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2 years ago

In a motion diagram the size of the object must be less than the distance moved t or f

Chemistry

2 answers:

KATRIN_1 [288]2 years ago

6 0

The awnser is false.

UNO [17]2 years ago

5 0

False is the answer.

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If a flame is yellow is it considered dirty or clean?And to make it blue do you add or take away air?

Step2247 [10]

It is clean and is blue when you take away air hope i helped.

8 0

2 years ago

How do you identify a mineral there are six things

LenKa [72]

A good example is the mineral plagioclase. Plagioclase is a member of the feldspar group, but there is more than one type of plagioclase.

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3 years ago

The diagram illustrates the water cycle.

MissTica

Answer:

Precipitation

Explanation:

In the water cycle, water experiences different phase changes from one state to another in nature.

The cycling affords water to in solid, liquid and the vapor form.

From the cycle show, W represents precipitation.

During precipitation, water in the atmosphere begins to fall.
U is evaporation
X is transpiration.
V is the condensation.

3 0

2 years ago

Read 2 more answers

A scientist measures the standard enthalpy change for the following reaction to be -17.2 kJ : Ca(OH)2(aq) 2 HCl(aq)CaCl2(s)

elixir [45]

Answer: $\Delta H^{0}=-173.72$ kJ/mol

Explanation: Enthalpy Change is the amount of energy in a reaction - absorption or release - at a constant pressure. So, Standard Enthalpy of Formation is how much energy is necessary to form a substance.

The standard enthalpy of formation of HCl is calculated as:

$\Delta ^{0}=\Sigma H_{products}-\Sigma H_{reactants}$

$Ca(OH)_{2}_{(aq)}+2HCl_{(aq)}$ → $CaCl_{2}_{(s)}+2H_{2}O_{(l)}$

Standard Enthalpy of formation for the other compounds are:

Calcium Hydroxide: $\Delta H^{0}=$ -1002.82 kJ/mol

Calcium chloride: $\Delta H^{0}=$ -795.8 kJ/mol

Water: $\Delta H^{0}=$ -285.83 kJ/mol

Enthalpy is given per mol, which means we have to multiply by the mols in the balanced equation.

Calculating:

$-17.2=[-795.8+2(285.85)]-[-1002.82+2\Delta H]$

$-17.2=-1367.46+1002.82-2\Delta H$

$2\Delta H=17.2-364.64$

$\Delta H=-173.72$

So, the standard enthalpy of formation of HCl is -173.72 kJ/mol

8 0

2 years ago

What ALWAYS occurs simultaneously with reduction?

Lena [83]

Answer:

Oxidation occurs simultaneously with reduction.

4 0

2 years ago

Read 2 more answers