Answer:
What kind of properties result in the substance changing into a new substance?
A) Liquid Properties
B) Physical Properties
C) Chemical Properties
D) Real Properties
Edit: I don't like that question, so here another one instead...
Which of the following statement is incorrect for a chemical reaction?
A) Heat may be given out but never absorbed.
B) Sound may be produced.
C) A color change may take place.
D) A gas may be evolved
Explanation:
Answer:
Which of the following matches the correct definition to an example?
A. Chemical Change: My foot changes color
B. Physical Change: My microwave exploded
C. Chemical Change: My dog ate my homework
D. Physical Change: My homework burned in a fire
Also can u pls mark me brainliest im new pls
Energy must be removed from a liquid to change it to a solid.
True or false?
Answer: F
Explanation:
Brainlist me
A solution containing 15.2 g of BaBr2 is reacted with a solution containing excess Na3PO4 to form 9.50 g of precipitate. What is the percent yield of the reaction?
Answer:
Explanation:
3BaBr₂ + 2Na₃PO₄ = 6BaBr + Ba₃(PO₄)₂ (s)
3 x 297 = 891 gm 1 x 602 = 602 gm
891 gram of BaBr₂ yields 602 gram of precipitate
15.2 gram of BaBr₂ yields 602 x 15.2 / 891 gram of precipitate
= 10.23 gram
actual yield = 9.5 gram
percent yield = 9.5 x 100 / 10.23
= 92.86 % .
The two gases, H2 and O2, were allowed to effuse under the same conditions through a pinhole. If the rate of effusion of O2 was 4.80 x 10-2 ms-1, what is the rate of effusion of H2?
The rate of effusion of H₂ : 7.2 x 10⁻² m/s
Further explanationGraham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or
the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
or
[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]
MW₁ O₂ = 32 g/mol
MW₂ H₂ = 2 g/mol
[tex]\tt \dfrac{1.8\times 10^{-2}}{r_2}=\sqrt{\dfrac{2}{32} }\\\\\dfrac{(1.8\times 10^{-2})^2}{r_2^2}=\dfrac{2}{32}\\\\r_2=0.072=7.2\times 10^{-2}~m/s[/tex]
Which of the following is an example of a chemical change?
A. Sugar Dissolving
B. Eggs frying
C. Ice melting
D. Flour and salt being mixed together
Answer:
Eggs Frying
Explanation:
;)
The Top Thrill Dragster, a rollercoaster at Cedar Point in Ohio, soars through the air at 176ft/sec. How fast is this in mph?
The rollercoaster has a speed of 176 ft/sec. This can be converted to miles per hour. The speed is equivalent to 120 mph.
What is speed ?Speed is a physical quantity measuring the distance travelled by an object per unit time. Speed is a scalar quantity. The rate of speed is called velocity.
The speed can be expressed in different units. such as m/s, km/h, ft./s miles per hour etc. These units can be interconverted using specific relations.
One ft/s = 0.682 mph
then, 176 ft./s = 0.682 × 176 = 120 mph.
Therefore, the speed of the roller coaster is 120 mph.
Find more on speed:
https://brainly.com/question/7359669
#SPJ1
Wasim and his friends want to test if the solution of a substance is acidic or not. These are the tests that each of them performed. Wasim: Dipped the blue litmus in the solution Akram: Dipped the red litmus in the solution Neha: Dipped both the blue and the red litmus in the solution one after other. Who among them performed a proper test ?
Answer:
Wasim and Nehra did the Proper testing
Explanation:
In acidic condition Blue litmus turns red
In basic condition Red litmus turns Blue
In order to test an Acidic solution we need Blue litmus.
Wasim Dipped the blue litmus in the solution : it will turn red and shows acid
Akram Dipped the red litmus in the solution : No it will not show, it's a test for base
Neha: Dipped both the blue and the red litmus in the solution one after other.
Blue litmus will turn red which will show Acidic nature, after that Adding Red litmus in it will not show any change as Red litmus only changes in Basic condition.
Therefore, Wasim and Nehra did the Proper testing
1. The speed limit on most city streets is (25 miles). How many meters per minute
hour
is this?
This is a conversion.
Answer:
[tex]Speed = 670.56 \frac{m}{min}[/tex]
Explanation:
Given
[tex]Speed = \frac{25 mi}{hr}[/tex]
Required
Convert to meters per minutes
[tex]Speed = \frac{25 mi}{hr}[/tex]
Start by converting the speed from miles to meters
[tex]1\ mile = 1609.34\ meters.[/tex]
So, we have:
[tex]Speed = \frac{25 * 1609.34\ m}{hr}[/tex]
[tex]Speed = \frac{40233.5\ m}{hr}[/tex]
Next, we convert time from hours to minutes
[tex]1\ hour = 60\ minutes[/tex]
So, we have:
[tex]Speed = \frac{40233.5\ m}{60\ min}[/tex]
[tex]Speed = 670.56 \frac{m}{min}[/tex]
Hence, the equivalent of 25 miles per hour is 670.56 meters per minutes
Find the mass, in grams, of 7.50×1024 formula units of aluminum oxide.
2
Which group of substances contains only compounds?
A C, O2, CH4,
B H, He, F
C CO2, CaCO3 , CH4
D F, Fe, He
<
What is the chemical formula for the name lithium fluoride?
Answer: Lithium fluoride is an inorganic compound with the chemical formula LiF.
Answer:
The chemical formula for lithium fluoride is LiF. I hope this helps
Which equation is balanced?
Mg3N2 + H2O 3MgO + 2NH3
C3H8 + 5O2 H2O + 3CO2
Zn + 2HCl ZnCl2 + H2
3H2SO4 + 2Fe Fe2(SO4)3 + H2
Answer:
it's the third one
Explanation:
in the first one oxygen molecules aren't balanced
the second ok me oxygen isnt balanced
and the fourth one hydrogen isn't balanced
hope it helps ;)
A balanced equation is a representation in which the coefficients of the individual atoms of a molecule or compound are the same on both the left and right of the equation.
The correct answer is:
Option C. Zn + 2 HCl --------> ZnCl₂ + H₂
This can be explained as:
In the first equation, the number of H and O atoms are not balanced.In the second case, the atoms of hydrogen and oxygen are not the same on the sides of the equation.In the third reaction between zinc and hydrochloric acid, all the atoms of the reaction are balanced.In the fourth reaction, the hydrogen atoms are not balanced.Therefore zinc and hydrochloric acid reaction are balanced.
To learn more about balancing the reactions follow the link:
https://brainly.com/question/14263388
Can you help me please lol
Answer: Yes
Explanation:
According to Wikipedia the average volume of a human flatulence event is 185ML if the average body temperature is 98.6°F in the atmospheric pressure is 760.0 tour how many moles of gas does the average fart contain
Answer:
0.00726mol
Explanation:
Using general gas equation,
PV = nRT
Where;
P = pressure
V = volume
n = number of moles
R = gas constant (0.0821 L atm mol/K)
T = temperature
First, we need to convert the units of each variable
Volume = 185mL = 0.185L
Pressure = 760.0 torr = 1 atm
Temperature = 98.6°F = 310.15K
PV = nRT
1 × 0.185 = n × 0.0821 × 310.15
0.185 = 25.46n
n = 0.185/25.46
n = 0.00726mol
PLEASE answer these for a brainlist
What are some examples of the flint water crisis? What are adults experiencing in their water and what are the effects on the kids?
What are the safe levels of Lead exposure?
What is the relationship between the blood levels in people and crime rate?
What was the decision made by Flint to save money on water?
What happened in October 2015? How did the water switch affect the people's blood lead levels?
Answer:
avada kadvera
Explanation:
what comes around goes around
Calculate the energy and frequency of red light having a wavelength of 6.55 x 10⁻7m.
Answer:
E = 3.035× 10-¹⁹J = 1.9eV
f = 4.58 × 10¹⁴Hz
Explanation:
wavelength = 6.55 × 10-⁷m
c = 3 × 10⁸m/s
f = ?
E = ?
a) f = c/wavelength
f = 3 × 10⁸/6.55 × 10-⁷
f = 4.58 × 10¹⁴Hz
b) E = hc/wavelength
E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷
E = 3.035 × 10-¹⁹J
1ev = 1.6 × 10-¹⁹J
Therefore E = 3.035/1.6 = 1.9eV
please i need the answer im dying here ;-
What happens when matter changes state? (choose one from the following :))
Its chemical properties change.
Its physical properties change.
The energy of its particles remains the same.
none of the above
Answer:
anawer is none of the above
Answer:
i think none of the above is the answer
A packaging engineer is designing a container to hold hydrogen peroxide. The engineer knows that light speeds up the chemical reaction that
changes hydrogen peroxide into oxygen and water. How might the engineer use
that information when designing the container?
It’s science *
how do the mass and height of an object affect the gravitational potential energy?
A. height has great a greater effect than mass gravitational potential energy
B. mass and height have the same effect on gravitational potential energy.
C. height has almost 10 times the effect on gravitational potential energy then mass has.
D. Mass has a greater effect than height on gravitational potential energy.
Answer:
B. mass and height have the same effect on gravitational potential energy.
Explanation:
Both mass and height have the same effect on the gravitational potential energy of body.
Gravitational potential energy is the energy of a body due to that of another body. It usually the energy at rest in a body.
It is mathematically expressed as;
G.P.E = m x g x h
m is the mass
g is the acceleration due to gravity
h is the height
We see that both the height and mass are directly proportional to the gravitational potential energy and as such, they have the same effect.
(h) Bohr stated that the energy of the electron is quantised. What does this mean?
Explanation:
It suggests that the extranuclear part consists of electrons in specific spherical orbits around the nucleus.
The concept is based on the premise that the electrons move round the nucleus in certain permissible orbits or energy levels. The ground state is the lowest energy state available to the electrons. It is the most stable state. The excited state is any higher energy level than the ground state. An electron in an energy level has a definite amount of energy associated with it at that level. The electron can undergo transitions from one level to another. This way energy of an electron is quantized to each level.65 POINTS AND BRAINLIEST PLEASE HELP ASAP
For this assignment, you will write a research essay, or create a presentation, about a scientist who contributed knowledge to the field of chemistry. Your essay, or presentation, should include the following information about your scientist:
Describe your scientist's contributions and innovations to his or her field.
How did your scientist's research and data influence future use of his or her findings?
Describe the background, interests, or goals that affected your scientist's observations and conclusions.
Once you have selected a scientist, you will need to locate at least three different reliable resources to use to conduct your research. You may use textbooks, the Internet, or library books. These resources should be cited within your presentation and should be listed in a bibliography that you submit with your essay, or slide presentation. Use the Citations, Essay Writing, and Finding Reliable Resources tutorials to guide your writing.
If you have another method by which you would like to present your research findings, please have it approved by your instructor before you begin writing. No matter what presentation style you choose, be sure to use complete sentences and paragraphs, and include all of the necessary research required. You should also review the grading rubric before you begin. Select one of the following scientists, or pick another scientist of interest with your instructor's permission, to conduct your research on: Rosalind Franklin
Answer:
Rosalind Elsie Franklin (25 July 1920 – 16 April 1958)was a British biophysicist and X-ray crystallographer who made critical contributions to the understanding of the fine molecular structures of DNA, RNA, viruses, coal and graphite. The DNA work achieved the most fame because DNA (deoxyribonucleic acid) plays essential roles in cell metabolism and genetics, and the discovery of its structure helped scientists understand how genetic information is passed from parents to children.
rosalindfranklin
Franklin is best known for her work on the X-ray diffraction images of DNA which led to discovery of DNA double helix. Her data, according to Francis Crick, was "the data we actually used" to formulate Crick and Watson's 1953 hypothesis regarding the structure of DNA.Franklin's X-ray diffraction image confirming the helical structure of DNA were shown to Watson without her approval or knowledge. Though this image and her accurate interpretation of the data provided valuable insight into the DNA structure, Franklin's scientific contributions to the discovery of the double helix are often overlooked. Unpublished drafts of her papers (written just as she was arranging to leave King's College London) show that she had independently determined the overall B-form of the DNA helix and the location of the phosphate groups on the outside of the structure. However, her work was published third, in the series of three DNA Nature articles, led by the paper of Watson and Crick which only hinted at her contribution to their hypothesis.
After finishing her portion of the DNA work, Franklin led pioneering work on the tobacco mosaic and polio viruses. She died in 1958 at the age of 37 from complications arising from ovarian cancer.
the oxidation of glucose by enzymes gives
Answer:
Carbondioxide, water and ATP
Explanation:
The reaction is called aerobic respiration because oxygen from the air is needed for it to work.
Which element (Na or Cl) is more likely to steal an outer electron from the other?
Answer:
Cl is more likely to than Na
Explanation:
The question asks for the element more take up an electron from the other
The ability of an atom to take take or give electrons in a chemical reaction, depends on its electron affinity and ionization energy, respectively
Chlorine, Cl, has the highest electron affinity in the periodic table which makes it attract electrons more towards itself
Sodium, Na, has a low ionization energy (about 2/5 of that of chlorine) than chlorine, Cl, making sodium more readily able to give its valence electron in a reaction
Therefore, Cl is more likely to take up an outer electron from Na.
How many moles of Fe are produced from 7 moles of Zn?
Zn(s) + FeSO4(aq) → ZnSO4(aq) + Fe(s)
Answer:
7 mol Fe
General Formulas and Concepts:
Chemistry
StoichiometryExplanation:
Step 1: Define
RxN: Zn (s) + FeSO₄ (aq) → ZnSO₄ (aq) + Fe (s)
Given: 7 moles Zn
Step 2: Stoichiometry
[tex]7 \ mol \ Zn(\frac{1 \ mol \ Fe}{1 \ mol \ Zn} )[/tex] = 7 mol Fe
Step 3: Check
We are given 1 sig fig.
Since our final answer is in 1 sig fig, there is no need to round.
Study the image.
A world map showing the Principal World Air Masses. The four major types of air masses are noted on the map.
Which air mass has formed immediately north of Antarctica in the image?
Answer:
a
Explanation:
A world map showing the Principal World Air Masses. The four major types of air masses are noted on the map. The maritime polar has formed immediately north of Antarctica in the image.
Where is the maritime polar formed?The north Pacific Ocean produces the majority of the maritime polar air masses that affect the United States. However, maritime polar air occasionally forms in the North Atlantic Ocean and moves into the New England states.
In the winter, for example, an arctic air mass can move over the ocean, picking up some warmth and moisture from the warmer ocean and transforming into a maritime polar air mass (mP), which is still fairly cold but contains moisture.
In the image, the maritime polar has formed immediately north of Antarctica. The temperature of mP air varies between just above freezing and below 70 degrees Fahrenheit. As it moves over elevated terrain, mP air changes. Mountain ranges on the windward side
Thus, The maritime polar has formed immediately north of Antarctica in the image.
To learn more about the maritime polar, follow the link;
https://brainly.com/question/7423218
#SPJ6
Which type of weathering has the greatest impact in areas with warm climates and lots of rainfall?
Answer:
In general, hot wet climates accelerate chemical weathering while cold dry climates accelerate physical weathering. Although the rate of weathering depends on the type of rock, rocks in tropical climates experience the highest rates of weathering because of the combination of high heat and heavy rainfall.
How many valence electrons are found in atoms of group 14?
Answer:
4 valence electrons.
Explanation:
How does an atom become charged?
-How does an atom get a positive charge?
-How does an atom get a negative charge?
-Can an atom get a charge with a change of particles in
the nucleus? Explain, please.
Answer:
An atom becomes charged when there is an unequal amount of positive and negative particles in the nucleus.
An atom gets a positive charge when there is an increase in protons or a decrease in electrons, such that there are more protons than electrons in the nucleus.
An atom gets a negative charge when there is an increase in electrons or a decrease in protons, such that there are more electrons than protons in the nucleus.
An atom can get a charge with a change of particles in the nucleus if that change results in an uneven number of protons and electrons.
Explanation:
Because protons are positively charged particles and electrons are negatively charged particles, a neutral atom has an equal amount of protons and electrons, so that the opposite charges of the particles cancel each other out.
However, if there is an unequal amount of protons or electrons in the nucleus, the charge of the particles will no longer be canceled out, and the atom as a whole will take on a positive or negative charge.
While making chicken soup for his family one evening, Luis added the amount of salt the recipe called for. After tasting the soup, he decided the seasoning was correct. He then he let the chicken soup simmer for two hours to blend the flavors. But when he served the soup, it was too salty. What happened to the soup to make it so salty?
A. He added to much solvent
B. He added something else besides salt
C. Some of the chicken was saltier than the rest of it
D. Some water evaporated and concentrated the salt
Answer:
D
Explanation:
Increasing temperature increases the number of collisions and the potential energy of the colliding molecules and
decreases the reaction rate.
True or False PLZ HELP!!
Which is bigger an atom or a cell?
Answer:
Both are small
Explanation:
Atom comprises to die molecules, and cell comprise to for tissues