Answer:
The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question. In a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition
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Which of the following is an example of a chemical change?
A- The shell of an egg breaks when it is struck against a hard surface.
B- Chocolate squares are melted to make cake icing.
C- Flour and sugar are sifted together into a measuring cup.
D- A mixture of flour, sugar, eggs, and butter is baked to become a cake.
Answer:
D
Explanation:
It is D because once youve put together the ingredients and baked it you can not go in and taake out every ingredient and put it back to how it was before (Please also try to help me with my question it it about scaled copies, Please and thank you!)
Answer:
I believe the answer is B. Chocolate squares are melted to make cake icing.
Explanation:
Which activity is the result of cell division at work
1. A bone breaks
2. A plant wilts
3. A wound heals
4. A meal is digested
what is 0.000980 in scientific notation
Answer:
9.80x10^-4
Explanation:
Answer:
9.80 x 10⁻⁴
Explanation:
The negative means that the decimal place was moved to the right and the exponent tells you how many places it was moved.
Which material is the best conductor? Which material is the best insulator? Which material would enable you to warm your hands the fastest?
LDPE
HDPE
latex
Mylar
Neoprene
Answer:
Mylar
Explanation:
The metals are good conductors of electricity whereas plastics and wood are referred to as the insulators. Here all the given options are insulators. The best insulator is Mylar. The correct option is D.
What are conductors and insulators?The materials which allow electricity to flow through them is defined as the conductors whereas the substances which resist or do not allow the current to pass through them are called the insulators.
The human body is a best conductor and the conductor has free electrons on their surface. The insulators are solid in nature and they do not have free electrons at all.
The term Mylar is also called the plastic films. It is one of the most recognized and widely used polyester films. It is an excellent electrical insulator which can effectively trap heat.
Here LDPE is a poor conductor of electricity and HDPE is chemically inert. The latex and neoprene are forms of rubber which does not conduct electricity.
Thus the correct option is D.
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Scandium (II) Oxide
A. ScO2
B. Sc2O2
C. ScO
D. ScC2O4
how does water get back into the atmosphere
Water gets back into the atmosphere because of the water cycle. The water cycle includes evaporation, precipitation and more. water from the ocean evaporates due to the sun and then precipatates as rain.
Explain what is Thermal Energy
Answer:
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process
Explanation:
thermal energy Is just heat
how many atoms are in 3Mg(OH)2
In a formula unit of Mg(OH)₂, there are one magnesium ion and two hydroxide ions; or one magnesium, two oxygen, and two hydrogen atoms.
What is Formula Unit ?A formula unit is the chemical formula of an ionic compound that lists the ions in the lowest ratio that equals a neutral electrical charge.
In chemistry, we use chemical formulas to describe the number of elements or molecules that make up a substance.
Therefore , In a formula unit of Mg(OH)₂, there are one magnesium ion and two hydroxide ions; or one magnesium, two oxygen, and two hydrogen atoms.
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Imagine you have two beakers. Both beakers are filled with the same amount of water. The water in both beakers is the same temperature as well. You add 50 g of Substance A to the first beaker, and 50 g of Substance B to the second beaker. After stirring both beakers, there is a small pile of Substance A at the bottom of the first beaker. None of Substance B is visible in the second beaker. Which of the following statements is true? A. Substance A is less soluble in water than Substance B. B. Substance A is more soluble in water than Substance B. C. Substance A is not soluble in water. D. Substance B is not soluble in water.
Answer:
A.) Substance A is less soluble in water than Substance B.
Explanation:
Substance A is less soluble in water than Substance B.
What is Solubility?
This is defined as the ability of a substance, the solute, to form a solution with another substance, the solvent.
We were told that small particles were present in Substance A and none in Substance B which means all was dissolved which is why option A was chosen as the most appropriate choice.
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Which of these best describes the relationship between density and the rate of heat transfer?
A.) Heat transfers between objects regardless of density.
B.) The greater the difference in densities between objects, the slower the heat will transfer.
C.) The less dense the object, the faster the heat will transfer.
D.) The denser the object the faster the heat will transfer.
Answer:
C.) The less dense the object, the faster the heat will transfer.
How many strips can you eat before you turn your skin pink? THIS IS KEEPING ME UP 24/7 ALL NIGHT!! HOW MANY!!!
Answer: ???? Chicken strips?
Explanation:None
Answer:
my input on this question is 69,420
Scientists can identify an element by looking at the structure of a single A.molecule. B.electron. C.neutron. D.atom.
By definition, the correct answer is option D. Scientists can identify an element by looking at the structure of a single atom because the number of protons can be determined, and thus its identity.
All atoms are composed of a central nucleus in which there are particles with a positive electric charge, the protons, and neutron, which is an electrically neutral subatomic particle, around which other particles with a negative electric charge that are electrons move.
Thus, the atom is electrically neutral, since the positive charge of the protons is compensated by the negative charge of the electrons.
Atoms of different elements have different amounts of protons. The atomic number (which is identified by the letter Z) indicates the amount of protons that is present in the nucleus of an atom.
This number is then responsible for defining the electronic configuration of the atom and the chemical properties of the element. Then it is possible to say that the number of protons in the nucleus, that is to say the atomic number Z, of an atom determines its identity.
Finally, the correct answer is option D. Scientists can identify an element by looking at the structure of a single atom because the number of protons can be determined, and thus its identity.
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https://brainly.com/question/5527493?referrer=searchResultshttps://brainly.com/question/244453817. Crive reason :
a) CO₂ as
oxide
Calculate the mass of 9.75x1021 atoms of helium.
Answer: 99.5475
Hope this helps(:
Materials
Crayon
Table 2. Investigating crayons and candle when heated
Property before
heating
Property after heating
Answer:
1 - Crayon
Before heating is solid
After heating is liquid
2 - Candle
Before heating is solid
After heating is liquid
Explanation:
Crayon when heated become liquid at a temperature of 115 degrees Fahrenheit or above. When the temperature reached to 120 degrees Fahrenheit for crayon it melts down completely.
When Candle is heated it melts and liquid form of wax falls off which again becomes solid in second after reaching the floor. The melting point of candle is 130 degree Fahrenheit or above.
19. Why should all measurements be done multiple times?
Answer:
Increasing precision with multiple measurements
Explanation:
The more measurements you take (provided there is no problem with the clock!), the better your estimate will be. Taking multiple measurements also allows you to better estimate the uncertainty in your measurements by checking how reproducible the measurements are.
Answer:
All measurements should be done twice to absolutely make sure that you have the correct measurement and to avoid any mistakes if you are like building lets say a table or doing a equation. The saying is measure twice cut once
Explanation:
The solution in the beaker was a green color. This is an example of
Answer:
That means its a Transition Metal!
Explanation:
As you move left to right across a period, which of the following always increases?
A)
Atomic number
B)
Atomic mass
C)
Atomic weight
D)
Shell number
Answer:
A) Atomic number
Explanation:
if the latitude is high does it mean it’s is hot or cold PLEASE HELP
Answer:
cold
Explanation:
cold is when it get high on lattitude
which of the following is a part of daltons atomic theory select all that apply
Answer:
Stewie Griffin
Explanation:
Mohs Scale of Mineral Hardness Hardness Mineral Absolute Hardness 1 Talc 1 2 Gypsum 2 3 Calcite 9 4 Fluorite 21 5 Apatite 48 7 Quartz 100 8 Topaz 200 According to the Moh's Scale of Mineral Hardness, the sample mineral that will scratch gypsum but not apatite is MOST LIKELY A) calcite. B) quartz. C) talc. D) topaz.
Answer: A) calcite
Explanation:
Hardness can be defined as the ability of the mineral to resist the scratch. It is the property to judge the hardness of the mineral. Mineralogist study this property of hardness using Mohs hardness scale.
Talc is the least hard substance after that gypsum, then calcite, fluorite, and then apatite.
The gypsum can be scratched by the calcite but the calcite cannot scratch apatite as it is softer than apatite.
Noble gases are ________ because they have ______ outer shell electrons. A. very reactive, 1 B. inert, 8 C. inert, 0 D. very reactive, 8
Answer:
B
Explanation:
They don't react to other elements because their valence shell is already full.
Noble gases are inert because they have 8 outer shell electrons.
The correct answer is B) inert, 8
What is an electron quick answer?
An electron is a negatively charged subatomic particle. It is able to be either loose (no longer attached to any atom), or bound to the nucleus of an atom. Electrons in atoms exist in spherical shells of diverse radii, representing electricity ranges.
What number of electrons are in the outer shell?A maximum of the elements essential in biology want eight electrons in their outermost shell for you to be stable, and this rule of thumb is referred to as the octet rule.
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which property of matter changes during a chemical change but not during a physical change
Answer:In a physical change, atoms are not rearranged and the matter's physical and chemical properties are unchanged. Chemical changes, on the other hand, rearrange the atoms of matter in new combinations, resulting in matter with new physical and chemical properties.
Explanation:
easy
Florida is the __________________ "capital" of the US?
Answer:
Orange
Explanation:
Answer:
tropical
Explanation:
tropical tropical
When a carbon atom joints chemically with an oxygen atom it makes carbon monoxide what is the term for carbon monoxide?
a. a molecule
b. a mixture
c. an alloy
d. an element
Answer:
A
Explanation:
I learned this last year
How can you remove energy from matter?
A By increasing its volume
B By lowering its temperature
C By increasing its pressure
D By boiling it
Answer:
you can remove energy from the matter by lowering its temperature
Lowering matter's temperature is an efficient way to take energy out of it.
B) By lowering its temperature is correct
What is energy?Energy is the quantifiable quality that is transferred to a body or a physical system and is noticeable in the performance of work as well as in the form of heat and light.
Energy is a conserved resource; according to the law of conservation of energy, energy can only change its form; it cannot be created or destroyed.
Primary energy sources come in a variety of forms, such as nuclear energy and fossil fuel energy.
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ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
Nitrogen(N) is made up of 99.632% 14N and 0.368% 15N.
The atomic mass of 14N is 14.003 amu. The atomic mass of 15N is 15.000 amu.
What is the average atomic mass of nitrogen?
14.0 amu
14.006 amu
15.00 amu
15.50 amu
Answer:
14.006
Explanation:
A trainer wanted to train a dolphin to do a different trick every day and compare it with the trick on the original day to see how many tricks the dolphin
could learn to do.
The following chemical reaction is balanced, but
the coefficients used are larger than necessary. Rewrite this balanced equation using the smallest coefficients possible.
9Fe(s) + 12H20(I) — 3Fe3O4(s) + 12H2(9)
Answer:
Explanation:
Divide each coefficient by 3:
3Fe(s) + 4H2O(l) ---> Fe3O4(s) + 4H2(g)
The balanced equation using the smallest coefficients possible:
3 Fe (s) + 4 H₂O (I) → Fe₃O₄ (s) + 4 H₂ (g)
What is the balanced chemical equation?A chemical equation can express a chemical reaction in terms of chemical symbols of the substances. A chemical equation exhibits reactants, products, and an arrow representing the direction of the reaction.
A balanced chemical equation exhibits an equal number of atoms of each element is equal on either side of the equation. From the law of conservation of mass, the total mass of the elements on both sides of the chemical equation.
Given, a chemical reaction is balanced, but the coefficients used are larger than required:
9Fe (s) + 12 H₂O (I) → 3 Fe₃O₄ (s) + 12 H₂ (g)
Divide the coefficients by 3 to get the smallest coefficients:
The chemical equation becomes:
3Fe (s) + 4 H₂O (I) → Fe₃O₄ (s) + 4 H₂ (g)
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Which of the following is a homogeneous mixture? a. Na(s) b. H2O(l) c. Cl2(g) d. NaCl(aq)
pls help
Answer:
H²0 is answer is H20 ok please