Answer:
Explanation:
-------Choices ---------------
Predict
Use variable
Plan and conduct investigations
Hypothesize
Measure
Classify and order
Record and display data
Use time and space relationships
Use numbers
=================
Selection:
These are in approximate order:
Hypothesize: Build an explanation of the observation. The hypothesis should be done after a thorough review of existing information. Library database searches and researcher interviews are suggested.Predict: prediction of what would happen if the explanation were correct. E.g., If an atom is homogenous and has no internal structure, then bombarding it with with neutrons will result in most neutrons going right through the atom, and none would be reflected backwards.Plan and conduct investigations: Design experiments that test the hypothesis. E.g., see if any neutrons are reflected backwards. If they are, the hypothesis needs to be changed.
Measure: Do the work. Calibrate the equipment and record everything.
Record and display data: Publish the results and conclusions for peer review. Seek other's input in order to generate general agreement that the data, procedure, and conclusions are warranted.
===
Use numbers? Nah. Not if they are not required to reach a conclusion.(e.g., the precipitate will be pink or the reaction will stink).
Use Time and Space Relationships: Yes, but only if the hypothesis depends on them.
Classify and Order: OK, especially if you are a biologist, but not always necessary.
Use variable: usually, but what and how depends on the experiment.
Blame: Place blame on the lab partner (Just kidding).
The number of electrons in the first three energy levels for four neutral elements is shown in the table. The element with the highest ionization energy is-
Answer:
The correct option is;
Element 2
Explanation:
The ionization energy is the energy required to eject an electron from a gaseous ion or atom
The ionization energy increases across the period and increases up the group
The elements with the highest ionization energy are those that have the complete octet structure in their outermost shell, which are the noble gases
Therefore, given that element 2, which has the complete octet structure in the outermost shell, then it is an element of the noble gases which have the highest ionization energy in a period, and therefore has the highest ionization energy.
On the periodic table, the element with 10 electrons is Neon, with ionization energy of 2080.68 kJ/mol which is the second highest after helium, that has only 2 electrons.
I need help what is the Find the value of x
Answer:
45 degrees
Explanation:
as you can see, the box in the corner states that both the angles together are 90 degrees, and half of that is 45. 90/2=45
Select all the correct answers.
Regina is testing this hypothesis:
Higher relative humidity leads to faster growth in orchids.
She has designed an experiment in which she will grow orchids in terrariums of varying humidity levels. She will then observe how the humidity affects the growth of the plants.
Which of the following variables are the confounding variables that Regina should control for before beginning her experiment?
1.the amount of sunlight the plants receive
2.the temperature at which the plants grow
3.the type of soil in which the plants grow
4.the growth rate of each of the plants
5.the relative humidity inside each terrarium
Answer:1,2,&3
Explanation:
four and five would not qualify as confounding variable‘s
the advantage of asexual reproduction is.
a. There are no genetic mutations
b. reproduction doesn't require a mate
c. increase genetic variation
Answer:
1.) Genetic Variation, 2.) reproduction doesn't require a mate.
Explanation:
These are the only two that actually make sense in the blanks, So trust me or trust the other two answers.Your choice.
C12H7Cl3FNaO2 what are them elements in that chemical formula
In which of the following physical states are the particles in constant motion?
1. Solid
II. Liquid
III. Gas (Vapor)
I and Ill only
O I. II and III
Oil and ill only
Ill only
Answer:
cgeh
Explanation:salamat
Why is hydrogen peroxide sold in opaque plastic bottles?
it's not a very stable compound
2) A student was working on an investigation to measure the relative activity
of an enzyme at various pH values. He collected the following data:
pH 2, enzyme activity 10; pH 8, enzyme activity 50;
pH 12, enzyme activity 10; pH 4, enzyme activity 20;
pH 6, enzyme activity 40; pH 10, enzyme activity 40
Answer:
THE LAST ONE
Explanation:
Examine the layers of rock. Identify and explain which layer contains the youngest fossils.
Earth layers with fossiles in each labeled top to bottom A to D.
Answer:
Layer A is the youngest
Explanation:
It is at the top, it has all of the dinosaur bones which got buried after earth got hit with an asteroid and they went extinct. Layer D started it and all of these years dirt, soil, and fossils have been gathering making each layer before older and older.
Two or more atoms that have been chemically combined are
called a
Answer:
compound
Explanation:
The relative formula mass (M) of a Group 2 metal carbonate is 197
Relative atomic masses (Ar): C = 12
O = 16
Calculate the relative atomic mass (Ar) of the Group 2 metal in the metal carbonate
Name the Group 2 metal.
The relative atomic mass (Ar) : 137 and the element : Ba
Further explanationThe naming of chemical compounds is giving a special name to a compound that aims to facilitate the classification of compounds and facilitate the identification of a compound. The rules for naming chemical compounds have been determined by the IUPAC (International Union of Pure and Applied Chemistry)
This nomenclature includes the naming of ion compounds, covalent compounds, and polyatomic
The molar mass of a compound is given by the sum of the relative atomic mass of Ar
M AxBy = (x.Ar A + y. Ar B)
Group 2 metals have a +2 charge : M²⁺
So the compound of metal carbonate : MCO₃
Ar C = 12, O = 16
M MCO₃ = (1.Ar M + 1. Ar C+ 3. Ar O)
[tex]\tt 197=1. Ar~M+1.12+3.16\\\\197=Ar~M+12+48\\\\Ar~M=137[/tex]
The element with relative atomic masses 137 is Ba
So the compound : BaCO₃
6. What is one way a star with much more mass than the sun can end up?
white dwarf
red giant
neutron star
red dwarf
Answer:
neutron star
Explanation:
A massive star (More massive than the star) will undergo a supernova explosion. If the remnant of the explosion is 1.4 to about 3 times as massive as our Sun, it will become a neutron star. The core of a massive star that has more than roughly 3 times the mass of our Sun after the explosion will do something quite different
how many grams of oxygen gas are produced when this sample is heated?
Answer: 2.92%
Explanation:
what best explains the cause of strong winds on a island?
Which particle changes to create a new element?
A.proton
B.neutron
C.electron
Answer: A
Explanation:
please help timed !! due today rn!!what does thermal equilibrium mean
PLEASE explain your answer!!!!
Answer:
Explanation: confusing
pure sodium and chlorine are extremely dangerous, but when combined the result in substance that we use every day. How do you think the properties of sodium and chlorine change when they are combined to make sodium chloride?
Answer:
Explanation:
chlorine has 7 valence electrons while sodium has 1. on their own, they are very reactive elements. a full valence electron shell has 8 electrons, so when elements combine and have 8 electrons in their outer shell, they are not reactive. when sodium and chlorine are combined to form sodium chloride (table salt), it is no longer dangerous. the number of valence electrons changes its reactivity and how it combines.
The properties of sodium and chlorine change when they are combined to make sodium chloride should be explained below.
Information regarding chlorine:chlorine comprises of 7 valence electrons while on other hand, sodium has 1. A full valence electron shell contains the 8 electrons, so when elements combine and have 8 electrons in their outer shell, they are not reactive.
learn more about substance here: https://brainly.com/question/19287431
what do you think would be a good science fair project for an 8th grade advanced class?
Answer:
maybe something about planets or the solar system and they have to make them
Explanation:
Answer:
create a rainbow of flames or build an infinty mirror
Explanation:
what is the electron configuration for gallium
Answer:
[Ar] 3d^104s^24p^1
The distinctive odor of vinegar is due to acetic acid, HC₂H₃O₂, which reacts with sodium hydroxide. If a 3.45 mL sample of vinegar needs 42.5 mL of 0.115 M NaOH to be neutralized, how many grams of acetic acid are in a 1.00 L bottle of this vinegar?
Answer:
Explanation:
CH₃COOH + NaOH = CH₃COONa + H₂O .
42.5 mL of .115 M of NaOH will contain .0425 x .115 moles of NaOH
= 48.875 x 10⁻⁴ moles NaOH
It will react with same number of moles of acetic acid
So number of moles of acetic acid in 3.45 mL = 48.875 x 10⁻⁴
number of moles of acetic acid in 1000 mL = 48.875 x 10⁻⁴ x 10³ / 3.45 moles
= 1.4167 moles
= 1.4167 x 60 gram
= 85 grams .
So 85 grams of acetic acid will be contained in one litre of acetic acid.
6. How is energy transferred to the earth?I
Answer:
Energy is transferred between the earths surface and atmosphere.Energy move place to place
How many atoms are present in 48.60 g ofMg
Answer: Explanation:
There are 6.02 x 10^23 atoms in 1 mol.
How many days will pass between a new moon and a full moon?
Answer:
30
Explanation:
im smart
Answer:
The longest duration between full moon to new moon (or new moon to full moon) lasts about 15 days and 14.5 hours, while the shortest duration between full moon to new moon (or new moon to full moon) lasts only about 13 days and 22.5 hours. New Moon appears higher on summer solstice than on winter solstice.
What measuring tool is used to find the volume of a shoe box?
A.water displacement
B.scale
C.beaker
D.ruler
Answer:
D. Ruler
Explanation:
Use the formula to find the volume of a cuboid by measuring the length, width, and height and multiplying all of them by each other.
Nuclear energy is currently used in which three kinds of vehicles?
Answer:
A. cars, submarines, spacecraft
Explanation:
I took the test.
Are the oldest rocks in the canyon found near the bottom
Answer: yes they are
Explanation:
because its so hot and the heat just stays at the bottom
Explain what a cold front is.
Answer:
A cold front is a boundary or zone that separates two air masses. The cooler more dense mass replaces the warmer.
hope this helps :)
Explanation:
Answer:
A cold front is a boundary or zone that separates two air masses. The cooler more dense mass replaces the warmer.
Explanation:
i am smart.....( i think )
A snicker bar has 300. Kcal, how many Joules of energy does it contain?
Answer:
1255200J
Explanation:
1 cal = 4.184 J
1kcal = 4184 J
thus, 300 kcal= 4184 × 300
= 1255200J
= 1255.2 kJ
= 1.2552 MJ
How does a cold trap catch pollutants in smog?
Answer:
A temperature inversion occurs when air near the ground is relatively cool, and there is a layer of warmer air above it. That upper layer of warm air keeps the cooler air from rising, and traps all of the pollution in the cooler, lower layer.
Explanation:
Hope this helps
Crown me as brainliest:)