Answer:
The hotter one loses heat and the cooler one gains heat until they become equal in temperature.
If Iridium (element 77) emits radiation and becomes platinum (element 78) what type of radiation is emitted?
Answer:
Beta
Explanation:
Cause it emits in and become platinum so I believe its beta
If Iridium (element 77) emits radiation and becomes platinum (element 78) gamma rays of radiation is emitted by the element.
What is radiation?Radiation in the chemistry is a branch of nuclear chemistry which deals with the study of the chemical effects of radiation of alpha beta and gamma rays on matter or any radioactive atom of periodic table.
This is very different from radio-chemistry as no radioactivity or radioactive rays needs to be present in the material which is being chemically changed by the radiation by removing proton from the nucleus.
Therefore, Iridium (element 77) emits radiation and becomes platinum (element 78) gamma rays of radiation is emitted by the element.
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What is the molarity of a solution that has 450 grams of sodium chloride in 800.0 mL of
water?
Answer:
= 9.6125M
Explanation:
data:
volume = 800ml
800/ 1000 = 0.8dm^3
molar mass of NaCl = 23 + 35.5
= 58.5g
mass of NaCl = 450 g
moles= ?
molarity = ?
solution:
no. of moles = [tex]\frac{given mass}{molar mass}[/tex]
= 450 / 58.5
= 7.69 moles
now, molarity = [tex]\frac{moles}{volume in dm^3}[/tex]
= 7.69 / 0.8
molarity= 9.6125 M
7. Which is an example of a good insulator?
iron
copper
silver
rubber
Answer:
Rubber is an insulator.
Remaining three are metals and hence conductors.
Complete the chemical equations and balance them
HCl + KOH → __________ + ____________
H₃PO₄ + NaOH→__________ + ____________
H₂CO₃+ Ca(OH)₂→__________ + ____________
Answer:
KCl+H2O
Na3PO+H2O
CaCO3+H2O
Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
0.0030 × 8.65= [?]
Answer: 0.02595 is your answer I looked it up
Answer:
.03
Explanation:
At equilibrium,
a, the forward reaction rate is lower than the reverse reaction rate.
b. the forward reaction rate is higher than the reverse reaction rate.
c. the forward reaction rate is equal to the reverse reaction rate.
d. po reactions take place.
[tex]{\large{\red{\mapsto{\maltese{\underline{\green{\boxed{\blue{\underbrace{\overbrace{\pink{\pmb{\bf{Answer:}}}}}}}}}}}}}}[/tex]
C. the forward reaction rate is equal to the reverse reaction rate
Chemical equilibrium is dynamic in nature and it can be attained only if the system is a closed one. At equilibrium the forward reaction rate is equal to the reverse reaction rate. The correct option is C.
What is chemical equilibrium?The state of a system in which the measurable properties of the system do not undergo any further noticeable change under a particular set of conditions is called the state of equilibrium. The properties like pressure, concentration, etc. is constant at equilibrium and remain unchanged thereafter.
An equilibrium can be attained from either direction, i.e., from the direction of the reactants as well as from the direction of the products. At equilibrium the rate of forward reaction is equal to that of the backward direction.
In forward reaction, the reactants are converted into products and in backward reaction, the products are changed into the reactants.
Thus the correct option is C.
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1- If 154.0 grams of potassium metal reacts with excess water, then how many grams of
potassium hydroxide and hydrogen gas are formed? What volume of hydrogen gas, in liters, is formed at STP? Be sure to balance the reaction first.
___K(s) + ____H2O(l) → ____KOH(aq) + ____H2(g)
2- The burning of solid sulfur in air produces sulfur dioxide gas.
S + O2 → SO2
Balance the reaction. How many moles of sulfur dioxide does the burning of 3 moles of sulfur form? Calculate the volume of sulfur dioxide produced at STP.
So
4K+4H_2O—⟩4KOH+2H_2Moles of Potassium
154/393.9molSee molar ratio is same for K,KOH,H_2O i.e 4 .
So same moles of allMass of Water
3.9(18)70.2gMass of KOH
56(3.9)218.4g#2
S+O_2—»SO_2Balanced already
3 mols of S form 3 mol SO_2
At STP 1mol=22.4L
Volume=22.4(3)=67.2Lword equation for BaCl2(aq) + Na2Cr4(aq) → BaCrO4(s) + NaCl(aq)
Explanation:
Word Equation
Barium Chloride + Sodium Chromate = Sodium Chloride + Barium Chromate
1 mole of aqueous Barium Chloride [BaCl2] reacts with 1 mole of aqueous Sodium Chromate [Na2CrO4] to form 2 moles of aqueous Sodium Chloride [NaCl] and 1 mole of solid Barium Chromate [BaCrO4]
Help me out Anyone know these Answers ?
What kind of reaction is symbolized by AB + C → CB + A?
O A. Synthesis
O B. Single replacement
O C. Double replacement
O D. Decomposition
Answer:
B. Single replacement.
Explanation:
The A in compound AB was replaced by C to make CB. Since there was only one instance of replacement, it is a single replacement reaction.
if a helium filled ballon has a volume of 3.4l at 25°c and 1.18atm., what is its volume at STP?
Answer:
3.711 L
Explanation:
The formula you need to use is the following:
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\[/tex]
3.4L / 298 K = V2 / 273 K
V2 = 3.711 L
What are the values ?
Why do a human and monkey look different? the location of the DNA in a cell the type of cells the organization of cell structures the DNA sequence
Answer:
DNA sequence
Explanation:
When we say our DNA is different , we mean the sequence, or coding, of DNA is different
The temperature of 2,000.0 g water is raised 3.00°C. How much
energy is transferred to the water. Use the formula below and use your
notes. The specific heat (Cp) for water is 4.18 J/g • °C. Round to three
significant digits. See your notes and slides.
Answer:
25 080 j ( Rounded to 25100 j)
Explanation:
FROM THE EQUATION
?? = 4.18 * 2000 * (3) = 25 080 j
You place a large pear on a scale and it shows a mass of 200 grams. What is the mass of that pear in centigrams? Remember: King Henry Doesn’t Usually Drink Chocolate Milk! 2 centigrams 20,000 centigrams 2,000 centigrams 20 centigrams
Answer:
20,000 centigrams
Explanation:
What is the [H+] in a solution if the [OH-] = 5.42 x 10-5 M
The hydrogen ion concentration is [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .
What is pH scale ?The pH scale is used to rank solutions in terms of how acidic or how basic they are.
It indicates the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution.
These ion concentrations are equal in pure water, which has a pH of 7.
The hydrogen ion and hydroxide ion are related as
[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[OH^{-}] }[/tex]
[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[5.42\times10^{-5} ] }[/tex]
[tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M
The hydrogen ion concentration is [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .
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If you had five moles of sodium chloride how many moles of sodium hydroxide could you produce?
Choose all the right answers.
factors produce changes in Earth's surface? You can choose multiple, giving 60 points
A. Erosion
B. Folding
C. Faulting
D. Weathering
Answer:
The answer is Erosion, Weathering,
Explanation:
These all seem to be correct but i know for a fact those two are correct.
50 POINTS PLEASE ANSWER QUICK (bad answers will be reported)
Donna is studying phase changes. She claims that since the three phases have different amounts of energy, molecules in substances gain or lose energy only during phase transitions. What is incorrect about this claim?
Molecules gain or lose energy during any temperature change, not just phase changes.
Molecules do not have any energy changes, because they have a set amount of energy all the time.
Molecules are constantly losing energy, no matter what phase change is happening.
Energy levels are not related to phase changes.
Answer: Molecules gain or lose energy during any temperature change, not just phase changes.
Explanation:
If you think of a heating or cooling curve, even when there isn't a phase change, the kinetic energy of the particles is still changing.
What do you predict will happen to the volume inside a container when pressure & temperature remains constant but the number of particles inside is increased? WHY?
Answer:
increase
Explanation:
The Ideal Gas Equation
PV = nRTV = nRT/PV ∝ nThe volume of a gas is directly proportional to the number of moles it contains. Hence, if the number of particles is increased, then the volume inside the container will increase
What happens to the pressure and the molecules inside a unicycle tire that is being pumped up?
A. The pressure decreases, and the molecules slow down.
B. The pressure increases, and the molecules collide with the tire's inner surface.
C. The pressure increases, and the molecules slow down.
D. The pressure decreases, and the molecules collide with the tire's inner surface.
Name the following branched alkanes. Two of these are isomers of each other, put a star ★ in their boxes.
Answer:
Structure 1:
The longest chain is made up of 4 carbons (butane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylbutane.
Structure 2:
The longest chain is made up of 7 carbons (heptane). There is a 2-carbon branch (ethyl). The lowest possible position of the branch is on the 4th carbon. This makes the alkane: 4-ethylheptane.
Structure 3:
The longest chain is made up of 4 carbons (butane). There are 2, 1-carbon branches (dimethyl). The lowest possible position of both branches is on the 2nd carbon. This makes the alkane: 2,2-dimethylbutane.
Structure 4:
The longest chain is made up of 3 carbons (propane). There are 2, 1-carbon branches (dimethyl). The lowest possible position of both branches is on the 2nd carbon. This makes the alkane: 2,2-dimethylpropane.
Structure 5:
The longest chain is made up of 6 carbons (hexane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylhexane.
Structure 6:
The longest chain is made up of 3 carbons (propane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylpropane.
The isomers are structures 1 and 4 because they contain the same amount of carbons (5) and hydrogens (12) while assuming different structures.
What’s the purpose ?
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Arrow head shows the direction of products formed in a reaction. so we can say that it denotes the direction of the chemical reaction. I.e From Reactant to Product.
so, the correct choice is B
Water is weird because in the solid-state the molecules are ________then when water is in its liquid state all other liquid to get ________when they freeze solid
Answer:
Water is weird because in solid state The molecules are combine then in liquid state they are wide apart.
How many moles of sodium chloride (NaCl) are in (4.2x10^-41) molecules of sodium chloride (NaCl)?
The number of moles of sodium chloride in (4.2 x 10⁻⁴¹) molecules of sodium chloride is 6.973 × 10⁻⁶⁵
What are a number of moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
1 mole is 6.022 × 10²³
[tex]1\; molecule = \dfrac{1}{6.023 \times 10^2^3}[/tex]
The given number of moles are 4.2 x 10⁻⁴¹
[tex]Moles = 4.2 \times 10^-^4^1 \times \dfrac{1}{6.023 \times 10^2^3} = 6.973 \times 10^{-65}[/tex]
Thus, the number of moles of sodium chloride in (4.2 x 10⁻⁴¹) molecules of sodium chloride is 6.973 × 10⁻⁶⁵
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Help with Chemistry Thank You To Who Ever Helps Things Have Been Hard For Me.
Answer:
1.The electonic configuration of elements and their position in the periodic table are related to each other, From the electronic configuration of the elements, we can determine the period and the group to which the element belongs
Let's consider, sodium with atomic number 11 and k, l, and M shells have 2,8,and 1 electrons. since, there are 3 principal energy levels so we concluded sodium belongs to third period M Shell(valance shell) has only 1 electrons. so sodium belongs to group 1.
2. Entire D-block elements are known as Transition Elements.
3. Group 17 is the halogen group.
4. Main group of elements are...... 1,2, and 13 through 18.
5. Group 18 are the noble gas elements .
12. a). Smaller
b). Increases
c). More reactive
d). Softer
7. a). k › Ca › Ge › Br › Kr
b). Ra › Ba › Sr › Ca › Mg › Be
9. a). Ca(calcium) ion is smaller.
b). Cl(chlorine) atom is smaller.
c). Mg(magnesium) atom is smaller.
10. a). F(fluorine)
b). Sr(strontium)
c). Pb(lead)
d). At(Astatine)
What is the molarity of ions in a 0.339 M solution of MgBr₂ assuming the compound dissociates completely?
Molarity is the molar concentration of the solution with respect to the moles and the volume. The molarity of the magnesium ion will be 0.339 M, and the Bromium ion will be 0.678M.
What is molarity?Molarity is the proportion of the moles of the solute to the volume in liters of the solution present. The compound magnesium bromide completely dissociates as:
MgBr² ⇆ Mg⁺² + 2Br⁻
The molarity of the magnesium ion will be equal to the M of the magnesium bromide and hence, will be 0.339 M.
The molarity of the bromide ions will be equal to two times the M of the magnesium bromide species and hence is 0.678 M.
Therefore, the molarity of the magnesium ion will be 0.339 M, and the Bromium ion will be 0.678M.
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Please Help Me with this
Answer:
compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.
Explanation:
hope this helps
can u please give me and Brainlist
what are chemistry products
Answer:
Products are the species formed from chemical reactions. During a chemical reaction reactants are transformed into products after passing through a high energy transition state. This process results in the consumption of the reactants.
Explanation:
hope this helps if not let me know have a great day
What happens to the distance between molecules when a substance changes from a liquid to a gas? Why?
Answer: As the substance changes from a liquid to a gas, bonds within its molecules almost dissapear and the average distance between them.
Explanation: