Answer:
All of these examples are physical changes.
Explanation:
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition.
Mr. Bullis wants to know if he gives teachers candy, it will make them smile more. He gives half the teachers candy and the other half get nothing. He then records the number of times the teachers smiled.
Experimental Group:
Control Group:
Answer:
the experimental group would be the teachers who recieved the candy
control group would be the teachers who dont get any candy
Explanation:
experimental group is the group that receives the test variable being tested in this case the variable being the candy
and the control group is the group who doesn't receive the variable
purpose of having a control is to rule out other factors which may influence the results of an experiment.
An element that is in the same period as nitrogen is _________
Group of answer choices
helium
neon
argon
sodium
Answer:
Neon
Explanation:
Chemical element Chemical series Electron configuration
3 . Li -Lithium Alkali metal [He] 2s1
4 . Be-Beryllium Alkaline earth metal [He] 2s2
5. B -Boron Metalloid [He] 2s2 2p1
6. C-Carbon Reactive nonmetal [He] 2s2 2p2
7 . N -Nitrogen Reactive nonmetal [He] 2s2 2p3
8. O-Oxygen Reactive nonmetal [He] 2s2 2p4
9. F -Fluorine Reactive nonmetal [He] 2s2 2p5
10. Ne-Neon Noble gas [He] 2s2 2p6
Plz help!
Which elements form covalent bonds? Which other element is included in the group?
can you guys help me please? I dont get what im supposed to do here.
Question 1
Why can't wee see atoms?
Answer:
They're too small
Explanation:
Atoms are smaller than the wavelength of visible light
Answer:
too small
Explanation:
Do you think that participation in a Supervised Agriculture Experience (SAE) prepares a student for a career in the AFN industry? Discuss why you agree or why you don’t. Discuss how your particular SAE has prepared you for your future career.
HELPPPP !! For horticulture
Answer:
The SAE curriculum includes practical farming tasks conducted outside the scheduled classroom and laboratory period by students. SAEs offer a method for students in agricultural education to gain real-world work opportunities that they are most interested in in the field of agriculture. Supervised agricultural experience is an essential component of agricultural education, and all Agriculture, Food and Natural Resources (AFNR) courses are a necessary component.
Explanation: Hope it helps
Convert the following to Celsius
16) 100°K
17) 200°K
18) 273°K
19) 350°K
Answer:
16) -173.15cel
17)-73.15cel
18)-0.15
19)76.85
Explanation:
I converted kelvins to cel
Brainly pls
A plant's growth response to water is called _____.
hydrotropism
geotropism
gravitropism
thigmotropism
Answer:
A or Hydrotropism
Explanation:
Answer:
hydrotropism Explanation:
because hydro= water and topism= the turning part of an organism hope this helps!! <3
If a can of soup 150 g mass and 0.75g/ cm^3 density what’s the volume
Answer:
The answer is 200 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density}\\[/tex]
From the question
mass = 150 g
density = 0.75 g/cm³
We have
[tex]volume = \frac{150}{0.75} \\ [/tex]
We have the final answer as
200 cm³Hope this helps you
Which of the following neutral atom configurations satisfies the octet rule?
1s2 2s2 2p6 3s2 3p6
1s2 2s1
1s2 2s2 3s2 3p4
1s2 2s2 3s2 3p6 4s1
Answer:
2
Explanation:i did the test
The element found in Group 13, Period 2 is ______ a- Al b- Be c- B d- Mg
How many grams are in 1.98 x 1024 formula units of NaCl?
Answer:
There are 2027.52 formula units of NaCl
Explanation:
plz mark me brainlest
Which orbital indicated on the periodic table???
S
P
D
F
Help ASAP I’ll mark as brainlister:)
name two units for density? I need help!!!!
Answer:
Density is commonly expressed in units of grams per cubic centimetre. For example, the density of water is 1 gram per cubic centimetre, and Earth ’s density is 5.51 grams per cubic centimetre. Density can also be expressed as kilograms per cubic metre (in MKS or SI units). For example, the density of air is 1.2 kilograms per cubic metre.
Explanation:
what is the electron configuration for gallium
Answer:
[Ar] 3d^104s^24p^1
The mass of an atom Is found by adding Its protons and .The electric charge of an atom Is found by adding the charges carried by Its protons and .
Answer: the 1st answer is neutrons and i think the 2nd is nucleus
Explanation:
The mass of an atom is found by adding its protons and neutrons. The electric charge of an atom is found by adding the charges of its protons and electrons.
What is atomic mass?The atomic mass of an element is the total number of protons and the number of neutrons carried by one atom of that element. The atomic mass of an element is usually expressed in grams or a.m.u.
The atomic mass of an element = No. of protons + No. of neutrons
or
The atomic mass of an element = No. of electrons + No. of neutrons
The atomic number gives us information about how many protons are inside the nucleus of the atom. Elements are recognized by the number of protons in the nucleus. Neutrons are uncharged elementary or subatomic particles that are stable when bound in an atomic nucleus.
As the electrons and protons are charged particles in an atom, therefore, the sum of the charge carried by them is equal to the electrical charge of the atom.
For a neutral atom, the number of protons present in an atom is always equal to the number of electrons.
Learn more about atomic mass, here:
brainly.com/question/17067547
#SPJ5
What mass of water freezes if 5.43 kJ oh heat are released in the process
Answer:
16.3 g
Explanation:
got it right on ck
Which classification best describes oxygen gas? a element b compound c solution d heterogeneous mixture
Answer:
oxygen is an element because it is a pure substance which cannot be split into simpler substances by chemical means
A 2.3 kg object has 15 ) of kinetic energy. Calculate its speed.
O A. 0.12 m/s
OB. 1.1 m/s
O c. 2.4 m/s
OD. 3.6 m/s
Answer:
The answer is option DExplanation:
To find the speed given the kinetic energy and mass we use the formula
[tex]v = \sqrt{ \frac{2KE}{m} } \\ [/tex]
where
m is the mass
v is the speed
From the question
KE = 15 J
m = 2.3 kg
We have
[tex]v = \sqrt{ \frac{2 \times 15}{2.3} } = \sqrt{ \frac{30}{2.3} } \\ = 3.61157559...[/tex]
We have the final answer as
3.6 m/sHope this helps you
What does the speed of the mixing colors tell you about the speed of the
molecules in hot and cold water?
Which is a characteristic of nuclear fission? releases nonradioactive waste only involves the collision of two nuclei releases small amounts of energy compared to fossil fuels involves the splitting of an atom into two or more fragments
Answer:
involves the splitting of an atom into two or more fragments
Explanation:
The characteristic of nuclear fission is that it involves the splitting of an atom into two or more fragments. Details about nuclear fission can be found below.
What is nuclear fission?Nuclear fission in radioactivity is a process by which the nucleus of a large atom splits into two or more smaller atoms.
Nuclear fission is usually accompanied by the release of a radioactive particle.
This suggests that the characteristic of nuclear fission is that it involves the splitting of an atom into two or more fragments.
Learn more about nuclear fission at: https://brainly.com/question/913303
#SPJ2
The distance of the Kentucky Derby, a classic horse race, is 1.25 miles. How is this distance expressed in furlongs ?
A. Lithium and cadmium are in the mixture. Strontium is not in the mixture.B. Lithium and strontium are in the mixture. Cadmium is not in the mixture.C. Cadmium and strontium are in the mixture. Lithium is not in the mixture.D. All of the shown elements are present in the mixture.
Answer:
I think it's Sr and Li...
Explanation:
You just line up the elements to the mixture and whatever fits with all of the charts are the elements present in the mixture.
How many days does the waxing and waning phase of the moon last on average? *
Answer:
7.38 days.
Explanation:
A scientist thinks that ducks swim faster when they are in cold water. He tests two groups of ducks, one in cold water and one in room temperature water. He records how fast they swim.
Experimental Group:
Control Group:
If you put 8 protons and 8 neutrons, which element did you make?
oxygen
sulfur
berllium
gadolinium
Which statement best explains how the passage fits
the realistic fiction genre?
Answer:
It seems believable and familiar.
Explanation:
Plz mark Brainlest
HELP ME PLEASE!!
HELP!!!
Opportunity cost refers to:
A. the price of a good set by supply and demand in a market.
B. the inability of an economy to address all people's needs.
C. the lost chance to make one choice when another is made.
D. the economic motivation for a business to produce a good or
service.
SUBMIT
Answer:
C
Explanation:
Which of the models best represents CaCO3?
Answer: B
Explanation:
To solve this we must be knowing each and every concept related to CaCO[tex]_3[/tex]. Therefore, the correct option is option B among all the given options.
What is CaCO[tex]_3[/tex]?Carbonate of calcium One of the best-known compounds is CaCO[tex]_3[/tex]. Calcium carbonate is indeed a non-toxic, odorless substance. CaCO[tex]_3[/tex] is a white mineral found naturally in chalks, limestones, and marbles. It is a common material found in rocks as calcite and aragonite.
CaCO[tex]_3[/tex] is most commonly found in limestone. It is a sedimentary rock composed primarily of calcite and is the primary component of eggshells, snail shells, seashells, and pearls. Calcium carbonate is also used in medicine as a source of calcium or as an antacid. Although excessive calcium carbonate ingestion is dangerous and causes poor digestion.
Therefore, the correct option is option B.
To know more about CaCO[tex]_3[/tex], here:
https://brainly.com/question/28455207
#SPJ2
Convert 49 lbs into grams
To get an approximate result, multiply the mass value by 454.
hope this help!