Please help me iv'e been stuck on it for 5 hours and it's science please help me and this better be worth it because i haven't been on brainly and i don't have much points rn so can someone please help me thank you

Answer:

665

Explanatio

Answer:

$665

Explanation:

5 hours per week × $7 per hour = $35 per week

$35 per week × 19 weeks = $665

The __ increases by 1 as you go left to right across the periodic table.

A. Atomic mass

B. Atomic number

C. Number of neutrons

D. Number of ions

Answer C

Answer:

van Leeuwenhoek called the organisms he saw in his microscope "animalcules." also he shined light on specimen so that he could see the right cells

Answer:

The correct answer would be C

Explanation:

Plz correct me if wrong

The condition in which sugar is most likely to dissolve fastest in a cup of water is when sugar crystals with stirring at 15°C. Therefore, option C is correct.

Dissolution is the process by which a solute dissolves in a solvent to form a homogeneous mixture called a solution. The conditions required for dissolution are:

Thus, option C is correct.

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Answer:

I'm posting this so I can tell all of you that we should help him together in the comments because it seems we need more than one person to help him

Answer:

There are 2 answers.  A and C

Explanation:

Si is Silicon, which is a metalloid,

Br2 is Bromine, which is a metalloid

Answer: two unpaired

Explanation: In general, electrons are removed from the valence-shell s-orbitals before they are removed from valence d-orbitals when transition metals are ionized. And thus, V3+ is paramagnetic, because it has two unpaired 3d-electrons.

Answer:

krypton

bromine

selenium

Answer:

Q = 1672.84 j

c = 0.898 J/g.°C

Explanation:

1) Given data:

Mass of water = 23.0 g

Initial temperature = 25.4°C

Final temperature = 42.8° C

Heat absorbed = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Specific heat capacity of water is 4.18 J/g°C

ΔT = 42.8°C - 25.4°C

ΔT = 17.4°C

Q = 23.0 g ×  × 4.18 J/g°C × 17.4°C

Q = 1672.84 j

2) Given data:

Mass of metal = 120.7 g

Initial temperature = 90.5°C

Final temperature = 25.7 ° C

Heat released = 7020 J

Specific heat capacity of metal = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 25.7°C - 90.5°C

ΔT = -64.8°C

7020 J = 120.7 g ×  c ×  -64.8°C  (Negative sign shows heat is released)

7020 J = 7821.36 g.°C ×  c

c = 7020 J / 7821.36 g.°C

c = 0.898 J/g.°C

Answer:

A. Alkaline Metals

Explanation:

I majored in Chemistry

Moles of gas : 0.414

Given

V =29.90 liters,

P = 336.99 mmHg = 0,443 atm

T = 390K

Required

moles

Solution

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm , N/m²

V = volume, liter  

n = number of moles  

R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m2, v= m³)

T = temperature, Kelvin  

Input the equation

n = PV/RT

n = 0.443.29.9/0.082.390

n= 0.414 moles

Answer: KL

Explanation:

The side of Figure T' that is congruent to side 1 of Figure S using relevant transformations is; KL.

When rotating a shape 90° clockwise, it is expressed as;(x, y) → (y, -x).

When reflecting the image over the y-axis, it is expressed as (x, y) → (-x, y).

Carrying out the two transformations would mean that we are reflecting a shape over the y = -x line, where;

(x, y) → (-y, -x).

Thus, the side of Figure T' that is congruent to side 1 of Figure S is KL.

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Questions aren't clear, if u need assistance let me know .. I'm in year11 I can help out.

Answer:

+1

Explanation:

A Potassium atom is represented with the sign "K" in chemistry and have atomic number 19.

The charge of electrons causes a matter to experience a force and it can be positive or negative.

In Potassium atom, the electric charge is +1 to enter a stable electron configuration as there is only one valence electron in the outermost shell of potassium atom. As potassium atom will lose electron it will become positively charged.

Hence, the correct answer is "+1".

Answer:

Explanation:

the answer is higher because there is more exercise that makes it higher

hope this helps

Answer:

single displacement reaction

Explanation:

it is because an atom(Pb) dispalces another atom(H) in H3PI4

The given chemical reaction is single displacement reaction.

When one element in a molecule gets replaced by another, is therefore called a single displacement reaction.

The given reaction is Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2

It can be seen that when lead is treated with H3PO4 then it will give Pb3(PO4)2 and hydrogen reaction. It is a kind of single displacement reaction.

Therefore, the given reaction is single displacement reaction.

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Answer:

haha

Explanation:

yea because my phat a22 is to lazy

Answer:

true and b are the answers I think

Answer:

true/precipitation

Explanation:

Answer:

The heliosphere is the vast, bubble-like region of space that surrounds and is created by the Sun.

To solve this we must be knowing each and every concept related to  standard deviation. Therefore, 30.3 is the standard deviation of this data set. The correct option is option C.

In descriptive statistics, the standard deviation measures how widely the data points vary from the mean. It describes how values are distributed throughout the information sample and calculates how widely apart data points are from the mean.

Mathematically,

73+70+80+12+98+27 =360

mean of observations = 360/6=60

deviations from the mean

(73−60), (70−60), (80−60), (12−60), (98−60),  (27 −60)=13, 10, 20, -48, 38, -33

standard deviation (σ) formula can be given as

σ=√(13)²+(10)²+(20)²+(-48)²+(38)²+(-33)²/6

On calculations, we get:

σ=30.3

Therefore, 30.3  is the standard deviation of this data set. The correct option is option C.

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Answer:

Mg2+

Explanation:

The most reactive ions from the given choices is the magnesium ion. This is because it is higher in the activity series of metals.

Zinc ion is below this specie in the activity series.

As a rule, ions above another on the activity series are generally more reactive than those below.

From any solution, magnesium ion will displace the zinc ion in such process.

The position of metallic ions determines their reactivity.

Answer:

194

Explanation:

Step by step I just took the test

Answer:

a number which occurs in the theoretical expression for the value of some quantized property of a subatomic particle, atom, or molecule and can only have certain integral or half-integral values.

Explanation:

In other words, it is a number that is Part of scientific theories or chemistry

Answer:

22.4

Explanation: