Answer:
it undergoes a chemical change
1 question hurry as fast as possible no link
Answer: ELEMENT
Explanation:
Which of these properties is mainly responsible for the difference in
melting rate between salt water and fresh water?
O acidity
O temperature
G
O density
O mass
Answer:
Density is mainly responsible for the difference in melting rate between salt water and fresh water.
Explanation:
Hoped this helped.
Science 5th grade very PLZ answer correctly TYSM WILL MARK AS BRAINLIST IF ANSWERED TODAY!
Answer:
A
Explanation:
Conducts electricity:
-Steel
-Gold
-Copper
-Aluminum
Does not conduct electricity:
-Plastic
-Glass
-Rubber
-Wood
Metallic bonding causes metals to conduct electricity. Some metals are more highly conductive than others.
Hope this helps :)
Answer:
The first table correctly classifies the materials.
Explanation:
In table 1, all the elements on the left side are transition metals, expect for steel. Steel is not an element, it's an alloy (Which is a combination of two or more elements).Transition metals are very good conductors of heat and electricity. The reason why transition metals make such good conductors is because their outer electrons can move freely in their atom.
The right side of table 1 correctly classifies the materials that do not conduct electricity. The reason why those materials are poor conductors is because they all have their electrons tightly bound to their atoms.
In table 2, it classifies copper has a poor conductor which is wrong. It also classifies wood as a good conductor which also wrong for the reasons I stated above.
Consider an ice cube and a hot radiator. Which has the higher thermal energy?
the ice cube
the radiator
The thermal energy of a material increases with temperature. Therefore, the radiator has the higher thermal energy.
What is thermal energy?When the temperature rises, a type of energy called thermal energy is produced. The amount of thermal energy usually directly inversely proportional to the object's change in temperature. Thermal energy takes the form of heat.
The thermal energy of a material increases with temperature. The quicker motions of the substance's atoms and molecules are what cause thermal energy to grow as temperature rises.
In some cases, a substance's molecules will separate from one another and leave because the temperature is just so high. Unexpectedly, thermal energy also affects the states of matter. The radiator has the higher thermal energy.
Therefore, the radiator has the higher thermal energy.
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A sample of hydrogen sulfide, H2S, has a mass of 13.7513.75 g. Calculate the number of hydrogen sulfide molecules in the sample
Answer: 2.43 x 10^23 molecules
Explanation:
Molar mass of H2S: 2(1.008) + 32.06 = 34.1 g/mole
Avogadro’s number for converting moles to atoms or molecules: 6.02 x 10^23
(13.751375g H2S)(1 mole H2S)(6.02x10^23 molecules) / (34.1g/mole H2S)(1mole H2S) = 2.43 x 10^23 molecules H2S
help me someone! giving brainliest
Answer:
last or second
Explanation:
report me if not correct
Answer:
Should be the second one
Explanation:
In comments
Thanks for the Brainliest
Read the following statement:
The amount of force acting on an object is equal to its mass times its acceleration.
Does the statement describe a scientific law?
No, because it is applicable to all cases in the natural world
Yes, because it is applicable to just a few cases in the natural world
No, because it describes the relationship between force and acceleration
Yes, because it describes how mass and acceleration affect force
Answer:
D
Explanation:
the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of an object
What’s the answer to this
Answer: 5
Explanation:
please brainliest me
I believe it is 3
Answer:
Explanation:
1.25 is the closest to 1.04 or not I want to answer please. I think it's true, but I want to prove it scientifically, please.
Answer:
false because if you round both of them
Temperature is a measure of ___________
A: Heat Energy
B: Potential Energy
C: Climate
D: Kinetic Energy
Answer:
D: Kinetic Energy
Explanation:
Temperature is a measure of kinetic energy. Temperature is a measure of the average kinetic energy of the particles in an object. When temperature increases, the motion of these particles also increases.
Hope this helps :)
How do models help scientists study atomic composition?
Models can be used to represent a process or show the composition of a material. For example, a model of an atom shows what matter is made out of and how it is composed. Scientists have been using models since ancient times to help explain the world around us. Models help you understand something that you cannot see or touch by making it visible or giving it a form that you can physically explore. In this case, the model lets scientists explore atoms without having to use an electron microscope. This method provides them with up-close images from different angles so they can learn about their properties in detail.
5. Which element would form
covalent bond with Oxygen (0)
Sodium (Na)
Calcium (Ca)
Aluminum (AI)
Selenium (Se)
Help please witb this
Answer:
9
Explanation:
In a chemical equation, the subscript numbers next to each element's symbol tell us how many atoms of that element are in the substance. So, for example, in H₂O, there are 2 atoms of hydrogen since there is a "₂" next to the H.
What's next to our H in C₄H₉? It looks like "₉," so we can determine that there are 9 hydrogen atoms in C₄H₉ (which is butyl, by the way).
Hopefully that's helpful! :)
Determine the concentration of a diluted solution of sodium chloride that was prepared by diluting 20.0 mL of a 4.5 M solution of sodium chloride to 500.0 mL.
Answer:
ok
Explanation:
How do atomic and molecular interactions explain the properties of matter that we see and feel
The atomic and molecular interactions unveil the bulk properties of matter in our environment by ways of the fact that everything in the whole universe is made of either atoms, molecules or even ions
How matter is made up of atoms and molecules?It has been proven practically everything in the whole universe is matter and everything which interact with matter is also matter. This explains to us the reasons why matter could be atoms, molecules or ions.
That being said, some substances (matter) is made up of atoms of elements, some made up of molecules or atoms and molecules and others ions or both. However, matter is anything which has mass and occupies space.
In conclusion, we can now conclude from the explanation above that the properties of matter are as a result of the interaction which exists between matter at the atomic and molecular level.
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a solution of HCI contains 36 percent HCI,by mass and calculate the mole fraction of HCI in the solution?
Explanation:
You have a solution that contains 36 g HCl dissolved in 64 g water
Molar mass HCl = 36.45 g/mol
Mol HCl in 36 g = 36 g / 36.45 g/mol = 0.9876 mol
Molar mass H2O = 18 g/mol
Mol H2O in 64 g = 64 g / 18 g/mol = 3.5556 mol
Total mol = 0.9875 + 3.5556 = 4.5431 mol
Mol fraction HCl = 0.9876 mol / 4.5431 mol = 0.2174
Mol fraction H2O = 3.5556 / 4.5431 = 0.7826
The answer should have 2 significant digits:
Mol fraction HCl = 0.22
Mol fraction H2O = 0.78
Mol fraction has no units.
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Stems are important plant structures because they _________.
A.
are the main sites of photosynthesis for plants
B.
are the only site of water and nutrient transport
C.
allow plants to absorb water and nutrients from the soil
D.
give the plant structure and support
Answer:
D
Explanation:
supports the plant,leaves and flowers
Al^+3
protons =
electrons =
neutrons =
N^-3
protons =
electrons =
neutrons =
Explanation:
aluminium
proton= 13
electron=13
neutron=27
nitrogen
proton= 7
electron=7
neutron= 14
how many grams of H20 can be formed from 0.996 g C8 H18?
Which of the following correctly describes the law of conservation of matter?
O Matter makes up 98% of stuff in the universe, so it has to be created and destroyed sometimes
O Matter can be destroyed during a chemical reaction as long as it is created again in a different reaction
O Matter can only be created, but not destroyed in chemical equations
O Matter can neither be created nor destroyed during a chemical reaction
Assertion is correct statement but reason is wrong statement.
Assertion is correct statement but reason is wrong statement.Matter can neither be created nor destroyed is a statement of the law of conservation of mass.
Matter can neither be created nor destroyed is a statement of the law of conservation of mass.The assertion is correct but the reason is incorrect.
How many grams are in 0.39 moles of water
Answer: 7.025959200000001
Explanation:
Copper is an example of?
Transition Metal
Noble Gases
Alkali Metal
Halogen
Answer:
Transition Metal
Explanation:
If you look at a periodic table, you can see that Cu is a transition metal.
The empirical formula of hydrazine, molecular mass 32 grams, is NH2. What is the molecular formula of hydrazine?
A) (NH)4
B) N2H4
C) NH
D) NH2
Answer:
B) N2H4
Explanation:
A burning candle demonstrates the following type of energy transformations.
A: chemical → heat → light
B: heat → chemical → light
C: electrical → light
D: chemical → electrical → light
Answer:
B
Explanation:
the candle is hot so the first energy form should be heat. u could now just eliminate the rest but for further notice. the heat melts the wax in the candle, which is a physical change but also the thread is burning out which is a chemical change then light follows
how much heat is required to melt 3.15 mol of solid acetate acid
how many grams of C2H5OH would get if you started with 5.0 g
Answer:
92.13688 grams
Calculate the molarity of a solution that has 18.0 g of glucose, C6H12O6, dissolved in 80.0 g of water.
Answer:
same question
Explanation:
Help pls it’s so hard
Answer:
skip and read this story then complete the problem
Representa la formación del enlace entre las siguientes sustancias, calcula también la diferencia de electronegatividad:
a) La reacción entre el aluminio y el cloro.
b) La reacción entre el sodio y el fósforo
c) La reacción entre litio y el yodo.
d) La reacción entre el estroncio y el azufre.
A) La reacción entre el aluminio y el cloro.
Which of the following has the greatest number of groups or branches?
A hexane
B. 3-ethylhexane
C. 2,3-dimethylpentane
D. 2-methylheptane
*correct answers only*
Answer:
C
Explanation:
Option C should be the correct one, since you have two methyl groups in the alkane (parent) chain.