Answer:
Explanation:
.
How many moles is 287.7 grams of Iridium (Ir)?
1.497 mol Ir
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
287.7 g Ir
Step 2: Identify Conversions
[PT] Molar Mass of Ir - 192.22 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 287.7 \ g \ Ir(\frac{1 \ mol \ Ir}{192.22 \ g \ Ir})[/tex]Multiply/Divide: [tex]\displaystyle 1.49672 \ mol \ Ir[/tex]Step 4: Check
Follow sig fig rules and round. We are given 4 sig figs.
1.49672 mol Ir ≈ 1.497 mol Ir
Answer:
[tex]\boxed {\boxed {\sf About \ 1.497 \ mol \ Ir }}[/tex]
Explanation:
To convert from grams to moles, we must the molar mass of iridium, which can be found on the Periodic Table.
Ir: 192.22 g/molUse the molar mass as a ratio.
[tex]\frac{ 192.22 \ g \ Ir}{ 1 \ mol \ Ir}[/tex]
Multiply by the given number of grams: 287.7
[tex]287.7 \ g Ir *\frac{ 192.22 \ g \ Ir}{ 1 \ mol \ Ir}[/tex]
Flip the fraction so the grams of Iridium will cancel.
[tex]287.7 \ g Ir *\frac{1 \ mol \ Ir }{ 192.22 \ g \ Ir}[/tex]
[tex]287.7 *\frac{1 \ mol \ Ir }{ 192.22 }[/tex]
[tex]\frac {287.7 \ mol \ Ir }{192.22} \\[/tex]
Divide.
[tex]1.49672251 \ mol \ Ir[/tex]
The original measurement has 4 significant figures, so we must round our answer to 4 sig figs as well. For the answer we calculated, that is the thousandth place.
The 7 in the ten thousandth place tells us to round the 6 up to a 7.
[tex]1.497 \ mol \ Ir[/tex]
There are about 1.497 moles of iridium in 287.7 grams.
You can increase a step-up transformer's voltage with
A. a power source connected to the primary coil
B. a source connected to the secondary coil.
C. increasing the number of loops in the primary coil.
D. increasing the number of loops in the secondary coil
Answer:
A. a power source connected to the primary coil
Explanation:
Calcium hydroxide is sprayed on acidic gas produced by power stations. The acidic gas is sulfuric acid. What is the word equation between calcium hydroxide and sulfuric acid?
Answer:
wait so dose it acid burn your body I would say hydrogen but I'm probably wrong tell me if I am
What are the condiction requried for
work to be done
Answer:
the object should be displaced on which the force is applied
Explanation:
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When solid materials are heated.the heat absorbed/added to the materials caused the materials to change its form
Complete question is;
When solid materials are heated.the heat absorbed/added to the materials caused the materials to change its form from?
Answer:
From solid to liquid
Explanation:
When we heat solid materials, the heat causes the forces of attraction between the molecules to become weaker and as such, the material becomes more loose than it was in the solid state. As a result, the material now becomes a liquid because the molecules now have lesser forces of attraction and are a bit loose.
The electron configuration of an element is 1s22s2. How many valence electrons does the element have? (1 point) a 1 b 2 c 3 d 4
Answer:
b
Explanation:the shell is 2 so ignore the 1s electrons it is only the level 2 electrons that are valence
Rate of diffusion of hydrogen, compared with the gases of air?
Explain your answer using the term mass
Answer:
Graham's law states that the rate of effusion or of diffusion of a gas is inversely proportional to the square root of its molecular weight. So, rate of diffusion of hydrogen gas is four times faster than oxygen gas.
Explanation:
Answer:
Rate of diffusion of hydrogen is higher than other gases because mass of hydrogen is very small and it diffuses easily.
Explanation:
please help me asap! (brainliest)
Answer:
Es so es na formula pero te balto la convinasiones de la formula
HELP ME NOW PLEASE 80 points
Answer:
1. Algae
2. Insects
3. Crayfish
4. Trout
5. Herons
Explanation:
Answer:
id.k sorry
Explanation:
____ is the amount of matter in an object. Question 1 options: Matter Gravitational Pull Mass Weight
Answer:
It's Mass
Explanation: I took the quiz
Have a good day!
Mass is the amount of matter in an object. Therefore, option C is correct.
What is mass?Mass can be defined as an intrinsic property of a body. mass can be described as the quantity of matter in a body. Different atoms and different particles with the same amount of matter have nonetheless different masses.
Mass can be experimentally measured by the body's inertia, meaning the resistance to acceleration when a net force is applied. The mass determines the strength of its gravitational attraction to other bodies.
The SI base unit of measurement of mass is the kilogram (kg) and it is not the same as weight. Mass is generally determined by measuring the weight using a spring scale, rather than a balance scale and comparing it to known masses.
An object on the Moon will weigh less than it does on Earth due to the lower gravity but still have the same mass. Weight can be defined as a force, while mass is the property that determines the strength of this force.
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predict the effect of change in temperature and pressure of the dissociation of PCL5
Answer:
Ps5
Explanation:
Answer:
well the answer to that is climate change
Explanation:
because with climate change the temperature and hot and cold it is depending on where you live
Which of these careers would a student studying biotechnology
most likely pursue?
A. electrical engineering
B. astronomy
c. agricultural research
D. geology
Agricultural research careers would a student studying biotechnology most likely pursue. Therefore, option C is correct.
What is agricultural research ?The United States Department of Agriculture's main internal research organization is the Agricultural Research Service. One of the four organizations in the USDA's mission area for research, education, and economics is ARS.
A wide definition of agricultural research is any research activity that aims to increase crop output and quality through genetic improvement, improved plant protection, irrigation, storage techniques, farm mechanization, effective marketing, and better resource management.
Agricultural research's main goals are to advance knowledge and advance technology. It deepens comprehension of the linkages and interconnectedness between farming communities and production systems.
Thus, option C is correct.
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of what does sand consist
Answer:
like ground rocks and shells I think.
Explanation:
how many energy levels does a sodium atom have?
the element sodium has 1,000,000 million energy levels. in an electrically neutral sodium atom- there are 3 energy levels.
Answer:
Sodium has 11 electrons. The first two fill the innermost energy level. The second energy level is also full, holding eight electrons and one electron remaining in the outer energy level. It is the number of outer electrons that give an element its chemical properties.
Explanation:
How many atoms are in 5.62 moles of Mercury?
Answer:
3.384364 time 10^24 atoms
Explanation:
multiply by avogadro's number
Select the boxes next to three properties that are typical of metals ??PLS I Will GIVE BRAINLY TO FIRST
Answer:
option b is correct
Explanation:
Metals are particularly good conductors of heat because their particles are very closely packed so the vibrations are passed on very quickly. They also contain large numbers of free electrons. These drift slowly through the structure, giving metals their strength and other properties. As the metal is heated, the free electrons closest to the heat source are heated. This makes them move faster and they travel through the metal, colliding with both atoms and other electrons. This naturally makes these vibrate faster (or move through the metal faster in the case of collisions with other free electrons). Thus, the heat is passed quickly through the metal.
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According to Charles's law, what will happen to the volume of these balloons as temperature
increases?
Balloons
The volume will increase and the balloons will be bigger.
O The volume will decrease and the balloons will be smaller.
The volume and balloon size will both stay the same.
Answer:
The volume will decrease and the balloons will be smaller
3 10.0 grams of granite is heated from 30 °C to 50 °C . How much energy does this require? The specific heat of granite is 0.79J/goC
Answer:
The energy required is 158 J
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
When the heat added or removed from a substance causes a change in temperature in it without affecting its molecular structure, this heat is called sensible heat.
In other words, when a system absorbs (or gives up) a certain amount of heat, it can happen that it experiences a change in its temperature, which implies sensible heat.
The equation that allows calculating heat exchanges is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case:
c=0.79 [tex]\frac{J}{g*C}[/tex]m= 10 gramsΔT= Tfinal - Tinitial= 50 C - 30 C= 20 CReplacing:
Q= 0.79 [tex]\frac{J}{g*C}[/tex] *10 g* 20 C
Solving:
Q= 158 J
The energy required is 158 J
Question 5
U
4 pts
Picture a neutral Na atom. This neutral atom will have
valence electrons. To reach a more stable configuration, this atom will
(gain, lose) electrons. The charge of the ion that forms will be
Answer:
it will have 1 valence electron as its in the first group in the periodic table.
It will lose electrons as its easier.
The charge will be 1+ as it lost 1 .
6) Using the rules for significant figures, the sum of 0.027 gram
and 0.0023
gram should be expressed as
A) 0.030 gram B) 0.0293 gram C) 0.029 gram D) 0.03 gram
I need help
Answer:
it would be C
Explanation:
Answer: C
Explanation:
both numbers have 2 S.F. so the answer should have 2 too.
The chemical reaction shown is called photosynthesis. It involves water reacting with carbon
dioxide to produce glucose (see formulae below) and another gas. The chlorophyll in leaves
acts as a catalyst. ON A PIECE OF PAPER. Write a (BN level) word equation. (G Level)
Equation with formulae. (P-E) Balanced chemical equation with states.*
CoH1206
Answer:
See explanation
Explanation:
A word equation refers to a representation of a chemical process using word rather than appropriate chemical formulae.
Hence, the word equation for photosynthesis is this;
six moles of carbon dioxide + six moles of water -----> one mole of glucose + six moles of oxygen gas
The equation with formulae is;
6CO2 + 6H20 -------> C6H1206 + 6O2
Balanced chemical equation with states;
6CO2(g) + 6H20(l) -------> C6H1206(s) + 6O2(g)
Can you identify a chemical only by knowing its physical properties?
Answer:
Any characteristic that can be determined without changing the substance's chemical identity. chemical property: Any characteristic that can be determined only by changing a substance's molecular structure
Explanation:
Which volume is the greatest?
Microliter
Milliliter
Deciliter
Centiliter
Answer:
Deciliter = 0.1 L
Explanation:
The options are unit of volume. In order to determine which is greatest, all the options would be converted to liter.
Microliter = 1e-6 L
Mililiter = 0.001 L
Deciliter = 0.1 L
Centiliter = 0.01 L
Among all the options; Deciliter = 0.1 L is the greatest.
Which of the following is a common cause of acid rain? *
1 point
oil spilled into tropical ocean waters
gases released when plants make food
emissions produced by burning fossil fuels
warm water released from nuclear power plants
Answer:
Emissions produced by burning fossil fuels
Explanation:
these gases decreases the ph level of rain water that makes water acidic
Pl help it’s for a grade I will give Brainly if right
Answer:
A. moving
Explanation:
Find the slope of BG, and HL using the coordinates; B(–4, 3), G(–2, 4), H(1, –2), L(–1, –3). then determine if the lines are parallel.
Answer:
Explanation:
How to find specific heat capacity of a liquid
Answer:
Heat Capacity = E / T.
- Find the difference in temperature for changes of multiple degrees.
- Add the appropriate units to your answer to give it meaning.
- Know that this equation works for cooling objects as well.
- Know that specific heat refers to the energy needed to raise one gram by one degree.
23. What is the molarity of NO3- in each solution?
a. 0.150 M KNO3
b. 0.150 M Ca(NO3)2
c. 0.150 M Al(NO3)3
Answer:
Explanation:
A) 0.150
B) 0.300
C) 0.450
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I really need help, I don’t know what to do on this
Answer:
A: dependent variable
B: experimental group
C: independent variable
D: control variables
E: control group
Explanation:
In the levels of organization of plants, What are the 2 tissues and their functions?