Answer:
soilds - close together arranged in a regular way
liquids - close together arranged in a random way
gases - far apart arranged in a random way
Explanation:
is mercury homogeneous or heterogeneous?
Answer:
homogenous
Explanation:
its a pure element, so it is a pure substance
Please answer 39 and beyond
Which equation best represents the conservation of matter?
If the reaction occurs between Fe2S3(s) and H(aq) and the equation is properly balanced with the
smallest whole-number coefficients, what is the sum of the coefficients for all reactants and products?
Fe2S3(s) + H+ (aq)
Please answer this mathematically.
In the reaction between Fe₂S₃(s) and HBr(aq), the sum of the coefficients for all reactants and products is 12.
If the reaction occurs between Fe₂S₃(s) and HBr(aq) and the equation is properly balanced with the smallest whole-number coefficients, what is the sum of the coefficients for all reactants and products?
Let's consider the unbalanced equation for the reaction between Fe₂S₃(s) and HBr(aq). This is a double displacement reaction.
Fe₂S₃(s) + HBr(aq) ⇒ FeBr₃(aq) + H₂S(g)
We will balance it using the trial and error method.
First, we will balance Fe atoms by multiplying FeBr₃ by 2.
Fe₂S₃(s) + HBr(aq) ⇒ 2 FeBr₃(aq) + H₂S(g)
Then, we will balance S atoms by multiplying H₂S by 3.
Fe₂S₃(s) + HBr(aq) ⇒ 2 FeBr₃(aq) + 3 H₂S(g)
Finally, we will get the balanced equation by multiplying HBr by 6.
Fe₂S₃(s) + 6 HBr(aq) ⇒ 2 FeBr₃(aq) + 3 H₂S(g)
The sum of the coefficients for all reactants and products is:
[tex]1 + 6 + 2 +3 = 12[/tex]
In the reaction between Fe₂S₃(s) and HBr(aq), the sum of the coefficients for all reactants and products is 12.
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Which is a strong base?
A. HCl
B. NaOH
C. NH3
D. H3CO3
Answer:
c
Explanation:
Answer:
B
Explanation:
Which are examples of a phase change? (Select all that apply.)
melting chocolate
frying bacon
baking bread
freezing water
Answer:
It is melting chocolate and freezing water.
Explanation:
If your melting melting chocolate it would turn into a liquid and if you freeze
water then you are turning liquid to a solid.
Melting chocolate and freezing water are the examples of phase change.
What do you mean by phase change?A phase change is a change in the states of matter. For example, a solid may become a liquid. This phase change is called melting. When a solid changes into a gas, it is called sublimation.
A phase transition is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas.
There are eight thermal processes through which matter can attain phase change. They are melting, freezing, evaporation, condensation, sublimation, deposition, ionization, and recombination.
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How many significant figures are in the following number? 3,000.0 x 10⁴ grams
Answer:
5 significant figures.
Explanation:
The decimal place makes the zeros significant.
Calculate the mass percent of H in C3H8O3.
%
Answer:
because of it being that you have inferno dragon plsss
A student wants to know why sandhill crane‘s fly south for the winter. The student uses a map of North America to make a model of the paths sandhill cranes take as they migrate. The student draws lines with arrows to show the routes sandhill cranes are known to take. Which two issues describe limitations of the students models?
Two limitations of the student's models are that the models do not explain why the phenomenon occurs and the models only record the phenomenon in a limited way
Understanding a specific phenomenon requires gathering and analyzing data thoroughly because the researcher needs to collect data that is directly related to the phenomenon and this data needs to be complete and accurate to have reliable conclusions.
In this situation, the student created some models of the routes of the sandhill crane's migration. This data has two main limitations:
It does not answer the question "why?": If the student wants to understand why these birds go to the South, the models are not very useful because they show "how" these birds migrate but not the reason for this migration.It records the migration only in a limited way: For the models to be complete the student needs to record the migration pattern for two years or more, as the pattern might changeBased on this, two limitations of the models are that they do not explain the phenomenon and the data is not complete.
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taylor drinks 2 liters of water during every concert how many milliliters did she drink during two concerts
Answer:
Taylor drinks 4 liters of water
Explanation:
2 litters of water per concert
2 concerts is 2x2=4
Chemical contamination is more likely to
occur under which of the following
situations?
When cleaning products are not stored properly
When dishes are sanitized with a chlorine
solution
When raw poultry is stored above a ready-to-eat
food
When vegetables are prepared on a cutting
board that has not been sanitized
Chemical contamination is likely to occur when cleaning products are not stored properly.
Chemical contamination refers to the introduction of harmful chemicals into food, water or the environment. These chemical substances may come in contact with food and water in many ways.
The most common sources of chemical contamination are chemical substances that are not properly stored.
Hence, chemical contamination is likely to occur when cleaning products are not stored properly.
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What mass of H2O is produced by the combustion of 1.00 mol of CH4?
CH4(g) + 202(g) → CO2(g) + 2H2O(e)
The mass of H2O is produced by the combustion of 1.00 mol of CH4 is 36.0 grams.
What do you mean by molar mass ?The term molar mass is defined as the mass of 1 mole of that particular substance and number of grams per mole of a compound.
The balance chemical equation is as follows:
CH4(g) + 202(g) → CO2(g) + 2H2O(e)
The mass of H2O = 36.0 g
Calculating the mass of H2O produced
mass of H2O = 1.00 mol CH4 × (2 mol H2O / 1 mol CH4) × (18.015 g H2O / 1 mol H2O)
mass H2O = 36.0 grams
Thus, The mass of H2O is produced by the combustion of 1.00 mol of CH4 is 36.0 grams.
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how toxic is uranium
Answer:
Inhaling large concentrations of uranium can cause lung cancer from the exposure to alpha particles. Uranium is also a toxic chemical, meaning that ingestion of uranium can cause kidney damage from its chemical properties much sooner than its radioactive properties would cause cancers of the bone or liver.
Explanation:
How many grams of O2 are present in 44.1 L of O2 at STP?
a.10.0 g
b.16.0 g
c.32.0 g
d.410.0 g
e. 63.0 g
Taking into accoun the STP conditions and the ideal gas law, the correct answer is option e. 63 grams of O₂ are present in 44.1 L of O2 at STP.
First of all, the STP conditions refer to the standard temperature and pressure, where the values used are: pressure at 1 atmosphere and temperature at 0°C. These values are reference values for gases.
On the other side, the pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where:
P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances.n is the number of moles of the gas.Then, in this case:
P= 1 atmV= 44.1 Ln= ?R= 0.082 [tex]\frac{atmL}{molK}[/tex]T= 0°C =273 KReplacing in the expression for the ideal gas law:
1 atm× 44.1 L= n× 0.082 [tex]\frac{atmL}{molK}[/tex]× 273 K
Solving:
[tex]n=\frac{1 atm x44.1 L}{0.082\frac{atmL}{molK}x273K}[/tex]
n=1.97 moles
Being the molar mass of O₂, that is, the mass of one mole of the compound, 32 g/mole, the amount of mass that 1.97 moles contains can be calculated as:
[tex]1.97 molesx\frac{32 g}{1 mole}[/tex]= 63.04 g ≈ 63 g
Finally, the correct answer is option e. 63 grams of O₂ are present in 44.1 L of O2 at STP.
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https://brainly.com/question/4147359?referrer=searchResultsWhy should A chemical equation be balanced?
A. To show that the reactants are compounds
B. To show metals from nonmetals
C. To show ionic compounds
D. To show the law of conservation of mass
Please answer. No links please!!!
I am giving the brainliest answer too
Explain… What are the subatomic particles of an atom, and where are they located in the atom? Be specific.
Atomic Particles
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
I hope its helpwhy are noble gases considered the most stable elements
Answer:
they have the maximum number of valence electrons their outer shell can hold.
Explanation:
We mix 88 grams of oxygen gas with 33 grams
of argon gas in a volume of 2400 mL at 62◦C.
What will be the final pressure of the gas
mixture?
The final pressure of the gas mixtures is 72.48 atm.
The given parameters;
mass of the oxygen = 88 gramsmass of the argon, = 33 gramsvolume of the gaseous mixture, V = 2400 mL = 2.4 LThe number of moles of the gases is calculated as follows;
[tex]number \ of \ moles \ of \ oxygen = \frac{88}{16} = 5.5 \ moles\\[/tex]
[tex]number \ of \ moles \ of \ argon = \frac{33}{40} = 0.825 \ moles\\[/tex]
The total number of moles of the gas mixture;
= 5.5 + 0.825
= 6.325 moles
The final pressure of the mixture is calculated as follows;
PV = nRT
[tex]P = \frac{nRT}{V} \\\\P = \frac{6.325\ mol \times (0.0821 \ L.atm/mo.K) \times (62+273)}{2.4 \ L} \\\\P = 72.48 \ atm[/tex]
Thus, the final pressure of the gas mixtures is 72.48 atm.
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2.
Which form of cell division produces four cells with chromosomes different from the
parent cell?
B
budding
dominant
meiosis
Dmitosis
Answer:
meiosis
Explanation:
The substance that is dissolved in another substance to create
a solution is called the
Answer:
The substance that is dissolved in another substance to create a solution is a Solute. A Solute is a minor component in a solution which is a substance that is being dissolved, while the solvent is the dissolving medium. Solutions can be formed with many different types and forms of solutes and solvents.
how do i convert 9.5125 liters to gallons
Answer:
That would be 2.51293615
Explanation:
1 liter is equal to 0.264172 gallons.
What you would need to do is, multiply the total number of liters, which in this case is 9.5125, by 0.264172.
9.5125 x 0.264172 gets you 2.51293665.
I hope this helps! :)
Write a balanced chemical equation for the standard formation reaction of solid calcium oxide (CaO).
Answer:
2Ca +O2 ----------> 2CaO ( Balanced Reaction)
The balanced chemical equation for the standard formation reaction of solid calcium oxide (CaO) is
Ca + O2 --> CaO2
Heya are balanced equations?A balanced chemical equation is an equation in which the the number of atoms of each elements on both the reactant and products sides are equal.
Calcium oxide is an alkaline which is solid at room temperature and is formed by the reaction of one atom of calcium and two atoms of oxygen.
Therefore, the balanced equation of formation reaction of solid calcium oxide (CaO) is Ca + O2 --> CaO2.
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Helpppp meeeee!!! I beg you
Answer:
True
Explanation:
The flame from the candle gives off back smoke. Is this sign of a physical change or a chemical change?
Answer:
Both physical and chemical changes
Look at the graph above showing the composition of air. Which component is the solvent?
The component that would be the solvent from the graph would be nitrogen.
From the graph, nitrogen takes up 78%, oxygen had 21%, while the remaining gases take the remaining 1%.
A solvent is a substance or the component of a solution that has the capacity to dissolve other substances
In a mixture consisting of 2 or more substances, the substance with the highest volume usually acts as the solvent.
In this case, nitrogen holds the highest volume of all the gases in the graph. Thus, it can be considered as the solvent while the remaining gases are the solutes.
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How many grams of NaBr must he measure out to have 4.20 moles?
Answer: 432 grams
Explanation:NaBr must he measure out to have 4.20 moles.
1. Rank each of the following in order of INCREASING atomic radius
a F, K, Br
b. Mg. Na, Cs
c. Os, Ni, Fe
2. Rank each of the following in order of DECREASING atomic radius
A. CI, Br, Ga
B. Ne, Rn, Pb
C. Ca, Rb, C
12) SEP Use Mathematics Complete the table by identifying the atomic number and
mass number for each atom and then using those data to determine the numbers
of protons, neutrons, and electrons.
Composition of Atoms
Atom
Atomic number
Mass number
Protons
Electrons
Neutrons
Na
2s
silver-108
47
T
gold-197
79
O
+ Back
Next →
INTL
The given elements are Na, Ag and Au.
1. Sodium(Na)
Mass number= 23 u
Atomic number=11
Number of protons= Number of electrons= Atomic number=11
Number of neutrons= Mass number- Number of protons=23-11=12
2. Silver (Ag)
Mass number= 108 u
Atomic number= 47
Number of protons= Number of electrons= Atomic number= 47
Number of neutrons= Mass number- Number of protons=108-47=61
3. Gold (Au)
Mass number= 197 u
Atomic number= 79
Number of protons= Number of electrons= Atomic number= 79
Number of neutrons= Mass number- Number of protons= 197-79=118
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An unknown mass of each of the following substances, initially at 23.0 ∘C , absorbs 1940 J of heat. The final temperature is recorded as indicated. Find the mass of each substance. Pyrex glass (final temp:55.4 C)
The mass of the Pyrex glass that absorbs 1940J of energy is 79.52grams.
How to calculate mass?The mass in a calorimetry procedure can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity = 0.753Jg/°C∆T = change in temperatureAccording to this question, an unknown mass of each of the following substances, initially at 23.0∘C , absorbs 1940 J of heat. The final temperature is recorded as indicated. The mass can be calculated as follows:
1940 = m × 0.753 × (55.4°C - 23.0°C)
1940 = 24.39m
m = 79.52grams.
Therefore, 79.52grams is the mass of the pyrex glass.
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