Answer:
the answer is C
Explanation:
Answer:C B
Explanation:
PLS HELP!!!!! 30 POINTS!!!!
Groups of students weighed three different samples of magnesium sulfate. The samples actually weigh 5.25 grams each. Determine whether each group’s data set is accurate, precise, both, or neither.
Drag the tiles to the correct boxes to complete the pairs.
Answer:
1. accurate but not precise
2. precise but not accurate
3. accurate and precise
4. neither
Explanation:
hope this helps :)
The accuracy is always followed by precision, but a high degree of precision does not imply accuracy. All the accurate results will be definitely precise.
What is accuracy and precision?The accuracy of a determination is defined as the concordance between the result and the true value or most probable value. The precision of a determination is known as the concordance of a series of measurements of the same quantity.
The accuracy expresses the correctness of a measurement while precision of a set of results expresses the reproducibility of a measurement.
Accuracy is related to how close the observed result is to the true value while precision is related to how close the measurements are to each other.
The given measurements are denoted as:
1. Accurate but not precise
2. Precise but not accurate
3. Accurate and precise
4. Neither
Thus accurate results will be precise but precise results may not be accurate.
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What is the resistance of a blub when the voltage across is 6 V and the current is 0.2A?
Answer:
30 Ohms (Ω)
Explanation:
Resistance = Voltage/Current
R = 6/0.2
R = 30 Ohms (Ω)
How could you classify these chemicals in one group: iron, gold, and tin?
O A. Magnets
O B. Metals
O C. Solutions
O D. Solids
Answer:
Metals
Explanation:
All these are metals
Answer:
B: It is metals.
Explanation:
Look at your periodic table to locate iron, gold, and tin.
Iron is Fe
Gold is Au
Tin is Sn
They are all located in the transition metals area.
So the chemicals are metals.
Hope it helped!
Describe the difference between the normal and
mutated hemoglobin amino acid sequences:
Answer:
The chain of colored boxes represent the first eight amino acids in the beta chain of hemoglobin. The sixth position in the normal beta chain has glutamic acid, while sickle beta chain has valine. This is the sole difference between the two
Explanation:
PLEASE HELPPPPP 12 POINTS
Answer: It most likely represents a canyon.
What happens to the energy that is stored in cells? Check all that apply.
It is released slowly.
It is released quickly.
It is released in a single reaction.
It is released in a series of reactions.
It is used by cells for repair and growth.
In a controlled experiment, the single factor manipulated by the researcher is
the dependent variable and the responding factor that is measured is the
independent variable.
true or false
Answer:
False
Explanation:
It is the opposite. A good way to remember is the that the dependent variable depends on the independent variable.
because of friction?
Answer:
what do you mean?
Explanation:
Balance the following chemical equation by providing the correct coefficients.
I’ll put a pic.
Please help!!!!!!!
Answer:
[2]HBr + [ ] Ba(OH)2 ➖ [ ] BaBr2 + [2] H20
Hope it will help :)
What do the dots in this image represent?
Ionic bonds in water
Covalent bonds in water
Shared valence electrons
Unshared/lone pairs of valence electrons
The dot in the image represents the unshared/ lone pair of electrons. The correct option is D. Dots are written around the element in an equation.
What are unshared electrons?Unshared or lone electrons are those electrons, which are lone and not shared with another atom when making a covalent bond. These electrons are represented by dots. The valence electron help in making the valence complete of other atoms when forming a bond.
The diagram is of water, oxygen has six valence electrons, of which two are shared by hydrogen and four are lone electrons. The lone pairs will be attached to other hydrogen molecules.
Thus, the correct option is D, Unshared/lone pairs of valence electrons regarding the representation of the dots in the image given.
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How many moles are equal to 89.23g of aluminum chloride, AlCl3?
Answer:
[tex]\boxed {\boxed {\sf 0.6692 \ mol \ AlCl_3}}[/tex]
Explanation:
To convert from grams to moles, we must use the molar mass. This can be calculated using the Periodic Table.
1. Molar Mass
First, identify the elements in the compound AlCl₃. They are aluminum and chlorine. Now find the masses:
Al: 26.981538 g/mol Cl: 35.45 g/molTake a look at the compound. There is a subscript of 3 after chlorine, so we must multiply its molar mass by 3 then add aluminum's.
AlCl₃= 3(35.34 g/mol) + 26.981538 g/mol = 133.331538 g/mol2. Convert Grams to Moles
We can use the molar mass as a ratio.
[tex]\frac{133.331538 \ g \ AlCl_3}{1 \ mol \ AlCl_3}[/tex]
Multiply by the given number of grams: 89.23
[tex]89.23 \ g \ AlCl_3 * \frac{133.331538 \ g \ AlCl_3}{1 \ mol \ AlCl_3}[/tex]
Flip the fraction so the grams of aluminum chloride cancel out.
[tex]89.23 \ g \ AlCl_3 * \frac{1 \ mol \ AlCl_3}{133.331538 \ g \ AlCl_3} = 89.23 \ * \frac{1 \ mol \ AlCl_3}{133.331538}[/tex]
[tex]\frac{89.23 \ mol \ AlCl_3}{133.331538}[/tex]
[tex]0.6692340112 \ mol \ AlCl_3[/tex]
3. Round
The original measurement of grams has 4 significant figures. We must round to 4 sig figs.
For the number we calculated, that is the ten thousandth place.
The 3 in the hundred thousandth place tells us to leave the 2.
[tex]0.6692 \ mol \ AlCl_3[/tex]
There are about 0.6692 moles of aluminum chloride in 89.23 grams.
Based on what basis the elements had been arranged
in the modern periodic table?
A - The increase in the atomic mass
B – The increase in the atomic number
C - The classification of elements into metals and
nonmetals
D - The classification of elements according to their
Answer:
B
The increase in the atomic number
1.Which form of energy is due to the motion of an object's particles .
A. thermal energy, B.chemical energy C.mechanical energy D.electromagnetic energy
Answer:
thermal
Explanation:
Thermal energy is due to the motion of an object's particles, due to the random movement of molecules in a system, thermal energy also known as random or internal kinetic energy is produced, hence option A is correct.
Atoms or molecules in motion are the source of thermal energy. An object's thermal energy rises as its temperature rises because the movement of its molecules or atoms accelerates. It is possible to transmit an object's thermal energy to another.
Thermal energy, also known as random or internal kinetic energy, is created when molecules in a system move randomly, as a result of the motion of an object's particles.
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explain why aluminium oxide must be molten for electrolysis to take place.
Answer:
The extraction is done by electolysis but first the aluminium oxide must be melted so that electricity can pass through it...The use of molten cryolite as a solvent reduces some of the Energy
costs involved in extracting aluminum by allowing the ions in aluminum oxide to move freely at low temperature ..
Convert this temperature from F to C
26.6°c
93.600
62.2°C
5.7°C
HELP PLEASE!
How many molecules are in 6.06 grams of NH3?
(please show steps so I can understand what I'm supposed to do to get the answer)
What are some properties of an ice cube that tell you it is a solid? Write at least one property, and explain
how it relates to an ice cube.
Answer:
Well ice cubes are normally liquids but it is frozen water making it a solid. Since they are made of water particles, they wouldn't normally be a solid, but the particles are packed close enough together to make it one. Hope this helps! :D
Explanation:
Name the main chemical in baking powder
Answer:
sodium bicarbonate
Answer:
Baking powder
Explanation:
Baking powder is a solid mixture that is used as a chemical leavening agent in baked goods. It can be composed of a number of materials, but usually contains baking soda (sodium bicarbonate, NaHCO3), cream of tartar (potassium bitartrate, C4H5KO6), and cornstarch. (A base, an acid, and a filler respectively.)
Balance the following Equation Show your work.
1.____CaO + ____H2O → ____Ca(OH)2
2. ___HgO → ___Hg + ____O2
3. ___KI + ___Pb(NO3)2 → ____PbI2 + ___KNO3
4. ___Al + ___Cl2 → ___AlCl3
5. ___KBr + ___Cl2 → ___KCl + ____Br2
6. __Mg3(PO4)2 + __NaOH → __Na3PO4 + __Mg(OH)2
7. ___H2O → ___H2 + ___O2
8. ___CH4 + __O2 → __CO2 + __H2O
9. ___C2H6 + ___O2 → ___CO2 + ___H2O
10. ___H2 + ___N2 → ___NH3
Answer:
1) alr balanced
2) 2 2 1
3) 2 1 1 2
4) 2 3 2
5) 2 1 2 1
6) 1 6 2 3
7) 2 2 1
8) 1 2 1 2
9) 2 5 4 6
10) 3 1 2
The diagram below shows a food web in a woodland.
If a certain organism is a secondary consumer, what best explains its position in the food web?
A X, because organism X feeds on producers
B Y, because organism Y feeds on producers
C X, because organism X feeds on a carnivore
D Y, because organism Y feeds on a herbivore
Answer:
Y because organism y feed on herbivores
Explanation:it means y is carnivores or omnivores
Explanation:
What is the mass in grams of 2.70 moles of zinc (II) oxide?
Answer:
219.73 g
Explanation:
The molecular formula of zinc (II) oxide is ZnO. This means its molar mass would be:
Molar Mass of ZnO = (Atomic Mass of O) + (Atomic Mass of Zn)Molar Mass of ZnO = 16 + 65.38 = 81.38 g/molWith that molar mass, we can convert moles into grams:
mass = moles * molar massmass = 2.70 moles * 81.38 g/mol = 219.73 gWhat is the potential energy of a bird sitting in a tree if the bird has a mass of 2Kg and it is 10 meters above the ground?
The potential energy of a bird : 196 J
Further explanationGiven
mass of bird = m = 2 kg
height = h = 10 m
Required
The potential energy
Solution
Potential energy is the energy that objects have because of their position. Usually related to the earth's gravitational force
Can be formulated
PE = m g h
g = acceleration due to gravity ⇒ 9.8 m/s²
Input the value :
PE = 2 kg x 9.8 m/s² x 10 m
PE = 196 J
Please help me if your good with science:).
What is the speed of the train?
A.)1200km/h
B.)4 km/h
C.)75 km/h
D.)300 km/h
Which of the following gases was NOT part of Earth’s original atmosphere?
Answer:anser choices
Explanation:
Answer:oxygen hahah
Explanation:
Calculate the number of carbon atoms contained in 5.6 g of C2H4
Molecular mass of C₂H₄ is,
M = 2×12 + 4×1 g/mol
M = 28 g/mol
Moles of C₂H₄ in 5.6 g of C₂H₄ :
n = 5.6/28 mol
n = 0.2 mol
Now, 1 mol of C₂H₄ contains 2 moles of carbon.
So, number of moles of carbon are :
n = 0.4 mol
We know, 1 mol of any atom contains 6.022 × 10²³ atoms.
So, number of carbon atoms are :
[tex]N = 0.4 \times 6.022\times 10^{23} \\\\N = 2.409 \times 10^{23}[/tex]
Hence, this is the required solution.
2. Which substance has the greatest molecular
mass?
(1) H2O2
(3) CF4
(2) NO
(4) I2
Answer:
The answer is choice (4)
Explanation:
Laker in 5 !!!
The substance with the greatest molecular mass is I₂.
The molecular mass is the sum of the atomic masses of all atoms in a molecule
Let's calculate the molecular mass of each compound to know the greatest.
molecular mass of H₂O₂ = 2 + 32 = 34 g/mol
molecular mass of CF₄ = 12 + (19 × 4) = 12 + 76 = 88 g/mol
molecular mass of NO = 14 + 16 = 30 g / mol
molecular mass of I₂ = 127 × 2 = 254 g/mol
Therefore, the substance with the greatest molecular mass is I₂.
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PLEASE HELP ASAP I CANT FAIL THIS I NEED HELP. The
is the control center of the nervous system. It sends and receives signals to and from the entire body.
OA. spine
OB heart
OC. brain
OD. stomach
Answer:
brain
Explanation:
The central nervous system (CNS) controls most functions of the body and mind. It consists of two parts: the brain and the spinal cord. The brain is the center of our thoughts, the interpreter of our external environment, and the origin of control over body movement.
Answer:
OC brain, due to the brain being basically the smarts of your body, combined with it also managing, important functions of the body
Explanation:
When determining reaction orders by experiment, the most common procedure is to ______. Multiple choice question. keep all reactant concentrations constant for each determination change all reaction concentrations by the same amount each time change the concentration of one reactant while keeping the other concentrations constant
Answer:
change the concentration of one reactant while keeping the other concentrations constant
Explanation:
For a given reaction;
A + B --> C + D
The reaction rate may be given as;
Rate = k[A][B]
In the above rate equation, the orders of both reactants ( A and B) is 1 . Reaction order is basically how the concentration of the reactant affect the rate of the equation.
The correct option is;
change the concentration of one reactant while keeping the other concentrations constant.
That way, one can monitor how a particular reactant affect the rate of the reaction.
LAST QUESTION! THANKS SO MUCH FOR EVERYTHING!! :)
Answer:
D. Condensation
Explanation:
Explain which has a greater impact on the kinetic energy of an object - the
object's mass or the object's speed?
Answer:
it is the objects mass, I learned this last semester
The object's mass has a greater impact on the kinetic energy of an object as it is the mass the mass on which force is exerted and in which energy is stored to be transformed in to kinetic energy.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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