Answer:
synthesis reaction
Explanation:
A + X --> AX
Answer:
Combustion reaction
Explanation:
What is depicted in a molecular formula?
Answer:
Molecular formula describes about number of atoms of each constituent element present in any molecule.
Explanation:
Molecular formula describe about the number and type of atoms in any molecule. A molecular formula is not a chemical name but instead it is a chemical formula of a compound. A molecular formula consist of chemical symbols for constituent elements followed by numeric subscripts which tells us about number of atoms of each element present in a molecule. For example : Ammonia is a compound of nitrogen and hydrogen i.e NH₃ . As there is only one N atom so we have written only N in it's molecular formula. But as there are 3-H atoms so we have written subscript 3 in H symbol in it's molecular formula. Molecular formula does not tell us anything about shape of molecule .
At about what temperature does the sample change phase? Justify your
answer based on the cooling curve shown above.
A student states, “When the alcohol sample was at a temperature of 500 K, all the particles were moving faster than any of the particles were moving at
400 K" Do you agree or disagree with this student's statement? Justify your
answer.
how does activation energy influence a reaction
Answer: The activation energy of a particular reaction determines the rate at which it will proceed. The higher the activation energy, the slower the chemical reaction will be. The example of iron rusting illustrates an inherently slow reaction.
Explanation:
You have about ______ liters of blood in your body.
A. picks up nutrients, water, and waste materials
B. pulmonary circulation
C. the lungs, where it picks up oxygen again
D. capillaries
E. 5
F. systemic circulation
Answer:
E
Explanation:
Density can be calculated by dividing an object's mass by its volume. If the mass of an object is 10 grams and its volume is 2 milliliters, what is its density?
Explanation:
mass =10g. volume=2ml. density=mass/volume = 10/2=5kg/m^3Answer:
5 g/mL
Explanation:
So, if the mass is 10 g and the volume is 2 mL, the density equals...
10 g ÷ 2 mL = 5 g/mL
In the morning, Rafael notices that the Sun appears on one side of the sky. In the evening, he notices that the Sun appears to be on the other side of the sky. However, in class, Rafael learned that the Sun does not actually move across the sky from one side to another.
Why does it appear that the Sun starts the day on one side of the sky and ends the day on the other?
A.
The Sun spins.
B.
The Earth has two Suns.
C.
The Sun moves around the Earth.
D.
The Earth spins.
Answer: The earth spins while we also rotate around the sun the sun is well to us still when actually in reality the whole galaxy is moving but our planet spins and with it comes to night and day.
Explanation:
Please help!! This would mean so much to me!!
Answer:
I think it's the A one. Hope it's correct
Answer:
A option is correct
Explanation:
Significant Figures
1. Indicate how many significant figures there are in cach of the following measured values.
un
246.32
5
1.008
700000
107.854
3
0.00340
3
350.670
4
100.3
14.600
1.0000
6
0.678
0.0001
320001
How many moles of butane (C4H10(g)) were combusted in the presence of excess
oxygen gas if 55.8 L of water vapour at STP is collected?
Moles of Butane combusted : 0.4982
Further explanationGiven
55.8 water vapour at STP
Required
moles of Butane
Solution
Reaction(Combustion of Butane) :
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
1 mol at STP = 22.4 L, so mol of H₂O for 55.8 L :
=55.8 : 22.4
=2.491 moles
mol H₂O based on Butane as a limiting reactant(excess Oxygen)
From the equation, mol ratio Butane-C₄H₁₀ : H₂O = 2 : 10, so mol Butane :
[tex]\tt =\dfrac{2}{10}\times 2.491\\\\=0.4982[/tex]
Can somebody plz help answer this question correctly thank you! ONLY 1-2 sentences is good thanks!
WILL MARK BRAINLIEST WHOEVER ANSWERS THIS QUESTION :DDD
to generate energy means to create energy. chemical energy is the energy that is created when you put effort into doing something..
when 45mL of 0.25mol/L sulfuric acid is mixed w/ 25mL of 0.58mol/L Calcium hydroxide, the solution has a?
(60 points + brain list)
Which is the configuration of an atom in the ground state?
A)
2-8-2
B)
2-6-1
C)
2-7-2
D)
2-7-3
Answer:
Ground state means when n = 1
and here the electronic configuration is 2:8:2
What type of
energy travels in the form of electromagnetic waves?
A: Chemical Energy
B: Gravitational Energy
C: Nuclear Energy
D: Radiant Energy
Answer:
Radiant Energy
Explanation:
Radiant energy is created through electromagnetic waves
Determine the number of seconds in one week.
Answer:
604,800 seconds in a week
Explanation:
86,400 seconds in a day
86,400 × 7 = 604,800
what the correct answer
Answer:
halogens
hope its right
Answer:
there combine with an acid called sodium chloride or magnesium sulphate
If the length, width, and height of a box are 9.50 cm, 6.75 cm and 3.50 cm, respectively, what is the volume of the box in units of milliliters and liters?
(a) How many mL will the box contain?
(b) How many L will the box contain?
Answer: 1cm³= 1mL
Explanation:
Why do longer wavelengths are considered to have lower frequencies? Make it as elaborate as possible. :D
Answer:
Longer wavelengths self means by it's name that the distance between the trough and crust are lesser than that of shorter wavelengths!
The word Lower frequency implies lower energy, thus light cannot easily penetrate the EM wave to excite electrons.
Examples of EM waves with longer wavelength :
Radiowaves, microwaves, etc..
a sample of an unknown metal has a mass of 21.6g and volume of an 8.00cm3 calculate the density of the unknown metal
Answer:
2.70 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{21.6}{8} \\ = 2.7[/tex]
We have the final answer as
2.70 g/cm³Hope this helps you
how long does it take for ink to dry
Which set of ordered pairs represents a function?
{(0, 1), (1, 3), (1, 5), (2, 8)}
{(0, 0), (1, 2), (2, 6), (2, 8)}
{(0, 0), (0, 2), (2, 0), (2, 4)}
{(0, 2), (1, 4), (2, 6), (3, 6
Can you please help me ASAP
Answer:
The Milky Way is a large barred spiral galaxy
Explanation: that has more than etc
Identify the following as a chemical (C) or physical property (P):
1. blue color ______
2. melting point ______
3. density ______
4. reacts with water ______
5. flammability (burns) ______
6. solubility (dissolves) ______
7. boiling point ______
8. luster ______
Answer: 1. Phys 2. Phys 3. Phys 4. Chem 5. Chem 6. Phys 7. Phys 8. Phys
Explanation:
According to the concept of physical and chemical property ,reaction with water and flammability are chemical properties while rest are physical properties.
What are chemical properties?These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.
These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.
The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.
Learn more about chemical properties,here:
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True or false When heat flows to an object, it can change states.
Answer: True
Explanation:
The matter exists as solid, liquid or gas. These are called the states of matter. The change of matter from one state to another can be achieved by heating or cooling.
The solid state can be converted into liquid state by providing heat to solid. The heat will make the particles move farther, resulting into liquid state.
Similarly when liquid state is provided heat, it changes to gaseous state. The heat will make the particles move much more faster.
Thus the statement that when heat flows to an object, it can change states is True.
What force pulled the solar system together out of a cloud of gas and dust
Please help
mg(oh)2
How many H atoms are there?
How many Mg?
What is the total number of atoms?
Answer:
There are 2 hydrogen atoms, one magnesium atom, and 5 atoms in total.
Explanation:
We are given a compound in formula form. To make things easier to understand, we can first convert this to the name of the compound.
When a compound contains one or more elements in parentheses, these are usually a polyatomic ion. Polyatomic ions are ions made up of two or more elements with a positive or negative charge over the entire ion. Commons examples of these NH₄⁺ (ammonia) and HCO₃⁻ (bicarbonate). You can combine metals with polyatomic ions to create commonly known compounds, such as baking soda. The chemical name for baking soda is sodium bicarbonate, so we can combine Na (sodium) with HCO₃⁻ (bicarbonate) and create sodium bicarbonate: NaHCO₃.This compound is one magnesium atom bonded to two hydroxide ions.
Hydroxide is the compound between one hydrogen atom and one oxygen atom. The compound overall adopts a negative charge of 1.If we have one hydrogen atom and one oxygen atom, the most electronegative atom is written first in chemical formulas. Therefore, the symbol for Oxygen (O) goes first.Then, write in the hydrogen atom directly after the O symbol: OH.Finally, since we have a negative charge on the ion, we need to play a negative sign as a superscript for the compound. Therefore, this becomes OH⁻.Now, we need to determine the charge on the Magnesium atom which is determined from the amount of valence electrons the atom has.
On a periodic table, the symbol for Magnesium is Mg and this element has 2 valence electrons. In order to fulfill the Octet Rule, the It is more likely to give up 2 electrons to a nonmetal than it is to gain 6, so we can safely assume that the charge is ²⁺.We need to use the criss-cross technique to transfer the charges between the element and the ion, so the negative 1 charge goes to the Mg, which does not appear (negative 1 or positive 1 are implied) and since the magnesium has a charge of positive 2, this is the subscript for the hydroxide ion.Therefore, our compound becomes Mg(OH)₂, and we have labeled this as magnesium hydroxide.Now, to the number of atoms:
The new charge on Mg is 1-, so there is only one atom of Mg.The charge is 2+ on the OH ion, so there are two atoms of H and two atoms of O.Two atoms of oxygen, two atoms of hydrogen, and one atom of magnesium add up to be five atoms in total.find the percent composition of lead in lead (II) nitrate. round to 2 significant figures.
Answer/Explanation:
62.559%
mass of an element X 100%
mass of the compound
Scientific Notation: 3.45 x 10^5
E Notation: 3.45e5
What's wrong with the statement "a mug of hot chocolate contains more heat than a glass of cold water."
Answer:
Heat is not something that can be contained since it is not a tangible thing. Heat is a process
Explanation:
The wrong thing in this statement "a mug of hot chocolate contains more heat than a glass of cold water."is: Heat is a process. Heat is not something that can be contained since it is not a tangible thing.
What is Heat ?Heat can be defined as a state or quality of being hot or in a high temperature.
Heat can also be said to be a transfer of kinetic energy from one environment to another, from one medium to another, or from one object to another.
In conclusion, Heat is a process. Heat is not something that can be contained since it is not a tangible thing.
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explain with example the combination and decomposition reaction.
Answer:
Decomposition reactions require an input of some form of energy. For example, under the influence of an electric field, water breaks down to give hydrogen and oxygen. In the presence of sunlight, hydrogen peroxide decomposes into oxygen and water.
DUE TOMORROW!!! 15 POINTS
please help!! the answers are already given i just need to show work :( ive been stuck on this for an hour now
Answer:
A. write balanced chemical equation (including states), for this process.
Explanation:
Almost all hydrocarbon 'burn' reactions involve oxygen; it's by far the most reactive substance in air.
Hydrocarbon combustions always involve
[some hydrocarbon] + oxygen --> carbon dioxide + steam.
C6H6(l) + O2 (g)--> CO2 (g)+ H2O (g)
Balance carbon, six on each side:
C6H6(l) + O2 (g)--> 6CO2 (g)+ H2O (g)
Balance hydrogen, six on each side:
C6H6(l) + O2 (g)--> 6CO2(g) + 3H2O (g)
Now, we have fifteen oxygens on the right and O2 on the left.
Two ways to deal with that. We can use a fraction:
C6H6 (l)+ (15/2)O2 (g)--> 6CO2 (g)+ 3H2O (g)
Or, if you prefer to have whole number coefficients, double everything
to get rid of the fraction:
2C6H6 (l)+ 15O2 (g)--> 12CO2 (g)+ 6H2O (g)
With the SATP states thrown in...
C6H6(l) + (15/2)O2(g) --> 6CO2(g) + 3H2O(g)
which rock is the result of changes on the Earth's surface?
igneous rock
sedimentary rock
metamorphic rock
Answer:
metamorphic
Explanation:
when one rock changes another rock the rock that got changed is now metamorphic