As shown by the periodic table, why do the elements potassium and sodium have similar chemical properties?
If the ball is at rest on the soccer field and the four forces shown are applied at the same time, the ball will
А.
move to the left.
B. stay in the same position.
c. accelerate in the direction of the smallest force.
D. resist any change in movement.
Since the rightward force is greater than the leftward force by a magnitude of 10 Newton, the ball will: A. move to the left.
Given the following data:
Upward force = 50 Newton.Downward force = 50 Newton.Rightward force = 30 Newton.Leftward force = 40 Newton.A net force can be defined as the vector sum of all the forces acting on an object.
Hence, net force is the sum of all forces acting simultaneously on an object.
To determine the direction in which the ball would move if the four forces shown are applied at the same time:
For the downward and upward force:
[tex]Net\;force = 50-50\\\\Net\;force = 0\;Newton[/tex]
For the rightward and leftward force:
[tex]Net\;force = 40-30\\\\Net\;force = 10\;Newton[/tex]
Since the rightward force is greater than the leftward force by a magnitude of 10 Newton, the ball will move to the left.
Read more: https://brainly.com/question/22210180
3. Which of the following is an example of a polyatomic ion?
a. NO
b. OP-
C. CI
d. Ca²+
Answer:D
Explanation:polyatomic means more then one and it have more then 1 positive ion
I WILL DIE I HAVE A KNIFE IN MY HAND. ANSWER WITH EXPLANATION. If the sound is high pitched, then the wave's frequency would have a:
A.high frequency, short wavelength
B. high frequency, long wavelength
C. low frequency, long wavelength
D. low frequency, short wavelength
Answer:
A
Explanation:
High frequency, short wavelength
HELP IN 8TH GRADE ADV SCIENCE
Answer:
protons: 36
neutrons: 48
electrons: 36
Which substance is correctly identified as a homogeneous or heterogeneous mixture?
A. salad -- heterogeneous
B. milk --- heterogeneous
C. river water --- homogeneous
D. beach sand --- homogeneous
Answer:
A
Explanation:
A salad with lettuce, cheese, seeds, tomatoes, broccoli, and other vegetables is an example of a heterogeneous mixture.
Milk is not mixed with anything so that is incorrect
River water is mixed in with dirt and minerals so this one is incorrect
Beach sand is incorrect because you can see colored particles.
How many molecules of H2O are in 8.54 moles of H2O?
Select one:
a. 5.14 * 10^24 molecules H2O
b. 2.86 * 10^23 molecules H2O
c. 6.02 * 10^23 molecules H2O
d. 5.14 * 10^23 molecules H2O
Answer:
[tex]\boxed {\boxed {\sf A. \ About \ 5.14 *10^{24} \ molecules \ H_2O}}[/tex]
Explanation:
To convert from moles to units, we must use Avogadro's Number: 6.022 * 10²³
This tells us the number of units (molecules of water in this problem) in 1 mole of a substance (water). We can use it as a ratio or fraction.
[tex]\frac{6.022 *10^{23} \ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
Now, we can multiply this fraction by the moles of water (8.54) given.
[tex]8.54 \ mol \ H_2O*\frac{6.022 *10^{23}\ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
When we multiply, the moles of water will cancel out.
[tex]8.54 *\frac{6.022 \ molecules \ H_2O}{1 \ }[/tex]
Since the fraction has a 1 as a denominator, we can remove it. The problem will be a simple multiplication problem.
[tex]8.54*6.022 \ molecules \ H_2O[/tex]
[tex]5.142788*10^{24} \ molecules \ H_2O[/tex]
The original measurement of 8.54 has 3 significant figures (8, 5, and 4). Therefore, we must round our answer to 3 sig figs, which is the hundredth place in this case.
The 2 in the thousandth place tells us to leave the 4 in the hundredth place.
[tex]5.14 *10^{24} \ molecules \ H_2 O[/tex]
There are about 5.14*10²⁴ molecules of water in 8.54 moles.
Answer:
5.14 x 10^24 molecules of H2O.
Explanation:
just took the test
what's the molar mass of Li3p
Answer:
51.79g Li₃P.
Explanation:
Li has a molar mass of 6.94 g (since there are 3, you multiply it 3 times) and P has a molar mass of 30.97 g. 6.94(3) + 30.97 = 51.79g.
separation methods for coconut oil and water
Answer:
[tex]\huge\mathtt{{\colorbox{silver}{ANSWER~~~↴}}}[/tex]
we use a separating funnel to separate oil from water , we are using funnel because both water and oil both are immiscible liquids.
the process of separation of oil from water is called filtration ✔️
no copied answer :)
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An object has a density of 1.4 g/cm . It is slowly lowered into a graduated cylinder whose water level was 65 mL. When the object is completely submerged the water level rises to 90 mL. What is the mass of the object?
Answer:
Explanation:
Weight
A measure of the force of gravity on an object
Mass
The measurement of how much matter an object contains
Volume
The amount of space that matter occupies
Density
The physical property that relates the mass and volume of an object or material
Unlike weight, mass doesn't change with location, even when the force of gravity on an object changes
Why do scientists prefer to describe its matter by its mass rather than its weight?
International System of Units
What system of units do scientists use to measure the properties of matter?
Liter, milliliter, cubic centimeter
3 common units of volume
Volume= length•width•height
Volume formula
Sand and feathers have different densities
Why does a kg of sand take up much less space than a kg of feathers?
Density=mass/volume
Density formula
Objects with densities greater than water will sink and objects with densities less than water will float. The density of wood is less than water (1 g/cm3) and the density of iron is greater than water (1 g/cm3)
If you drop a block of iron and block of wood into water, the iron sinks and the wood floats. What can you conclude about the density of iron and wood compared to the density of water?
V=2,400 cm3
A box has a length of 25 cm, a width of 8 cm, and a height of 12 cm. What is its volume?
D= 13.5 g/cm3
A sample of metal has a mass of 94.5 g and a volume of 7 cm3. What is its density?
Mass= density•volume
Mass formula
M= 234.26 g
Corn oil has a density of 6.89 g/cm3. What is the mass of 34.0 cm3 of corn oil?
Yes. No. The pull of gravity is different on the moon.
A solid has a mass of 180. Would the solid have a mass of 180 g on the moon? Would it have the same weight on Earth as on the moon? Explain.
No, because only the mass and volume will change
Will every solid with the same dimensions have the same density?
Grams and kilograms
Common units for mass
Grams per cubic centimeter or grams per cubic milliliter
Common units for density
V= 20 ml
D= 0.75 g/cm3
George put 25 ml of water into a graduated cylinder. After adding a solid object, the water level in the cylinder rose to 45 ml. What is the volume of the object? The object George is examining has a mass of 15 grams. What is the density of the object?
What is the name given to the group 0 elements
Answer:
the noble gases
Chemical Equations :p
Explanation:
4NH₃ (g) + 5O₂ (g) → 4NO (g) + 6H₂O (g) Ba(ClO₃)₂ (s) → BaCl₂ (s) + 3O₂ (g) 2Al (s) + 3Zn(NO₃)₂ (aq.) → 3Zn (s) + 2Al(NO₃)₃ (aq.) 2C₈H₁₈ (g) + 25O₂ (g) → 16CO₂ (g) + 18H₂O (g)Consider the balanced chemical
reaction below. When the reaction was
carried out, the calculated theoretical
yield for iron was 365 grams, but the
measured yield was 278 grams. What
is the percent yield?
Fe2O3 + 3C0 2Fe + 3C02
Explanation:
Percentage yield = (278/365) * 100% = 76.16%.
Answer:
[tex]\boxed {\boxed {\sf 76.2 \% }}[/tex]
Explanation:
A percent yield helps measure how successful or precise a reaction was. It is ratio of measured yield to theoretical yield as a percent. The formula is:
[tex]percent \ yield=\frac{actual \ yield}{theoretical \ yield } *100[/tex]
For this reaction, the measured/actual yield was 278 grams, while the theoretical yield was 365 grams.
[tex]actual = 278 \ g \\\theoretical= 365 \ g[/tex]
Substitute the values into the formula.
[tex]percent \ yield =\frac{278 \ g}{365 \ g} *100[/tex]
Divide first. The grams (g) will cancel out.
278 g/365 g= 278/365=0.7616438356[tex]percent \ yield =0.76164383561*100[/tex]
Multiply.
[tex]percent \ yield=76.1643835616[/tex]
The original measurements both had 3 significant figures, so we should round our percent yield to 3 sig figs. In this case, that is the tenths place.
The 6 in the tenth place tells us to round the 1 up to a 2.
[tex]percent \ yield \approx 76.2[/tex]
The percent yield is about 76.2 %
The atmospheric gases in the thermoaphere are heated___.
Answer:
Directly by the sun
I was named after the man that developed the periodic table.
Einsteinium
Moscovium
Mendelevium
Lawrencium
Answer: Mendelevium
Explanation:
An element in group 3 that is a good conductor of electricity.
Answer:
Well for me I think
Explanation:
it's Aliminium
Answer:
Aluminum is good in heat and conductor
PLEASE HELP !!
Use the diagram below to answer the following questions.
PLEASE HELP
E TE
Figure B
In Figure B, which region contains the noble gas family of elements?
ОА
OD
ОС
OB
Noble gas located in the region D
Further explanationNoble gas are located in group 18 in the periodic table consisting of helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), have a stable electron configuration where the valence electrons are 8(full outer shell of electrons), so it is very hard to react because of its stability
If we look at the periodic system of the elements, the noble gases are on the far right, so that in Figure 8 it is located in area D
And the other region :
A : alkali elements(group 1),
B : alkaline earth elements(group 2)
C : halogen elements(group 17)
Genetics is the study of
The speed of light is 300,000,000 m/s. What is the frequency of microwaves with a wavelength of 0.01 meter?
Answer:
30,000,000,000 Hz
Explanation:
I searched it up and got 3 x 10^10 and thats 30000000000
ANSWER ASAP please I need help thank you I’ll give you brainly
What is the standard cell notation of a galvanic cell made with silver (Ag) and
nickel (Ni)?
A. Ni2+(aq) | Ni(s) || Ag(s) | Ag+(aq)
B. Agt(aq) | Ag(s) || Ni(s) | Ni2+(aq)
C. Ag(s) | Ag+(aq) || Ni2+(aq) | Ni(s)
D. Ni(s) | Ni2+(aq) || Ag+(aq) | Ag(s)
Answer:
See the attached notation!
Liam observed that the pyrite looks like metal. what property did the student investigate?
Answer:
The correct answer is - Luster.
Explanation:
Luster is a property that explains how the light is reflected on the surface of a mineral. Luster can be categorized with the help of if an element or mineral is metallic or non-metallic.
Pyrite has a shiny, opaque metallic luster which is similar to other metals. There are different types of luster other than metallic also found like, silky, dusty, pearly, waxy, and a few more.
The units of a formula mass are
a. amu
b. micrograms
c. moles
d. grams
Answer:
the units of a formula mass are amu.
what is ideal gas constant?? g0ogle doesnt got any good answerss
Answer:
An ideal gas is a gas with particular characteristics.
Explanation:
The particles have no volume All collisions between particles are elastic collisions and lose no kinetic energy The particles neither attract each other nor repel They have random movementIdeal gases are hypothetical which means that they do not exist in their true form.
hope this helps, pls mark brainliest :D
Do I use molar mass when the problem gives me grams? (Yes or No), Right answer gets brainliest.
(Stoichiometry Review)
Answer:
yes
Explanation:
yes because the molar mass is an intensive property of the substance, that does not depend on the size of the sample. In the International System of Units (SI), the base unit of molar mass is kg/mol. However, for historical reasons, molar masses are almost always expressed in g/mol.
Answer:
Yes, if your calculating from grams to moles.
If you leave your home at noon, and the speed limit is 50 km/h on the highway, what is the approximate time will you get to Atlantic City if Atlantic City is 150 km away? (obeying the speed limit of course)
Answer:
The time you will get to Atlantic City is 3 pm
Explanation:
Given;
speed limit, v = 50 km/h
distance to be traveled, d = 150km
The time of the motion is given as;
time = distance / speed
t = (150 km) / (50 km/h)
t = 3 hours
Thus, if you leave your home at noon, the time you will get to Atlantic City is given as;
time to get home = 12 pm + 3hours = 3 pm
Therefore, the time you will get to Atlantic City is 3 pm
In this reaction, how does the rate of forward reaction vary with the concentration of the product?
2H2S(g) ⇌ 2H2(g) + S2(g)
It increases with an increase in the concentration of S2(g).
It decreases with a decrease in the concentration of H2(g).
It increases with a decrease in the concentration of H2(g).
It decreases with an increase in the concentration of S2(g).
It decreases with increase in the concentration of H2(g).
Answer:
c d e
Explanation:
Answer:
C D E
Explanation:
#platogang
What caused space technology to improve so quickly?
Answer:
“spinoff”
Explanation:
Here is just a sampling of the many “spinoff” technologies, as NASA refers to them, resulting from space research and development that we now use in everyday life.
serup is which solution
Answer:
dilute solution . . . . . . .
Explanation:
. .
Answer:
dilute soloution
Explanation:
dilute soloution as it dissolves
What is the atomic number of this element?
Answer:
27
Explanation:
Please help me choose the correct statement