If you were to measure the mass of magnesium and hydrochloric acid before combining them in the test tube, how would that mass compare to the mass of reactants left in the test tube after the reaction? Explain your answer and how it corresponds to the law of conservation of mass.
Answer:
Answer: The mass of product left in the test tube will be less than the initial measured mass of the reactants.
Explanation: This is because one of the products of the reaction is a gas (hydrogen) and it escapes as the reaction happens in an open system.
This is the reaction,
Mg(s) + 2HCl(aq) --------> MgCl2(aq) + H2(g)
So, evidently, only MgCl2 is left in the reaction test tube together with unreacted reactants.
But, the hydrogen gas that escapes accounts for the lesser mass at the end of the reaction.
The mass in the test tube at the end of the reaction +
the mass of Hydrogen gas that escapes = the mass of reactants before the reaction; consolidating the law of conservation of mass.
Choose all the answers that apply.
The elements in group 18 _____.
are highly reactive
are gases at room temperature
usually do not react with other elements
are in a group called the noble gases
are nonmetals
Answer:
are gases at room temperature
usually do not react with other elements
are in a group called the noble gases
are nonmetals
Explanation:
The elements in group 18 or group O are the inert elements. They have completely outermost shell and are not reactive. Every atom reacts with another in order to be like the noble gases.
All of the elements here are gaseous. They do not readily react with other elements. They are called noble gases, inert gases, or group O elements.It should be noted that group 17 elements are very reactive compared to the group O elements.
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If a 250 ml solution of ethanol in water is prepared with 4 mL of absolute ethanol, what will be the concentration of ethanol in %v/v?
The concentration in volume-volume percent of the solution is: 1.6 %
To solve this problem the formula and the procedure that we have to use is:
% v/v = v(solute)/v(solution) * 100
Where
% v/v = concentration in volume percentv(solute) = volume of solutev(solution)= volume of solutionInformation about the problem:
v(solute)= 4 mlv(solution)= 250 ml% v/v =?Applying the concentration formula we get:
% v/v = v(solute)/v(solution) * 100
% v/v = (4 ml/250 ml) * 100
% v/v = 0.016 *100
% v/v =1.6 %
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
SolventSoluteLearn more about chemical solution at: brainly.com/question/13182946 and brainly.com/question/25326161
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Any element above 92 on the
periodic table has to be constructed
in a lab.
A.False
B.True
answer: it should be false
If 6 grams of a hydrocarbon gas have a volume of
4.8 cubic decimeter, what would be the
approximate molecular mass of this gas?
A 30 grams
B 40 grams
C 20 grams
D 48 grams
Answer:
30 grams
Explanation:
I got 40 wrong so I picked 30
Answer:
30 grams
Explanation:
I did the ck12
......................................
Answer:
Explanation:
yes leon is correct because matter is anything that takes space and also has mass in it.
thks.
ionic bonding occurs when ______ atom donates one or more _______ to a _______ atom
Answer:
ionic bonding occurs when unstable atoms donates one or more valence electrons to a unstable atom
Explanation:
ASAP please and Thankyou
Answer:
c
Explanation:
There are four boxes so each are 25%.
Red = 25%
Red and White = 50%
White = 25%
MULTIPLE CHOICE QUESTION
In an ionic bond, metals will
Gain electrons to form positive ions
Lose electrons to form positive ions
Gain electrons to form negative ions
Lose electrons to from negative ions
Answer:
B) Lose electrons to form positive ions
Explanation:
Conductivity is directly related to the number of ions present in a solution. Insoluble compounds do not dissociate to any appreciable extent. What kind of conductivity would you expect such a solution to have?.
Answer: Referring to a solution that does not completely disassociate, the conductivity would be low.
Explanation: Ions that are completely disassociated conduct better than ions that still are connected by bonds.
The kind of conductivity that would you expect insoluble compounds have is very poor or low. Due to this, these compounds do not dissociate to any appreciable extent.
How is Conductivity measured?Conductivity is measured through the utilization of salinity measurement. This measurement most frequently determines the parts per thousand or grams per liter.
A Siemen is also referred to as its smaller equivalents, the milli-Siemen, and the micro-Siemen, which are each one-millionth of a Siemen, is a unit used to determine the conductivity of any given solution.
Some solutions like NaCl, HCl, NaOH, etc have high electrical conductivity because they readily dissociate into their ions. While insoluble compounds do not have this capability to dissociation, so they generally have low or poor electrical conductivity.
Therefore, insoluble compounds generally have low or poor electrical conductivity.
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Describe the Electromagnetic spectrum. Which waves have most/least energy? List the colors in the visible spectrum from weakest to strongest.
19. A 75-kg piano is hoisted on a crane and delivered through the window of a 6th-story apartment (20
meters above the ground). What is the potential energy of the piano?
20. (ALGEBRA CHALLENGE) The potential energy of a 40-kg cannon ball is 14000 J. How high was the
cannon ball to have this much potential energy?
(19) The potential energy of the piano is 14700 J.
(20) The height of the cannon ball is 35.71 m.
What is potential energy?This can be defined as the energy of a body due to its position in the gravitational field.
(19) To calculate the potential energy of the piano, we use the formula below.
Formula:
P = mgh.............. Equation 1Where:
P = Potential energy of the pianom = mass of the pianoh = Height of the pianog = Acceleration due to gravityFrom the question,
Given:
m = 75 kgh = 20 mg = 9.8 m/s²Substitute these values intyo equation 1
P = 75×20×9.8P = 14700 J(20) To calculate the heigth of the cannon ball we use the formula below.
h = P/mg................... Equation 2From the question,
Given:
P = 14000 Jm = 40 kgg = 9.8 m/s²Substitute these values into equation 2
h = 14000/(40×9.8)h = 35.71 mHence, (19) The potential energy of the piano is 14700 J and (20) The height of the cannon ball is 35.71 m
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Why are yeast cells used in making bread?
Answer:
Yeast is used for the leavening of bread. Yeast uses the sugars and oxygen in dough to produce more yeast cells and carbon dioxide gas. The carbon dioxide makes the dough rise which gives the bread a light and spongy texture. Yeast also works on the gluten network.
Explanation:
Define these three words in your own words. will also give brainliest.
1.air resistance
2.Data
3.Magnetism
Answer:
Translation: Air resistance is a force that is caused by air. The force acts in the opposite direction to an object moving through the air.
Data are characteristics or information, usually numerical, that are collected through observation. In a more technical sense, data are a set of values of qualitative or quantitative variables about one or more persons or objects, while a datum (singular of data) is a single value of a single variable.
a physical phenomenon produced by the motion of electric charge, which results in attractive and repulsive forces between objects.
Juan wanted to investigate how exercise affects heart rate. a classmate sat quietly for 5 minutes before juan used a stopwatch to count her pulse for 15 seconds. a second classmate ran in place for 5 minutes before juan used the stopwatch to find his pulse rate for 15 seconds. after both measurements, juan multiplied the number by 4 to determine hear rate per minute. what did juan do wrong in this investigation? what should juan have done instead?
The wrong Juan did in this investigation is he multiplied by 4 and did not count it for 60 seconds to calculate the heart rate per minute.
What to do to know the pulse rate or heart beat and what did Juan did wrong?See to know the heart beat or pulse rate we simply do it for 60 seconds because we generally obtain the data for a minute .Here Juan is investigating the heart rate for 15 seconds .Plus the the cardinal mistake he did was he multiplied the beats by 4 of both the classmate knowing a student just rushed into the classroom and is exercised.So obviously the student who just arrived the classroom would have high heart rates comparatively.Calculating both heart rates and multiplying with 4 is the main mistake Juan is commiting.To know more about heart rate visit:
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When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type?
Al + Fe3O4→ Al2O3 + Fe
The balanced equation :
8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe
You just have to look for which element is in bold because the question is not clear
Further explanationEqualization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.
2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product
3. Select the coefficient of the substance with the most complex chemical formula equal to 1
Reaction
Al + Fe₃O₄→ Al₂O₃ + Fe
give a coefficient
aAl + Fe₃O₄→ bAl₂O₃ + cFe
O, left=4, right=3b⇒3b=4⇒b=4/3
Al, left=a, right=2b⇒a=2b⇒a=2.4/3⇒a=8/3
Fe, left=3, right=c⇒c=3
The equation becomes :
8/3Al + Fe₃O₄→ 4/3Al₂O₃ + 3Fe x3
8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe
What THREE organisms use photosynthesis?
Answer:
Plants, bacteria, and algae
Explanation: Plants are known to gather food from the sun, algae is a type of plant, and bacteria gather food from the sun while they are in the air.
HELP ASAP 20 POINTS AAAA
Please help. write a paragraph using eight (8) of these terms.
observation
hypothesis
theory
matter
agent
experimental group
control group
temperature
particle
criteria
Answer:
Me and my friends were going to do a science experiment. Jonny’s job was to make the HYPOTHESIS. He said the “ If we mix baking soda and vinegar together, the TEMPERATURE will go down.”
So then Molly mixed the baking soda and vinegar together and checked the TEMPERATURE. We all OBSERVED as the thermometer’s TEMPERATURE went down. “ your THEORY/ HYPOTHESIS was correct!” Exclaimed Molly.
Then the whole science GROUP let out with a cheer! And wrote the information down on their EXPERIMENTAL info chart. They took a microscope and looked at the mixture because they wanted to the the little PARTICLES in the mixture. Lily CONTROLED the microscope she zoomed in and out to see the particles.
Explanation:
i hope this helps:)
In Niel’s Bohr’s model of the atom, electron move like?
Answer:
They move in fixed orbits around the nucleus.
Explanation:
In the Bohr model, it shows the electrons moving in fixed paths around the nucleus, making it easier to see and count them.
Answer:
Pretty sure the electrons orbit.
Explanation:
What does the following nuclear symbol reveal about the particle?
Answer:
Photo?
Explanation:
CHOOSE ONE AND I WILK GIEV YOU BRAINLIEST AND DONT GUESS PLEASE!!!..
Answer:
c
Explanation:
what type of element is [Xe] 4f5
Answer: element symbol: Eu. Element Atomic Number: 63.
Europium
Europium (Eu), chemical element, a rare-earth metal of the lanthanide series of the periodic table.
Hope this helps..... Stay safe and have a great weekend!!! :D
Would neon (ne) normally be expected to form compounds? a. yes, because neon has eight electrons in its outermost level and is unreactive b. no, because neon has eight electrons in its outermost level and is unreactive c. yes, because neon needs six electrons to fill its outermost level d. no, because neon needs six electrons to fill its outermost level
No, neon normally does not form any compounds because neon has eight electrons in its outermost shell and is unreactive.
Neon belongs to the Group 18 of the periodic table.
The other elements(Helium, argon, krypton, radon, xenon) along with neon present in group 18 are known as noble gases.
All the elements of this group are unreactive and gases.
All these gases except Helium have 8 electrons in their outermost level, which is a stable electronic configuration.
As they have a stable electronic configuration, they don’t have any tendency to accept electrons from other elements or donate their electrons, which makes them unreactive.
Thus, neon normally does not form any compounds because neon has eight electrons in its outermost shell and is unreactive.
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An atom has a diameter of 2.00 Å and the nucleus of that atom has a diameter of 9.50×10−5 Å . Determine the fraction of the volume of the atom that is taken up by the nucleus. Assume the atom and the nucleus are a sphere.
fraction of the volume of the atom that is taken up by the nucleus is 1.07x10⁻¹³Å³
Sphere volume is calculated by formula =
V=4/3(πr³) , V is volume , r is radius
Radius = diameter/2
Radius of atom = 2/2=1
Radius of nucleus = (9.50x10⁻⁵)/2 = 4.75x10⁻⁵
now we may calculate the volume for the atom and the nucleus
atom volume = (4/3) × 3.14 × (1 )³ = 4.186 ų
nucleus volume = (4/3) × 3.14 × (4.75× 10⁻⁵)³ = 4.48 × 10⁻¹³Å³
now the fraction of volume of the atom that is taken up by the nucleus:
fraction = nucleus volume / atom volume
fraction =4.48 × 10⁻¹³/4.186 = 1.07x10⁻¹³Å³
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10. Overpopulation occurs when the number of organisms of a species
exceeds the ecosystem's carrying capacity.
True
O False
True.
However, overpopulation also increases if there is a shortage in the population of consumers. As a result population of producers increase.
Answer:
True (statement is correct)
Explanation:
Yeah, overpopulation occurs when the number of organisms of a species exceeds the ecosystem's carrying capacity. Hence, the given statement is correct (true).
In a solid, the particles..
A. Vibrate in place
B. Overcome the strong attraction
C. Slide past one another
D. Move freely
Question 2
1 pts
Because transition metals have more than one stable oxidation state their charges
Answer:
Transition metals can have multiple oxidation states because of their electrons. The transition metals have several electrons with similar energies, so one or all of them can be removed, depending the circumstances. When they attach to other atoms, some of their electrons change energy levels.
Explanation:
HELP ME ASAP PLEASE LOTS OF POINTS
Determine the average atomic mass of Sulfur, given the following:
There are 3 isotopes of the element Sulfur the mass numbers and abundances are as follows:
S-32: 94.99%; S-33: .75%; S-34: 4.26%
Answer: 32.06 atomic mass units
Explanation:
Which of the following symbols would be included in the noble gas notation for an element that had valence electrons in the 5s subshell?
Ar
Kr
Xe
Rn
Answer:
Kr
Explanation:
Just took the test