Answer: They are non-reactive and don't conform with other elements to form compounds. Because they are non-reactive, they don't corrode easily.
Explanation:
The properties of gold and platinum which make these metals desirable for jewelry is due to their electronic configuration due to which they are non-reactive and do not corrode easily.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Anyone know the answer
Answer:
a and d
Explanation:
a bromine and the calcium atom loses two elections
A 10g sample of Fe reacts with O to form 18.2g of FeO. How many grams of O reacted?
Answer:
Mass of O = 8.2 gram
Explanation:
Given:
Mass of Fe = 10 g
Total volume = 18.2 g
Find:
Mass of O
Computation:
Using Conservation of total mass
Total volume = Mass of O + Mass of Fe
18.2 = Mass of O + 10
Mass of O = 8.2 gram
Please help I will mark brainy
Answer:freezing can occur
Source:trust me bro
What separates the inner planets from the outer planets in our solar system?
()Comet Belt
()Asteroid Belt
()Their differences
()Distance
Help plss!!
Answer:
the answer is B Astroid Belt
Sodium metal and chlorine gas are combined in a reaction to produce sodium chloride also known as table salt. What are the reactants?
Group of answer choices
Sodium metal only
Chlorine gas only
Sodium Chloride (salt)
Chlorine gas and Sodium Chloride (salt)
Sodium metal and Chlorine gas
Answer: sodium metal and chlorine gas
Explanation:
A bottles contains 3.100 mL of a liquid. The mass of the liquid is 2.060 g. What is the density of the liquid? (BE SURE TO
SHOW ALL THREE PARTS: EQUATION, WORK, AND PROPER FULL ANSWER.
Answer:
0.66 g/mLExplanation:
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{2.06}{3.10} \\ = 0.664516..[/tex]
We have the final answer as
0.66 g/mLHope this helps you
Someone please help will mark as brainliest please answer all of the questions
Answer:
1.The main difference between SPECT and PET scans is the type of radiotracers used. While SPECT scans measure gamma rays, the decay of the radiotracers used with PET scans produce small particles called positrons. ... These react with electrons in the body and when these two particles combine they annihilate each other.
2 .A single photon emission computed tomography (SPECT) scan is an imaging test that shows how blood flows to tissues and organs. It may be used to help diagnose seizures, stroke, stress fractures, infections, and tumors in the spine.
3.Uses for PET scan include checking brain function; diagnosing cancer, heart problems, and brain disorders; examining blood flow to the heart; and determining spread of cancer and response to therapy. The use of PET scans may help doctors more accurately detect the presence and location of cancer cells.
4.Stress-only SPECT protocols resulting in lower dosimetry and less time in the imaging laboratory may be appropriate for many patients. PET perfusion imaging offers indisputably better images that are characterized by higher resolution, better attenuation correction, less scatter, and better contrast
Hope I wasn't too late.
Which of the following describes redox in displacement plating?
Ch 8 Test
Circle the best answer to each question
The temperature of a roast is checked to see if it has met its critical limit of 145 F. for 4 min. This is an example of which HACCP principle?
Verification
Monitoring
Record keeping
Hazard analysis
2. The temperature of a pot of beef stew is checked during holding. The stew has not met the critical limit and is thrown out according to house policy. Throwing out the stew is an example of which HACCP principle?
Monitoring
Verification
Hazard analysis
Corrective action
3. The deli serves cold sandwiches in a self serve display. Which step in the flow of food would be a critical control point?
Storage
Cooling
Cooking
Reheating
4. What is the first step in developing a HACCP plan?
Identify corrective actions
Conduct a hazard analysis.
Establish monitoring procedures.
Determine critical control points
5. What is the purpose of a food safety management system?
Keep all areas of the facility clean and pest free
Identify, tag, and repair faulty equipment within the facility
Identify and control possible hazards throughout the fowo of food
Document and use the correct methods of purchasing and receiving food
6. Reviewing Temperature logs and other records to make sure that the HACCP plan is working as intended is an example of which HACCP principle?
Monitoring
Verification
Hazard Analysis
Record Keeping
7. A Chef sanitized a thermometer probe and then checked the temperature of minestrone soup being held in a hot holding unit. The temperature was 120 F., which did not meet the operations critical limit of 135 F. The chef recorded the temperature in the log and reheated the soup to 165 F. for 15 sec. Which was the corrective action?
Reheating the soup
Checking the critical limit
Sanitizing the thermometer probe
Recording the temperature in the log
8. What does an operation that wants to smoke food as a method of preservation need to have before processing food this way?
Food Safety certificate
Crisis management plan
Master cleaning schedule
Variance from the local regulatory authority
Answer:
so you like fortnite but it's bad rjfbfbhrr
Which of the following is a characteristic of covalent compounds?
Name the Ionic Compounds listed below.
1.) Al2O3 =
2.) NaCl=
3.) MgO =
4.) CaCl2=
Answer:
1. Aluminum oxide
2. Sodium chloride
3. Magnesium oxide
4. Calcium Chloride
Explanation:
Ionic compounds with only 2 elements all end with "ide" Use the full name of the element listed first and the second element with ide. Ex: Chlorine would become chloride.
Answer:
Explanation:
1. Al2O3 = Aluminum Oxide
2. NaCl = Sodium Chloride
3. MgO = Magnesium Oxide
4. CaCl2 = Calcium Chloride
A tank containing oxygen, carbon dioxide, and nitrogen gases has a total pressure of 6.7
atm. If the O2 has a pressure of 3.0 atm and the carbon dioxide has a pressure of 1.2
what is the partial pressure of the nitrogen gas?
Answer:
P(N₂) = 2.5 atm
Explanation:
Given data:
Total pressure of gasses = 6.7 atm
Partial pressure of O₂ = 3.0 atm
Partial pressure of CO₂ = 1.2 atm
Partial pressure of N₂ = ?
Solution;
According to Dalton law of partial pressure,
The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.
Mathematical expression:
P(total) = P₁ + P₂ + P₃+ ............+Pₙ
Now we will solve this problem by using this law.
P(total) = P(O₂) + P(CO₂) + P(N₂)
6.7 atm = 3.0 atm + 1.2 atm + P(N₂)
6.7 atm = 4.2 atm + P(N₂)
P(N₂) = 6.7 atm - 4.2 atm
P(N₂) = 2.5 atm
if the mass of 3 black beans it's 0.7 what's the mass of one bean?
Answer:0.233333333
Explanation: Let me be!
Answer:
yea what that guy said is correct I'm pretty sure
What type of compound is this?
Answer:sorry id ont known
Explanation:give m brianlest if you want
What are the differences and relationships between a dependent variable and an independent variable?
Explanation:
A dependent variable depends on the independent variable. The independent variable is what you usually control in a experiment.
Which group of elements in the periodic table contains the noble gases?"
O Group 1
O Group 13
O Group 10
O Group 18
Answer:
its the 4th one (group 18 )
I need help......................
The answer is -1 as they gain 1 electron
How many moles of Mg(OH)2 will react with 2.5 mol HCI?
Answer:
1.25mole of Mg(OH)₂
Explanation:
The reaction is between Mg(OH)₂ and HCl, this is a neutralization reaction between an acid and a base.
Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O
The balanced reaction equation is given above.
2 mole of HCl reacts with 1 mole of Mg(OH)₂
So, 2.5mole of HCl will react with [tex]\frac{2.5}{2}[/tex] = 1.25mole of Mg(OH)₂
The number of moles of Mg(OH)₂ is given as 1.25mol
A 0.040 kg ball tied to a string moves in a circle that has a radius of 0.700 m. If the ball is accelerating at 43.2 m/s2, what is the tangential velocity of the ball?
Answer: 30.24 m/s
Explanation:
Got it right on test
What is the percentage composition of each element in carbon dioxide, CO2? Remember percent composition is based on mass. (Show your calculations for full credit.)
%C = 27.3%
%O=72.7%
Further explanationProust states the Comparative Law that compounds are formed from elements with the same Mass Comparison, so that compounds have a fixed composition of elements
The empirical formula is the mole ratio of compounds forming elements.
MW CO₂ : 44 g/mol
Ar C = 12 g/mol
Ar O = 16
%C[tex]\tt \dfrac{12}{44}\times 100\%=27.3\%[/tex]
%O[tex]\tt \dfrac{2.16}{44}\times 100\%=72.7\%[/tex]
What is the affected variable in an experiment. A:independent. B:dependent. C:control
In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. The researcher can operationalize (i.e. define) the variables being studied so they can be objectivity measured.
IamSugarBee
Which element could provide one atom to make an ionic bond with calcium
which two elements make up the main structure of an organic compound?
A. Carbon and oxygen
B. Nitrogen and oxygen
C. Carbon and hydrogen
D. hydrogen and sulfur
Answer:
b nitrogen&oxygen
Explanation:
i'm built different
What is the speed of an object that covers 10 miles in 5 hours?
a. 5 mph
b. 15 mph
c. 2 mph
d. 50 mph
Answer:
2 miles per hour.
Explanation:
10/5=2
To solve this we must be knowing each and every concept related to speed and its calculations. Therefore, the correct option is option C.
What is speed?Speed may be defined as the distance traveled by an item in the amount of time it requires to travel that distance. In other words, it measures how rapidly an item travels but does not provide direction.
The Scientific unit system is most typically used to express speed. Speed is determined in metres per second, or m/s, since distance is recorded in metres while time is recorded in seconds.
Mathematically,
speed= distance/ time
distance= 10 miles
time= 5 hours
substituting all the given values in the above equation, we get
speed=10/5
on calculations, we get
speed = 2 mph
Therefore, the correct option is option C.
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Help answer fast please What is an example of homestasis?
A. You drink a bunch of redbull and your heart rate goes up
B. You run, your heart rate goes up, and then your heart rate goes back to its resting rate
C. A person has a fever
D. A person is thirsty but does not drink water
Answer:
c maybe sorry if its wrong
Explanation:
Write one paragraph explaining what you have learned so far about Kinetic and Potential Energy.
(will give brainliest)
Answer: Energy stored in an object due to its position is Potential Energy. The energy that a moving object has due to its motion is Kinetic Energy. All forms of kinetic energy are the result of a previous state of potential energy. For example, the stored chemical potential energy of a battery converts to electrical kinetic energy to transport electricity to a light bulb, which radiates thermal kinetic energy. Potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.
a ball with a mass of 20 kg is accelerating at 4 m/s/s while being thrown . about how much force was used to throw the ball
Answer:
80 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 20 × 4
We have the final answer as
80 NHope this helps you
Answer:
80 n
Hope I helped
What Group would this element be in?
Answer:
Non-metals because it has 9 electrons meaning it is fluorine
Explanation:
Question 14
An element's periodic table identity is defined by its number of
А.
neutrons.
B
isotopes.
С C
electrons.
protons
Answer:
c
Explanation:
protons are the atomic number which define an element
I pushed a 2 kg car with an 8 N force. Calculate the acceleration.
Answer:
4 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{8}{2} \\ [/tex]
We have the final answer as
4 m/s²Hope this helps you