Answer:
A . Alkali metalsExplanation:
The highlighted elements of the periodic table belong to the alkali metal element family. The alkali metals are recognized as a group and family of elements. These elements are metals. Sodium and potassium are examples of elements in this family.
hope this helps
PLEASE HELP ME I’ll give brainliest
A P-wave arrived at an epicenter station 4,000 km away at
5:20:00. What time did the first S-wave arrive at this station?
divide 5 hours 20 mins by 4,000
and ur answer is
320 mins/4000km
so
0.08
hope this helps
sorry if its wrong
CH4 + 202 → CO2 + 2H2O
How many grams of O2 produced from 2 moles of H20?
60 g O₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional Analysis Explanation:Step 1: Define
[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O
[Given] 2 mol H₂O
[Solve] x g O₂
Step 2: Identify Conversions
[RxN] 2 mol H₂O → 2 mol O₂
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of O₂ - 2(16.00) = 32.00 g/mol
Step 3: Stoichiometry
Set up conversion: [tex]\displaystyle 2 \ mol \ H_2O(\frac{2 \ mol \ O_2}{2 \ mol \ H_2O})(\frac{32.00 \ g \ O_2}{1 \ mol \ O_2})[/tex]Divide/Multiply: [tex]\displaystyle 64.00 \ g \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 1 sig fig.
64.00 g O₂ ≈ 60 g O₂
Mass of O₂= 64 g
Further explanationGiven
Reaction
CH₄ + 20₂ → CO₂ + 2H₂O
2 moles of H₂O
Required
Mass of O₂
Solution
In a chemical equation, the reaction coefficient shows the mole ratio of the compounds involved in the reaction, reactants or products
From the equation, mol ratio of H₂O : O₂ = 1 : 1, so moles O₂ :
= 1/1 x moles H₂O
= 1/1 x 2
= 2 moles
Mass of O₂ :
= mol x MW
= 2 x 32 g/mol
= 64 g
Three hundred years ago, the amount of CO2 flowing into the atmosphere was equal to the amount flowing out of the atmosphere. This is not true today.
Answer:
true
Explanation:
becaus it chang climate
What is the mass in grams of 1.75 moles of Pb(OH)2?
Answer:
422.1 grams
Explanation:
First find the atomic mass of each element on your periodic table.
Pb = 207.2 amu
O = 16 amu
H = 1 amu
They are two oxygen and two hydrogen atoms. Now add the atomic mass of all the elements together
207.2 + 16(2) + 1(2) = 241.2 grams
Now multiply 241.2 with the 1.75 moles
241.2 * 1.75 = 422.1
So the final answer is 422.1 grams.
Hope it helped!
In the Lewis structure for FeF3, how many lone pairs surround the iron atom?
Answer:
One lone pair
Explanation:
If we follow the valence bond approach of looking at chemical bonding, then we have to consider the electronic configuration of Fe^3+ which is; [Ar] 3d5.
This means that we have three electrons available to combine with three fluorine atoms leaving one lone pair to form FeF3.
Hence, FeF3 has one lone pair of electrons.
What is the difference between high and low silica rocks 
Answer: The difference between granites and basalts is in silica content and their rates of cooling. A basalt is about 53% SiO2, whereas granite is 73%. Intrusive, slowly cooled inside the crust.
Explanation: I hope that helped!
Imagine cutting a bar of pure gold in half, and then cutting it in half again. Could you divide the gold like this forever?
A. The particles will keep dividing forever
B. You cannot divide an atom of gold in half
C. Gold is too strong to be cut in half
D. Aliens exist
Answer:no
Explanation:no
Metals are hard. However, they can be cut into pieces. Gold can be cut into small pieces and can also be converted to sheets or thin wires.
What are metals?
Metals are electropositive elements. They are hard materials and are good conductors. Metals conduct both thermally and electrically they are optically active materials.
Metals can be flattened to sheets by the property called malleability. Similarly metals can be changed to thin wires. This ability is called ductility. They also exhibit luster and crystallinity.
Gold is a transition metal. Gold can be cut into small pieces mechanically. It can be flattened or made thin wires also. Therefore, we can divide metallic gold as long as its bar is there.
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Which choice has prokaryotic cells?
Answers:
human kidney
beet root
Lactobacillus
rose thorn
Answer:
C.) Lactobacillus
Explanation:
Is a prokaryote with a simple rod shaped structure. Similar to other prokaryotic bacterium of its shape it has a cell wall, and capsule.
reflection obtained from a smooth surface is called a
a- regular reflection
b- irregular reflection
C- both a & b
D- none
What kind of hydrocarbon is this? C-C-C-C-C-C-C-C-OH
Please help ASAP
Answer:
1-Octanol
Explanation:
Count the amount of carbon atoms in the chain. Nomenclature includes the position of the largest functional group position in the molecule.
In this case the carbon chain has 8 carbon atoms and one hydroxide functional group (OH)
1 (hydroxide is listed first in the carbon chain) - Oct(8 carbons) + anol (Alkanol hydrocarbon with a hydroxide group, use anol suffix )
= 1 - Octanol
Calculate the concentration of a solution formed by dissolving 5.6 g of potassium
hydroxide in an amount of water to form 500 ml of a solution
The concentration of solution : 0.2 M
Further explanationGiven
5.6 g Potassium hydroxide(KOH)
500 ml of solution = 0.5 L
Required
The concentration
Solution
Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution
MW KOH = 39+16+1=56 g/mol
mol solute(KOH) :
= mass : MW KOH
= 5.6 : 56 g/mol
= 0.1
Molarity :
= 0.1 : 0.5
= 0.2 M
What is a moon phase that looks like less than a half circle from earth?
Answer:
last quarter moon/half moon
Explanation:
They can___ about a fixed point. Particles in a _____ are still close together but are arranged_____ (not in a pattern)
Answer:
A) Oscillate
B) Liquid
C) Loosely
That is, "They can oscillate about a fixed point. Particles in a liquid are still close together but are arranged loosely (not in a pattern)
Explanation:
The above speaks to the various states that matter can be in. They are Gaseous, Liquid, and Solid.
The state described above is the liquid state. Recall that all matter are made up of microscopic particles. These particles when viewed under a microscope are observed to be in a state of continuous motion.
The degree of motion and arrangement is determined by the temprature of the substance. The higher the temperature, the faster and more lose the particles become.
Water for instance would in a liquid state, have its particles oscillate freely about each other giving it the ability to take the shape of the container in which it is put. Its particles are not rigidly fixed together at this point and can slide past each other easily.
In a solid-state (that is ice) the particles become tightly packed and there is less oscillation. Whilst in a gaseous state (vapor, that is) the particles o or molecules are very far apart.
Cheers!
picture included ^^^^^^^^^ (BRAINLIEST)
A compound contains oxygen and chlorine. Its molecular mass is 166.9g. What is the molecular formula if its empirical formula is CIO3?
The molecular formula : Cl₂O₆
Further explanationGiven
Molecular mass = 166.9 g
The empirical formula = ClO₃
Required
The molecular formula
Solution
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
(ClO₃)n=166.9
(35.5+3.16)n=166.9
(83.5)n=166.9
n=2
(ClO₃)2=Cl₂O₆
Describe how energy enters AND moves throughout the different trophic levels of an ecosystem
Answer:
The flow of energy from one trophic level to another creates the energy cycle. In this cycle, energy is neither created nor destroyed. Energy flows from one trophic level to another. The primary source of energy is solar energy. Plants uses solar energy to produce their food by the process of photosynthesis. The food produced by the plants are consumed by the primary consumers. The plan eating animals consume food produced by the plants and they form the second trophic level. In the third tropic level the carnivores get the energy by eating the herbivores. After the death of the carnivores, decomposers act on them and the nutrients are ultimately returned to the soil.
What happens to an acid or a base when it is diluted with water?
Answer:
Adding water to an acid or base will change its pH. Water is mostly water molecules so adding water to an acid or base reduces the concentration of ions in the solution. When an acidic solution is diluted with water the concentration of H+ ions decreases and the pH of the solution increases towards 7. To make the pH change by 1, a tenfold dilution is required (eg adding 9 cm3 of water to 1 cm3 acid). The acid is becoming less acidic. Similarly, when an alkali is diluted with water the concentration of OH- ions decreases. This causes the pH of the alkali to fall towards 7, making the solution less alkaline as more water is added.
Explanation:
Balance the following chemical equation.
Answer:
a) C4H6+2H2=C4H10
b) 4Na+CF4=4NaF+C
c) 2Na+2NH3=2NaNH2+H2
d) 2H202=2H2O+O2
Explanation:
Try and make sure there is the same number of reactants as products
A good indicator that a reaction is a single replacement reaction is if you have a single element and a compound on one side of the arrow, and a single element and a compound on the other side of the arrow as well.
Select one:
True
False
Which of the following particles is the smallest in radius
Answer:
Its helium
Explanation: Because teh effective nuclear charge holds the valence ectrons clos to the nuclues. the Atomic radius would decrease as you move from the led=ft and right of the perodic table
PLEASE HELP ASAP I WILL MARK AS BRAINLYEST
Answer:D
Explanation:I think
How many carbon atoms are in the following compound:
10Fe2(CO3)3
For the balanced equation shown below, if the reaction of 40.8 grams of C6H6O3 produces a 42.8% yield, how many grams of H2O would be produced ?
C6H6O3+6O2=>6CO2+3H2O
Mass of H₂O produced = 7.488 g
Further explanationGiven
40.8 g of C₆H₆O₃
42.8% yield
Required
mass of H₂O
Solution
Reaction
C₆H₆O₃+6O₂=>6CO₂+3H₂O
mol of C₆H₆O₃(MW = 126 g/mol) :
= mass : MW
= 40.8 g : 126 g/mol
= 0.324
Mol H₂O :
= 3/1 x mol C₆H₆O₃
= 3/1 x 0.324
= 0.972
Mass H₂O(theoretical) :
= 0.972 x 18 g/mol
= 17.496 g
%yield = (actual/theoretical) x 100%
0.428 = actual / 17.496
actual = 7.488 g
The only pair that would result in a recessive phenotype is:
AA
Bb
cc
FF
Pls help
Almost 98% of earthquakes occur at the boundary of a tectonic plates when they slide against one another. Despite this, Indiana
still has seismic zones that experience increased seismic activity. This is particularly heavy in the Wabash Valley Fault zone in the
southwest comer of the state. How do you explain how seismic activity is felt in this area?
A)
The Wabash Valley Fault Zone is part of the Pacific plate boundary
B
9
The Wabash Valley Fault Zone is close to the center of the North American
Plate which is where the majority of earthquakes occur.
The Wabash Valley Fault zone is an interplate seismic zone which means
that it lies directly on the boundary of a major tectonic plate
The Wabash Valley Fault Zone is an intraplate seismic zone which means
that seismic activity is felt on the interior of a major tectonic plate
D
Hurry
the only explanation would be that it is on top of a hotspot I don't know if this helps at all
Examine why amusement park rides have
restraint bars to keep people safe. Apply
Newton's first law of motion to your
explanation.
Answer:
Newton's first law of motion states that an object in motion tends to stay in motion. This is what keeps the roller coaster rolling through the hills and turns after it accelerates down the initial ramp. Also, the riders inside the car will experience changes in accleration and apparent weight. The riders will keep going at the same speed in the same direction unless some other force (the seat) acts on them to change that speed or direction. At the bottom of hills, they try to continue downward, and are pressed into the seat. At the tops, the riders are lifted up in their seats as they try to continue upward even as the seat pulls them down into the next drop. The same thing occurs on turns, where riders are pushed into the side of the seat as the coaster turns. (This is the reason for harnesses, seat belts, and restraining bars.)
Explanation:
The chance of getting out moved from the seats is more in riders or on vehicles because, as stated by the first law of motion an object tends to stay in its state unless an external force acts on it. Thus, the ride will tend to move front even after stopped.
What is inertia?Inertia is the tendency an object to continue its state of motion or rest until an external force act on it. This concept is explained by Newton's first law of motion.
This effect can be in many situations. For example in moving bus, when it is suddenly breaked, the travelers will move up front just because of the inertia of the bus. Similarly a stationary bus, when started will initially move back once.
The riders in amusement park will experience the same. Hence, there is a possibility of people moving out from the seat when it is stopping or starting that's why they have restraint bars.
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2C3H7OH + 9O2 --> 6CO2 + 8H2O
Determine the number of grams of CO2 produced from the reaction of 5.55 moles of C3H7OH
733 g CO₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[RxN - Balanced] 2C₃H₇OH + 9O₂ → 6CO₂ + 8H₂O
[Given] 5.55 mol C₃H₇OH
Step 2: Identify Conversions
[RxN] 2 mol C₃H₇OH → 6 CO₂
Molar Mass of C - 12.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol
Step 3: Stoichiometry
Set up conversion: [tex]\displaystyle 5.55 \ mol \ C_3H_7OH(\frac{6 \ mol \ CO_2}{2 \ mol \ C_3H_7OH})(\frac{44.01 \ g \ CO_2}{1 \ mol \ CO_2})[/tex]Multiply/Divide: [tex]\displaystyle 732.767 \ g \ CO_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
732.767 g CO₂ ≈ 733 g CO₂
What is the best way to package and preserve a questioned document?
O In a paper bag
O In a plastic sheet protector
O In aluminum foil
O In a druggist fold
Which two kinds of information describe weather and not climate?
A. The average high temperature for this date over 30 years
B. The temperatures for the previous week
C. How the air pressure is expected to change tonight
D. The usual frequency of blizzards in an area
Answer: how the air pressure is expect to change tonight AND the temp. for the previous week
Explanation:
a p e x
If a reactant has a -1 order, what happens to the initial rate when the concentration of that reactant increases by a factor of two?
Answer:
[tex]\dfrac{1}{2}[/tex]
Explanation:
Let assume that X and Y are the reactants of a given reaction.
Then the rate can be expressed as:
rate = k[X][Y]
Suppose the concentration of X is quadrupled and the rate is doubled.
Then. we have;
[tex]2 \times rate = k[4X]^{\dfrac{1}{2}} [Y][/tex]
So, the initial rate of the concentration will be [tex]\dfrac{1}{2}[/tex] when the concentration of the reactant is increased by a factor of two.
