SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
Snapping an instant cold pack is a
Change in temperature
Formation of gas/bubbles
Formation of precipitate
Release of energy (fire/light)
Change in color
Answer:
Answer
Change in temperature
It is an example of an endothermic reaction. It is absorbing heat.
7. Which of the following changes could be associated with either a chemical change OR a
physical change?
a. The change cannot be reversed
b. Bending of metal
c. New substances formed
d. Change in color
Answer:
a: chemical change because the change cannot be reversed.
b: physical change because the action can be reversed.
c: chemical change.
d:chemical change.
any change that cannot be reversed is a chemical change and any change that can be reversed is a physical change.
What’s the answer????
Answer:
D=Wavelength A=Amplitude C=Crest F=At rest point
Explanation:
Forgive me if I am wrong!
where was hydrogen discovered
Answer:
maybe greece
Explanation:
by henry cavendish in 1766
Below is a phase diagram for Carbon Dioxide. Use this diagram to answer the following question.
In this example we will start the Carbon Dioxide out at a temperature of -20oC and 1 atm of pressure. If the pressure was raised to 100 atm of pressure while still staying at -20oC, what phases would the Carbon Dioxide change between?
______elements that have a longer half-life are more _______ than those that have a shorter half-life.
Answer:
Radioactive elements
Stable
Explanation:
Radioactive elements that have a longer half-life are more stable than those that a shorter half-life.
Half-life is the time taken for half of a radioactive element to decay by half of its original composition.
Now, if a substance have a long half-life, it is more stable and takes time to break down. For atoms with a short life, they are highly unstable and breaks down readily and easily.
What do you predict will happen with the
soap bubble when the bottle is placed into
the hot water?
PLEASE HELP ME !!!!!!!
Answer:
it would be 5,045
Explanation:
because it is closer to 5,000. pls correct me if wrong
A sample of CO2 weighing 86.34g contains how many molecules?
Answer:
1.181 × 10²⁴ molecules CO₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
86.34 g CO₂
Step 2: Identify Conversion
Avogadro's Number
Molar Mass of C - 12.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol
Step 3: Convert
[tex]86.34 \ g \ CO_2(\frac{1 \ mol \ CO_2}{44.01 \ g \ CO_2} )(\frac{6.022 \cdot 10^{23} \ molecules \ CO_2}{1 \ mol \ CO_2} )[/tex] = 1.18141 × 10²⁴ molecules CO₂
Step 4: Check
We are given 4 sig figs. Follow sig fig rules and round.
1.18141 × 10²⁴ molecules CO₂ ≈ 1.181 × 10²⁴ molecules CO₂
if you could choose from having fire or ice powers, what would you choose?
Answer: I would choose ice
Ice is the solid state of water, a normally liquid substance that freezes to the slid state at temperatures of 0 °C (32 °F) or lower and expands to the gaseous state at temperatures of 100 °C (212 °F) or higer
Answer:
fire
Explanation:
just my opinion but.
If you have fire you could melt things and it defeats ice and ice is easily melted.
Fire is good in a "battle" too lol.
When did the rabbit population reach carrying capacity
Answer: The rabbit population reached carrying capacity during the fourth year of the 10 years we set. Introduction: Population densityis the number of individuals in a population per unit of area. Some limiting factors only affect a population when its density reaches a certain level.
Explanation:
A weather balloon is inflated to a volume of 2.2 x 103 L with 374 g of helium. What is the density of helium in grams per liter?
Answer:
The answer is 0.17 g/LExplanation:
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{374}{2.2 \times {10}^{3} } = \frac{17}{100} \\ [/tex]
We have the final answer as
0.17 g/LHope this helps you
Describe the two types of mechanical energy
Answer:
Kinetic energy and potential energy
Explanation:
kinetic energy is when the energy is active and potential energy is when it is about to be active
Which of these products was made using a renewable resource?
O A. Paper plate
O B. Aluminum can
O C. Copper pan
O D. Plastic bag
Answer:
paper plate
Explanation:
A renuable source is a source that would replenish in ones lifetime. Trees make paper and grow in the span of a average human life.
1. A mathematical equation that predicts how a physical phenomenon will behave
hypothesis
2. A predicted experimental outcome based on prior knowledge and experience.
quantitative data
3. The variable that is changed on purpose by the scientist.
independent variable
4. The variables that must be kept constant so as not to bias or influence the results
scientific law
5. Data that is descriptive rather than numerical
qualitative data
6. Data that is numerical
control variable
7. A well tested explanation for why a physical phenomenon occurs
scientific theory
Answer:
1. A mathematical equation that predicts how a physical phenomenon will behave - Scientific law
2. A predicted experimental outcome based on prior knowledge and experience - Hypothesis
3. The variable that is changed on purpose by the scientist - Independent variable
4. The variables that must be kept constant so as not to bias or influence the results - Control variable
5. Data that is descriptive rather than numerical -Qualitative data
6. Data that is numerical - Quantitative data
7. A well tested explanation for why a physical phenomenon occurs - Scientific theory
Explanation:
In the method of science in understanding and explaining phenomena in the universe, observations are made, explanations are put forward, experimented and tested, before conclusions are made. Explanations of some common terms in the scientific process is given below:
1. A scientific law is a mathematical equation that predicts how a physical phenomenon will behave.
2. A hypothesis is a predicted experimental outcome based on prior knowledge and experience.
3. A independent variable is the variable that is changed on purpose by the scientist.
4. A control variable is the variable that must be kept constant so as not to bias or influence the results.
5. Qualitative data is data that is descriptive rather than numerical.
6. Quantitative data is data that is numerical
7. A scientific theory is a well tested explanation for why a physical phenomenon occurs.
what are the properties of iconic compounds?
what are the properties of covalent compounds?
which type of compound is sugar?
someone plzz help!
Answer:
in details
Explanation:
what are the properties of iconic compounds?
Ionic compounds exist in the form of ionic groupings in certain forms called (crystalline forms), and we find in these shapes an organized crystal arrangement of ions so that every ion with a specific charge is attracted to a group of ions with the opposite charge, meaning that one ion is bound by several ionic bonds. At the same time, this explains the presence of ionic compounds usually in the solid state (high density). This situation also explains the high melting and boiling points of these compounds.
One of the most important characteristics of ionic compounds is their inability to conduct electrical conductivity in the solid state due to the ions binding and their inability to move while they become conductive of electricity when they are melted or dissolved in water (ions are free to move in the melt and in the aqueous solution).
And among its most important characteristics:
1- It dissolves in water and does not dissolve with benzene, for example (salt) because water is a polar solvent that can separate ions from each other.
2- It has a high melting point due to the force of electrostatic attraction between the positive and negative ions.
3- Its state is solid under normal conditions, due to the force of the electrostatic attraction between the positive and negative ions.
4- Solid ionic compounds do not conduct electricity, but their solutions with water conduct electricity, because when the compound is solid, the ions are connected to each other, but when the compound is a solution, the ions are free to move and conduct the electromagnetic current.
what are the properties of covalent compounds?
In covalent compounds (unlike ionic compounds), we can talk about independent molecules, as covalent compounds are composed of independent molecules linked together by different bonds (van derval, hydrogen) of varying strength. So there are covalent compounds in all three cases according to the strength of these bonds. There are covalent compounds in a gaseous state (weak bonds between molecules), covalent compounds in a liquid state, and also there are covalent compounds in a solid state (strong bonds between molecules). The same is true for melting and boiling points, so covalent compounds Their boiling and melting points vary according to the quality and strength of the bonds between the molecules.
As for the electrical conductivity, in the pure state, the covalent compounds are mostly non-conductive because they are not originally charged or because they are electrically neutral in the presence of charges, but the charged ones may have what is known as the electric torque and will come.
Likewise, in their smelters, the molten solid covalent compound (such as molten sugar) is not conductive of electricity. As for the solution, it may be non-conductive as in the case of a sugar solution or be conductive as is the case in a solution of hydrogen chloride (hydrochloric acid) and the reason for conducting or not in the solution is due to The covalent compound ionization (conversion into separate ions by the action of a solvent) or its de-ionization.
Sugar does not ionize when dissolved in water. Rather, its molecules only separate from each other, while hydrogen chloride does ionize to the hydrogen ion and the chlorine ion.
which type of compound is sugar?
The chemical or molecular formula for sucrose is C 12 H 22 O 11, which means that each sugar molecule contains 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms. A type of sugar called sucrose is also known as sucrose. It is a sucrase made in many different plants.
The properties of the compounds are the following:
a. The properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.
b. The properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.
c. Sugar is a covalent compound.
What is a covalent compound?Covalent compounds are attracted by covalent bonds. They make bonds by sharing one or more pairs of valence electrons.
What is an ionic compound?These compounds are ions or charged particles. They make bonds when an atom or more atoms lose or gain electrons.
Thus, the properties are a. The properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.
b. The properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.
c. Sugar is a covalent compound.
Learn more about covalent compounds
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what is El Nino and La Nina, and how are they different?
Answer:
El Niño refers to the above-average sea-surface temperatures that periodically develop across the east-central equatorial Pacific. It represents the warm phase of the ENSO cycle. La Niña refers to the periodic cooling of sea-surface temperatures across the east-central equatorial Pacific.
How do i caculate speed
Answer:
Speed uses the same units as velocity, which is meters divided by seconds (m/s)(It doesn't need to be m/s, but it's the most common unit. It's basically any unit of length divided by any unit of time)
hope this helps and good luck
Answer/Explanation:
Speed is a force and is solved by using acceleration.
You can use the problem to solve for force:
F= MA or Force equals mass times acceleration.
Calculate the molecular mass of the following mass of the following chemical compound
C6H12O6
24 G/mol
180 gmol
155 g/mol
19 g/mol
Answer:
132g/mol
Explanation:
Given compound:
C₆H₁₂O₆
Molecular mass of the compound.
This is the sum of the atomic masses of the given elements in the compound;
C = 12
H = 12
O = 6
Molecular mass = 6(12) + 12(1) + 6(16) = 180g/mol
state which separation method you would use to separate potassium iodine solution
The energy of a gamma ray photon whose frequency is 5.02 x 1020 Hz?
Answer:
The energy of photon is 33.28×10⁻¹⁴ J
Explanation:
Given data:
Frequency of photon = 5.02×10²⁰ Hz
Energy of photon = ?
Solution:
E = h.f
h = planc'ks constant = 6.63×10⁻³⁴ Js
by putting values,
E = 6.63×10⁻³⁴ Js × 5.02×10²⁰ Hz
Hz = s⁻¹
E = 33.28×10⁻¹⁴ J
The energy of photon is 33.28×10⁻¹⁴ J.
What types of atoms will experience radioactivity?
Answer:
Alpha particles, Beta particles, Gamma rays
Alpha Is the least harmful
Beta is second most harmful
Gamma is most dangerous
Explanation:
SOMEONE HELP ME PLEASE ILL GIVE BRAINLY!
Is the following picture an example of a chemical change or a physical change?
A chemical change, because the atoms are rearranging to form new molecules.
A physical change, because the molecules are staying the same.
A chemical change, because the molecules are staying the same.
A physical change, because the atoms are rearranging to form new molecules.
Answer:
It would be a physical change, because the atoms are rerranging to form new molecules!
Explanation:
why do large molecules seem to dissapear in the digestive system
Answer:
They must be dissolving.
Explanation:
Acid molecules must cling to remaining food molecules and slowly dissolve them.
HUNK
FREE
IN PE
-05
HAE
-B. AFFEE
EMME
"Lanthanide serie
**Actinide series
Where are the non metals located
Answer:
What??? I don't understand.
Explanation:
CFCs were found to destroy what important compound in our atmosphere?
A: ozone
B: nitrogen
C: water vapor
D: helium
Answer:
A: ozone
Explanation:
Chlorofluorocarbons (CFCs) and hydrofluorocarbons (HCFCs) destroy ozone in the stratosphere.Answer:
A: ozone
Explanation:
right on EDGE 2021
Can someone please help me with this?-- 18 pts!
2C10H11NO4 + 2H2O → C16H10N2O2 + 2C2H4O2 + 4H2O
In this reaction, 1.87 g of indigo (C16H10N2O2) are produced.
If the theoretical yield is 2.35 g of C16H10N2O2, what is the percent yield of indigo?
Round to the nearest decimal.
The percent yield of indigo : 79.6%
Further explanationPercent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
2C₁₀H₁₁NO₄ + 2H₂O → C₁₆H₁₀N₂O₂ + 2C₂H₄O₂ + 4H₂O
Actual yield = 1.87 g
Theoretical yield = 2.35 g
The percent yield of indigo :
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{1.87}{2.35}\times 100\%=\boxed{\bold{79.6\%}}[/tex]
2.
Which one of the following substances is a compound?
A. Hydrogen
B. Tron
C. Oxygen
D. Sodium fluoride
Explain your answer:
This is the balanced chemical equation for a reaction
between acetic acid (in vinegar) and sodium bicarbonate
(in baking soda).
C,H,O, + NaHCo, NaC,H,O, + H2O + CO2
Acetic acid
Water
Sodium
bicarbonate
Sodium
acetate
Carbon
dioxide
How does this balanced chemical equation represent the conservation of
matter in the chemical reaction?
O A. The coefficients are the same for each compound represented in
the reactants and products.
B. There are more carbon (C) atoms represented on the left-hand
side than on the right-hand side.
C. The amount of matter on the left-hand side is the same as the
amount of matter on the right-hand side.
D. There are more compounds on the right hand side than there are
on the left-hand side,
Answer:
C is the correct answer :)
Explanation:
In a balanced chemical equation, the amount of matter on the left-hand side of the chemical equation is the same as the amount of matter on the right-hand side. Therefore, option C is correct.
What is the balanced chemical equation?A balanced equation in which the number of atoms of each element is equal on the reactant, as well as the product side of the chemical equation.
The law of conservation of matter follows every balanced chemical equation. According to the law of conservation of matter, in a chemical reaction, matter can never be created or destroyed.
By obeying this law, the total amount of matter on the reactant side should be equal to the total amount of matter on the product side in a balanced chemical equation.
Given the reaction between acetic acid and sodium bicarbonate:
[tex]CH_3COOH + NaHCO_3\longrightarrow CH_3COONa +H_2O + CO_2[/tex]
The number of atoms of carbon, hydrogen, oxygen, and Na are equal on both sides of the reaction.
Learn more about the balanced chemical equation, here:
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Atoms don’t absorb all wavelengths of light because of…
a. Their valence electrons
b. Their shells
c. Their color
d. They do absorb all wavelengths of light
Answer:
b. Their shells
Explanation:
The electronic shell of atoms represents the energy levels in a particular atom.
To understand the way atoms absorb energy, we must know that the wavelength absorbed is commensurate with the energy of the atom. This available energy allows for specific amount of energy to be absorbed.
Therefore, the electronic shell in an atom determines the absorption wavelength of the atom.