Answer:
A. Warning
Explanation:
Out of all said choices, the best choice would be warning since it would fit the sentence the most.
"A Warning notifies you that danger is present." compared to:
"A Hazard notifies you that danger is present."
"A Safety notifies you that danger is present."
"A Danger notifies you that danger is present."
Sodium chlorite decomposes into salt and oxygen gas. What is the correct balanced decomposition reaction.
NaClO3 -> NaCl + O2
Answer:
i think it would be c
Explanation:
sorry if it is wrong
Answer:
2NaClO₃ -> 2NaCl + 3O₂
Explanation:
The number of atoms in the reactants has to equal the number of atoms in the products.
Hope that helps.
If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law?
a.the molar amount of the gas
b.the partial pressure of the gas
c.the standard temperature and pressure
d.the molar mass
Answer:
the moral amount of the gas.
What happens to the number of protons in a cation?
Answer:
number of protons is more than the number of electrons.
Explanation:
A cation is a positively charged ion.
An ion is an atom that has lost or gained electron(s). In an ion, the number of protons and electrons are not the same.
Number of protons is the number of positively charged particles
Number of electrons is the number of negatively charged particles.
For a cation, which is positively charged, the number of protons is more than the number of electrons.
Therefore, in cations, we have more protons than electrons.
What is the mass of .89 moles of lithium metal, used in laptop batteries?
The mass of lithium metal that is used in lithium batteries is 6.17 grams, this can be calculated by using number of moles formula.
Number of moles:It is defined as the ratio between mass and molar mass.
It is given by:
Number of moles = mass / Molar mass
What information do we have?
Number of moles= 0.89 moles
Molar mass of Lithium metal= 6.941 g/mol
To find:
Mass of Lithium metal=?
On substituting the values
n= m/M
0.89 = m/ 6.941
m= 0.89*6.941
m= 6.177 grams
Thus, the mass of lithium metal is 6.177 grams.
Find more information about Number of moles here:
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What is the volume of which 0.25 mole of a gas occupied at 0.5 atm and 50°C ?
The volume of the gas : V = 13.243 L
Further explanationGiven
n = 0.25 mole
P = 0.5 atm
T = 50 + 273 = 323 K
Required
The volume
Solution
Ideal gas law
PV=nRT
R = gas constant = 0.082 L.atm/mol K
V = nRT/P
Input the value :
V=0.25 x 0.082 x 323 / 0.5
V = 13.243 L
What type of crust is colliding?
Japan Trench
Eurasian Plate
Pacific Plate
Answer: The Eurasian Plate or both the Eurasian and Pacific Plate.
Explanation:
A certain solid element is better electrical conductor than sulfur, but a poorer electrical conductor than copper. Which of the following elements is most consistent with this information.
a) germanium b) oxygen c) potassium d) mercury e) neon
The average atomic mass for germanium is 72.631 amu. If germanium occurred as a mixture of the two isotopes below, what would be the percent abundance of 73Ge in the mixture?
mass of 70Ge = 69.924 amu
mass of 73Ge = 72.923 amu
Percent abundance of 73Ge in nature = ________ %
Answer:
dora needs help
Explanation:
Answer:
...........................
Mr. Smith wanted to see if the color of light shined on a plant had an effect on the number of leaves it had. He gathered a 2
groups of the same species of plants, gave them the same amount of water, and did the test for the same amount of time.
On one group of plants he used white light. On the second group he changed the light color to red. Identify:
Independent variable:
Dependent variable:
Constants:
Control group (What would Mr. Smith use as a control group?):
Experimental group (what would Mr. Smith use as a experimental group?)
Imagine an alternate universe where the value of the Planck constant is 6.6207 x 10^-36 J*s.
In that universe, which of the following objects would require quantum mechanics to describe, that is, would show both particle and wave properties? Which objects would act like everyday objects, and be adequately described by classical mechanics?
3.A turtle with a mass of 450. g, 29. cm long, moving at 2.7 cm/s.
quantum or classical?
Answer:
See explanation
Explanation:
According to Louis de Broglie, particles could exhibit wavelike properties and have an associated wavelength.
Now for a turtle with a mass of 450. g, 29. cm long, moving at 2.7 cm/s, recall that we can only describe a by quantum mechanics when the body is very small and its associated wavelength is large.
This object has a large mass, hence it is discussed by classical rather than quantum mechanics
Describe briefly how you will determine the relative density of kerosene
Explanation:
First determine the weight of the density bottle(A1) when it's empty.
Then fill it with the liquid you want to determine the density.
Then determine the weight of the bottle with the liquid(A2).
Then the weight of the liquid is equal to (A2 - A1)
You already know the volume of the bottle.
Apply them to density = weight/volume
Make sure to mention the temperature you measured it because density varies from one temperature to another.
number the steps for balancing equations:
O Use coefficients to increase the atoms on each side.
O Check to make sure you have the same number of each type of atom on each side.
O Count the atoms on each side.
O Identify the atoms on each side.
Explanation:
In balancing chemical equations, the law of conservation of matter must be strictly obeyed.
By the virtue of this, the following steps are usually taken:
First identify the atoms on each side of the expression. This to know the number of species to balance. Then count the atoms on each side. Then using appropriate number as the coefficients, increase the atom on each side until there are equal numbers on both sides. Finally, check to make sure we have the same number of each type of atom on each side.Answer:
the answer would be 3 4 2 1
Explanation:
If you were balancing an equation containing the O2 molecule, which of the following would be correct representations of O2 and its coefficient?
a. ½O2
b. O2
c. 3O2
d. 6O2
e. 3O
f. 5O3
Answer:
a. ½O2
b. O2
c. 3O2
d. 6O2
Explanation:
Hello!
In this case, since balancing chemical reactions can be attained by adding coefficients prior to each species in the chemical equation, we infer that the following representations are correct because they have a coefficient and the molecule O2 as diatomic oxygen:
a. ½O2
b. O2
c. 3O2
d. 6O2
It means that e. and f. are wrong because even when they have the coefficient, the molecule O2 is not properly written.
Best regards!
The correct representations of O2 and its coefficient are: ½O2, O2, 3O2, 6O2.
Oxygen molecule O2 exists as a diatomic molecule that comprises two atoms chemically bonded together.
When oxygen undergoes a chemical reaction with other compounds, the diatomicity of oxygen O2 is still usually maintained.
The coefficient of oxygen O2 varies depending on the reaction in which oxygen undergoes such as:
combustion reaction with alkanes,the reaction of iron with oxygen O2, reaction with magnesium etc.An oxygen molecule does not exist as 3O and 5O3 represent a reaction of ozone.
Therefore, we can conclude that the correct representations of O2 and its coefficient are: ½O2, O2, 3O2, 6O2.
Learn more about balancing chemical reactions here:
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A chemist prepares a solution of silver (I) perchlorate (AgCIO4) by measuring out 134.g of silver (I) perchlorate into a 50.ml volumetric flask and filling the flask to the mark with water. calculate the concentration in mol/L of the silver (I) perchlorate soluation
Answer:
13 M
Explanation:
Molar mass of AgCIO4 = 207 g/mol
Number of moles of AgCIO4= 134/207= 0.65 moles
Number of moles= concentration × volume
Concentration = number of moles/volume
Concentration = 0.65 × 1000/50 = 13 M
HELPPPPPPPPPPPPPPPPPP
Answer:
*helps and doesnt get deleted*
Explanation:
Why does a circuit need to connect the negative to the positive sides of a battery?
A 10.0 g sample of water was heated from 20.0°C to 50.0°C. How much energy did the water gain? The specific heat of water is 4.18 J/g·°C.
a.836 J
b.1250 J
c.2920 J
d.4180 J
Answer:
im pretty sure c
Explanation:
6. What is the equilibrium constant for the following reaction?
C+02 = CO2
Given
Reaction
C+02 = CO2
Required
The equilibrium constant
Solution
The equilibrium constant is the ratio of concentration or pressure between the product and the reactant with each reaction coefficient raised
The equilibrium constant is based on the concentration (Kc) in a reaction
pA + qB -----> mC + nD
[tex]\large {\boxed {\bold {Kc ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}}[/tex]
So for the reaction :
C+O₂ ⇔ CO₂
[tex]\tt Kc=\dfrac{[CO_2]}{[C][O_2]}[/tex]
Suppose your metal sample is hammered into the shape of a thin coin with a diameter of 8.62 cm. Determine the thickness (in mm) of this metal sheet. Use the measured metal mass and true denisty of your metal for this calculation.
measured metal mass: 83.956 g
true density: 8.90 g/cm3
Answer:
The thickness of the metal sheet is 0.162 centimeters.
Explanation:
If mass within the coin is uniformly distributed, then the density ([tex]\rho[/tex]), measured in grams per cubic centimeter, can be represented by the following formula:
[tex]\rho = \frac{m}{\frac{\pi}{4}\cdot D^{2}\cdot z }[/tex] (1)
Where:
[tex]m[/tex] - Mass, measured in grams.
[tex]D[/tex] - Diameter, measured in centimeters.
[tex]z[/tex] - Thickness, measured in centimeters.
If we know that [tex]m = 83.956\,g[/tex], [tex]D = 8.62\,cm[/tex] and [tex]\rho = 8.90\,\frac{g}{cm^{3}}[/tex], then the thickness of the coin is:
[tex]z = \frac{m}{\frac{\pi}{4}\cdot D^{2}\cdot \rho }[/tex]
[tex]z = \frac{83.956\,g}{\frac{\pi}{4}\cdot (8.62\,cm)^{2}\cdot \left(8.90\,\frac{g}{cm^{3}} \right) }[/tex]
[tex]z = 0.162\,cm[/tex]
The thickness of the metal sheet is 0.162 centimeters.
Elements on the periodic table are arranged?
Answer:
In atomic number
And size
And nature of each (metal, non, or metalloide)
[tex]\Large \boxed{\sf by \ their \ properties}[/tex]
Every element has a set of particular characteristics. Each has a unique atomic and mass number because they contain a different ratio of protons and neutrons. The number of protons in an element mirrors the element's atomic number. The mass number equals the sum of the element's protons and neutrons.
According to increasing atomic numbers, chemical elements get organized. Periods and groups are the names of the horizontal rows and vertical columns, respectively. The chemical characteristics of elements within the same group are comparable due to their similar valency and number of outer electrons.
6. Three of these terms belong together. Which one doesn't belong?
A) nucleus
B) cytoplasm
C) cell wall
D) cell membrane
Explain why the one you chose doesn't belong with the other three?
Answer:
i am 50/50 at the memoent but i have a feeling it is the cytoplasm as it isnt a cell like the others. Hope this helps :(
Explanation:
what element has greatest atomic radius from group 3?
Answer:
i think iron
Explanation:
i not sure with my ans
Magnesium and Copper Sulfate react to form Magnesium Sulfate and Copper in the following equation.
Mg + CuSO4 -> MgSO4 + Cu
Answer:
B: Single Displacement Reaction
Explanation:
A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.
A + BX -> B + AX
For example:
Cation Replacement
Zn + CuCl2 -> ZnCl2 + Cu
Anion Replacement
Br2 + 2Ki -> 2KBr + I2
You just switch either the cation with another anion or switch an anion with another cation.
Hope it helped!
any two substances which are odourless
Answer:
This question perplexes me somewhat. If we as humans are not able to detect a scent or odor from certain substances, that does not of necessity mean those substances are not giving off an odor, and are therefore not “truly” odorless, just odorless to the less sensitive noses of humans.
Water is supposedly odorless, but I know quite well of a test where subjects did a blind tasting, only instead of wine these people were tasting Australian waters, sourced from different locations around the country.
All of these tasters (professionals) were able to differentiate the waters and from what I recall, were all accurate. These wine buffs use their palates as well as their taste-buds, so, were there no odor, their task would have had a greater degree of difficulty.
My own baby sister has such a sensitive palate that she can tell you if you serve her a glass of water from the fridge whether that water was fresh, straight from the tap (unfiltered), filtered or had been boiled before and whether it had been boiled for more than five minutes or not. Truly.
So I would find it difficult to answer your question, “What substances are truly odorless?” , because I am not sure of the criteria you mean by “truly” odorless. In other words, If you are talking about zero degrees, are you talking of the freezing point of water, absolute zero or zero degrees Kelvin?
I’m sure there are substances that are odorless, to humans, but are those same substances “truly” odorless, or only to our perception of them?
Hope this helps, have a wonderful day/night, and stay safe!
PLEASE HELP WHICH ONE IS IT AND CAN YOU EXPLAN HOW YOU GOT THE ANSWERS TY!!!
In a titration, a 20 mL sample of NaOH(aq) was neutralized by 14.9 mL of 0.13 mol/L
H2SO4(aq). The concentration of the base is
A)8.7 mol/L
B)10.048 mol/L
C)0.19 mol/L
D)0.35 mol/L
/L
Answer:
C)0.19 mol/L .
Explanation:
Hello!
In this case, since the chemical reaction between sodium hydroxide and sulfuric acid is:
[tex]H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O[/tex]
Whereas a 1:2 mole ratio is seen between the acid and the base, we can write:
[tex]2*M_{acid}V_{acid}=M_{base}V_{base}[/tex]
In such a way, we solve for the concentration of base and plug in to obtain:
[tex]M_{base}=\frac{2*M_{acid}V_{acid}}{V_{base}} \\\\M_{base}=\frac{2*0.13mol/L*14.9mL}{20mL} \\\\M_{base}=0.19mol/L[/tex]
Thus, the answer is C)0.19 mol/L
Best regards!
2 NaOH (s) + CO2(g) → Na2CO3 (s) + H20 (I) How many grams of water can be produced with 1.85 moles of NaOH
Explanation:
Mole ratio of NaOH to H2O = 2 : 1
Moles of H2O = 1.85mol * (1/2) = 0.925mol.
Mass of H2O = 0.925mol * (18g/mol) = 16.65g.
Answer:
16.65 grams of water can be produced with 1.85 moles of NaOH.
Explanation:
Mole ratio of NaOH to H2O = 2 : 1
Number of moles of water = (1/2)×1.85= 0.925 moles
Molar mass of water (H2O) = 18g/mol
Mass of the right water = 18g/mol×0.925 mol=16.65 grams
In order to heat a round bottom flask in a heating mantle, plug the heating mantle into _______.Turn the heat up _________, and do not exceed _______ of the maximum output of the device.
Answer:
A Variac or Powermite; gradually; 50-60%.
Explanation:
A chemical reaction can be defined as a chemical process which typically involves the transformation or rearrangement of the atomic, ionic or molecular structure of an element through the breakdown and formation of chemical bonds to produce a new compound or substance.
Some of the laboratory apparatus (equipment) used for conducting a chemical reaction are conical flask, Bunsen burner, beaker, tongs, crucible, round bottom flask etc.
In order to heat a round bottom flask in a heating mantle, plug the heating mantle into a Variac or Powermite which is typically used for controlling the level of temperature. Turn the heat up gradually, and do not exceed 50-60% of the maximum output of the device, so as to avoid any electrical issues such as overloading, short-circuit etc.
The safety precautions that must be taken when using a round bottom flask are;
I. A proper inspection of the round bottom flask for cracks, irregularities or any imperfection.
II. Ensure you avoid heating the flask while it is closed.
III. When suspending the round bottom flask on a stand, you should ensure that you use a clamp for stability.
.What type of energy includes both kinetic and potential energy?
Answer:
mechanical energy
Explanation:
Assuming a 25% efficiency, how many Calories would a horse need to consume to work at 1.0 hp for 2.0 hh ?
Answer:
E = 7.11 × [tex]10^{-7}[/tex] Cal
Explanation:
given data
efficiency = 25 %
solution
first we get here E by the power that is express as
p = [tex]\frac{E}{t}[/tex] ...........1
E = p × t
E = 1 × 2 × [tex]\frac{1hp}{746w} \times \frac{1hr}{3600 s}[/tex]
E = 7.447 × [tex]10^{-7}[/tex] J
and
Ein is get by efficiency
Ein = [tex]\frac{Eout}{\eta }[/tex] ..................2
Ein = [tex]\frac{7.447 \times 10^{-7}}{.25 }[/tex]
Ein = 29.788 × [tex]10^{-7}[/tex] J
so required energy is
E = 29.788 × [tex]10^{-7}[/tex] × [tex]\frac{1Cal}{4.184J}[/tex]
E = 7.11 × [tex]10^{-7}[/tex] Cal
A(n)_________contains only one type of atom, whereas a(n)_________ is composed of two or more different elements bonded together. A(n)___________ also contains more than one substance, but these can be separated by physical means, whereas the components of a compound cannot.
Answer:
1. Element
2. Compound
3. Mixture
Explanation:
Elements and compounds are both pure substances. ELEMENTS are substances that contain only one type of atom. For example, Cl2 contains only chlorine atoms. COMPOUNDS, on the other hand, contain atoms of two or more elements that are chemically joined together. For example, CaCl2 contains atoms of calcium and chlorine.
MIXTURES are another kind of substances that contains more than one substances, however, unlike compounds, they are not chemically joined. Mixtures can easily be separated by physical means.