Answer:
from
H=mc∆T
where by;
H is amount of heat.
m is mass of water.
c is specific heat of water.
∆T is change in temperature.
m=density ×volume
m=1.00g/ml×45.7ml
m=45.7g
∆T=Tt-T°
∆T=41.3°C-23.6°C
∆T=17.7°C
H=45.7g×4.184j(g•°C)×17.7°C
H=3,384.396J
H=3,384.396÷1000
H=3.384kJ
Explanation:
H=mc∆T
where by;
H is amount of heat.
m is mass of water.
c is specific heat of water.
∆T is change in temperature
90Sr →?+e
38
Express your answer as a nuclear equation
Strontium ( Atomic Number 38 ) undergoes beta minus decay. Atomic mass of Strontium is 90 u. The given reaction shows the complete nuclear reaction of Strontium.
⁹⁰₃₈ Sr → ⁹⁰₃₇ Y + ⁰₋₁ β + ⁻∨ₑ
Beta particle β is a high speed electron. Whenever Strontium undergoes beta minus decay, the neutron located inside its nucleus gets converted into proton. During the same reaction, a beta particle and electron antineutrino are also being released or emitted.
In the nuclear reaction ( Beta minus decay ) of Strontium, mass and charge are conserved.
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how much work is done in lifting a 2kg objext to a height of 1m
Answer:
19.6 J
Explanation:
The following data were obtained from the question:
Mass (m) of object = 2 Kg
Height (h) = 1 m
Workdone =?
NOTE: Acceleration due to gravity (g) = 9.8 m/s²
Thus, we can obtain the workdone in lifting the object by using the following formula:
Workdone = mgh
Workdone = 2 × 9.8 × 1
Workdone = 19.6 J
Therefore, the workdone in lifting the object to height of 1 m is 19.6 J
What differences were observed between the mixture of salt and sand in 250-mL beaker and the same materials after water was added?
[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
Here's what we observed in the following two scenarios :
When the mixture of salt and sand is placed in a beaker, they form a heterogeneous mixture, and it is a bit troublesome to separate those two
But when water is added to the mixture, salt gets dissolved in it, whereas sand doesn't and it settles down with time, amd here we can easily separate sand and salt mixture, we just need to take out the water when sand has settled and just heat it to get salt back.
If Gold and Copper cost the same, which would you rather have? Explain your answer with evidence and reasoning.
Answer:
Copper and silver are the best conductors, but gold connections outlast both of them because they do not tarnish. It is not that the gold lasts longer, but that it remains conductive for a longer time. Gold is ductile: It can be drawn out into the thinnest wire.
Explanation:
BROOO PLEASE HELP ME
Answer:
Flask d
Explanation:
I promise u it’s flask d
A 100 cm³ measuring cylinder has an uncertainty of ± 1.00 cm³. A student used the measuring cylinder to measure 25.00 cm³ of a
solution into a burette. The burette has an uncertainty of 0.05 cm³. Assuming no other errors what range of readingscould the burette
give for the accurate transfer of the 25.00 cm³ of solution.
Every burette reading must have two decimal places, with the second number being either 0 or 5. A percentage error of 0.2% is produced for each reading by a one-drop mistake in a volume of 25.00 cm3. You could attempt to put the measurements and methods together.
In terms of percentage, relative uncertainty equals x x 100. If we know the relative uncertainty, we may use the formula absolute uncertainty = relative uncertainty 100 measured value to determine the absolute uncertainty. As a result, the uncertainty of the mass measurement and the uncertainty of the density determination affect the uncertainty of the volume, which means that the factors determining the uncertainty accumulate as each physical quantity is measured.
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Would the molecule "Mg20" occur in real life?
Explain.
Answer:
No, it will not exist in real life
Explanation:
Let us consider the electronic configuration of magnesium; Ne 3s2
We must also assume that the compound Mg20 is ionic. If this is the case, then it involve Mg+ and O^2-.
The electronic configuration of Mg+ is Ne 3s1. We can see that this specie has not yet attained a stable noble gas configuration, As a result of this, the ion is not stable. Hence, Mg20 does not occur in real life,
Complete table below, using the diagram of an atom shown at right.
8 A
-0
name
symbol
=
I
Properties of subatomic particles
charge
(in multiples of e)
approximate
mass
(amu)
+1
1.0
location
on diagram
A
-1
0.0005
B
D
(choose one) v
(choose one)
V
Answer:
A
Explanation:
because they have 1 process
4. Which form of asexual reproduction describes the process of a cell dividing to
produce a copy?
Answer:
Mitosis
Mitosis is a method of cell division in which a cell divides and produces identical copies of itself.
Explanation:
Andrew gathered several different species of seed plants. Which three characteristics do all the plants most likely
share?
have pollen and flowers; lack phloem
have pollen and rhizoids; lack xylem
have xylem and phloem; lack pollen
have xylem and phloem; lack rhizoids
Answer:
the correct answer is B.....please give me BRAINLEST
Explanation:
im so sorry for being so late to answer
Answer:
B
Explanation:
Which describes a value for density?
Answer:
The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume). The mass of atoms, their size, and how they are arranged determine the density of a substance. Density equals the mass of the substance divided by its volume
Based on the law of conservation of matter, describe the relationship between the mass of the recants, and the mass of the products
Answer:
Mass of reactant and mass of product must be equal.
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
Explanation:
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
Which statement describes an important role of carbon dioxide in Earth’s atmosphere? *
Animals breathe carbon dioxide.
Plants use carbon dioxide to make food.
Carbon dioxide helps animals make proteins.
Carbon dioxide forms clouds that produce rain.
Answer:
Plants use carbon dioxide to make food.
Explanation:
Answer:B
Explanation: i did it
Medical researchers are developing new anticancer drugs that treat a cell culture with a certain compound. Following treatment, the researchers noticed that the culture had stopped growing. Untreated cells from
the same culture, however, continued to grow. These results could indicate that the compound blocks the normal cell cycle. What else could have caused these results?
One reason could be that the compound prevented cells from mutating. The correct option is D.
What is anticancer drug?Any drug that is effective in the treatment of malignant, or cancerous, disease is referred to as an anticancer drug.
Anticancer drugs are classified into several categories, including alkylating agents, antimetabolites, natural products, and hormones.
Chemotherapy, also known as chemotherapy or anticancer medication, is a type of medication used to destroy, kill, shrink, or slow the growth of cancer cells.
As after the treatment, the researchers noticed that the culture had stopped growing, it can be possible that it prevented new mutation.
Thus, the correct option is D.
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Your question seems incomplete, the missing options are:
A. The compound has degraded
B. The compound had no effect
C. The compound killed the treated cell
D. The compound prevented cells from mutating
is The reaction time is different for different stimuli
true or false?
Answer: true
Explanation: In this example, the processes (perceive, process, and respond), are done in a matter of milliseconds, but reaction time can vary depending on a variety of factors: Complexity of the stimulus-The more complex the stimulus, the more information that has to be processed, the longer this process will take.
A 10.0-mL sample of an unknown H3PO4 solution requires 112 mL of 0.100 M KOH to completely react with the H3PO4. What was the concentration of the unknown H3PO4 solution
Answer:
The correct answer is 0.373 M.
Explanation:
The reaction will be,
H3PO4 (aq) + 3KOH (aq) ⇔ 3H2O (l) + K3PO4 (aq)
Based on the given information, the molarity of the solution KOH is 0.100 M, the volume of the solution given is 112 ml or 0.112 L.
The molarity of the solution with respect to KOH is,
M = Moles/Volume of Solution (liters)
Moles of solute = Molarity * Volume of solution
Moles = 0.100 M * 0.112 L
= 0.0112 moles
From the reaction it is clear that 3 moles of KOH needed 1 mole of H3PO4, thus, 0.0112 moles of KOH will require,
1/3 * 0.0112 = 0.00373 moles of H3PO4
The volume of the H3PO4 solution is 10 ml or 0.01 L.
The molarity of the solution will be,
M = Moles/ Volume of Solution (liters)
M = 0.00373/0.01 = 0.373 M
Thus, the concentration of the solution is 0.373 M.
The concentration of the H3PO4 would be 0.37 M
Going by the balanced equation of the reaction:
[tex]3KOH + H_3PO_4 ---> 3H_2O + K_3PO_4[/tex]
The mole ratio of KOH to H3PO4 is 3:1.
Using the equation: CaVa/CbVb = 1/3
What we are looking for is Ca:
Ca = CbVb/3Va
= 0.1 x 112/3 x 10
= 0.37 M
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The symbol for a radioactive nuclide is Superscript 234 subscript 90 upper T h.. Which statement is correct?
The atomic number of the radioactive nuclide is 90.
The mass number of the radioactive nuclide is 144.
The number of neutrons that are present in the nucleus of each atom is 324.
The number of protons that are present in the nucleus of each atom is 234.
The correct statement : The atomic number of the radioactive nuclide is 90.
Further explanationIn the following element notation,
[tex]\large {{{A} \atop {Z}} \right X}[/tex]
X = symbol of elemental atom
A = mass number
= number of protons + number of neutrons
Z = atomic number
= number of protons = number of electrons, on neutral elements
The symbol for a radioactive nuclide :
[tex]\tt ^{234}_{90}Th[/tex]
atomic number = 90
mass number = 234
number of neutrons = 234-90=144
number of protons = atomic number = 90
Answer:
A on EDG
Explanation:
How many moles of hydrochloric acid will react with one mole of aluminum hydroxide to produce a neutral solution
Answer: 3 moles of HCl
Explanation: let’s do a balanced chemical equation
Al(OH)3 + 3HCl —> AlCl3 + 3H2O
We see that for every 1 mole of Al(OH)3 we need 3 moles of HCl
Can someone tell me how to find the coefficients?
Answer:
2C2H6 + 7O2 → 4CO2 + 6H2O
Explanation:
First off you find them by balancing the equation ( equal amounts of elements on both sides) So add a two infront of the C2H6. Now you have 4 Carbons and 12 Hydrogens on the left aswell as 2 oxygens.
Now go to the right side and put a 4 infront of CO2 and a 6 infront of H2O. You now have 4 carbons 12 hydrogens and 14 oxygens on the right side.
Finally go back to the let side and place a 7 infront to make the left have 14 oxygens just like in the right. A trick to use is to save the coefficients with only one element till the end so you can do less work in the long run.
But i hope this helped its balanced and down to the smallest whole numbers possible most teachers want whole numbers as the coefficient.
These are tricky at first but once you practice a bit you will be a pro.
What would the isotope symbol (in hyphen notation) look like for an atom that has a mass number of 204 and an atomic number of 82?
O a
Lead-82
ob
Thallium-204
Ос
Lead-204
Thallium-82
Od
HELP ASAP
Answer:
[tex]\boxed {\boxed {\sf C. \ Lead-204}}[/tex]
Explanation:
One way of writing an isotope is hyphen notation or:
element name - mass numberWe know the mass number (protons and neutrons) is 204. We can automatically eliminate choices A and C, because they claim the mass number is 82.
Now we must find the element name. We know the atomic number or number of protons is 82. Look on the periodic table for the element with atomic number 82, which is lead.
Therefore,
element name = Lead mass number = 204The isotope notation in hyphen notation is: Lead-204
according to the big bang theory, which describes the universe before the actual big bang occurred?
Answer:
the answer is hot,dense points; each smaller than an atom
Explanation:
the big bang theory was proposed to suggest the expansion of the universe by describing the origin of all components of the universe and its planetary bodies. its suggested that the whole universe was in a state of high temperature and highly dense points (which were smaller than atoms) but continuously expanded by cooling down which gave rise to the formation of subatomic particles, atoms, etc.
btw I found this on brainly
A 9.70-g piece of solid CO 2 is allowed to sublime in a balloon. The final volume of the balloon is 1.00 L at 298 K. What is the pressure of the gas inside the balloon?
a. 5.39 atmb. 2.37 102 atmc. 2.52 atmd. 0.186 atme. none of these
Answer:
a. 5.39 atm
Explanation:
Pressure = ?
Volume = 1 L
Temperature = 298 K
Mass = 9.70g
The formular relating these variables is the ideal gas equation;
PV = nRT
where R = gas constant = 0.082057 L.atm.K-1.mol-1
n can be obtained from the formular below;
n = mass / molar mass = 9.70 / 44
n = 0.2205 mol
P = nRT / V
P = 0.2205 * 0.082057 * 298 / 1
P = 5.392 atm
The correct option is option A.
Carbon dioxide readily absorbs radiation with an energy of 4.67×10−20 J. What is the wavelength () and frequency () of this radiation?
Frequency is in m. and the wavelength is 7.04 x10^13 s-1
it is not 4.26x10^-7
The carbon dioxide readily absorbs radiation with an energy of 4.67×10⁻²⁰J and wavelength is 7.04 x 10¹³, then the frequency is 4.26 x 10⁻¹¹ m.
What is frequency?Frequency can be defined as the number of occurrences of a repeating event per unit of time. It is also known as temporal frequency to emphasizes the contract to spatial frequency and can be called as ordinary frequency to emphasize the contract to angular frequency. It is denoted by f.
f = hc / ∧
f = 6.626 x 10⁻³⁴ x 3.0 x 10³ / 4.67 x 10⁻²⁰
f = 4.26 x 10⁻¹¹ m
Thus, carbon dioxide readily absorbs radiation with an energy of 4.67×10⁻²⁰J and wavelength is 7.04 x 10¹³, then the frequency is 4.26 x 10⁻¹¹ m.
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A family pool holds 10,000 gallons of water.
How many liters is this?
Answer:
45460.9
Explanation:
Answer:
37854.12
Explanation:
for every 1 US gallon there is 3.78541 liters. So if there is 10,000 gallons, you would multiply 3.78541 by 10,000.
3. Which element is more reactive?
a. Calcium (Ca)
b. Titanium (Ti)
C. Silver (Ag)
d. Rubidium (Rb)
Answer:
titanium
Explanation:
according to my knowledge titanium is more expensive than diamonds....A country becomes powerfull by having more quantity of titanium....all the bombs, nuclear weapons and nuclear enegry are made from titanium so it is expensive and powerfull too..
Which gas law is represented by the following equation: V1/T1 = V2/T2
Gay-Lussac's law
Boyle's law
Avogadro's law
none of these
Charles's law
Answer:
Charles's law
Explanation:
The expression:
V1/T1 = V2/T2
represents Charles's law
The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".
So,
V1/T1 = V2/T2
Pressure and the number of moles are constant
V and T are the volume and temperature
1 and 2 are the initial and final states.
Answer:
charle's law
Explanation:
Would you expect the properties of rubidium (Rb) to be more similar to
potassium (K) or strontium (Sr)? Explain. *
The following chemical reaction, KOH + HCl --> KCl + H2O is a ______________ reaction and the salt is _____________. a double replacement; potassium chloride b acid-base; potassium chloride c single replacement; potassium chloride d choice 1 and choice 2
The answer to the above question is B.
The following chemical reaction KOH + HCl → KCl + H2O is a type of single replacement reaction and the salt is Pottasium chloride.
What is a single replacement reaction?A single replacement reaction is a type of reaction that involves the substitution of one element in a compound with another.
The following reaction is given in this question;
KOH + HCl → KCl + H2O
Pottasium displaces hydrogen in this equation to form pottasium chloride salt. Therefore, it is a type of single replacement reaction.
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How do you separate alcoh0l from water?
Answer:
Fractional distillation
Explanation:
How many moles of HCL are in 18 grams? (Use the molar mass to convert miles to grams. Round you answer to 2 decimal places.)
Answer:
0.49 mol HCl
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
18 g HCl
Step 2: Identify Conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar mass of HCl - 1.01 + 35.45 = 36.46 g/mol
Step 3: Convert
[tex]18 \ g \ HCl(\frac{1 \ mol \ HCl}{36.46 \ g \ HCl} )[/tex] = 0.493692 mol HCl
Step 4: Check
Round our answer to 2 decimal places.
0.493692 mol HCl ≈ 0.49 mol HCl
Answer:
0.49 mol
Explanation:
mol=given mass /molecular mass : = 18/36.5 =0.49