Answer:
its definitely a physical change as the way you see it now is different then before
Answer:
b
Explanation:
because it changed colors
Why does forming bonds release energy? *
how can a substance stay at a certain temperature even though it is being heated?
Can you please help me with this question
Answer:
First blank: spiral arms
Second blank: center
Explanation:
Help please I need it!
Assume that a 100-base pair DNA double helix contains 45 cytosine bases. Use logical thinking to figure out how many adenine bases there will be. Explain how you know.
Answer:
You will not be allowed to have any learning aids while taking a test or ... A DNA molecule consists of three parts—a nitrogen base, ... There are four DNA nucleotides, each with one of the four nitrogen bases (adenine, thymine, cytosine, and guanine). The DNA forms a two-stranded spiral, or double helix.
Explanation:
hope this helps ✌️
Explain how to identify a starting position on a line.
Displacement is defined as the distance, in any direction, of an object relative to the position of another object. Physicists use the concept of a position vector as a graphical tool to visualize displacements. A position vector expresses the positionof an object from the origin of a coordinate system
Answer:
Pick a reference point on the line to be the zero position. Determine the direction and measure the distance from zero in standard units.
Explanation:
5. __HCl + __NaOH-> __NaCl + __H2O
6. __FeS + __HCl-> __H2S + __FeCl2
7. __C2H4 + __O2-> __CO2 + __H2O
INEEDHELP
Answer:
umm is this free points? cause this looks very ummm weird
Explanation:
how does activation energy influence a reaction
Answer: The activation energy of a particular reaction determines the rate at which it will proceed. The higher the activation energy, the slower the chemical reaction will be. The example of iron rusting illustrates an inherently slow reaction.
Explanation:
35 points
What are the reactants and the products in this equation?
2H2 + O2 → 2H2O
a Reactants: water; Products: hydrogen, oxygen
b Reactants: hydrogen, oxygen; Products: water
Answer:
02 ;D h2oooooooooooo
long story shortB
Explanation:
Answer:
B
Explanation:
2H2→Hydrogen peroxide
O2→oxygen
"A water molecule (formally known as dihydrogen monoxide) is composed of two hydrogen atoms and one oxygen atom. ... The actual reaction to make water is a bit more complicated: 2H2 + O2 = 2H2O + Energy"
"A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction."
The answer is B, hope this helps :)
27.2Pb(NO3)2 --> 2Pb0 + 4NO2 + O2
O A. Synthesis
B. Single displacement
C. Decomposition
D. Combustion
find the percent composition of lead in lead (II) nitrate. round to 2 significant figures.
Answer/Explanation:
62.559%
mass of an element X 100%
mass of the compound
Scientific Notation: 3.45 x 10^5
E Notation: 3.45e5
Explain why Chlorine has the largest electronegativity between Ne, Mg, Ba, Sb, Hg, Li?
Answer:
Look at the image provided and try work it out. I don't have the time but I hope I helped you!
Explanation:
To Identify a mineral, there are tests that are used including:
Geologists use the following tests to distinguish minerals and the rocks they make: hardness, color, streak, luster, cleavage and chemical reaction.
PLEASE HELP ASAP!!!
A teacher wrote the following part of a chemical equation involving water (H2O) and carbon dioxide (CO2): H2O + CO2 ---> ?
What is the most likely result of the chemical reaction represented by this equation?
A. H2CO3
B. NaCl
C. HNO3
D. H2Ca3
Answer:
Id say A. I think I hope I'm right
What three types of particles make up an atom? What are their charges?
Answer:
Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.
Answer:
Protons, positive charge
Neutrons, neutral
Electrons, negative charge
Explanation:
Please help... giving a lot of points and awarding brainliest.
what is cell explain in a paragraph
Answer:
Cells are the basic building blocks of living things. The human body is composed of trillions of cells, all with their own specialised function. Cells are the basic structures of all living organisms. Cells provide structure for the body, take in nutrients from food and carry out important functions.
Josie draws models of the particles within a substance. Which model best represents the particles in
a solid?
D
A
B
C
how many grams of sodium carbonate must react with 222 g of calcium chloride to make 233 grams of sodium chloride and 201 grams of calcium carbonate?
Answer: 212 g of sodium carbonate must react
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
The balanced chemical equation is:
[tex]Na_2CO_3+CaCl_2\rightarrow 2NaCl+CaCO_3[/tex]
Mass of products = mass of sodium chloride + mass of calcium carbonate = 233 g+ 201 g= 434 g
Mass of reactants= mass of sodium carbonate + mass of calcium chloride =x + 222 g
As the mass of reactants should be equal to mass of products
434 = x + 222 g
x = 212 g
Thus 212 g of sodium carbonate must react with 222 g of calcium chloride to make 233 grams of sodium chloride and 201 grams of calcium carbonate
pls help science
Which description properly describes the plant structures involved in photosynthesis?
Stomata take in water, sunlight, and carbon dioxide and release oxygen.
Phloem transports water, stomata take in carbon dioxide, and chlorophyll absorbs sunlight.
Xylem takes in water, sunlight, and carbon dioxide and releases oxygen.
Stomata take in carbon dioxide and release oxygen.
Answer:
Stomata take in water, sunlight, and carbon dioxide and release oxygen.
Explanation:
Photosynthesis collects and absorbs sunlight and converts the sunlight into sugars (glycose), then the plant stores the sugar and uses it.
Is Mg(CH3COO)2 soluble or insoluble
Answer:
It is Soluble
Explanation:
Name- Magnesium acetate
It dissolves easily in water and alcohol.
how can acids cause chemical weathering
The acids react with the chemical composition of the rock causes the disintegration of the rocks.
Chemicals when react with the chemical components of the rocks cause the disintegration of the chemical and physical structure of rocks which cause breakage of rocks into parts. This process is called chemical weathering.
For example, the sulfur dioxide gas in the air reacts with the water in the air to form the acid rain.
The acid rain reacts with the chalk or limestone rock that causes the disintegration of the chemical structure and physical structure of rock causing breakage of the chalk or limestone.
Learn more about weathering:
https://brainly.com/question/14426457
If it takes 5 hours to produce 8.0 kg of alcohol, how any days will it take to consume 1000 kg of glucose?
It takes 21.3 days
Further explanationGiven
5 hr = 8 kg Alcohol
Required
Days to consume 1000 kg of glucose
Solution
Alcoholic fermentation⇒ glucose produces ethanol and carbon dioxide,
C₆H₁₂O₆ → 2 C₂H₅OH + 2CO₂
mol ethanol :
[tex]\tt \dfrac{5000~g}{46~g/mol}=108.7~moles[/tex]
moles of glucose to produce 108.7 moles ethanol :
[tex]\tt \dfrac{1}{2}\times 108.7=54.35[/tex]
54.35 moles = 5 hours
moles of 1000 kg of glucose :
[tex]\tt \dfrac{10^6~g}{180~g/mol}=5555.5~moles[/tex]
So for 5555.5 moles, it takes :
[tex]\tt \dfrac{5555.5}{54.35}\times 5~hours=511.085~h=21.3~days[/tex]
What type of
energy travels in the form of electromagnetic waves?
A: Chemical Energy
B: Gravitational Energy
C: Nuclear Energy
D: Radiant Energy
Answer:
Radiant Energy
Explanation:
Radiant energy is created through electromagnetic waves
State the law of multiple proportions.
Answer:
Law of Multiple proportion states that when two elements combine to form more than one compound, the mass of one element, which combines with a fixed mass of the other element, will always be ratios of whole numbers. For example, let us assume 2 molecules CO (carbon monoxide) and CO2(carbon dioxide).
Explanation:
The best description of the Big Bang Theory is ______________
A. The universe began with cold dense energy compressing into matter after which all matter and energy began rapidly contracting toward each other.
B. The universe began with hot dense energy compressing into matter after which all matter and energy began rapidly expanding away from each other.
C. The universe began with hot dense matter after which all energy began rapidly expanding away from each other.
D. The universe began with cold, spread out matter compressing into energy, after which all matter and energy began slowly moving toward each other
Answer:
B. the universe began with hot dense energy compressing into matter after which all matter and energy began to rapidly expanding away from each other.
hope it helps
What is meant by the dual wave-particle nature of light?
Dual wave particle nature of light can be regarded as mechanism that says light and matter will also has the properties of waves as well as that of particles.
This concept is found in mechanics as it describes how light and matter also has the properties associated with waves as well as particles.The duality explained inadequacy of conventional concepts of both wave and particle so as to give explanation about behaviour of quantum objects.the dual nature of light made us to understand that light has wave properties and it also has particle properties.Some of the properties of wave that light has are:
wavelengthspeedTherefore, duality means have both characteristics of light and wave
Learn more at,: https://brainly.com/question/14326678?referrer=searchResults
What force pulled the solar system together out of a cloud of gas and dust
How did chemists change Mendeleev's periodic table in the early 1900s?
Answer:
They used atomic number instead of atomic mass to organize the elements. From an element's location in the periodic table, you can predict: ... The elements have similar properties.
Atoms combine in whole-numbcher ratios.