Answer:
A
Explanation:
Did the quiz
The statement from the lab report best represents a conclusion, based on our results, students who do 1 hour of chores per night have grades that are on average 0.2 points higher than students who do no chores. The correct option is A.
What is a scientific investigation?A scientific investigation is an investigation that is done by experimenting or solving things by scientific methods. These methods include variables, and controlled calculation and time.
Here, the lab investigation is saying the relationship between the number of times students are spending the time doing chores every night
Thus, the correct option is A. According to our findings, pupils who perform one hour of chores each night earn, on average, 0.2 points more than those who do not.
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How many control(s) are in an experiment
What are the three major kinds
of rocks?
the three major kinds of rock are
* igneous rock
* sedimentary rock
* metamorphic rock
What do you know for sure after one test? Two tests? Three tests?
(115 pts.) Ferrous nitrate reacts with silver nitrate in aqueous solution to form ferric nitrate and metallic
silver according to the chemical equation
Fe(NO3)2(aq) + AgNO3(aq) + Fe(NO3)3(aq) + Ag(s),
for which K = 3.0.
(a) Derive the net ionic equation for this reaction.
(b) Determine whether the reaction is a replacement reaction or an oxidation-reduction
reaction, and, in the latter case, identify the oxidizing and reducing agents.
(c) Write the expression for Q in terms of the activities (the [] symbols) of the species
responsible for driving the reaction to equilibrium.
Answer:
Explanation:
a )
Fe(NO₃)₂(aq) + AgNO₃(aq) = Fe(NO₃)₃(aq) + Ag(s)
Fe⁺² + 3NO₃⁻ + Ag⁺ = Fe⁺³ + Ag + 3NO₃⁻
b )
Reaction is an oxidation - reduction reaction .
oxidation :--
Fe⁺² = Fe⁺³ + e⁻
Reduction : ---
Ag⁺ + e = Ag
c )
Q = [ Fe( NO₃)₃ ] / [ Fe(NO₂) ] [ AgNO₃ ]
Which lists imaging techniques that use wave behaviors in order of increased risk of cancer from least risk to
greatest?
sonography, X-ray radiography, CT scan
CT scan, X-ray radiography, sonography
sonography, CT scan, X-ray radiography
X-ray radiography, sonography, CT scan
Answer:
sonography, X-ray radiography, CT scan
Explanation:
i like yo cut g
The imaging techniques that use wave behaviors in order of increased risk of cancer from least risk to greatest is:
Option A.
Imaging techniques:These procedures incorporate x-beams, figured tomography filters, and attractive reverberation imaging. These imaging devices let your PCP "see" inside your body to get an "image" of your bones, organs, muscles, nerves, and ligaments. This is a way the specialist can decide whether there are any anomalies.
The imaging techniques that use wave behaviors in order of increased risk of cancer from least risk to greatest are:
A. sonography< X-ray radiography<CT scan
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28Which is true?
a)All elements are made of atoms.
b)All atoms are made of elements.
c)Atoms can be seen with normal microscopes.
d)Only some types of matter are made of elements.
29Which particles make up the center of an atom?
A) only protons
B) only electrons
C)protons and neutronD)neutrons and electrons
Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs 306.0 g. From this information, calculate the density of mercury
Answer:
The answer is 13.6 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass of mercury = 306 g
volume = 22.5 mL
The density is
[tex]density = \frac{306}{22.5} \\ [/tex]
We have the final answer as
13.6 g/mLHope this helps you
Answer:
13.6
Explanation:
A person weighs a different amount on other surfaces in space than they do on Earth because the gravitational pull of each surface is different than that of Earth. The table and graph show the weights of objects on Earth, Mars, and the Moon. Weight on Earth and Mars Weight on Earth, e 90 pounds 120 pounds 160 pounds Weight on Mars, a 36 pounds 48 pounds 64 pounds Weight on Earth and Moon A graph has weight on earth (pounds) on the x-axis, and weight on moon (pounds) on the y-axis. A line goes through points (60, 10) and (120, 20). If a person weighs 240 pounds on Earth, what would be the difference in weight of the same person on Mars and on the Moon (based on the table and graph)? The person weighs 56 pounds more on Mars than on the Moon. The person weighs 56 pounds more on the Moon than on Mars. The person weighs 560 pounds more on Mars than on the Moon. The person weighs 560 pounds more on the Moon than on Mars.
Answer:
A
Explanation:
Answer:
A-The person weighs 56 pounds more on Mars than on the Moon
Explanation:
Just did the test
A lithium atom contains 3 protons, 4 neutrons and 3 electrons. What would be formed if one proton is added to this atom?
what do i do if me mum is a karen
Answer:
you gotta call her manager dead or alive
when chemical w is added to a liquid is it a compund or a element
Element
itll turn it in to an elment as the chemicals formin te liquidh
______ and _____ are found in the nucleus
Answer:
B
Both protons and electrons are found in the nucleus. There are not always an even number, but both still exist. The answer is B. Hope it helps!
Answer:
Protons and Neutrons are found in the nucleus
Explanation:
Any environmental concerns about the use of flerovium
Answer: contributes to greenhouse gasses, can kill plants and animals when breathed in
Explanation:
The Essential part of Bohr’s Model is
Answer:The model states that electrons in atoms move in circular orbits around a central nucleus and can only orbit stably in certain fixed circular orbits at a discrete set of distances from the nucleus. These orbits are associated with definite energies and are also called energy shells or energy levels.
bohrs model and other models are really hard to understand but i hope this will help you!
Which elementforms a diatomic molecule with a molecular mass of 160 g.
156 g sample of steel has a volume of 20.0 mL. What is the density of the steel sample? a g/cm3 Your answer should be rounded to three significant figures. Do not include nits in your answer.
Answer:
The answer is
7.80Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass of metal = 156 g
Since 1 mL = 1 cm³
20 mL = 20 cm³
volume = 20 cm³
It's density is
[tex]density = \frac{156}{20} = \frac{39}{5} \\ [/tex]
We have the final answer as
7.80 g/cm³ to 3 significant figuresHope this helps you
Answer:
7.8g/cm³
Explanation:
Formula is [ d = m/v ] where m = mass and v = volume.
We are given both "m" and "v" so we can solve for the density.
d = 156/20
d = 7.8
Best of Luck!
Anyone knows this please help me
Ok so do you know the steps to do it if so post the steps and i can help you from there.
the speed of sound at 20°c in dry air is ___m/s.
Answer:
343 meters per second
Explanation:
In SI units with dry air at 20°C (68°F), the speed of sound c is 343 meters per second (m/s). per hour (mi/h or mph), 12.79 miles per minute (mi/min), 0.2131 miles per second (mi/s), That is 0.343 kilometers per second (km/s), or 20.58 kilometers per minute (km/min).
3. Think of some examples
of situations in which
you shouldn't use the
height of an object above
the ground to calculate its
gravitational potential
energy
Does cool air push warm air upward?
Answer:
Cooler, denser air flows in underneath the warmer, less dense air, and pushes the warmer air upward. When this air cools, it becomes more dense than the warmer air beneath it. The cooled air sinks and moves under the warmer air.
Answer
Hot air is less dense than cold air, which is why hot air rises and cold air sinks, according to the United States Department of Energy. Hot and cold air currents power the weather systems on earth. The sun plays a major role in heating the planet, which also creates hot and cold air energy systems. Warm air currents typically bring rain, because they form over oceans. That’s why hurricanes and tropical storms form at sea and eventually move toward land.
How does a calorimeter follow the Law of Conservation of Energy?
It is based on the law of conservation of energy, which says that energy is neither created nor destroyed during a chemical reaction. In calorimetry, this means that the heat gained by the water in the calorimeter must have been released by the sample or the reaction taking place in the calorimeter
What is the density of an object with a mass of 180 grams and a volume of 45 cm3?
Plz answer fast
Answer:
4g/cm^3
Explanation:
The formula for density is mass divided by volume. 180g is your mass, 45cm^3 is your volume, divide the two to get your answer.
The density of an object with a mass of 180 grams and a volume of 45 cm is 0.4 kg/m.
What is density?The measure of the matter is mass. Density and volume can be multiplied to determine the mass. Determining how tightly something is packed. It has such a definition since it is the mass per unit volume.
Volume is the area that a thing takes up. If you weigh two liquids with identical quantities or amounts, the heavier liquid is denser. When gently introduced to the water's surface, a substance that is less thick than water will float.
So the formula will be d = m / v
The mass of the object is 180 g
The volume of the object is 45 cm
Putting the value in the formula
d = 180 g / 45 cm = 0.4 kg/m
Thus, the density of an object will be 0.4 kg/m.
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1. How many sublevels are in the following principal energy levels?
a. n=1
b. n=2
c. n=3
d. n=4
e, n=5
f. n=6
Explanation:
a 1 ( only "s"
b 2 ( "s" ,"p" )
c 3 ( "s" , "p" , "d")
d 4 ( "s", "p" , "d", "f")
e 5 ( "s", "p", "d", "f", "g")
f 6 ( "s", "p", "d", "f", "g", "h" )
The number of atoms of any element in the given chemical formula is the number that is written on the food of the symbol of that element. Therefore, sublevels are present in the principal energy levels.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.
Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus.
principal energy levels sublevels
1 s
2 s,p
3 s,p,d
4 s,p,d,f
5 s,p,d,f,g
6 s,p,d,f,g,h
Therefore, sublevels are present in the principal energy levels.
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Please help! I’m begging youuuuuuuuuuuuuuu
The table lists human organs and their functions
Human organ
skeleton
heart
Jungs
brain
Function
gives shape and aids movement
pumps blood around the body
interprets messages
Which phrase correctly completes the chart?
A pumps blood from the lungs to body parts
provides oxygen to the blood
provides a ngid support system
D controls how internal organs function
provides oxygen to the blood
what are 4 physical properties of Copper wire?
Answer:
Malleable, Conductive, Lustre and Ductile
Answer: 1-it is solid, 2- it is orangish red, 3- it can be bent and 4-is M.P is very high
Explanation:
Something that is mallleable is a hard b bendable c smooth d rigid
Answer:
A bendable
Explanation:
I got 100 on that test
how many protons are in each of the following
carbon has 6 protons and hydrogen has 1 proton
(8.6B) Speed, Velocity, and Acceleration:Question 1 What two factors are needed in order to compute the speed of a car? Select one:
A speed and acceleration
B:acceleration and time
c:speed and distance
D:distance and time
Answer:
D: distance and time
Explanation:
The formula for velocity (or speed) is calculated by dividing distance by time.
For example, if the distance is 100 ft in 2 seconds, the speed of a car is 50 ft/sec.
number 5 plz! what ideas do you have about why there are patterns in earthquake and valcano data?
Answer:
Explanation:
The interaction along plate boundaries results in an increased frequency of earthquakes at those locations. ... Additionally, stronger earthquakes are more likely to occur along active plate boundaries. Strong earthquakes are more common at transform and convergent plate boundaries.
