Answer:
Explanation:
water has greater density than ice. so true
8. FOR BRAINLIST!!!
Genetic variation describes naturally occurring differences among individuals within
the same population or species. It is based on the differences in the alleles in the
gene pool in a population. These differences--
I think it's either b or c
For the titration of 50.0 mL of .020M HI with 0.015 M of NaOH, graph pH versus milliliters of base added from 0-100 mL. How many milliliters of NaOH are added at the equivalence point?
Answer:
[tex]V_{base}=66.7mL[/tex]
Explanation:
Hello there!
In this case, since the neutralization reaction between HI and NaOH is:
[tex]NaOH+HI\rightarrow NaI+H_2O[/tex]
Thus, as there is a 1:1 mole ratio of base to acid, it is possible to use the following mole equivalence:
[tex]n_{base}=n_{acid}\\\\M_{base}V_{base}=M_{acid}V_{acid}[/tex]
Thus, by solving for the volume of base, we obtain:
[tex]V_{base}=\frac{M_{acid}V_{acid}}{M_{base}}[/tex]
Therefore, we plug in the given data to obtain:
[tex]V_{base}=\frac{0.020M*50.0mL}{0.015M}\\\\ V_{base}=66.7mL[/tex]
Best regards!
What differences would you expect if, at the same time, you place yellow and blue food coloring in both HOT and COLD water?
Answer:
The food coloring in the hot water will most likely spread faster than the one in the cold in which can result in it turning green rather than the coloring in the cold.
Explanation:
The following table lists the speed of sound in various materials. Use this table to answer the question.
Substance Speed (m/s)
Glass 5,200
Aluminum 5,100
Iron 4,500
Copper 3,500
Salt water 1,530
Fresh water 1,500
Mercury 1,400
Hydrogen at 0°C 1,284
Ethyl Alcohol 1,125
Helium at 0°C 965
Air at 100°C 387
Air at 0°C 331
Oxygen at 0°C 316
Sound travels fastest in _____.
solids
liquids
cold gases
warm gases
Sound travels fastest through solids.
it would be cold gasses because of how air at 0 is faster then at 100
A solution of zinc nitrate is added to a solution of sodium carbonate.
Answer:
Zinc Carbonate
Sodium Nitrate
is it good to use alcl on the icy roads?
Classify each of the following as an element, a compound,or a mixture, copper,water, nitrogen,and sulfur
Answer: copper, nitrogen,and sulfur : element
water : compound
Explanation:
Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions. Example: Sulphur (S), copper (Cu), Nitrogen (N).
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water [tex](H_2O)[/tex]
How do I get a guy to like me?
Answer:
ummmmmmmmmm awwwwwwww u don't need anyone if that's what u mean
us single pringles need to stick together
Answer:
be yourself and just be yourself
Explanation:
Hope this helps and have a nice day:)
17.5 mL of 0.1000M NaOH was required to neutralize 25.0 mL of HCl. What was the molarity of the HCl?
Answer: The molarity of [tex]HCl[/tex] is 0.07 M
Explanation:
According to the neutralization law,
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1[/tex] = basicity [tex]HCl[/tex] = 1
[tex]M_1[/tex] = molarity of [tex]HCl[/tex] solution = ?
[tex]V_1[/tex] = volume of [tex]HCl[/tex] solution = 25.0 ml
[tex]n_2[/tex] = acidity of [tex]NaOH[/tex] = 1
[tex]M_1[/tex] = molarity of [tex]NaOH[/tex] solution = 0.1000 M
[tex]V_1[/tex] = volume of [tex]NaOH[/tex] solution = 17.5 ml
Putting in the values we get:
[tex]1\times M_1\times 25.0=1\times 0.1000\times 17.5[/tex]
[tex]M_1=0.07M[/tex]
Therefore, molarity of [tex]HCl[/tex] is 0.07 M
What's the partial pressure of carbon dioxide in a container that holds .35 atm of nitrogen, and .12 atm of hydrogen and has a total pressure of 1.05 atm
Answer:
0.58 atm
Explanation:
Step 1: Given data
Total pressure of the gaseous mixture (P): 1.05 atmPartial pressure of N₂ (pN₂): 0.35 atmPartial pressure of H₂ (pH₂): 0.12 atmPartial pressure of CO₂ (pCO₂): ?Step 2: Calculate the partial pressure of CO₂
The total pressure of the gaseous mixture is equal to the sum of the partial pressures of the individual gases.
P = pN₂ + pO₂ + pCO₂
pCO₂ = P - pN₂ - pO₂
pCO₂ = 1.05 atm - 0.35 atm - 0.12 atm = 0.58 atm
What is uranium classified as
Akali Metals, Akaline Metals, Metalloids, Halogen, Noble Gas, Transition Metal, Rare Earth Metal or Non-Metal?
SOMEONE PLEASE HELP I NEED THIS NOW PLEASE JUST THIS ONE QUESTION I DON’T KNOW
Answer:
uranium is classifide as actinide a chemical element atomic number 92 and is a solid at room temperature
Describe technologies used to explore the universe using electromagnetic radiation.
Answer:
Electromagnetic spectrum
Explanation:
Telescopes are used by observers to monitor various electromagnetic radiation. Only one component of the visible radiation can be observed by each type of instrument. Telescopes, ultraviolet telescopes, optical celestial objects, and other types of telescopes are available.
i need halp with this one
Pangea was formed in the Paleozoic Era
Which is not synthetic polymer?
a) Teflon
b) PVC
c) Chitin
The chemical equation, 2 Cr + 3 Fe(NO3)2 - 3 Fe + 2 Cr(NO3)3, is an
example of which type of reaction?*
Answer:
Single replacement reaction (aka single displacement reaction)
Explanation:
In a single replacement reaction, one element is substituted for another in a compound to create a new compound and a new element in the products. The general form is:
A + BC --> B + AC
In the case of this question, Cr and Fe "trade places."
What type of reaction is shown below?
A. hydration reaction
B.addition reaction
Why are the relative and absolute ages of fossils important to scientists?
Answer Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in. ... Relative dating places events or rocks in their chronologic sequence or order of occurrence. Absolute dating places events or rocks at a specific time.: Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.With absolute age dating, scientists determine the absolute age of a rock in millions of years before present rather than just the age of the rock relative to the rock units around it. This information helps geologists develop more precise geological history models for the rocks and regions they study.
hope this helps u have a nice night❤️
Explanation:
What is the concentration of chlorine in ppm, in a 2.0L sample of pool water that contains 5.2mg of chlorine. How do I do this problem
Answer: 2.6 ppm
Explanation: ppm is parts per million, also 1:1000 000.
It means 1 mg in 1000 000 mg is same as 1 mg in 1000 g
Assume 2.0 litres weighs 2.0 kg = 2000 g
In one litre there is 2.6 mg Cl. You get a proportion 2.6 mg :1000 g
The concentration of chlorine is 2.6 ppm.
What is concentration?Concentration can be calculated in terms of Parts per million, or ppm, that is a measurement of dissolved solids in solution expressed as a ratio of the count of parts of solids/solute to one million parts of total volume.
The concentration can be calculated by using the formula:
C = m / v
where, C is concentration, m is mass and v is volume.
Calculation of concentration is shown as:
By using the formula, C = m / v
Put the values of m = 5.2 mg and v = 2 L in concentration formula.
C = 5.2 mg / 2 L
C = 2.6 ppm
Therefore, the concentration of solution will be 2.6 ppm.
To know more about concentration click here.
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A chemist working for Udensi industries wants to create a new ink for tattoos and cosmetics. Determine the theoretical yield of iron (ll) sulfide if the chemist uses 22.5 grams of iron ? Type of rxn : AD , SR, DR , D Type of calculation : mol to mol ; mol to mass ; mass to mols mass to mass Fe S8--> Fes
Answer:
35.36 g
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
8Fe + S₈ —> 8FeS
Next, we shall determine the mass of Fe that reacted and the mass of FeS produced from the balanced equation. This can be obtained as follow:
Molar mass of Fe = 56 g/mol
Mass of Fe from the balanced equation = 8 × 56 = 448 g
Molar mass of FeS = 56 + 32 = 88 g/mol
Mass of FeS from the balanced equation = 8 × 88 = 704 g
SUMMARY:
From the balanced equation above,
448 g of Fe reacted to produce 704 g of FeS.
Finally, we shall determine the theoretical yield of FeS as follow:
From the balanced equation above,
448 g of Fe reacted to produce 704 g of FeS.
Therefore, 22.5 g of Fe will react to produce = (22.5 × 704)/448 = 35.36 g of FeS.
Thus, the theoretical yield of FeS is 35.36 g
How many atoms are in 294 g of copper?
Answer
2.1 x 10 ^23
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if a runner decreases his velocity from +20 m/s to +10 m/s what is his average acceleration
Answer:
f a runner decreases his velocity from +20 m/s to +10 m/s, with average acceleration is -5m/s².
Explanation:
Identify the group number in the periodic table of X, a representative element, in each of the following ionic compounds:
Al2X3
XCO3
and an explanation on how you did it. I want to understand how to do this in the future :')
In the formation of ionic compound, atoms of different elements that have obtained a nonneutral electrical charge (either due to losing or gaining electrons, creating a charge imbalance between the negatively-charged electrons and the positively-charged protons) are attracted in such a way that their interaction would result in electrical neutrality. Group 4A elements (the "carbon group") are a sort of dividing line: Elements in groups to the left of group 4A (the metallic elements) tend to have atoms that lose electrons during ionization, thus becoming more positive; elements in groups to the right of group 4A (the nonmetallic elements) tend to have atoms that gain electrons during ionization, thus becoming more negative. This is, of course, a broad generalization, but it should suffice in helping to get a big-picture idea of how to approach binary ionic compounds such as Al2X3.
Al, or aluminum, is a metallic element in group 3A, which is to the left of group 4A. A neutral aluminum atom has three valence electrons in its outermost shell. When an aluminum atom loses these three valence electrons (thus gaining a stable, noble gas electron configuration), it becomes a positively-charged aluminum ion, Al³⁺.
Now, let's consider how this aluminum cation (a positively-charged ion) could interact with anions (negatively-charged ions) to form an electrically-neutral compound. The most straightforward interaction would be an ionic bond between Al³⁺ and X³⁻. Why? Because the charges between the one Al³⁺ cation and the one X³⁻ anion are opposite and equal in magnitude; they would thus bond in a 1:1 unit ratio to form an ionic compound with the formula AlX.
But that's not what we have here! In our ionic compound, the Al has a subscript of 2, and the X has a subscript of 3. Here's the trick with ionic compounds: Assuming that our subscripts are all simplified to the lowest whole number, an ion's charge is equivalent in magnitude to the counterion's subscript (the counterion is simply the oppositely-charged ion in a binary ionic compound). The sign of the charge will be positive for the metal ion (which conventionally comes first in the formula unit) and negative for the nonmetal ion. The subscript of X is 3 in Al₂X₃, so the charge number on the Al ion is 3. Al, a metal, forms a positively-charged ion; thus, the Al ion has a 3+ charge.
Let's do the same for X. Al has a subscript of 2, so when the X atom ionizes, its charge must have a number of 2 and be negative, i.e., a 2- charge. Conveniently, the charge on an ion of a main-group and non-transition metal element tells us which group that ion's element is in. That's because the group number of elements in the s- and p-blocks is equal to the number of valence electrons in a neutral atom in that group. A group 1A element's atom has one valence electron; a group 2A element's atom has two valence electrons; and a group 3A element's atom (like an Al atom) has three valence electrons; and so forth.
An ion gains or loses electrons so that its outermost (valence) shell is completely filled. If element X's ion exists in the X²⁻ state, then that means it takes the addition of two electrons to give the X atom a full octet (eight electrons in the valence shell). We can then conclude that a neutral atom of X must have six valence electrons since 8 - 2 = 6. Thus, X is an element in group 6A (or group 16 on the extended periodic table), the chalcogens or "oxygen family."
Indeed, the most common form of the compound aluminum oxide has the formula Al₂O₃. Aluminum also forms an ionic compound with sulfur—another group 6A element—which has the formula Al₂S₃.
---
For XCO3, we must keep in mind that CO₃ as a whole is the counterion to X. The 3 is not the subscript for the CO₃ ion. CO₃, or carbonate, has a 2- charge: it can be written as (CO₃)²⁻. Here, the CO₃ ion as a group has no subscript, which might lead one to think that X must be an element from group 1A. Not so fast! It's critical to know beforehand that the carbonate ion has a 2- charge; if X were indeed a group 1A element, X would have a subscript of 2. But X has no subscript (a subscript of 1). Since the subscripts of ionic compounds are simplified to their lowest whole number ratios, that means that X must have a subscript of 2. Only then would both the subscripts of X and CO₃ be simplified to 1, as we have here. If CO₃ has a subscript of 2, that means that X is an element in group 2A (or group 2), the alkaline earth metals.
Indeed, the group 2A elemental ions magnesium (Mg²⁺) and calcium (Ca²⁺) both ionically bond with the carbonate ion to form magnesium carbonate and calcium carbonate, respectively; their respective formulae are MgCO3 and CaCO3, the same form as XCO3.
how many atoms are in 4.90 mol of Al2O3
Answer:
12 g of 12C to three significant figures maybe?
Explanation:
tell if correct or not im sorry fi it isnt :c
How many grams are in 3.80 mol of sodium chloride (NaCl)?
Express your answer numerically in grams.
Windvailable Hintis
Answer:
weight = moles x molecular weight = 3.80 x 58.44 = 222.07 g
Explanation:
If you put a plant across the room from a window, how will this affect the growth of the plant?
The plant will grow away from the light source.
The plant will grow toward the light source.
The plant will grow faster.
The plant will stop growing,
Write the chemical equation of the reaction in which the reactants are nitrogen (N2) and hydrogen (H2) and the product is ammonia (NH3)! ___ + ___ ---> ___
Answer:
We’re asked to write the balanced chemical equation for the reaction of N2 and O2 based on the given diagram.
Recall that when balancing chemical equations, we have to make sure that the number of elements on both sides is equal with the lowest whole number coefficients.
The reactants are:
3 moles N2 (blue)
9 moles H2 (white)
The equation for the reaction can be written as:
N2 + H2 → NH3 (not balanced)
Which item is necessary to make an electromagnet?
What is a homologous structure that humans share with other vertebrates when they are fully grown?
hair
gills
spine
tail
Answer:
spine
Explanation:
The reaction 2KClO3(s) --> 2KCl(s) + 3O2(g) is a(n)
Group of answer choices
combustion reaction.
ionic reaction.
synthesis reaction.
decomposition reaction.
Answer:
decomposition reaction.
Explanation:
It is a decomposition reaction as potassium chlorate compound breaks to form potassium chloride and oxygen. This reaction requires heat as source of energy to break down the compound so it is endothermic in nature.
Compare and contrast the behavior of the food coloring and the floating pieces of paper before and after adding heat to the system. What caused the changes you observed
Answer:
the answer is c
Explanation:
Answer:
Im doing this rn :0, look at explanation ill try to help
Use different words
Have a great day!
pls give brainliest and hit the heart if this helped :3
Explanation:
The changes I observed are that when you do not use hot water, the food coloring stays at the bottom and doesn't spread to the top, but when I do use food coloring, it spreads everywhere in the water. I don't know what caused the changes I observed, but I think its because heating food coloring does something to it to make it spread, maybe hotter liquids spread faster?