Answer:
B
Explanation:
a chemical change is where two chemicals come in to create a new chemical
Answer:
A change in a substance with no new substances being formed
Explanation:
you're welcome
n
Question 2
2 pts
(02.03 MC)
John writes a definition for speed and time,
Speed: Speed is the distance an object moves in an amount of time
Time: The amount of time is measured in seconds, minutes, or hours
Which statement is correct about John's definitions? (2 points)
Both definitions are incorrect.
Both definitions are correct.
The definition for speed is correct, the definition for time is incorrect.
The definition for time is correct, the definition for speed is incorrect.
Answer:
yes
Explanation:
the definition for time is correct, the definition for speed is incorrect
A student heats a 2.5 g sample of calcium carbonate in a test tube. What mass of calcium oxide remains in the test tube when the reaction is complete?
CaCO3(s) = CaO(s) + CO2(g)
Select one:
a. 1.4 g CaO
b. 2.1 g CaO
c. 2.5 g CaO
d. 1.0 g CaO
Answer:
1.4 g CaO
Explanation:
Given data:
Mass of calcium carbonate = 2.5 g
Mass of Cao remain in tube = ?
Solution:
Chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of CaO:
Number of moles = mass/molar mass
Number of moles = 2.5 g/ 100 g/mol
Number of moles = 0.025 mol
now we will compare the moles of CaO with CaCO₃.
CaCO₃ : CaO
1 : 1
0.025 : 0.025
Mass of CaO:
Mass = number of moles × molar mass
Mass = 0.025 mol × 56 g/mol
Mass = 1.4 g
Answer:
1.4g CaO
Explanation:
Did the exam and got it right. Hope this helps
PLEASE HELP ME!!
Which shows three human body parts in order from the simplest level of organization to the most complex?
A. red blood cell → nervous system → bone tissue
B. nervous system → bone tissue → red blood cell
C. red blood cell → heart tissue → circulatory system
D. bone tissue → red blood cell → nervous system
Answer:
C
Explanation:
C. red blood cell → heart tissue → circulatory system
the order of organisation is
cell --> tissue --> organ --> organ system --> organism
hope this hepls x
branilest plz?
Answer:
C is the answer
the red blood cell are a part of the heart tissue which makes up the circulatory system
If 0.20 bushel is 1 dozen apples and a dozen apples has a mass of 2.0 kg, what is the mass of 0.50 bushel of apples?
Answer:
Mass of 0.50 bushel = 5 Kg
Explanation:
Given data:
Number of apples in 0.20 bushel = 1 dozen
Mass of 1 dozen apple = 2.0 Kg
Mass of 0.50 bushel apple = ?
Solution:
First of all we will calculate the number of dozen of apple in 0.50 bushel.
(1/0.20) ×0.50 = 2.5 dozen
Mass of 0.50 bushel = 2.5 dozen × 2.0 Kg/1 dozen
Mass of 0.50 bushel = 5 Kg
Calculate the percentage composition of a hypothetical compound, X2Y3. The molar mass of X is 4.53 g/mol and the molar mass of Y is 8.71 g/mol. Round both answers to whole numbers.
Answer:
Explanation: Don't let anyone bring you down you got this you matter, and rock!
Explain the role of family and friends in socialisation.
Explanation:
Family is usually considered to be the most important agent of socialization. They not only teach us how to care for ourselves, but also give us our first system of values, norms, and beliefs. ... Another agent of socialization that relates to school is our peer group.
Draw the Lewis structure for SO2. How
many single bonds, double bonds, triple
bonds, and unshared pairs of electrons are
on the central atom, in that order?
1. 3, 0, 0, 1
2. 2, 1, 0, 0
3. 4, 0, 0, 0
4. 1, 1, 0, 1
5. 0, 0, 1, 1
6. None of these
7. 0, 1, 1, 0
8. 2, 0, 0, 2
9. 0, 2, 0, 0
10. 1, 0, 1, 0
Answer:
It should be 9
Explanation:
That’s how I remember drawing them I took chemistry last year. Tell me if it’s good.
A molecule of __________ consists of two atoms of hydrogen and one atom of oxygen.
The chemical formula for water is __________.
Each hydrogen atom in a water molecule shares __________ valence electron(s) with the oxygen atom.
The chemical formula for carbon dioxide is __________.
The chemical formula CO represents the compound __________.
Atoms or ions in compounds are held together by chemical __________.
Three types of chemical bonds are covalent, ionic, and __________ bonds.
Answer:
WaterH2Oone pairCO2Carbon monoxide bondsmetallicAnswer:
A molecule of Water consists of two atoms of hydrogen and one atom of oxygen.
The chemical formula for water is H2O .
Each hydrogen atom in a water molecule shares one valence electron(s) with the oxygen atom.
The chemical formula for carbon dioxide is CO2 .
The chemical formula CO represents the compound carbon monoxide.
Atoms or ions in compounds are held together by chemical bond.
Three types of chemical bonds are covalent, ionic, and metallic bonds
The products in this reaction
A have the same properties as the reactants.
В.
have the same atom arrangement as the reactants.
С.
have different properties than the reactants.
D
have fewer atoms than the reactants.
Answer:
It’s either B or C:
В. have the same atom arrangement as the reactants.
С. have different properties than the reactants.
Explanation:
Sorry, I don’t know a lot about this topic :(
which example is a weak base?
ethyl alcohol, ammonia, potassium hydroxide or vinegar?
Answer:
potassium
Explanation:
b/c electronegativitu
What is the work done on an object moved a distance of 63 m with a force of 8.5 x 103
Newtons?
Answer:
5.355 × 10³ JoulesExplanation:
I just had this question on my test
which of the following is an example of an electromagnetic wave A. an ocean wave B. A sound wave C. A light wave D. A wave traveling along a rope
Answer:
Light waves
Explanation:
It isn't sound because it isn't infrared, involve electromagneticism, or light/radiation. An ocean wave is a literal wave of water, and a wave traveling along a rope is way off course. Choose a light wave. Also, brainliest would be nice. Glad to help
If the producers of the ecosystem below make 14,000 units of energy. How much energy would be available to the very top trophic level?
Answer:
1.4
Explanation took test
Which sentence contains a common allusion?
O A. The meeting became extremely tense.
OB. The meeting turned into Waterloo.
O C. The meeting was held in Chicago.
OD. The meeting proceeded despite obstacles.
Answer:
B
Explanation:
The sentence that is a common allusion is:
B. The meeting turned into Waterloo.
All the other choices are not considered as an allusion
What is an allusion?It is an inferred or roundabout reference to an individual, occasion, or thing or to a piece of another text. Most references rely upon the comprehension that there is a gathering of data that is shared by the essayist and the peruser consequently. the peruser will get the author's referent.
The example of common allusion from the instances given are:
The meeting turned into Waterloo.
Find more information about Allusion here:
brainly.com/question/2427003
Please select the word from the list that best fits the definition
Measured in grams of solute per gram of solution
concentration
solubility
Answer:
Solubility
Explanation:
Solubility units that incorporate units of solution include grams of solute per 100 grams of solution or grams of solute per liter of solution. Another way to express solubility is in moles of solute per liter of solution; this ratio is called "molarity."
What are the classifications of these compounds? Are they triglycerides?
Answer:
Yes they are triglycerides
Explanation:
Triglycerides are esters derived from glycerol and three fatty acids.
If we look at the structures closely, we will notice that the compounds are composed of glycerol and three fatty acids.
Hence the structures are triglycerides. The first structure is an unsaturated triglyceride while the second structure is a saturated triglyceride.
(?)Fe+(?)H20 - - -> (?)Fe3O4+(?)H2
Answer:
what is this question??
Which of the following reactants will generate products with a solution of phosphoric acid?
a
Al(s)
b
Cu(s)
c
Au(s)
d
Ag(s)
Answer:
A. Al(s)
Explanation:
Which statement is true about a reaction represented by a chemical equation that shows energy as a reactant?

A.
It absorbs energy.

B.
It releases energy.

C.
It is a replacement reaction.

D.
It is a combustion reaction.
You are planning on making punch and you would like to cool it with ice. At the store, there are 2 different one-pound bags of ice to choose from: one that contains large ice cubes one that contains small ice chips. You only want to purchase one bag of ice and will add the entire bag to the punch. Would one of the bags cool the punch at a faster rate? If so, which one and why? If not, why? Would one of the bags of ice cool the punch to a lower temperature? If so, which one and why? If not, why? (Not really a chem q, I didn't know what subject to put it in)
compound form of lithium and selenium
Answer:
Li2Se
Lithium selenide
Explanation:
0.025 millimeters is the same as how many liters?
Answer:
2.5e-5
Explanation:
please help ASAP it is maybe easy for you!!!
Answer:
the answer is C, 30g
Read the clues given below to classify an unknown organism.
Clue 1: A unicellular organism
Clue 2: Lives in the human body
What is the correct classification of the organism?
A. Domain Bacteria; Kingdom Eubacteria
B. Domain Archaea; Kingdom Eubacteria
C. Domain Bacteria; Kingdom Archaebacteria
D. Domain Archaea; Kingdom Archaebacteria
Answer:
c
Explanation:
bacteria can be a single cell and archaebacteria live in the human body
Answer:
c
Explanation:
According to Le Chatelier’s principle, which statement is true?
The equilibrium constant is unchanged by temperature changes.
The equilibrium constant changes with a change in temperature.
The equilibrium constant increases with the concentration of reactants.
The equilibrium constant decreases with the concentration of products.
As per Le Cha-tel-ier’s principle, the true statement should be option b. The equilibrium constant changes with a change in temperature.
What is Le Cha-tel-ier’s principle?It defined that if there is any changes in the temperature, pressure, volume, or concentration of a system so it should be leads into the opposing changes in the system for accomplishing a new equilibrium state.
Hence, we can conclude that As per Le Cha-tel-ier’s principle, the true statement should be option b. The equilibrium constant changes with a change in temperature.
Learn more about equilibrium here: https://brainly.com/question/24207087
Answer:
b
Explanation:
what are the things used in soap? are they good or bad to our skin?
Answer: Your skin is your largest organ—22 square feet on average— Cleansers and body washes—might actually be doing us more harm than good, but, unfortunately, it absorbs harmful chemicals we put on it, too.
Explanation: Some are bad like scented body wash and hair stuff. But unscented is WAY better than scented, I learned that the hard way...
elements have the same number of what when you move from the left of the periodic table to the right?
the structural formula for CF4 is
Answer:
PubChem CID 6393
Structure
Find Similar Structures
Chemical Safety
Compressed Gas
Laboratory Chemical Safety Summary (LCSS) Datasheet
Molecular Formula CF4
Molecular Weight
88.004 g/mol
Explanation:
SOMEONE PLEASE HELP QUICKLY
determine the number of charged particles in nucleus of calcium atom then deduce the number of electrons
NUCLEAR CHARGE (20+)
ATOMIC MASS (40 amu)
given the relative charge of a proton =1+\ m1nucleon=1amu
Answer:
detail is given below.
Explanation:
The charged particles of nucleus are protons while neutrons are neutral having no charge.
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons.
one proton contribute 1 amu to the total weight. There are 20 protons and 20 neutrons in Ca thus its atomic mass is 40 amu.
While the atomic number is 20.
Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container?
Complete Question:
Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container?
Group of answer choices
A. A chemical change started immediately and finished at eight minutes.
B. A non-chemical change started immediately and finished at eight minutes.
C. A chemical change occurred at four minutes.
D. A non-chemical change occurred at four minutes.
Answer:
A. A chemical change started immediately and finished at eight minutes.
Explanation:
A chemical reaction can be defined as the chemical process which typically involves the reaction between two or more chemical elements (substances) to form a new compound, through the rearrangement of the ionic or molecular structure of each chemical element.
This ultimately implies that, a chemical reaction is a chemical change that immediately starts when two or more molecules of a chemical element (substance) known as reactants are combined together to form a new product (compound).
In this scenario, Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. Thus, what this represent about the type of change happening in the container is that, a chemical change (from red to blue) started immediately and finished at eight minutes.