Answer: 8
Explanation: just took the mastery test
The formation of molecule can easily be shown by drawing Lewis dot structure. Since atom's Lewis dot structure has three dots. Therefore, eight lone pairs of electrons are represented in the Lewis structure of a nitrate ion (NO₃⁻).
What is Lewis dot structure?Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.
3 oxygen (O) atoms and a nitrogen (N) atoms make up basic Lewis dot of a nitrate [NO₃]⁻ ion. The molecular ion has a nitrogen (N) atom in its core and three oxygen (O) atoms, one on each side, at terminal positions.
Therefore, eight lone pairs of electrons are represented in the Lewis structure of a nitrate ion (NO₃⁻).
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Which part of the scientific cycle does the graph directly represent?
Experiments
Explanations
Questions
Facts
Answer:
Experiments
hope this helps:)
Answer:
experiments
Explanation:
...
Consider this equation: 2.524 g (5.1 × 106 g) ÷ (6.85 × 103 g) = ? How many significant figures should the result have?
Answer:
7
Explanation:
2.524g(5.1)(106)g
(6.85)(103)g
=
1364.4744g2
705.55g
=
1364.4744g
705.55
=
1364.4744g
705.55
=1.933916g
Answer:
2
Explanation:
YES
Total these measurements. Your answer should indicate the proper accuracy.
28 L
42 L
6 L
931 L
____
Your answer should indicate the proper precision (correct number of insignificant figures).
1. 1,010 L
2. 1,007.0 L
3. 1,007 L
4. 1,000 L
Answer:
The sum of given measurements is 1007 L.
Explanation:
The given measurements are 28 L, 42 L, 6 L, and 931 L.
We need to find the total of these measurements.
Total = 28 L + 42 L + 6 L + 931 L
It can be written as
Total = ( 28 +42+6+931)
One simplification we get Total = 1007 L
in descriptive scientific investigations scientis often make observations to understand the interacting parts of a complex
The answer is System.
When a scientific investigation is in progress, its used to perform and understand the natural phenomenon that goes on using the scientific method. Since this is a descriptive investigation, it provides a descriptive account of any system by looking at it without any prior knowledge to that subject. This method of investigation does not use a hypothesis. Thus, proves our answer correct.
Best of Luck!
Answer:
The answer is System.
Explanation:
When a scientific investigation is in progress, its used to perform and understand the natural phenomenon that goes on using the scientific method. Since this is a descriptive investigation, it provides a descriptive account of any system by looking at it without any prior knowledge to that subject. This method of investigation does not use a hypothesis. Thus, proves our answer correct.
Siya saw two elements X and Y. Element X is shiny and hard, while element Y is dull and
brittle. Which of the two elements is more likely to be a good conductor of electricity?
Answer:element x
Explanation:because element x is shiny and hard and that's a property of metals and metals are good conductors of heat and electricity
why scientists use the word dominant
Answer:
Dominant traits are traits that more likely to be transferred from a parent to an offspring so scientist use this term dominant.
Answer:
Scientists use the word dominant for certain traits because they are more likely to show up. There are two different types of alleles for traits: dominant and recessive. Capital letters mean dominant and lowercase mean recessive. Scientists also use the word dominant for certain traits when certain traits stand out and are more prone to show up in offspring.
A student in a chemistry class mixes together two chemicals and observes bubbling and the beaker getting hotter. There was also a dark blue precipitate settling down to the bottom of the beaker. Did a new substance form during the investigation?
Explanation:
Obviously there's an exothermic reaction going on, which suggests a neutralisation reaction. A dark blue precipitate is formed, which could be a copper salt. So a new substance formed.
There is undoubtedly an exothermic reaction occurring, which denotes a neutralization reaction. A dark blue precipitate that could be a copper salt forms. Thus, a new material developed.
Why does the pace of a reaction increase as temperature rises?The average kinetic energy of the molecules rises as the reactants heat up. This indicates that more molecules are traveling more quickly and colliding more forcefully. The pace of the reaction rises as more molecules collide with one another with sufficient energy to cause a reaction.
Usually, a reaction's rate increases as temperature rises. As a result, a higher percentage of molecules will possess the minimal amount of energy required for a successful collision.
Endothermic reactions occur when two substances interact and the temperature of the resulting mixture drops.
learn more about exothermic reaction refer
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How can nuclear energy be converted in electrical energy
Answer:
A clean energy resource
Nuclear energy originates from the splitting of uranium atoms – a process called fission. This generates heat to produce steam, which is used by a turbine generator to generate electricity. Because nuclear power plants do not burn fuel, they do not produce greenhouse gas emissions.
Explanation:
Answer:
Nuclear energy originates from the splitting of uranium atoms – a process called fission. This generates heat to produce steam, which is used by a turbine generator to generate electricity. Because nuclear power plants do not burn fuel, they do not produce greenhouse gas emissions.
Explanation:
What do group numbers on the periodic table identify?
valence electrons
which is an outer shell electron
A student lists three temperature measurements: 100°F, 100°C, and 100 K. Of the three measurements, 100 K is the highest temperature.a. Trueb. False
Answer:
The answer is False.
Explanation:
To find which is the highest temperature we need to convert the °C and °F units to °C:
[tex] T_{1} = 100 K [/tex]
[tex] T_{2} = 100 ^{\circ} C + 273 = 373 K [/tex]
[tex] T_{3} = \frac{5}{9}*(100 ^{\circ} F - 32) = 37.78 ^{\circ} C [/tex]
[tex] T_{3} = 37.78 ^{\circ} C + 273 = 310.78 K [/tex]
Therefore, the answer is False, since the highest temperature is 100 °C.
I hope it helps you!
Answer:
The answer is False, or ¨F¨.
Why can’t you taste or touch any materials at the Laboratory
How would you separate a mixture of sand, salt, and iron?
(Put it in a list)
What is one important step to complete before starting a laboratory experiment?
O Clean up the materials that were used.
Discard chemicals in the proper waste bin.
O Ask the teacher if you are confused about the laboratory procedure.
Change into contact lenses to protect your glasses,
Answer:
Ask the teacher
Explanation:
Ask if you have to clean up or if you are not prepared for an experiment
Answer:
ask the teacher
Explanation:
because he needs help so he has to task the teacher.
What NaClNaCl concentration results when 259 mL259 mL of a 0.850 M0.850 M NaClNaCl solution is mixed with 567 mL567 mL of a 0.240 M0.240 M NaClNaCl solution?
Answer:
0.431M
Explanation:
To find the concentration of NaCl we need to know how many moles comes from each solution. Then, we need to sum the total volume in liters and, as molarity (Unit of concentration) is the ratio between moles and volume we can determine concentration.
Moles from first solution:
259mL = 0.259L * (0.850mol / L) = 0.22015 moles of NaCl
Moles from second solution:
567mL = 0.567L * (0.240mol / L) = 0.13608 moles of NaCl
Total moles:
0.22015 + 0.13608 = 0.35623 moles of NaCl
Total volume:
259mL + 567mL = 826mL = 0.826L
Thus, molarity of the mixture is:
0.3562 moles NaCl / 0.826
0.431M
Water is being pumped out of a reservoir at a rate of 2.54 liters per 15.0 seconds. If the reservoir contains 1.0500 x 106 gallons of water, how many hours will it take to empty it?
Answer:
It will take 6,519.44 hours to empty the reservoir.
Explanation:
First of all, you should know that 1 gallon = 3.785 L
So, you can apply the following rule of three to know the amount of water in liters in the reservoir: if 1 gallon is 3.785 liters, 1.0500 * 10⁶ gallons of water, how many liters are they?
[tex]amount=\frac{1.0500*10^{6} gallons*3.785 liters}{1 gallon}[/tex]
amount= 3,974,250 liters
Knowing that water is pumped out of a reservoir at a rate of 2.54 liters every 15.0 seconds, you now want to pump 3,974,250 liters of water out of the reservoir. For that you apply the following rule of three: if 2.54 liters are pumped out every 15 seconds, how long does 3,974,250 liters take to be pumped out?
[tex]time=\frac{3,974,250 liters*15 seconds}{2.54 liters}[/tex]
time= 23,469,980.32 seconds
With 1 hour 60 minutes and 1 minute equal to 60 seconds, then 1 hour represents 3,600 seconds. So you apply the following rule of three: if 3,600 seconds is 1 hour, 23,469,980.32 seconds, how many hours are they?
[tex]time=\frac{23,469,980.32 seconds*1 hour}{3600 seconds}[/tex]
time=6,519.44 hours
It will take 6,519.44 hours to empty the reservoir.
All atoms of the same element have the same
Explanation:
proton ..............
which of the following statements is/are true about the atom labeled X in the attached picture
.Explanation: ..............
A marble was rolled along the a flat surface. The position and data was collected.
What type of graph would best represent the data?
A. Pie chart
B. Bar graph
C. Histogram
D. Scatter plot
All of the atoms of argon have the same
a
mass number
b
atomic number
c
number of neutrons
d
number of nucleons
The answer is same atomic number!
song about scientific method
Answer:
Hypothesis, Prediction, Experiment, Analyze Data, and Draw a Conclusion.
Explanation:
Number of
Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
20
20
A
B
С
9
D
E
19
F
Using the periodic table, complete the table to describe each atom. Type in your answers.
Answer:
symbol= F
proton= 9
neutron= 19 I understand this is it ok for you
Why shouldn’t we fill up balloons with hydrogen gas ?
Answer: Because hydrogen is a gas.
Explanation: If children were running around with balloons filled with hydrogen gas, then they would catch fire. So the answer to your question is, its simply dangerous.
Based on the physical appearance of the two crystal samples, which is a metal?
Answer:
The Answer Is: A: Sample A
Explanation:
Because It Is Shiny ( Part of what the person said on edge)
Answer:
Sample A
Explanation:
On edg 2020
Sorry is if i'm answering this late. T^T
Find the distance between the two points on a number line
-18 and -4
Answer:
14
Explanation:
starting from phenol how would you obtain benzaldehyde
Answer:
A significant quantity of natural benzaldehyde is produced from cinnamaldehyde obtained from cassia oil by the retro-aldol reaction: the cinnamaldehyde is heated in an aqueous/alcoholic solution between 90 °C and 150 °C with a base (most commonly sodium carbonate or bicarbonate) for 5 to 80 hours, followed by ...
Explanation:
Which is a base unit used in the metric system? quarts liters pints degrees Fahrenheit
Answer:
liters
Explanation:
the answer is liters after searching and searching and searching i found it now i winnnn
Answer:
LITERS (B)
Explanation:
How many millimeters are there in 5.12 x 10^5
kilometers? (1000 millimeters = 1 meter, 1000
meters - 1 kilometer) (Use 3 sig figs in your answer.)
Answer:
5.12x10¹¹ millimeters
Explanation:
Milli is a prefix used in science and engineering to decribe the number as the exponent x10⁻³. In the prefix kilo, the number is at the exponent x10³.
5.12x10⁵ kilometers are:
5.12x10⁵ kilometers * (1000m / 1km) = 5.12x10⁸ meters
5.12x10² meters * (1m / 1000millimeters) = 5.12x10¹¹ millimeters
does ice steam or water have more energy
Answer:
steam.
Explanation:
Gasses have the most kinetic energy compared to liquids and solids.
steam is the gaseous form of h2o
water is the liquid form and ice is the solid
Which statements about volume are true? Choose all the answers that apply. Group of answer choices Does not apply to liquids Applies only to objects with irregular shapes Measures the amount of space occupied by an object Equals the displacement of an object in water Lacks physical dimension Can be measured in milliliters or cubic centimeters
Answer: Measures the amount of space occupied by an object
Equals the displacement of an object in water Lacks physical dimension Can be measured in milliliters or cubic centimeters
Explanation:
The statements which are true about volume are;
Measures the amount of space occupied by an object.Equals the displacement of an object in water.Discussion:
The volume of an object is a measure of the space it occupies. On this basis is the definition of matter as an object that occupies space.
Additionally, when an object is immersed in water; it's volume equals the volume occupied by the water displaced by it.
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a balance reads an object A to be 45.1kg the balance reads another object B to be 33.46kg what is the total weight of both objects
All we need to do is add.
45.1 + 33.46 = 1509.046
Therefore, the total weight of both objects is 1,509.046kg
Best of Luck!