Answer:
This question lacks options. The options are:
A. The two substances underwent a physical change
B. The two substances were melting
C. A new substance was forming
D. A change in the mass of the two substances
The answer is C
Explanation:
Changes in chemistry can either be physical or chemical. A physical change as the name implies does not alter the chemical content of the susbtances involved. However, chemical changes affect the chemical composition of the substances, hence, new substances are produced.
A chemical change is also characterized with a color change, temperature change, gas evolution etc. In this question, Mia mixed two substances in a test tube and noticed that the test tube became warm, gas came out from the test tube. This implies a CHEMICAL CHANGE, LEADING TO THE FORMATION OF NEW SUBSTANCES.
how many hydrogen(H) atoms are on the reactants side
A.2
B.6
C.12
D.6
Bubble wrap is made of a series of air pockets sealed in a sheet of plastic and is often used to protect fragile objects during shipping. Bubble wrap tends to pop when stepped onto or squeezed. How can you explain this using Boyle's law?
Answer:
Explanation:
Boyle's law states that at constant temperature:
P [tex]\alpha[/tex] [tex]\frac{1}{V}[/tex]
PV = constant
Where: P is the pressure of a given mass of gas, and V is its volume.
The bubble wrap has a confined volume of air at constant temperature. Since a gas is easily compressible, the volume of the gas in the wrap decreases with increasing pressure. This implies that there is an inverse proportion relation between the pressure on and volume of the air.
The bubble wrap pops when stepped onto or squeezed because the pressure is high and the volume can not be compressed further. Thus, the elastic limit of the seal is exceeded. This leads to an escape of the confined air.
PLEASE HELP!!!!!!!!!!
How does the words used in a text help the theme, setting, and plot?
8. Which of the following are reasons why Index fossils are chosen for determining ages of rocks? Select all that apply .
A Found commonly in rocks
B. Distributed over a very wide range
C. Are always dinosaurs
D. Limited life existence in geologic time.
Answer:
B. Distributed over a very wide range
D. Limited life existence in geologic time.
Explanation:
Index fossils are very unique fossils that helps in determining the relative ages of rocks and biostratigraphic correlation. They are usually called guide fossils.
Fossils are the preserved remains of dead organisms found in rocks. Index fossils are a special class of fossils with the following properties; They are widely distributed. They have a short stratigraphic range. They show rapid evolution trendsAnswer:
d and b
Explanation:
How many moles of hydrogen atoms are
present in 15 moles of C2H6O?
Answer in units of mol.
Air can be considered a ____________ of gaseous elements and compounds.
A) heterogeneous mixture
B) homogeneous mixture
C) colliodal solution
D) suspension
6.10 g of a solid chemical reacts with a 10 g of a liquid chemical, the
reaction bubbles and changes the color of the liquid. The colored liquid
weighs 13
g. what can be concluded? *
The gas produced from the bubbles weighed 5 g
The gas produced weighed 7 g
The gas produced weighed 13 9
The bubbles were evidence of 7 g of matter being destroyed
Other
Answer: True
Explanation:
Q. 10g of white powder reacts with 10g of clear liquid. The reaction bubbles and changes color producing a black liquid that has a mass of 13g. What can be ...
When 10 g of a solid chemical reacts with 10 g of a liquid chemical, the reaction bubbles and the liquid changes color. The coloured liquid has a weight of 13 g. This can be said. The produced gas weighed 7 g.
What is chemical reacts?A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. According to Wikipedia, a chemical reaction is a process in which one or more compounds, known as reactants, change into one or more other substances, known as products. Chemical elements or chemical compounds make up substances.When two or more molecules combine to create a new product, the process is known as a chemical reaction (s). Products, as opposed to reactants, are the compounds that result from an interaction between two other substancesChemical reactions are the process by which an existing chemical substance is changed into a different chemical substance by forming and breaking bonds between various atoms.To learn more about chemical reacts refer to:
https://brainly.com/question/11231920
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When is International coffee day?
Amir wants to change this model to represent a different isotope of oxygen How could he make this change?
А
add one green candy
B
rearrange the blue candies
C.
add one red candy
D
take away two blue candies
Answer:
Option A. Add one green candy
Explanation:
From the question given above, the following data were obtained:
Red color => Proton
Green => Neutron
Blue => Electron
Isotopy is a phenomenon where by two or more elements have the same atomic number by different mass number due to the difference in the neutron number. The atoms involved are called isotopes.
From the above definition, isotope exist when the neutron number of the atoms are different with each having same atomic number (i.e proton number).
Thus, considering the question and the options given above, the only way to make a different isotope of oxygen is to add a green candy (i.e neutron).
How many joules of energy are made by the loss of 100kg of mass using the formula E=mc2? please help!!!
Answer:
E = 3 × 10¹⁰ J
Explanation:
Mass, m = 100 kg
We need to find energy made by the loss of 100 kg of mass. The formula between the mass and energy is given by :
E = mc²
Where c is speed of light
Putting all the values, we get :
E = 100 kg × (3×10⁸ m/s)²
= 3 × 10¹⁰ J
So, the required energy is 3 × 10¹⁰ J.
If 3.3167 moles of Al are produced, how many moles of
AlCl3 were reacted?
I
Answer:
3.3167 moles Of AlCl3
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
3Ca + 2AlCl3 —> 3CaCl2 + 2Al
From the balanced equation above,
2 moles of AlCl3 reacted to produce 2 moles of Al.
Finally, we shall obtained the number of moles of AlCl3 that reacted to produce 3.3167 moles of Al as follow:
From the balanced equation above,
2 moles of AlCl3 reacted to produce 2 moles of Al.
Therefore, 3.3167 moles Of AlCl3 will also react to produce 3.3167 moles of Al.
Thus, 3.3167 moles Of AlCl3 is needed for the reaction.
How many electrons does Oxygen have?
Answer:
Easy.. 6 valence electrons
Answer:
I believe oxygen has 8 electrons.
Ahmed makes a Venn diagram to compare active transport and passive transport across the cell membrane.
Which label belongs in the region marked X?
Answer:
The labels are not given to represent but the correct answer would be one of these:
-Uses energy
- low concentration to high concentration movement
Explanation:
Active transport and passive transport both are transport methods of the molecules and substances in or out of the cell through the cell membrane. Passive and active transport has only one thing which is the movement of the substance through or across the cell membrane.
However, there are differences in these types of diffusion are:
Active Transport Passive Transport
-Uses energy - a form of diffusion
-Moves from low to high concentration - from high to low concentration
Answer:Is a form of diffusion
Explanation:Hopes this helps pls mark me brainliest if it does help
The nuclear symbol for uranium-235 should be written as
O U-235.
225
92 U
233
143U
OU
Answer:
²³⁵₉₂U
Explanation:
The right symbol for the nuclei is ²³⁵₉₂U;
For this chemical element, the atom is represented by the symbol U;
To the superscript before the symbol is the mass number
The subscript before the symbol is the atomic number
Mass number is the number of protons and neutrons
Atomic number is the number of protons.
Can someone write 3 complex sentences i really need some help thank you!!!:)
DUE TODAYYYY AT 10!!!!!1
Answer:
1.Because my coffee was too cold, I heated it in the microwave.
2. Although he was wealthy, he was still unhappy.
3. She returned the computer after she noticed it was damaged.
Explanation:
..
define mass number ??
the total number of protons and neutrons in a nucleus
Scientists believe that there are three genes that contribute to skin color in humans.
Which of these best describes the inheritance pattern of skin color?
multiple allele in which offspring receive three alleles from each parent
multiple allele in which offspring receive three alleles from only one parent
polygenic in which offspring receive three alleles from each parent
polygenic in which offspring receive three alleles from only one parent
Answer:B
Explanation:
I took the test
Answer:
b
Explanation:
bjdcbndjcf jvhbf its just b
15. The element lithium (Li) has an atomic mass of 3 and a mass number of 7.
Explain how you know that the diagram above represents a lithium atom.
What you already know:
C on this diagram is a proton and B points to the electron. A note the nucleus that contains the protons and the center of orbit to the electrons. D notes the electron cloud, radius, or the bounds to which the electron obitals exist.
Answer:
If you count the number of protons this atom has it adds up to 3, which, therefore comfirms that this molecule is Li. The number of protons is specific to the atom. The question states that this element has a mass number of 7, this is because the mass number is the sum of both protons and electrons.
please help man i’ll reward brainliest ✊
Answer:
gAIN
Explanation:
Which set of elements have the most similar chemical properties?
1. Potassium, Calcium, Scandium
2. Chromium, Cobalt, Copper
3. Nitrogen, Oxygen, Fluorine
4. Oxygen, Sulfur, Selenium
Answer:
4
Explanation:
Oxygen, Sulfur, Selenium
Spherical shaped bacteria are identified using the term
A. spirilla
B. cocci
Which of the following theories did these discoveries lead to?
Answer:
Explanation:
the discovery of microscopes
Answer: A . The cell theory
Explanation:
Marcie believes that she has found a piece of obsidian. What causes obsidian to form?
Answer:
Quick cooling of Lava
Explanation:
such as: Water being poured, or cold climate
Which of the following is a change in the earths surface caused by glaciers?
Are there any answer choices that go along with the question??
what is the happens in electrolysis if the electrolyte solidifies?
Answer: For example, if electricity is passed through molten lead bromide, the lead bromide is broken down to form lead and bromine. This is what happens during electrolysis: Positively charged ions move to the negative electrode during electrolysis. ... Negatively charged ions move to the positive electrode during electrolysis.
Explanation:
hope this helps you find what your looking for
which is the correct choice
i need all answerd please! this is all the points i have.
Answer:
give me more then I'll help
Explanation:
Answer:
1=4.684
2=97.013
3=41.5
4=7540
can somebody please help me with these I literally have no idea what it’s asking
Answer:
I believe it's copper
Explanation:
The reasoning being that Copper = 9.0 g/cm and the mystery item has 5.0 cm so 9*5 = 45 something like that
Ed records the temperature of two pots of water. Pot X has a temperature of 56 degrees Fahrenheit, and pot Y has a temperature of 49 degrees Fahrenheit. What conclusion can Ed make about the pots of water? The water in pot X has more kinetic energy than the water in pot Y. The water in pot Y has more kinetic energy that the water in pot X. The water in pot X has a higher specific heat than the water in pot Y. The water in pot Y has a higher specific heat than the water in pot X.
Answer:
A) The water in pot X has more kinetic energy than the water in pot Y.
Answer:
A is the answer
Explanation:
Using the diagram below, which rock layer is older than the Chinle Formation?
A.carmel formation
B. moenkopi formation
C. temple cap formation
D. dekota formation
Answer:
moenkopi formation because layers further down are always older. think about it as a pile of laundry the clothes at the bottom of the pile were worn earlier in the week and are older and dirtier.
Explanation:
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