely packed by strong intermolecular forces and they have no space in between to move apart. Hence, it is very easy to distribute heat over a solid substance.
The heat from the burner make one end of the metallic rod hotter, where the particles at this end transfers this heat to the next and so on in the closely packed chain. As the rod gets hot, the pin will fall from the chain because, the thermal motion inside these solids make them apart.
Find more on conduction :
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24g copper is submerged in water in a graduated cylinder, the total volume increases bu 2.7ml what is the density of copper
Answer:
8.89 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{24}{2.7} \\ = 8.88888...[/tex]
We have the final answer as
8.89 g/mLHope this helps you
CuO+H₂ → Cu +H₂O redox equation
Answer:
Cu H₂O
Explanation:
CuO + H₂ -----> Cu + H₂O
Oxidation : Gaining of oxygen OR Losing of hydrogen
Reduction : Gaining of Hydrogen OR Losing of Oxygen
Here ,
CuO gets reduced [ it loses oxygen ] and become Cu
H₂ gets oxidized [ it gains oxygen ] and becomes H₂O
Substance that gets oxidised = H₂
Substance that gets reduced = CuO
Also ,
Oxidising agent = substance that gets reduced = CuO
Reducing agent = substance that gets oxidized = H₂
Answer:
Cu⁺² + 2e⁻ → Cu
Explanation:
A redox reaction is the half-equation where the element is reduced (gains electrons).
Compounds always have to have oxidation numbers that add to 0.
Oxygen's oxidation number is -2.
Stand alone elements always have an oxidation number of 0.
Reactants
Because Copper's oxidation number + Oxygen's oxidation number = 0, and Oxygen's oxidation number = -2, we know Copper's oxidation number is +2.
H₂ has to have a net oxidation of 0, so Hydrogen's oxidation number is 0.
Products
Copper's oxidation number is 0 because it's a standalone element.
2 * Hydrogen's oxidation number + Oxygen's oxidation number = 0, so that means Oxygen's oxidation number is -2, and Hydrogen's is +1.
Because Copper's oxidation number went down from +2 to 0, that means it gained electrons and therefore was reduced. So your answer is:
Cu⁺² + 2e⁻ → Cu
Explain the red shift and Doppler effect
True or false: An element has two layers of electrons. The electrons in the outermost layer are called distance electrons.
and how many layers
Answer:
true
Explanation:
HURRY PLEASE HELP
Carbon-14 has a half-life of 5,770 years. A 25 gram sample of Carbon-14 was found. The original sample mass was hypothesized to have a mass of 100 grams.
How old was the sample based on this hypothesis?
A. 2885
B. 11,540
C. 17,310
D. 23,080
What type of light do plants use to make food?
a.
visible
b.
X ray
c.
microwave
Answer:
Ray
Explanation:
Rays of the sun is used by plants to make their own food
What is the molar concentration of an aqueous solution that has 200g of Iron (II) Chloride dissolved in 450mL of water?
(convert to moles then solve for Molarity)
We are given:
200 grams of FeCl₂ in 450 mL of water
Number of Moles of FeCl₂ in 450 mL:
Molar mass of FeCl₂ = 127 grams/mol (approx)
Number of moles = Given mass / molar mass
replacing the variables
Number of moles = 200 / 127
Number of moles = 1.57 moles
Number of Moles of FeCl₂ in 1 L (Molarity):
We know that in 450 mL of the solution, we have 1.57 moles
Molarity of the solution = Number of moles / Volume of solution (in L)
Molarity of the solution = 1.57 / 0.45
Molarity of the solution = 3.489 M
Which of the following chemical formulas represents a common acid?
*
NaOH
KI
HCI
H20
Why is the strength of a hydrogen bond greater than that of a dipole interaction force when hydrogen bonds with other molecules?
A. When bonded, hydrogen's small size and positively charged exposed nucleus lead to strong attraction between hydrogen and electronegative molecules.
B. Hydrogen is larger than the electronegative atoms it bonds with.
C. Hydrogen has three electron shells that protect its nucleus.
D. When hydrogen combines with other atoms, its electrons are strongly drawn toward the nucleus.
Answer:
Tbh I don't know the answer
Explanation:
But here is some research that may help you...Greater electronegativity of the hydrogen bond acceptor will lead to an increase in hydrogen-bond strength. The hydrogen bond is one of the strongest intermolecular attractions, but weaker than a covalent or an ionic bond. Hydrogen bonds are responsible for holding together DNA, proteins, and other macromolecules.
Answer:
Its A
Explanation:
The small size of the hydrogen end combined with a large difference in charges between the poles creates a force of attraction that is greater than that of dipole interaction.
Name the following compounds
Answer:
What are the compounds
Explanation:
Answer:
Where is the picture?
Explanation:
Compute the product of P.V.
The Awnser is 51.3
An isotope of an unknown element has 12
protons and 25 neutrons. Identify the
isotope.
Answer:
Magnesium
Explanation:
The answer is Magnesium
which of earth's spheres is most affected by weathering and erosion
Answer: the hydrosphere
Explanation:
What will probably happen to a very dry forest
Answer:
Because of how dry the forest is there might be a fire a really big fire Explanation:
which of the following best defines an acid
The Water near the poles is ______ than the water near the equator.
A. More dense
B.less dense
C.equally as dense
40 points!
Answer:A
Explanation:
