Answer:
magnesium
Explanation:
it is the only metal in the choices. everything else is on the right side of the old line that separates metals and nonmetals on the PPT. nonmetals aren't, shiny or good conductors or malleable or ductile. only metals can have those qualities. the only metal is magnesium
9. 1.2 x 102 yd =
10. 1535 fl. oz. =
L
Answer:
9. 122.4 yards
10. 45.395 litres
For a certain chemical reaction, the bond energy of the reactants is 43 kJ, and 35 kJ of energy is released. For energy to be conserved, what is the bond energy of the products?
Answer:
78kJ
Explanation:
Energy change = Energy in (reactants) - Energy out (products)
According to this question, energy is released, meaning that the reaction is EXOTHERMIC. Hence, the energy change will be negative (-) i.e bond energy of reactants is greater than bond energy of products.
Energy in = bond energy of reactants = 43kJ
Energy out = bond energy of products = ?
Energy change of exothermic reaction = -35kJ
Therefore;
-35kJ = 43kJ - x
x = 35kJ + 43kJ
x = 78kJ
The bond energy of the products is 78kJ.
POSSIBLE POINTS: 1
Please read the example carefully and choose the best answer below.
Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-
up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job
of cutting through the stains. Marie places masking tape in the dry shower to create 5 sections for her
experiment. She sprays 3 squirts of one cleaner per section and leaves the remaining section untouched to
compare her results. After 30 minutes, and without scrubbing any of the cleaner in, she records her
observations.
In this example what is the independent variable?
Answer:
CLEANER
Explanation:
Independent variable is the variable in an experiment that is changed or manipulated by the experimenter in order to bring about a measurable response.
In this question, Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job of cutting through the stains. The CLEANERS being changed in this experiment is the INDEPENDENT VARIABLE.
How do limestones that begins as a coral be found on land?
Answer:The limestone began to form millions of years ago, when the land was under the ocean. The rock developed from shells of tiny organisms that float in the ocean. ... However, in the case of reefs, the limestone is produced directly as coral organisms build their skeletons one on top of another.
A gas occupies a volume of 0.444 L at 0.00C and
79.00 kPa. What is the final Kelvin temperature when
the volume of the gas is changed to 1880. mL and the
pressure is changed to 38.70 kPa?
Include unit of measurement and use proper
significant figures.
Answer:
The final temperature is 566°K
Explanation:
Given
V1 = 0.444L
T1 = 0.00°C
P1 = 79.00 kPa
V2 = 1880mL
P2 = 38.70 kPa
Required
Determine the final temperature of the gas
To answer this, we make use of idea gas law equation.
This is:
(P1V1)/T1 = (P2V2)/T2
Convert V1 to mL
V1 = 0.444L
V1 = 0.444 * 1000mL
V1 = 444mL
Convert T1 to Kelvin
T1 = 0.00°C
T1 = 0.00 + 273K
T1 = 273K
Substitute these values in the given equation.
(P1V1)/T1 = (P2V2)/T2
(79 * 444)/273 = (38.70 * 1880)/T2
35076/273 = 72756/T2
Cross Multiply
35076 * T2 = 273 * 72756
35076T2 = 19862388
Make T2 the subject
T2 = 19862388 ÷ 35076
T2 = 566K (approximated)
Hence, the final temperature is 566°K
I'm a bit stupid, that's why I'm going to ask for help, can you be nice and help me? Thank you
Explanation:
ion
valence electrons
isotope
covalence
ionic
What mass of sulphuric acid can be made from 8g of SO3
(SO3+H2O==>H2S04)
09.8g
18.2g
Answer:
10 g H₂SO₄
General Formulas and Concepts:
Chemistry - Stoichiometry
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
Given: 8 g SO₃
RxN: SO₃ + H₂O → H₂SO₄
Step 2: Identify Conversions
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of SO₃ - 32.07 + 3(16.00) = 80.07 g/mol
Molar mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol
Step 3: Stoichiometry
[tex]8 \ g \ SO_3(\frac{1 \ mol \ SO_3}{80.07 \ g \ SO_3} )(\frac{1 \ mol \ H_2SO_4}{1 \ mol \ SO_3} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )[/tex] = 9.80042 g H₂SO₄
Step 4: Check
We are given 1 sig fig. Follow sig fig rules and round.
9.80042 g H₂SO₄ ≈ 10 g H₂SO₄
1. Under what conditions can potassium bromide conduct electricity?
A only when melted
B. when melted or dissolved in water
C. only when it is in crystal form
D. only when dissolved
Answer:
potassium bromide can only conduct electricity when in an aqueous solution due to the electrostatic force between the ionic bonds
The potassium bromide can conduct electricity when melted or dissolved in water. Therefore, option (B) is correct.
What are ionic compounds?The crystalline solids which are formed by closely packed ions of opposite charge are called ionic compounds. In ionic compounds, the ions are connected with each other by ionic bonds in solis state.
The elements which can gain or lose electrons to attain their nearest noble gas configuration participate in the formation of ionic compounds. The solid ionic compound cannot able to conduct electricity.
In the melted state, the ions of K⁺ and Br⁻ can move from their fixed positions. Therefore, the KBr can conduct electricity when melted or dissolved in water.
The ionic compounds are able to conduct electricity in melted or dissolved in water. Because only in these states the ins can move freely while in the crystalline state the ions cannot move freely to conduct electricity.
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How is a "decay event' recorded
NH4, C032. OH", and PO43- are all examples of
Answer:
the popultion of it
Explanation:
NH₄+ , (CO₃)₂- , OH- , (PO₄)₃- are all examples of polyatomic ions.
What are Polyatomic ions?A covalent bound type of collection of two or more atoms or of a metal complex that can be said as behaving as a single unit and that has a net charge which is not zero is referred to as a polyatomic ion or a molecular ion.
Depending on the terminology , a polyatomic ion may or may not be referred to as a molecule. The Greek word poly- that means "many," although even ions made of just two atoms are frequently referred to be polyatomic.
A polyatomic ion may also be referred to as a radical (or less commonly, as a radical group).
The term "radical" today refers to a variety of free radicals, which are species with an unpaired electron and do not require a charge.
The hydroxide ion, which has the chemical formula OH- and is made up of one oxygen and one hydrogen atom and has a net charge of 1, is a straightforward example of a polyatomic ion.
A nitrogen atom, four hydrogen atoms, and a charge of +1 make up an ammonium ion, which has the chemical formula NH₄+.
In the context of acid-base chemistry and the production of salts, polyatomic ions are frequently helpful.
A polyatomic ion is frequently thought of as the conjugate base or acid of a neutral molecule. For instance, the polyatomic hydrogen (H₂) sulphate anion (SO₄) is the conjugate base of sulfuric acid (H₂SO₄). The sulphate anion (SO₄)₂ is created when another hydrogen ion is eliminated.
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BRAINLIEST! Please help me answer the following questions:
1) How do you find the valency of an element?
2) How do you determine if an element is nuetral/an isotope/ or an ion?
If you could help with 1 or both questions I would really appreciate it :)
Explanation:
1) from the periodic table for example if u looking for K it is from the group 1A so the valancey = +1 that is mean it loses one electron to reach a stable state. and this applied for the 1A , 2A, 3A groups.
if u looking for N it is from group 5A so its valency is -3
so it gain 3 electrons to reach a stable state to complete its orbital to 8 electrons. this applied to 5A, 6A,7A
for the transition metals and simimetals other rules.
2) neutral if the element does not hold any charge like
H2, O2, N2, Fe, Au, Cu ...
isotope : if the 2 elements have same symbol and atomic number but they differ in the mass number because the have different numbers of neutrons.
if the element is charged then it is considered as an ion ex: Fe2+ then it is iron cation ( +ion)
F- then it is fluoride anion (-ion)
if u have any doubt just writ a comment ( ;
Use the equation below to solve the problem that follows.
2H2 (g) + O2 (g) → 2H2O (g)
When David reacts 13.8 grams of hydrogen gas with excess oxygen, 87.0 grams of water are formed. Calculate his percent yield of water.
Percent yield = 70%
Further eplanationPercent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
2H₂ (g) + O₂ (g) → 2H₂O (g)
mass of H₂O (theoretical) :[tex]\tt mass=mol\times MW(mol~ratio~H_2O\div H_2=2\div 2)\\\\mass=(\dfrac{2}{2}\times \dfrac{13.8}{2})\times 18~g/mol\\\\mass=124.2~g[/tex]
percent yield[tex]\tt \%yield=\dfrac{87}{124.2}\times 100\%=\boxed{\bold{70\%}}[/tex]
WILL GIVE BRANLIEST!!
Carbon tetrachloride (CCl4) is
ionic
covalent
Answer:
Covalent
Explanation:
In the carbon tetrachloride molecule, four chlorine atoms are positioned symmetrically as corners in a tetrahedral configuration joined to a central carbon atom by single covalent bonds
Answer:
Carbon tetrachloride (CCl4) is ✔ covalent.
Answers to assignment question:
What properties would you expect for CCl4? Select all that apply.
It is likely a gas or liquid at room temperature.
It is likely soluble in water.
It will likely light up a bulb in a conductivity apparatus.
It will likely have a high melting point.
Calcium oxide (CaO) is ✔ ionic.
What properties would you expect for CaO? Select all that apply.
It is likely a gas or liquid at room temperature.
It is likely soluble in water.
It will likely light up a bulb in a conductivity apparatus.
It will likely have a high melting point.
Explanation:
all correct on edge! :D
a. Rub the magnet along the nail or knitting needle. Now try picking up the paper clip or tack. Could your nail pick it up? How many can it pick up at once?
b. Now try to make your magnet stronger by rubbing the magnet along the nail or knitting needle for a longer time. Rub only in one direction, not back and forth. This will increase the number of atoms that line up with the magnet. Try to pick up paper clips or thumbtacks. How many can it pick up now?
Answer:
ight i'll answer both rq
Explanation:
a. Rub the magnet along the nail or knitting needle. Now try picking up the paper clip or
tack. Could your nail pick it up? How many can it pick up at once?
after rubbing the magnet with the nail, it could pick up 7 small paper clips.
b. Now try to make your magnet stronger by rubbing the magnet along the nail or knitting
needle for a longer time. Rub only in one direction, not back and forth. This will increase
the number of atoms that line up with the magnet. Try to pick up paper clips or
thumbtacks. How many can it pick up now?
after rubbing it a second time but for a longer period, it could pick up around 10, almost lifting the 11th.
Answer:
A. After rubbing the magnet with the nail, it could pick up 7 small paper clips.
B. After rubbing it a second time but for a longer period, it could pick up around 10 small paper clips, almost lifting the 11th one.
What information can a foliated metamorphic rock provide you about the conditions under which it formed?
Help please! Tell me which one goes where.
Answer:
human-F
chicken-D
rabbit-E
tortoise-C
salamander-B
fish-A
Explanation:
hope this helped!!
I tried my best!!
please mark me as brainliest
HAVE A GREAT DAY <3
Answer:
D Tortoise
B Salamander
A Fish
C Chicken
F Human
E Rabbits
Explanation:
I Really have an Explanation
H2 (g) + F2 (g) ----- > HF(g) *
What type of reaction?
Answer: Hydrogen fluoride
Explanation:
What happens to the energy release of an exothermic reaction?
1.It increases the bond energy of the reactants.
2.It is released to the surroundings.
3.It raises the temperature of the reactants.
Answer:
2.It is released to the surroundings.
Explanation:
In an exothermic reaction, the energy released is to the environment. At the end of the reaction, the surrounding becomes hotter than the system where the reaction is taking place.
Heat is liberated to the surrounding in an exothermic change. At the end of this change, the surrounding becomes hotter. Examples are combustion, dissolution of substances, etc.how would one convert 36 yd to centimeters?
Answer:
3291.84 cm
Explanation:
you would multiply the amount of yards you have by 91.44, since that's how many centimeters there are in 1 yd.
Answer: it’s D
Explanation:
An object has a mass of 60 ounces and a volume of 30 cups. What is the density? _______ oz/cup (your answer should *only* be a number, round to one decimal place if needed) *
Answer:
2.0
Explanation:
Given data:
Mass of object = 60 ounce
Volume of object = 30 cups
Density = ?
Solution:
d = mass/ volume
d = 60 ounce/ 30 cup
d = 2.0 oz/cup
Thus, density of object is 2.0 oz/cup.
Compare physical change and chemical change in terms of the arrangement of the particles and the changes in number of atoms or types of atoms?
Answer:
Don not sure if you got my last email I sent you a text but different question
The _____ law of thermodynamics states that when two objects of different temperature are in contact, heat energy will flow from the hotter to the cooler object.
Answer:
Second.
Explanation:
There are four types or kinds of the laws of thermodynamics, but in this question we are actually considering the second law of thermodynamics.
The second law of thermodynamics, in a simple sense means that energies can flow in an equilibrate manner. It can also be stated as the total entropy of the universe. The second law is normal refer to as Law concerning Entropy.
Thus, filling the gap in the Question above. Note that the word written in capital letters is the missing word.
"The SECOND law of thermodynamics states that when two objects of different temperature are in contact, heat energy will flow from the hotter to the cooler object."
What are the parts of an electron configuration?
Answer:
Explanation:
electronic confirmation=1s^2,2S^2,2P^6,3S^2
atomic no.is 12 therefore :- this is magnesium
Period=3
Block=s-block
Group=II A
Which characteristic is related to kinetic energy but not potential energy
Answer:
kinectic is movement and potential is still
Explanation:
While kinetic energy of an object is relative to the state of other objects in its environment, potential energy is completely independent of its environment. Hence the acceleration of an object is not evident in the movement of one object, where other objects in the same environment are also in motion.
Answer:an object’s speed
Explanation:
Critical thinking : Place an unmagnetized piece of iron in a magnetic field (eg iron filings near a magnet). Why is it attracted to the magnet?
Magnets attract iron due to the influence of their magnetic field upon the iron. Before a piece of iron enters the magnet, the polarization of the irons atoms is random. When exposed to the magnetic field, the atoms begin to align their electrons with the flow of the magnetic field, which makes the iron magnetized as well. This, in turn, creates an attraction between the two magnetized objects. This is why a piece of iron that is exposed to a magnet becomes magnetic for some time afterward.
Is Steel a compound?
Steel is a mixture of iron and carbon fused together with one or more other metals or nonmetals. Because steel is a mixture rather than a chemical compound, steel does not have a set chemical compound formula.
Answer:
No
Explanation:
Steel is a mixture of iron and carbon fused together with one or more other metals or nonmetals. Because steel is a mixture rather than a chemical compound, steel does not have a set chemical compound formula.
We apply the same amount of energy to 10.0-g samples of aluminum, iron, and silver which begin at the same temperature. Rank the metals from highest to lowest temperature after the heat is applied
Answer:
Ag > Fe > Al
Explanation:
The values of the specific heat capacity of the elements are given as;
Aluminum = 0.897 J/g*K
Iron=0.449 J/g*K
Silver=0.235 J/g*K
Specific heat capacity basically refers to how much heat is required to change the temperature of a unit mass of a substance by a degree. Elements with high specific heat capacity would require higher energy compared to elements with lower values,
Aluminium (Al) has the highest specific heat capacity, hence it wold require more energy to cause a change in temperature. Aluminium would be the lowest.
Silver (Ag) has the lowest specific heat capacity hence it would require less energy to cause a change in temperature. Silver wold be the highest.
The middle would be iron (Fe).
The rank is given as;
Ag > Fe > Al
A bottle has a capacity of 1.2 liters. If the density of ether is 0.74 g/mL, what mass of ether can the bottle hold?
Answer:
Density is a value for mass, such as kg, divided by a value for volume, such as m3. Density is a physical property of a substance that represents the mass of that substance per unit volume. It is a property that can be used to describe a substance. We calculate as follows:
Volume = 60.0 g ( 1 mL / 0.70 g ) = 85.71 mL
Therefore, the correct answer is option B.
Explanation:
888 grams is a mass of ether that the bottle can hold.
Explanation:
The density of the substance is defined as a mass of substance present in the unit volume of the substance.
[tex]Density=\frac{Mass}{Volume}[/tex]
Given:
A bottle with a capacity of 1.2 Liters.
The density of ether = 0.74 g/mL
To find:
The mass of ether hold by a given bottle.
Solution:
The volume of bottle = V = 1.2 L
[tex]1 L = 1000 mL\\V = 1.2 L=1.2\times 1000 mL= 1200 mL[/tex]
The density of the ether = d = 0.74 g/mL
The mass of ether that bottle can hold = m
Volume of ether required = Volume of bottle = V = 1200 mL
Using the formula of density:
[tex]d=\frac{m}{V}\\0.74 g/mL=\frac{m}{1200 mL}\\m=0.74 g/mL\times 1200 mL= 888 g[/tex]
888 grams is a mass of ether that the bottle can hold.
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whats the mass of neon
Answer:
20.17 (or if you want to round .18)
Explanation:
If you ever need help with this again the atomic mass is the number underneath the element name
i need help people :0