I don't understand with the question number 4, does anybody understand how to do it?
Answer:
iodine = I
sodium= Na
oxygen= O2
aluminum = AI
nitrogen=N
sulfur= S
bromine =Br
magnesium =Mg
Which type of changes are melting, freezing, and boiling?
Answer:
the changes are physical changes
Define An Atom.
Ty!!!
=> the smallest particle of a chemical element that can exist.
-------☆ﾟ.･｡ﾟᵴɒƙυᴚᴀ_ƨȶäᴎ❀
7. Which type of electromagnetic radiation can be dangerous to living things?
a. Radio waves
b. Visible light
c. Gamma rays
When you mix water and salt you get a.
What can you say about the forces between the particles of these gases)
Answer:
Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles.
Explanation:hopes this helps:)
7. Which structural formula correctly represents a hydrocarbon molecule?
Answer:
the 4th one is the corrent one
A compound contains 1.2 g of carbon, 3.2 g of oxygen and 0.2g of hydrogen. Find the formula of the compound
Answer:
The empirical formula of the compound is [tex]C_{0.504}HO_{1.008}[/tex].
Explanation:
We need to determine the empirical formula in its simplest form, where hydrogen ([tex]H[/tex]) is scaled up to a mole, since it has the molar mass, and both carbon ([tex]C[/tex]) and oxygen ([tex]O[/tex]) are also scaled up in the same magnitude. The empirical formula is of the form:
[tex]C_{x}HO_{y}[/tex]
Where [tex]x[/tex], [tex]y[/tex] are the number of moles of the carbon and oxygen, respectively.
The scale factor ([tex]r[/tex]), no unit, is calculated by the following formula:
[tex]r = \frac{M_{H}}{m_{H}}[/tex] (1)
Where:
[tex]m_{H}[/tex] - Mass of hydrogen, in grams.
[tex]M_{H}[/tex] - Molar mass of hydrogen, in grams per mole.
If we know that [tex]M_{H} = 1.008\,\frac{g}{mol}[/tex] and [tex]m_{H} = 0.2\,g[/tex], then the scale factor is:
[tex]r = \frac{1.008}{0.2}[/tex]
[tex]r = 5.04[/tex]
The molar masses of carbon ([tex]M_{C}[/tex]) and oxygen ([tex]M_{O}[/tex]) are [tex]12.011\,\frac{g}{mol}[/tex] and [tex]15.999\,\frac{g}{mol}[/tex], then, the respective numbers of moles are: ([tex]r = 5.04[/tex], [tex]m_{C} = 1.2\,g[/tex], [tex]m_{O} = 3.2\,g[/tex])
Carbon
[tex]n_{C} = \frac{r\cdot m_{C}}{M_{C}}[/tex] (2)
[tex]n_{C} = \frac{(5.04)\cdot (1.2\,g)}{12.011\,\frac{g}{mol} }[/tex]
[tex]n_{C} = 0.504\,moles[/tex]
Oxygen
[tex]n_{O} = \frac{r\cdot m_{O}}{M_{O}}[/tex] (3)
[tex]n_{O} = \frac{(5.04)\cdot (3.2\,g)}{15.999\,\frac{g}{mol} }[/tex]
[tex]n_{O} = 1.008\,moles[/tex]
Hence, the empirical formula of the compound is [tex]C_{0.504}HO_{1.008}[/tex].
Whch is more acidic, a solution with a pH of 2 or 5
Answer:
A solution with a pH of 2
Explanation:
The lower a pH is in a liquid, the more acidic it is. 7 is the neutral pH for a liquid. We usually drink around that pH for water. A pH higher than 7 expresses that the liquid is a base.
Answer:
A solution with a pH of 2 is more acidic.
Explanation:
The solution with a pH of 2 is more acidic because on the pH scale as you get closer to zero, the more acidic the solution becomes.
what does molecule mean?
a.) A pure substance, only one type of atom
b.) Two or more atoms held together by chemical bonds
c.)Composed of two or more separate elements
d.)The smallest part of matter still retaining chemical properties
A pure substance, only one type of atom
Answer:
(a) a pure substance, only one type of atom
What is the number of moles of Sodium Chloride (NaCl) that is present in 29.22g sample of it?
Answer:
[tex]\boxed {\boxed {\sf 0.5000 \ mol \ NaCl}}[/tex]
Explanation:
We are asked to convert grams to moles. We must use the molar mass or the grams in 1 mole of a substance. These values are found on the Periodic Table as the atomic mass, but the units are grams per mole (g/mol) instead of atomic mass units (amu).
We are given the compound sodium chloride or NaCl. Look up the molar masses of the individual elements.
Na: 22.9897693 g/mol Cl: 35.45 g/molThe formula for the compound does not contain any subscripts, so there is 1 mole of each element in 1 mole of the compound. Add the molar masses together to find sodium chloride's molar mass.
NaCl: 22.9897693 + 35.45= 58.4397693 g/molNow we can use the molar mass to create a ratio. We know there are 58.4397693 grams of NaCl in 1 mole of NaCl.
[tex]\frac {58.4397693 \ g \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Multiply by the number of grams provided in the problem: 29.22
[tex]29.22 \ g\ NaCl*\frac {58.4397693 \ g \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Flip the ratio so the units of grams of NaCl cancel.
[tex]29.22 \ g\ NaCl*\frac { 1 \ mol \ NaCl}{58.4397693 \ g \ NaCl}[/tex]
[tex]29.22*\frac { 1 \ mol \ NaCl}{58.4397693}[/tex]
[tex]\frac {29.22}{58.4397693} \ mol \ NaCl[/tex]
[tex]0.5000019738 \ mol \ NaCl[/tex]
The original measurement of grams has 4 significant figures, so our answer must have the same. For our answer, that is the ten-thousandth place. The 0 to the right of this place (0.5000019738) tells us to leave the 0 in the ten-thousandth place.
[tex]0.5000 \ mol \ NaCl[/tex]
There are approximately 0.5000 moles of sodium chloride in a 29.22 gram sample of sodium chloride.
PLESE HELP WILL GIVE BRAINLYESTY
Imagine that you are Francis Bacon. Write a short autobiographical statement that talks about who you are, where you’re from, and some of your important contributions.
Answer:
My name is Francis Bacon I am a English philosopher and statesman. i was born on January 22, 1561, at York House off the Strand, London. Today, Bacon is still widely regarded as a major figure in scientific methodology and natural philosophy during the English Renaissance. Having advocated an organized system of obtaining knowledge with a humanitarian goal in mind, he is largely credited with ushering in the new early modern era of human understanding.
Explanation:
Mark drove 14 miles EAST and then 23 miles WEST. His displacement from where he started would be
Answer:
9 miles west
Explanation:
hope this helps
In 2Fe+3Cl2=2FeCl3, how much iron (Fe) is needed to produce 4 moles of FeCl3?
In 2Fe+3Cl2=2FeCl3, how much FeCl3 is produced when 5 moles of Fe react in excess chlorine?
Answer:
4 mol Fe
5 mol FeCl₃
Explanation:
Step 1: Write the balanced equation
2 Fe + 3 Cl₂ ⇒ 2 FeCl₃
Step 2: Calculate how much iron (Fe) is needed to produce 4 moles of FeCl₃
According to the balanced equation, the molar ratio of Fe to FeCl₃ is 2:2.
4 mol FeCl₃ × 2 mol Fe/2 mol FeCl₃ = 4 mol Fe
Step 3: Calculate how much FeCl₃ is produced when 5 moles of Fe react in excess chlorine
According to the balanced equation, the molar ratio of Fe to FeCl₃ is 2:2.
5 mol Fe × 2 mol FeCl₃/2 mol Fe = 5 mol FeCl₃
How many moles are in 2.8x10^24 atoms of silicon?
Answer:
4.6 mol Si
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
[Given] 2.8 × 10²⁴ atoms Si
[Solve] moles Si
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 2.8 \cdot 10^{24} \ atoms \ Si(\frac{1 \ mol \ Si}{6.022 \cdot 10^{23} \ atoms \ Si})[/tex][DA] Divide [Cancel like units]: [tex]\displaystyle 4.64962 \ mol \ Si[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
4.64962 mol Si ≈ 4.6 mol Si
Which of the following can be used to measure an object's
speed?
Answer:
distance traveled divided by the time it traveled
Explanation
this is just an equation for how to find speed. you can also just use like a meterstick and a stopwatch
PLEASE HELP QUICKLY!!
I know it's not A or B; I just can't figure it out between C and D.
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What will most likely happen when a component is added to a reaction system at equilibrium?
A. The system will be unaffected by stress.
B. The addition of a catalyst will change the equilibrium.
C. The equilibrium position will shift away from what was added to lower its concentration.
D. The equilibrium position will shift away from what was added to increase its concentration.
Answer:
c: The equilibrium position will shift away from what was added to lower its concentration.
Explanation:
Answer: C. The equilibrium position will shift away from what was added to lower its concentration.
Explanation:
If we have a system that is already in equilibrium, the addition of an extra amount of one of the reactants or one of the products throws the system out of equilibrium. Either the forward or the reverse reaction will then occur to restore equilibrium conditions.
Add coefficients to balance the equation to make water.
H2(g) +O2 (g)H20 (1)
Answer:
2H2+2O2=2H2O
Explanation:
hope this helps
The name for the process that causes fertile land to become dirt-like is??
Deforestation
Urbanization
Construction
Desertification
Answer:
Desertification?
Explanation:
Desertification is when fertile lands become desert like
whoever answeres all the questions will get brainliest question
question 1
why is steel not a mineral?
A. is it man-made
B. is it alive
c. is it found in nature
d. is it strong
question 2
which mineral is used to make pencils?
A. diamond
B. jade
c. graphite
d. calcite
question 3
wich mineral is used to make glass
A. emerald
b. quartz
c.copper
D. halite
question 4
wich mineral do we eat
A. silver
b. jade
c. quartz
d.halite
question 4 _____ is the hardest mineral and ____ is the softest
A. quartz, graphite
B. silver, gold
C. diamond , talc
d. halite, calcite
question 5
what is minerals streak
A. the color minerals streak
b. how much the mineral weighs
c. the shape of crystals
d. the color left behind when a mineral is
scraped on porcelain tile
question
question 6
all minerals break at the same time
a. true
b. false
Answer:
1. A
2. C
3. B
4. D
5. D
6. B
Explanation:
I'm not quiet sure on 5 but I'm pretty sure its correct
HURRY PLEASE
What volume is occupied by 3.12 moles of a gas when the pressure is 88.4 kPa at a temperature of 19℃?
Answer:
The Combined Gas Law shows that the pressure of a gas is inversely proportional to volume and directly proportional to temperature. Avogadro's Law shows that volume or pressure is directly proportional to the number of moles of gas. Putting these together leaves us with the following equation:
P1×V1T1×n1=P2×V2T2×n2(11.9.1)
As with the other gas laws, we can also say that (P×V)(T×n) is equal to a constant. The constant can be evaluated provided that the gas being described is considered to be ideal.
The Ideal Gas Law is a single equation which relates the pressure, volume, temperature, and number of moles of an ideal gas. If we substitute in the variable R for the constant, the equation becomes:
P×VT×n=R(11.9.2)
The Ideal Gas Law is conveniently rearranged to look this way, with the multiplication signs omitted:
PV=nRT(11.9.3)
The variable R in the equation is called the ideal gas constant.
Explanation:
A sample of helium has a volume of 3.49 L at 741 mmHg. What would be the volume if the pressure
were changed to 760 mmHg at the same temperature?
show work
P1: 741 mmHg
V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L
P2: 760 mmHg
V2: ? L
What are the only types of metals that be magnetized?
the 3 factors that affect the process of Natural Selection
Answer:
Overproduction of Offspring. The first of these factors that must be present in order for Natural Selection to occur is the ability of a population to overproduce offspring.
Variation.
Selection.
Reproduction of Adaptations.
Explanation:
What is the molarity of a solution made of 2.45 moles of LiCl in 4.75 L of solution?
Answer:
.52 M
Explanation:
moles ÷ liters = molarity
2.45 ÷ 4.75 = 0.5157894737
rounding it = .52
why is Cu+O=2CuO unbalanced
Answer:
because the product of CuO contains 2 molecules so it is unbalanced
Explanation:
to balance it 2Cu+2O=4CuO now it is balanced
Can someone help me with these answers please I’ll give Brainly !!!!
1.What's the first thought that comes to mind when you hear "nuclear"? nuclear, that's the word. well the first thing that comes into everyone's mind in nuclear and they have to think it then think of words that associate with it.
2.the most important point of something.
3.test site
4.
what method is used to separate smoke particles from air
What is concentration if pOH is 8?
A) 1 x 10-8 M
B) 1 x 102 M
C) 1 x 10-2M
D) 1 x 108 M
The answer is A) 1 x 10-8 M.
When a solute is added to water, the boiling point
Answer:
Boiling-point elevation describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent. This happens whenever a non-volatile solute, such as a salt, is added to a pure solvent, such as water.