Scientists Hydia, Christian, and Trynatie took 100 frogs. They kept 50 of the frogs at 35 degrees C. They kept 50 of the frogs at 25 degrees C. Then they measured how fast each frog's heart beat. What was changed or different BEFORE the experiment began?
Answer: Temperature was kept as an independent variable to observe the changes in the heart beat.
Explanation:
Independent variable can be defined as the variable which can be changed to induce change in an dependent variable which is the outcome of the experiment.
According to the given situation, the temperature in which the frogs were kept changed to observe the changes in the rate of heart functioning. So, the temperature is the independent variable which changed before the experiment began.
2. Which state of matter will take both the volume
and shape of the container that holds it?
A. gas
B. ice
C.liquid
D. Solid
Answer:
The answer would be C) a liquid.
Explanation:
If you were to pour a glass of water into a rectangular container, the water would fill up the container and be in the same shape as the container. That is becuase water flows and it doesn't harden up or take its own shape until it's frozen. The molecules are not tightly secure to each other so they are able to move freely.
If I have 7 electrons, 7 protons, and 7 neutrons what is my mass?
Answer:
14. The protons and neutrons count, but the electrons do not.
Explanation:
why water can be consider as an acid as well as base .explain briefly
Lithium is not nearly as abundant as sodium. If sodium ion batteries that function as lithium ion ones were developed, do you think sodium cobalt oxide would still work as the electrode material?
Answer:
No, sodium cobalt oxide would not work as the electrode material
Explanation:
Sodium is a much larger cation than lithium. Remember that ion size is a very important consideration when developing a battery. The ions to be substituted must be nearly of the same size if one ion is to replace the other in a crystal.
Since sodium ions are larger than lithium ions, sodium cobalt oxide would not work as the electrode material in Lithium ion batteries.
How many H2 and O2 molecules do you need to make exactly 4 water molecules with no leftovers?
The number of H2 and O2 molecules needed should be 4 and 2.
Calculation of the number of H2 and O2 molecules:We know that the water i.e. H2O that comprise of 2 hydrogen and 1 oxygen so in the case when we have to make 4 water molecules so it needed 8 hydrogen and 4 oxygen
So for H2 it needs 4 and for O2 it needs 2
Therefore, The number of H2 and O2 molecules needed should be 4 and 2.
Learn more about oxygen here: https://brainly.com/question/24136784
a flask that weighs 450g is filled with 145ml of benzene. the weight of the flask and benzene is found to be 754g. from this information, calculate the density of the benzene.
11/9/2020
Describe the types of possible
weathering that has occurred to
this boulder
Use vocab words to describe what
is happening
Example for next four problems:
Compound formula: MgCl2
Element: Mg
# of Atoms: 1
Element: Cl
# of Atoms: 2
gram formula weight (g): 95.21
Compound Formula: HCI
Element H
# of Atoms: (Options are 1, 2, and 3)
Element: CI
# of Atoms: (Options are 1, 2, and 3)
gram formula weight (g): (Options are 36, 36.46, and 36.50)
Answer:
Compound formula : HCl
Element H
# atoms:1
Elements Cl
#atoms : 1
gram formula weight (g) = 36.46
Which statement describes the blood type of a person with the alleles IAi?
It is type AB because I and i are codominant.
It is type AB because A and i are codominant.
It is type A because i is dominant and A is recessive.
It is type A because A is dominant and i is recessive.
Answer:
I answer this question I think I said the second one
Answer:
yep its the second one
Explanation:
What could happen if the chemists do not follow the exact formula for medications? (Give examples)
Answer:
qwe
Explanation:
wqe
ASAP pls help i'll give the brainliest
Answer:
B)
Explanation:
im in the middle of a chem test and i literally have no clue what is happening
Answer:
No question so I'm just taking the points
What mineral is used in paint and roofing, is nonmetallic, has cleavage, and a hardness of 2?
Answer:
Muscovite is the mineral
The radioactivity of U-235 is of low intensity. Why then were the people of Hiroshima exposed to high intensity radiation in the days and months after the atomic bomb was dropped?
Answer:
Explanation:
What occurred then is as a result of nuclear fission. This occurs as the Uranium-235 split into two smaller nuclei while releasing high energy neutrons. These neutrons bombard existing U-235 in the atmosphere and this reaction continue in a spontaneous manner until a chain reaction is formed of U-235, whose fall out fills the environment. This process was what led to people been exposed to high intensity radiation in the days and months after the atomic bomb was dropped.
A common characteristic shown by suspensions and colloids is:
the particles of both can pass through a filter paper.
the particles of both are visible to naked eye.
both are heterogeneous
the particles do not settle at the bottom under gravity.
What process is required for minerals to crystallize from magma
Answer:
Chemical differentiation
Explanation:
The process by which minerals crystallize out of magma is termed chemical differentiation. Some times, it is referred to as magmatic differentiation.
Minerals have different properties and at certain environment, it comfortable for the settle out of magma. Some minerals can crystallize out at very high temperature. Some will form at medium temperature whereas, some are low temperature minerals. Based on the properties of the minerals in a melt, a minerals will differentiate at various temperature and pressure regimes.Please answer it!! Would appreciate a lot!!
Answer:
1 acid
2 neutralization
3 H+ , OH-
4 metal
5 alkali
Iron is extracted from iron oxide in the Blast Furnace: Fe 2 O 3 + 3 CO → 2 Fe + 3 CO 2
a) Calculate the maximum theoretical mass of iron that can be made from 100g
of iron oxide.
b) In the reaction, only 65 g of iron was made. Calculate the percentage yield.
a. mass of iron = 69.92 g
b. percent yield = 93%
Further eplanationPercent yield is the compare of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
a.
Reaction
Fe₂O₃+3CO⇒2Fe+3CO₂
MW Fe₂O₃ : 159.69 g/mol
mol Fe₂O₃
[tex]\tt \dfrac{100}{159,69}=0.626[/tex]
mol Fe₂O₃ : mol Fe = 1 : 2
mol Fe :
[tex]\tt \dfrac{2}{1}\times 0.626=1.252[/tex]
mass of Fe(Ar=55.845 g/mol) :
[tex]\tt 1.252\times 55.845=69.92~g[/tex]
b.
actual yield = 65 g
theoretical yield = 69.92 g
percent yield :
[tex]\tt =\dfrac{65}{69.92}=0.93=93\%[/tex]
how does sustainable development support in a long term vision
Explanation:
meet .google .com/sxr-wgwg-vnc
Which best describes what is occurring when a door is almost closed and rays of light fan out from the small opening? absorption interference refraction diffraction
Answer:
The correct answer is Option D (diffraction).
Explanation:
Diffraction has been known as a mechanism through which light rays divide across clusters of darkness and light rather than into the colors of the rainbow. That is the twisting of such an obstacle across the sun. In this case, the challenge has been the door from which the illumination moves and bends.Other alternatives are not relevant to the specified case. So, the alternative above would be appropriate.
Answer: D
Diffraction
Explanation:
E D G E 2 0 2 0
Indicate the answer choice that best completes the statement or answers the question.
The crust and upper mantle make up Earth's
O a. lithosphere Ob. asthenosphere
O d. continents
Oc. core
Question 2
Question 3
Question 4
Question 5
Question 6
Question 7
Question 8
Question 9
Question 10
Question 11
Question 12
Question 13
Question 14
Question 15
Question 16
Question 17
Question 18
Question 19
Question 20
LO
Answer: lithosphere
Explanation:
continents are a part of lithosphere.
core is a structure of earth
answer asap correctly for brainleist and pls give the right answer thx!
A
Explanation:
B is wrong because it talks about speed, C is wrong because it talks about direction, and D is wrong because it talks about the amount of tilt. A is correct because it's the only one that talks about the time of the orbit and the time of orbit determines the length of a year. :)
A teacher attaches two slinky springs to a fixed support. The springs are moved, as shown in the image. Wave A wave B What property of the wave does the teacher change in the movement of each slinky? amplitude,frequency, speed, or wavelength
Answer:
a changes more because it going higher
Explanation:
Answer:
They will be the same because amplitude doesn't affect speed. A physics teacher attaches a slinky to the wall and begins introducing pulses with different wavelength. The denser the medium at the compression, the greater the amplitude of the wav
Explanation:
A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. The first indication that a chemical change was taking place could be observed when----
Answer:
Is when there is an increase in the temperature of the liquid
Explanation:
Increase in temperature of the liquid is an indication that chemical change occur because chemical change occur through process of chemical reaction and it involve when two or more substances combine together to form new substances which is as a result of change in chemical composition. The crystals dissolved in water to form another new solution and it became warm and this indicate a chemical change, new substances are formed as a result of increase in temperature.
Complete and balance each of the following equations for gas evolution reactions HCl(aq)+ZnS(s)>
2HCl(aq) + ZnS(s) ⇒ ZnCl₂(aq) + H₂S(g)
Further explanationEqualization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc. 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product 3. Select the coefficient of the substance with the most complex chemical formula equal to 1Reaction
HCl(aq) + ZnS(s) ⇒ ZnCl₂(aq) + H₂S(g)
1. give equation
aHCl(aq) + bZnS(s) ⇒ ZnCl₂(aq) + cH₂S(g)
2. make an equation
H, left=a, right=2c⇒a=2c(eq 1)
Cl, left=a, right=2⇒a=2⇒c=1(from eq 1)
Zn, left=b, right=1⇒b=1
So the equation :
2HCl(aq) + ZnS(s) ⇒ ZnCl₂(aq) + H₂S(g)
Plants and animals can build up or break down rock by increasing weathering, erosion, and
deposition. true or false
Answer:
false
Explanation:
Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering.
is this anwser correct
Answer:
Yes. It is definitely correct
How do I graph Charles's law equation?
Answer:
we needa see the equations
sulfur (S) = 32, and of oxygen (O) = 16.
8. The relative formula mass of a sulfate, ZSO
is 159.5. The relative atomic mass (A) of
What is the relative atomic mass
of element Z?
A
63.5
B 32.5
C 15.5
Answer:
It should be 115.5 amu but you didnt type that as an answer choice so...
Explanation:
Bruh all you had to do was add oxygen and sulfur and subtract from the total to get your answer :D.
