Answer:
45) Ca < Co < Se
46) Te < S < O
Explanation:
These questions are talking about periodic trends. Here are some things to know about periodic trends:
Electronegativity
how well an element attracts an electronincreases left to right and bottom to top on the periodic tablenoble gases are not includedfluorine is most electronegative element, Francium is leastAtomic Radius
the distance between nucleiincreases from right to left and top to bottom on the periodic table the more electronegative an element is, the smaller it's atomic radiusFrancium has the largest atomic radius while fluorine has the smallestIonization Energy
the energy required to remove an electrondirectly proportional to electronegativityMetallic Character
how closely an element's properties match those of a metaldirectly proportional with atomic radiusHope this helps :)
1. If humans increase the amount of carbon dioxide in Earth's atmosphere, what will
happen to the average temperature on Earth?
Answer:
The average temp will increase
Explanation:
Carbon dioxide levels will cause global warming to increase and therefore the temp will increase
Hope this helps :)
How many moles is 17.6 g NaOH?
Answer: The answer is 39.99711.
Explanation:
How many grams NaOH in 1 mol? The answer is 39.99711.
We assume you are converting between grams NaOH and mole.
You can view more details on each measurement unit:
molecular weight of NaOH or mol
This compound is also known as Sodium Hydroxide.
The SI base unit for amount of substance is the mole.
1 grams NaOH is equal to 0.025001806380511 mole.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between grams NaOH and mole.
Type in your own numbers in the form to convert the units!
Convert another chemical substance
Convert grams
NaOH
to moles
Quick conversion chart of grams NaOH to mol
1 grams NaOH to mol = 0.025 mol
10 grams NaOH to mol = 0.25002 mol
20 grams NaOH to mol = 0.50004 mol
30 grams NaOH to mol = 0.75005 mol
40 grams NaOH to mol = 1.00007 mol
50 grams NaOH to mol = 1.25009 mol
100 grams NaOH to mol = 2.50018 mol
200 grams NaOH to mol = 5.00036 mol
 how are subscripts determine the formula of ionic and covalent compounds ?
Answer:
To determine the correct subscripts in a chemical formula, you have to solve how many atoms you need to balance the charge.
For example if I had the compound Calcium Fluoride I would look at the periodic table and see that Calcium's ionic formula is
Ca2+
. How do I know this? Well all elements want to have 8 valance electrons so they can be stable(happy). Seeing that Calcium has 2 valance electrons it is going to give away 2 electrons because that is easier than gaining 6 to be happy. Since Calcium has given away 2 electrons it has two more protons than electrons. We know that Protons have a Positive charge, Electrons have Negative charge, and the number of electrons is equal to the atomic number of an element in its pure non-ionic state. (Meaning it doesn't have a positive or negative charge; it is balanced.)
So if calcium gave away two electrons, it will have two more protons than an electron giving it a (2+) charge. The same process can be applied to Fluoride. Since fluoride is one to the left of the noble gases(group 18 or 8A) on the periodic table we know that it has 7 valance electrons because it is in group 7A or 17.
Knowing that we have 7 electrons the fluoride atom will gain an extra electron. Since the fluoride atom gained an extra electron it will have one more negative charge than a positive making it a ^(−)ion.
So you know that Calcium has a 2+ charge and that fluoride has a 1- charge, you then need these ions to balance out. So you need two fluorine atoms with a 1- ions to balance out the 2+ ion of calcium. Your final answer would be
CaF2
because you need two fluorine atoms to balance out the 2+ charge of the calcium.
Final Tip: Determine the charges then inverse the charges, remove the positive and negative superscipts, and write the charge numbers as a sub script. Ie. Calcium Fluoride
Ca2+ and F−
inversing and removing the charge signs would give you
determine the empirical and molecular formulas of a compound that gives the following analysis in math percent: 24.27% C,4.07% H, and 71.65%CL. the molar mass is known to be 197.92g/mol.
Answer:
help me with this
Explanation:
30. The density of an unknown gas at 27°C and 2 atm pressure is equal with density of N2 gas at
52°C and at 5 atm
pressure. Calculate the molar mass of that unknown gas.
pls help guys
Answer:
Molar mass of the unknown gas is 64.6 g/mol
Explanation:
Let's think this excersise with the Ideal Gases Law.
We start from the N₂. At STP conditions we know that 1 mol of anything occupies 22.4L.
We apply: P . V = n . R . T
5 atm . V = 1 mol . 0.082 . 325K
V = (1 mol . 0.082 . 325K) / 5 atm = 5.33 L
It is reasonable to say that, if we have more pressure, we may have less volume.
As this is the volume for 1 mol of N₂, our mass is 28 g. Then, the density of the nitrogen and the unknown gas is 28 g/5.33L = 5.25 g/L
Our unknown gas has, this density at 27°C and 2 atm.
If we star from this, again: 1 mol of any gas occupy 22.4L at STP, we can calculate the volume for 1 mol at those conditions:
P₁ . V₁ / T₁ = P₂ . V₂ / T₂
1 atm . 22,4L / 273K = 2 atm . V₂ / 300K
Remember that the value for T° is Absolute (T°C + 273)
[ (1 atm . 22.4L / 273K) . 300K] / 2 atm = V₂ → 12.3L
This is the volume for 1 mol of the unknown gas at 2 atm and 27°C
We use density to determine the mass: 12.3 L . 5.25 g/L = 64.6 g
That's the molar mass: 64.6 g/mol
The correct electron configuration is....
A)Electrons can go where they like.
B) Shell 1=2, Shell 2=8, Shell 3=8, Shell 4=18.
C) Shell 1-8, Shell 2=2, Shell 3=8, Shell 4=18
Answer:
C) Shell 1-8, Shell 2=2, Shell 3=8, Shell 4=18
which gas is used in flying balloons ?
Answer:
hydrogen
Explanation:
can i have brainliest please
How do plants and animals react to changing environments?
Which statement about the fossil record is correct?
Answer: most specimen that have lived on earth is still living here on earth
Explanation:
The statement correct about fossil record is option b. Extinction is rare a rare event and rarely seen in the fossil records.
What is fossil records?Fossils are the preserved remains of decomposed plants and animals. There are mainly two types of fossils namely , body fossils and trace fossils. Body fossils include bones, skull, and other body parts.
Trace fossils are traces of some actions of organisms that lived in earth. For example foot prints, caves, shells etc. The entire fossils—both known and unknown—along with their placement in strata and fossiliferous rock formations are collectively referred to as the fossil record.
The fossil record was one of the earliest data sources used to support the study of evolution and is still important for understanding the evolution of life on Earth. Geologists can now calculate the numerical or absolute age of different strata. It records extinction of some animals and plants as rare event.
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How many liters of oxygen (at STP) are required to form 10.5 grams of hydrogen
Answer:
You'd need 6.55 L of oxygen at STP to form that much water.
Explanation:
what is the electron dot structure of AsClBr2? Pls pls pls help me
Answer:
Explanation:
Sorry, I don't really know about this. I hope it helps!
Hot, molten rock deep below Earth’s surface is called lava mantle rock parent rock magma
Answer:
I think it is Magma
look at the four chemical reactions
reaction 1:4Na + O ▾ 2 -->2Na ▾ 2O
Reaction 2: 2NaCl—> 2Na+Cl ▾2
reaction 3: CaCO ▾3 —> CaO +CO ▾2
reaction 4: 2KCIO3 ▾3 —> 2KCI + 3O ▾2
which statement identifies the reaction that is different from the rest and explains correctly why it is different?
A.) Reaction 2, because two ions are interchanged
B.) Reaction 2, because two products are formed
C.) Reaction 1, because a single product is formed
D.) Reaction 1, because a single ion is replaced in a compound
Reaction 1 is the one that is different because there is only one product (option C).
In a reaction, there are two main components:
The reactants: Substances at the beginning of the reaction.The products: Substances at the end of the reaction.Moreover, a reaction can include two or more reactants as well as two or more products depending on the substances involved. Let's analyze reaction 1:
Reaction 1: 4Na + O2 → 2Na2OReactants: 4Na and O2Product: 2Na2OThis means in this reaction there is only one product. This does not occur in reactions 2, 3, and 4 because in these there are two products.
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If the initial temperature of a movable cylinder was 50 degrees Celsius
with a pressure of 2 ATM and an initial volume of 5 Liters,
what would the new volume be if the temperature was lowered to O
degrees Celsius and the pressure was reduced to 1 ATM?
Answer:
8.45 L
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T₁) = 50 °C
Initial pressure (P₁) = 2 atm
Initial volume (V₁) = 5 L
Final temperature (T₂) = 0 °C
Final pressure (P₂) = 1 atm
Final volume (V₂) =?
Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 50 °C
Initial temperature (T₁) = 50 °C + 273
Initial temperature (T₁) = 323 K
Final temperature (T₂) = 0 °C
Final temperature (T₂) = 0 °C + 273
Final temperature (T₂) = 273 K
Finally, we shall determine the new volume. This can be obtained as follow:
Initial temperature (T₁) = 323 K
Initial pressure (P₁) = 2 atm
Initial volume (V₁) = 5 L
Final temperature (T₂) = 273 k
Final pressure (P₂) = 1 atm
Final volume (V₂) =?
P₁V₁ / T₁ = P₂V₂ / T₂
2 × 5 / 323 = 1 × V₂ / 273
10 / 323 = V₂ / 273
Cross multiply
323 × V₂ = 10 × 273
323 × V₂ = 2730
Divide both side by 323
V₂ = 2730 / 323
V₂ = 8.45 L
Thus, the new volume is 8.45 L
What is the Lewis dot structure for calcium hydroxide
Answer:
Calcium hydroxide is formed by one Ca2+ cation and two OH− anions, which implies that its chemical formula will be Ca(OH)2.
Here's how you'd figure this out. If you look at the periodic table, you'll see that calcium is in group 2. That means that it has two valence electrons that it must give up in order to be stable.
On the other hand, oxygen is in group 6, which means it needs 2 electrons in order to be stable. It gets one electron from a hydrogen atom to form an OH− anion. Now it only needs one more electron, which it gets from the two calcium has to offer.
This means that you'd need two OH− groups to form calcium hydroxide, since each OH− group would get one electron from calcium → Ca(OH)2.
hope this helped
How will you describe the difference between heat and temperature?
Answer:
Heat: It is a form of internal energy* obtained because of the random motion and the attractive force of molecules within the substance.
Temperature: It is a quantity that determine which direction the heat energy will flow in.
Explanation:
Part I: Multiple Choice Questlons
1. A solution is a:
a heterogeneous mixture
C suspension
b homogeneous mixture
d colloid
Answer:
A cuz a heterogeneous mixture is no uniform
Answer:
A heterogeneous mixture
A bowling ball and basketball collide, what direction do they go and how is energy transferred?
Answer:
When the batter hits the ball, there is a force applied, and energy is transferred. The ball will move in the direction the force is pushing it. If two objects collide, energy will be transferred between both, and there will be a change in motion.
Explanation:
Why do you think it is necessary to break up the fat into tiny droplets?
How could you explain why soap is able to clean the oil and dirt off our bodies?
Answer:
for the first question, the context is necessary in order to answer...
Fat is immiscible (does not mix) with water because fat is nonpolar and water is polar (remember like dissolves like: polar mixes with polar, nonpolar with nonpolar).
soap bubbles by having many soap molecules surround fat molecules with their nonpolar end, and direct their polar ends outwards.
For your second question:
Dirt and oil are nonpolar. When we wash our bodies with water (which is polar) it does not do a good job in removing these nonpolar molecules. Soap, on the other hand, has a long nonpolar end and a small polar end. The nonpolar end of the soap molecule attaches to the dirt and oil on your skin and when the water from the shower head hits the soap, it pulls the dirt, oil, and soap off of you by attaching itself to the polar end of the soap molecule.
Explanation:
how is gas different from a liquid and a solid
a. a gas is mad of tiny particles
b. a gas has volume
c. a gas expands to fill the container
d. a gas has density
Answer:
a. a gas is mad of tiny particles
Explanation:
I believe
Explain why the pressure of a gas increases when its volume decreases.
HELP
Answer:
The gas pressure is raised by decreasing the volume of a gas. ... The particles can collide more often with the walls of the container because the volume has decreased. They exert force on them each time they collide with the walls. More collisions mean more force, so it will increase the strain.
hope this helped :)
The type of neuron that carries impulses from the brain are...
Describe why there are places on the curve where the temperature does not rise even though the burner is stil transferring energy to the ice and water.
Answer:
y
Explanation:
Which Kingdom does the organism belong to?
Animalia
Protista
Fungi
Plantae
pls help guys
How acidic buffer resist change in pH on addition of acid and base.
Answer:
Buffers are solutions that resist changes in pH, upon addition of small amounts of acid or base. The can do this because they contain an acidic component, HA, to neutralize OH- ions, and a basic component, A-, to neutralize H+ ions. Since Ka is a constant, the [H+] will depend directly on the ratio of [HA]/[A-].
hope it's help
#carryONlearningas a rollercoaster goes downhiQuestion 2 options:
kinetic energy is converted into potential energy
potential energy is converted into kinetic energy
electrical energy is converted into potential energy
potential energy is converted into electrical energy
ll
Answer:
b potential hope this is right
why are oxidation numbers assigned to the elements before writing a chemical formula
Answer:
Oxidation numbers assign ownership of the electrons to one atom or another in a compound. ... Scientists use these numbers to help name compounds, write formulas and balance chemical equations. They are also useful when studying reactions and they can help you identify when something is oxidized or reduced.
Oxygen and chlorine gas are mixed in a container with partial pressure of 401 mmHg and 0.639 atm Respectively. What is the total pressure inside the container?
Is seeing your breath in the cold air conduction, convection or radiation?
Answer:
convection cause it is vapor
Explanation:
Scientists are unable to research the organs, tissues, and cells of early organisms as these parts are rarely fossilized. Which is one reason for the lack of these fossilized parts?
Answer:
A. These parts quickly decompose.
Explanation: This is because organs are made of tissues that decompose more quickly than bone. Animals mainly eat the organs and tissues of another, not the bones. This results in quick destruction of these parts that are left behind.
Have a blessed day/night! Please mark brainliest if correct! <3
The reason for the lack of these fossilized parts is that these part quickly decompose. Hence option A is correct.
What is fossilization?Fossilization is defined as the mechanisms that are physical, chemical, and biological that result in the long-term preservation of plant and animal remnants. Fossilization is a negative representation of the creature preserved in the substrate as a fossil. Any preserved remains, impression, or trace of a once-living thing from a previous geological age is referred to as a fossil.
Decomposition is defined as the method through which decomposing organic matter yields more basic organic or inorganic elements . The process of recycling nutrients that have been consumed by an organism to create its body begins with decomposition. It is the process through which the dead tissues disintegrate and change into more basic organic forms.
Thus, the reason for the lack of these fossilized parts is that these part quickly decompose. Hence option A is correct.
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