Answer:
D
Explanation:
A new substance must form in a chemical change. structure, properties and composition must change in a chemical change.
The creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.
What is reaction?Reaction is defined as a process in which one or more substances are also called as reactant, are convert to one or more different substance known as product.
There are basically five types of reaction
Combustion reactionDecomposition reactionNeutralization reactionPrecipitation reactionSynthesis reactionA new reaction must have chemical change as well as physical change such as structure, properties and composition.
Thus, the creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.
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How to know what gases have more effusion?
Answer:
If you have ever been in a room when a piping hot pizza was delivered, you have been made aware of the fact that gaseous molecules can quickly spread throughout a room, as evidenced by the pleasant aroma that soon reaches your nose. Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target.
Explanation:
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-What number is 66.3% of 56?
-Find a number so that 25.5% of it is 10.
Answer:
17
39.21
Explanation:
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54578 meters per second into miles per hour
Answer:
54578 mps - 122087.51 mph
Explanation:
Victoria grows the same bacteria in 20 petri dishes. She places 10 of the dishes in a container with a normal atmosphere. The remaining dishes she places in a container in which the oxygen level is double the normal level. She labels the first group "A" and the second group "B." Which statement best describes the groups?
Answer:
There are no options but the question can be answered based on general understanding of experimentation.
Group A: Control group
Group B: Experimental group
Explanation:
In an experiment, there are two groups viz: the control group and the experimental group. A control group is the group that does not receive any experimental treatment. It is considered the normal group while the experimental group is the group that is subjected to experimental treatment.
N.B: The experimental treatment in this case is the "Oxygen level"
According to the question, out of 20 petri-dishes used to grow bacteria, half (10) of the petri-dishes were placed in a container with normal atmosphere while the other 10 petri-dishes were placed in another container that have double the normal oxygen level. The first group of bacteria labelled GROUP A are the CONTROL GROUP because they were not given any treatment i.e placed under normal conditions while GROUP B are the EXPERIMENTAL GROUP because they are the group that received the experimental treatment (increased oxygen level).
BiP is found in high concentration in the lumen of the ER but is not present in significant concentrations elsewhere in the cell. How do you think this condition is established and maintained
Answer:
Initially, endoplasmic reticulum plays a key role in the production of protein, while BiP found in the endoplasmic reticulum contains Lysine , Aspartic acid , Glutamic acid and Leucine sequence. All these, cause BiP concentration to remain high in the ER (endoplasmic reticulum) hence retained. Making the lumen always concentrated on BiP.
Explanation:
BiP is known as binding protein, that binds two or more molecules together and is found in the endoplasmic reticulum at the lumen due to the absence of glucose.
The endoplasmic reticulum found in fungi cells, plant cells, animal cells, and protists cells, makes and processes proteins.
Lysine , Aspartic acid , Glutamic acid and Leucine sequence ensures the protein concentration is protected in the endoplasmic reticulum (ER).
The figure shows four forces exerted on a box.
Box
If F, equals 4 N and F3 equals 6 N and the box remains stationary, which statement is correct?
a
F2 equals 6 N and F4 equals 4 N.
b
F2 equals 2 N and F4 equals 10 N.
F2 equals 10 N and F4 equals 2 N.
Od
F2 equals 4 N and F4 equals 6 N.
which would be isotopes?
Answer:
e
Explanation:
. Un cuerpo irregular se introduce dentro de una probeta que inicialmente tiene un volumen de 20 ml como muestra la figura Después de la experiencia podemos afirmar que * El volumen del cuerpo es 3 ml. El volumen del cuerpo es cero. El volumen del cuerpo es igual al iniciar la experiencia. El volumen del cuerpo es 24 ml.
Answer:
El volumen del cuerpo es el mismo al comienzo de la experiencia.
Explicación:
El volumen del cuerpo es el mismo al principio porque el volumen no cambia si la temperatura permanece igual. Si cambiamos la temperatura i. mi. Al aumentar la temperatura, las moléculas comienzan a expandirse y se produce un aumento de volumen mientras que cuando disminuimos la temperatura, las moléculas de esa sustancia comienzan a contraerse y el volumen de esa sustancia disminuye. Entonces concluimos que el volumen depende de la temperatura.
Write 1 characteristic of Science
Answer:
Accuracy
Explanation:
For example a physician checking a person temperature who not say he is cold or hot but will give u an accurate answer after using a thermometer
"What quantitative measurement and qualitative observations can be made about the interactions of matter and energy?" can someone break this down for me?
Quantitative measurements are numerical values, they involve amounts and units like measuring things. Qualitative observations appeal to the five senses, like what does the interaction look and sound like
Quantitative measurement about the interactions of matter and energy significantly deals with the representation of numerical values and data.
What is Matter?Matter may be defined as any sort of substance that is constructed of numerous types of particles that occupy physical space and possess inertia. In simple words, matter may be characterized as anything which occupies space and has mass.
The Qualitative observation of the interactions of matter and energy prominently deals with the concept based on perception. It basically involves all sorts of senses that one should occupy.
For example, how does the interaction between matter and energy looks like in appearances, heared through sounds, and feels through external factors.
Therefore, quantitative measurement and qualitative observations can significantly be made about the interactions of matter and energy.
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The difference between an element and a compound is that:
a compound only contains one type of atom
one is chemically combined and one is only physically combined
ΟΟΟΟ
a compound is just a different name for an element
an element only contains one type of atom
Answer:the element contain only one type of atomic while the cpd contain more than two types of atoms
Explanation:
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The specific heat of aluminum is 0.900 J/gºC. How much energy is needed to raise the temperature of a 20.0 g block of aluminum from 22.8°C to 94.6°C?
✅Show work regardless if student got answer correct or incorrect
q = mC∆T
q = (30.0g)(0.900J/goC)(50oC)
q = 1350 J
So, the right answer is 1350 J
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The "Atomic Number" is another way to refer to: a the number of atomic mass units b the number of neutrons c the number of electrons d the number of protons
Answer:
D. The number of protons.
In titrating 0.20 M hydrochloric acid, HCl, with 0.20 M NaOH at 25°C, the solution at the equivalence point is
Answer:
c) 0.10M NaCl
Explanation:
Options are:
a) 0.20M NaCl
b) Very acidic
c) 0.10M NaCl
d) 0.10M HCl + 0.20M NaOH
e) Slightly acidic.
Based on the reaction:
NaOH + HCl → H₂O + NaCl
You can see than 1 mole of NaOH reacts per mole of HCl producing 1 mole of NaCl
Assuming 1L of 0.20M HCl reacts with 1L of NaOH, moles of both compounds are:
1L * 0.20mol/L = 0.20 moles reacts. That means moles of NaCl produced are 0.20moles in 2L. Molarity of NaCl is:
0.20mol / 2L = 0.10M NaCl
That means, right option is:
c) 0.10M NaClAt the equivalence point, 0.01 M NaCl is present.
The reaction between NaOH and HCl occurs as follows;
NaOH(aq) + HCl(aq) ------> NaCl(aq) + H2O(l)
Concentration of HCl = 0.20 M
Concentration of NaOH = 0.20 M
Let as assume that the volume of both solutions is 1 L each
Number of moles of HCl = 0.20 moles
Number of moles of NaOH = 0.20 moles
The reaction is 1:1 hence 0.20 moles of NaCl is formed. However, the volume of the solution is now 2L.
Concentration of NaCl = 0.20 moles/2L = 0.01 M
Missing parts;
In titrating 0.20 M hydrochloric acid, HCl, with 0.20 M NaOH at 25°C, the solution at the equivalence point is
Select one:
a. 0.20 M NaCl
b. very acidic
c. slightly acidic
d. 0.10 M HCl and 0.20 M NaOH
e. 0.10 M NaCl
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A pure sample of a hydrocarbon is found to be 74.5% carbon by mass. What is the empirical formula of this compound?
Answer:
THE EMPIRICAL FORMULA FOR THE PURE HYDROCARBON IS CH4
Explanation:
A pure hydrocarbon contains carbon and hydrogen
Percentage composition of carbon = 74.5 %
Percentage composition of hydrogen = 25.5
In order to calculate the empirical formula of this hydrocarbon, you follow these couple of steps.
write out the percentage composition and divide by the relative atomic mass of the respective constituents.
Carbon = 74.5 / 12 = 6.2083
Hydrogen = 25.5 / 1 = 25.5
Next is to divide the values by the lowest factor
Carbon = 6.2083 / 6.2083 = 1
Hydrogen = 25.5 / 6.2083 = 4.1
Next is to write the empirical formula:
C H4
In conclusion the empirical formula for the pure hydrcarbon is CH4
Which tool gives scientists information about the wind speed and humidity of a region?
Answer:
A weather station
Explanation:
A weather station measures the wind speed and humidity of a specific area. GIS gives visual data that scientists can analyze, GPS gives the exact location of a weather phenomenon, and a hammer and lens allow scientists to study Earth’s geologic features.
What is in the space between electrons?
Answer:
The empty space between the atomic cloud of an atom and its nucleus is just that: empty space, or vacuum. ... Electrons are thus 'spread out' quite a bit in their orbits about the nucleus. In fact, the wave-functions for electrons in s-orbitals about a nucleus actually extend all the way down into the nucleus itself.
Chemistry questions below! (●'◡'●)
(1) • Balanced Equation : 2HgO (s) ---> 2 Hg (l) + O₂ (g)
• Line a is represented by activation energy, or the smallest amount of energy needed for molecules to undergo a chemical reaction.
• Activated complex is the intermediate state during the conversion of reactants into products. In this case it is represented by Hg----O-----O----Hg. The dashed lines indicate that the bond between Hg and O are breaking and their length is increasing and the dashed line between oxygen atoms indicate that the bond is decreasing and bond formation is taking place.
• This reaction is endothermic as the energy of reactants is smaller than the energy of products.
(2) • Balanced Equation : CH₃Br + OH⁻ ---> CH₃OH + Br⁻
• The hydroxide ion reacts with the bromomethane, resulting in a double replacement reaction. The 'CH₃' in 'CH₃Br' joins with the hydroxide ion to form CH₃OH, while the Br breaks off as an ion.
• Take a look at the energy diagram below.
Express 0.107 g to centigrams.
Answer:
10.7
Explanation:
1 gram is equal to 100 centigrams
so, multiply
If you want to cause an object to move, what should you do?
Answer:
For an object to move, there must be a force. A force is a push or pull that causes an object to move, change direction, change speed, or stop. Without a force, an object that is moving will continue to move and an object at rest will remain at rest.
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20 POINTS As a part of a laboratory investigation, Emily measured the volume of water in a graduated cylinder. Which of the choices correctly identifies the volume of water in the graduated cylinder? A. 38 mL B. 35 mL C. 37 mL D. 36.5 mL
Answer:
A.
Explanation:
Answer:
Actually both of ya are incorrect, it would be D. 36.5 mL, on study island it says that.
Explanation:
any observation must be measurable as well as...
What happens to the muscle of dmd while working out
Which of the following is an example of using creativity while recording measurements during an experiment? (5 points) a Writing a hypothesis b Organizing data in tables c Validating results by repetition d Interpreting results based on data
Answer:A
Explanation:
Which describes any compound that has at least one element from group 17?
halide
noble gas
metalloid
transition metal
Answer:
A) Halide
Explanation: I promise, I made a 100 :)
Answer:
Halid!
Explanation:
i took the test
Describe all of the forces acting on the ice cream in the root beet float. Relate these forces to the fact that the ice cream is floating.
Answer:
he root beer exerts a force on all sides of the ice cream. These forces are all equal and cancel each other out. Gravity pushes downward on the ice cream. ... The ice cream floats because the buoyant force is greater than the weight of the ice cream.
Explanation:
Answer:
he root beer exerts a force on all sides of the ice cream. These forces are all equal and cancel each other out. Gravity pushes downward on the ice cream. ... The ice cream floats because the buoyant force is greater than the weight of the ice cream.
Explanation:
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100 POINTS A graph of gas pressure versus the number of particles in a container is a straight line. Which other relationship will have a similar graph? volume versus pressure, because they are also directly proportional volume versus temperature, because they are also directly proportional volume versus pressure, because they are also inversely proportional volume versus temperature, because they are also inversely proportional
Answer:
volume versus temperature, because they are also directly proportional
Explanation:
you can trust me
Answer:
volume versus temperature, because they are also directly proportional
Explanation:
the guy below me was correct
write this in standard form
Answer:
yes sir GLSBYWPOS
Explanation:
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Question 2 of 5
What is the frequency of a wave that passes a given point 57 times in 3.0
seconds?
O A. 0.053 s
B. 19 Hz
C. 171 Hz
O D. 60 s
SUBMIT
Answer:
Frequency=?,number of oscillation=57,time=3.
There are two ways to go about this....
You can other use this formula: frequency=number of oscillation/time.
which is 57/3=19Hz.
OR.
You can use this formula:Period is time/number of oscillation.. which is..
3/57=0.053.
and frequency is 1/T....The "T" stands for period.
So since frequency is 1/T then it will be 1/0.053=18.8~19Hz..
The answer is option B.
Thank you for the question I hope it helps you
How is the periodic table organized?
Answer:
The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
Explanation:
The periodic table is arranged in order of increasing atomic numbers of elements.
The periodic table is arranged in groups and periods. The elements in the same group have the same number of valence or outermost electrons while the elements in the same period have the same highest energy level.
According to the modern periodic law, the properties of elements are periodic function of their atomic numbers. Hence, the elements are found arranged in order of increasing atomic numbers from left to right in the periodic table.
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