Answer:
Volume of the sulfuric acid (25cm³), same mass of each metal (1g)
Explanation:
In an experiment, the CONTROL VARIABLE also known as constant is the variable that is kept unchanged for all groups in an experiment. This is done in order not to influence the outcome of the experiment.
In this case, students are trying to investigate the reactivity of four different metals. They added 1 g of each metal to 25cm³ of sulfuric acid and recorded the temperature change. Based on the explanation of control variable above, the VOLUME OF SULFURIC ACID (25cm³) and the MASS OF EACH METAL (1g) are the CONTROL VARIABLES because they are the same or unchanged in this experiment.
Which statement describes a digital signal used to store information
Answer:
it is 1,4
Explanation:
Just took the test hope you get it right. c:
Answer:
It is made of numbers
Explanation:
Found the hard way.
Large amounts of an unknown compound were isolated from seawater. The compound contained 32.0 grams ofbromine and 4.9 grams of magnesium. What is its percent composition?
Answer:
87% bromine and 13% magnesium
Explanation:
The compound contained 32.0 grams of bromine and 4.9 grams of magnesium.
We need to find its percent composition.
Mass of the sample = mass of bromine + mass of magnesium
= 32 g + 4.9 g
= 36.9 g
Percentage composition of bromine,
[tex]\%=\dfrac{32}{36.9}\times 100\\\\=86.7\\\\=87\%[/tex]
The percentage composition of magnesium,
[tex]\%=\dfrac{4.9}{36.9}\times 100\\\\=13.27\\\\=13\%[/tex]
So, its percent composition is 87% bromine and 13% magnesium.
How do you measure density?
Density over mass
Mass over volume
Volume over density
Mass over density
Answer:
Mass over Volume........
What is the molar mass of carbon?
pleas HELP QUICK!!!!!!!!!!!!!!!!!
Answer: first is last second is first and 3rd is second
Explanation:
I am listing the order starting with new moon.
New Moon
Waxing Crescent
first quarter
waxing gibbous
full moon
waning gibbous
last quarter
waning crescent
and new moon again.
Answer:
new Moon.
waxing crescent Moon.
first quarter Moon.
waxing gibbous Moon.
full Moon.
waning gibbous Moon.
last quarter Moon.
waning crescent Moon.
New moon
Explanation:
Your answer is correct
The picture below shows the positions of the Earth, Moon, and Sun during an eclipse.
What is true of the eclipse shown in the picture?
A.
It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
B.
It is a solar eclipse, in which the Earth casts a shadow on the Moon.
C.
It is a lunar eclipse, in which the Moon casts a shadow on the Earth.
D.
It is a solar eclipse, in which the Moon casts a shadow on the Earth.
Answer:
it is option c liner eclipse
Answer:
A-It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
Which of the following is NOT a compound?
Table salt
Carbon dioxide
Water
Gold
Answer: Gold.
Explanation: Water, CO2, and table salt are compounds. They are composed of two or more separate elements; a mixture, where as gold is neither.
some students using Apple to represent the Earth what is the best reason to use an Apple for this comparison?
Answer:
The skin of the apple is very thin, and the crust of the Earth is very thin.
What is the percent by mass of Nitrogen in Mg(NO3)2?
Answer:
18.888%
Explanation:
How many atoms of beryllium are equal to 0.39 moles of beryllium?
Answer:
2.35 x 10²³atoms
Explanation:
Given parameters:
Number of moles of Be = 0.39moles
Unknown:
Number of atoms = ?
Solution:
To solve this problem:
1 mole of a substance contains 6.02 x 10²³ atoms
0.39 mole of Be will contain 0.39 x 6.02 x 10²³ = 2.35 x 10²³atoms
Applying a force for a longer time increases the change in
(select all that apply)
Weight
Gravity
Velocity
Mass
Momentum
Answer:
velocity and momentum
Explanation:
as you exert force, the object accelerates, hence, its velocity increases.
since momentum is mass times velocity, the momentum increases too
Please be reminded, this answer may not be 100% correct
When the force should be applied for a long time so it increases the change in velocity and momentum
What is velocity and momentum?The momentum of the object should be equivalent to the object mass times with the object velocity
Here
p = mv
Here p means momentum
m means mass
v means velocity
Here the momentum should be directly proportional to the mass of the object and for the velocity of the object also.
Learn more about mass here: https://brainly.com/question/1381544
How are gases and liquids different from each other
Answer:
Gases, liquids, and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. Gas is well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Explanation:
PLEASE HELP ADAP I WILL MARK AS BRAINLYEST
Answer:
c! Hope this helps!
Explanation:
BRAINLIEST PLZ ;)
Answer:
I think its the third one im not sure tho
Explanation:
a car is running with the velocity of 12 kilometre per hour what will be its velocity after 5 seconds if its acceleration is 2 metre
The velocity after 5 second =19 m/s
Further explanationGiven
Initial velocity =vi = 12 km/h=3.3 m/s
Time=t = 5 s
Acceleration=a = 2 m/s²
Required
Final velocity, vf
Solution
Motion with constant acceleration
Can be formulated :
vf=vi+at
Input the value :
vf=3.3+2.5
vf=9+10
vf=19 m/s
The discovery of protons and electrons most directly refuted or replaced the idea that
a. atoms contain a nucleus
b. the atom resembles plum pudding
c. the atom is electrically neutral
d. the atom is indivisible
Part 1
Observe the image of sodium. List the properties you see.
Part 2
Observe the image of hydrogen chloride. List the properties you see.
Answer:
Observable properties of sodium from the image:
1. It's slivery-white solid
2. It's shiny and bright
3. Looks soft
4. Looks waxy
Observable properties of hydrogen chloride from the image:
1. It is a colorless liquid
2. It is transparent
Explanation:
Sodium is known to be a metal that is silvery-white and waxy in appearance. The metal is bright and shiny especially when it is cut. It can be cut with a knife due to it soft nature. It is reactive and has low melting point. It actually reacts with water to form sodium hydroxide.
Hydrogen chloride (known to be hydrochloric acid) is a transparent and colorless substance. It is used in manufacturing plastics, textile, fertilizers, etc. The concentrated hydrogen chloride is very corrosive.
The above are what I can see from the image.
How many moles are in 8.63 x 103 atoms of Li?
1.43 × 10⁻²⁰ mol Li
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
8.63 × 10³ atoms Li
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 8.63 \cdot 10^3 \ atoms \ Li(\frac{1 \ mol \ Li}{6.022 \cdot 10^{23} \ atoms \ Li})[/tex]Multiply/Divide: [tex]\displaystyle 1.43355 \cdot 10^{-20} \ moles \ Li[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.43355 × 10⁻²⁰ mol Li ≈ 1.43 × 10⁻²⁰ mol Li
(Help if you know) What is one way land helps reduce the force of a hurricane as it moves inland?
A) land stabilizes the sediment forced on shore
B) Land filters the water forced up from the sea by the wind
C) Land acts as a bumpy surface that absorbs wind power
D) land absorbs the rainwater
A heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is a____. it for science class
what volume of a 6.0% W/V glucose (C6H6O6) solution can be prepared using 185g of glucose?
Volume of solution : = 3083.3 ml = 3.0833 L
Further explanationGiven
a 6.0% w/v
185 g of glucose
Required
Volume of solution
Solution
% w/v : the mass of solute in a volume of solution or 1 g solute in 100 ml of solution
Can be formulated :
% w/v = (mass solute(g) : volume solution(ml)) x 100
Mass of solute = mass of glucose = 185 g
The volume of solution :
= 185 g : 0.06
= 3083.3 ml
= 3.0833 L
Please Help Quick!!!
Lewis Structure of PO3 3-
1. Find its coordination figure/coordination number of central atom (CF)
Ev = Vallence electron of central atom
Σe = electrons donated from substituents
Terminal O gives 0 electrons, hence Σe = 3 x 0
charge = charge of the compound
2. Find EP (electron pairs) and LP (lone pairs)
LP = CF - EP
3. Draw the skeleton with octet substituents (top right figure)
4. Find formal charge for each atoms (Qf)
5. Write formal charge near atom in skeleton
6. Enjoy
How can you ensure the chemical reaction produces the right amount of heat in a hot pack without hurting you?
Answer:
Heat packs that contain iron and water packets: Exposing the solution to air results in the oxidation of the iron (creates rust). The oxidation of the iron is an exothermic process. Heat packs that contain supersaturated sodium acetate: These are reusable, the packs are boiled to dissolve sodium acetate.
Explanation:Thanks for asking question
Turning on your X-Box is an example of___ energy turning into ___ energy.
A.electrical,nuclear
B.nuclear,sound
C.electrical,light
D.electrical,chemical
Answer:
electrical --> light
Explanation:
If I have ten eggs and lots of milk, flour and oil, how many
crepes can I make?
Answer:
I'd say about 8?
Explanation:
if you wanna make them huge make about 6
According to the chemical formula shown below, all of the following elements are found in phosphoric acid EXCEPT
A. Hydrogen
B.Oxygen
C.Phosphorus
D.Potassium
Please asap i need help
Cynthia has 200kg of magnesium. Calculate how much MgCl2 she can make.
Mg + Cl2 = MgCl2
Answer:
784.4kg
Explanation:
Given parameters:
Mass of Mg = 200kg
Unknown:
Mass of MgCl₂ = ?
Solution:
The reaction equation is given as:
Mg + Cl₂ → MgCl₂
Find the number of moles of the given specie;
Number of moles of Mg = [tex]\frac{mass}{molar mass}[/tex] = [tex]\frac{200000}{24.3}[/tex] = 8230.5mole
So;
1 mole of Mg will produce 1 mole of MgCl₂
8230.5mole of Mg will produce 8230.5mole of MgCl₂
Mass of MgCl₂ = number of moles x molar mass
Molar mass of MgCl₂ = 24.3 + 2(35.5) = 95.3g/mol
Mass of MgCl₂ = 8230.5mole x 95.3g/mol = 784.4kg
In _____ , materials move from an area of higher concentration to an area of lower concentration through a cell membrane.
1.selective permeability
2.active transport
3.passive transport
A 1.0 kg ball is thrown into the air and initial velocity of 30 mi./s how high into the air did the ball travel
Answer:
45.9m
Explanation:
Given parameters:
Mass of the ball = 1kg
Initial velocity = 30m/s
Unknown:
Height the ball will travel = ?
Solution:
At the maximum height, the final velocity of the ball will be 0;
Using ;
V² = U² - 2gh
V is the final velocity
U is the initial velocity
g is the acceleration due to gravity
h is the height
0² = 30² - (2 x 9.8 x h)
0 = 900 - 19.6h
h = 45.9m
Fossils can be found all over the world, often in layered rock formations. To determine the age of the rock layers within an
area, geologists and paleontologists use a technique called radiometric dating. Determining the age of a rock layer allows
scientists to determine the age of the fossils within it.
Some of the more exciting fossil discoveries are of dinosaurs, which existed on Earth between 230 and 65 million years
ago. Examine this map e. Click the map to zoom in, and drag the magnifying glass for a closer look. The map shows
where prehistoric rocks formed during the Triassic, Jurassic, and Crustaceous time periods, the same periods when
dinosaurs walked on Earth. Based on the map, what is the closest location to you where dinosaurs are likely to have lived?
Answer: Western USA.
Answer:
the answer is the question itself
Explanation: