Answer:
B.) A new substance is not formed
Explanation:
hope this helps
Ice melting is not a chemical change because a new substance is not formed.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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What are you doing when you're making sound?
Causing air pressure to drop.
Causing electromagnetic waves to radiate.
Causing photons to travel.
Causing air molecules to vibrate.
How is calcium essential to your life?
Answer The body also needs calcium for muscles to move and for nerves to carry messages between the brain and every body part. In addition, calcium is used to help blood vessels move blood throughout the body and to help release hormones and enzymes that affect almost every function in the human body
Explanation:
Answer:
Calcium is a mineral for humans which is really important.It helps you be healthy and be in shape(mostly your teeth and your bones).Calcium also keeps your blood and muscles moving and helps your nerves send messages from your brain to the rest of your body.Calcium helps you a lot and is essential to your life.
Hope that was helpful.Thank you!!!
Will P and O2 share or transfer electrons?
P + O2 →P4,O10
Answer:
They will share electrons .
Explanation:
When P and O2 reacts, they will share electrons as both of the elements are non-metals.
Only metal elements such as K , Na , Ca , etc. can transfer electrons to the other non-metal elements.
Select the correct answer.
An inflatable toy starts with 1.05 moles of air and a volume of 5.17 liters. When fully inflated, the volume is 8.00 liters. If the pressure and
temperature inside the toy don't change, how many moles of air does the toy now contain?
A
2.05 mol
B. 1.62 mol
C. 1.55 mol
D. 0.679 mol
Answer:
b
Explanation:
which of the following would form a heterogeneous mixture?
A. A mixture of a solute and a solvent
B. A mixture of polar and non polar liquids
C. A mixture of an electrolyte and water
D. A mixture of two soluble liquids
Answer:
A. A mixture of a solute and a solvent
Explanation:
The composition of the solute dissolved in the solvent to form the solution that is not uniform and same throughout the solution of the mixture is a heterogeneous mixture.
Answer:
B
Explanation:
Like dissolves like. A mixture of polar and no polar liquids wouldn't mix because they are dissimilar. So it would be like water and oil.
Also cuz I just did the quiz and it was right.
Question 14
The average person in one minute exhales 2.5 g of CO2. How many molecules of CO2 are exhaled?
Answer:
.15625
Explanation:
for each gram there is .0625 molecules
Ernest Rutherford discovered that atoms were mostly:
Negatively charged
Positively charged
Electrons
Empty space
Answer:
The answer is positively charged.
Explanation:
The Rutherford model supplanted the atomic model of English physicist Sir J.J. Thomson, in where the electrons were set in a positively charged atom.
Compared with Earth, the Moon has a surface that is geologically less active. For example
A.
both the Moon and the Earth have continents that move around.
B.
the Moon has many active volcanoes, while the Earth has none.
C.
the Moon has no active volcanoes, while the Earth has many.
D.
the Moon has continents that move around, while the Earth does not.
1. Given below are the figures showing particles of a matter in its three
states at the same temperature and pressure and contained in separate
containers of the same volume. The circles indicate the particles in the
three states of a matter.
O
0
O
O
0
O
o
o
o
O
0000000
0000000
0000000
0000000
oooo
O
(iii)
Which figure shows minimum attraction between the particles of the
matter?
(a) Figure (i)
(b) Figure (ii)
(c) Figure (iii)
(d) The figures do not indicate any thing about the inter particle
attraction.
Answer:the answer is c
Explanation:
According to the forces of attraction,figure 1 shows minimum attraction between the particles of the matter.
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
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How many moles of NaCl are present in 530 ml of a 1.52m NaCl solution
Answer:
805.6 moles
Explanation:
Molarity = 1.52mL
Volume = 530mL
1.52 moles is present in 1mL,
1mL = 0.001L
1.52 moles = 0.001L
X moles = 0.53L
X = (1.52 × 0.53) / 0.001
X = 805.6moles
805.6moles is present in 530mL or 0.52L
Which statement describes a chemical property of iron?
Iron oxidizes.
Iron is a solid at STP.
Iron melts.
Iron is attracted to a magnet.
Answer:
iron oxidizes
Explanation:
Being a solid, melting, and attraction are all physical properties.
Iron oxidizes is a chemical property of iron. Hence, option A is correct.
What is a chemical property?A chemical property is a characteristic of a particular substance that can be observed in a chemical reaction.
Iron is known to react with oxygen ([tex]O_2[/tex]) in water or air moisture to form various insoluble iron oxide compounds described commonly as rust; there are sixteen known iron oxides and oxyhydroxides.
The most common iron oxides are ferrihydrite ([tex]Fe_2O_30.5H_2O[/tex]), hematite ([tex]Fe_2O_3[/tex]) and magnetite ([tex]Fe_3O_4[/tex]).
Hence, option A is correct.
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this is the last week of school for me and i need help pleaseee !!
Answer the following prompt in a CER format:
Cold Packs are often used to treat injuries. Cold Packs are designed in such a way that
when the pack gets snapped, it breaks the vessel allowing all of the reactants to mix.
Upon mixing the pack gets very cold. Is the reaction in the cold pack an endothermic or exothermic reaction. Write a CER to defend your answer.
Answer:
The reaction in the cold pack is an endothermic reaction
Explanation:
An endothermic reaction is a reaction that absorbs energy (heat) from the surrounding to supply the required energy of activation that allows the occurrence of the reaction
Therefore, when a reaction is endothermic, it boundary or the system where the reaction is occurring feels cold to touch
Hence, the reaction in the cold pack is an endothermic reaction.
The reaction in a cold pack is exothermic, as it releases heat energy to create the cooling effect.
Explanation:Cold packs are designed to treat injuries by providing a cooling effect. When the pack is snapped, a chemical reaction occurs inside the pack, resulting in the release of cold temperatures. This reaction is exothermic because it releases heat energy to the surroundings.
Inside the cold pack, there are reactants separated by a barrier. When the pack is snapped, the barrier breaks, allowing the reactants to mix. One common reactant in cold packs is ammonium nitrate, and when it is mixed with water, it undergoes an exothermic reaction. This reaction releases energy in the form of heat, making the pack feel cold.
In conclusion, the reaction in a cold pack is exothermic because it releases heat energy, resulting in the pack feeling cold when activated.
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What is true of a compound?
It does not always retain the properties of the substances that make it up
It requires electrical energy to make
It requires heat energy to make
It must have water as one of its components
Answer:
It does not always retain the properties of the substances that make it up
Explanation:
Answer:
A/1
Explanation:
Compounds do NOT always retain the properties of the substances that make it up.
On a cold winter day, the heat from inside leaks out of the house, primarily
through the windows.
A. True
B. False
The statement is true. Inside heat tends to escape from a house on a cold winter day, primarily through the poorly insulated parts like windows and doors. The principle of heat transfer, specifically conduction, explains this phenomenon.
Explanation:The statement is True. On a cold winter day, the heat from inside a house tends to move to the colder outside environment, and this flow of heat usually occurs predominantly through the windows and doors if they are not properly insulated. This phenomenon is explained by the principle of heat transfer, specifically the mechanism called conduction, where thermal energy is transferred from a hotter object to a colder one.
Windows, particularly those that are single-pane, are usually not very good insulators, so they can allow a significant amount of heat to escape. This is why in cold climates, it's common to use double-pane or even triple-pane windows, which have air or another insulating material between the panes to reduce heat loss.
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Describe at least three ways our understanding of the atom has changed. See the hint in the reference image.
Our understanding of the atom has changed through the discovery of subatomic particles, the development of quantum theory, and advancements in imaging technology.
Explanation:Our understanding of the atom has changed significantly over time. Here are three ways our understanding has evolved:
The discovery of subatomic particles: In the early 20th century, scientists such as J.J. Thomson, Robert Millikan, and Ernest Rutherford conducted experiments that led to the discovery of electrons, protons, and neutrons. This helped establish the idea that atoms are composed of smaller particles.The development of quantum theory: In the early 20th century, quantum theory revolutionized our understanding of atoms by explaining the behavior of electrons. It introduced the concept of electron energy levels and the wave-particle duality of electrons.Advancements in imaging technology: With the development of scanning tunneling microscopes and other imaging techniques, scientists have been able to directly observe individual atoms and molecules. This has provided insights into their structures and arrangements.Learn more about Evolution of Atomic Theory here:https://brainly.com/question/1156232
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Which of these is a physical property?
A malleable
B easy to digest
C does not burn
D become moldy quickly
Answer:
malleable
Explanation:
able to be bended into shape
To measure the mass of a vitamin tablet, use: liters (L)
kilograms (kg)
milligrams (mg)
millimeters (mm)
Answer:
mg
Explanation:
How can the solubility of a gas in a liquid be increased?
How do yo know when your in love ?
Answer:
Play the 24 signs you're falling in love bingo I attached lol (I hope this isn't for school)
Explanation:
What type of solution would you have if you dissolved 60g of Na HASO4 in 100g of 60°C water?
Solubility vs. Temperature for a variety of salts
Solubility (g salt/100 g H20)
Naci
- NazHASO4
+ Ba(NO3)2
Naz804
. Ce2(SO4)3•9H20
10 20
Temperature (°C)
30
40
50
60
70
80
90
100
OOOO
saturated
Cannot be determined
unsaturated
supersaturated
The type of solution you have if you dissolved 60g of NaHSO[tex]_4[/tex] in 100g of 60°C water is unsaturated.
What are saturated and unsaturated solution?A solute is dissolved in a solvent to form a solution. We refer to the final mixture as a solution. There is an absolute maximum of solute that can be dissolved in a given solvent at any given pressure and temperature for the solute to stay dissolved inside the solution phase.
Unsaturated solutions have the ability to dissolve more solutes than saturated ones. Since these solutions have not yet reached saturation, a precipitate just at bottom would never be present. From a distance, a solution that is nearly saturated and one that is not would resemble one another. The type of solution you have if you dissolved 60g of NaHSO[tex]_4[/tex] in 100g of 60°C water is unsaturated.
Therefore, the type of solution you have if you dissolved 60g of NaHSO[tex]_4[/tex] in 100g of 60°C water is unsaturated.
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Which statements accurately describe the roles of decomposers in the carbon cycle? Select three options. Decomposers release carbon dioxide into the air as waste. Decomposers remove carbon dioxide from the air during photosynthesis. Decomposers break down the remains of dead plants and animals. Decomposers return carbon compounds to the soil. Decomposers use carbon to make food molecules.
Answer:
1,3,4
Explanation:
just took the test
The three statements that accurately describe the roles of decomposers in the carbon cycle are:
Decomposers release carbon dioxide into the air as waste.Decomposers break down the remains of dead plants and animals. Decomposers return carbon compounds to the soil.DECOMPOSERS:
Decomposers are organisms capable of breaking down dead organic matter. Decomposers include bacteria, fungi etc. Decomposers play a vital role in recycling of nutrients and carbon in the atmosphere. They break down dead organic matter and release the components into the atmosphere.Decomposers perform the following functions as it relates to the carbon cycle:
Decomposers release carbon dioxide into the air as waste.Decomposers break down the remains of dead plants and animals. Decomposers return carbon compounds to the soil.Learn more at: https://brainly.com/question/16599318?referrer=searchResults
A solution is observed to have a sour taste, it turns litmus paper a pinkish/red color, and is
corrosive to living tissue. Which relationship between ions shown below is correct for this
solution?
A.)[H'] > [OH']
B.)[H') <[OH']
C.)[H] = [OH)
D.)More information is needed
Answer:
Option (A.) [H+] > [OH-]
Explanation:
From the question given, we understood that the solution is:
1. Has a sour taste.
2. It turns litmus paper into pinkish /red.
3. It corrosive to living tissue.
The above information proofs that the solution is acidic because all the listed characters of the solution are exactly the characteristics of an acid solution.
Since the solution is acidic, it therefore means that the concentration of Hydrogen ion, [H+] is more than the concentration of Hydroxide ion, [OH-] .
Option A gives the correct answer to the question.
Answer:
The correct option is;
A.) [H⁺] > [OH⁻]
Explanation:
The given properties of the solution are;
1, Turns litmus paper pinkish/red
2. Corrosive to living tissue
Since the solution turns the litmus paper red, we recall that blue or neutral litmus paper turns to red when placed in an acid solution, therefore, the solution is an acid
We are also given that the solution is corrosive to living tissue, therefore, the solution is a strong acid
Fromm the above, the number of hydrogen ions, [H⁺] in the solution is much more than the number of hydroxyl ion [OH⁻]
Hence, the correct option is A.) [H⁺] > [OH⁻].
THIS IS A SCIENCE QUESTION NOT A CHEMISTRY QUESTION! Why does the same side of the moon always face Earth?
the rotational period of Earth is the same as that of the moon
the rotational period of Earth is equal to one revolution around Earth
the rotational period of the moon is equal to one revolution around Earth
the rotational period of the moon is different than one revolution around Earth
Answer:
I belive it is C. but im not 100% sure.
Explanation:
Which statement is true about this reaction?
14N+ H-50
It is a practical source of energy on Earth.
It occurs only outside the solar system.
Its product is heavier than each of its reactants.
It shows the critical mass of an element.
D
Question 3
1.25 pts
An increase in temperature in a system causes and
Increase in both entropy and enthalpy.
decrease in both entropy and enthabu
increase in entropy and a decrease in
decrease in entropy and an increase
enthal
Answer:
d
Explanation:
which of the following electromagnetic waves has the highest energy?
a. ultraviolet waves
b. infrared waves
c. microwaves
d. radio waves
The term "electromagnetic" refers to the electrical and magnetic forces and effects that an electric current produces. Ultraviolet waves electromagnetic waves has the highest energy.
What is electromagnetic waves ?The interactions between an electric field as well as a magnetic field produce waves known as electromagnetic waves, or EM waves. In other words, magnetic and electric fields oscillation to produce electromagnetic (EM) waves.
Radio and television waves, microwaves, infrared rays, visible light, ultraviolet light, X-rays, and gamma rays are all examples of electromagnetic waves that propagate across space independently of matter.
An changing magnetic field will cause an altering electric field, and vice versa. Electromagnetic waves are created from these shifting fields. In contrast to mechanical waves, electromagnetic waves may travel without a medium.
Thus, option A is correct.
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What does it mean if something is insoluble
Answer:
insoluble simply means something that cannot be dissolved in water (:
A scientist is investigating the effects of electromagnetic radiation on plant growth. She wants to test the plants with two different types of electromagnetic
waves: one with a very long wavelength and one with a very short wavelength. Ideally, the waves will have the greatest possible difference in wavelength.
Which two types of waves should she choose?
To maximize the difference in wavelength for the plant growth experiment, the scientist should use radio waves for the long wavelength and gamma rays for the short wavelength.
The question deals with the investigation of the effects of electromagnetic radiation on plant growth, focusing on the difference in wavelengths of the radiation used. To have the greatest possible difference in wavelength, the scientist should choose radio waves for the very long wavelength and gamma rays for the very short wavelength. Radio waves have the longest wavelengths in the electromagnetic spectrum and carry the least energy, somewhat analogous to making wide waves with a rope using little effort. On the other hand, gamma rays have the shortest wavelengths and carry the most energy, similar to creating short, tight waves in a rope which requires significantly more energy.
True or False: Newton's first law of motion states that an object at rest will stay at rest, and an object in motion will stay in motion, unless acted on by an unbalanced force?
Answer:
True
Explanation:
How should the student label each circle in this diagram?
reaction A: chemical; reaction B: nuclear
reaction A: nuclear; reaction B: chemical
reaction A: strong nuclear; reaction B: weak nuclear
reaction A: weak nuclear; reaction B: strong nuclear
Answer:
Reaction A: Chemical; reaction B; nuclear
Explanation: Hope this helps :)
The diagram will be labelled as reaction A: chemical reaction , B: nuclear reaction.
What is a nuclear reaction ?The reactions that involve change in the identity or characteristics of an atomic nucleus, induced by bombarding it with an energetic particle.
The bombarding particle may be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion.
In the given diagram , It can be seen that in the first circle it is written that it happens outside the nucleus , electrons are involved and less energy is released , these are the traits of a chemical reaction
In the second circle it can be seen that neutrons are involved , the reaction is happening inside the nucleus and relatively large amount of energy is released, these are the traits of a nuclear reaction.
Therefore the diagram will be labelled as reaction A: chemical reaction B: nuclear reaction
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