Answer:
Endothermic reaction
Explanation:
Endothermic reactions take in energy from the surroundings.
Energy is a reactant in endothermic reactions, and the temperature of the surroundings will decrease because it took in energy.
what do they all have the same of ?
Answer:
Same # of protons.
Explanation:
It's right cuz I took the test like last year and I still remember the answer
Which of the following is equivalent to 3.2 mg?
a
3.2 x 10-15 ug
b 3.2 x 1015 ug
С
3.2 x 10-3 ug
d
3.2 x 10'ug
Answer:
The options are not really clear, however, the answer is 3.2 × 10^3ug
Explanation:
Milligram (mg) and microgram (ug) are interconvertible measurements of mass or weight. One microgram (ug) is a millionth gram while one milligram (mg) is a thousandth gram.
Hence, one milligram is a thousandth microgram i.e. 1 mg = 1000 ug
Therefore, a measurement of 3.2mg in ug will be; 3.2 × 1000
= 3200
= 3.2 × 10^3 ug
Hence, an equivalent measurement of 3.2mg is 3.2 × 10^3ug.
If you find the mass of a sample to be 42.1 g and the actual mass is 42.0 g. your percent error would be what?
Answer:
0.24%
Explanation:
To find the percent error, first subtract the actual value by the expected value. You can ignore the sign of the difference.
42.0 - 42.1 = -0.1 = 0.1
Divide the difference by the expected value and multiply by 100%.
0.1/42.1 = 0.0024 × 100% = 0.24%
The percent error is 0.24%.
How many moles is 50g of CaCO3?
[tex]\huge\underline\mathbb\pink{♡Your Answer♡}[/tex]
Formula mass of CaCO3 is
40 + 12 + 3-100amu....
100g CaCO3 = 1 mole..
50g of CaCO3 = 1÷ 100x 5 = 0.5mole...
Hence ,answer is 0.5mole...[tex]<marquee direction="left" scrollamount=10><font color=purple>[/tex]
Hope it helps you..
Thanks...
What is the density of a 234 g sample with a volume of 22 mL?
Answer: 10.63
Explanation: You divide the mass by volume.
Answer:
10.64g/cm³
Explanation:
1cm³ = 1ml
22 × 1cm³ = 22cm³
Density = Mass ÷ Volume
234 ÷ 22
Density = 10.64g/cm³ or 10640kg/m³
How do electrons of an element determine that element's reactivity?
Answer:
The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.
Explanation:
John Fang has 5 apples, Jonny ate 3, how many are left!
Key Concepts
Choose the letter of the best answer.
1. Which description defines pseudoscience?
A. process of investigation that resembles science and follows scientific methods
B. process of investigation that resembles science but does not follow scientific methods
C. process of investigation that does not resemble science but follows scientific methods
D. process of investigation that does not resemble science and does not follow scientific methods
Answer:
A
Explanation:
Identify the biotic factors in the picture.
A)Deer
B)Rocks
C)Water
D)Grass
Help me plz l
Describe how the Buchner funnel was used to filter the ocean water. What went through the
filter?
Answer:
ya um i though i know it
Explanation:
how to Convert 2.00 miles to fathoms?
Answer:
1,760
Explanation:
There are 880 fathoms in a mile. To convert miles to fathoms, multiply the mile value by 880.
So, 2.00 × 880 = 1,760
An organic chemistry student is experimentally determining the melting point of fluorenone. The experimental melting points are listed below from a to e. Which one should he discard so that he can say his data is precise?a. 83.5 °C.
b. 85.6 °C.
c. 83.6 °C.
d. 83.4 °C.
e. 83.3 °C.
Answer:
To say his data is precise, he has to discard option b - 85.6 degrees Celsius
Explanation:
During laboratory experiments, the precision of a result data covers the sameness of the data generated or results got each time the experiment is performed.
For the results to be seen as precise, the temperatures recorded during each experiment should be the same, or really close to each other.
Judging based on that, option B does not fit in as it is quite different from the other results by about 2 degrees Celsius. It also indicates that some errors may have occurred during the experiment.
To say his data is precise, he has to discard option b - 85.6 degrees Celsius.
The other temperatures recorded are close to each other. This would now make the data precise.
5.25 calories are absorbed by an iron nail. How many joules is this?
a) 1.07
b) 9.43
c) 12.6
d) 21.9
* I NEED EXPLANATION!!! *
Answer:
D) 21.9
Explanation:
1 kilocalorie is equal to 4184 joules
0.001 kilocalorie is equal to 1 calorie
so 5.25 calorie=21.966 joules
What is the problem with mental models?
Mental models also guide your perception and behavior. They are the thinking tools that you use to understand life, make decisions, and solve problems. Learning a new mental model gives you a new way to see the world—like Richard Feynman learning a new math technique. Mental models are imperfect, but useful.
hope this helped :)
Which of the following observations NOT likely describes a chemical change? a A white solid was exposed to ultraviolet light and turned brown. b Two clear liquids were mixed together and a yellow solid formed c A solid was added to water and the mixture was stirred until the solid was no longer visible d A piece of metal was added to a liquid and bubbles formed on the surface of the metal
Answer:
The correct answer would be - c. A solid was added to water and the mixture was stirred until the solid was no longer visible
Explanation:
Photostabalizing is the process where a solid change its color in the presence of ultraviolet light, it is a chemical change, so the first option would not be the correct answer.
when two liquid or aqueous solutions are mixed together and form a solid substance, this reaction is known as precipitation and it is a chemical reaction too.
When a solid is placed in a liquid and after stirring it makes the solid vanish is a physical change known as dissolving character.
Thus, the correct answer is option C.
The expression “like a ton of bricks” means “very hard.” Would being hit by an actual ton of bricks hurt if it happened on the moon? A. Yes, it would hurt because the bricks would still have the same weight B. No, it would not hurt as much because the bricks would have less weight C. Yes, it would hurt because the bricks would still have the same mass D. No, it would not hurt as much because the bricks would have less mass.
Answer:
The correct option is;
C. Yes, it would hurt because the bricks would still have the same mass
Explanation:
Given that the expression "like a ton of brick" refers to the tendency of an object being crushed by another object, which is due to the impact of the force, and from Newton's law a force is proportional to the rate of change of momentum produced, therefor if the brick of the same mass is given the same velocity as it had on the Earth while the person remains stationary, it will hurt if the brick hits the person.
Which of the following is an example of a crystalline solid?
O A. Rubber
O B. Plastic
C. Diamond
O D. Glass
Negative and positive ions alternate in the ionic crystals. For instance, the melting point of calcium fluoride (CaF[tex]_2[/tex]) is 1418 °C. Therefore, the correct option is option C.
What is Crystalline Solid?The description of crystalline solid states that it is a substance whose atoms or even subatomic particles are organized in a highly structured form. Atomic nuclei in metallic crystals are surrounded by a "sea" of delocalized electrons.
Molecules of many types make up molecular crystals. Atoms that are covalently bound to one another make up covalent network crystals. Jewelry is crafted with diamond. Quartz is used to create things like watches and wall clocks. Among all the given options diamond is the only compound which is Crystalline Solid.
Therefore, the correct option is option C.
To learn more about Crystalline Solid, here:
https://brainly.com/question/28274778
#SPJ2
The chemical formula for glucose is C6H1206. How many different elements make up one
molecule of glucose?
Answer:
3 different elements make up Glucose
Explanation:
C = Carbon ( *6 )
H = Hydrogen ( *12 )
O = Oxygen ( *6 )
How many calories are absorbed by a copper spoon with a mass of 200 grams as it changes from 28°C to 33°C?
a) 0.00027
b) 3
c) 90
d) 13,000
Answer:
c) 90
Explanation:
Answer:
C
Explanation:
The amount of heat required to increase temperature by Δ T of an object with mass m and specific heat s is given by Q = m s Δ T . For copper specific heat s = 0.09 c a l / go C
Describe the changes in energy that occur when a marshmallow is burned over a fire?
Answer:
When marshmallows are toasted, a chemical change occurs. The sugar molecules in the marshmallow are being changed into carbon (1). Sugar can be changed into water molecules. ... The flame on stage - oxygen diffuses to the surface of the marshmallow from the surrounding air.
what are the three different type of solution?explain them.
Answer:
Click at the above pic and the ans will appear.
Hope it helps :)
If the mass of an object stays the same but its volume decreases, will the density increase or decrease?
Answer:
Increase
Explanation:
Density = Mass ÷ Volume
Let the mass be 100 for instance and the original volume to be 4.
100 ÷ 4 = 25
The new volume let it be 2.
100 ÷ 2 = 50
50 is more than 25 so the density increases
What is 0.0000000652 in scientific notation?
Answer:
it denotes 6.52× 10⁸ in scientific notation
Where is the most energy transferred in a food web?
a
From decomposer to secondary consumer
b
From producer to primary consumer
c
From primary consumer to secondary consumer
d
From secondary consumer to primary consumer
Explanation:
from producer to primary consumer is the correct answer of this question
Answer:
The answer is B.
Explanation:
"From producer to primary consumer"
Have a nice day, and keep dreaming <3
Plz helppppp
A graduated cylinder contains exactly 40 mL of water. A rock was dropped into the
cylinder of water. The water level rose to 52 ml. What is the volume of the rock?
Explanation:
first of all you should know that
1 ml = 1 cm³
therefore
increase in volume after putting stone=∆volume
= 52 - 40
= 12 ml
= 12 cm^3
therefore volume of the rock= change in volume= 12cm^3
The volume of the rock dropped into a cylinder containing 40 mL of water is 12 mL.
From the question given above, the following data were obtained:
Volume of water = 40 mL
Volume of water + rock = 52 mL
Volume of rock =?The volume of the rock can be obtained as follow:
Volume of rock = (Volume of water + rock) – (Volume of water)
Volume of rock = 52 – 40
Volume of rock = 12 mLThus, the volume of the rock is 12 mL.
Learn more: https://brainly.com/question/2058404
define a primary source and secondary source
Answer:
primary source: documents the result of original researche.
: is written by those who have conducted researche.
: includes firsthand information about their methodologies, data, results or conclusions.
Secondary source: summarizes, compares, critiques or interprets the primary source.
Explanation:
Primary source is the research articles published in scholarly, peer reviewed journal.
Secondary source is the summarises, critiques or interpretations of primary source.
i need famous invention from the last 200 years
Answer:
ancient Egyptian event lighthouses including the huge lighthouse of Alexandria
Explanation:
-250 BCE
why is nuclear fision relevant?
Answer:
nuclear vision provides energy for nuclear power and drives the explosion of nuclear weapons both uses are possible because certain substances called nuclear fuels undergo visions when struck by fishing neutrons and turned into emit neutrons when they break apart
Explanation:
I remember taking this test and seen this on the test and it was correct
Can somebody help me with this it is a science question part #2 ( can you also check my other questions to see if you can answer them).
Answer:
given is 7200 km in 9 hours, formula is s=d/t, work is 7200/9, answer is 800km/h
A teacher is preparing the materials list for an activity that all 6th graders will
complete. Each student will create a scale model of the planets in Earth's solar
system. A student will need 2,250 mg of clay to create a model of Mercury.
What two conversion factors will the teacher need to use in determining how
many kilograms of clay to order?
Answer:
There are 1000 mg in 1. g
There are 1000 g in 1 kg
Each students needs 2,250 mg of clay
Explanation:
In order to determine the amount of how many kilograms to order, the teacher will need to find out the total mass of clay required by the students and then the teacher will have to convert the total mass to the units required for the purchase.
The teacher would have to find out how many milligrams make one kilogram as follows
1 kg = 1000 g
1 g = 1000 mg
Therefore, 2,250 mg = 2250/1000 g = 2.25 g
2.25 g = 2.25/1000 kg = 0.00225 kg.