There are different ways to know if a statement is true. When questioned, the principal could say that open campus lunch was a contributing factor to student tardiness is true statement.
This is because as they took away open campus for lunch that was when the tardiness for students decreased.
A statement is true if what it stand in gap for the case, Example is The buses are always early” is only true if what it describes is the case. That is, if it is actually the case that the buses are often early.
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Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two different metals? Barium (Ba) is less reactive than calcium (Ca) because the valence electrons in calcium atoms are farther from the nuclei and harder to remove. Strontium (Sr) is more reactive than magnesium (Mg) because the valence electrons in strontium atoms are farther from the nuclei and harder to remove. Rubidium (Rb) is more reactive than sodium (Na) because the valence electrons in sodium atoms are closer to the nuclei and easier to remove. Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove.
plz answer asap
Answer:
Lithium (Li)
Explanation:
The periodic table is the representation of the elements. According to the table, Lithium is less reactive than potassium because of the valence electrons. Thus, option D is correct.
Why is lithium less reactive?Lithium and potassium both are elements arranged in the periodic table and are placed in the same group I. The atomic number of lithium is 3, while potassium is 19.
The reactivity depends on the atomic size of the element and increases when one moves down in a periodic group. In group I, lithium has a small size as valence electrons are closer to the nucleus and harder to remove.
On the other hand, potassium has a higher atomic number and a larger size making its valence electron to be located at a larger space making them get easily eliminated.
Therefore, lithium is less reactive than potassium.
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A construction company recently filled in a local pond to build new houses. During the following weeks, a local scientist noticed a decline in the mosquito population in the area. The scientist wants to conduct a study that will measure the change in the local mosquito population over a period of three months. Which research method would give the scientist the best data for conducting his study?
Answer:
a collection device in the area that counts the number of mosquitoes caught weekly
Explanation: just bcuz
dsses
Question 5 (1 point)
All of the following are steps in the scientific method except
developing a model based on experimental results.
b observing and recording data.
discarding data inconsistent with the hypothesis.
forming a hypothesis.
Is an apple seed a compound or a mixture?
Answer:
Compound
Explanation:
compound: Substance that is made up of more than one type of atom bonded together
mixture: a combination of two or more elements of compound which are not chemically bonded
In positive numbers less than 1, the zeros between the decimal point and a non-zero number are BLANK
significant
Answer:
Not significant
Explanation:
I just did the test
Most fire extinguishers found in public paces are what type?
Answer:
Dry Chemical Extinguishers
Explanation:
They are found in apartments,homes and any other place that you live.
What is the relationship of the number of valence electrons of neon and argon?
Explanation:
Valence electrons of Ne, Ar are the same = 8
because they are in VIIIA or inert gas
Which of the following is a chemical property? A. Boiling point B. Electrical conductivity C. Flammability D. Malleability
Answer:
c
Explanation:
The one that is chemical property is flammability. The correct option is C.
What are chemical properties?Chemical properties are those properties that do not change by changing the size or shape of the elements. They are the quality that can only be formed by altering a substance's chemical identity is referred to as a chemical property, and it can occur during or after a chemical reaction.
The main chemical properties are flammability, pH, toxicity, reactivity, etc. Flammability is a property of the burning of an element. If a substance burns quickly and readily, it is flammable. If a substance does not burn quickly and readily, it is called inflammable. Some substances are wood, methanol, etc.
Thus, the correct option is C. Flammability.
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WHERE DOES THE REST OF THE ENERGY (90%) GO?
Answer:
The rest of the energy is passed on as food to the next level of the food chain. The figure at the left shows energy flow in a simple food chain. Notice that at each level of the food chain, about 90% of the energy is lost in the form of heat.
Use the drop-down menus to determine which state of matter is described in each statement.
The atoms in a are closely packed, but able to slide past each other.
The atoms in a spread as far apart as possible.
A has a definite shape and volume.
The shape of a can change, but the volume is definite.
solid
liquid
gas
Answer:
The atoms in a liquid are closely packed, but able to slide past eachother.
The atoms in a gas spread as far apart as possible.
a solid has a definite shape and volume.
The shape of a liquid can change, but the volume is definite.
Answer:
The atoms in a LIQUID are closely packed, but able to slide past eachother.
The atoms in a GAS spread as far apart as possible.
a SOLID has a definite shape and volume.
The shape of a LIQUID can change, but the volume is definite.
Explanation:
I NEED HELP ASAP PLEASE
One slice of bread provides you with 50 nutritional calories of energy. If a 1-1b loaf of bread contains 18
slices, how many Joules of energy are obtained by eating 1.00 g of bread? (1 nutritional calorie equals 1 kcal
and 1 cal = 4.18 J)
Given :
Energy in one slice of bread , e = 50 kcal .
A 1- lb loaf of bread contains 18 slices .
1 cal = 4.18 J .
To Find :
How many Joules of energy are obtained by eating 1.00 g of bread .
Solution :
We know , 1 lb = 0.45 kg = 450 g .
So , mass of 1 slice bread in gram is :
[tex]m=\dfrac{450}{18}\\\\m=25 \ g[/tex]
So , 25 g bread contains 50 kcal of energy .
Energy in 1 g of bread is :
[tex]c=\dfrac{50}{25}\\\\c=2\ kcal[/tex]
Therefore , energy in joules is [tex]2\times 4.18\ J=8.36\ J[/tex] .
Hence , this is the required solution .
promoter doesn't initiate chemical reaction, why?
Answer:
A catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction. A catalyst will appear in the steps of a reaction mechanism, but it will not appear in the overall chemical reaction (as it is not a reactant or product).
what is the volume of 10 paper clips in ml
Answer:
10.000
Explanation:
How do I identify the mass of an atom
Explanation:
You multiply the atomic weight and I believe the protons.
If the mass of the first cube is 30 grams, what is the density?
Answer:
2kg/m3
Explanation:
weight /mass= 30kg
Volume= 15m3
Density=2kg/m3
What is the volume of a piece of gold that has a mass of 354grams and density of .2g/ml
Answer:
23.9
Explanation:
do the math boi
What volume is occupied by 0.25 moles of nitrogen gas at 273 K and 1.50 atm.
Answer:
3.74L
Explanation:
PV=nRT
V=nRT/P
= 0.25mol*0.0821LatmK^-1*273k/1.50atm
=3.74L
Luca see snow melting from a roof as the sun comes out. Later he notices that the melting snow froze into icicles during the cold night. How is energy related to these changes of state?
A. Thermal energy affects the difference in freezing points.
B. Thermal energy is absorbed during melting, and then is released as it freezes.
C. The amount of thermal energy absorbed is affected by low melting points.
D. Thermal energy flows from cold objects to hot objects as they freeze.
I’ll mark you brainliest
Answer:
the answer is A your welcome
6
X, Y and Z are all gases that behave ideally and react according to the equation shown.
X(g) + 2Y(g) → 2Z(9)
When 3.0 mol of X and 3.0 mol of Y are placed inside a container with a volume of 1.0 dmº, they
react to form the maximum amount of Z.
The final temperature of the reaction vessel is 120°C.
What is the final pressure inside the reaction vessel?
А
4.49 x 10 Pa
B
9.80 x 106 Pa
C
1.47 x 10' Pa
D
1.96 x 10' Pa
Answer:
D
Explanation:
PV=nRT
n=nx + my
n=3mol+3mol
n=6mol
T=120+273=393K
P=nRT/V
P=6×0.0821×393/1
P=193atm
1atm=1.01325×10^5Pa
193atm=xPa
x=1.96×10^7Pa
3) (4.5 x 10-14) x (5.2 x 103) = ?
Answer:
16603.6
Explanation:
(4.5 x 10 -14) x (5.2 x 103)
(45 - 14) x (535.6)
31 x 535.6
16603.6
help meeee!
3874 dkg = _____ dg
Answer:
the answer is 387400 but I might be wrong
Which of the following is the smallest level of organization?
Select one:
tissue
organ
cell
organ system?
Answer:
Cell
Explanation:
Cells are the smallest level
What is photosynthesis
Answer:
the way plants eat
Explanation:
Answer:
The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
Those who practice a pseudoscience (e.g. astrology, biorhythms, etc.) are those who... do not claim to be scientific and do not follow the rules of science none of these. claim to be scientific, yet do not follow all the rules of science attempt to follow the rules of science, but make mistakes in the process
Answer:
claim to be scientific, yet do not follow all the rules of science
Explanation:
Pseudoscience as the name implies "pseudo=false" means false science. It is a practice which poses itself as being scientific but does not conform to scientific principles or methods. In other words, they claim to be scientific but in the actual sense, they are not because they do not follow the rules guiding scientific knowledge.
Examples of pseudoscience as stated in the question are astrology, biorhythms. These ideas or studies are not subject to principles that qualifies them to be scientific.
convert 175 lbs to kg
Sort the characteristics of solids, liquids, and gases into the correct columns.
atoms spread far apart
Solids
Liquids
Gases
atoms slide around
definite shape/volume
definite volume only
atoms vibrate in place
no definite shape/volume
What is a more modern device that measures mass?
Answer:
Digital scales /weight scales (the stuff you weigh yourself to see how much lbs you are)
Explanation:
Explain how to use a graph to show whether or not the speed of an object is constant.
Answer:
A horizontal line on a speed-time graph represents a constant speed. A sloping line on a speed-time graph represents an acceleration. The sloping line shows that the speed of the object is changing. The object is either speeding up or slowing down.
The compound formed has a(n) ___________ bond and is a(n) _________________
